Sample records for yacoraite formation northwestern

  1. Carbon and oxygen isotopes of Maastrichtian–Danian shallow marine carbonates: Yacoraite Formation, northwestern Argentina

    Microsoft Academic Search

    Rosa Marquillas; Ignacio Sabino; Alcides Nobrega Sial; Cecilia del Papa; Valderez Ferreira; Stephen Matthews

    2007-01-01

    The Maastrichtian–Danian limestones of the Yacoraite Formation (northwestern Argentina) show carbon and oxygen isotopic values consistent with shallow marine conditions. The members of the formation respond to different sedimentary environments and are characterised by distinctive stable isotopes and geochemistry. The basal Amblayo Member is composed of high-energy dolomitic limestones and limestones with positive isotopic values (+2‰ ?13C, +2‰ ?18O). The

  2. A diminutive pelecinid wasp from the Eocene Kishenehn Formation of northwestern Montana (Hymenoptera: Pelecinidae)

    E-print Network

    Greenwalt, Dale; Engel, Michael S.

    2014-07-01

    A new genus and species of pelecinid wasp (Proctotrupoidea: Pelecinidae) is described and figured from a single male preserved in oil shale from the middle Eocene Kishenehn Formation of northwestern Montana. Phasmatopelecinus leonae Greenwalt...

  3. Geological context, mineralization, and timing of the Juramento sediment-hosted stratiform copper-silver deposit, Salta district, northwestern Argentina

    NASA Astrophysics Data System (ADS)

    Durieux, C. Gustavo; Brown, Alex C.

    2007-11-01

    The Juramento deposit in northwestern Argentina exhibits several readily visible general characteristics of sediment-hosted stratiform copper (SSC) mineralization. It consists of fine-grained disseminated base-metal sulfides within marine to lacustrine graybeds (the basal whitish Late Cretaceous Lecho Sandstone and shallow-water carbonates of the overlying Maastrichtian Yacoraite Formation) that overlie a thick sequence of redbeds (the Pirgua Subgroup). The property has been examined and drilled in three successive exploration programs as a possible analog of world-class mineralization in the copperbelts of central Africa and the Kupferschiefer. The present report provides specific field and laboratory results that confirm the classification as SSC-type mineralization. The host graybeds are the basal sandstone and overlying oolitic and stromatolitic units of the Yacoraite Formation, which are shown from textural studies to be carbonaceous and to have initially contained very fine-grained, disseminated, syndiagenetic pyrite. These sediments would have been sufficiently porous and permeable in early diagenetic time to allow an infiltration of metalliferous fluids from the underlying redbeds, resulting in the observed progressive replacement of in situ pyrite by common base-metal sulfides (sphalerite, galena, argentiferous tetrahedrite, and copper-rich sulfides: first chalcopyrite, then bornite, and finally chalcocite). Sulfur isotope analyses indicate that a portion of the sulfur of ore-stage sulfides is isotopically heavier than that of pyrite, possibly due to a contribution from associated gypsum. Ore-stage sulfides are zoned vertically and obliquely through the mineralized zones, from cupriferous sulfides at low stratigraphic levels to lead- and zinc-rich mineralization above, with unreplaced pyrite remaining within upper Yacoraite strata. The zoned sulfides and their replacement textures, the peneconformable configuration of the mineralized zones, and the position of ore-stage mineralization adjacent to a stratigraphically defined redox transition from redbeds upward into graybeds indicate an overprint of copper (and accompanying ore-stage metals) on originally pyritic graybeds. The influx of ore-stage metals, presumably in an oxidized low-temperature brine, terminated with a silicification event that effectively sealed the host carbonates. These observations and the overall genetic interpretation are consistent with the general deposit-scale genetic model for early diagenetic SSC mineralization. The regional geologic context is also consistent with its classification as a SSC deposit: It is hosted by post-oxyatmoversion sediments and was formed in association with evaporites at a low paleolatitude in a major intracontinental rift system.

  4. Airfall tuff in the Browns Park Formation, northwestern Colorado and northeastern Utah.

    USGS Publications Warehouse

    Luft, S.J.

    1985-01-01

    Bedded airfall tuffs, mainly rhyolitic in composition and locally very thick, occur throughout the Browns Park Formation (upper Oligocene to upper Miocene) in northwestern Colorado and northeasternmost Utah. They have received only cursory attention other than for the purpose of radiometric dating. The present writer began study of the tuffs in 1980, hoping to use them as time-stratigraphic marker beds within the formation. Several tuff-rich stratigraphic sections were measured and numerous samples were collected. The results of petrographic and petrochemical studies of these samples are presented. -from Author

  5. Facies and Architecture of a Carboniferous Grounding-line System From the Guandacol Formation, Paganzo Basin, Northwestern Argentina

    Microsoft Academic Search

    S. A. Marenssi; A. Tripaldi; C. O. Limarino; A. T. Caselli

    2005-01-01

    New outcrops of Middle Carboniferous glacigenic deposits found in the Guandacol Formation (western Paganzo Basin) are described in this paper. The study locality of Los Pozuelos Creek (northwestern Argentina) includes coarse-grained diamictites, rhythmites, laminated pebbly mudstones and shales that represent an expanded column of the Gondwanic glaciation in this region. Thirteen lithofacies recorded at the measured section have been grouped

  6. Detrital Zircon Provenance of Neoproterozoic and Cambrian Neruokpuk Formation of northwestern Canada: Implications for Phanerozoic Arctic Evolution

    NASA Astrophysics Data System (ADS)

    Lane, L.; Gehrels, G. E.; Layer, P. W.

    2012-12-01

    Neoproterozoic and Cambrian strata of northwestern Canada are characterized as being derived predominantly from one or more of three principal sources. The sources comprise cratonic rocks of Paleoproterozoic and Archean ages; early Neoproterozoic Mackenzie Mountains Supergroup clastic strata; and Mesoproterozoic Wernecke Supergroup clastic strata, which are widely preserved in the northern Canadian Cordillera. The Neruokpuk Formation is a Late Neoproterozoic and Early Cambrian turbiditic succession located adjacent to the Yukon Stable Block in northwestern Yukon and adjacent northeastern Alaska. The dominant lithology is quartz to quartz-lithic sandstone, locally containing altered detrital feldspar and muscovite indicating contributions from a metamorphic source. The unit forms part of a Neoproterozoic to Early Devonian slope and basin succession that can be correlated in detail to coeval strata in the Selwyn Basin of the northern Canadian Cordillera. However, the Devonian structural and magmatic record for the unit associates it more closely with the Arctic Alaska terrane to the west and to northern Ellesmere Island, some 2000 km to the northeast, than to its present position in northwestern Laurentia. To test whether the Neruokpuk Formation is autochthonous relative to northwestern Laurentia, samples of sandstone from both the Proterozoic lower part and the Cambrian upper part of the unit were processed for detrital zircon analyses. These results were compared to previously published results from the Cambrian of northwestern Canada, as well as to newly analysed Late Neoproterozoic and Cambrian control samples that are known to be autochthonous. Neruokpuk Formation zircons are dominated by 1800-2000 Ma grains with subsidiary populations of 1000-1600 Ma, 2300-2500 Ma and 2600-2900 Ma, consistent with a mixed provenance strongly dominated by a Laurentian cratonic source, with minor contributions from Mackenzie Mountains Supergroup (which is dominated by 1000-1700 Ma populations) and Wernecke Supergroup. In addition, detrital muscovite yielded disturbed Ar-Ar spectra of 1800-1900 Ma, consistent with the most dominant zircon population. Detrital zircon distributions dominated by north Laurentian cratonic populations are widespread along the Arctic margin as far afield as northeastern Greenland. After integrating stratigraphic, biostratigraphic, structural, petrographic and geochronologic data, we infer that the Neruokpuk Formation was most likely deposited more or less in its present location relative to the Laurentian craton. Thus the northeasternmost part of Arctic Alaska probably is not far-travelled. The same conclusion cannot be assumed for other parts of Arctic Alaska which may comprise several individual terranes, some of which may be far-travelled, that assembled prior to Late Devonian time.

  7. Sedimentology and depositional environments of Lower Permian Yeso Formation in northwestern New Mexico

    SciTech Connect

    Stanesco, J.D. (Geological Survey, Denver, CO (USA))

    1989-09-01

    The northwesternmost exposures of the Lower Permian (Leonardian) Yeso Formation are in uplifts that bound the southern half of the San Juan basin in northwestern New Mexico. The Yeso comprises the Meseta Blanca member and overlying San Ysidro Member. The latter is called the Los Vallos Member in the southern part of the study area. The Meseta Blanca consists of cross-stratified and horizontal to wavy-bedded sandstones of eolian-dune, sand-sheet, and sabkha origin. These facies also occur in the San Ysidro (Los Vallos), which additionally includes mud-draped, ripple-laminated sandstones of supratidal mud-flat origin, gypsiferous sandstones and siltstones of sabkha origin, and evaporite-carbonate rocks of intertidal to marine-shelf origin. Paleocurrent analysis indicates that eolian dunes in the Meseta Blanca migrated southward in the northern part of the study area. These dunes may have been extensions of the DeChelly Sandstone erg to the northwest. Dunes in the southern part of the study area shifted under variable north-south winds. This variability may reflect a seasonal onshore/offshore wind regime. Lateral facies changes in the San Ysidro (Los Vallos) indicate a juxtaposition of eolian-dune and sand-dominated sabkha environments in the northern part of the study area, with coastal-sabkha, tidal, and shelf environments in the southern part. Eolian dunes prograded southward over coastal sabkhas at least 12 times during deposition of the Yeso. A northward shift of all facies during middle San Ysidro deposition suggests a marine transgression from the south.

  8. Clay mineral assemblages and analcime formation in a Palaeogene fluvial lacustrine sequence (Maíz Gordo Formation Palaeogen) from northwestern Argentina

    NASA Astrophysics Data System (ADS)

    Do Campo, M.; del Papa, C.; Jiménez-Millán, J.; Nieto, F.

    2007-09-01

    The Palaeogene Maíz Gordo Formation is one of the main lacustrine events recorded in northwestern Argentina. It consists of sandstone, mudstone, and limestone beds 200 m thick, deposited in a brackish-alkaline lake and braided alluvial systems. The Maíz Gordo Lake evolved mainly as a closed system, with brief periods as an open one. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study samples from seven sites, corresponding respectively to proximal, intermediate, and transitional positions of the fluvial environment and marginal and inner-lake environment, focusing on the clay mineralogy and analcime formation. The basinward zonation of diagenetic minerals identified in the Maíz Gordo Lake was: mordenite ? analcime ? K-feldspar. Although not a typical zonation of saline-alkaline lakes, it does indicate an increase in salinity and alkalinity towards the centre. In proximal fluvial settings, smectite predominates at the base of the sequence, with scarce kaolinite. Towards the top, a striking increase in kaolinite content suggests a change from a relatively arid climate with alternating humid and dry seasons, towards a warm and humid climate. Kaolinite content clearly decreases in a basinward direction. Such a variation is attributable to changes in hydro-geochemistry, denoting the progressive influence of the brackish and alkaline lake water on interstitial pores. SEM images of intermediate fluvial samples reveal authigenesis of illite at the expense of kaolinite booklets. In littoral and inner-lake settings the clay fraction is composed of muscovite, sometimes with subordinate smectite. Analcime occurs in variable amounts in all sedimentary facies, in rock pores or filling veins. It forms subhedral square to hexagonal, or anhedral rounded crystals, denoting that they coarsened at low to moderate degrees of supersaturation. Although the mordenite identified in a fluvial level would have been the precursor of analcime in the Maíz Gordo Basin, no textural evidence of analcime formation through replacement of mordenite or other precursor zeolite was found. Hence it is more probable that analcime formation took place by direct authigenic precipitation or through the reaction between interstitial brines and clay minerals or plagioclase.

  9. Significance of the goniatite Bilinguites eliasi and associated biotas, Parkwood Formation and Bangor Limestone, northwestern Alabama ( USA).

    USGS Publications Warehouse

    Henry, T.W.; Gordon, M., Jr.; Schweinfurth, S.P.; Gillespie, W.H.

    1985-01-01

    The Bangor Limestone contains conodonts, smaller calcareous foraminifers, and a sparse marine macrofauna dating it as late or latest Chesterian (Late Mississippian). The Parkwood Formation, a paralic sequence disconformably overlying the Bangor, has yielded a fauna containing the reticuloceratid ammonoid Bilinguites eliasi Manger and Saunders which permits correlation of the Parkwood Formation in north-western Alabama to the upper part of the Prairie Grove Member of the Hale Formation in the type Morrowan sequence. The macrofauna occurring with the ammonoid, supports this correlation. Bilinguites eliasi also alows correlation with the lower part of the Yeadonian Stage (lowest Namurian 'C') of Europe. Florules collected just below and above the goniatite occurrence in Frankling County correlate with those in the lower two-thirds of the New River Formation, southern West Virgina, and with the upper Namurian of western Europe. -from Authors

  10. Makah Formation; a deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington

    USGS Publications Warehouse

    Snavely, Parke Detweiler; Niem, A.R.; MacLeod, N.S.; Pearl, J.E.; Rau, W.W.

    1980-01-01

    The Makah Formation of the Twin River Group crops out in a northwest-trending linear belt in the northwesternmost part of the Olympic Peninsula, Wash. This marine sequence consists of 2800 meters of predominantly thin-bedded siltstone and sandstone that encloses six distinctive newly named members--four thick-bedded amalgamated turbidite sandstone members, an olistostromal shallow-water marine sandstone and conglomerate member, and a thin-bedded water-laid tuff member. A local unconformity of submarine origin occurs within the lower part of the Makah Formation except in the central part of the study area, where it forms the contact between the older Hoko River Formation and the Makah. Foraminiferal faunas indicate that the Makah Formation ranges in age from late Eocene (late Narizian) to late Oligocene (Zemorrian) and was deposited in a predominantly lower to middle bathyal environment. The Makah Formation is part of a deep-marginalbasin facies that crops out in the western part of the Olympic Peninsula, in southwesternmost Washington and coastal embayments in northwestern Oregon, and along the central part of the coast of western Vancouver Island. On the basis of limited subsurface data from exploratory wells, correlative deep-marginal-basin deposits underlie the inner continental shelf of Oregon and the continental shelf (Tofino basin) along the southwestern side of Vancouver Island. Directional structures in the Makah Formation indicate that the predominantly lithic arkosic sandstone that forms the turbidite packets was derived from the northwest. A possible source of the clastic material is the dioritic, granitic, and volcanic terranes in the vicinity of the Hesquiat Peninsula and Barkley Sound on the west coast of Vancouver Island. Vertical and lateral variations of turbidite facies suggest that the four packets of sandstone were formed as depositional lobes on an outer submarine fan. The thin-bedded strata between the turbidite packets have characteristics of basin-plain and outer-fan fringe deposits.

  11. Variations in vitrinite reflectance values for the Upper Cretaceous Mesaverde Formation, southeastern Piceance basin, northwestern Colorado

    SciTech Connect

    Nuccio, V.F.; Johnson, R.C.; Johnson, S.Y.

    1989-01-01

    The authors discuss how most of the Upper Cretaceous Mesaverde Formation in the southeastern Piceance basin is thermally mature enough to have produced hydrocarbons by thermal generation, but only part of the Mesaverde is thermally mature enough to have expelled significant amounts of natural gas. The Early Permian( ) Fryingpan Member of the Maroon Formation consists of quartz-rich, very fine to fine-grained sandstone deposited in eolian dune and interdune environments. The Fryingpan Member (formerly called the sandstone of the Fryingpan River) is removed from the State Bridge Formation and assigned to the Maroon Formation.

  12. Kizilcaören ore-bearing complex with carbonatites (northwestern Anatolia, Turkey): Formation time and mineralogy of rocks

    NASA Astrophysics Data System (ADS)

    Nikiforov, A. V.; Öztürk, H.; Altuncu, S.; Lebedev, V. A.

    2014-02-01

    The results of isotope-geochronological and mineralogical studies of the rocks making up the Kizilcaören fluorite-barite-REE deposit, northwestern Anatolia, Turkey are discussed in the paper. The ore is a constituent of the subvolcanic complex localized in a large fault zone. The complex combines (from earlier to later rocks): (1) phonolite and trachyte stocks, (2) carbonatite and carbonate-silicate dikelike bodies; and (3) fluorite-barite-bastnaesite ore in the form of thick homogeneous veins and cement in breccia. The K-Ar dating of silicate igneous rocks and carbonatites shows that they were formed in the Chattian Age of the Oligocene 25-24 Ma ago. Mineralogical observations show that the ore is the youngest constituent in the rock complex. Supergene alteration deeply transformed ore-bearing rocks, in particular, resulting in leaching of primary minerals, presumably Ca-Mn-Fe carbonates, and in cementation of the residual bastnaesitefluorite framework by Fe and Mn hydroxides. Most of the studied rocks contain pyrochlore, LREE fluorocarbonates, Nb-bearing rutile, Fe-Mg micas, and K-feldspar. The genetic features of the deposit have been considered. In general, the ore-bearing rock complex is compared in the set of rocks and their mineralogy and geochemistry with deposits of the Gallinas Mountains in the United States, the Arshan and Khalyuta deposits in the western Transbaikalia region, and Mushugai-Khuduk deposit in Mongolia. The Kizilcaören deposit represents a variant of postmagmatic mineralization closely related to carbonatite magmatism associated with alkaline and subalkaline intermediate rocks.

  13. NORTHWESTERN UNIVERSITY Pattern Formation in Two-Frequency Forced Faraday Waves

    E-print Network

    Topaz, Chad M.

    OF PHILOSOPHY Field of Applied Mathematics By Chad Michael Topaz EVANSTON, ILLINOIS December 2002 #12;ABSTRACT Pattern Formation in Two-Frequency Forced Faraday Waves Chad Michael Topaz This dissertation investigates

  14. Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina.

    PubMed

    Trotteyn, M Jimena; Ezcurra, Martín D

    2014-01-01

    Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is "Chanaresuchus ischigualastensis", based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered 'Chanaresuchus ischigualastensis' as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, "Chanaresuchus ischigualastensis" can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for 'Chanaresuchus ischigualastensis', which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids. PMID:25426846

  15. Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the Early Late Triassic Ischigualasto Formation of Northwestern Argentina

    PubMed Central

    Trotteyn, M. Jimena; Ezcurra, Martín D.

    2014-01-01

    Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is “Chanaresuchus ischigualastensis”, based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered ‘Chanaresuchus ischigualastensis’ as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, “Chanaresuchus ischigualastensis” can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for ‘Chanaresuchus ischigualastensis’, which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids. PMID:25426846

  16. Sedimentology of the Pliocene Upper Onzole Formation, an inner-trench slope succession in northwestern Ecuador

    Microsoft Academic Search

    K. R Aalto; W Miller

    1999-01-01

    The Pliocene Upper Onzole Formation exposed in the vicinity of Punta Gorda, near Esmeraldas, Ecuador, is composed mainly of fine-grained mud turbidites, having regular vertical sequences of sedimentary structures associated with a positive grading, and bioturbation restricted mostly to the tops of beds. The remainder of beds measured consist of volcanic ash, mud pelagite, and glauconitic silt–sand turbidites. Vertical sequential

  17. Shrubland formations and associations in mediterranean-desert transitional zones of northwestern Baja California

    Microsoft Academic Search

    M. Peinado; F. Alcaraz; J. L. Aguirre; J. Delgadillo; I. Aguado

    1995-01-01

    The area between Ensenada and EI Rosario (Baja California, Mexico) has long been considered as a transitional zone in which two great ecoclimatic regions (Mediterranean and Tropical-Desert) overlap. The floristic and biotypical diversity of this area was evaluated by analyzing its shrubland formations from a phytosociological point of view. This phytosociological study, carried out according to the Braun-Blanquet method and

  18. High-resolution stratigraphic correlations and geochemical analyses, Cretaceous Niobrara formation, northwestern Denver-Julesburg Basin

    SciTech Connect

    Rodriguez, T.E.; Pratt, L.M.

    1985-05-01

    The middle Santonian-lower Campanian part of the Smoky Hill Member of the Niobrara Formation represents a fourth-order regressive-transgressive cyclotherm. Studies of this interval have improved our understanding of the influence of depositional environments and structural setting on distributions of organic matter in epicontinental marine strata. Geochemical analyses of fresh quarried sections at Lyons and LaPorte, Colorado, show that, in general, C/sub org/ (organic carbon) levels are highest between mid-regression and mid-transgression. Rhythmic fluctuations of C/sub carb/ (carbonate carbon) and C/sub org/ correspond to limestone-marlstone bedding couplets at a scale of 15-20 cm (6-8 in.). Pronounced lateral variations between Lyons and LaPorte exist in C/sub org/, HI (pyrolytic hydrogen index), sediment accumulation rates, and T/sub max/ (temperature of maximum pyrolytic yield). Comparisons of geochemical averages at Lyons and LaPorte indicate an elevated thermal maturity at Lyons and depositional conditions more favorable for preservation of marine organic matter at LaPorte. In both sections, C/sub org/ and C/sub carb/ show strong negative correlations, possibly reflecting cyclic climatic controls on the development of bedding couplets. High-resolution stratigraphic correlations of 100.000-year or smaller intervals between Boulder and Owl Canyon, Colorado, based on wide-spread bentonites and bedding couplets, reveal a paleostructural high near Lyons. Shallow-water conditions and increased turbulence over this high are reflected in sediment accumulation rates only 60% of those at LaPorte. Increased amounts and hydrogen richness of organic matter at LaPorte may reflect a deeper water, more quiescent depositional setting.

  19. INNOVATION ENGINES AT NORTHWESTERN

    E-print Network

    Engman, David M.

    INNOVATION ENGINES AT NORTHWESTERN MEDICINE DIVISION OF RHEUMATOLOGY THE INSTITUTES AT NORTHWESTERN, Division of Rheumatology, Northwestern University Feinberg of Medicine Building on advancements in the treatment of inflammatory arthritis, the Division of Rheumatology at Northwestern University Feinberg School

  20. The formation of the northwestern Dniepr-Donets Basin: 2-D forward and reverse syn-rift and post-rift modelling

    NASA Astrophysics Data System (ADS)

    Kusznir, N. J.; Stovba, S. M.; Stephenson, R. A.; Poplavskii, K. N.

    1996-12-01

    Forward and reverse modelling of structure and stratigraphy have been used to investigate the syn-rift (Devonian) and early post-rift (Carboniferous) evolution of the northwestern Dniepr-Donets Basin. Modelling shows that basin formation is consistent with Frasnian-Famennian rifting followed by post-rift subsidence starting in the early Tournaisian. Forward syn-rift modelling, using the flexural cantilever model of rift basin formation, satisfactorily models the observed syn-rift stratigraphic thicknesses and structure within the basin using total syn-rift extension of approximately 15 km in the region studied with a maximum ? stretching factor of 1.3. Forward structural and stratigraphic modelling suggests that the Devonian rifting, which formed the northwestern Dniepr-Donets Basin, was accompanied by regional uplift of the order of 300 m. Both forward and reverse (flexural backstripping) modelling of post-rift stratigraphy through the Carboniferous suggest that post-rift thermal subsidence, which commenced in the Tournaisian following Devonian rifting, was augmented by additional regional subsidence of the order of 300 m in middle Carboniferous times. It is suggested that this transient regional uplift event, which accompanied rifting and decayed in middle Carboniferous times, was generated by a mantle plume.

  1. Lithofacies, age, depositional setting, and geochemistry of the Otuk Formation in the Red Dog District, northwestern Alaska

    USGS Publications Warehouse

    Dumoulin, Julie A.; Burruss, Robert C.; Blome, Charles D.

    2013-01-01

    Complete penetration of the Otuk Formation in a continuous drill core (diamond-drill hole, DDH 927) from the Red Dog District illuminates the facies, age, depositional environment, source rock potential, and isotope stratigraphy of this unit in northwestern Alaska. The section, in the Wolverine Creek plate of the Endicott Mountains Allochthon (EMA), is ~82 meters (m) thick and appears structurally uncomplicated. Bedding dips are generally low and thicknesses recorded are close to true thicknesses. Preliminary synthesis of sedimentologic, paleontologic, and isotopic data suggests that the Otuk succession in DDH 927 is a largely complete, albeit condensed, marine Triassic section in conformable contact with marine Permian and Jurassic strata. The Otuk Formation in DDH 927 gradationally overlies gray siliceous mudstone of the Siksikpuk Formation (Permian, based on regional correlations) and underlies black organic-rich mudstone of the Kingak(?) Shale (Jurassic?, based on regional correlations). The informal shale, chert, and limestone members of the Otuk are recognized in DDH 927, but the Jurassic Blankenship Member is absent. The lower (shale) member consists of 28 m of black to light gray, silty shale with as much as 6.9 weight percent total organic carbon (TOC). Thin limy layers near the base of this member contain bivalve fragments (Claraia sp.?) consistent with an Early Triassic (Griesbachian-early Smithian) age. Gray radiolarian chert dominates the middle member (25 m thick) and yields radiolarians of Middle Triassic (Anisian and Ladinian) and Late Triassic (Carnian-late middle Norian) ages. Black to light gray silty shale, like that in the lower member, forms interbeds that range from a few millimeters to 7 centimeters in thickness through much of the middle member. A distinctive, 2.4-m-thick interval of black shale and calcareous radiolarite ~17 m above the base of the member has as much as 9.8 weight percent TOC, and a 1.9-m-thick interval of limy to cherty mudstone immediately above this contains radiolarians, foraminifers, conodonts, and halobiid bivalve fragments. The upper (limestone) member (29 m thick) is lime mudstone with monotid bivalves and late Norian radiolarians, overlain by gray chert that contains Rhaetian (latest Triassic) radiolarians; Rhaetian strata have not previously been documented in the Otuk. Rare gray to black shale interbeds in the upper member have as much as 3.4 weight percent TOC. At least 35 m of black mudstone overlies the limestone member; these strata lack interbeds of oil shale and chert that are characteristic of the Blankenship, and instead they resemble the Kingak Shale. Vitrinite reflectance values (2.45 and 2.47 percent Ro) from two samples of black shale in the chert member indicate that these rocks reached a high level of thermal maturity within the dry gas window. Regional correlations indicate that lithofacies in the Otuk Formation vary with both structural and geographic position. For example, the shale member of the Otuk in the Wolverine Creek plate includes more limy layers and less barite (as blades, nodules, and lenses) than equivalent strata in the structurally higher Red Dog plate of the EMA, but it has fewer limy layers than the shale member in the EMA ~450 kilometers (km) to the east at Tiglukpuk Creek. The limestone member of the Otuk is thicker in the Wolverine Creek plate than in the Red Dog plate and differs from this member in EMA sections to the east in containing an upper cherty interval that lacks monotids; a similar interval is seen at the top of the Otuk Formation ~125 km to the west (Lisburne Peninsula). Our observations are consistent with the interpretations of previous researchers that Otuk facies become more distal in higher structural positions and that within a given structural level more distal facies occur to the west. Recent paleogeographic reconstructions indicate that the Otuk accumulated at a relatively high paleolatitude with a bivalve fauna typical of the Boreal realm. A suite of ?13Corg (carbon isotopic composition of carbon) data (n=38)

  2. INSTITUTES AT NORTHWESTERN MEDICINE

    E-print Network

    Engman, David M.

    Breast Cancer Survivorship Program offers comprehensive care and management strategies for the uniquTHE CANCER INSTITUTES AT NORTHWESTERN MEDICINE CANCER SURVIVORSHIP INSTITUTE THE INSTITUTES AT NORTHWESTERN MEDICINE #12;THE INSTITUTES AT NORTHWESTERN MEDICINE Today more than ever, cancer survivors

  3. Hydrogeology and quality of ground water in the Boone Formation and Cotter Dolomite in karst terrain of northwestern Boone County, Arkansas

    SciTech Connect

    Leidy, V.A.; Morris, E.E. (Geological Survey, Little Rock, AR (United States))

    1991-01-01

    Shallow groundwater flow systems in karst terrain of northwestern Boone County, Arkansas, are particularly susceptible to contamination. The potential for groundwater contamination probably is greater in the northern one-half of the study area where there are more photolineaments and presumably subsurface fractures. Groundwater samples from 17 springs discharging from the Boone Formation and 17 wells completed in the Cotter Dolomite were analyzed to determine ambient groundwater quality and to document water quality variations. The chemical constituents in groundwater generally did not exceed US Environmental Protection Agency primary or secondary maximum contaminant levels. However, fecal coliform and fecal streptococcus bacteria were detected in most springs and in three wells. One spring, located near an abandoned wood-treatment plant (a designated Superfund site), had maximum iron, manganese, lead, and pentachlorophenol concentration that exceeded US Environmental Protection Agency's primary or secondary maximum contamination levels for drinking water. Water samples collected from selected springs emerging from the Boone Formation exhibited an overall decrease in specific conductance and total alkalinity, calcium, magnesium, sodium, and chloride concentrations and an overall increase in nitrate, fecal coliform, and fecal streptococcus bacteria concentrations 3 to 8 hours after a rainstorm.

  4. Stratigraphic cross section (1) of the upper Devonian Perrysburg and Java formations and their equivalents, Northwestern Pennsylvania

    NASA Astrophysics Data System (ADS)

    Harper, J. A.; Abel, K. D.

    A map of the Java, Perrysburg, Ohio shale and Olentagy shale formations in the Erie, Crawford, Warren, Forest, and Clarion counties of Pennsylvania is presented. The stratigraphic cross section is based on gamma ray logs. Special emphasis is placed on the organic rich, radioactive shales of these formations.

  5. The Kharapeh orogenic gold deposit: Geological, structural, and geochemical controls on epizonal ore formation in West Azerbaijan Province, Northwestern Iran

    USGS Publications Warehouse

    Niroomand, Shojaeddin; Goldfarb, Richard J.; Moore, Farib; Mohajjel, Mohammad; Marsh, Erin E.

    2011-01-01

    The Kharapeh gold deposit is located along the northwestern margin of the Sanandaj–Sirjan Zone (SSZ) in the West Azerbaijan province, Iran. It is an epizonal orogenic gold deposit formed within the deformed zone between central Iran and the Arabian plate during the Cretaceous–Tertiary Zagros orogeny. The deposit area is underlain by Cretaceous schist and marble, as well as altered andesite and dacite dikes. Structural analysis indicates that the rocks underwent tight to isoclinal recumbent folding and were subsequently co-axially refolded to upright open folds during a second deformation. Late- to post-tectonic Cenozoic granites and granodiorites occur northeast of the deposit area. Mineralization mainly is recognized within NW-trending extensional structures as veins and breccia zones. Normal faults, intermediate dikes, and quartz veins, oriented subparallel to the axial surface of the Kharapeh antiform, indicate synchronous extension perpendicular to the fold axis during the second folding event. The gold-bearing quartz veins are >1 km in length and average about 6 m in width; breccia zones are 10–50 m in length and ?1 m in width. Hydrothermal alteration mainly consists of silicification, sulfidation, chloritization, sericitization, and carbonatization. Paragenetic relationships indicate three distinct stages—replacement and silicification, brecciation and fracture filling, and cataclastic brecciation—with the latter two being gold-rich. Fluid inclusion data suggest mineral deposition at temperatures of at least 220–255°C and depths of at least 1.4–1.8 km, from a H2O–CO2±CH4 fluid of relatively high salinity (12–14 wt.% NaCl equiv.), which may reflect metamorphism of passive margin carbonate sequences. Ore fluid ?18O values between about 7? and 9? suggest no significant meteoric water input, despite gold deposition in a relatively shallow epizonal environment. Similarities to other deposits in the SSZ suggest that the deposit formed as part of a diachronous gold event during the middle to late Tertiary throughout the SSZ and during the final stages of the Zagros orogeny. The proximity of Kharapeh to the main tectonic suture of the orogen, well-developed regional fold systems with superimposed complex fracture geometries, and recognition of nearby volcanogenic massive sulfide systems that suggest a region characterized by sulfur- and metal-rich crustal rocks, collectively indicate an area of the SSZ with high favorability for undiscovered gold resources.

  6. Molecular Biophysics AT NORTHWESTERN UNIVERSITY

    E-print Network

    Grzybowski, Bartosz A.

    .nuin.northwestern.edu Materials Science and Engineering www.matsci.northwestern.edu Medical Scientist Training Program www.mstp.northwestern.edu Physics www.physics.northwestern.edu Molecular Biophysics AT NORTHWESTERN UNIVERSITY #12;RESEARCH TOPICS Northwestern's research programs in biophysics explore diverse topics in structural biology, drug design

  7. Lower Cretaceous rebbachisaurid sauropods from Cerro Aguada del León (Lohan Cura Formation), Neuquén Province, northwestern Patagonia, Argentina

    Microsoft Academic Search

    Leonardo Salgado; Alberto Garrido; Sergio E. Cocca; Juan R. Cocca

    2004-01-01

    We describe sauropod material from the Lower Cretaceous (Aptian-Albian) Puesto Quiroga Member of the Lohan Cura Formation, exposed at the Cerro Aguada del León locality (La Picaza area, Neuquén Province, Argentina). The remains consist of disarticulated elements of at least three individuals, and are assigned to an indeterminate species of the rebbachisaurid diplodocoid Limaysaurus gen. nov. Elements from various parts

  8. 3D slicing of radiogenic heat production in Bahariya Formation, Tut oil field, North-Western Desert, Egypt.

    PubMed

    Al-Alfy, I M; Nabih, M A

    2013-03-01

    A 3D block of radiogenic heat production was constructed from the subsurface total gamma ray logs of Bahariya Formation, Western Desert, Egypt. The studied rocks possess a range of radiogenic heat production varying from 0.21 ?Wm(-3) to 2.2 ?Wm(-3). Sandstone rocks of Bahariya Formation have higher radiogenic heat production than the average for crustal sedimentary rocks. The high values of density log of Bahariya Formation indicate the presence of iron oxides which contribute the uranium radioactive ores that increase the radiogenic heat production of these rocks. The average radiogenic heat production produced from the study area is calculated as 6.3 kW. The histogram and cumulative frequency analyses illustrate that the range from 0.8 to 1.2 ?Wm(-3) is about 45.3% of radiogenic heat production values. The 3D slicing of the reservoir shows that the southeastern and northeastern parts of the study area have higher radiogenic heat production than other parts. PMID:23291561

  9. Archean Age Fossils from Northwestern Australia (Approximately 3.3 to 3.5 GA, Warrawoona Group, Towers Formation)

    NASA Technical Reports Server (NTRS)

    Smith, Penny A. Morris

    1999-01-01

    Archean aged rocks from the Pilbara Block area of western Australia (Warrawoona Group, Towers Formation, -3.3-3.5 Ga) contain microfossils that are composed of various sizes of spheres and filaments. The first descriptions of these microfossils were published in the late 1970's (Dunlop, 1978; Dunlop, et. al., 1978). The authenticity of the microfossils is well established. The small size of the microfossils prevents isotope dating, at least with the present technology. Microbiologists, however, have established guidelines to determine the authenticity of the Archean aged organic remains (Schopf, Walter, 1992).

  10. NORTHWESTERN UNIVERSITY VETERANS AND

    E-print Network

    Staum, Jeremy

    NORTHWESTERN UNIVERSITY VETERANS AND Individuals WITH Disabilities JOB FAIR Northwestern University is Pleased to Announce its 2nd Annual Veterans and Individuals with Disabilities JOB FAIR! In honor and recognition of Veterans and National Disability Employment Awareness Month, you are invited to come out

  11. [Type text] Northwestern University

    E-print Network

    Shull, Kenneth R.

    ) 782-7860 (24-hour response) Illinois Radiological Assistance Team (217) 785-0600 Hazardous Waste Dump[Type text] Northwestern University Office for Research Safety Hazardous Waste Management Program http://www.research.northwestern.edu/ors/ Hazardous Waste Disposal Guide Revised: May 2014 #12

  12. Discover Northwestern: Chicago Campus

    E-print Network

    Shahriar, Selim

    @northwestern.edu Printed 12/2012 Printed on recycled paper If you decide to drive, limited parking is available = $_________ Annual maintenance cost Recent statistics from AAA show that the average cost of maintenance and tires

  13. Research Computing at Northwestern University

    E-print Network

    Shahriar, Selim

    Advanced Research Computing at Northwestern University 2014­2015 Northwestern University University Library and NUIT have partnered on the development of new research computing consulting space & Proposal Consultation: One-on-one consultation for defining requirements for research computing, authoring

  14. AT NORTHWESTERN SKIN CANCER INSTITUTE

    E-print Network

    Engman, David M.

    THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE SKIN CANCER INSTITUTE THE INSTITUTES AT NORTHWESTERN MEDICINE #12;THE INSTITUTES AT NORTHWESTERN MEDICINE "Through the Skin Cancer Institute, we are endeavoring to reverse the growing incidence of all forms of skin cancer by contributing breakthroughs and innovations

  15. Northwestern University Transportation Center

    E-print Network

    Bustamante, Fabián E.

    Northwestern University Transportation Center 2011 Business Advisory Committee NUTC #12;#12;I have the pleasure of presenting our Business Advisory Committee members--a distinguished group of transportation industry lead- ers who have partnered with the Transportation Center in advancing the state of knowledge

  16. Northwestern University Recombinant DNA

    E-print Network

    Shull, Kenneth R.

    Northwestern University Recombinant DNA Safety Program Office of Research Safety Office of the Vice President for Research and Graduate Studiesv #12;2/991 1.0 Introduction Research involving recombinant Recombinant DNA Molecules" (NIH Guidelines) as published in the Federal Register (www

  17. RESEARCH BUILDING AT NORTHWESTERN

    E-print Network

    Engman, David M.

    BIOMEDICAL RESEARCH BUILDING AT NORTHWESTERN MEDICINE #12;"Our new Biomedical Research Building-intensive medical schools. Perkins+Will has designed a building that will be superbly functional and have great a magnificent 12-story Biomedical Research Building to address this priority. The new 600,000 square foot

  18. DENDROCHRONOLOGY IN NORTHWESTERN INDIANA

    Microsoft Academic Search

    FRANK L. CHARTON; JAY R. HARMAN

    1973-01-01

    Wood samples from mature living Quercus alba (white oak) specimens in thirty-four woodlots across northwestern Indiana were analyzed by standard dendrochronological techniques. Trees growing on fine-textured soils reflected the greatest environmental stress, a result supporting an earlier hypothesis that the local distribution of xeric, oak-hickory plant communities was related to soil texture. Growth-ring patterns of trees from four woodlots near

  19. Griphotherion peiranoi, gen. et sp. nov., a new Eocene Notoungulata (Mammalia, Meridiungulata) from northwestern Argentina

    Microsoft Academic Search

    Daniel A. García López; Jaime E. Powell

    2011-01-01

    Griphotherion peiranoi, a new genus and species of notoungulate from northwestern Argentina, is presented here. The material studied consists of a nearly complete skull and part of the postcranial skeleton, recovered in the Lumbrera Formation (Eocene) at the locality of El Simbolar (Salta Province, northwestern Argentina). The specimen was evaluated in terms of a matrix of 28 craniodental characters and

  20. Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine Student Handbook Updated August 27, 2013 #12. Northwestern University Feinberg School of Medicine Augusta Webster, MD, Office of Medical Education 303 E

  1. Northwestern University Archives Evanston, Illinois WOMAN'S COLLEGE OF NORTHWESTERN UNIVERSITY,

    E-print Network

    , under pressure from Northwestern University's new President, Dr. Charles Fowler, as well as from leaving town; however, in all other matters the College permitted University women to "be regulated, and Northwestern University President C. H. Fowler. Amelia Sanford's file also contains letters to Rev. and Mrs. S

  2. Petrologic and experimental evidence for the etching of garnets by organic acids in the upper Jurassic Morrision Formation, northwestern New Mexico.

    USGS Publications Warehouse

    Hansley, P.L.

    1987-01-01

    Etching of garnets and partial to complete dissolution of other aluminosilicate minerals were caused by high concentrations of organic acids generated during the maturation of epigenetic organic matter (predominantly type-III kerogen) in the Morrison Formation. The presence of authigenic phases that form near 100oC indicates that temperatures were high enough during diagenesis to cause the thermal degradation of kerogen.-from Author

  3. Variations in vitrinite reflectance values for the Upper Cretaceous Mesaverde Formation, southeastern Piceance basin, northwestern Colorado; implications for burial history and potential hydrocarbon generation. The Frying Pan Member of the Maroon Formation; a lower Permian( ) basin-margin dune field in northwestern Colorado

    SciTech Connect

    Nuccio, V.F.; Johnson, R.C.; Johnson, S.Y.

    1989-01-01

    Most of the Upper Cretaceous Mesaverde Formation in the southeastern Piceance basin is thermally mature enough to have produced hydrocarbons by thermal generation, but only part of the Mesaverde is thermally mature enough to have expelled significant amounts of natural gas. The Early Permian( ) Frying pan Member of the Maroon Formation consists of quartz rich, very fine to fine-grained sandstone deposited in eolian dune and interdune environments. The Frying pan Member (formerly called the sandstone of the Frying pan River) is removed from the State Bridge Formation and assigned to the Maroon Formation.

  4. Medical Student Research Programs Northwestern University Feinberg School of Medicine

    E-print Network

    Apkarian, A. Vania

    Medical Student Research Programs Northwestern University Feinberg School of Medicine Research Northwestern University Feinberg School of Medicine Northwestern University Feinberg School of Medicine to improve patient care and safety. Feinberg provides 60 percent of all research across Northwestern

  5. Northwestern University Feinberg School of Medicine

    E-print Network

    Engman, David M.

    Northwestern University Feinberg School of Medicine Student Handbook Updated April 22, 2014 #12;ALL AT THE BEGINNING OF THE ACADEMIC YEAR. ON OCCASION PERIODIC UPDATES ARE NECESSARY. Northwestern University Feinberg

  6. Northwestern University Program in Public Health

    E-print Network

    Contractor, Anis

    Northwestern University Program in Public Health Faculty Handbook 2011-2012, v. 3 #12;Northwestern University Program in Public Health Faculty and Advisor Handbook, 2011-2012 v. 3.0 http ............................................................................................2 TGS faculty handbook

  7. Northwestern Engineering Electrical Engineering & Computer Science

    E-print Network

    Kuzmanovic, Aleksandar

    McCormick Northwestern Engineering 1 Electrical Engineering & Computer Science Learning to Group- keng Liao, Alok Choudhary Dept. of Electrical Engineering and Computer Science Center for Ultra.northwestern.edu #12;McCormick Northwestern Engineering 2 Electrical Engineering & Computer Science Introduction

  8. NorthwesternUniversity Feinberg School of Medicine

    E-print Network

    Contractor, Anis

    NorthwesternUniversity Feinberg School of Medicine Director of Clinical Education and Human Movement Sciences (PTHMS), Northwestern University Feinberg School of Medicine invites applicants in the United States. To learn more about PTHMS, please visit: http://www.feinberg.northwestern.edu/ nupthms

  9. Aleksandar Kuzmanovic Northwestern University akuzma@northwestern.edu

    E-print Network

    Kuzmanovic, Aleksandar

    University of Belgrade, Belgrade, Serbia Thesis: An Improved Flow Control Algorithm for the ITU-T T.125, Belgrade, Serbia Honors and Awards Associated Student Government (ASG) Faculty Honor Roll, Northwestern for available bandwidth estimation on an Internet path. Mihajlo Pupin Institute of Technology, Belgrade, Serbia

  10. Frances Searle Building Northwestern University

    E-print Network

    Bustamante, Fabián E.

    .northwestern.edu Marc A. Smith Chief Social Scientist Connected Action Consulting Group Marc@connectedaction.net www.connectedaction.net If you would like to meet with Dr. Marc A. Smith dur- ing his visit please contact SONIC Program and images of Twitter, flickr, YouTube, and email networks will be presented. Marc Smith is a sociologist

  11. Strategic Planning at Northwestern Introductions

    E-print Network

    Growing research base Balance between education and research Emphasis on collaboration Strength Context at Northwestern (cont.) Competing against some peers with richer endowments; they are currently Cooperation across schools Good faculty/administrative relations #12;7 Key External Developments GENERAL

  12. AT NORTHWESTERN EARLY CANCER DETECTION

    E-print Network

    Engman, David M.

    --including lung cancer, pancreatic cancer, and ovarian cancer-- there is simply no screening option available, such as pancreatic, ovarian, and lung cancer. · Improve existing screening techniques, such as those for colon cancer, with the THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE EARLY CANCER DETECTION TECHNOLOGIES INSTITUTE

  13. Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM 2012) in the Department of _____________________________________________ at Northwestern University Feinberg School) elective in the Department of __________________________________at Northwestern University Feinberg School

  14. Departments | Centers | Institutes Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Departments | Centers | Institutes Northwestern University Feinberg School of Medicine The Northwestern University Feinberg School of Medicine has many excellent departments, centers, institutes | Programs Northwestern University Feinberg School of Medicine #12;Departments Anesthesiology Cell

  15. www.law.northwestern.edu www.law.northwestern.edu | 1

    E-print Network

    Apkarian, A. Vania

    www.law.northwestern.edu #12;#12;www.law.northwestern.edu | 1 At Northwestern Law the overarching the challenges of the changing world better than those of any other law school. We go beyond teaching the basics the delivery of justice, and respond to the changing contexts in which law and legal institutions operate. Our

  16. Northwestern University Feinberg School of Medicine INSURANCE PAYMENT FORM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine INSURANCE PAYMENT FORM VISITING STUDENT:____________________________________________________ Visiting Student Programs Northwestern University Feinberg School of Medicine Augusta Webster Office

  17. Northwestern University Feinberg School of Medicine APPLICATION PAYMENT FORM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine APPLICATION PAYMENT FORM VISITING STUDENT: _________________________________________________ Visiting Student Programs Northwestern University Feinberg School of Medicine Augusta Webster Office

  18. Northwestern Engineering Electrical Engineering & Computer Science

    E-print Network

    Kuzmanovic, Aleksandar

    McCormick Northwestern Engineering 1 Electrical Engineering & Computer Science SES: Sentiment, Diana Palsetia, Kathy Lee, Wei-keng Liao, Alok Choudhary Dept. of Electrical Engineering and Computer Mining Vancouver, Canada, December 2011 #12;McCormick Northwestern Engineering 2 Electrical Engineering

  19. Modeling Recovery Rates and Pathways for Woody Debris Recruitment in Northwestern Washington Streams

    Microsoft Academic Search

    Timothy J. Beechie; George Pess; Paul Kennard; Robert E. Bilby; Susan Bolton

    2000-01-01

    We modeled large woody debris (LWD) recruitment and pool formation in northwestern Washington streams after simulated stand-clearing disturbance using two computer models: Forest Vegetation Simulator for stand development and Riparian-in-a-Box for LWD recruitment, depletion, and pool formation. We evaluated differences in LWD recruitment and pool formation among different combinations of channel size, successional pathway, and stand management scenario. The models

  20. Frank Thompson frankthompson8@northwestern.edu

    E-print Network

    Shull, Kenneth R.

    , Organizational Effectiveness ACADEMIC ACCOMPLISHMENTS Psychology of Organizations, Northwestern University effectiveness. Contributed to a report that provided a set of comprehensive recommendations for improved such as advertising and soliciting volunteers. LEADERSHIP EXPERIENCE North Canton High School Swim Team, Canton

  1. NORTHWESTERN UNIVERSITY Laboratory Safety and Chemical Hygiene

    E-print Network

    Shull, Kenneth R.

    ...............................................................................................14 2.7.4 Laser Safety CommitteeNORTHWESTERN UNIVERSITY Laboratory Safety and Chemical Hygiene Plan Office for Research Safety.............................................................................................................................................12 2.6 Office for Research Safety

  2. Northwestern University Feinberg School of Medicine ACCEPTED STUDENT REGISTRATION PAYMENT FORM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine ACCEPTED STUDENT REGISTRATION PAYMENT FORM: _____________________________________________________ Signature of Card Holder: ____________________________________________ Northwestern University Feinberg

  3. Departments | Centers | Institutes Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Departments | Centers | Institutes Northwestern University Feinberg School of Medicine The Northwestern University Feinberg School of Medicine has many excellent departments, centers, institutes offerings with the creation of the Institute for Public Health & Medicine, which combined interdisciplinary

  4. Director, Physician Assistant Program Northwestern University Feinberg School of Medicine

    E-print Network

    Contractor, Anis

    Director, Physician Assistant Program Northwestern University Feinberg School of Medicine The Northwestern University Feinberg School of Medicine invites applications and nominations for the position assistant education. The new Director will actively collaborate with faculty and staff of the Feinberg

  5. Fall 2010 www.it.northwestern.edu Get Connected

    E-print Network

    Shull, Kenneth R.

    to Microsoft. Course Management System (Blackboard) http://courses.northwestern.edu Communicate and collaborate Library Resources http://einstein.library.northwestern.edu Find databases, e-journals, and more at the Library's extensive online resource site. Computer Labs http

  6. Summer Research Experience for Undergraduates at Northwestern The Materials Research Science and Engineering Center (MRSEC) at Northwestern

    E-print Network

    Levine, Alex J.

    in science and engineering fields. Research areas include ceramics, polymers, nanocomposites, photonicsSummer Research Experience for Undergraduates at Northwestern University The Materials Research Science and Engineering Center (MRSEC) at Northwestern University offers a 9-week, paid summer research

  7. Feinberg Fact Sheet Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Feinberg Fact Sheet Northwestern University Feinberg School of Medicine The mission of Northwestern University Feinberg School of Medicine is to mentor and educate students to become exceptional, compassionate. And we play an integral role in the communities we serve. Feinberg Facts Northwestern University Feinberg

  8. Brand Guidelines Northwestern University Feinberg School of Medicine

    E-print Network

    Engman, David M.

    Brand Guidelines Northwestern University Feinberg School of Medicine Published February 9, 2010 djfhakjd ExitForwardBack #12;1 Northwestern University Feinberg School of Medicine Brand Guidelines Story University Medical School was renamed Northwestern University Feinberg School of Medicine (Feinberg

  9. STUDENT HANDBOOK Northwestern University School of Continuing Studies

    E-print Network

    Shahriar, Selim

    STUDENT HANDBOOK Northwestern University School of Continuing Studies Undergraduate and Post-baccalaureate Certificate Programs 2013-2014 #12;UNDERGRADUATE STUDENT HANDBOOK 2013-2014 NORTHWESTERN UNIVERSITY SCHOOL-baccalaureate Student Handbook Welcome to Northwestern University School of Continuing Studies' undergraduate and post

  10. Interannual variability of sea fog frequency in the Northwestern Pacific in July

    NASA Astrophysics Data System (ADS)

    Zhang, Suping; Chen, Yang; Long, Jingchao; Han, Geng

    2015-01-01

    The interannual variability in the sea fog frequency (SFF) in July in the midlatitude Northwestern Pacific (40°N-50°N, 140°E-170°W) from 1979 to 2009 is investigated with observations and reanalysis datasets. Composite analysis shows that in high-SSF years the center of the Northwestern Pacific subtropical high (SH) shifts eastward and a strengthened ridge exists in the midlatitude Northwestern Pacific. Under such conditions, large amount of moisture from the subtropics are transported northwardly by the southerlies over the west flank of the SH. The ridge is helpful for stable stratification and conductive to fog formation. In contrast, in low-SFF years the center of the SH expands westward and drifts further south; thus moisture can hardly reach the midlatitudes. Meanwhile an anomalous trough in the midlatitudes and the associated anomalous northerlies both weaken the southerlies and reduce the stability, unfavorable for fog occurrence. The case studies confirmed that the air parcels moving from the subtropical zone to the midlatitudes controlled by the SH, kept the higher temperature and humidity when flowing across the Kuroshio Extension, and then cooled down over the cold oceanic surface in fog case. The SFF in the Northwestern Pacific would decline under the conditions of global warming.

  11. Middle proterozoic compressional orogen in northwestern Canada

    Microsoft Academic Search

    Frederick A. Cook

    1988-01-01

    Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of

  12. Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve

    NSDL National Science Digital Library

    Describes the unique Northwestern Hawaiian Islands (NWHI) Ecosystem Reserve. Provides resources focused on NWHI coral reef ecosystems, and introductions to reef research, management and protection activities. Educational outreach includes: teacher workshops; student activities, and a Discovery Center in Hilo, Hawaii that features exhibits and activities for schools and the public.

  13. NORTHWESTERN UNIVERSITY CALENDAR OF EVENTS & ACTIVITIES

    E-print Network

    Amaral, Luis A.N.

    celebrating the life of Dr. Martin Luther King, Jr., visit www.northwestern.edu/mlk DINNER DIALOGUES 6:00pm-7 otherwise. This month's program will continue the University's celebration of Martin Luther King, Jr. Meal of Martin Luther King, Jr. Day, with a keynote address delivered by civil rights activist, author

  14. Northwestern University Feinberg School of Medicine

    E-print Network

    Engman, David M.

    1 Northwestern University Feinberg School of Medicine Web Content Style Guide June 2013 #12.....................................................................................................................................................10 #12;3 Guide Purpose The purpose of this guide is to provide contributors of feinberg Feinberg site, and focus their information for greatest impact to web readers. The document also includes

  15. Northwestern University School of Speech: A History.

    ERIC Educational Resources Information Center

    Rein, Lynn Miller

    This book presents a concise history of the first 100 years of development of the school of speech at Northwestern University (Illinois). Following an introduction that provides an overview of the school, the first chapter focuses on both the efforts of Robert McLean Cumnock to found a school of oratory on the principles of elocution and the…

  16. NORTHWESTERN UNIVERSITY Department of Art History

    E-print Network

    to represent both the unprecedented level of destruction that the war unleashed, and revolutionary changesAH_367 NORTHWESTERN UNIVERSITY Department of Art History PICTURING THE CIVIL WAR Professor Christine Bell The Civil War precipitated a crisis in American visual culture, introducing new subject

  17. Northwestern University Office for Research Safety

    E-print Network

    Shahriar, Selim

    Northwestern University Office for Research Safety Laser Safety Handbook February 2011 1 #12;Laser Appendix C: Biological Effects 14 Appendix D: Laser Safety for Microscopy, Spectroscopy and Imaging Units: Parameters and Correction factors 18 #12;Laser Safety Handbook February 2011 1 1.0 Introduction Lasers have

  18. Northwestern EECS 213 SETI Lab (Beta Test)

    E-print Network

    Dinda, Peter A.

    for Extraterrestrial Intelligence (SETI) is a long-standing international effort to try to findNorthwestern EECS 213 SETI Lab (Beta Test) Spring 2013 The Search for a specific kind of intelligent signal within it, specifically an AM radio signal

  19. Ecotypic response to ultramafic soils by some plant species of northwestern United States

    Microsoft Academic Search

    Arthur R. Kruckeberg

    1967-01-01

    Soils high in magnesium derived from ultramafic rocks (serpentine, peridotite, and dunite) in northwestern United States support\\u000a endemic as well as wide-ranging but edaphically indifferent(bodenvag) species. The latter occur widely on diverse rock formations of the region. Severalbodenvag species are shown to respond ecotypically to ultramafic soils. Of 18 species tested, all but three are differentiated into\\u000a strains either tolerant

  20. Ticks parasitizing dogs in northwestern Georgia.

    PubMed

    Goldberg, M; Recha, Y; Durden, L A

    2002-01-01

    From January 1998 through September 1999, 324 dogs in three northwestern Georgia counties were examined for ticks. Six species of ticks were recovered. The three most commonly collected ticks were the American dog tick, Dermacentor variabilis (Say) (310 male male, 352 female female; prevalence, 97%; mean intensity 2.1); the brown dog tick, Rhipicephalus sanguineus (Latreille) (118 male male, 119 female female, 38 nymphs; prevalence, 22%; mean intensity, 3.8); and the lone star tick, Amblyomma americanum (L.) (8 male male 26 female female, 2 nymphs; prevalence, 5%; mean intensity, 2.4). Other ticks recovered were Ixodes cookei Packard (3 female female); the Gulf Coast tick, Amblyomma maculatum Koch (2 female female); and the blacklegged tick, Ixodes scapularis Say (1 female). Another adult female specimen of I scapularis was recovered from a cat, further reinforcing that this medically important tick is present in northwestern Georgia. PMID:11931241

  1. DEPARTMENT OF PHYSICAL THERAPY AND HUMAN MOVEMENT SCIENCES NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE

    E-print Network

    Contractor, Anis

    DEPARTMENT OF PHYSICAL THERAPY AND HUMAN MOVEMENT SCIENCES NORTHWESTERN UNIVERSITY FEINBERG SCHOOL/ore electronic (Internet) version at the Feinberg School of Medicine, Northwestern University, as requested, Department of Physical Therapy & Human Movement Sciences, Northwestern University's Feinberg School

  2. Northwestern University | Physical Sciences in Oncology

    Cancer.gov

    Northwestern University Physical Sciences-Oncology Center's (NU PS-OC) main focus is to probe the molecular basis of information flow within malignant cells. This center’s studies will highlight diverse characteristics of gene expression and storage. Moreover, these investigators postulate that in the cancerous state, the epigenome is significantly mutated. By merging experimental molecular and cellular biology with the physical sciences, these investigators will examine the regulation and expression of genes.

  3. Northwestern University Feinberg School of Medicine 2009 Award Winners

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine 2009 Award Winners Fifth Annual Lewis Landsberg Science Research Stephen D. Persell A multimodality outpatient quality improvement intervention using

  4. Young L. Kim Northwestern University, Feinberg School of Medicine, Chicago, IL

    E-print Network

    Kim, Young L.

    Short CV Young L. Kim Education Northwestern University, Feinberg School of Medicine, Chicago, IL, Feinberg School of Medicine, Northwestern University, Chicago, IL: September 2005 ­ July 2007 (Cancer

  5. Northwestern University Feinberg School of Medicine TUITION and INSURANCE PAYMENT FORM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine TUITION and INSURANCE PAYMENT FORM VISITING Northwestern University Feinberg School of Medicine Augusta Webster Office of Medical Education 303 East

  6. Biomedical Research Building Through Northwestern Medicine, We Will

    E-print Network

    Engman, David M.

    Northwestern Medicine and to stand among the nation's top academic medical centers. We have launched We Will and improve the lives of our students, trainees, alumni, faculty and staff, patients, and local and global to replace the current facilities at Northwestern Medicine Lake Forest Hospital. As the cornerstone

  7. PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE

    E-print Network

    Engman, David M.

    PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE Pain diseases such as diabetes and stroke. The outpatient Pain Medicine Center within the Department of Anesthesiology at Northwestern Medicine offers hope to patients with chronic pain. Starting with a comprehensive

  8. NorthWestern Energy Community Works Scholarship for Electrical Engineering

    E-print Network

    Dyer, Bill

    20131030 NorthWestern Energy Community Works Scholarship for Electrical Engineering A special Electrical Engineering, NorthWestern Energy has established a scholarship program administered by the Montana and interests, and how they relate to electrical engineering, energy production, control, and/or transmission

  9. NorthWestern Energy Community Works Scholarship for Electrical Engineering

    E-print Network

    Lawrence, Rick L.

    20121204 NorthWestern Energy Community Works Scholarship for Electrical Engineering A special new Electrical Engineering, NorthWestern Energy has established a scholarship program administered by the Montana, and how they relate to electrical engineering, energy production, control, and/or transmission. Within

  10. Feinberg Fact Sheet Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Feinberg Fact Sheet Northwestern University Feinberg School of Medicine The defining mission of Northwestern University Feinberg School of Medicine is to mentor and educate students to become exceptional and the upper Midwest. And we play an integral part in the communities we serve. Feinberg Fact Sheet

  11. Fall 2008 www.it.northwestern.edu Get Connected

    E-print Network

    Shahriar, Selim

    .it.northwestern.edu Course Management System (Blackboard) http://course-management.northwestern.edu/ Communicate and collaborate with students through the newly upgraded system that supports Web-based learning, peer is located on the second floor, east tower of the University Library. Smart Classrooms http

  12. Bankfull discharge and sediment transport in northwestern California

    Microsoft Academic Search

    K. M. NOLAN

    High-magnitude, low-frequency discharges are more responsible for transporting suspended sediment and forming channels in northwestern California than in previously studied areas. Bankfull discharge and the magnitude and frequency of suspended sediment discharge were determined at five gaging stations in northwestern California. Although discharges below which 50 percent of the suspended sediment was transported and discharges which transport the greatest suspended

  13. Internship Search Survey 2010 Northwestern University Career Services

    E-print Network

    Shull, Kenneth R.

    Internship Search Survey 2010 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

  14. Internship Search Survey 2011-2012 Northwestern University Career Services

    E-print Network

    Shull, Kenneth R.

    Internship Search Survey 2011-2012 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from Campus Labs, an online survey

  15. Internship Search Timeline University Career Services Northwestern University

    E-print Network

    Shull, Kenneth R.

    Internship Search Timeline University Career Services Northwestern University Research your is a general internship search timeline designed to help you organize and conduct an effective internship search. September/October Register with Northwestern's CareerCat and iNet. Sign-up for the Internship

  16. Summer Internship Grant Program (SIGP) University Career Services Northwestern University

    E-print Network

    Shull, Kenneth R.

    Summer Internship Grant Program (SIGP) University Career Services Northwestern University Facebook to develop SIGP to fund stipends for students completing unpaid summer internships. In addition to money of $2500 each for students completing unpaid summer internships. Who is eligible for SIGP? Any Northwestern

  17. Internship Search Survey 2011 Northwestern University Career Services

    E-print Network

    Shull, Kenneth R.

    Internship Search Survey 2011 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

  18. December 4th Safety Standards for the Northwestern University

    E-print Network

    Grzybowski, Bartosz A.

    , safety shields, and appropriate laser safety goggles. 7. Northwestern issued (approved) glovesDecember 4th , 2013 Safety Standards for the Northwestern University Department of Chemistry or supervisor; AND b. The Office of Research Safety 2. All members of the Chemistry Department have

  19. Geology and petroleum resources of northwestern Africa

    SciTech Connect

    Peterson, J.A.; Klemme, H.D.

    1986-05-01

    The main onshore basins of northwestern Africa are (1) basins in the Atlas folded geosynclinal belt adjacent to the Mediterranean Sea, (2) the Tindouf, Bechar, and Reggane basins of western Algeria and southern Morocco, and (3) the Taoudeni basin of Mauritania and Mali. Coastal basins are (1) the Essaouria basin of southwestern Morocco, (2) the Tarfaya basin of Western Sahara, (3) the Senegal basin of Senegal and western Mauritania, (4) the Sierra Leone-Liberia basin, and (5) the Ivory Coast basin. The petroleum geology and resource potential of these basins is detailed.

  20. 2012 1098-T Page1 NorthwesternUniversity CAESAR/SES Updated:10/26/2012

    E-print Network

    Shahriar, Selim

    ©2012 1098-T Page1 NorthwesternUniversity CAESAR/SES Updated:10/26/2012 SES/CAESAR v. 9.0 Student-5224 or studentaccounts-ev@northwestern.edu Step 1 Navigate to the CAESAR login page, http://www.northwestern.edu/caesar and navigate to Student Financial Services > 1098-T. #12;©2012 1098-T Page2 NorthwesternUniversity CAESAR

  1. Biogeochemistry of a treeline watershed, northwestern Alaska

    USGS Publications Warehouse

    Stottlemyer, R.

    2001-01-01

    Since 1950, mean annual temperatures in northwestern Alaska have increased. Change in forest floor and soil temperature or moisture could alter N mineralization rates, production of dissolved organic carbon (DOC) and organic nitrogen (DON), and their export to the aquatic ecosystem. In 1990, we began study of nutrient cycles in the 800-ha Asik watershed, located at treeline in the Noatak National Preserve, northwestern Alaska. This paper summarizes relationships between topographic aspect, soil temperature and moisture, inorganic and organic N pools, C pools, CO2 efflux, growing season net N mineralization rates, and stream water chemistry. Forest floor (O2) C/N ratios, C pools, temperature, and moisture were greater on south aspects. More rapid melt of the soil active layer (zone of annual freeze-thaw) and permafrost accounted for the higher moisture. The O2 C and N content were correlated with moisture, inorganic N pools, CO2 efflux, and inversely with temperature. Inorganic N pools were correlated with temperature and CO2 efflux. Net N mineralization rates were positive in early summer, and correlated with O2 moisture, temperature, and C and N pools. Net nitrification rates were inversely correlated with moisture, total C and N. The CO2 efflux increased with temperature and moisture, and was greater on south aspects. Stream ion concentrations declined and DOC increased with discharge. Stream inorganic nitrogen (DIN) output exceeded input by 70%. Alpine stream water nitrate (NO-3) and DOC concentrations indicated substantial contributions to the watershed DIN and DOC budgets.

  2. SHRIMP U–Pb zircon geochronology and geochemistry of metavolcanic and metasedimentary rocks in Northwestern Fujian, Cathaysia block, China: Tectonic implications and the need to redefine lithostratigraphic units

    Microsoft Academic Search

    Yusheng Wan; Dunyi Liu; Meihui Xu; Jianmin Zhuang; Biao Song; Yuruo Shi; Lilin Du

    2007-01-01

    Northwestern Fujian Province is one of the most important Pre-Palaeozoic areas in the Cathaysia Block of South China. Metavolcano-sedimentary and metasedimentary rocks of different types, ages and metamorphic grades (granulite to upper greenschist facies) are present, and previously were divided into several Formations and Groups. Tectonic contacts occur between some units, whereas (deformed) unconformities have been reported between others. New

  3. The variation of morphological features and mineralogical components of biological soil crusts in the Gurbantunggut Desert of Northwestern China

    Microsoft Academic Search

    Rongyi Chen; Yuanming Zhang; Yuan Li; Wenshou Wei; Jing Zhang; Nan Wu

    2009-01-01

    Increasingly complex life forms were found in older biological soil crusts in the Gurbantaunggut Desert in Northwestern China.\\u000a These crusts may play a critical role in mineral erosion and desert soil formation by modifying the weathering environment\\u000a and ultimately affecting mineralogical variance. To test this hypothesis, variations in the morphological features and mineralogical\\u000a components of successional biological soil crusts at

  4. PALINSPASTIC RECONSTRUCTION AROUND A THRUST BELT RECESS: AN EXAMPLE FROM THE APPALACHIAN THRUST BELT IN NORTHWESTERN GEORGIA

    Microsoft Academic Search

    Brian Stephen Cook

    2010-01-01

    In a well-defined subrecess in the Appalachian thrust belt in northwestern Georgia, two distinct regional strike directions intersect at approximately 50°. Fault intersections and interference folds enable tracing of both structural strikes. Around the subrecess, tectonically thickened weak stratigraphic layers—shales of the Cambrian Conasauga Formation—accommodated ductile deformation associated with the folding and faulting of the overlying Cambrian–Ordovician regional competent layer.

  5. Geomorphological context of the basins of Northwestern Peninsular Malaysia

    NASA Astrophysics Data System (ADS)

    Sautter, Benjamin; Pubellier, Manuel; Menier, David

    2014-05-01

    Geomorphological context of the basins of Northwestern Peninsular Malaysia Benjamin Sautter, Manuel Pubellier, David Menier Department of Petroleum Geosciences, Universiti Teknologi PETRONAS CNRS-UMR 8538, Ecole Normale Supérieure, 24, Rue Lhomond, 75231, Paris Cedex 05, France Petroleum basins of Western Malaysia are poorly known and their formation is controlled by the Tertiary stress variations applied on Mesozoic basement structures. Among these are the Paleozoic-Mesozoic Bentong Raub, Inthanon, and Nan suture zones. By the end of Mesozoic times, the arrival of Indian plate was accompanied by strike slip deformation, accommodated by several Major Faults (Sagaing, Three Pagodas, Mae Ping, Red River, Ranong and Klong Marui Faults). Due to changes in the boundary forces, these areas of weakness (faults) were reactivated during the Tertiary, leading to the opening of basins in most of Sundaland. Within this framework, while most of the Sundaland records stretching of the crust and opening of basins (SCS, Malay, Penyu, Natuna, Mergui) during the Cenozoics, Peninsular Malaysia and the Strait of Malacca are considered to be in tectonic quiescence by most of the authors. We present the geomorphology of the Northwestern Malaysia Peninsula with emphasis on the deformations onshore from the Bentong Raub Suture Zone to the Bok Bak Fault, via the Kinta Valley, and offshore from the Port Klang Graben to the North Penang Graben. By analyzing Digital Elevation Model from ASTER and SRTM data, two main directions of fractures in the granitic plutons are highlighted: NW-SE to W-E sigmoidal faults and N-S to NE-SW linear fractures which seem to cross-cut the others. In the field in the area of the Kinta Valley (Western Belt, NW Peninsular Malaysia), granitic bodies show intense fracturation reflecting several stages of deformation. The granites are generally syntectonic and do not cut fully across the Late Paleozoic platform limestone. Two sets of fractures (NW-SE and NE-SW) appear more penetrative in both granitic and limestone units. On most of the studied outcrops, exfoliation fractures are reactivated into normal faults. Deformation is particularly severe at the contact of the granites and the sediments which is underlined by cataclasic quartz dykes and hornfelds. Off-shore, in the Straits of Malacca, nine tertiary half-grabens are present, all oriented in N-S to NE-SW direction with N-S boundary faults on their western margin. We propose a tectonic scenario for the north-western Malaysia Peninsula according to which the northward motion of India induced first right-lateral transpressionnal tectonics at the End of the Mesozoics (Cretaceous early Tertiary). This system is illustrated in the NW-SE trending fractures of the Main Range Batholith and other Triassic plutons within a system bounded and controlled by the Bok Bak Fault, the KL fault zone and the Bentong Raub Suture Zone. Later, a second stage of transtension led to the opening of the en echelon onshore basins in a tear-faults system, and to the opening of half grabens offshore in the Straits of Malacca.

  6. Solimoes megashear: Intraplate tectonics in northwestern Brazil

    SciTech Connect

    Caputo, M.V. (Petroleo Brasileiro S.A.-Petrobras, Belem, Para (BRAZIL))

    1991-03-01

    A belt of deformation in the Solimoes basin of northwestern Brazil extends east-northeast from near the Peruvian border for about 1300 km. The belt is characterized by the en echelon arrangement of folds and faults interpreted as the result of right-slip displacements in a transpressive regime. The structures were formed during Late Jurassic time, probably due to collision of South America with allochthonous terranes as the opening of the South Atlantic Ocean began. The Iquitos arch near the western end of the megashear separates the Solimoes basin from Subandean basins. The development of the Iquitos arch is interpreted to be related to orogenic loading along western South America by the Andean mountain belt. In Brazil, folds and faults associated with the Solimoes megashear hold hydrocarbons within Paleozoic strata, and 15 gas and oil fields have so far been discovered.

  7. Northwestern University Library: Data & Methods Bank

    NSDL National Science Digital Library

    2013-06-12

    How does one conduct a collection assessment? It's a very timely question and one that is answered most thoroughly via this guide from the Northwestern University Library. Clicking on the What is in this Guide? link will help interested parties navigate the swath of material available here on topics like interdisciplinary analysis, qualitative methods, and how to interpret library data. As the materials are designed for library professionals and others in the information sciences, they may require a certain level of technical background in these areas. The materials are divided into eight sections, including Interdisciplinary Analysis, Comparative Analysis, and Cost Projections & Publishing Market. The guides within each area are spot-on and provide the necessary armature for those working in these fields.

  8. Basement involved thrusts from Northwestern Maracaibo Basin

    SciTech Connect

    Audemard, F. (Intevep, S.A., Caracas (Venezuela))

    1993-02-01

    The interpretation of seismic reflection profiles from northwestern Maracaibo Basin, north of the Palmar River, suggests a late Neogene age for all the structures located within the north-northeast trends of anticlinal belts. These folded structures appear to be ramp anticlines generated from basement involved thrusts. Such detachments are intercepted by conjugate systems of low-angle decollements decoupled from the thick shaly intervals of Cretaceous and Eocene age. The resulting configuration of these fault systems are related to a mechanic of deformation referred as [open quotes]fish tail[close quotes]. This structural style favors the superposition of structural traps at different levels. The superposed reservoirs from La Paz, Mara, Sibucara, Mara Oeste, and Ensenada among others constitute superb examples of this style of deformation. Similar anticlinal structures are also observed to the southeast of the Basin in the Ceuta-Tomoporo area.

  9. Facies analysis of the lower cycles of the Mesaverde Group (Upper Cretaceous) in northwestern Colorado

    USGS Publications Warehouse

    Kiteley, L.W.

    1983-01-01

    The uppermost 180 m of the Mancos Shale and overlying 390 m of the Iles Formation of the Mesaverde Group in northwestern Colorado were deposited at the west margin of an epicontinental seaway that spanned North America 66-98 million years ago from the circumboreal seaway on the north to the Gulf of Mexico on the south. Sedimentation in the seaway was controlled by uplift in source areas to the west, subsidence in the basin, and eustatic sea level changes. Sedimentation rates were relatively high, averaging about 220m/million years; marine cycles of deposition occurred in northwestern Colorado that correspond to the Claggett, Judith River, and Bearpaw regressions of Montana. The upper Mancos shale and lower Iles Formation can be subdivided into ten facies based on five criteria: (1) Lithology, texture, and thickness relations (geometry); (2) sedimentary structures and contacts; (3) trace and body fossils; (4) paleocurrent data; and (5) adjoining facies (underlying, overlying, and laterally). Each facies has distinct attributes which characterize a specific depositional environment. Environments represented by facies include (A) offshore shoreface transition (prodelta); (B) shallow marine sand bars; (C) destructional delta front; (D) constructional delta front (sheet sands and mouth bars); (E) beach foreshore-shoreface deposits; (F) interdistributary marsh and swamp deposits and fluvial floodplain; (G) distributary channels; (H) crevasse splays; (J) fluvial streams; and (K) tidally influenced distributary channel. Facies analysis of outcrop data shows that transgressions and regressions occurred, some of which are related to major (eustatic) sea level changes and others that reflect only local causes. These events in northwestern Colorado are summarized in following chapters, and an attempt is made to show their relationship to broad regional patterns of sedimentation.

  10. NORTHWESTERN UNIVERSITY Transmission Electron Microscopy Studies of Surface Phenomena in

    E-print Network

    Shull, Kenneth R.

    scale processes at surfaces dictate the macroscopic properties of solid sur- faces and have been Northwestern University, Evanston, IL 60201, USA iv #12;Acknowledgements First, I would like to thank my

  11. Michal Wiertlewski Department of Mechanical Engineering wiertlewski@northwestern.edu

    E-print Network

    Hartmann, Mitra J. Z.

    ­14 Postdoctoral Researcher, Neuroscience and Robotics Laboratory ( ), Northwestern University, Evanston Il, USA 2014 13 Co-editeur of IEEE's Transaction on Haptics Podcast 11­13 Reviewer, WorldHaptics'11,'13, Haptic

  12. New England: 1. Sea scallop -Northwestern Atlantic Coast (2001)

    E-print Network

    New England: 1. Sea scallop - Northwestern Atlantic Coast (2001) 2. Silver Hake ­ Gulf of Maine/Northern Georges Bank (2002) 3. Silver Hake - Southern Georges Bank / Middle Atlantic (2007) 4. Winter Flounder

  13. New England: 1. Sea scallop -Northwestern Atlantic Coast (2001)

    E-print Network

    New England: 1. Sea scallop - Northwestern Atlantic Coast (2001) 2. Silver hake ­ Gulf of Maine/Northern Georges Bank (2002) 3. Silver hake - Southern Georges Bank / Middle Atlantic (2007) 4. Winter flounder

  14. Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM 2013 University Feinberg School of Medicine. I have read my acceptance letter and approved application Feinberg School of Medicine from ______________(mm/dd/yy) to __________________ (mm

  15. Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine VISITING STUDENT ELECTIVE PROGRAM 2014 University Feinberg School of Medicine. I have read my acceptance letter and approved application Feinberg School of Medicine from ______________(mm/dd/yy) to __________________ (mm

  16. Northwestern University Feinberg School of Medicine 2012 Award Winners

    E-print Network

    Chisholm, Rex L.

    Northwestern University Feinberg School of Medicine 2012 Award Winners Eighth Annual Lewis Coordinator P.I. Stephen Persell, MD, MPH Electronic health record-based patient identification Professor, Obstetrics and Gynecology, Preventive Medicine, and Medical Social Sciences, Feinberg Eighth

  17. The Teaching of Evaluation in Psychology: Northwestern University.

    ERIC Educational Resources Information Center

    Cordray, David; And Others

    1986-01-01

    The applications of evaluation training in clinically oriented social interventions are examined. A joint program in evaluation and clinical psychology at Northwestern University is described. The core evaluation course, which emphasizes methodological study and substantial fieldwork, is discussed. (BS)

  18. FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK - Candler Park Historic District, Roughly bounded by Moreland, Dekalb, McLendon & Harold Avenues, Matthews Street & Clifton Terrace, Atlanta, Fulton County, GA

  19. NORTHWESTERN UNIVERSITY -OFFICE OF RESEARCH DEVELOPMENT Limited Submission Funding Opportunity

    E-print Network

    Contractor, Anis

    NORTHWESTERN UNIVERSITY - OFFICE OF RESEARCH DEVELOPMENT Limited Submission Funding Opportunity U's goals of encouraging mutual understanding, facilitating educational reform, fostering economic within a three-year period, and should describe a process for evaluating the results of project

  20. Holocene Paleolimnological Records from Thule, Northwestern Greenland

    NASA Astrophysics Data System (ADS)

    Corbett, L.; Osterberg, E. C.; Kelly, M. A.; Axford, Y.

    2012-12-01

    Assessing Holocene climatic and environmental variability around the margin of the Greenland Ice Sheet provides important information against which to compare ice sheet margin fluctuations. Here, we report preliminary results from ongoing research in northwestern Greenland. We present records of physical properties of lake sediments and use these to make inferences about the evolution of the lake and its surroundings over the latter half of the Holocene. We collected two sediment cores, 90 and 72 cm in length, from a small (surface area ~0.3 km2), shallow (maximum depth ~4.5 m) lake at 76°33'40''N 68°26'31''W near Thule Air Base in July 2012. The length of the cores was limited by the length of the core barrel and does not reflect the total thickness of sediment in the lake. The lake is situated within the glacial limit and likely formed subsequent to deglaciation of the region during early Holocene time. No glaciers exist within the lake's catchment today; the primary modern source of sediment is a perennial inflow from the west. We developed a preliminary depth-age model using radiocarbon ages of terrestrial organic macrofossils. Thus far, we have analyzed the sediments for magnetic susceptibility and loss-on-ignition. A radiocarbon age of 6069 ± 90 cal yr BP at the base of the core indicates that the sediments preserve a continuous record of middle to late Holocene conditions. The top of both cores consists of a thick (~12 cm) layer of dark gray unlaminated sediments, while the rest of the material in both cores is lighter brown to olive, finely laminated sediment. The upper layer is characterized by low water content (<25%), low loss-on-ignition (<5%), and high magnetic susceptibility (~150-250 x10-6). Conversely, the laminated sediments beneath have higher water content (~40-50%), higher loss-on-ignition (~5-10%), and much lower magnetic susceptibility (<50 x10-6). We hypothesize that the upper, less organic unit may represent a single event in the lake's recent history. We are refining the depth-age model with more radiocarbon ages, measuring grain size and carbon to nitrogen ratios of the sediments, and evaluating possible linkages between the sediment physical properties and precipitation as recorded by annual accumulation in ice cores in northwestern Greenland and Arctic Canada. This project will provide a foundation for future work in Thule investigating Holocene fluctuations of local ice cap and ice sheet margin positions.

  1. Northwestern Tharsis Latent Outflow Activity Mars

    NASA Technical Reports Server (NTRS)

    Dohm, J. M.; Anderson, R. C.; Baker, V. R.; Ferris, J. C.; Hare, T. M.; Strom, R. G.; Rudd, L.; Rice, J. W., Jr.; Scott, D. H.

    2000-01-01

    Previously defined outflow channels, which are indicated by relict landforms similar to those observed on Earth, signify ancient catastrophic flood events on Mars. These conspicuous geomorphic features are some of the most remarkable yet profound discoveries made by geologists to date. These outflow channels, which debouched tremendous volumes of water into topographic lows such as Chryse, Utopia, Elysium, and Hellas Planitiae, may represent the beginning of warmer and wetter climatic periods unlike the present-day cold and dry Mars. In addition to the previously identified outflow channels, observations permitted by the newly acquired Mars Orbiter Laser Altimeter (MOLA) data have revealed a system of gigantic valleys, referred to as the northwestern slope valleys (NSV), that are located to the northwest of a huge shield volcano, Arsia Mons, western hemisphere of Mars. These features generally correspond spatially to gravity lows similar to the easternmost, circum-Chryse outflow channel systems. Geologic investigations of the Tharsis region suggest that the large valley system pre-dates the construction of Arsia Mons and its extensive associated lava flows of mainly Late Hesperian and Amazonian age and coincides stratigraphically with the early development of the circum-Chryse outflow channel systems that debouch into Chryse Planitia. This newly identified system, the NSV, potentially signifies the largest flood event(s) ever recorded for the solar system. Additional information is contained in original extended abstract.

  2. Lyme disease in northwestern coastal California.

    PubMed Central

    Ley, C; Davila, I H; Mayer, N M; Murray, R A; Rutherford, G W; Reingold, A L

    1994-01-01

    To determine the incidence of physician-diagnosed Lyme disease in an endemic area of California, an active surveillance program was implemented in Lake, Mendocino, Sonoma, and southern Humboldt counties. More than 200 medical care providers were called monthly for their list of suspected cases of Lyme disease. Pertinent information was abstracted from the medical record of each patient. Of 153 cases of possible early Lyme disease ascertained from July 1991 to December 1992, 37% consisted of physician-diagnosed erythema migrans. Only 58% of erythema migrans rashes were at least 5 cm in diameter. An additional 43 patients had suspicious rashes not classified as erythema migrans. Of 166 patients with possible late-stage Lyme disease, 31% had specific clinical symptoms and 75% had a positive serologic test. With an incident case defined as physician-diagnosed erythema migrans of at least 5 cm in diameter, the annual incidence of Lyme disease in northwestern coastal California according to active surveillance only was 5.5 per 100,000. The rate of Lyme disease in California is substantially lower than that in the Atlantic northeastern United States. Many suspected cases of Lyme disease in this endemic area do not meet surveillance criteria, which are intentionally restrictive. Although some of the illnesses not meeting surveillance criteria may be due to infection with Borrelia burgdorferi, it appears that Lyme disease is being overdiagnosed in this area. Images PMID:8053175

  3. MISR Images Wildfires in Northwestern US

    NASA Technical Reports Server (NTRS)

    2000-01-01

    MISR image of smoke plumes from devastating wildfires in the northwestern US. This view of the Clearwater and Salmon River Mountains in Idaho was acquired on August 5, 2000 (Terra orbit 3370). The body of water to the left of image center is the Cascade Reservoir, located about 100 km north of Boise and 80 km east of the Snake River. North is at the top, and the image is approximately 380 km across.

    In addition to the huge plumes traversing the mountains in the northern part of the image, smoke accumulating in the lower elevation canyons and plains is visible. This image was generated using data from the MISR camera that looks forward at a steep angle (70.5 degrees). The smoke is far more visible when viewed at this highly oblique angle than it would be in a conventional, straight-downward view. In creating this color composite, data from the blue and green MISR bands, acquired at 1.1-km spatial resolution, were digitally 'sharpened' using 275-m resolution data acquired in the red band.

    MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.

    For more information: http://www-misr.jpl.nasa.gov

  4. TRANSPORTATION CENTER--NORTHWESTERN UNIVERSITY Aviation Symposium: The Future for Aviation

    E-print Network

    Bustamante, Fabián E.

    TRANSPORTATION CENTER--NORTHWESTERN UNIVERSITY Aviation Symposium: The Future for Aviation April The Transportation Center has organized a special Aviation Symposium focusing on important aviation industry topics, Professor of Transportation at Northwestern University and former Director of the Transportation Center

  5. 77 FR 16211 - Availability of Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-20

    ...Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...seats on the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...SUPPLEMENTARY INFORMATION: The NWHI Coral Reef Ecosystem Reserve is a marine...

  6. 76 FR 77779 - Availability of Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-14

    ...Seats for the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...seats on the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve Advisory Council...SUPPLEMENTARY INFORMATION: The NWHI Coral Reef Ecosystem Reserve is a [[Page...

  7. 75 FR 1597 - Western Pacific Crustacean Fisheries; 2010 Northwestern Hawaiian Islands Lobster Harvest Guideline

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-12

    ...Fisheries; 2010 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine...Commerce. ACTION: Notification of lobster harvest guideline...annual harvest guideline for the commercial lobster fishery in the Northwestern Hawaiian...

  8. InnovatIon EngInEs at northwEstErn

    E-print Network

    Engman, David M.

    at the same time." Stephen Miller, PhD, Judy Gugenheim Research Professor of Microbiology-Immunology, Northwestern University Feinberg School of Medicine At Northwestern Medicine, our technologic drivers

  9. Three-Dimensional Seismic Study of Pluton Emplacement, Offshore Northwestern New Zealand

    E-print Network

    Seamons, Kent E.

    Three-Dimensional Seismic Study of Pluton Emplacement, Offshore Northwestern New Zealand Jason A Emplacement, Offshore Northwestern New Zealand Jason A. Luke Department of Geological Sciences Master of Science Detailed 3D seismic images of a volcano-plutonic complex offshore northwestern New Zealand

  10. Version: 1/1/2013 Page 1 Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Version: 1/1/2013 Page 1 Northwestern University Feinberg School of Medicine Northwestern Memorial University Feinberg School of Medicine ("Feinberg"), Northwestern Memorial HealthCare ("NMHC the individual policies of Feinberg, NMHC, or NMFF. These policies remain in effect and can be accessed at http://www.feinberg

  11. 2012 Requesta Refund Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012

    E-print Network

    Shahriar, Selim

    ©2012 Requesta Refund Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012 SES/CAESAR v. 9 Navigate to the CAESAR login page, http://www.northwestern.edu/caesar/, and sign in using your Net Services > Request a Refund. #12;©2012 Requesta Refund Page2 NorthwesternUniversity CAESAR/SES Updated:10

  12. Alaska Park Science, Volume 8, Issue 2 Recent Notable Floristic Records from Northwestern Alaska

    E-print Network

    Ickert-Bond, Steffi

    33 Alaska Park Science, Volume 8, Issue 2 Recent Notable Floristic Records from Northwestern Alaska By Carolyn Parker and Steffi Ickert-Bond Abstract Botanical surveys in northwesternAlaska, including Alaska have been documented for sev- eral rare species that link northwestern Alaska with the circumpolar

  13. Incidence of narcotic abuse during pregnancy in northwestern Ontario

    PubMed Central

    Kelly, Len; Guilfoyle, John; Dooley, Joe; Antone, Irwin; Gerber-Finn, Lianne; Dooley, Roisin; Brunton, Nicole; Kakegamuck, Kara; Muileboom, Jill; Hopman, Wilma; Cromarty, Helen; Linkewich, Barb; Maki, Jennifer

    2014-01-01

    Abstract Objective To document the incidence and outcomes of narcotic use during pregnancy in northwestern Ontario. Design Three-year prospective cohort study. Setting Sioux Lookout and surrounding communities in northwestern Ontario. Participants A total of 1206 consecutive births in a catchment area of 28 000 First Nations patients. Main outcome measures Incidence of narcotic use, and maternal and neonatal outcomes. Results Incidence of narcotic use in pregnancy has risen to 28.6% (P < .001) and incidence of neonatal abstinence syndrome has fallen to 18.0% of narcotic-exposed births (P = .003). Daily intravenous drug use is now a common pattern of abuse. Conclusion Narcotic abuse in pregnancy has dramatically increased in northwestern Ontario. Neonatal outcomes have improved as a result of a family medicine–based prenatal and obstetric program that includes a narcotic replacement and tapering program. PMID:25316764

  14. Middle Proterozoic compressional orogen in northwestern Canada

    NASA Astrophysics Data System (ADS)

    Cook, Frederick A.

    1988-08-01

    Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of compression can be accounted for. Although the Proterozoic stratigraphy in the subsurface is not well known, the cross sections are constrained essentially by seismic reflection geometry. Shortening occurred on subhorizontal detachment(s) that lie above the autochthonous (Hudsonian?) basement. Seismic reflection data from the area west of the major thin-skinned thrust structures show that the Proterozoic strata there can be traced for up to 100 km and are characterized by broad, open folds with wavelengths of 10 km or more. Uniform potential field anomalies and subhorizontal seismic reflections further indicate that there are no major crustal boundaries (such as sutures) in the area between the thrust belt and the Campbell uplift near Inuvik, Northwest Territories, that were associated with the thrusting. The detachment(s) that carried the folded and thrust faulted allochthons must therefore extend for a considerable distance to the northwest of the thrust belt. New deep crustal seismic reflection data from the Campbell uplift, however, show evidence for crustalpenetrating Proterozoic structures that dip northwestward and that were probably reactivated during late Paleozoic compression and Mesozoic extension. Taken together, the various data thus indicate that the area from Great Bear Lake to the Campbell uplift (about 400 km) is underlain by a mid-Proterozoic decollement above which the compressional deformation took place, and that the deformation extended to the north side of the present Campbell uplift where steeply north dipping structures indicate that the underlying autochthonous basement is characterized by a ramp structure that was probably associated with the southern edge of a Proterozoic basin.

  15. How does the Amur River discharge flow over the northwestern continental shelf in the Sea of Okhotsk?

    NASA Astrophysics Data System (ADS)

    Fujisaki, Ayumi; Mitsudera, Humio; Wang, Jia; Wakatsuchi, Masaaki

    2014-08-01

    The paths of the Amur River discharge on the continental shelf in the Sea of Okhotsk are still unknown despite their significance in transporting dissolved and particulate iron. In this study, we conduct a coupled ice-ocean simulation for the northern Sea of Okhotsk from June 1998 to September 2000 to answer the question: Does the Amur River discharge deposit materials to the pathway of the dense shelf water? In a series of numerical experiments, we identified two routes (the western and eastern routes) that could transport the river water more than 100 km offshore over the northwestern continental shelf. The two routes share the clockwise gyre in the Sakhalin Gulf and the northeastward flow on the northwestern continental shelf. These features are connected through the westward jet along the slope from the Sakhalin Gulf (the western route) and the northward transport over the shelf break canyon (the eastern route). The river water, the dense shelf water, and the easterly wind are in a fine geophysical balance for those features, and all are required for the formation of the two routes. The model results show that these unique joint effects in the Sea of Okhotsk allow the Amur River discharge to be effectively transported over the northwestern continental shelf, unlike a general river discharge that flows along the coast, and deposit materials into the pathway of the dense shelf water.

  16. Northwestern researchers develop new way to treat lymphoma without chemotherapy

    Cancer.gov

    A new study by Northwestern Medicine researchers shows that synthetic HDL nanoparticles killed B-cell lymphoma, the most common form of the disease, in cultured human cells, and inhibited human B-cell lymphoma tumor growth in mice. The nanoparticle appears to the cancerous lymphoma cell like a preferred meal -- natural HDL. But when the particle engages the cell, it actually plugs it up and blocks cholesterol from entering. Deprived of an essential nutrient, the cell eventually dies. Northwestern is home to the Robert H. Lurie Comprehensive Cancer Center.

  17. Diversity Applicant ~ Diversity Applicant ~ Diversity Applicant ~ Diversity Applicant ~ 02/13 Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    /13 Northwestern University Feinberg School of Medicine McGaw Medical Center of Northwestern University Visiting Description: Northwestern University Feinberg School of Medicine and the McGaw Medical Center of Northwestern for the supplemental application. Please refer to the Visiting student website for further information: http://www.feinberg

  18. Diversity Applicant ~ Diversity Applicant ~ Diversity Applicant ~ Diversity Applicant ~ 1/14 Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    /14 Northwestern University Feinberg School of Medicine McGaw Medical Center of Northwestern University Visiting Description: Northwestern University Feinberg School of Medicine and the McGaw Medical Center of Northwestern for the supplemental application. Please refer to the Visiting student website for further information: http://www.feinberg

  19. Ordovician acritarch assemblages from central and northwestern Saudi Arabia

    Microsoft Academic Search

    Monika Jachowicz

    1995-01-01

    A preliminary account of acritarch populations derived from three oil exploration boreholes in central and northwestern Saudi Arabia ranging in age from Tremadoc to early Ashgill is given. Comparisons are made with assemblages of similar age in North Africa and northwest Europe.

  20. New provincial records of skinks (Squamata: Scincidae) from northwestern Vietnam

    PubMed Central

    Pham, Anh Van; Le, Dzung Trung; Nguyen, Son Lan Hung; Ziegler, Thomas

    2015-01-01

    Abstract We report six new records of skinks from northwestern Vietnam: Eutropis macularius, Scincella devorator, S. monticola, S. ochracea, Sphenomorphus cryptotis and S. indicus. Our new findings increase the species number of skinks (Scincidae) to nine in Dien Bien Province and to 14 in Son La Province. We also provide additional natural history data of aforementioned species. PMID:25698899

  1. 6. SOUTHWEST SIDE PARTIAL ELEVATION OF NORTHWESTERN HALF OF THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. SOUTHWEST SIDE -PARTIAL ELEVATION OF NORTHWESTERN HALF OF THE BRIDGE, FROM THE NEW BRIDGE - Puente de la Marina, San Lorenzo-Florida & Cerro Gordo Neighborhoods, spanning Rio Grande de Loiza River at Narciso Varona-Suarez Street, San Lorenzo, San Lorenzo Municipio, PR

  2. NORTHWESTERN UNIVERSITY High-End High School Communication

    E-print Network

    Fishman, Barry

    in high school science classrooms. A mixture of quantitative and qualitative methods were employedNORTHWESTERN UNIVERSITY High-End High School Communication: Tool Use Practices of Students OF THE REQUIREMENTS for the degree DOCTOR OF PHILOSOPHY Field of Education and Social Policy -- Learning Sciences

  3. Novel poxvirus in big brown bats, northwestern United States.

    PubMed

    Emerson, Ginny L; Nordhausen, Robert; Garner, Michael M; Huckabee, John R; Johnson, Steven; Wohrle, Ron D; Davidson, Whitni B; Wilkins, Kimberly; Li, Yu; Doty, Jeffrey B; Gallardo-Romero, Nadia F; Metcalfe, Maureen G; Karem, Kevin L; Damon, Inger K; Carroll, Darin S

    2013-06-01

    A wildlife hospital and rehabilitation center in northwestern United States received several big brown bats with necrosuppurative osteomyelitis in multiple joints. Wing and joint tissues were positive by PCR for poxvirus. Thin-section electron microscopy showed poxvirus particles within A-type inclusions. Phylogenetic comparison supports establishment of a new genus of Poxviridae. PMID:23735421

  4. Community Health Clinics Northwestern University Feinberg School of Medicine

    E-print Network

    Chisholm, Rex L.

    Community Health Clinics Northwestern University Feinberg School of Medicine Students at the Feinberg School of Medicine have a wealth of opportunities to volunteer and provide community service patients, some of whom are immigrants. In addition, the Feinberg School of Medicine's Department of Family

  5. Page 1 of 4 Northwestern University Feinberg School of Medicine

    E-print Network

    Page 1 of 4 Northwestern University Feinberg School of Medicine Procurement Card Policies. This document was created as a supplement for the Feinberg School of Medicine (FSM) users and should be used Agreement for Feinberg School of Medicine. By signing this form, the Cardholder acknowledges that he/she has

  6. Technology-Driven, Highly-Scalable Dragonfly Topology Northwestern University

    E-print Network

    Tomkins, Andrew

    Technology-Driven, Highly-Scalable Dragonfly Topology John Kim Northwestern University Evanston, IL an efficient network. In this paper, we introduce the dragonfly topology which uses a group of high minimally routed packet traverses at most one global channel. By reducing global channels, a dragonfly

  7. Origin of mafic magmas beneath northwestern Tibet: Constraints from 230

    E-print Network

    Dunbar, Nelia W.

    of California-Los Angeles, 595 Charles Young Drive East, Los Angeles, California 90095-1567, USA N. W. Dunbar Volume 3, Number 11 16 November 2002 1065, doi:10.1029/2002GC000332 ISSN: 1525-2027 Copyright 2002, K. M., M. R. Reid, N. W. Dunbar, and W. C. McIntosh, Origin of mafic magmas beneath northwestern

  8. Northwestern Mexico as seen from the Gemini 9-A spacecraft

    NASA Technical Reports Server (NTRS)

    1966-01-01

    Northwestern Mexico as seen from the Gemini 9-A spacecraft during its 32nd revolution of the earth. Large peninsula is Baja California. Body of water at lower right is Pacific Ocean. Land mass at upper left is State of Sonora. Gulf of California separates Sonora from peninsula. Nose of spacecraft is at left and at right is open hatch of spacecraft.

  9. THE AGING EYE EYE INSTITUTE OF NORTHWESTERN MEDICINE

    E-print Network

    Engman, David M.

    and glaucoma. Ocular Stem Cell Research Program Through the Center for the Aging Eye, we plan to advanceCENTER FOR THE AGING EYE EYE INSTITUTE OF NORTHWESTERN MEDICINE The Center for the Aging Eye within the Eye Institute will unite and advance a group of translational researchers who are dedicated

  10. Northwestern University Library. Preservation Planning Program. Final Report.

    ERIC Educational Resources Information Center

    Bennett, Scott; And Others

    The result of a year-long study designed to establish a 5-year plan for preserving Northwestern University Library's collections, this report draws on preliminary task force reports to make 14 specific recommendations that will enable the library to meet its preservation challenge. The recommendations are presented in four clusters which address…

  11. Grimmia brittoniae, a rare moss endemic to northwestern Montana

    Microsoft Academic Search

    H. C. Greven; T. Spribille

    1999-01-01

    The rare moss Grimmia brittoniae Williams Mas recently rediscovered at its type locality and discovered at two additional locations, bringing the total number of known locations to four. This distinct moss is restricted to calcareous rock outcrops at low elevations in northwestern Montana, including areas threatened by past and present development. VA:IBN

  12. SKIN CANCER INSTITUTE THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE

    E-print Network

    Engman, David M.

    SKIN CANCER INSTITUTE THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE Melanoma The Most Lethal Form of Skin Cancer Although it accounts for less than five percent of skin cancer cases, melanoma causes more than 75 percent of skin cancer deaths. It is now estimated that one in every 55 people

  13. Estimating salinity to complement observed temperature: 2.Northwestern Atlantic

    E-print Network

    Estimating salinity to complement observed temperature: 2.Northwestern Atlantic W.C. Thacker a,, L This paper addresses the problem of estimating salinity for a large region in the Atlantic Ocean containing salinity to complement observed temperature: 1. Gulf of Mexico. Journal of Marine Systems. doi:10.1016/j

  14. Setting of alaskite bodies in the northwestern Adirondacks, New York

    Microsoft Academic Search

    Michael P. Foose; James D. Carl

    1977-01-01

    Precambrian alaskite in the northwestern Adirondacks, New York, is a widely distributed and distinctive rock unit. Overlying the alaskite are, successively, a sequence of calcitic and dolomitic marbles, a sequence of biotitic and granitic gneisses, and a second sequence of carbonate-rich units. At least three periods of folding have deformed these rocks and have produced complex hook-shaped and elliptical interference

  15. Accumulation rates and sediment deposition in the northwestern Mediterranean

    Microsoft Academic Search

    Z. Zuo; D. Eisma; R. Gieles; J. Beks

    1997-01-01

    As part of the EROS 2000 programme, sediment mixing and accumulation rates in the northwestern Mediterranean Sea were determined, applying the 210Pb dating method to a total of 49 boxcores, and the results from 29 sediment cores are presented here. On the basis of the results from the 49 sediment cores, an attempt was made to present a general picture

  16. Fall 2011 www.it.northwestern.edu Get Connected

    E-print Network

    Shahriar, Selim

    -journals, and more at the Library's extensive online resource site. Computer Labs http services and quick links to most services you will be using. NUIT Support Center http to consultant@northwestern.edu, chat with a consultant online, or visit a Laptop ER session (www

  17. Assessment of River Water Quality in Northwestern Greece

    Microsoft Academic Search

    Melina E. Kotti; Athanasios G. Vlessidis; Nicholaos C. Thanasoulias; Nicholaos P. Evmiridis

    2005-01-01

    The effect of land use patterns on river water quality was studied in three different river basins located in Epirus, Northwestern Greece. Studies were conducted from October 2000 to {September} 2001. During this period, the parameters chemical oxygen demand (COD), biological oxygen demand (BOD), NO2-, NO3-, NH4+ and PO43- were measured, employing standard methods of analysis. The results were subjected

  18. NORTHWESTERN UNIVERSITY Phase-Field Simulation of Solidification

    E-print Network

    Shkel, Andrei M.

    NORTHWESTERN UNIVERSITY Phase-Field Simulation of Solidification and Coarsening in Dendritic;3 ABSTRACT Phase-Field Simulation of Solidification and Coarsening in Dendritic Microstructures Larry Kenneth Aagesen, Jr. Phase-field models are used to simulate dendritic microstructures during solidifica- tion

  19. Internship Search Survey 2009 Northwestern University Career Services

    E-print Network

    Shull, Kenneth R.

    Internship Search Survey 2009 Northwestern University Career Services Collected from Student of 2012 91 Class of 2009 46 Class of 2013 2 The Internship Search Approximately, to how many internships did you apply? (N=516) 1-5 Internships 234 45.35% 6-10 Internships 96 18.6% When did you start your

  20. Firefuelclimate linkages in the northwestern USA during the Holocene

    E-print Network

    Whitlock, Cathy L.

    in the abundance of sedimentary charcoal found in lake and bog sediments. When analysed with pollen data-resolution charcoal records generally involves the decomposition of charcoal influx into (a) a slowly varying. In this study, 15 high-resolution charcoal records from the northwestern USA and associated pollen data were

  1. Composition and age of the crystalline basement in the northwestern part of the west Siberian oil-and-gas megabasin

    NASA Astrophysics Data System (ADS)

    Ivanov, K. S.; Koroteev, V. A.; Erokhin, Yu. V.; Shokalsky, S. P.; Sergeev, S. A.

    2014-12-01

    Primary data on material composition of epidote-garnet plagiogneisses from the crystalline basement of the Yangiyugan area (the northwestern part of West Siberia) are presented. It is found that plagiogneisses were formed over the substrate of leucocratic plagiogranites (trondhjemites) under the conditions of the amphibolites facies of metamorphism. The SHRIMP II U-Pb-dating of zircons showed that the igneous intrusion of plagiogranites proceeded during the Late Vendian (566 ± 3 Ma). Their metamorphism with the formation of plagiogneisses took place in the Early Ordovician (486 ± 4 Ma). The shows of powerful fluid-metasomatic processes of the transformation of rocks during the Carboniferous time are revealed.

  2. Effect of the Spanish Conquest on coastal change in Northwestern Peru.

    PubMed

    Belknap, Daniel F; Sandweiss, Daniel H

    2014-06-01

    When Francisco Pizarro and his small band of Spanish conquistadores landed in northern Peru in A.D. 1532 to begin their conquest of the vast Inca Empire, they initiated profound changes in the culture, language, technology, economics, and demography of western South America. They also altered anthropogenically modulated processes of shoreline change that had functioned for millennia. Beginning with the extirpation of local cultures as a result of the Spanish Conquest, and continuing through today, the intersection of demography, economy, and El Niño-driven beach-ridge formation on the Chira beach-ridge plain of Northwestern Peru has changed the nature of coastal evolution in this region. A similar event may have occurred at about 2800 calibrated y B.P. in association with increased El Niño frequency. PMID:24843118

  3. Effect of the Spanish Conquest on coastal change in Northwestern Peru

    PubMed Central

    Belknap, Daniel F.; Sandweiss, Daniel H.

    2014-01-01

    When Francisco Pizarro and his small band of Spanish conquistadores landed in northern Peru in A.D. 1532 to begin their conquest of the vast Inca Empire, they initiated profound changes in the culture, language, technology, economics, and demography of western South America. They also altered anthropogenically modulated processes of shoreline change that had functioned for millennia. Beginning with the extirpation of local cultures as a result of the Spanish Conquest, and continuing through today, the intersection of demography, economy, and El Niño-driven beach-ridge formation on the Chira beach-ridge plain of Northwestern Peru has changed the nature of coastal evolution in this region. A similar event may have occurred at about 2800 calibrated y B.P. in association with increased El Niño frequency. PMID:24843118

  4. Pit Distribution in Titan's Equatorial Region. Kimberly Adams and Donna M. Jurdy, Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL 60208 (kadams@earth.northwestern.edu).

    E-print Network

    Jurdy, Donna M.

    Pit Distribution in Titan's Equatorial Region. Kimberly Adams and Donna M. Jurdy, Northwestern@earth.northwestern.edu). Introduction: Cassini's Radar [1,2] imaged the surface of Titan through its thick atmosphere. Using of the T8 im- age, between two mountains [4]. The pits range in size up to 2 km in diameter. Pits on Titan

  5. Elemental chemistry as a tool of stratigraphic correlation: A case study involving lower Paleozoic Wajid, Saq, and Qasim formations in Saudi Arabia

    Microsoft Academic Search

    Mahbub Hussain

    2007-01-01

    Separated physically by a distance of over 1250km, two lower Paleozoic formations in Saudi Arabia, the Wajid Formation in the southwest and the Saq Formation in central and northwestern Saudi Arabia, are fairly similar in lithology (both are quartz arenite) and overall depositional environment; yet the exact stratigraphic relationship between these two formations is not adequately known. Based on seismic

  6. Sulfide geochemistry and genesis of Chouichia and Ain el Bey copper deposits in northwestern Tunisia

    NASA Astrophysics Data System (ADS)

    Slim-Shimi, N.; Moëlo, Y.; Tlig, S.; Lévy, C.

    1996-03-01

    The Chouichia and Ain el Bey copper veins that occur in the Eastern Atlas fold belt in northwestern Tunisia, are hosted in Upper Cretaceous-Paleogene sedimentary sequences in a regional transcurrent shear zone. Paragenetic assemblages were formed during four distinct stages all of which are separated by fracturing and brecciation: Stage 1 consists of low temperature siderite (160 180 °C) formation in association with pyrite, including framboidal pyrite and marcasite. Stage 2 includes pseudomorphing of marcasite by As-rich pyrite and arsenopyrite, and formation of chalcopyrite at higher temperatures (200 300 °C) from S-rich, Fe-Cu-bearing fluids; As contents in individual pyrite and arsenopyrite crystals increase markedly in the rims relative to the centers, thus indicating non-equilibrium conditions. Stage 3 involves fracturing and brecciation predating deposition of enargite, luzonite and tennantite at Ain el Bey, and famatinite and tetrahedrite at Chouichia, from As-Sb-Bi-bearing ore-forming fluids; tennantite-tetrahedrite series exhibit iron and copper-excess replacements in tetrahedral sites inter-related with Cu-Fe interactions (electron transfer). In Stage 4 fracturing was followed by calcite formation in voids. Comprehensive data was obtained from scanning electron microprobe (SEM) and microprobe chemical analyses of minerals, geothermometry using sulfur isotopes, As contents in arsenopyrite crystals and fluid inclusions in siderite and calcite, support an input of magmatic hydrothermal ore-forming fluids, although contamination by sedimentary sulfur were also identified.

  7. Heat flow from eastern Panama and northwestern Colombia

    USGS Publications Warehouse

    Sass, J.H.; Munroe, R.J.; Moses, T.H., Jr.

    1974-01-01

    Heat flows were determined at 12 sites in four distinct areas between longitude 77?? and 80??W in eastern Panama and northwestern Colombia. Evidently, most of the region is underlain by mafic oceanic crust so that the crustal radiogenic component of heat flow is very small (??? 0.1 ??cal cm-2 sec-1). Low heat-flow values (??? 0.7 ??cal cm-2 sec-1) in northwestern Colombia may reflect thermal transients associated with shallow subduction. The normal values (??? 1) at about 78??W are consistent with the mean heat flow from the western Caribbean and the Gulf of Mexico. At 80??W, a fairly high value of 1.8 may define the easterly limit of thermal transients due to Cenozoic volcanic activity in Central America. ?? 1974.

  8. Palaeontology and Zooarchaeology of Mezmaiskaya Cave (Northwestern Caucasus, Russia)

    Microsoft Academic Search

    Robin L. Burgess

    1996-01-01

    Over 6000 large mammal and numerous small vertebrate remains have been recovered from preliminary excavations at Mezmaiskaya Cave, situated at 1300–1350m above sea level in the northwestern foothills of the Caucasus Mountains. Most remains were recovered from layers containing Mousterian artefacts that date to the late Middle Pleniglacial (35,000bpand older). The faunal assemblage reflects a very low degree of weathering,

  9. Dynamics, Patterns and Causes of Fires in Northwestern Amazonia

    PubMed Central

    Armenteras, Dolors; Retana, Javier

    2012-01-01

    According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

  10. Geological mapping in northwestern Saudi Arabia using LANDSAT multispectral techniques

    NASA Technical Reports Server (NTRS)

    Blodget, H. W.; Brown, G. F.; Moik, J. G.

    1975-01-01

    Various computer enhancement and data extraction systems using LANDSAT data were assessed and used to complement a continuing geologic mapping program. Interactive digital classification techniques using both the parallel-piped and maximum-likelihood statistical approaches achieve very limited success in areas of highly dissected terrain. Computer enhanced imagery developed by color compositing stretched MSS ratio data was constructed for a test site in northwestern Saudi Arabia. Initial results indicate that several igneous and sedimentary rock types can be discriminated.

  11. Northwestern Mexico as seen from the Gemini 12 spacecraft

    NASA Technical Reports Server (NTRS)

    1966-01-01

    Area of northwestern Mexico as seen from the Gemini 12 spacecraft during its 16th revolution of the earth. View is looking northwest. Body of water in foreground is Gulf of California. Pacific Ocean is in background. Peninsula in center of picture is Baja California. States of Sonora (upper right) and Sinaloa (lower center) of Mexican mainland is in right foreground. City of Guaymas, Sonora, is near center of picture.

  12. Northwestern University Facility for Clean Catalytic Process Research

    SciTech Connect

    Marks, Tobin Jay [Northwestern University

    2013-05-08

    Northwestern University with DOE support created a Facility for Clean Catalytic Process Research. This facility is designed to further strengthen our already strong catalysis research capabilities and thus to address these National challenges. Thus, state-of-the art instrumentation and experimentation facility was commissioned to add far greater breadth, depth, and throughput to our ability to invent, test, and understand catalysts and catalytic processes, hence to improve them via knowledge-based design and evaluation approaches.

  13. Spatial relationships between swift foxes and coyotes in northwestern Texas

    Microsoft Academic Search

    Jan F. Kamler; Warren B. Ballard; Rickey L. Gilliland; Kevin Mote

    2003-01-01

    Abstract: Interspecific competition,among,canids can result in mortalities and spatial displacement,of smaller canids by larger canids. To investigate mortalities and spatial relationships of swift foxes ( Vulpes velox) and coyotes (Canis latrans), we captured and radio-tracked both species at Rita Blanca National Grasslands in northwestern Texas. At least 89% of swift fox mortalities were caused by coyotes, resulting in a relatively

  14. Factors affecting waterfowl use of constructed wetlands in northwestern Minnesota

    Microsoft Academic Search

    Douglas A. Leschisin; Gary L. Williams; Milton W. Weller

    1992-01-01

    Waterfowl pair and brood use of constructed wetlands was evaluated during 1980–81 on 4 Wildlife Management Areas in northwestern\\u000a Minnesota. Weekly ground counts of waterfowl were made at each of 109 wetlands during the April to mid-July nesting season\\u000a and correlated with physical, vegetative, and limnological characteristics. The number of pairs of the 10 most common waterfowl\\u000a species using the

  15. Aerosol composition in the drylands of Northwestern China

    Microsoft Academic Search

    Wang Ming-Xing; John W. Winchester; Li Shao-Meng

    1987-01-01

    Aerosols from far northwestern China have been investigated to characterize sulfur in relation to other elements in a northern hemisphere temperate latitude continental location remote form anthropogenic air pollution SO2 sources. The importance of sulfur associated with soil-derived particles relative to any independently-occurring airborne sulfate was emphasized in the study. The first can result either from chemical and biological processes

  16. Winter Prey Selection of Canada Lynx in Northwestern Montana

    Microsoft Academic Search

    JOHN R. SQUIRES; LEONARD F. RUGGIERO

    2007-01-01

    ABSTRACT The roles that diet and prey abundance,play in habitat selection of Canada,lynx (Lynx canadensis) in the contiguous,United States is poorly understood. From 1998–2002, we back-tracked radiocollared lynx (6 F, 9 M) for a distance of 582 km and we located 86 kills in northwestern Montana, USA. Lynx preyed on 7 species that included blue grouse (Dendragapus obscurus), spruce grouse

  17. Trade in Palm Products in North-Western South America

    Microsoft Academic Search

    Grischa Brokamp; Natalia Valderrama; Moritz Mittelbach; Anders S. Barfod; Maximilian Weigend

    More than 200 scientific publications and Internet sources dealing with trade in palm products in north-western South America\\u000a are reviewed. We focus on value chains, trade volumes, prices, and recent developments for some of the most important raw\\u000a materials derived from native palms. Trade in palm products takes place at local, regional, national, and international levels.\\u000a For local communities and

  18. Dynamics, patterns and causes of fires in Northwestern Amazonia.

    PubMed

    Armenteras, Dolors; Retana, Javier

    2012-01-01

    According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

  19. Childhood brucellosis in north-western Greece: A retrospective analysis

    Microsoft Academic Search

    E. Galanakis; K. L. Bourantas; S. Leveidiotou; P. D. Lapatsanis

    1996-01-01

    Fifty-two cases of childhood brucellosis which occurred in north-western Greece during the 15-year period 1979–1993, are reviewed. It is believed that they represent very closely the total incidence of the disease in the region which has a population of 100,000 children aged 0–14 years old. Brucellosis-affected children were almost exclusively from goat-or shepherd families and of both sexes and all

  20. The Heroic Age: A Journal of Early Medieval Northwestern Europe

    NSDL National Science Digital Library

    Published since 1998, this free, peer-reviewed online journal is "dedicated to the study of Northwestern Europe from the Late Roman Empire to the advent of the Norman Empire." To date, four issues have been published, all of which are available online. In addition to articles, each issue contains a forum, Website and book reviews, and a digest of recent archaeological news. The main site also offers a collection of related links.

  1. Abrupt changes of intermediate-water oxygen in the northwestern Pacific during the last 27 kyr

    NASA Astrophysics Data System (ADS)

    Ishizaki, Yui; Ohkushi, Ken'ichi; Ito, Takashi; Kawahata, Hodaka

    2009-04-01

    An oxygen minimum zone (OMZ) currently exists at intermediate water depths on the northern Japanese margin in the northwestern Pacific. The OMZ results largely from a combination of high surface-water productivity and poor ventilation of intermediate waters. We investigated the late Quaternary history (last 27 kyr) of the intensity of this OMZ using changes in benthic foraminiferal carbon isotopes and assemblages in a sediment core taken on the continental slope off Shimokita Peninsula, northern Japan, at a water depth of 975 m. The core was located well within the region of the present-day OMZ and high surface-water productivity. The benthic foraminiferal ?13C values, which indicate millennial-scale fluctuations of nutrient contents at the sediment-water interface, were 0.48‰ lower during the last glacial maximum (LGM) than during the late Holocene. These results do not indicate the formation of glacial intermediate waters of subarctic Pacific origin, but rather the large contribution of high-nutrient water masses such as the Antarctic Intermediate Water, implying that the regional circulation pattern during the LGM was similar to that of modern times. Benthic foraminiferal assemblages underwent major changes in response to changes in dissolved oxygen concentrations in ocean floor sediments. The lowest oxygen and highest nutrient conditions, marked by dysoxic taxa and negative values of benthic foraminiferal ?13C, occurred during the Bølling/Allerød (B/A) and Pre-Boreal warming events. Dysoxic conditions in this region during these intervals were possibly caused by high surface-water productivity at times of reduced intermediate-water ventilation in the northwestern Pacific. The benthic assemblages show dysoxic events on approx. 100- to 200-year cycles during the B/A, reflecting centennial-scale productivity changes related to freshwater cycles and surface-water circulation in the North Pacific.

  2. Northwestern University Department of Chemistry Professor Richard Van Duyne Research Group

    E-print Network

    Goddard III, William A.

    : Research Associate Job ID: 21172 Apply: http://www.northwestern.edu/hr/careers/ Job Summary: The proposed, and associated laboratory equipment. Specific Responsibilities: · Experimental spectroscopy; · Computer data

  3. 76 FR 77214 - Hawaii Crustacean Fisheries; 2012 Northwestern Hawaiian Islands Lobster Harvest Guideline

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-12

    ...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration RIN 0648-XA838 Hawaii Crustacean Fisheries; 2012 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

  4. Comparative petrology of arkosic sandstone lithofacies of Cowlitz, Spencer, and Yamhill Formations, northwest Oregon

    Microsoft Academic Search

    Van Atta

    1987-01-01

    Recent discovery (1979) and commercial production of natural gas in arkosic sandstone (Clark and Wilson sand, informal) of the Cowlitz Formation near Mist, Oregon, has stimulated interest in the sedimentology and stratigraphy of Narizian sandstones of northwestern Oregon and the Willamette lowlands. Petrographic study of arkosic sandstone in the lower part of the Cowlitz Formation in surface outcrops in Clatsop,

  5. Thickness of the upper and lower confining units of the Mississippi River alluvial aquifer in northwestern Mississippi

    USGS Publications Warehouse

    Arthur, J. Kerry

    1994-01-01

    The thickness of the upper and lower confining units of the Mississippi River alluvial aquifer in north- western Mississippi (the Delta) has a significant influence on the vertical recharge and contamination susceptibility of the aquifer. The upper confining unit is thicker in the southern part of the Delta, the upper confining unit is less than 10 feet thick in small areas in Bolivar, Coahoma, Sunflower, Quit- man, and Tallahatchie Counties. The lower confining units are characterized by the geologic units directly underlying the alluvial aquifer. The geologic units directly underlying the aquifer, from youngest to oldest, are the Jackson Group, Cockfield Formation, Cook Mountain Formation, Sparta Sand, and Zilpha Clay. The lower confining unit thickness is greatest (greater than 250 feet) in southern Issaquena and northwestern Warren Counties. The largest area where the lower confining unit is less than 10 feet thick is Quitman, southern Coahoma, western Panola, southern Tunica, and the northern one-half of Sunflower Counties.

  6. Ring Formation in Magnetically Subcritical Clouds and Multiple Star Formation

    E-print Network

    Zhi-Yun Li

    2001-05-02

    We study numerically the ambipolar diffusion-driven evolution of non-rotating, magnetically subcritical, disk-like molecular clouds, assuming axisymmetry. Previous similar studies have concentrated on the formation of single magnetically supercritical cores at the cloud center, which collapse to form isolated stars. We show that, for a cloud with many Jeans masses and a relatively flat mass distribution near the center, a magnetically supercritical ring is produced instead. The supercritical ring contains a mass well above the Jeans limit. It is expected to break up, through both gravitational and possibly magnetic interchange instabilities, into a number of supercritical dense cores, whose dynamic collapse may give rise to a burst of star formation. Non-axisymmetric calculations are needed to follow in detail the expected ring fragmentation into multiple cores and the subsequent core evolution. Implications of our results on multiple star formation in general and the northwestern cluster of protostars in the Serpens molecular cloud core in particular are discussed.

  7. Lithofacies Associations and Depositional Environments of the Neogene Molasse succession, Pishin Belt, northwestern Pakistan

    NASA Astrophysics Data System (ADS)

    Kasi, A.; Kassi, A.; Friis, H.; Umar, M.

    2013-12-01

    The Pishin Belt is a NE-SW trending mixed flysch and molasse basin, situated at the northwestern part of Pakistan, bordered by Afghan Block of the Eurasian Plate in the west and Indian Plate in the east. Western boundary of the belt is marked by the well-known Chaman Transform Fault, whereas the Zhob Valley Thrust and Muslim Bagh-Zhob Ophiolite mark the eastern boundary. The Belt is divisible into six tectono-stratigraphic zones bounded by major thrusts. Muslim Bagh-Zhob Ophiolite is the base and Zone-I of this belt. Zone-II comprises shallow marine and flysch successions of the Eocene Nisai Formation and Oligocene Khojak Formation. The Early to Middle Miocene Dasht Murgha group comprises Zone-III, the Late Miocene-Pliocene Malthanai formation comprises Zone-IV, the Pleistocene Bostan Formation makes Zone-V, and the flat-laying Holocene deposits of the Zhob Valley comprise Zone-VI. The Neogene molasse successions of the Pishin Belt include the Dasht Murgha group, Malthanai formation and Bostan Formation; these are mostly composed of sandstone, claystone and conglomerate lithologies. Sandstones have been classified as lithic arenites and their QFL values suggest quartzolithic composition. Twelve distinct lithofacies have been recognized in the succession and thus grouped into four types of facies associations. Lithofacies include clast-supported massive gravel (Gcm), clast-supported crudely bedded gravel (Gh), cross-stratified conglomerate (Gt and Gp), trough cross-stratified sandstone (St), planar cross-stratified sandstone (Sp), ripple cross-laminated sandstone (Sr), horizontally stratified sandstone (Sh), low-angle cross-stratified sandstone (Sl), massive sandstones (Sm), massive mudstone and siltstone (Fm) and paleosol carbonate (P). The lithofacies associations include channel facies association (CHA), crevasse-splay facies association (CSA), natural-levee facies association (LVA) and floodplain facies association (FPA). The lithofacies associations suggest that the Dasht Murgha group was deposited by a sandy braided to mixed-load high-sinuosity fluvial system, the Malthanai formation by a mixed-load high-sinuosity fluvial system and Bostan Formation by gravelly braided channels of a coalescing alluvial fan system. We propose that prolonged and continued collision of the Indian Plate with the Afghan Block of the Eurasian Plate resulted in the closure of the Katawaz Remnant Ocean (the southwestern extension of the Neo-Tethys) in the Early Miocene. Uplifted orogens of the Muslim Bagh-Zhob Ophiolite and marine successions of the Nisai and Khojak formations served as the major source terrains for the Miocene through Holocene molasse succession in the south and southeast verging successive thrust-bound foreland basins at the outer most extremity of the Pishin Belt.

  8. Contemporary radioecological state of the North-western Black Sea and the problems of environment conservation.

    PubMed

    Tereshchenko, N N; Mirzoyeva, N Yu; Gulin, S B; Milchakova, N A

    2014-04-15

    Review is devoted to the analysis of a radioecological situation in the North-western Black Sea and concerns the levels of contamination of the components of an ecosystem by the main artificial radioactive isotopes ((90)Sr, (137)Cs, (239,240)Pu). The long-term accumulation trends of these radionuclides were analyzed in components of the Black Sea ecosystem after the Chernobyl nuclear power plant accident. Zones that have an increased ability to accumulate these radioisotopes were revealed. The assessment of irradiation dose rates formed by (90)Sr, (137)Cs and (239,240)Pu in Black Sea hydrobionts was obtained. The strategy for biodiversity conservation and sustainable management of natural resources should include monitoring of the radioecological state of the marine ecosystems, and the formation of a complex of biogeochemical criteria for assessment of an ecological situation in the sea. This approach is important for marine protected areas, since it allows the formation of a basis for scientific and practical function. PMID:24461697

  9. Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern University. Argonne is a partner in the Center for Emergent Superconductivity led by Brookhaven National Laboratory.

    E-print Network

    Kemner, Ken

    Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern Conductivity (CES) W. Kwok (MSD) Argonne-Northwestern Solar Energy Research (ANSER) M. Pellin (MSD) #12; Administrative Support J. Hogan and G. Cutinello Chemical Sciences & Engineering (CSE) E.E. Bunel High Energy

  10. Geochemistry and genesis of the banded iron formations of the Cauê Formation, Quadrilátero Ferrífero, Minas Gerais, Brazil

    Microsoft Academic Search

    Carlos A. Spier; Sonia M. B. de Oliveira; Alcides N. Sial; Francisco J. Rios

    2007-01-01

    The Cauê Formation of the Paleoproterozoic Minas Supergroup hosts banded iron formations (BIFs), locally called itabirites, deposited in shallow marine passive margin settings. Two major compositional types of itabirite, dolomitic and quartz itabirites, are found in the northwestern part of QF. The former consists of alternating dolomite-rich and hematite-rich bands, whereas the latter is formed with alternating quartz-rich and hematite-rich

  11. Last Interglacial marine environments in the White Sea region, northwestern Russia

    E-print Network

    Ingólfsson, Ólafur

    , northwestern Russia. Boreas, Vol. 35, pp. 493Á520. Oslo. ISSN 0300-9483. Marine sediments from river sections in the Mezen River drainage, northwest Russia, have been analysed for dinoflagellate cysts, foraminifersLast Interglacial marine environments in the White Sea region, northwestern Russia KARI GRØSFJELD

  12. Mantle source provinces beneath the Northwestern USA delimited by helium isotopes in young basalts

    E-print Network

    Graham, David W.

    Mantle source provinces beneath the Northwestern USA delimited by helium isotopes in young basalts results for basalts from the northwestern United States. The new 3 He/ 4 He results for olivine phenocrysts in basalts from the eastern Snake River Plain (SRP), the Owyhee Plateau (OP) and the Oregon High

  13. Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta

    E-print Network

    Macdonald, Ellen

    Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta) on ectomycorrhizae (ECM) associated with white spruce (Picea glauca (Moench) Voss) in northwestern Alberta, Canada'épinette blanche (Picea glauca (Moench) Voss) dans le nord-ouest de l'Alberta, au Canada. Les traitements

  14. SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN MEXICO

    E-print Network

    Nacional Autónoma de México, Universidad

    SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN were collected from prairie dogs trapped in 7 plots (160 x 160 m) in 3 colonies of northwestern Mexico seasons Fig. 1. Prairie dog colony complex in Chihuahua, Mexico, as mapped in 2005. Focal colonies

  15. Predation on Released Spiny Lobster, Panulirus marginatus, During Tests in the Northwestern Hawaiian Islands

    E-print Network

    Predation on Released Spiny Lobster, Panulirus marginatus, During Tests in the Northwestern Fisheries Center's ABSTRACT-In the Northwestern Hawaiian Islands fishery for spiny lobster, Panulirus marginatus, undersized and ber- ried lobsters must be released. Such lobsters released in the conventional

  16. Manager of the Nikon Imaging Center at Northwestern University Feinberg School of Medicine, Chicago, IL, USA

    E-print Network

    Goldman, Robert D.

    Manager of the Nikon Imaging Center at Northwestern University Feinberg School of Medicine, Chicago, IL, USA The Feinberg School of Medicine at Northwestern University is seeking a Manager for its Nikon, TIRF and multiphoton microscopes. The center is supported by the Feinberg School of Medicine

  17. Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China

    E-print Network

    Fayek, Mostafa

    Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern Available online 25 January 2005 Abstract We show evidence that the primary uranium minerals, uraninite-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically

  18. Comparison of pollen and conifer stomates as indicators of alpine treeline in northwestern

    E-print Network

    Pisaric, Michael

    Comparison of pollen and conifer stomates as indicators of alpine treeline in northwestern Canadian compare fossil pollen and stomate assemblages in 29 lake sediment surface samples from mountainous regions in northwestern Canada to characterize the relationship between modern vegetation, and pollen and stomate de

  19. 1 What induced the exceptional 2005 convection event 2 in the northwestern Mediterranean basin?

    E-print Network

    Paris-Sud XI, Université de

    1961­2006 reproduces correctly the 16 longterm evolution of the Mediterranean Sea circulation, the EMT1 What induced the exceptional 2005 convection event 2 in the northwestern Mediterranean basin? 3 2010. 6 [1] Opensea convection occurring in the northwestern Mediterranean basin (NWMED) is 7

  20. Northwestern University Archives Evanston, Illinois Charles W. Pearson Family Papers, 1843-1968

    E-print Network

    Northwestern University Archives · Evanston, Illinois Charles W. Pearson Family Papers, 1843-1968 Series 11/3/11/2 Boxes 1-15 Introductory Note The Charles Pearson Family Papers document the life and career of Charles W. Pearson, Northwestern alumnus and faculty member (professor and department chair

  1. Policy for Reviewing Alleged Research Misconduct Policy Statement: It is the policy of Northwestern University to inquire

    E-print Network

    Shahriar, Selim

    community. Website Address for this Policy: http://www.research.northwestern.edu/ori/misconduct/ Contact of scholarly communities for accuracy, validity, and integrity in research. It is the policy of Northwestern community. Northwestern University's Policy for Reviewing Alleged Research Misconduct applies

  2. 2012 View MyAccount Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012

    E-print Network

    Shahriar, Selim

    ©2012 View MyAccount Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012 SES/CAESAR v. 9 to the CAESAR login page, http://www.northwestern.edu/caesar/, and sign in using your NetID and password Financial Services > View My Account. #12;©2012 View MyAccount Page2 NorthwesternUniversity CAESAR

  3. NORTHWESTERN NATURALIST 88:147154 WINTER 2007 A COMPARISON OF GROUND-BASED AND TREE-BASED

    E-print Network

    Johnson, Matthew

    -BASED POLYVINYL CHLORIDE PIPE REFUGIA FOR CAPTURING PSEUDACRIS REGILLA IN NORTHWESTERN CALIFORNIA CALE H MYERS the Pacific Treefrog (Pseudacris regilla) in northwestern California. We recorded a total of 464 P. regilla: Pacific Treefrog, Hyla regilla, Pseudacris regilla, polyvinyl chloride, pipe refugia, northwestern

  4. Potential particulate impacts at the Grand Canyon from northwestern Mexico.

    PubMed

    Eatough, D J; Green, M; Moran, W; Farber, R

    2001-08-10

    Project MOHAVE was a major air quality and visibility research program conducted from 1990 to 1999 to investigate the causes of visibility impairment in the Grand Canyon National Park region. At Meadview, a remote monitoring site just west of the Grand Canyon National Park, on September 1 and 2, 1992, the concentrations of sulfate (3.1 and 4.3 microg sulfate/m3) were the highest seen in 6 years of monitoring at this site. During this period, the concentrations of SO2 at Meadview were also abnormally high and approximately three times the sulfate concentrations, on a nmol/m3 basis. High concentrations of sulfate and SO2 extended south into southern Arizona and northwestern Mexico. Based on ambient atmospheric conditions, emissions from the Mohave Power Project (MPP) 110 km upwind of Meadview could not have been responsible for the majority of the regionally observed sulfur oxides. The geographical distribution of SO2 and sulfate, and available source information suggest that northwestern Mexico was a significant source of the unusually high observed sulfur oxides. A CMB model developed during Project MOHAVE was used to apportion sulfur oxides at Meadview and other sampling sites throughout the study region for August 31-September 2, 1992. The results indicate that the contribution of MPP to sulfate at Meadview was typical. However, the transport of SOx from northwestern Mexico was elevated throughout much of the region during this time period. This led to the large increase in sulfate concentrations at Meadview on September 1 and 2. These results indicate that emissions from Mexico can be a significant source of particulate material in the Grand Canyon. PMID:11516140

  5. Climate Change and Neotectonic History of Northwestern China

    NASA Technical Reports Server (NTRS)

    Farr, Tom G.; Chadwick, Oliver; Evans, Diane; Gillespie, Alan; Peltzer, Gilles; Tapponnier, Paul

    1996-01-01

    The progress, results and future plans for the following objectives are presented: (1) To compare the types, rates, and magnitudes of surficial modification processes that have operated in Northwest China and the Southwestern U.S.; (2) To quantify and understand the basis of the remote sensing signatures of these processes to allow extrapolation from field sites to regional maps and to allow comparisons between widely separated arid regions; (3) To use the resulting chronologies to help define the temporal and spatial distribution of continental climate changes; and (4) Determine the ages of movements on some of the active faults in Northwestern China.

  6. Revision of the Upper Cretaceous rudists from northwestern Peru

    NASA Astrophysics Data System (ADS)

    Philip, Jean; Jaillard, Etienne

    2004-09-01

    Revision of the Upper Cretaceous rudists of northwestern Peru has led to new discoveries and enabled the specification of their taxonomy and stratigraphic locations. Different species have been identified: Biradiolites cf. jamaicensis Trechmann 1924, Radiolites cf. macroplicatus Whitfield 1897, Praebarrettia sparcilirata (Whitfield, 1897) of Late Campanian age, and Macgillavryia nicholasi (Whitfield, 1897) of Middle-Late Maastrichtian age. During the Campanian and Maastrichtian, rudists of Peru show paleobiogeographic affinities with those of the Mexican and Caribbean domains. A paleogeographic route for rudist migrations may have existed at that time along the Caribbean arc and the Curaçao-Ecuador coastline.

  7. Seismicity of Northwestern Italy during the last 30 years

    NASA Astrophysics Data System (ADS)

    Scafidi, D.; Barani, S.; De Ferrari, R.; Ferretti, G.; Pasta, M.; Pavan, M.; Spallarossa, D.; Turino, C.

    2015-01-01

    The aim of this work is to describe the seismicity of Northwestern Italy from the very detailed picture provided by 30 years of accurate instrumental recordings coming from the Regional Seismic Network of Northwestern Italy (RSNI—University of Genoa). In an attempt to provide, for the first time, a comprehensive view of the seismicity in the area, this study describes the main characteristics of the database collected by the RSNI network. The seismicity is spread almost over the entire area, but it is mainly concentrated in the Northern Apennines and in the western sector of the Alps. The seismicity of the area is superficial: It is almost confined to the first 20 km of depth. Only a few deeper events are located in a small area southwest of the city of Turin, down to a depth of 80 km, and below the Northern Apennines down to 60-70-km depth. The majority of the earthquakes in this sector of the Italian peninsula are of low magnitude; nevertheless, the areas where the highest magnitude earthquakes took place during the last three decades are the Northern Apennines and the lower Piedmont, on land, and the Ligurian Sea, offshore. They are indeed the areas where the most damaging historical earthquakes have occurred, giving emphasis, if necessary, to the importance of continuous seismic monitoring.

  8. Early Mesozoic structure and stratigraphy of the northwestern Florida shelf

    SciTech Connect

    Reitz, B.K. (Conoco Inc., Houston, TX (United States))

    1991-03-01

    The pre-Mesozoic basement of the northwestern Florida shelf is composed of attenuated continental crust deformed during the late Triassic and Early Jurassic rifting of the Gulf of Mexico. Two distinct areas with different rift basin orientations are defined on the northwestern Florida shelf. The northeastern set of rifts has axes parallel to the rift basins of the Atlantic margin. The southwestern rift axes are orthogonal to the first set. These two areas are separated by an undisturbed northwest-southwest linear zone previously termed the Bahama fault zone. Margins of a major asymmetric rift basin, north of the Middle Ground arch, parallel the Bahamas fault zone. The asymmetric plan view and degree of crustal extension calculated for this basin suggests the Middle Ground arch formed by a counterclockwise rotation of 16{degree}. The geometries of the Upper Jurassic postrift sediments are related to rift morphology. Louann Salt updip limits are parallel to or coincident with the margins of the rift basins and the salt is thickest over the deepest portions of the rift basins. The distribution of Smackover-Haynesville and Cotton Valley Group sediments is strongly influenced by the underlying rift basins.

  9. Spatial variability of snow physical properties across northwestern Greenland

    NASA Astrophysics Data System (ADS)

    Courville, Z.; Polashenski, C.; Dibb, J. E.; Domine, F.

    2013-12-01

    In the late spring and early summer of 2013, researchers on the SAGE (Sunlight Absorption on the Greenland ice sheet Experiment) Traverse, embarked on a 4000 km ground traverse across northwestern Greenland in an attempt to quantify spatial variability of snow chemistry, snow physical properties, and snow reflectance. The field team targeted sites first visited by Carl Benson during his series of traverses from 1952 to 1955 as part of his pioneering work to characterize the Greenland Ice Sheet. This route now represents a rapidly changing and variable area of Greenland, as the route passes through several of the ice sheet facies first delimited by Benson. Along the traverse, the SAGE field team made ground-based albedo measurements using a hand-held spectroradiometer and collected snow physical property samples to determine snow specific surface area (SSA) from shallow, 2m pits. In addition, snow density and stratigraphy were measured. Snow layers in the near-surface and at the previous season's melt layer were targeted for sampling. Here we present preliminary snow physical property results from the upper portion of the snow pits and relate these to surface albedo data collected over the route. Further measurements of snow properties in the 2012 melt layer will be analyzed to assess the potential role of snow chemical (see Dibb et al. for a discussion of chemical analysis) and physical property driven albedo feedbacks could have played in contributing to that event. Route of 2013 SAGE Traverse in northwestern Greenland.

  10. Geogenic sources of local arsenic enrichment in groundwater from northwestern Thuringia, Germany

    NASA Astrophysics Data System (ADS)

    Abratis, Michael; Viereck, Lothar

    2014-05-01

    Aqueous fluids migrating in the Earth's crust interact with the host rocks and partially take up their geochemical signatures. Mineralization and sometimes geogenic contamination of the groundwater may be the consequence: The aquifer systems of the Lower Triassic Buntsandstein Formation, an important source of drinking water in north-western Thuringia, and the Rotliegend Formation are locally affected by elevated arsenic concentrations. Data from water wells locally show arsenic concentrations above the limit value for drinking water (10 ?g/L). The regional distribution as well as lack of secondary vein mineralizations or anthropogenic sources within this area point to a geogenic stratibound source of arsenic. The average concentration of the toxic, carcinogenic trace element arsenic in rocks of Phanerozoic rocks in Germany range from 5 to 12 ?g/g for different lithologies, being generally higher in Variscan rocks. However, it can be several times enriched in certain sedimentary lithologies such as pelites and even more so in coal beds. In our present study we investigate all sequences of the Buntsandstein and Rotliegend Formation with their different lithologies in order to identify the relevant carriers of arsenic. Geochemical analyses on samples from selected drill cores and outcrops show arsenic of >50 ?g/g especially in carbonaceous sediment sections as well as in primarily gray-green lacustrine clay stones. Elevated arsenic concentrations seem to be related to lithofacies of lacustrine origin in the Buntsandstein and carbonaceous sediment sections in the Rotliegend. Aim of the current study is now to identify the appropriate synsedimentary mineral phases that incorporate arsenic and to identify the processes and conditions under which arsenic is mobilized from these phases and transferred into the groundwater.

  11. Impacts of a gape limited Brook Trout, Salvelinus fontinalis, on larval Northwestern salamander, Ambystoma gracile, growth: A field enclosure experiment

    USGS Publications Warehouse

    Currens, C.R.; Liss, W.J.; Hoffman, R.L.

    2007-01-01

    The formation of amphibian population structure is directly affected by predation. Although aquatic predators have been shown to have direct negative effects on larval salamanders in laboratory and field experiments, the potential impacts of gape-limited fish on larval salamander growth has been largely underexplored. We designed an enclosure experiment conducted in situ to quantify the effects of gape-limited Brook Trout (Salvelinus fontinalis) on larval Northwestern Salamander (Ambystoma gracile) growth. We specifically tested whether the presence of fish too small to consume larvae had a negative effect on larval growth. The results of this study indicate that the presence of a gape-limited S. fontinalis can have a negative effect on growth of larval A. gracile salamanders. Copyright 2007 Society for the Study of Amphibians and Reptiles.

  12. Study of thunderstorm activity connection with weather system structures over the North-Western Pacific Ocean

    NASA Astrophysics Data System (ADS)

    Permyakov, M. S.; Cherneva, N. V.; Shevtsov, B. M.; Potalova, E. Yu.; Holzworth, Robert

    2014-11-01

    Applying the data of VLF direction finder receiving station of IKIR FEB RAS, included into the World Wide Lightning Location Network (WWLLN), the paper investigates the relations of field characteristics of recorded lightning discharges in the north-western part of the Pacific ocean with field characteristics of weather formation meteorological elements, evaluated according to the data of Earth remote sounding from satellites. On the example of separate tropical cyclones (TC) for 2012-2013, the relation of lightning discharge frequency and density with spatial distribution of driving wind whirl is shown. TC structure evolution is traced in cloudiness fields, driving wind whirl, and lightning discharge distribution. This publication is based on work supported by a grant from the U.S. Civilian Research and Development Foundation (RUG1-7084-PA-13) with funding from the United States Department of State. The opinions, findings and conclusions stated herein are those of the authors and do not necessarily reflect those of CRDF Global or the United States Department of State.

  13. Field methods to evaluate effects of pesticides on wildlife of the northwestern United States

    USGS Publications Warehouse

    Henny, C.J.

    1987-01-01

    Field .methods used to evaluate the impact of organochlorine and organophosphate pesticides on wildlife populations in the Pacific Northwest are reviewed. Five field studies, presented in a CASE HISTORY format, illustrate study designs .and thetypes of information collected. The pesticides investigated included DDT, heptachlor, endr1n, and famphur, and the species studied included the American kestrel (Falco sparverius), Canada goose (Branta canadensis}, black--crowned night-heron (Nycticorax nycticorac), and black-billed magpie (Pica pica). Wildlife biologists conducting field studies of pesticides encounter a variety of design and logistics problems. However, a number of procedures are now available to the researcher for field evaluations. The three principa1 types of insecticides (organochlorines (OC's), organophosphates (OP's) and carbamates (CB's) require different field approaches. In this paper, five field studies, conducted by my colleagues and me between 1974 and 1982, in the northwestern portion of the United States (Washington, Oregon, Idaho, and northern Nevada), are reviewed to illustrate procedures for evaluating the effects of these insecticides.on wildlife populations. Althought most OC pesticides were banned in the United States during the 1970's (.for review, see F1eming et al. 1983), we studied several OC applications, including the last major DDT spray project in 1974. Use of OP's and CB's increased during the 1970's and 1980s as the OC's were phased out.

  14. Perched groundwater at the northwestern coast of Egypt: a case study of the Fuka Basin

    NASA Astrophysics Data System (ADS)

    Yousif, Mohamed; Bubenzer, Olaf

    2012-03-01

    Perched groundwater resources on the northwestern coast of Egypt have thus far been little studied. However, if replenished by rainwater, they can provide a considerable amount of renewable water, i.e., for sustainable irrigation. These resources are limited, show different salinity contents and are endangered by overuse, pollution and by the sea level rising in the context of global warming. This paper presents new climatic data, geomorphologic, geologic, geochemical and hydrological researches in combination with remote sensing and GIS applications from Fuka Basin. Fuka constitutes a special synclinal basin where the interbedded limestone and clays have been folded into gentle synclinal structures. Fractured Middle Miocene limestone represents the bearing formation for the perched groundwater. According to the hydrogeochemical analysis and the PHREEQC model, the aquifer is recharged during the winter season by rainwater from the surrounding tableland and the chemical evolution of the perched water is attributed to water-rock interaction and mixing of fresh water with sea water. The salinity of the perched water ranges from 2,126 to 2,644 mg/L whereas for the deep groundwater it reaches 9,800 mg/L. The study explores origin and potential of the perched groundwater of Fuka Basin and gives recommendations for a future sustainable use and further investigations.

  15. Previously Unrecognized Ornithuromorph Bird Diversity in the Early Cretaceous Changma Basin, Gansu Province, Northwestern China

    PubMed Central

    Wang, Ya-Ming; O'Connor, Jingmai K.; Li, Da-Qing; You, Hai-Lu

    2013-01-01

    Here we report on three new species of ornithuromorph birds from the Lower Cretaceous Xiagou Formation in the Changma Basin of Gansu Province, northwestern China: Yumenornis huangi gen. et sp. nov., Changmaornis houi gen. et sp. nov., and Jiuquanornis niui gen. et sp. nov.. The last of these is based on a previously published but unnamed specimen: GSGM-05-CM-021. Although incomplete, the specimens can be clearly distinguished from each other and from Gansus yumenensis Hou and Liu, 1984. Phylogenetic analysis resolves the three new taxa as basal ornithuromorphs. This study reveals previously unrecognized ornithuromorph diversity in the Changma avifauna, which is largely dominated by Gansus but with at least three other ornithuromorphs. Body mass estimates demonstrate that enantiornithines were much smaller than ornithuromorphs in the Changma avifauna. In addition, Changma enantiornithines preserve long and recurved pedal unguals, suggesting an arboreal lifestyle; in contrast, Changma ornithuromorphs tend to show terrestrial or even aquatic adaptions. Similar differences in body mass and ecology are also observed in the Jehol avifauna in northeastern China, suggesting niche partitioning between these two clades developed early in their evolutionary history. PMID:24147058

  16. Previously unrecognized ornithuromorph bird diversity in the Early Cretaceous Changma Basin, Gansu Province, northwestern China.

    PubMed

    Wang, Ya-Ming; O'Connor, Jingmai K; Li, Da-Qing; You, Hai-Lu

    2013-01-01

    Here we report on three new species of ornithuromorph birds from the Lower Cretaceous Xiagou Formation in the Changma Basin of Gansu Province, northwestern China: Yumenornis huangi gen. et sp. nov., Changmaornis houi gen. et sp. nov., and Jiuquanornis niui gen. et sp. nov.. The last of these is based on a previously published but unnamed specimen: GSGM-05-CM-021. Although incomplete, the specimens can be clearly distinguished from each other and from Gansus yumenensis Hou and Liu, 1984. Phylogenetic analysis resolves the three new taxa as basal ornithuromorphs. This study reveals previously unrecognized ornithuromorph diversity in the Changma avifauna, which is largely dominated by Gansus but with at least three other ornithuromorphs. Body mass estimates demonstrate that enantiornithines were much smaller than ornithuromorphs in the Changma avifauna. In addition, Changma enantiornithines preserve long and recurved pedal unguals, suggesting an arboreal lifestyle; in contrast, Changma ornithuromorphs tend to show terrestrial or even aquatic adaptions. Similar differences in body mass and ecology are also observed in the Jehol avifauna in northeastern China, suggesting niche partitioning between these two clades developed early in their evolutionary history. PMID:24147058

  17. Regional-Scale Drivers of Forest Structure and Function in Northwestern Amazonia

    PubMed Central

    Higgins, Mark A.; Asner, Gregory P.; Anderson, Christopher B.; Martin, Roberta E.; Knapp, David E.; Tupayachi, Raul; Perez, Eneas; Elespuru, Nydia; Alonso, Alfonso

    2015-01-01

    Field studies in Amazonia have found a relationship at continental scales between soil fertility and broad trends in forest structure and function. Little is known at regional scales, however, about how discrete patterns in forest structure or functional attributes map onto underlying edaphic or geological patterns. We collected airborne LiDAR (Light Detection and Ranging) data and VSWIR (Visible to Shortwave Infrared) imaging spectroscopy measurements over 600 km2 of northwestern Amazonian lowland forests. We also established 83 inventories of plant species composition and soil properties, distributed between two widespread geological formations. Using these data, we mapped forest structure and canopy reflectance, and compared them to patterns in plant species composition, soils, and underlying geology. We found that variations in soils and species composition explained up to 70% of variation in canopy height, and corresponded to profound changes in forest vertical profiles. We further found that soils and plant species composition explained more than 90% of the variation in canopy reflectance as measured by imaging spectroscopy, indicating edaphic and compositional control of canopy chemical properties. We last found that soils explained between 30% and 70% of the variation in gap frequency in these forests, depending on the height threshold used to define gaps. Our findings indicate that a relatively small number of edaphic and compositional variables, corresponding to underlying geology, may be responsible for variations in canopy structure and chemistry over large expanses of Amazonian forest. PMID:25793602

  18. Regional-scale drivers of forest structure and function in northwestern amazonia.

    PubMed

    Higgins, Mark A; Asner, Gregory P; Anderson, Christopher B; Martin, Roberta E; Knapp, David E; Tupayachi, Raul; Perez, Eneas; Elespuru, Nydia; Alonso, Alfonso

    2015-01-01

    Field studies in Amazonia have found a relationship at continental scales between soil fertility and broad trends in forest structure and function. Little is known at regional scales, however, about how discrete patterns in forest structure or functional attributes map onto underlying edaphic or geological patterns. We collected airborne LiDAR (Light Detection and Ranging) data and VSWIR (Visible to Shortwave Infrared) imaging spectroscopy measurements over 600 km2 of northwestern Amazonian lowland forests. We also established 83 inventories of plant species composition and soil properties, distributed between two widespread geological formations. Using these data, we mapped forest structure and canopy reflectance, and compared them to patterns in plant species composition, soils, and underlying geology. We found that variations in soils and species composition explained up to 70% of variation in canopy height, and corresponded to profound changes in forest vertical profiles. We further found that soils and plant species composition explained more than 90% of the variation in canopy reflectance as measured by imaging spectroscopy, indicating edaphic and compositional control of canopy chemical properties. We last found that soils explained between 30% and 70% of the variation in gap frequency in these forests, depending on the height threshold used to define gaps. Our findings indicate that a relatively small number of edaphic and compositional variables, corresponding to underlying geology, may be responsible for variations in canopy structure and chemistry over large expanses of Amazonian forest. PMID:25793602

  19. Fluvial response to late Quaternary climatic fluctuations, central Kobuk Valley, northwestern Alaska

    SciTech Connect

    Ashley, G.M. (Rutgers Univ., New Brunswick, NJ (United States). Dept. of Geological Sciences); Hamilton, T.D. (U.S. Geological Survey, Anchorage, AK (United States))

    1993-09-01

    Much of northwestern Alaska remained unglaciated during the Pleistocene and thus offers a favorable setting for examining long-term records of high-latitude geological and biological change. Epiguruk, a large cut bank 3.5 km long and up to 36 m high on the Kobuk River south of the Brooks Range in eastern Beringia, exposes complex sedimentary successions representing cycles of upper quaternary alluviation and eolian sedimentation, downcutting, and soil formation. A rich record of plants and mammals is also preserved in the section. Deposits of fluvial channels and flood plains, eolian dunes, sand sheets, loess, and ponds, as well as organic soils (Histosols) are represented. Parallel-bedded fine sand and coarse silt couplets that commonly contain root structures, ripple cross-lamination, silt drapes are flood-plain sediments apparently deposited at the interface of fluvial and eolian environments. Multiple fluvial-to-eolian depositional sequences were caused by influx of eolian sediment to the river from intermittently active dune fields south of the Kobuk River. Alluviation in the Kobuk Valley was coeval with glaciation in the Brooks Range, whereas downcutting occurred during interstadials when dune stabilization limited sediment supply. The depositional model developed at Epiguruk may be useful in interpreting some of the widespread subhorizontally stratified late-glacial deposits of Europe and North America.

  20. Biostratigraphy of a Middle Miocene-Pliocene sequence from Cumarebo area, Falcon State, northwestern Venezuela

    SciTech Connect

    Giffuni, G. (INTEVEP, S.A., Caracas (Venezuela))

    1991-03-01

    The southern Caribbean region offers little in the way of continuous sequences for the late Neogene. An upward facies shallowing trend unfavorable for planktonic foraminifers and erosional truncation seems to be almost a rule for such sediments. A fairly complete sedimentary sequence mainly represented by clays, silts, and carbonate rocks from the Cumarebo region, Falcon State, northwestern Venezuela, was chosen to study the biostratigraphy of the late Neogene using foraminifers. More than one hundred surface samples were analyzed throughout. The study of foraminiferal fossil assemblages and other microfossils was also used to define paleoenvironments of deposition. Four formations are involved in this work. From base to top they are the Socorro, Caujarao, El Veral, and Tucupido. From the study of planktonic foraminifers, six biostratigraphic zones were recognized: Globorotalia mayeri Zone, Globorotalia menardii Zone, Globorotalia acostaensis Zone, Globorotalia humerosa Zone, Globorotalia margaritae Zone, and Globorotalia miocenica Zone. These zones indicate that the age of the sequence ranks from late middle Miocene to middle Pliocene. Generally speaking, with some variations, the paleoenvironments of the sequence show a shallowing trend from marine upper-middle bathyal to middle neritic. These results make an important contribution to the stratigraphy and geologic history of the Cumarebo area, which is related to the Agua Salada basin, and may help clarify the paleogeography and paleotectonic evolution of this region for petroleum exploration.

  1. Regional variability of factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific

    NASA Astrophysics Data System (ADS)

    Shiozaki, Takuhei; Ito, Shin-Ichi; Takahashi, Kazutaka; Saito, Hiroaki; Nagata, Toshi; Furuya, Ken

    2014-01-01

    Satellite imagery and oceanographic data collected between 2003 and 2009 were used to examine factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific. Consistent with the critical depth hypothesis, the spring bloom onsets coincided with the mixed layer depth (MLD) shoaling in the north of the Kuroshio extension and in Oyashio, where complex frontal physical structures and turbulence weakening, respectively, would be responsible for the MLD shoaling. In contrast, in the formation regions of the dense central mode water (D-CMW) and the transition region mode water (TRMW), bloom onsets coincided with possible turbulence weakening but not with MLD shoaling. The peak of chlorophyll a in the formation regions of the D-CMW (0.44 ± 0.23 mg m-3) and the TRMW (0.58 ± 0.34 mg m-3) were ca. 5 times lower than that in the Oyashio (2.54 ± 0.74 mg m-3), despite the fact that nitrate concentration during the prebloom period was high (˜10 µM) and MLDs became shallow enough at the bloom peak in all the three regions. These observations indicated that light conditions and nitrate concentration did not explain the regional variability in the magnitude of spring blooms. The bloom magnitude west of ca. 150°E and in the north Kuroshio extension was increased relative to that in the eastern region, suggesting a chemical property in the water delivered from the Okhotsk Sea that would influence the western bloom. Our results demonstrated that factors controlling the timing and magnitude of spring algal blooms depend on the physicochemical regime in the northwestern North Pacific.

  2. Structure and chemistry in the northwestern condensation of the Serpens molecular cloud core

    NASA Technical Reports Server (NTRS)

    Mcmullin, Joseph P.; Mundy, Lee G.; Wilking, Bruce A.; Hezel, T.; Blake, Geoff A.

    1994-01-01

    We present single-dish and interferometric observations of gas and dust in the core of the Serpens molecular cloud, focusing on the northwestern condensation. Single-dish molecular line observations are used to probe the structure and chemistry of the condensation while high-resolution images of CS and CH30H are combined with continuum observations from lambda = 1.3 mm to lambda = 3.5 cm to study the subcondensations and overall distribution of dust. For the northwestern condensation, we derive a characteristic density of 3 x 10(exp 5)/ cu cm and an estimated total mass of approximately 70 solar mass. We find compact molecular emission associated with the far-infrared source S68 FIRS 1, and with a newly detected subcondensation named S68 N. Comparison of the large-and small-scale emission reveals that most of the material in the northwest condensation is not directly associated with these compact sources, suggesting a youthful age for this region. CO J = 1 approaches 0 observations indicate widespread outflow activity. However, no unique association of embedded objects with outflows is possible with our observations. The SiO emission is found to be extended with the overall emission centered about S68 FIRS 1; the offset of the peak emission from all of the known continuum sources and the coincidence between the blueshifted SiO emission and blueshifted high-velocity gas traced by CO and CS is consistent with formation of SiO in shocks. Derived abundances of CO and HCO(+) are consistent with quiescent and other star-forming regions while CS, HCN, and H2CO abundances indicate mild depletions within the condensation. Spectral energy distribution fits to S68 FIRS 1 indicate a modest luminosity (50-60 solar luminosity), implying that it is a low-mass (0.5-3 solar mass) young stellar object. Radio continuum observations of the triple source toward S68 FIRS 1 indicate that the lobe emission is varying on timescales less than or equal to 1 yr while the central component is relatively constant over approximately 14 yr. The nature of a newly detected compact emission region, S68 N, is less certain due to the absence of firm continuum detections; based on its low luminosity (less than 5 solar luminosity) and strong molecular emission, S68 N may be prestellar subcondensation of gas and dust.

  3. Origin of arches in the northwestern Gulf of Mexico basin

    SciTech Connect

    Laubach, S.E.; Jackson, M.L.W. (Univ. of Texas, Austin (USA))

    1990-07-01

    The San Marcos and Sabine arches are prominent north- to northwest-trending basement uplifts in the northwestern Gulf of Mexico basin that may be late Mesozoic to Cenozoic foreland or intraplate folds rather than domes over plutons or buoyant basement blocks. These arches are subparallel to and contemporaneous with orogenic episodes in the northwest-trending fold-thrust belt of Mexico. Arch movement was also contemporaneous with rapid convergence between the North American and Pacific plates. Arch development in the gulf as a result of tectonic compression is plausible in view of increasing recognition of wide zones of foreland and intraplate deformation in continents. Current tectonic models of the development of the gulf inaccurately predict gradual, decelerating subsidence when these arches were most active.

  4. Hantavirus Infection in Humans and Rodents, Northwestern Argentina

    PubMed Central

    Levis, Silvana; Calderón, Gladys; Ramirez, Josefina; Bravo, Daniel; Lozano, Elena; Ripoll, Carlos; St. Jeor, Stephen; Ksiazek, Thomas G.; Barquez, Ruben M.; Enria, Delia

    2003-01-01

    We initiated a study to elucidate the ecology and epidemiology of hantavirus infections in northern Argentina. The northwestern hantavirus pulmonary syndrome (HPS)–endemic area of Argentina comprises Salta and Jujuy Provinces. Between 1997 and 2000, 30 HPS cases were diagnosed in Jujuy Province (population 512,329). Most patients had a mild clinical course, and the death rate (13.3%) was low. We performed a serologic and epidemiologic survey in residents of the area, in conjunction with a serologic study in rodents. The prevalence of hantavirus antibodies in the general human population was 6.5%, one of the highest reported in the literature. No evidence of interhuman transmission was found, and the high prevalence of hantavirus antibody seemed to be associated with the high infestation of rodents detected in domestic and peridomestic habitats. PMID:14519242

  5. Intoxication of nontarget wildlife with rodenticides in northwestern Kansas.

    PubMed

    Ruder, Mark G; Poppenga, Robert H; Bryan, John A; Bain, Matt; Pitman, Jim; Keel, M Kevin

    2011-01-01

    The perception of prairie dogs (Cynomys spp.) both as a nuisance species and a keystone species presents a significant challenge to land, livestock, and wildlife managers. Anticoagulant and nonanticoagulant rodenticides are commonly employed to control prairie dog populations throughout their range. Chlorophacinone, and to a lesser extent zinc phosphide, are widely used in northwestern Kansas for controlling black-tailed prairie dog (Cynomys ludovicianus) populations. Although zinc phosphide poisoning of gallinaceous birds is not uncommon, there are few published accounts of nontarget chlorophacinone poisoning of wildlife. We report three mortality events involving nontarget rodenticide poisoning in several species, including wild turkeys (Meleagris gallopavo), a raccoon (Procyon lotor), and an American badger (Taxidea taxus). This includes the first documentation of chlorophacinone intoxication in wild turkeys and an American badger in the literature. The extent of nontarget poisoning in this area is currently unknown and warrants further investigation. PMID:21270011

  6. The Idaho cobalt belt, northwestern United States — A metamorphosed Proterozoic exhalative ore district

    NASA Astrophysics Data System (ADS)

    Nold, J. L.

    1990-07-01

    In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine which produced copper-cobalt ore sporadically from the early 1900's until about 1960. The Iron Creek deposit at the southeast end of the belt has undergone greenschist fades, biotite zone metamorphism; zones of disseminated, veinlet and massive sulfides lie more or less parallel to bedding of quartzites and phyllites. The main ore minerals are chalcopyrite and cobaltiferous pyrite. Toward the northwest at the Blackpine mine, remobilization has concentrated most of the mineralization into relatively thin concordant and discordant veins containing chalcopyrite, pyrite and arsenopyrite. The cobalt is reported to occur within arsenopyrite. Further northwest at the Blackbird mine where the Yellowjacket formation has been metamorphosed to the lower amphibolite facies, zones of disseminated and coarse-grained vein ores lie approximately along the same stratigraphic zone. Chalcopyrite, cobaltite, arsenopyrite, pyrite and pyrrhotite are the dominant ore minerals. Up to 0.22 oz. Au/ton was present in some of the ore. In addition, tourmaline-bearing sedimentary rocks (tourmalinites) are associated with some of the Blackbird ores. The Salmon Canyon deposit at the northwest end of the belt has undergone upper amphibolite facies, sillimanite zone metamorphism. In these garnet-sillimanite gneisses, chalcopyrite is found as coarse blebs and cobaltite as large porphyroblastic crystals. Gold occurs in amounts up to 0.02 oz. Au/ton. Elsewhere in the world the two most similar districts are the cobalt-bearing portion of the Zambian-Zairian Copperbelt of central Africa where Proterozoic Roan sedimentary rocks contain stratiform copper-cobalt ore-bodies over a distance of more than 500 kilometers, and the Sheep Creek district of Meagher County, Montana, which contains strata-bound copper-cobalt mineralization. The Idaho cobalt belt is a strata-bound copper-cobalt district hosted by the Proterozoic Yellowjacket Formation and located in east-central Idaho within Lemhi County, approximately 40 kilometers west of Salmon, Idaho, northwestern United States (Fig. 1). Of the four main deposits described here (from southeast to northwest, the Iron Creek, Blackpine, Blackbird, and the Salmon Canyon deposits), the Blackbird mine is the most important in the district. It was discovered in 1893 and sporadically produced copper and cobalt until about 1960. The Yellowjacket Formation has undergone an increasing degree of metamorphism toward the northwest. The deposits are largely strata-bound in a belt over 50 km in length, strongly suggesting a syngenetic mode of origin. However, the proximity of the district to satellitic granitic plutons of the Idaho batholith has prompted many investigators to suggest an epigenetic hydrothermal origin (Anderson 1947 and Purdue 1975). Remobilization of some of the mineralization into veins at the Blackbird mine, where most of the previous work has been concentrated, has also suggested an epigenetic origin. A more district-wide view of the mineralization points to a strong degree of stratigraphic control.

  7. The Northwestern (Maghreb) boundary of the Nubia (Africa) Plate

    NASA Astrophysics Data System (ADS)

    Mauffret, Alain

    2007-01-01

    A study of the present compressional deformation of the Northwestern (Maghreb) Nubia (Africa) margin is derived from the analysis of more than 20,000 km of seismic profiles. In the western part the compression is distributed in a large zone with on-land compression in Algeria, mainly strike-slip deformation on the Algerian margin and folds and strike-slip faulting in Eastern Spain. In the middle of the Algerian margin, around Algiers, the evidences of compression become more obvious. In this area a ridge trending N-S that is interpreted as a middle to late Miocene spreading center interacted with the transpressional margin that trends E-W. North of the location of the Boumerdes-Zemmouri earthquake the oceanic crust is deformed by blind thrusts up to 60 km from the coast. These thrusts are south dipping and with the northward dipping thrusts located onshore form a wedge that maybe a positive flower structure at a crustal scale related to the right-lateral transpression of the margin. In the eastern part of the Northwestern (Maghreb) Nubia (Africa) Deformed Belt, off eastern Algeria and Tunisia, the deformation is more intense but limited to the north by the continental slope. Large late Miocene Tortonian folds are cut by the Messinian erosional surface but the present deformation is also evident. It is suggested that the deformation with a double vergence may be followed up to the north of Sicily. After the docking (18 Ma) of the Kabylies to the Africa Plate, the crust has been thinned and the Algerian Basin opened during the middle-late Miocene with an E-W direction. From the late Miocene to the Present the margin has been rethickened by transpression and uplifted.

  8. Estimating salinity to complement observed temperature: 2.Northwestern Atlantic

    NASA Astrophysics Data System (ADS)

    Thacker, W. C.; Sindlinger, L.

    2007-03-01

    This paper addresses the problem of estimating salinity for a large region in the Atlantic Ocean containing the Gulf Stream and its recirculation. Together with Part 1 [Thacker, W.C., 2007-this issue. Estimating salinity to complement observed temperature: 1. Gulf of Mexico. Journal of Marine Systems. doi:10.1016/j.jmarsys.2005.06.008.] dealing with the Gulf of Mexico, this reports on the first efforts of a project for developing world-wide capability for estimating salinity to complement expendable-bathythermograph (XBT) data. Such estimates are particularly important for this region, where the strong frontal contrasts render the task of assimilating XBT data into numerical models more sensitive to the treatment of salinity. Differences in salinity's co-variability with temperature and with longitude, latitude, and day-of-year from the northwestern part of the region with the Gulf Stream to the southeastern part more characteristic of the Sargasso sea suggested that the region be partitioned to achieve more accurate salinity estimates. In general, accuracies were better in the southeastern sub-region than in the more highly variable northwestern sub-region with root-mean-square estimation errors of 0.15 psu at 25 dbar and 0.02 psu at 300 dbar as compared with 0.35 psu and 0.50 psu, respectively, but in the southeast there was an unexpected error maximum around 1000 dbar where estimates were slightly less accurate than in the northwest. For pressures greater than 1400 dbar root-mean-square errors in both sub-regions were less than 0.02 psu.

  9. NOTIS-3 (Northwestern On-Line Total Integrated System): Technical Services Applications.

    ERIC Educational Resources Information Center

    Horny, Karen L.

    1978-01-01

    Northwestern University Library's locally developed automated support system, NOTIS, operational since 1970-71, is described in terms of its technical services aspects. Internal applications and relevance to projected national networking developments are considered. (Author)

  10. Evaluation Training at Northwestern (And Beyond?): Sages, Golden Ages, and Stages.

    ERIC Educational Resources Information Center

    Mark, Melvin M.

    2003-01-01

    Recounts the author's experiences as a graduate student in social psychology at Northwestern University at the time the training program for program evaluation was being established. Explains the importance of the early training for the evaluator's career. (SLD)

  11. NANOPOROUS NONOXIDIC MATERIALS FOR HYDROGEN PURIFICATION Mercouri G. Kanatzidis, Department of Chemistry, Northwestern University

    E-print Network

    Shull, Kenneth R.

    NANOPOROUS NONOXIDIC MATERIALS FOR HYDROGEN PURIFICATION Mercouri G. Kanatzidis, Department. Northwestern University Nanoscale Science & Engineering Center (NUNSEC) Award Number: EEC ­ 0647560 promising alternative sources of energy is hydrogen fuel cells. However, hydrogen must be purified

  12. [High energy physics research]: Annual performance report, December 1, 1991--November 30, 1992. [Northwestern Univ

    SciTech Connect

    Rosen, J; Block, M; Buchholz, D; Gobbi, B; Schellman, H; Buchholz, D; Rosen, J; Miller, D; Braaten, E; Chang, D; Oakes, R; Schellman, H

    1992-01-01

    The various segments of the Northwestern University high energy physics research program are reviewed. Work is centered around experimental studies done primarily at FNAL; associated theoretical efforts are included.

  13. 40 CFR 81.184 - Northwestern Connecticut Intrastate Air Quality Control Region.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...false Northwestern Connecticut Intrastate Air Quality Control Region. 81.184 Section 81...CONTINUED) DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES Designation of Air Quality Control Regions § 81.184...

  14. 40 CFR 81.184 - Northwestern Connecticut Intrastate Air Quality Control Region.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...false Northwestern Connecticut Intrastate Air Quality Control Region. 81.184 Section 81...CONTINUED) DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES Designation of Air Quality Control Regions § 81.184...

  15. Northwestern Charles Deering McCormick University Library Library of Special Collections

    E-print Network

    Northwestern Charles Deering McCormick University Library Library of Special Collections Evanston/21/1947 F. 41 T.S. Eliot to Jacques Maritain, 1927 - 1939 (5 TLS photocopies) F. 42 Antoinette Grunelius

  16. ATMOSPHERIC VOLATILE HYDROCARBON COMPOSITION AT FIVE REMOTE SITES IN NORTHWESTERN NORTH CAROLINA

    EPA Science Inventory

    The results of a study to measure the volatile hydrocarbon composition of the atmosphere at several sites in the southern Appalachian Mountains of northwestern North Carolina are presented. Ambient air was sampled repeatedly at five geographically and botanically different remote...

  17. Page 1 of 3 Northwestern University Guidelines Regarding Boundaries with Minors

    E-print Network

    Shahriar, Selim

    's "Reporting Suspected Child Abuse and Neglect" policy (http://policies.northwestern.edu/docs/Reporting_Child circumstances (i.e., in a public locker room with other adults present) being nude in the presence of minors

  18. Overwintering Physiology and Hibernacula Microclimates of Blanchard's Cricket Frogs at Their Northwestern Range Boundary

    E-print Network

    Swanson, David L.

    Overwintering Physiology and Hibernacula Microclimates of Blanchard's Cricket Frogs at Their Northwestern Range Boundary David L. Swanson1 and Seth L. Burdick1 Blanchard's Cricket Frogs (Acris crepitans freezing tolerance, glucose mobilization during freezing, and hibernacula microclimates of cricket frogs

  19. 76 FR 4551 - Hawaii Crustacean Fisheries; 2011 Northwestern Hawaiian Islands Lobster Harvest Guideline

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-26

    ...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XA159 Hawaii Crustacean Fisheries; 2011 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

  20. 78 FR 9327 - Hawaii Crustacean Fisheries; 2013 Northwestern Hawaiian Islands Lobster Harvest Guideline

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-08

    ...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XC453 Hawaii Crustacean Fisheries; 2013 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

  1. A Late Cretaceous (Maastrichtian) snake assemblage from the Maevarano Formation, Mahajanga Basin, Madagascar

    Microsoft Academic Search

    Thomas C. Laduke; David W. Krause; John D. Scanlon; Nathan J. Kley

    2010-01-01

    A Late Cretaceous (Maastrichtian) assemblage of snakes from the Maevarano Formation of the Mahajanga Basin, northwestern Madagascar, constitutes the only fossil record of snakes from the island. The assemblage, which lived in a highly seasonal, semi-arid climate, includes only archaic forms belonging to the Madtsoiidae and Nigerophiidae, and therefore no representatives of extant Malagasy clades. A large sample of exquisitely

  2. Paleobiology of the Mesoproterozoic-Neoproterozoic transition: the Sukhaya Tunguska Formation, Turukhansk Uplift, Siberia

    Microsoft Academic Search

    V. N. Sergeev; A. H. Knoll; P. Yu. Petrov

    1997-01-01

    Silicified carbonates of the latest Mesoproterozoic Sukhaya Tunguska Formation, northwestern Siberia, contain abundant and diverse permineralized microfossils. Peritidal environments are dominated by microbial mats built by filamentous cyanobacteria comparable to modern species of Lyngbya and Phormidium. In subtidal to lower intertidal settings, mat-dwelling microbenthos and possible coastal microplankton are abundant. In contrast, densely woven mat populations with few associated taxa

  3. Tycoons and contraband: informal cross-border trade in West Nile, north-western Uganda

    Microsoft Academic Search

    Kristof Titeca

    2012-01-01

    This article presents ethnographic evidence on the activities of the “tycoons” – large-scale cross-border contraband traders in north-western Uganda. It shows how engagement with state officials, but also integration in the broader community are two crucial aspects which explain the functioning of informal cross-border trade or “smuggling” in north-western Uganda. In doing so, it shows how, although there is a

  4. Satellite observations and estimates of surface flow in the northwestern Gulf of Mexico

    E-print Network

    Barron, Charlie Nelms

    1992-01-01

    -resolution surface flow fields over the northwestern Gulf. B. Experiment The Texas AkM University (TAMU) Satellite Ocean Analysis Research (SOAR) group and the United States Coast Guard (USCG) Research and Devel- opment Center conducted a surface flow experiment...SATELLITE OBSERVATIONS AND ESTIMATES OF SURFACE FLOW IN THE NORTHWESTERN GULF OF MEXICO A Thesis by CHARLIE NELMS BARRON JR. Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements...

  5. The carbon-isotopic composition of Proterozoic carbonates: Riphean successions from northwestern Siberia (Anabar Massif, Turukhansk Uplift)

    NASA Technical Reports Server (NTRS)

    Knoll, A. H.; Kaufman, A. J.; Semikhatov, M. A.

    1995-01-01

    Thick carbonate-dominated successions in northwestern Siberia document secular variations in the C-isotopic composition of seawater through Mesoproterozoic and early Neoproterozoic (Early to early Late Riphean) time. Mesoproterozoic dolomites of the Billyakh Group, Anabar Massif, have delta 13C values that fall between 0 and -1.9 permil versus PDB, with values in the upper part of the succession (Yusmastakh Formation) consistently higher than those of the lower (Ust'-Il'ya and Kotuikan formations). Consistent with available biostratigraphic and radiometric data, delta 13C values for Billyakh carbonates compare closely with those characterizing early Mesoproterozoic carbonates (about 1600-1200 Ma) worldwide. In contrast, late Mesoproterozoic to early Neoproterozoic limestones and dolomites in the Turukhansk Uplift exhibit moderate levels of secular variation. Only the lowermost carbonates in the Turukhansk succession (Linok Formation) have delta 13C values that approximate Billyakh values. Higher in the Turukhansk succession, delta 13C values vary from -2.7 to +4.6 permil (with outliers as low as -5.0 permil interpreted as diagentically altered). Again, consistent with paleontological and radiometric data, these values compare well with isotopic values from 1200 to 850 Ma successions elsewhere. Five sections measured in different parts of the Turukhansk basin show nearly identical patterns of variation, confirming that carbonate delta 13C correlates primarily with time and not facies. The Siberian sections illustrate the potential of integrated biostratigraphic and chemostratigraphic data in the intra- and interbasinal correlation of Mesoproterozoic and early Neoproterozoic rocks.

  6. Brittle tectonics within the Jurassic formations of the Ouarsenis culminating area, northwestern Algeria

    NASA Astrophysics Data System (ADS)

    Aïfa, Tahar; Zaagane, Mansour

    2014-08-01

    Brittle structures within the Ouarsenis culminating zone were studied in order to characterize the polyphased tectonics. Field observations revealed that the dominant structures are highly tilted. They are represented by faults and joints, shears, reverse or curvilinear, locally associated with gypsum intrusions. Field data analysis shows that large scale shear faults are localized within the limits of the structural entities. Two main tectonic phases, having affected the Ouarsenis culminating zone were identified: (i) A NW-SE oriented compressive phase, represented by the contacts marked out by in-depth reverse faults and folding, mainly located in the westernmost part of Sra Abdelkader, Rokba Atba and in the western part of Batha, Fartas and Belkeiret (thrusts), respectively. This phase was also identified in reverse and sinistral faulting within Sidi Djber at the easternmost part of Sra Abdelkader, and the Grand Pic and the southern massif of Belkheiret respectively. (ii) A NNE-SSW oriented compressive phase, characterized by dextral strike-slips, is located in the easternmost part of Sra Abdelkader and Rokba Atba. North of the Grand Pic, a sinistral ?N120° oriented shearing occurred, with a lateral slip reaching ?2 km. The examination and the data analysis show a major N110-120° oriented fault with a sinistral signature. This movement would be responsible for block rotations and tilts. Counterclockwise rotations of the paleostress of ?38° and ?43° from west to east of the Sra Abdelkader massif and from Belkeiret to Batha, Fartas blocks were recorded, respectively. This local change of the stress field is mainly due to a deformation controlled by the regional post-Miocene geodynamic system, possibly explained by the proposed model.

  7. New information on olenelline trilobites from the Early Cambrian Sekwi Formation, Northwestern Canada

    E-print Network

    Abe, Francine Reiko; Lieberman, Bruce S.; Pope, Michael C.; Dilliard, Kelly A.

    2010-08-16

    with accessioning specimens. Thanks to Canadian 154 Helicopters and Mountain River Outfitters who provided logistical assistance in the field and S. 155 Hasiotis, J. Murphy, and J. White who provided assistance collecting material. Thanks to T. 156 Karim who...

  8. 2012 SetUp DirectDeposit Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012

    E-print Network

    Shahriar, Selim

    ©2012 SetUp DirectDeposit Page1 NorthwesternUniversity CAESAR/SES Updated:10/25/2012 SES/CAESAR v 1 Navigate to the CAESAR login page, http://www.northwestern.edu/caesar/, and sign in using your Net Number field. Enter "1234". #12;©2012 SetUp DirectDeposit Page3 NorthwesternUniversity CAESAR/SES Updated

  9. Paleostress pattern and salt tectonics within a developing foreland basin (north-western Subhercynian Basin, northern Germany)

    NASA Astrophysics Data System (ADS)

    Brandes, Christian; Schmidt, Carolin; Tanner, David Colin; Winsemann, Jutta

    2013-11-01

    Analysing the paleostress field in sedimentary basins is important for understanding tectonic processes and the planning of drilling campaigns. The Subhercynian Basin of northern Germany is a perfect natural laboratory to study the paleostress field in a developing foreland basin. The simple layer-cake geometry of the basin-fill is dominated by several piercing and non-piercing salt structures. We derived the paleostress field from the orientation of fracture sets, faults, slickensides and stylolites. On a regional scale, the basin-fill is characterized by a horizontal compressional paleostress vector that is mainly NNE-SSW-oriented, which reflects the Late Cretaceous inversion phase in Central Europe. We show that the local paleostress field is distinctly perturbated due to the salt structures. Along the edge of the salt pillows, the maximum horizontal paleostress vector is deflected by up to 90° from the regional trend. In the case of the Elm salt pillow, it forms a radial pattern. Restoration of balanced cross-sections demonstrates at least 9 % of the shortening of the north-western part of the Subhercynian Basin was achieved by folding. The salt structures in the north-western Subhercynian Basin are the result of varying stress conditions. Initial extension in the Triassic caused first salt movements that prevailed during the Jurassic and Early Cretaceous. Most important is the Late Cretaceous contractional phase that shortened the diapirs and led to the formation of the salt pillows between diapirs due to detachment folding. We derive four main controlling factors for such salt-dominated contractional basins: (1) the wedge-shape basin-fill is the product of the dynamic load at the southern margin of the basin, (2) a basal salt layer fed the diapirs and acted as a detachment horizon during the later shortening, (3) detachment folding was the dominating deformation mechanism during contraction, and (4) the pre-existing diapirs controlled the position of the detachment folds.

  10. Gilda's Club Chicago at Northwestern University'sGilda's Club Chicago at Northwestern University's Robert H. Lurie Comprehensive Cancer CenterRobert H. Lurie Comprehensive Cancer Center

    E-print Network

    'AI CHI CHIH® : T'ai Chi Chih is a mix of meditation and movement that has been shown to reduce stress Awakenings 11:15-11:45am P3 NEW at PRENTICE! Journaling Journaling can be a form of meditation and stress Support, for the Whole Family the Whole Time Free music concert by Northwestern University medical

  11. Regional frontier exploration in Sinu basin, northwestern Colombia

    SciTech Connect

    Lindberg, F.A.; Ellis, J.M.; Dekker, L.L.

    1989-03-01

    In 1983, Gulf and Ecopetrol undertook a regional hydrocarbon evaluation of northwestern Colombia, during the course of which much of the Sinu basin was mapped by field geologists aided by low-altitude aerial photographs. Additional seismic and airborne radar data were acquired to assist in developing a regional structural model. The dominant structures of the Sinu basin were produced by westward-vergent thrust faults, which are offset on the order of 10 to 20 km by northwest-southeast-trending compartmental faults. Numerous mud volcanos are surface expressions of overpressured shales, which migrate upward along both thrust and strike-slip faults. Thrust faults are expressed, on the surface, by steep-sided, asymmetrical anticlines, which are separated by broad synclines filled with clastics shed during Tertiary thrusting. The extremely thick section of Tertiary sediments is dominated by shale but contains some potential reservoir sandstones. These resistive sandstones could be accurately mapped on the radar imagery and projected into the subsurface allowing traps to be better defined. Combining field geology with geologic interpretation of aerial photographs and radar images was very effective in developing a regional structural framework of the Sinu basin.

  12. Northwestern University Schizophrenia Data and Software Tool (NUSDAST)

    PubMed Central

    Wang, Lei; Kogan, Alex; Cobia, Derin; Alpert, Kathryn; Kolasny, Anthony; Miller, Michael I.; Marcus, Daniel

    2013-01-01

    The schizophrenia research community has invested substantial resources on collecting, managing and sharing large neuroimaging datasets. As part of this effort, our group has collected high resolution magnetic resonance (MR) datasets from individuals with schizophrenia, their non-psychotic siblings, healthy controls and their siblings. This effort has resulted in a growing resource, the Northwestern University Schizophrenia Data and Software Tool (NUSDAST), an NIH-funded data sharing project to stimulate new research. This resource resides on XNAT Central, and it contains neuroimaging (MR scans, landmarks and surface maps for deep subcortical structures, and FreeSurfer cortical parcellation and measurement data), cognitive (cognitive domain scores for crystallized intelligence, working memory, episodic memory, and executive function), clinical (demographic, sibling relationship, SAPS and SANS psychopathology), and genetic (20 polymorphisms) data, collected from more than 450 subjects, most with 2-year longitudinal follow-up. A neuroimaging mapping, analysis and visualization software tool, CAWorks, is also part of this resource. Moreover, in making our existing neuroimaging data along with the associated meta-data and computational tools publically accessible, we have established a web-based information retrieval portal that allows the user to efficiently search the collection. This research-ready dataset meaningfully combines neuroimaging data with other relevant information, and it can be used to help facilitate advancing neuroimaging research. It is our hope that this effort will help to overcome some of the commonly recognized technical barriers in advancing neuroimaging research such as lack of local organization and standard descriptions. PMID:24223551

  13. Northwestern University Schizophrenia Data and Software Tool (NUSDAST).

    PubMed

    Wang, Lei; Kogan, Alex; Cobia, Derin; Alpert, Kathryn; Kolasny, Anthony; Miller, Michael I; Marcus, Daniel

    2013-01-01

    The schizophrenia research community has invested substantial resources on collecting, managing and sharing large neuroimaging datasets. As part of this effort, our group has collected high resolution magnetic resonance (MR) datasets from individuals with schizophrenia, their non-psychotic siblings, healthy controls and their siblings. This effort has resulted in a growing resource, the Northwestern University Schizophrenia Data and Software Tool (NUSDAST), an NIH-funded data sharing project to stimulate new research. This resource resides on XNAT Central, and it contains neuroimaging (MR scans, landmarks and surface maps for deep subcortical structures, and FreeSurfer cortical parcellation and measurement data), cognitive (cognitive domain scores for crystallized intelligence, working memory, episodic memory, and executive function), clinical (demographic, sibling relationship, SAPS and SANS psychopathology), and genetic (20 polymorphisms) data, collected from more than 450 subjects, most with 2-year longitudinal follow-up. A neuroimaging mapping, analysis and visualization software tool, CAWorks, is also part of this resource. Moreover, in making our existing neuroimaging data along with the associated meta-data and computational tools publically accessible, we have established a web-based information retrieval portal that allows the user to efficiently search the collection. This research-ready dataset meaningfully combines neuroimaging data with other relevant information, and it can be used to help facilitate advancing neuroimaging research. It is our hope that this effort will help to overcome some of the commonly recognized technical barriers in advancing neuroimaging research such as lack of local organization and standard descriptions. PMID:24223551

  14. Survival of radiomarked canvasback ducklings in northwestern Minnesota

    USGS Publications Warehouse

    Korschgen, Carl E.; Kenow, Kevin P.; Green, William L.; Johnson, Douglas H.; Samuel, Michael D.; Sileo, Louis

    1996-01-01

    Duckling survival, an important factor affecting annual recruitment, has not been determined adequately for canvasbacks (Aythya valisineria). We investigated the magnitude, timing, and causes of mortality of canvasback ducklings from hatch to fledging at the Agassiz National Wildlife Refuge (NWR) in northwestern Minnesota during 1987-90. During the 4 years, 217 day-old ducklings were radiomarked and released in 52 broods. Another 141 ducklings were radiomarked at greater than or equal to 4weeks of age. Survival was estimated with the Kaplan-Meier nonparametric estimator and the Weibull parametric model. Most mortalities occurred within 10 days after hatch. Total brood loss occurred in 18 (85%) of 52 broods released. The primary sources of mortality were predation principally by mink (Mustela vison), and exposure to precipitation and cold temperature. For combined years, females had lower survival than males (P=0.03). If the disparate survival between sexes of canvasbacks observed in this study is representative of canvasbacks in their breeding range, this phenomenon contributes to reduced reproductive potential and the male-biased sex ratio of the species.

  15. Geosites inventory of the northwestern Tabular Middle Atlas of Morocco

    NASA Astrophysics Data System (ADS)

    El Wartiti, Mohamed; Malaki, Amina; Zahraoui, Mohamed; El Ghannouchi, Abdelilah; di Gregorio, Felice

    2008-07-01

    Across the northwestern Tabular Middle Atlas of Morocco there are many examples of landscapes, rocks and fossils that provide key evidence of a particular moment or period in Earth history. Such Earth heritage sites are important for educating the general public in environmental matters. They also serve as tools for demonstrating sustainable development and for illustrating methods of site conservation as well as remembering that rocks, minerals, fossils, soils, landforms form an integral part of the natural world. The significance of certain sites for aesthetic or tourism reasons is obvious. There are numerous geosites, which could contribute to effective exploitation of geotourism, often in conjunction with ecotourism. The strategy employed to such sites involves close consultation with all communities in the vicinity of the respective geosite and is not only aimed at tourism and education, but also at sustainable improvement of the infrastructure of the people of this area. Geological heritage sites, properly managed, can generate employment and new economic activities, especially in regions in need of new or additional sources of income.

  16. Fire Weather Index application in north-western Italy

    NASA Astrophysics Data System (ADS)

    Cane, D.; Ciccarelli, N.; Gottero, F.; Francesetti, A.; Pelfini, F.; Pelosini, R.

    2008-05-01

    Piedmont region is located in North-Western Italy and is surrounded by the alpine chain and by the Appennines. The region is covered by a wide extension of forests, mainly in its mountain areas (the forests cover 36% of the regional territory). Forested areas are interested by wildfire events. In the period 1997-2005 Piedmont was interested by an average 387 forest fires per year, covering an average 1926 ha of forest per year. Meteorological conditions like long periods without precipitation contribute to create favourable conditions to forest fire development, while the fire propagation is made easier by the foehn winds, frequently interesting the region in winter and spring particularly. The meteorological danger index FWI (Fire Weather Index) was developed by Van Wagner (1987) for the Canadian Forestry Service, providing a complete description of the behaviour of the different forest components in response to the changing weather conditions. We applied the FWI to the Piedmont region on warning areas previously defined for fire management purposes. The meteorological data-set is based on the data of the very-dense non-GTS network of weather stations managed by Arpa Piemonte. The thresholds for the definition of a danger scenarios system were defined comparing historical FWI data with fires occurred on a 5 years period. The implementation of a prognostic FWI prediction system is planned for the early 2008, involving the use of good forecasts of weather parameters at the station locations obtained by the Multimodel SuperEnsemble post-processing technique.

  17. Drought induces spruce beetle (Dendroctonus rufipennis) outbreaks across northwestern Colorado.

    PubMed

    Hart, Sarah J; Veblen, Thomas T; Eisenhart, Karen S; Jarvis, Daniel; Kulakowski, Dominik

    2014-04-01

    This study examines influences of climate variability on spruce beetle (Dendroctonus rufipennis) outbreak across northwestern Colorado during the period 1650 2011 CE. Periods of broad-scale outbreak reconstructed using documentary records and tree rings were dated to 1843-1860, 1882-1889, 1931-1957, and 2004-2010. Periods of outbreak were compared with seasonal temperature, precipitation, vapor pressure deficit (VPD), the Palmer Drought Severity Index (PDSI), and indices of ocean-atmosphere oscillation that include the El Niño Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO). Classification trees showed that outbreaks can be predicted most successfully from above average annual AMO values and above average summer VPD values, indicators of drought across Colorado. Notably, we find that spruce beetle outbreaks appear to be predicted best by interannual to multidecadal variability in drought, not by temperature alone. This finding may imply that spruce beetle outbreaks are triggered by decreases in host tree defenses, which are hypothesized to occur with drought stress. Given the persistence of the AMO, the shift to a positive AMO phase in the late 1990s is likely to promote continued spruce beetle disturbance. PMID:24933812

  18. Late Devonian conodonts and event stratigraphy in northwestern Algerian Sahara

    NASA Astrophysics Data System (ADS)

    Mahboubi, Abdessamed; Gatovsky, Yury

    2015-01-01

    Conodonts recovered from the Late Devonian South Marhouma section comprise 5 genera with 31 species (3 undetermined). The fauna establishes the presence of MN Zones 5, undifferentiated 6/7, 8/10 for the Middle Frasnian, the MN Zones 11, 12, 13 for the Upper Frasnian as well as the Early through Late triangularis Zones in the basal Famennian. The outcropping lithological succession is one of mostly nodular calcilutites alternating with numerous marly and shaly deposits, which, in the lower and upper part, comprise several dysoxic dark shale intervals. Among these the Upper Kellwasser horizon can be precisely dated and as such the presence of the terminal Frasnian Kellwasser Event is recognized for the first time in Algeria. Both the Middlesex and Rhinestreet Events cannot yet be precisely located, but supposedly occur among the dark shale horizons in the lower part of the section. However, their assignment to a precise level has so far not been established. Though poor in conodont abundance the South Marhouma section provides first evidence of the presence of several Montagne Noire conodont zones within the so far widely unstudied Frasnian of the Ougarta Chain. As such it is considered representative for the northwestern Algerian Saoura region.

  19. Epiguruk: a late Quaternary environmental record from northwestern Alaska

    USGS Publications Warehouse

    Hamilton, T.D.; Ashley, G.M.

    1993-01-01

    Epiguruk, a prominent bluff along the Kobuk River in northwestern Alaska, exposes a rich depositional record of Quaternary eolian and fluvial sand, with associated loess, paleosols, and periglacial features. Three major complexes of alluvial and eolian deposits are separated by two conspicuous organic-rich paleosols which formed during cool-moist interstadial intervals. Sediments between the two paleosols include eolian, channel, and floodplain deposits that formed during alluviation of the Kobuk River to a height of about 12m above the present level. The youngest depositional complex, which overlies the upper paleosol, is divisible into late Wisconsinan and Holocene components and into fluvial-channel, flood-plain, eolian-dune, sand-sheet, loess, and pond facies. Eolian sand from the active Kobuk sand sea overloaded the river during late Wisconsinan time, causing it to alluviate to about 13m above its modern level. The Holocene record reflects erosion and deposition by a small southern Tributary to the Kobuk River, downcutting by the Kobuk River toward its modern level, and subsequent erosion across a meander belt nearly 8km wide. 66 radiocarbon ages, many from rooted shrubs, provide a firm chronology for the past 35 k.y. at Epiguruk. -from Authors

  20. Northwestern song sparrow populations show genetic effects of sequential colonization.

    PubMed

    Pruett, Christin L; Winker, Kevin

    2005-04-01

    Two genetic consequences are often considered evidence of a founder effect: substantial loss in genetic diversity and rapid divergence between source and founder populations. Single-step founder events have been studied for these effects, but with mixed results, causing continued controversy over the role of founder events in divergence. Experiments of serial bottlenecks have shown losses of diversity, increased divergence, and rapid behavioural changes possibly leading to reproductive isolation between source and final populations. The few studies conducted on natural, sequentially founded systems show some evidence of these effects. We examined a natural vertebrate system of sequential colonization among northwestern song sparrows (Melospiza melodia). This system has an effectively linear distribution, it was probably colonized within the last 10,000 years, there are morphological and behavioural differences among populations, and the westernmost populations occur in atypical habitats for the species. Eight microsatellite loci from eight populations in Alaska and British Columbia (n = 205) showed stepwise loss of genetic diversity, genetic evidence for strong population bottlenecks, and increased population divergence. The endpoint population on Attu Island has extremely low diversity (H(E) = 0.18). Our study shows that sequential bottlenecks or founder events can have powerful genetic effects in reducing diversity, possibly leading to rapid evolutionary divergence. PMID:15813781

  1. Mountain goat response to hydroelectric exploration in northwestern British Columbia

    SciTech Connect

    Foster, B.R.; Rahs, E.Y.

    1983-03-01

    The behavioral responses of more than 800 mountain goats, comprised of 195 social groups, were recorded during hydroelectric exploration activities (primarily aircraft) in northwestern British Columbia. Four categories of overt response were recorded during case tests, ranging from maintenance activity to severe flight. More than 80 percent (n=667) of the observed goats elicited some form of behavioral stress-response, with 33 percent (n=265) displaying a severe flight response to local rock or plant cover. Multiple regression analysis inferred goat responses to be statistically independent of the time of year, type, and vertical orientation of disturbance and group size. As expected, significant correlations (p less than or equal to 0.05) existed between distance of disturbance, geographic area, cover availability, and degree of awareness. Responses were stimulated primarily by auditory and secondarily by visual cues. Repeated aerial and ground follow-up surveys documented temporary range abandonment and changing observability indices (habitat use and activity patterns) associated with areas of intense exploration activity. The assessed data offer mitigation possibilities and enable formulation of management guidelines to lessen project impacts during future exploration, construction, and operation phases.

  2. Geomorphic surfaces in the northwestern Klamath Mountains, California and Oregon

    SciTech Connect

    Baldwin, K.S. (Forest Service, Happy Camp, CA (United States)); Ricks, C.L. (Forest Service, Gold Beach, OR (United States))

    1993-04-01

    Thick, residual, colluvial and alluvial soils derived from ophiolitic rocks mantle at least four geomorphic surfaces in the Siskiyou and marble mountains, in northwestern California and Illinois Valley, in southwestern Oregon. Analysis of digital elevation data provides constraints on the distribution and origin of these surfaces. Because of the geomorphic expression and soil mechanical properties of the surfaces, a map of slope gradients less than 22 degrees closely approximates the distribution of geomorphic surfaces as they are known from field observations. Preliminary definition of individual surfaces is based upon classification of the slop-map by elevation ranges. The Klamath Peneplain'' of Diller (1902) and associated soils, recently referred to as Klamath Saprolite'', are recognized near summit elevation (1,500 meters) across the area. Regional uplift and erosion has resulted in extensive, large earthflow landslides derived from these soils. Alluvial and residual deposits on the floor of the Illinois Valley occur at the same elevation (300 meters) as incised alluvial and colluvial terrace deposits along the Klamath River and tributary streams. At least two additional surfaces have been identified in the Siskiyou and Marble Mountains at approximately elevation 750 and 1,000 meters. Analysis of digital elevation data, combined with the map of earthflow landslides, allows rapid preliminary mapping of geomorphic surfaces in this terrain.

  3. Hydrogeologic framework of the Maku area basalts, northwestern Iran

    NASA Astrophysics Data System (ADS)

    Asghari Moghaddam, Asghar; Fijani, Elham

    2009-06-01

    The Maku area in northwestern Iran is characterized by young lava flows which erupted from Mount Ararat in Turkey. These fractured volcanic rocks overlie alluvium associated with pre-existing rivers and form a good basalt-alluvium aquifer over an area of 650 km2. Groundwater discharge occurs from 12 large springs, ranging from 20 to 4,000 L s-1, and from some extraction wells. Permian and Oligo-Miocene age limestones along the northern boundary of the Bazargan and Poldasht Plains basalts are intensively karstified and groundwater from these high lands easily enters the basalt-alluvium aquifers. The transmissivity of the basalt-alluvium aquifer ranges from 24 to 870 m2 d-1, indicating heterogeneity. Groundwater of the aquifer is a sodium-bicarbonate and mixed cation-bicarbonate type and the concentration of fluoride is higher than the universal maximum admissible concentrations for drinking. In order to determine the chemical composition and identify the source of the high fluoride concentrations in the groundwater of the basaltic area, water samples from the springs, wells and rivers were analyzed. The results indicate that the high fluoride water enters the study area from the Sari Su River.

  4. Organic matter diagenesis and hydrocarbon generation on outer Continental Margin of northwestern Australia

    SciTech Connect

    Meyers, P.A.; Snowdon, L.R.; Heggie, D.; Bent, A.

    1989-03-01

    Organic geochemical analyses of sediments and rocks obtained from drill sites on the Exmouth and Wombat Plateaus and the Argo Abyssal Plain on the northwestern margin of Australia were done onboard the JOIDES Resolution during Ocean Drilling Program Legs 122 and 123. These analyses provide information about the sources of organic matter to these offshore locations from Triassic to Holocene times and also indicate the degree of postdepositional diagenesis and maturation the organic matter has experienced. Because this margin has interest to petroleum explorationists, these data have practical as well as fundamental significance. Triassic claystones (equivalent to the onshore Mungeroo Formation) from the Wombat Plateau contain up to several percent of land-derived organic carbon. Neocomian siltstones and claystones (equivalent to the Barrow Group and Muderong Shale) from the Exmouth Plateau hold similar organic matter but at lower concentrations. Younger sediments are generally very lean in organic matter. Gas chromatographic analysis of extractable hydrocarbons shows a large and often dominant contribution of continental components, notably n-alkanes with a strong odd/even ratio and tricyclic diterpanes. Both Rock-Eval and hydrocarbon results agree in indicating low to moderate levels of thermal maturity. Locations on the Exmouth Plateau typically contain large amounts of thermogenic gaseous hydrocarbons dominated by methane. Concentrations peak in Senonian chalk sequences. In Neocomian siltstones and claystones, methane-ethane ratios diminish as concentrations decrease. The source of these hydrocarbons is likely to be the Triassic coals and coaly material below the Dingo claystone, which was not drilled during these legs but has been characterized from industry wells on this passive margin.

  5. Mafic alkalic magmatism in central Kachchh, India: a monogenetic volcanic field in the northwestern Deccan Traps

    NASA Astrophysics Data System (ADS)

    Kshirsagar, Pooja V.; Sheth, Hetu C.; Shaikh, Badrealam

    2011-07-01

    Magmatism in Kachchh, in the northwestern Deccan continental flood basalt province, is represented not only by typical tholeiitic flows and dikes, but also plug-like bodies, in Mesozoic sandstone, of alkali basalt, basanite, melanephelinite and nephelinite, containing mantle nodules. They form the base of the local Deccan stratigraphy and their volcanological context was poorly understood. Based on new and published field, petrographic and geochemical data, we identify this suite as an eroded monogenetic volcanic field. The plugs are shallow-level intrusions (necks, sills, dikes, sheets, laccoliths); one of them is known to have fed a lava flow. We have found local peperites reflecting mingling between magmas and soft sediment, and the remains of a pyroclastic vent composed of non-bedded lapilli tuff breccia, injected by mafic alkalic dikes. The lapilli tuff matrix contains basaltic fragments, glass shards, and detrital quartz and microcline, with secondary zeolites, and there are abundant lithic blocks of mafic alkalic rocks. We interpret this deposit as a maar-diatreme, formed due to phreatomagmatic explosions and associated wall rock fragmentation and collapse. This is one of few known hydrovolcanic vents in the Deccan Traps. The central Kachchh monogenetic volcanic field has >30 individual structures exposed over an area of ˜1,800 km2 and possibly many more if compositionally identical igneous intrusions in northern Kachchh are proven by future dating work to be contemporaneous. The central Kachchh monogenetic volcanic field implies low-degree mantle melting and limited, periodic magma supply. Regional directed extension was absent or at best insignificant during its formation, in contrast to the contemporaneous significant directed extension and vigorous mantle melting under the main area of the Deccan flood basalts. The central Kachchh field demonstrates regional-scale volcanological, compositional, and tectonic variability within flood basalt provinces, and adds the Deccan Traps to the list of such provinces containing monogenetic- and/or hydrovolcanism, namely the Karoo-Ferrar and Emeishan flood basalts, and plateau basalts in Saudi Arabia, Libya, and Patagonia.

  6. The carbon dioxide system in the deep convection region of the Gulf of Lions (northwestern Mediterranean).

    NASA Astrophysics Data System (ADS)

    Vidal, Montserrat; Flos, Jordi; Galindo, Máxim; Emelianov, Mikhail; Padin, Xoxe Antonio; Ramos, Antonio G.

    2010-05-01

    The Gulf of Lions in the northwestern Mediterranean Sea is one of the few regions in the world where open ocean deep convection occurs. Convective mixing leads to deep water formation and to the development of a late winter - early spring phytoplankton bloom after stratification. Despite its likely influence on carbon fluxes, whether this process contributes to a sink/source of atmospheric CO2 has not been elucidated yet. Here we report on the distribution of the variables of the carbon dioxide system in the region of deep convection located around 41.5° N 4° E in the NW Mediterranean Sea. Sampling was done in late winter - early spring (March 4 to 24), spring (April 28 to May 15) and late summer (September 13 to 23). Continuous measurements of temperature, salinity, pH and partial pressure of CO2 in surface water were performed all along the surveys. A number of stations (12, 14 and 9, respectively for each one of the surveys) were sampled. CTD and rossete casts reached down to the bottom (about 2000 m) and collected water samples from 12 depths for pH, alkalinity and dissolved inorganic carbon analysis. We found variability in the distributions of pH (7.89 - 8.03), alkalinity (2540 - 2580 ?mol kg-1) and dissolved inorganic carbon concentrations (2200 - 2400 ?mol kg-1). This variability is related to the distribution of different water masses in the area and to biological processes. The partial pressure of CO2 ranged between 304 and 435?atm in surface water, depending on the season. Surface waters were undersaturated in CO2 in late winter and spring, indicating a transfer of CO2 from the atmosphere to the sea during these periods.

  7. Hydrogeology of northwestern Nassau and northeastern Queens Counties, Long Island, New York

    USGS Publications Warehouse

    Swarzenski, Wolfgang V.

    1964-01-01

    A detailed investigation of the geology and ground-water occurrence in northwestern Nassau and northeastern Queens Counties, N.Y., has been completed by the U.S. Geological Survey, in cooperation with the Nassau County Department of Public Works and the New York State Water Resources Commission. The area, about 63 square miles, includes the peninsulas of Great Neck and Manhasset Neck and the western part of Nassau County as far south as Garden City. Unconsolidated sediments of Pleistocene and Cretaceous aged 200 to 800 feet thick, constitute the ground-water reservoir of the area. The reservoir includes three discrete aquifers, not all found in the same locality, which transect geologic boundaries. The shallow unconfined aquifer consists of those permeable Pleistocene and Cretaceous deposits that lie within the upper part of the zone of saturation, which extends from slightly below sea level to more than 110 feet above sea level. It is an abundant source of water in much of the area, particularly in the southern part, where the aquifer consists of coarse sand and gravel in a glacial-outwash plain. The intermediate or principal aquifer consists largely of that part of the Magothy(?) formation that occurs from about 50 feet below sea level downward to the top of the clay member of the Raritan formation. Locally, however, the aquifer includes Pleistocene deposits which blanket the Magothy(?) formation or lie in channels cut into it. Although the principal aquifer has limited extent to the north, it is the chief source of water in most of the area, except the peninsulas. The lower or deep confined aquifer is found beneath the entire project area, and consists of the Lloyd sand member of the Raritan formation and the hydraulically contiguous Jameco gravel. The lower limit of the aquifer is the bedrock surface; its upper limit is defined by the overlying clay member of the Raritan formation and the Gardiners clay, the latter abutting against the clay member on the north or, in some valleys and embankments, lying directly upon the clay member. Thus, hydraulic continuity exists between the Lloyd sand member of the Raritan formation (Cretaceous) and the Jameco gravel (Pleistocene) in the northern part of Manhasset and Great Necks. The two contiguous clay bodies overlying the aquifer, the clay member of the Raritan formation and the Gardiners clay, form an effective confining bed which probably extends beyond the shore lines of the project area. The deep confined aquifer is particularly important on Manhasset and Great Necks where locally it is the only source of water available for large public-supply or industrial needs. In general, ground-water supplies in sufficient quantity and of excellent quality can be obtained from the three aquifers underlying northwestern Nassau and northeastern Queens Counties, N.Y. Ground-water withdrawals for public supply have increased with population growth and expanded use from an average of about 10 millions of gallons per day in 1940 to 30 mgd in 1957. In addition, about 10 mgd are pumped for various industrial, institutional and private uses. Much of the water pumped by industry is returned to the ground by diffusion wells and recharge basins. However, an increasing amount of water is lost from the ground-water reservoir due to the expanding network of server systems discharging directly to the sea. In the Manhasset Neck and Great Neck areas, ground-water resources are approaching full development in terms of the total available supply, if such development has not been reached already (1959). The chief limiting factor to further expansion lies in the geometry of the aquifers and the reduced thickness of permeable saturated sediments. In the northern part of both peninsulas, the ground-water reservoir is only about 200 to 400 feet thick, and, locally, as much as 75 percent of the strata in the reservoir consists of rather impermeable silt and clay of the Raritan formation or the Gardiners clay. I

  8. Clastic dikes of Heart Mountain fault breccia, northwestern Wyoming, and their significance

    USGS Publications Warehouse

    Pierce, W.G.

    1979-01-01

    Structural features in northwestern Wyoming indicate that the Heart Mountain fault movement was an extremely rapid, cataclysmic event that created a large volume of carbonate fault breccia derived entirely from the lower part of the upper plate. After fault movement had ceased, much of the carbonate fault breccia, here called calcibreccia, lay loose on the resulting surface of tectonic denudation. Before this unconsolidated calcibreccia could be removed by erosion, it was buried beneath a cover of Tertiary volcanic rocks: the Wapiti Formation, composed of volcanic breccia, poorly sorted volcanic breccia mudflows, and lava flows, and clearly shown in many places by inter lensing and intermixing of the calcibreccia with basal volcanic rocks. As the weight of volcanic overburden increased, the unstable water-saturated calcibreccia became mobile and semifluid and was injected upward as dikes into the overlying volcanic rocks and to a lesser extent into rocks of the upper plate. In some places the lowermost part of the volcanic overburden appears to have flowed with the calcibreccia to form dike like bodies of mixed volcanic rock and calcibreccia. One calcibreccia dike even contains carbonized wood, presumably incorporated into unconsolidated calcibreccia on the surface of tectonic denudation and covered by volcanic rocks before moving upward with the dike. Angular xenoliths of Precambrian rocks, enclosed in another calcibreccia dike and in an adjoining dikelike mass of volcanic rock as well, are believed to have been torn from the walls of a vent and incorporated into the basal part of the Wapiti Formation overlying the clastic carbonate rock on the fault surface. Subsequently, some of these xenoliths were incorporated into the calcibreccia during the process of dike intrusion. Throughout the Heart Mountain fault area, the basal part of the upper-plate blocks or masses are brecciated, irrespective of the size of the blocks, more intensely at the base and in places extending upward for several tens of meters. North of Republic Mountain a small 25-m-high upper-plate mass, brecciated to some degree throughout, apparently moved some distance along the Heart Mountain fault as brecciated rock. Calcibreccia dikes intrude upward from the underlying 2 m of fault breccia into the lower part of the mass and also from its top into the overlying volcanic rocks; an earthquake-related mechanism most likely accounts for the observed features of this deformed body. Calcibreccia dikes are more common within the bedding-plane phase of the Heart Mountain fault but also occur in its transgressive and former land-surface phases. Evidence that the Wapiti Formation almost immediately buried loose, unconsolidated fault breccia that was the source of the dike rock strongly suggests a rapid volcanic deposition over the area in which clastic dikes occur, which is at least 75 km long. Clastic dikes were injected into both the upper-plate and the volcanic rocks at about the same time, after movement on the Heart Mouuntain fault had ceased, and therefore do not indicate a fluid-flotation mechanism for the Heart Mountain fault. The difference between contacts of the clastic dikes with both indurated and unconsolidated country rock is useful in field mapping at localities where it is difficult to distinguish between volcanic rocks of the Cathedral Cliffs and Lamar River Formations, and the Wapiti Formation. Thus, calcibreccia dikes in the Cathedral Cliffs and Lamar River Formations show a sharp contact because the country rock solidified prior to fault movement, whereas calcibreccia dikes in the Wapiti Formation in many instances show a transitional or semifluid contact because the country rock was still unconsolidated or semifluid at the time of dike injection.

  9. Trace elements in moose (Alices alces) found dead in Northwestern Minnesota, USA

    USGS Publications Warehouse

    Custer, T.W.; Cox, E.; Gray, B.

    2004-01-01

    The moose (Alces alces) population in bog and forest areas of Northwestern Minnesota has declined for more than 25 years, and more recently the decline is throughout Northwestern Minnesota. Both deficiencies and elevations in trace elements have been linked to the health of moose worldwide. The objective of this study was to evaluate whether trace element toxicity or deficiency may have contributed to the decline of moose in Northwestern Minnesota. Livers of 81 moose found dead in Northwestern Minnesota in 1998 and 1999 were analyzed for trace elements. With the exception of selenium (Se) and copper (Cu), trace elements were not at toxic or deficient levels based on criteria set for cattle. Selenium concentrations in moose livers based on criteria set for cattle were deficient in 3.7% of livers and at a chronic toxicity level in 16% of livers. Copper concentrations based on criteria set for cattle were deficient in 39.5% of livers, marginally deficient in 29.5% of livers and adequate in 31% of livers. Moose from agricultural areas had higher concentrations, on average, of Cd, Cu, Mo and Se in their livers than moose from bog and forest areas. Older moose had higher concentrations of Cd and Zn, and lower concentrations of Cu than younger moose. Copper deficiency, which has been associated with population declines of moose in Alaska and Sweden, may be a factor contributing to the decline of moose in Northwestern Minnesota. (C) 2004 Elsevier B.V. All rights reserved.

  10. The Library as Leader: Computer Assisted Information Services at Northwestern University. A Report of the NULCAIS Committee on the Present Status, and Proposals for the Future, of Computer Assisted Information Services at Northwestern University Library.

    ERIC Educational Resources Information Center

    Northwestern Univ., Evanston, IL. Univ. Libraries.

    In March 1974, a study was undertaken at Northwestern University to examine the role of the library in providing information services based on computerized data bases. After taking an inventory of existing data bases at Northwestern and in the greater Chicago area, a committee suggested ways to continue and expand the scope of information…

  11. Assessing impacts of unconventional natural gas extraction on microbial communities in headwater stream ecosystems in Northwestern Pennsylvania

    PubMed Central

    Trexler, Ryan; Solomon, Caroline; Brislawn, Colin J.; Wright, Justin R.; Rosenberger, Abigail; McClure, Erin E.; Grube, Alyssa M.; Peterson, Mark P.; Keddache, Mehdi; Mason, Olivia U.; Hazen, Terry C.; Grant, Christopher J.; Lamendella, Regina

    2014-01-01

    Hydraulic fracturing and horizontal drilling have increased dramatically in Pennsylvania Marcellus shale formations, however the potential for major environmental impacts are still incompletely understood. High-throughput sequencing of the 16S rRNA gene was performed to characterize the microbial community structure of water, sediment, bryophyte, and biofilm samples from 26 headwater stream sites in northwestern Pennsylvania with different histories of fracking activity within Marcellus shale formations. Further, we describe the relationship between microbial community structure and environmental parameters measured. Approximately 3.2 million 16S rRNA gene sequences were retrieved from a total of 58 samples. Microbial community analyses showed significant reductions in species richness as well as evenness in sites with Marcellus shale activity. Beta diversity analyses revealed distinct microbial community structure between sites with and without Marcellus shale activity. For example, operational taxonomic units (OTUs) within the Acetobacteracea, Methylocystaceae, Acidobacteriaceae, and Phenylobacterium were greater than three log-fold more abundant in MSA+ sites as compared to MSA? sites. Further, several of these OTUs were strongly negatively correlated with pH and positively correlated with the number of wellpads in a watershed. It should be noted that many of the OTUs enriched in MSA+ sites are putative acidophilic and/or methanotrophic populations. This study revealed apparent shifts in the autochthonous microbial communities and highlighted potential members that could be responding to changing stream conditions as a result of nascent industrial activity in these aquatic ecosystems. PMID:25408683

  12. Assessing impacts of unconventional natural gas extraction on microbial communities in headwater stream ecosystems in Northwestern Pennsylvania.

    PubMed

    Trexler, Ryan; Solomon, Caroline; Brislawn, Colin J; Wright, Justin R; Rosenberger, Abigail; McClure, Erin E; Grube, Alyssa M; Peterson, Mark P; Keddache, Mehdi; Mason, Olivia U; Hazen, Terry C; Grant, Christopher J; Lamendella, Regina

    2014-01-01

    Hydraulic fracturing and horizontal drilling have increased dramatically in Pennsylvania Marcellus shale formations, however the potential for major environmental impacts are still incompletely understood. High-throughput sequencing of the 16S rRNA gene was performed to characterize the microbial community structure of water, sediment, bryophyte, and biofilm samples from 26 headwater stream sites in northwestern Pennsylvania with different histories of fracking activity within Marcellus shale formations. Further, we describe the relationship between microbial community structure and environmental parameters measured. Approximately 3.2 million 16S rRNA gene sequences were retrieved from a total of 58 samples. Microbial community analyses showed significant reductions in species richness as well as evenness in sites with Marcellus shale activity. Beta diversity analyses revealed distinct microbial community structure between sites with and without Marcellus shale activity. For example, operational taxonomic units (OTUs) within the Acetobacteracea, Methylocystaceae, Acidobacteriaceae, and Phenylobacterium were greater than three log-fold more abundant in MSA+ sites as compared to MSA- sites. Further, several of these OTUs were strongly negatively correlated with pH and positively correlated with the number of wellpads in a watershed. It should be noted that many of the OTUs enriched in MSA+ sites are putative acidophilic and/or methanotrophic populations. This study revealed apparent shifts in the autochthonous microbial communities and highlighted potential members that could be responding to changing stream conditions as a result of nascent industrial activity in these aquatic ecosystems. PMID:25408683

  13. Experimental evidence that oral secretions of northwestern ring-necked snakes ( Diadophis punctatus occidentalis) are toxic to their prey

    Microsoft Academic Search

    Ryan P. O’Donnell; Kevin Staniland; Robert T. Mason

    2007-01-01

    Ring-necked snakes (Diadophis punctatus) are suspected of being venomous because their Duvernoy's gland secretions have high levels of phospholipase activity, which is characteristic of many viperid and elapid venoms, and because anecdotal reports of feeding behavior are consistent with the use of a venom. We tested the toxicity of northwestern ring-necked snake oral secretions to a natural prey species, northwestern

  14. Geologic evidence for the prolongation of active normal faults of the Mona Rift into northwestern Puerto Rico

    E-print Network

    Boyer, Edmond

    Puerto Rico J.-C. Hippolyte1 , P. Mann2 and N. Grindlay3 1 UMR CNRS 5025 Laboratoire de Géodynamique des (eastern Hispaniola) from a subducting area (northwestern Puerto Rico). Near the city of Aguadilla in northwestern Puerto Rico, paleostress reconstruction through fault slip analysis demonstrates that the Mona

  15. Student Records: Accessing User Reports CAESAR/SES Page 1 2012 Northwestern University Updated 10/21/2012

    E-print Network

    Staum, Jeremy

    Student Records: Accessing User Reports CAESAR/SES Page 1 © 2012 Northwestern University Updated 10/21/2012 SES/CAESAR v. 9.0 Student Records A Step-by-Step Guide Records: Accessing User Reports CAESAR/SES Page 2 © 2012 Northwestern University Updated 10/21/2012 1. Map

  16. 2012 Tuition &HousingDeposits Page1 NorthwesternUniversity CAESAR/SES Updated:03/13/2013

    E-print Network

    Shahriar, Selim

    ©2012 Tuition &HousingDeposits Page1 NorthwesternUniversity CAESAR/SES Updated:03/13/2013 SES/CAESAR/or housing deposits on CAESAR. For more information on these and other CAESAR functions, see the online help at http://www.northwestern.edu/caesar/help/. If you need further assistance, contact the IT Information

  17. 2012 Viewor PayTuition Bill Page1 NorthwesternUniversity CAESAR/SES Updated:07/23/2012

    E-print Network

    Shahriar, Selim

    ©2012 Viewor PayTuition Bill Page1 NorthwesternUniversity CAESAR/SES Updated:07/23/2012 SES/CAESAR tuition bill on CAESAR. For more information about using these and other CAESAR functions, please see the online help available from http://www.northwestern.edu/caesar/help/. If you need further assistance

  18. Range-wide phylogeographic analysis of the spotted frog complex ( Rana luteiventris and Rana pretiosa) in northwestern North America

    Microsoft Academic Search

    W. Chris Funk; Christopher A. Pearl; Hope M. Draheim; Michael J. Adams; Thomas D. Mullins; Susan M. Haig

    2008-01-01

    The dynamic geological and climatic history of northwestern North America has made it a focal region for phylogeography. We conducted a range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) across its range in northwestern North America to understand its evolutionary history and the distribution of clades to inform conservation of R. pretiosa and Great Basin

  19. As part of the mission of Northwestern University Feinberg School of Medicine to mentor and educate students to become inquiry-driven physicians, educators, and

    E-print Network

    Chisholm, Rex L.

    As part of the mission of Northwestern University Feinberg School of Medicine to mentor and educate Feinberg curriculum, which will begin rollout in the 2012/13 academic year. Course Descriptions Northwestern University Feinberg School of Medicine Area of Scholarly Concentration Program Northwestern

  20. Acritarchs and microfossils from the Mesoproterozoic Bangemall Group, northwestern Australia.

    PubMed

    Buick, R; Knoll, A H

    1999-09-01

    Three microfossil assemblages occur in the Mesoproterozoic Bangemall Group (1625-1000 Ma) of northwestern Australia, each occupying a different environmental and taphonomic setting. In peritidal environments, benthic prokaryotic filaments and spheroids of matting habit and small size were permineralized by early diagenetic silicification of stromatolitic carbonates. In shallow subtidal environments, benthic filaments of large size and nonmatting habit and planktonic sphaeromorph acritarchs with thin walls and moderate dimensions were compressed in mildly kerogenous shale. In deeper subtidal environments, planktonic megasphaeromorph acritarchs with thick walls were initially entombed in concretionary nodules in highly kerogenous shale and then permineralized by silica during later diagenesis. Taxonomic diversity and numerical abundance evidently decrease offshore. The three assemblages have typical Mesoproterozoic aspects: peritidal benthic habitats were dominated by Siphonophycus-Sphaerophycus-Eosynechococcus-Myxococcoides-Palaeopleurocapsa, shallow subtidal settings were occupied by Siphonophycus-Leiosphaeridia-Pterosphermopsimorpha-Satka, and offshore plankton consisted solely of very large chuarid acritarchs. Because of its taphonomic restriction to mid-intertidal stromatolites, the peritidal assemblage can be equated in microenvironment with a similar assemblage in the Neoproterozoic Draken Conglomerate, suggesting that ecological stasis at the community level can last for intervals up to 900 million years. In the deeper subtidal assemblage, the common chuarid has an unusual mode of preservation, in three dimensions in early diagenetic concretions, revealing that it possesses a thick multilamellate wall. Because of this distinctive ultrastructure, the new genus Crassicorium is erected for these fossils, which are among the oldest indubitable eukaryotes. Very large (34-55 micrometers in diameter) filaments from shallow subtidal habitats are assigned to the emended species Siphonophycus punctatum. PMID:11543499

  1. Mesozoic stratigraphy of northwestern Australian and northern Himalayan margins

    SciTech Connect

    Ogg, J.; Kopaskamerkel, D.C.

    1989-03-01

    The Mesozoic stratigraphies of the Himalayan margin, the Argo abyssal plain, and the Exmouth Plateau exhibit marked contrasts in their sedimentation histories. The sedimentary sequence on the northeastern Exmouth Plateau off Australia includes a Carnian to Rhaetian sequence of fluviodeltaic and marine clastics and carbonates, capped by a shallowing-upward sequence of platform carbonates overlain, with a major unconformity, by marine Aptian sediments deposited during rapid subsidence of the plateau. Argo abyssal plain basement is overlain by red-brown, bioturbated, inoceramid-rich quartzose claystones, bentonites, and quartz siltstones, dated by radiolarians and benthic foraminifera as lowest Cretaceous. This is overlain by red and green claystones and nannofossil chalks. The basal age indicates that sea-floor spreading began in the earliest Cretaceous, not Oxfordian as had been thought. In the Thakkola region of Nepal, uppermost Triassic through Lower Jurassic shelf and carbonate platform facies are capped by a ferruginous oolite deposit of latest Bathonian to earliest Callovian age. Sedimentation resumed in the middle Oxfordian with deposition of Berriasian( ) deep-water black organic-rich mud. Following a valanginian regression and progradation of terrigenous clastics, Aptian black shales were deposited. In geological studies of the northwestern Australian margin, the ubiquitous hiatus within the Callovian-Oxfordian has been termed the breakup unconformity. Existence of a similar-aged hiatus in the Himalayas on a margin which formed during the late Paleozoic, absence of any Jurassic on the Exmouth Plateau, and the apparent initiation of spreading in the Argo basin during the earliest Cretaceous suggest that this widespread unconformity is not associated with a continental breakup in these regions.

  2. Comparative phylogeography in marginal seas of the northwestern Pacific.

    PubMed

    Ni, Gang; Li, Qi; Kong, Lingfeng; Yu, Hong

    2014-02-01

    The maturation of marine phylogeography depends on integration of comparative information across different regions globally. The northwestern Pacific, characterized by unique tectonic setting, however, is still underrepresented. This study seeks to highlight its phylogeographical history based on the available population data, focusing on three seas: the East China Sea (ECS), the South China Sea (SCS) and the Sea of Japan (SOJ). We first conducted a literature survey to evaluate current research efforts and then reanalysed the population structure, historical demography and genealogy for two selections of studies (namely ‘the ECS category’ and ‘the multiple-sea category’) to elucidate the evolutionary processes within and across the seas, respectively. For the ECS category, the meta-analyses revealed most studies displayed a shallow phylogeny, indicating a single origin from the sea. Significant population structure was commonplace, particularly in molluck and crustacean studies, with proportions of 89% and 80%, respectively. Nearly all studies selected showed signals of population expansion: the times estimated were closely linked to a period of ~120-140 Kya rather than the last glacial maximum. For the latter category, divergent intraspecific lineages appeared among seas and overlapped in the adjacent regions, a pattern implying each sea had served as an independent refugium during glaciations. The genetic splits, however, were estimated to arise from separate events dating from late Miocene to middle Pleistocene. As phylogeography is still in its infancy in the region, more effort is needed to test and complement the general rules abstracted here. Finally, challenges and prospects were discussed to accelerate further research. PMID:24600706

  3. Determinants of fish assemblage structure in Northwestern Great Plains streams

    USGS Publications Warehouse

    Mullen, J.A.; Bramblett, R.G.; Guy, C.S.; Zale, A.V.; Roberts, D.W.

    2011-01-01

    Prairie streams are known for their harsh and stochastic physical conditions, and the fish assemblages therein have been shown to be temporally variable. We assessed the spatial and temporal variation in fish assemblage structure in five intermittent, adventitious northwestern Great Plains streams representing a gradient of watershed areas. Fish assemblages and abiotic conditions varied more spatially than temporally. The most important variables explaining fish assemblage structure were longitudinal position and the proportion of fine substrates. The proportion of fine substrates increased proceeding upstream, approaching 100% in all five streams, and species richness declined upstream with increasing fine substrates. High levels of fine substrate in the upper reaches appeared to limit the distribution of obligate lithophilic fish species to reaches further downstream. Species richness and substrates were similar among all five streams at the lowermost and uppermost sites. However, in the middle reaches, species richness increased, the amount of fine substrate decreased, and connectivity increased as watershed area increased. Season and some dimensions of habitat (including thalweg depth, absolute distance to the main-stem river, and watershed size) were not essential in explaining the variation in fish assemblages. Fish species richness varied more temporally than overall fish assemblage structure did because common species were consistently abundant across seasons, whereas rare species were sometimes absent or perhaps not detected by sampling. The similarity in our results among five streams varying in watershed size and those from other studies supports the generalization that spatial variation exceeds temporal variation in the fish assemblages of prairie and warmwater streams. Furthermore, given longitudinal position, substrate, and stream size, general predictions regarding fish assemblage structure and function in prairie streams are possible. ?? American Fisheries Society 2011.

  4. Benthic-Pelagic coupling in the Black Sea northwestern shelf

    NASA Astrophysics Data System (ADS)

    Capet, Arthur; Akoumianaki, Ionna; Meysman, Filip; Soetaert, Karline; Grégoire, Marilaure

    2014-05-01

    A new approach for modeling the benthic compartment in 3D ocean models is applied to analyze the benthic-pelagic coupling in the Black Sea northwestern shelf (BS-NWS) and to review the contribution of sedimentary diagenesis to the BS-NWS biogeochemical cycles (nitrogen, oxygen and carbon). This approach combines an explicit representation of sediment organic matter deposition and resuspension, controlled by the bottom shear stress, and a parameterization of mineralization pathways control by bottom environmental properties. The model reproduces the magnitude and inter-regional and seasonal variability depicted by in situ benthic fluxes estimates obtained by benthic chambers and sediment cores incubations. The model illustrates how this observed variability results from both variable sedimentation rate and variable diagenetic pathways in the sediment layer. Three distinct areas are identified based on the analysis of the simulated seasonal cycle of bottom environmental conditions, benthic-pelagic fluxes and diagenetic processes. These areas extend along a gradient from the land-ocean interface to the open sea boundary and are each characterized by a particular diagenetic pathway, in a way similar as they succeed vertically in a sediment profile. (1) In the hypoxic zone, high remineralization rates lead to a seasonal peak in anoxic diagenesis and under certain conditions to hydrogen sulphide effluxes from the sediment, (2) in the denitrification zone, benthic denitrification rates are maximal and (3) in the oxic zone, where organic matter accumulation are low, oxic diagenesis prevails and seasonality is less marked. This study underlines that representing resuspension and deposition processes in coupled benthic-pelagic models is essential to realistically describe the horizontal distribution of benthic-pelagic fluxes and the export from the shelf region to the deep sea.

  5. Reclamation studies on oil shale lands in northwestern Colorado

    SciTech Connect

    Cook, C.W.; Redente, E.F.

    1980-02-01

    The overall objective of this project is to study the effects of various reclamation practices on above- and belowground ecosystem development associated with disturbed oil shale lands in northwestern Colorado. Plant growth media that are being used in field test plots include retorted shale, soil over retorted shale, subsoil materials, and surface disturbed topsoils. Some of the more significant results are: (1) a soil cover of at least 61 cm in conjunction with a capiallary barrier provided the best combination of treatments for the establishment of vegetation and a functional microbial community, (2) aboveground production values for native and introduced species mixtures are comparable after three growing seasons, (3) cover values for native species mixtures are generally greater than for introduced species, (4) native seed mixtures, in general, allow greater invasion to occur, (5) sewage sludge at relatively low rates appears to provide the most beneficial overall effect on plant growth, (6) cultural practices, such as irrigated and mulching have significant effects on both above- and belowground ecosystem development, (7) topsoil storage after 1.5 years does not appear to significantly affect general microbial activities but does reduce the mycorrhizal infection potential of the soil at shallow depths, (8) populations of mycorrhizal fungi are decreased on severely disturbed soils if a cover of vegetation is not established, (9) significant biological differences among ecotypes of important shrub species have been identified, (10) a vegetation model is outlined which upon completion will enable the reclamation specialist to predict the plant species combinations best adapted to specific reclamation sites, and (11) synthetic strains of two important grass species are close to development which will provide superior plant materials for reclamation in the West.

  6. Distribution of the Late-Quaternary deformation in Northwestern Himalaya

    NASA Astrophysics Data System (ADS)

    Vassallo, R.; Mugnier, J.-L.; Vignon, V.; Malik, M. A.; Jayangondaperumal, R.; Srivastava, P.; Jouanne, F.; Carcaillet, J.

    2015-02-01

    Three main Cenozoic thrusts at the front of Northwestern Himalaya have accommodated most of the India-Eurasia convergence across the belt over the last million years and produced the present relief. Their recent tectonic activity is poorly known because of the long period of inaccessibility of the Jammu and Kashmir state, and because the latest and only large earthquake recorded in the region occurred in 1555 AD. We show where the deformation is localized during the Late-Quaternary, and determine shortening rates across the structures by analyzing the geometry and chronology of geomorphic markers. The Main Boundary Thrust in this region ceased moving at least ?30 ka ago. On the contrary, the more external Medlicott-Wadia Thrust and Main Frontal Thrust, both merging at depth on the sub-flat detachment of the Main Himalayan Thrust, exhibit hectometric-scale deformations accumulated during the last thousands of years. The total shortening rate absorbed by these faults over the last 14-24 ka is between 13.2 and 27.2 mm/yr (11.2 ± 3.8 and 9.0 ± 3.2 mm /yr, respectively). Part of this deformation may be associated to the geometry of the Chenab reentrant, which could generate an extra oblique component. However, the lower bound of our shortening rates is consistent with previously determined geodetic rates. Active deformation on these structures follows an in-sequence/out-of-sequence pattern, with breaking of both ramps being possible for earthquakes triggered on the main detachment.

  7. Geoid modeling over Alaska, USA and northwestern Canada

    NASA Astrophysics Data System (ADS)

    Li, X.; Huang, J.; Roman, D. R.; Wang, Y.; Smith, D. A.; Véronneau, M.

    2013-05-01

    Geoid modeling over Alaska, USA and northwestern Canada is not only a transboudary issue, but also technically challenging. The region features (1) a complex terrain that includes the two highest mountains in North America, Mount McKinely (20,320ft) in Alaska and Mount Logan (19,541ft) in the Yukon Territory and six major mountain chains; (2) a dynamic geology characterized with strong tectonic movement, significant post glacial rebound and ice melting; (3) inhomogeneous and sparse surface gravity data collected over a span of a century; and (4) a lack of high-quality independent validation data limited to a few leveling lines that are subject to large systematic errors. The previous joint studies (EGU 2012 and AGU 2012) between the US National Geodetic Survey and Geodetic Survey Division of Natural Resources Canada showed that GRACE and GOCE have improved the knowledge of the Earth's gravity field, correspondingly the geoid model over this region. However, several key aspects are still open to further improvement including data interpolation, downward continuation, optimal satellite and terrestrial data combination, and geoid validation. This continuous study deals with these aspects in order to improve the determination of, and better understand the accuracy of the resulting geoid model in this region. First, the low to middle degree components of satellite-only global gravity models are used to reflect the long wavelength geology signals of the geoid. Second the tailored spherical harmonic approach is applied to improve the global geopotential model such as EGM2008 in the middle to high frequency band. Third, a rigorous downward continuation in the mountainous regions is employed to account for the topographic effect. Finally the existing GPS-Leveling data are analyzed to detect and reduce the crustal motion effect and systematic errors. They are used to infer the accuracy of the geoid model. The validation also includes comparisons to EGM2008 and CGG2010.

  8. A soil catena on schist in northwestern California

    USGS Publications Warehouse

    Marron, D.C.; Popenoe, J.H.

    1986-01-01

    Soil characteristics in a small steepland watershed underlain by schist in a rainy, tectonically active area in northwestern California show close associations with drainage-basin position and slope characteristics. Five soil-topography units based on these associations are defined in the study watershed. Spatial relationships of soil series, and patterns of soil development as indicated by B-horizon clay content and redness, reflect interactions between pedogenesis and erosion. General soil-topography patterns include: (1) decreases in soil-development moving from low-order to higher-order stream vallyes; and (2) more developed soils on north-facing as opposed to south-facing slopes. Decreases in soil-profile development moving from slopes near low-order streams to slopes near higher-order streams approximately correlate with increases in gradient, vertical relief, and drainage density, and reflect a more vigorous stripping of regolith by erosion on the slopes near the higher-order streams. The larger percentage of area covered by the more developed soils on north-facing as opposed to south-facing slopes appears to reflect a contrast in the way dominant erosional processes interact with pedogenic processes. Roadcuts on middle and upper slopes show soil discontinuities indicative of disturbance by block slides or slumps or both. Roadcuts on lower slopes show disrupted soils in small bedrock hollows that could have been created by rapid, shallow landslides or by the pulled-up root wads of toppled trees. Soil-profile characteristics and soil-topography patterns in the study area demonstrate that both erosional and pedogenic processes need to be considered when interpreting characteristics of hillslope soils. ?? 1986.

  9. Seismicity and tectonics in Jujuy Province, northwestern Argentina

    NASA Astrophysics Data System (ADS)

    Cahill, Thomas; Isacks, Bryan L.; Whitman, Dean; Chatelain, Jean-Luc; Perez, Alejandro; Chiu, Jer Ming

    1992-10-01

    The Portable Array for Numerical Digital Analysis (PANDA) network, a digitally recorded seismic array, operated for nine months in Jujuy province of northwestern Argentina. The network was deployed along the eastern edge of the Altiplano-Puna plateau in a major N-S thrust belt that is transitional in style between the thin-skinned deformation of the Bolivian foreland to the north and basement-involved deformation of the Pampean region to the south. Teleseismic locations of crustal earthquakes in the region indicate that seismicity is associated with compressional structures found near the eastern deformation front. No crustal seismicity was detected beneath the Puna plateau to the west. Peak seismicity levels beneath the foreland occurred between 20 and 25 km depth; a sharp decrease in seismicity was observed below 25 km. An estimate of 42 km for the thickness of the Jujuy foreland crust was inferred from wide-angle Moho reflections observed on the digital seismograms. The highest concentration of crustal seismicity was located beneath Sierra de Zapla, a broad anticline immediately east of San Salvador de Jujuy. Many of the earthquakes in the 20-25 km depth range have a shallow, west dipping nodal plane as does the focal mechanism solution for a moderately large 1973 earthquake. Inversion of focal mechanism data for the orientation of principal stresses shows that maximum compression is oriented at azimuth 74°, closely paralleling both the current Nazca-South America convergence direction and the shortening direction derived from regional Quaternary fault slip data. We interpret the earthquakes as occurring on planes of weakness first produced during Cretaceous rifting and later reactivated by Neogene compressive stresses. Crustal seismicity patterns and fault plane solutions suggest the presence of a midcrustal detachment, along which significant late Cenozoic E-W shortening has occurred.

  10. Rabies surveillance in bats in Northwestern State of São Paulo.

    PubMed

    Casagrande, Daiene Karina Azevedo; Favaro, Ana Beatriz Botto de Barros da Cruz; de Carvalho, Cristiano; Picolo, Mileia Ricci; Hernandez, Janaína Camila Borges; Lot, Monique Serra; Albas, Avelino; Araújo, Danielle Bastos; André Pedro, Wagner; Queiroz, Luzia Helena

    2014-01-01

    Introduction Rabies is an important zoonosis that occurs in mammals, with bats acting as Lyssavirus reservoirs in urban, rural and natural areas. Rabies cases in bats have been recorded primarily in urban areas in Northwestern State of São Paulo since 1998. This study investigated the circulation of rabies virus by seeking to identify the virus in the brain in several species of bats in this region and by measuring rabies-virus neutralizing antibody levels in the hematophagous bat Desmodus rotundus. Methods From 2008 to 2012, 1,490 bat brain samples were sent to the Universidade Estadual Paulista (UNESP) Rabies Laboratory in Araçatuba, and 125 serum samples from vampire bats that were captured in this geographical region were analyzed. Results Rabies virus was detected in the brains of 26 (2%) of 1,314 non-hematophagous bats using the fluorescent antibody test (FAT) and the mouse inoculation test (MIT). None of the 176 hematophagous bat samples were positive for rabies virus when a virus detection test was utilized. Out of 125 vampire bat serum samples, 9 (7%) had levels of rabies virus neutralization antibodies (RVNAs) that were higher than 0.5IU/mL; 65% (81/125) had titers between 0.10IU/mL and 0.5IU/mL; and 28% (35/125) were negative for RVNAs using the simplified fluorescent inhibition microtest (SFIMT) in BHK21 cells. The observed positivity rate (1.7%) was higher than the average positivity rate of 1.3% that was previously found in this region. Conclusions The high percentage of vampire bats with neutralizing antibodies suggests that recent rabies virus exposure has occurred, indicating the necessity of surveillance measures in nearby regions that are at risk to avoid diffusion of the rabies virus and possible rabies occurrences. PMID:25626649

  11. Dense shelf water cascades in two northwestern Mediterranean submarine canyon heads during winters 2007 and 2008

    NASA Astrophysics Data System (ADS)

    Ribo, Marta; Puig, Pere; Palanques, Albert; Lo Iacono, Claudio

    2010-05-01

    Submarine canyons incised in continental margins are considered to be preferential pathways for the exchange of water and particles between the coastal area and the open sea. Hydrodynamics and sediment transport processes in submarine canyons depend upon several forcing conditions in the region such as general circulation, seafloor morphology and atmospheric regime. The off-shelf sediment transport trough submarine canyons, due to storms and river floods, can be significant and recently dense shelf-water cascading (DSWC) has been also identified as an important transport mechanism able to generate high sediment fluxes in submarine canyons. DSWC is seasonal, resulting from the formation of dense water by cooling and/or evaporation over the shelf, and occurs on both high- and low latitude continental margins. The Palamós and the Cap de Creus submarine canyon heads were instrumented during two consecutive winters to study their respective role in the dynamics of the sediment transport on the northwestern Mediterranean Sea. The Cap de Creus submarine canyon has been intensively studied during the past years as it acts as a major transport conduit during storms and DSWC events. On the contrary, little information exists about the sediment transport processes operating within the Palamós submarine canyon during winter conditions. Observational work during this study consisted of a series of field measurements carried out with instrument moorings during winters 2007 and 2008 at the heads of both submarine canyons, at around 300 m depth. These moorings were equipped with a current meter with temperature, conductivity, pressure and turbidity sensors, placed at 5 m above the seafloor. Multibeam bathymetry from both canyon heads was also acquired and used to determine the canyon axis morphology, which was considered to compute down-canyon fluxes. Forcing conditions were obtained from oceanographic buoys and gaps in the wave height and peak period time series were filled with models outputs. Daily river discharges from nearby rivers were also analyzed. Sediment transport events during winters 2007 and 2008 were quite similar, and several DSWC events were identified and compared among them. Down-canyon current velocities of > 60 cm/s were detected in the Cap de Creus Canyon, and velocities of > 40 cm/s in the Palamós Canyon. Increases in current speed were associated with subtle drops in temperature (~ 1 °C) related to DSWC, and peaks of suspended sediment concentration. Values up to 170 mg/l were recorded during both studied winters at the Cap de Creus canyon head coinciding with the first DSWC event concurrent with an eastern storm. During both study periods no relation was found between sediment transport events and nearby river discharges. The amount of sediment transported during DSWC events at the Cap de Creus Canyon was one order of magnitude greater than the one observed at the Palamós Canyon. This corroborates the fact that most of the off-shelf sediment transport in the northwestern Mediterranean during DSWC events occurs at the southwestern end of the Gulf of Lions, through the Cap de Creus submarine canyon.

  12. Pedogenesis and Permafrost Carbon Over the Eboling Ridge in Heihe River Basin, Northwestern China

    NASA Astrophysics Data System (ADS)

    Mu, C.; Zhang, T.; Cao, B.; Wang, Q.; Peng, X.; Cheng, G.

    2013-12-01

    Based on field permafrost sampling and laboratory analysis, we found that the average storages of soil organic carbon (SOC), total nitrogen (TN) and soil inorganic carbon (SIC) in permafrost soils were much more than that in the active layer on the Eboling Mountain in the upper reach of Heihe River basin, northwestern China. The objective of this study is to better understand the main soil physicochemical parameters influencing C and N dynamics in permafrost regions of northwestern China. Specifically, we investigated the effect of pedogenesis, cryogenic structure and SIC on SOC, TN and water-soluble organic carbon (WSOC) in the permafrost regions. The preliminary results show that SIC is a significant factor influencing carbon flux between atmosphere and terrestrial ecosystem and the distribution patterns of SOC and N. There are high correlation between SIC, SOC and N in permafrost. SOC and SIC can interact with each other, their small change may radically alter the carbon balance. SIC as a major factor will be crucial for developing large scale models evaluating C and N dynamics. High contents of C and N combined with a low vertical variability in each horizon on the Eboling Mountain can be explained by longer duration of pedogenesis and the influence of permafrost. In permafrost regions, the vertical distribution of soil C and N is also influenced by soil cryogenic structure. The high content of WSOC in deep permafrost soils can be explained by the formation of the ground ice causes the WSOC enrichment followed moisture migration. The average WSOC content in permafrost soils was larger than that in the active layer, suggesting that the labile carbon in permafrost soils has higher quality. SIC can reflect the microbial activity indirectly, due to the good negative relationship between SIC, soil pH and C/N ratios in permafrost. Soil pH values were the important factor influencing the distribution of SIC in deep permafrost soils. SIC in permafrost soils was controlled by acidification and other processes depending on soil pH. Microbial activity may be lower in soils with more acidic pH than in soils at circumneutral and alkaline pH, due to less soluble dissolved organic matter. The effect of geochemical variation in permafrost soils on microbial activity and SOM decomposition rates needs more research. The degradation of permafrost and ground ice melting with permafrost temperature increase on the Eboling Mountain would have severe impact on soil C and available N, which may alter the ecosystems function in arid and semiarid regions. However, in the long term, the growth of vegetation can enhance due to growing season extending, precipitation increasing and temperature increase, which may cause more atmospheric carbon into plants and soils through the photosynthesis. Therefore, the response of permafrost degradation in arid and semi-arid regions to future climate, ecology and landscapes needs more experimental and modeling studies.

  13. Late quaternary pollen records from the Kobuk and Noatak river drainages, northwestern Alaska

    NASA Astrophysics Data System (ADS)

    Anderson, Patricia M.

    1988-05-01

    Pollen diagrams from Joe and Niliq Lakes date to ca. 28,000 and 14,000 yr B.P., respectively. Mesic shurb tundra grew near Joe Lake ca. 28,000 to 26,000 yr B.P. with local Populus populations prior to ca. 27,000 yr B.P. Shrub communities decreased as climate changed with the onset of Itkillik II glaciation (25,000 to 11,500 yr B.P.), and graminoid-dominated tundra characterized vegetation ca. 18,500 to 13,500 yr B.P. Herb tundra was replaced by shrub Betula tundra near both sites ca. 13,500 yr B.P. with local expansion of Populus ca. 11,000 to 10,000 yr B.P. and Alnus ca. 9000 yr B.P. Mixed Picea glauca/P. mariana woodland was established near Joe Lake ca. 6000 yr B.P. These pollen records when combined with others from northern Alaska and northwestern Canada indicate (1) mesic tundra was more common in northwestern Alaska than in northeastern Alaska or northwestern Canada during the Duvanny Yar glacial interval (25,000 to 14,000 yr B.P.); (2) with deglaciation, shrub Betula expanded rapidly in northwestern Alaska but slowly in areas farther east; (3) an early postglacial thermal maximum occurred in northwestern Alaska but had only limited effect on vegetation; and (4) pollen patterns in northern Alaska and northwestern Canada suggest regional differences in late Quaternary climates.

  14. A deep water turbidity origin for the Altuda Formation (Capitanian, Permian), Northwest Glass Mountains, Texas

    USGS Publications Warehouse

    Haneef, Mohammad; Rohr, D.M.; Wardlaw, B.R.

    2000-01-01

    The Altuda Formation (Capitanian) in the northwestern Glass Mountains is comprised of thin, even bedded limestones, dolostones, mixed clastic-carbonates, and silt/sandstones interbedded with basin-ward dipping wedge-shaped clinoforms of the Captian Limestone. The formation is characterized by graded bedding, planar laminations, flame structures, contorted/convolute bedding, horizontal branching burrows, and shelf-derived normal marine fauna. A detailed study of the Altuda Formation north of Old Blue Mountain, Glass Mountains, reveals that the formation in this area was deposited by turbidity currents in slope to basinal settings.

  15. Impact of improved technology on potential reserves of tight gas in East Texas and Northwestern Louisiana. Final topical report, October 1, 1989-September 30, 1990

    SciTech Connect

    Haas, M.R.

    1990-12-01

    The East Texas/Northwestern Louisiana area has been one of the most active tight gas plays over the past decade. Advances in formation evaluation and stimulation technologies offer the prospect of increased reserves at reduced costs from remaining tight gas resource. The purpose of the study was to estimate the remaining potential production from the low permeability portions of the Cotton Valley and Travis Peak Formations, the largest tight gas formations in the area. For a 14,000 square mile study area that straddles the Texas/Louisiana border and the Sabine Uplift, a remaining estimated 2.8 Tcf is technically recoverable from the Cotton Valley Sand and 1.2 Tcf from the Upper Travis Peak. These estimates were based on a regional geologic appraisal of currently producing reservoirs. Typical wells were analyzed and used as the basis to extrapolate expected future production from the remaining undeveloped areas of these reservoirs. The analysis incorporated potential improvements in formation evaluation and stimulation technologies and current costing and industry financial parameters to estimate potential reserves at alternative wellhead prices. Reservoir data and analysis results can be used to identify which geological and technical parameters are most important to efficient recovery of East Texas tight sands. Three case studies are also presented of improved technologies in the study area over the past decade. The studies indicate that technology improvements have been made in the design and implementation of new stimulation technologies, as well as in formation evaluation and reservoir management.

  16. Minturn Formation of Eagle basin: an exploration frontier

    SciTech Connect

    Dodge, C.J.N.; Bartleson, B.

    1986-08-01

    The Eagle basin, a predominantly Desmoinesian evaporite basin in northwestern Colorado, contains many targets for oil and gas reserves. Facies patterns of the Minturn Formation of the Eagle basin are strikingly similar to those of the prolific Paradox Formation of the Paradox basin. Both basins and formations also contain lens-shaped carbonate algal-bioherms. These algal-bioherms are particularly attractive reservoirs where they flank halite-basin margins, the areas of optimum dolomitization. The Minturn formation has been subdivided into individual rock packages using subsurface control. Facies maps constructed for individual units indicate the Eagle basin is a series of smaller basins, each having served as a center for halite deposition. Data support a deep-water model for the deposition of halite; however, a sabkhalike environment existed between the halite basins and the normal marine facies. Halite depocenters appear to have been structurally controlled. The Minturn Formation is very thick and may contain multiple prospective zones at any one location. Within the past year, two and possibly three Minturn discoveries have been made in northwestern Colorado.

  17. Deformation of Northwestern South America from GPS Geodesy

    NASA Astrophysics Data System (ADS)

    Mora-Paez, H.; La Femina, P. C.; Mothes, P. A.; Ruiz, A. G.; Fernandes, R. M.

    2013-12-01

    The North Andes block (NAB) is a hypothesized tectonic block that migrates (escapes) north-northeast relative to a stable South American reference frame. The motion of this block is thought-to-be derived by the collision of the Carnegie Ridge in southern Ecuador and/or by oblique convergence and high degrees of interplate coupling north of the ridge (i.e., strain partitioning). At the latitude of Ecuador, the NAB is defined by transpressional deformation accommodating east-northeastward motion along its boundary with South America. In southern to central Colombia, the NAB is dissected by several mapped and prominent regional shear zones. At these latitudes the NAB may be bound to the west by the Choco block and the transpressional Atrato-Uraba fault system and to the east by the Guayaquil-Algeciras fault system. And in northern Colombia the Caribbean - South America plate boundary is defined by the NAB and proposed Maracaibo and Guajira blocks. We investigate the deformation of northwestern South America, including the kinematics of NAB utilizing a new velocity field based on continuous GPS and existing episodic GPS data in Ecuador, Colombia, Venezuela and Panama. We reference these new velocities to a newly estimated Euler vector for the South America plate based on inversion of cGPS data from stations east of the Andes. The new velocity field and published earthquake slip vectors are inverted to solve for the Euler vectors of the NAB, Choco, Panama, Maracaibo and Guajira blocks and interseismic elastic strain accumulation (interseismic coupling) on block-bounding faults using a block modeling approach. We test a suite of block models to investigate the tectonic nature of the NAB along strike and the style of faulting in the upper plate accommodating block motion. Through the estimation of elastic strain accumulation on all block-bounding faults, we improve the understanding of interseismic coupling along a convergent margin capable of producing M>8 earthquakes and faults in the upper plate capable of generating M>6 earthquakes.

  18. Molecular identification of Theileria parasites of northwestern Chinese Cervidae

    PubMed Central

    2014-01-01

    Background Theileria and Babesia protozoan parasites are transmitted mainly by tick vectors. These parasites cause heavy economic losses to the live-stock industry, as well as affecting the health of wild animals in parasite-endemic areas. Identification of infectious agents in wild animals is not only crucial for species preservation, but also provides valuable information on parasite epidemiology. Here, we conducted a molecular surveillance study in Northwestern China to assess the prevalence of blood pathogens in cervids. Methods PCR analysis and microscopic evaluation of blood smears to detect Theileria- and Babesia-related diseases in Cervidae were conducted, in which 22 blood samples from red deer (n?=?22) in Qilian Mountain and 20 from sika deer (n?=?20) in Long Mountain were collected and tested for the presence of Theileria and Babesia. The 18S rRNA gene was amplified, and selected polymerase chain reaction (PCR)-positive samples were sequenced for species identification. Results PCR revealed that 9.1% of the Qilian Mountain samples and 20% of the Long Mountain samples were positive for Theileria uilenbergi; 90.09% of the Qilian Mountain samples (n?=?22) were positive for T. capreoli, but all of the Long Mountain samples (n?=?20) were negative for T. capreoli; no other Theileria or Babesia species were found. PCR showed that T. uilenbergi and T. capreoli were present in red deer in Qilian Mountain, while only T. uilenbergi was found in sika Deer in Long Mountain. The 18S rRNA gene sequences were aligned against the corresponding GenBank sequences of known isolates of Theileria and Babesia and subjected to phylogenetic analysis. The phylogenetic tree showed that the newly isolated Theileria spp. could be classified as belonging to two clades: one group belonged to the same clade as T. uilenbergi, the other to a clade containing T. capreoli. Conclusions Our results provide important data to increase understanding of the epidemiology of Cervidae theileriosis, and will assist with the implementation of measures to control theileriosis transmission to Cervidae and small ruminants in central China. PMID:24885179

  19. Malaria transmission in two localities in north-western Argentina

    PubMed Central

    Dantur Juri, María J; Zaidenberg, Mario; Claps, Guillermo L; Santana, Mirta; Almirón, Walter R

    2009-01-01

    Background Malaria is one of the most important tropical diseases that affects people globally. The influence of environmental conditions in the patterns of temporal distribution of malaria vectors and the disease has been studied in different countries. In the present study, ecological aspects of the malaria vector Anopheles (Anopheles) pseudopunctipennis and their relationship with climatic variables, as well as the seasonality of malaria cases, were studied in two localities, El Oculto and Aguas Blancas, in north-western Argentina. Methods The fluctuation of An. pseudopunctipennis and the malaria cases distribution was analysed with Random Effect Poisson Regression. This analysis takes into account the effect of each climatic variable on the abundance of both vector and malaria cases, giving as results predicted values named Incidence Rate Radio. Results The number of specimens collected in El Oculto and Aguas Blancas was 4224 (88.07%) and 572 (11.93%), respectively. In El Oculto no marked seasonality was found, different from Aguas Blancas, where high abundance was detected at the end of spring and the beginning of summer. The maximum mean temperature affected the An. pseudopunctipennis fluctuation in El Oculto and Aguas Blancas. When considering the relationship between the number of malaria cases and the climatic variables in El Oculto, maximum mean temperature and accumulated rainfall were significant, in contrast with Aguas Blancas, where mean temperature and humidity showed a closer relationship to the fluctuation in the disease. Conclusion The temporal distribution patterns of An. pseudopunctipennis vary in both localities, but spring appears as the season with better conditions for mosquito development. Maximum mean temperature was the most important variable in both localities. Malaria cases were influenced by the maximum mean temperature in El Oculto, while the mean temperature and humidity were significant in Aguas Blancas. In Aguas Blancas peaks of mosquito abundance and three months later, peaks of malaria cases were observed. The study reported here will help to increase knowledge about not only vectors and malaria seasonality but also their relationships with the climatic variables that influence their appearances and abundances. PMID:19152707

  20. Origin and pathways of Winter Intermediate Water in the Northwestern Mediterranean Sea using observations and numerical simulation

    NASA Astrophysics Data System (ADS)

    Juza, Mélanie; Renault, Lionel; Ruiz, Simon; Tintoré, Joaquin

    2013-12-01

    The study of water masses worldwide (their formation, spreading, mixing, and impact on general circulation) is essential for a better understanding of the ocean circulation and variability. In this paper, the formation and main pathways of Winter Intermediate Water (WIW) in the Northwestern Mediterranean Sea (NWMED) are investigated during the winter-spring 2011 using observations and numerical simulation. The main results show that the WIW, formed along the continental shelves of the Gulf of Lion and Balearic Sea, circulates southward following five preferential pathways depending on the WIW formation site location and the oceanic conditions. WIW joins the northeastern part of the Balearic Sea, or flows along the continental shelves until joining the Balearic Current (maximum of 0.33 Sv in early-April) or further south until the Ibiza Channel entrance. Two additional trajectories, contributing to water mass exchanges with the southern part of the Western Mediterranean Sea, bring the WIW through the Ibiza and Mallorca Channels (maxima of 0.26 Sv in late-March and 0.1 Sv in early-April, respectively). The circulation of WIW over the NWMED at 50-200 m depth, its mixing and spreading over the Western Mediterranean Sea (reaching the south of the Balearic Islands, the Algero-Provencal basin, the Ligurian and the Alboran Seas) suggest that the WIW may have an impact on the ocean circulation by eddy blocking effect, exchange of water masses between north and south subbasins of Western Mediterranean Sea through the Ibiza Channel or modification of the ocean stratification.

  1. Impacts of logging and wildfire on an upland black spruce community in northwestern Ontario

    Microsoft Academic Search

    M. H. Johnston; J. A. Elliott

    1996-01-01

    Plant species composition and community structure were compared among four sites in an upland black spruce community in northwestern Ontario. One site had remained undisturbed since the 1930s and three had been disturbed by either logging, fire, or both logging and fire. Canonical correspondence ordination analyses indicated that herbaceous species composition and abundance differed among the disturbance types while differences

  2. Impact of climate change on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle

    E-print Network

    and associated carbon cycle M. Herrmann, C. Estournel, F. Diaz, F. Adloff ; LEGOS, LA, MIO, CNRM The northwestern and associated carbon cycle to the long-term evolution of oceanic and atmospheric circulations. For that we planktonic ecosystem and associated carbon cycle at a first order. However, differences mainly induced

  3. Pricing of Digital Goods vs. Physical Goods Jinxiang Pei (peipauj@u.northwestern.edu)

    E-print Network

    Karaesmen, Fikri

    Pricing of Digital Goods vs. Physical Goods Jinxiang Pei (peipauj@u.northwestern.edu) Diego Klabjan, Turkey May 5, 2013 Abstract E-commerce is growing rapidly and sales of digital goods represent a substantial portion of all online sales. Several goods such as music and books are now available in a physical

  4. A Geographic Information System to Identify Areas for Alternative Crops in Northwestern Wyoming

    Microsoft Academic Search

    J. A. Young; B. M. Christensen; M. S. Schaad; M. E. Herdendorf; G. F. Vance; L. C. Munn

    1999-01-01

    Agriculture is the third largest industry in Wyoming after mining and tourism (R. Micheli, Wyoming Department of Agriculture Director, pers. commun. ). The Bighorn Basin, located in northwestern Wyoming, is one of the largest agricultural production areas of the state. This area accounts for 27% of the value of crops produced in Wyoming (Wyoming Agricultural Statistics Service 1998). The Bighorn

  5. Geochemical, UPb zircon, and Nd isotope investigations of the Neoproterozoic Ghawjah Metavolcanic rocks, Northwestern Saudi Arabia

    E-print Network

    Stern, Robert J.

    rocks, Northwestern Saudi Arabia Kamal A. Ali a, , Robert J. Stern a , William I. Manton a , Jun of Natural History, Laboratory for Isotope Geology, Box 50007, SE-104 05 Stockholm, Sweden d BP America Exploration & Production Company, Houston TX, USA e Geological Consultant, 1242 Tenth Street, NW Washington DC

  6. Making Connections With Impact 1 Welcome to Northwestern University in Qatar

    E-print Network

    Staum, Jeremy

    Making Connections With Impact #12;#12;Contents 1 Welcome to Northwestern University in Qatar 2 Why Qatar 8 Education City 10 A Tradition of Excellence 12 New Building--New Horizons 14 A US Degree, internships and interaction with elite faculty push students to the next level. Through study at the Qatar

  7. The ventilation of near-bottom shelf waters in the North-Western Black Sea

    E-print Network

    Shapiro, Georgy

    The ventilation of near-bottom shelf waters in the North-Western Black Sea Georgy Shapiro, Fred of these areas to be ventilated by horizontal ex- changes during that period is assessed by a long-term time however be ventilated horizontally with deep-sea waters through isopycnal exchanges across the shelf break

  8. REGENERATION RESPONSES OF OAK-DOMINATED STANDS TO THINNING AND CLEARCUTTING IN NORTHWESTERN PENNSYLVANIA

    Microsoft Academic Search

    John A. Stanturf; L. R. Auchmoody; Russell S. Walters

    Regenerating mature oak stands on better sites is difficult on the Allegheny Plateau because of abundant advance regeneration of faster growing competitors. We have observed that oak stands on the Allegheny National iii Forest (ANF) in northwestern Pennsylvania almost always regenerate to cherry-maple rather than to oak-hickory stands. Such conversion greatly concerns land managers and the general public. We surveyed

  9. The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada

    Microsoft Academic Search

    K. P. TIMONEY; ROSS W. WEIN

    1991-01-01

    Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower areal extent of burns, and lower frequency of air photos showing burns, the forest-tundra is distinct from both

  10. Clinical and epidemiologic observations of bovine viral diarrhea virus in the northwestern United States

    Microsoft Academic Search

    James F Evermann; Julia F Ridpath

    2002-01-01

    Retrospective analyses of cases from which bovine viral diarrhea virus (BVDV) was isolated from 1980 to 2000 were conducted. These cases originated from the northwestern US and included both beef and dairy cattle. The results indicated that there was a shift in diseases associated with BVDV infection and in the animal age at onset of disease. Comparative results from the

  11. Late quaternary vegetational change in the Kotzebue sound area, northwestern Alaska

    NASA Astrophysics Data System (ADS)

    Anderson, Patricia M.

    1985-11-01

    Two sediment cores from Kaiyak and Squirrel lakes in northwestern Alaska yielded pollen records that date to ca. 39,000 and 27,000 yr B.P., respectively. Between 39,000 and 14,000 yr B.P., the vegetation around these lakes was dominated by Gramineae and Cyperaceae with some Salix and possibly Betula nana/glandulosa forming a local, shrub component of the vegetation. Betula pollen percentages increased about 14,000 yr B.P., indicating the presence of a birchdominated shrub tundra. Alnus pollen appeared at both sites between 9000 and 8000yr B.P., and Picea pollen (mostly P. mariana) arrived at Squirrel Lake about 5000 yr B.P. The current foresttundra mosaic around Squirrel Lake was established at this time, whereas shrub tundra existed near Kaiyak Lake throughout the Holocene. When compared to other pollen records from north-western North America, these cores (1) represent a meadow component of lowland. Beringian tundra between 39,000 and 14,000 yr B.P., (2) demonstrate an early Holocene arrival of Alnus in northwestern Alaska that predates most other Alnus horizons in northern Alaska or northwestern Canada, and (3) show an east-to-west migration of Picea across northern Alaska from 9000 to 5000 yr B.P.

  12. "A Child has Many Mothers": Views of Child Fostering in Northwestern Cameroon

    ERIC Educational Resources Information Center

    Verhoef, Heidi

    2005-01-01

    This article examines 20 fostering arrangements in a growing urban community in northwestern Cameroon from the perspectives of those involved. Analysis of interviews with caregivers and birth mothers suggests that the nature of adult relationships is central to children's living arrangements. Three caregiver-mother relationship profiles are…

  13. Eligibility Participation in the plan is open to students in the Northwestern

    E-print Network

    Staum, Jeremy

    be charged, and you will be disqualified from the program. Withdrawals If you drop a class or withdraw from all charges not covered by the plan. For example, if your employer is covering 75 percent of your will be liable for collection, court, and legal costs. Audits Northwestern University reserves the right

  14. Characterization of C?isotope variability in the Delhi Supergroup, northwestern India and the Mesoproterozoic ocean

    Microsoft Academic Search

    Anil Maheshwari; A. N. Sial; Ritesh Purhoit; Harsh Bhu

    2009-01-01

    Marine carbonate rocks of the Delhi Supergroup of northwestern India show little deviation in whole?rock ? Ccarb and ? Ocarb values, which generally are around 0 and –10‰ respectively. These narrow ranges and almost constant ? Ccarb values persist despite close sampling through long sections. The data suggest that the global rate of organic carbon burial was probably constant during

  15. Holocene thecideide brachiopods from the north?western Pacific Ocean: Systematics, life habits and ontogeny

    Microsoft Academic Search

    Alan Logan

    2008-01-01

    A new species of the lacazelline brachiopod genus Ospreyella is described from shallow cryptic habitats in Palau, western Caroline Islands and Arnd Atoll, Pohnpei, eastern Caroline Islands, north?western Pacific Ocean. This new taxon, here named Ospreyella palauensis, and representing the third discovery of a species of Ospreyella from the Indo?Pacific region, is compared with the other two recently described extant

  16. Identifying changing climate responses of boreal forest trees in northwestern Canada

    E-print Network

    Feigon, Brooke

    to examine the extent to which apparent divergence of Picea glauca growth in northwestern boreal Canada may of this ongoing research. [1]. Picea glauca growth has an ubiquitous response to summer moisture balance Acknowledgments Tree-ring processing Introduction A network of 32 tree-ring width sites of Picea glauca located

  17. Epibenthic invertebrates and fishes of the continental shelf of the northwestern Gulf of Mexico

    E-print Network

    Al-Jabr, Abdulrahman Mohammad

    1995-01-01

    Data from 34 epibenthic trawls were made on the continental shelf of the northwestern Gulf of Mexico between depths 13 and 400 meters. These took 6,468 individuals belonging to 251 species of demersal fishes and invertebrates, with a mean number...

  18. Soil conservation policy measures to control wind erosion in northwestern Europe

    Microsoft Academic Search

    Michel Riksen; Floor Brouwer; Jan de Graaff

    2003-01-01

    Wind erosion is not as significant or a widespread problem in Europe as in dryer parts of the world, but it can cause major damage in small areas. The hazard is greatest in the lowlands of northwestern Europe with more than 3 million ha at high-potential wind erosion risk. Crop damage and off-site damage have prompted farmers and policymakers to

  19. Aerosol size distributions observed around the tropopause over the Northwestern Pacific Ocean

    Microsoft Academic Search

    Y. Zaizen; K. Okada; Y. Sawa; M. Ikegami; Y. Makino; T. Tanaka; H. Takahashi; K. Shibata

    2003-01-01

    Number-size distributions of aerosol particles in the radius range of 0.008 - 5 mu m were observed at 8 - 11 km altitudes over the Northwestern Pacific Ocean (Nagoya- Petero Pavlovsk - Anchrage; 35 - 61 ° N latitude) during the PACE (Pacific Atmospheric Chemistry Experiment) -7 campaign in February 2000. The vertical profiles indicated that the number concentrations of

  20. Education, Employment and Empowerment: The Case of a Young Woman in Northwestern China

    ERIC Educational Resources Information Center

    Maslak, Mary Ann

    2011-01-01

    As a marginalized region of the world, the rural Gansu Province of northwestern China provides an informative canvas on which to examine and understand the ways in which education contributes to the lives of local Muslim women and supports their goals for work. Specifically, this article highlights the role education plays in the life of one young…

  1. Food habits of the Broad?snouted Caiman (Caiman latirostris: Crocodylia, Alligatoridae) in northwestern Uruguay

    Microsoft Academic Search

    C. Borteiro; F. Gutiérrez; M. Tedros; F. Kolenc

    2009-01-01

    The food habits of the Broad?snouted Caiman (Caiman latirostris) were studied in northwestern Uruguay. The most common prey were insects, the shrimp Pseudopalaemon bouvieri, the snail Pomacea canaliculata, fish and birds. Spiders, crabs, amphibians, snakes, turtles and mammals were consumed less frequently. Arthropods were the most frequent prey for juvenile caiman. Fish and snails were consumed by all size classes.

  2. Estimates of lobster-handling mortality associated with the Northwestern Hawaiian

    E-print Network

    128 Estimates of lobster-handling mortality associated with the Northwestern Hawaiian Islands lobster-trap fishery Gerard T. DiNardo Edward E. DeMartini Honolulu Laboratory, Southwest Fisheries Honolulu, Hawaii 96822 The commercial lobster fishery in the which are close to the sizes at first ma

  3. Turin, the main city of the Piedmont region, north-western Italy TEACH ENGLISH

    E-print Network

    Marques, Oge

    Turin, the main city of the Piedmont region, north-western Italy TEACH ENGLISH IN ITALY (PIEDMONT is offering a work experience as an intern in Italy to teach English in local high schools. The period varies the opportunity to study in Italy ­ courses of Italian or in Italian ­ at the Universita' del Piemonte Orientale

  4. Nitrate distributions and source identification in the Abbotsford-Sumas Aquifer, northwestern Washington State

    USGS Publications Warehouse

    Mitchell, R.J.; Babcock, R.S.; Gelinas, S.; Nanus, L.; Stasney, D.E.

    2003-01-01

    The Abbotsford-Sumas Aquifer is a shallow, predominantly unconfined aquifer that spans regions in southwestern British Columbia, Canada and northwestern Washington, USA. The aquifer is prone to nitrate contamination because of extensive regional agricultural practices. A 22-month ground water nitrate assessment was performed in a 10-km2 study area adjacent to the international boundary in northwestern Washington to examine nitrate concentrations and nitrogen isotope ratios to characterize local source contributions from up-gradient sources in Canada. Nitrate concentrations in excess of 10 mg nitrate as nitrogen per liter (mg N L-1) were observed in ground water from most of the 26 domestic wells sampled in the study area, and in a creek that dissects the study area. The nitrate distribution was characteristic of nonpoint agricultural sources and consistent with the historical documentation of agriculturally related nitrate contamination in many parts of the aquifer. Hydrogeologic information, nitrogen isotope values, and statistical analyses indicated a nitrate concentration stratification in the study area. The highest concentrations (>20 mg N L-1) occurred in shallow regions of the aquifer and were linked to local agricultural practices in northwestern Washington. Nitrate concentrations in excess of 10 mg N L-1 deeper in the aquifer (>10 m) were related to agricultural sources in Canada. The identification of two possible sources of ground water nitrate in northwestern Washington adds to the difficulty in assessing and implementing local nutrient management plans for protecting drinking water in the region.

  5. Transition in the Cause of Fever from Malaria to Dengue, Northwestern Ecuador, 1990–2011

    PubMed Central

    Cifuentes, Sara G.; Trostle, James; Trueba, Gabriel; Milbrath, Meghan; Baldeón, Manuel E.; Coloma, Josefina

    2013-01-01

    In tropical areas, the predominant cause of fever has historically been malaria. However by 2011, among febrile patients in northwestern Ecuador, dengue was identified in 42% and malaria in none. This finding suggests a transition in the cause of fever from malaria to other illnesses, such as dengue. PMID:24047566

  6. Migrant Programs in the Northwestern States -- Idaho, Montana, Nebraska, North Dakota, South Dakota, Oregon, Washington, Wyoming.

    ERIC Educational Resources Information Center

    National Migrant Information Clearinghouse, Austin, TX. Juarez-Lincoln Center.

    Part of the "Comprehensive National Survey of Migrant Programs" series, this directory lists services and resources available to migrant and seasonal farmworkers during their stay in the Northwestern states of Idaho, Montana, Nebraska, North Dakota, South Dakota, Oregon, Washington, and Wyoming. Prepared for use by agencies working with these…

  7. Middle Campanian–lowermost Maastrichtian nannofossil and foraminiferal biostratigraphy of the northwestern Australian margin

    Microsoft Academic Search

    Robert J. Campbell; Richard W. Howe; John P. Rexilius

    2004-01-01

    The middle–late Campanian was marked by an increase in the bioprovinciality of calcareous microfossil assemblages into distinct Tethyan, Transitional, and Austral Provinces that persisted to the end of the Maastrichtian. The northwestern Australian margin belonged to the Transitional Province and the absence of key Tethyan marker species such as Radotruncana calcarata and Gansserina gansseri has led petroleum companies operating in

  8. Cost-Efficient Dragonfly Topology for Large-Scale Systems Northwestern University

    E-print Network

    Tomkins, Andrew

    Cost-Efficient Dragonfly Topology for Large-Scale Systems John Kim Northwestern University Evanston network. In this paper, we introduce the dragonfly topology which uses a group of high-radix routers routed packet traverses at most one global channel. By reducing global channels, a dragonfly reduces cost

  9. Response of glaciers in northwestern North America to future climate change: an atmosphere/glacier

    E-print Network

    Bhatt, Uma

    Response of glaciers in northwestern North America to future climate change: an atmosphere/glacier@gi.alaska.edu 2 HyMet, Inc., 13629 Burma Road SW, Vashon Island, WA 98070, USA ABSTRACT. The response of glaciers to changing climate is explored with an atmosphere/glacier hierarchical modeling approach, in which global

  10. This article was downloaded by: [Northwestern University] On: 28 July 2012, At: 08:25

    E-print Network

    Reber, Paul J.

    : Psychology Press Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office than a feeling: Pervasive influences of memory without awareness of retrieval Joel L. Voss a , Heather Feinberg School of Medicine, Chicago, IL, USA b Department of Psychology, Northwestern University, Evanston

  11. Investigation of upper mantle discontinuities near northwestern Pacific subduction zones using precursors to sSH

    Microsoft Academic Search

    Zhi Zhang; Thorne Lay

    1993-01-01

    Tangential component recordings of deep and intermediate depth earthquakes are analyzed for the presence of sS precursors. It is established that these precursors can be used to determine mantle stratification above subduction zones. For the northwestern Pacific area under study, oceanic crust beneath Izu Japan, continental crust under North Korea with 36 km crustal thickness and 18 percent shear wave

  12. Climatic changes in hydrological and biological characteristics of the North-Western Black Sea region

    Microsoft Academic Search

    S. Kovalyshyna; S. Ivanov; A. Matygin

    2009-01-01

    The last decades have shown considerable climatic changes in all components of the Earth System. In particular, a hydrological regime of river runoffs in the North-Western Black Sea (NWBS) shows changes on seasonal and interannual scales. A general reduction in annual runoff occurs, while winter flow increases and spring flow decreases. This can be explained by the fact that the

  13. Aerodynamic properties of agricultural and natural surfaces in northwestern Tarim Basin

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Friction velocity (u*) and aerodynamic roughness (z0) are important parameters that influence soil erosion, but no attempts have been made to quantify these parameters as affected by different land use types in the northwestern Tarim Basin. Wind velocity profiles were measured and used to determine ...

  14. Attracting a New Market to Northwestern's Undergraduate Programs: Older Women Living on the North Shore.

    ERIC Educational Resources Information Center

    Fox, Karen F. A.

    Women over age 25 represent a substantial age group that may be recruited to bolster undergraduate student recruitment efforts at Northwestern University and similar institutions of higher education. By 1990, the number of recruitable 18-year-olds will fall by 20 percent nationwide, causing financial hardship for many private colleges and…

  15. Water quality Data from two Agricultural Drainage Basins in Northwestern Indiana and

    E-print Network

    Water quality Data from two Agricultural Drainage Basins in Northwestern Indiana and Northeastern Foresman, Indiana, on May 22, 2002. Bottom photo, Sugar Creek at the State Highway 71 bridge near Raub, Indiana, on February 27, 2002. #12;In cooperation with U.S. Department of Agriculture Water-quality Data

  16. Bedout: A Possible End-Permian Impact Crater Offshore of Northwestern Australia

    Microsoft Academic Search

    L. Becker; R. J. Poreda; A. R. Basu; K. O. Pope; T. M. Harrison; C. Nicholson; R. Iasky

    2004-01-01

    The Bedout High, located on the northwestern continental margin of Australia, has emerged as a prime candidate for an end-Permian impact structure. Seismic imaging, gravity data, and the identification of melt rocks and impact breccias from drill cores located on top of Bedout are consistent with the presence of a buried impact crater. The impact breccias contain nearly pure silica

  17. Is the Northwestern Decision a Wake-Up Call for Higher Ed Institutions?

    ERIC Educational Resources Information Center

    Ambash, Joseph W.

    2014-01-01

    The recent decision by a regional director of the National Labor Relations Board (NLRB) that Northwestern University football players on scholarship are "employees" entitled to unionize under the National Labor Relations Act (NLRA) should serve as a wake-up call for higher education administrators. Part of a trend in which both the NLRB…

  18. A Quarterly Publication Featuring Achievements from Northwestern University Research Centers CenterPiece

    E-print Network

    Shahriar, Selim

    on Atomic-scale Structures 6 Drug Discovery Research Recognized by Alzheimer's Groups 9 CenterPiece LiveA Quarterly Publication Featuring Achievements from Northwestern University Research Centers Center Celebrates Multidisciplinary Research 11 University Research Centers 12 ON THE BOOKSHELF Spring 2007 Volume 6

  19. Research Scholarship, Collaboration, and Outreach at Northwestern University SpRiNg 2012 Centerpiece

    E-print Network

    Shahriar, Selim

    , research assistant professor, Cognitive Neurology and Alzheimer's Disease Center at Feinberg, [publishedResearch Scholarship, Collaboration, and Outreach at Northwestern University SpRiNg 2012 Centerpiece iN THiS iSSUE Research on the Brain HIV Risks and Prevention Solutions for Global Health Art

  20. BREEDING BIOLOGY OF THE GREAT GRAY OWL IN SOUTHEASTERN IDAHO AND NORTHWESTERN WYOMING

    Microsoft Academic Search

    ALAN B. FRANKLIN

    In this study, I documented the existence of a breeding population of Great Gray Owls (Strix nebulosa) in southeastern Idaho and northwestern Wyoming and recorded aspects of this species' breeding biology between 1980 and 1983. Thirty-eight pairs were found; 25 fledged young at least once. Fifteen nests were documented; 40% in old stick nests and 60% on tops of broken-top

  1. Secondary succession in disturbed and reclaimed sagebrush communities of northwestern Colorado

    Microsoft Academic Search

    Biondini

    1984-01-01

    The objective of this dissertation was the study of natural and induced secondary succession and soil biological activity in disturbed lands and reclaimed areas of a big sagebrush community (Artemisia tridentata) in northwestern Colorado. Four types of treatments were utilized to study soil disturbance effects in secondary succession: 1) vegetation was scraped off with as much topsoil left as possible,

  2. Global Positioning System (GPS) estimates of crustal deformation in the Marmara Sea region, Northwestern Anatolia

    Microsoft Academic Search

    Christian Straub; Hans-Gert Kahle

    1994-01-01

    In the Marmara Sea region the relative motion between the Anatolian and Eurasian lithosphere has been measured by means of the modern techniques of space geodesy using the Global Positioning System (GPS). In order to resolve in detail the kinematic field within the active earthquake belts of Northwestern Anatolia, two GPS campaigns were carried out across a dense network consisting

  3. 75 FR 7518 - Notice of Public Meeting: Sierra Front Northwestern Basin Resource Advisory Council, Nevada

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-19

    ...Northwestern Basin Resource Advisory Council, Nevada AGENCY: Bureau of Land Management, Interior...Council (RAC), will meet in Carson City, Nevada. The meeting is open to the public...5665 Morgan Mill Road, Carson City, Nevada. A field trip to locations in...

  4. Spawning migration and intraspecies differentiation of pink salmon from northwestern Sakhalin waters

    NASA Astrophysics Data System (ADS)

    Ivanov, Alexander N.; Shershnev, Alexej; Kaplanova, Nina P.; Pusankov, Konstantin L.; Ivanova, Lubov V.; Pusankova, Ekaterina N.

    2002-03-01

    Pacific salmon fishery near the northwestern Sakhalin coast is based on fish spawning both in the island and continental rivers. Salmon fishery near the Sakhalin coast of Amur Estuary has significantly lost contact with the main salmon rivers of the region. Pink salmon is the most abundant salmon species of the region rivers. Biology of the northwestern Sakhalin pink salmon is less studied of all the fishery regions on the island. So far, their migratory ways from feeding and wintering areas to the spawning rivers have not been ascertained. The results of monitoring for pink salmon have shown that by some biological indices, commercial-statistic data, and also by the data of satellites NOAA-10, NOAA-12, NOAA-14, their commercial catches near the northwestern Sakhalin are formed by fish groups migrating both through the Amur Estuary from the south, and through the Sakhalin Bay from the north. The base of spawning fish in rivers of northwestern Sakhalin is formed by the summer pink salmon migrating from the north. A preliminary computation of distinguished pink salmon groups (summer southern and northern autumn) shows a ratio 0.1:5.7:1 in odd years and 1:2:1 in even years.

  5. Quaternary stream terraces in the northwestern Sacramento Valley, Glenn, Tehama, and Shasta Counties, California

    Microsoft Academic Search

    W. C. Steele

    1979-01-01

    Stream terraces in Glenn, Tehama, and Shasta Counties, in the northwestern Sacramento Valley, California, were mapped and analyzed quantitatively. The morphology and pedology of the terraces were delineated in order to develop quantitiative methods for identification of the different terrace levels and to determine their possible origin and age relationships.

  6. The Phytophagous Insect Fauna of Scotch Thistle, Onopordum acanthium L., in Southeastern Washington and Northwestern Idaho

    Microsoft Academic Search

    J. D. WATTS; G. L. PIPER

    Scotch thistle, Onopordum acanthium L. (Asteraceae: Cardueae), a plant of Eurasian origin, has become an increasingly serious pasture, rangeland, wasteland, and roadside weed in the western United States. Prior to the implementation of a biological control agent acquisition and release program, a domestic survey was carried out at 16 sites in five southeastern Washington and northwestern Idaho counties between 1995-96

  7. Social and ecological factors influencing vigilance by northwestern crows, Corvus caurinus

    Microsoft Academic Search

    Renee L. Robinette; James C. Ha

    2001-01-01

    Vigilance behaviour is thought to be largely controlled by the threat of predation on foragers. In addition, an inverse relationship between group size and vigilance has been documented repeatedly and is known as the group size effect. We suggest that groups of beach-foraging northwestern crows are vigilant for predators and for opportunities to steal (‘scrounge’) from conspecifics. We collected data

  8. Five species of sea turtles in the northwestern Atlantic Ocean are

    E-print Network

    .S. Endangered Species Act of 1973. The loggerhead turtle (Caretta caretta) is listed as a threatened species kempii), and certain populations of the green sea turtle (Chelonia mydas) are listed as endangered671 Five species of sea turtles in the northwestern Atlantic Ocean are protected under the U

  9. Linking Research and Policy Concerns: Northwestern University's Institute for Policy Research.

    ERIC Educational Resources Information Center

    Cook, Fay Lomax; Chambers, Audrey

    2000-01-01

    Describes the founding, organization and structure, and relationship between social issues and funders of the Institute for Policy Research at Northwestern University. The institute's history and research have been marked by a commitment to societal concerns such as poverty, crime, race and inequality, social welfare policy, and community…

  10. DYNAMICS OF HABITAT USE BY SHOREBIRDS IN ESTUARINE AND AGRICULTURAL HABITATS IN NORTHWESTERN CALIFORNIA

    Microsoft Academic Search

    LINDA L. LONG; C. JOHN RALPH

    2001-01-01

    We examined shorebird use of mudflats, marsh islands, and nearby agricultural fields near Humboldt Bay in northwestern California between September 1988 and April 1989. Most species used fields for both foraging and roosting, including some species usually considered to be mudflat specialists. After seasonal rains began in late fall, Dunlins (Calidris alpina), Least Sandpipers (Calidris minutilla), Long-billed Curlews (Numenius americanus),

  11. Late quaternary vegetational change in the Kotzebue sound area, northwestern Alaska

    SciTech Connect

    Anderson, P.M.

    1985-01-01

    Two sediment cores from Kaiyak and Squirrel lakes in northwestern Alaska yielded pollen records that date to ca. 39,000 and 27,000 yr B.P., respectively. Between 39,000 and 14,000 yr B.P., the vegetation around these lakes was dominated by Gramineae and Cyperaceae with some Salix and possibly Betula nana/glandulosa forming a local, shrub component of the vegetation. Betula pollen percentages increased about 14,000 yr B.P., indicating the presence of a birch-dominated shrub tundra. Alnus pollen appeared at both sites between 9000 and 8000 yr B.P., and Picea pollen (mostly P. mariana) arrived at Squirrel Lake about 5000 yr B.P. The current forest-tundra mosaic around Squirrel Lake was established at this time, whereas shrub tundra existed near Kaiyak Lake throughout the Holocene. When compared to other pollen records from northwestern North America, these cores (1) represent a meadow component of lowland, Beringian tundra between 39,000 and 14,000 yr B.P., (2) demonstrate an early Holocene arrival of Alnus in northwestern Alaska that predates most other Alnus horizons in northern Alaska or northwestern Canada, and (3) show an east-to-west migration of Picea across northern Alaska from 9000 to 5000 yr B.P.

  12. An Upper Cambrian (Idamean) dendroid assemblage from near Smithton, northwestern Tasmania

    Microsoft Academic Search

    R. B. Rickards; P. W. Baillie; J. B. Jago

    1990-01-01

    Twelve species of dendroid graptolites belonging to three families are described from the Upper Cambrian (Idamean) of the Smithton Trough, northwestern Tasmania. Taxa include species assigned to the genera Dendrograptus, Dictyonema, Aspidograptus, Desmograptus, Callograptus, Polygonograptus, Palaeodictyota, Thallograptus, Mastigograptus, Archaeolafoea, and Aellograptus. New species include Aspidograptus smithtonensis sp. nov., Desmograptus quiltyi sp. nov., Callograptus praesalteri sp. nov., and Polygonograptus mellaensis sp.

  13. Investigations of alkali-silica reactivity in five dams in the northwestern United States

    Microsoft Academic Search

    D. Stark; G. W. DePuy

    1995-01-01

    The Bureau of Reclamation investigated alkali-silica reactivity in five dams in the Northwestern United States as part of a larger program to investigate alkali-silica reactivity in concrete dams made with concrete containing different types of reactive aggregates and exposed to different climatic conditions in various parts of the United States. The investigation included determining relative humidities of the concrete, petrographic

  14. Evaluation of Rectangular and Circular Escape Vents in the Northwestern Hawaiian Islands Lobster Fishery

    Microsoft Academic Search

    ALAN R. EVERSON; ROBERT A. SKILLMAN; JEFFREY J. POLOVINA

    1992-01-01

    Research was conducted in Hawaii during 1984-1 987 to investigate the possibility that escape vents fitted in traps used by the commercial lobster fishery in the northwestern Hawaiian Islands would reduce the catch and mortality of sublegal spiny lobsters Panulim margrnatus (<50 mm tail width) and slipper lobsters Scyllurides spp. (< 56 mm tail width) without significantly reducing legal catch.

  15. Project website: http://neutral.cs.northwestern.edu Understanding Human Mobility

    E-print Network

    Kuzmanovic, Aleksandar

    Project website: http://neutral.cs.northwestern.edu Understanding Human Mobility: A Point, Networks Group EPFL, Laboratory for Computer Communications and Applications Motivation Methodology People's mobility is driven by goals and influenced by their surroundings: points of interest (POIs) Goal: study

  16. NorthWestern Energy Community Works Scholarship for Native American Students in Engineering

    E-print Network

    Dyer, Bill

    NorthWestern Energy Community Works Scholarship for Native American Students in Engineering A special new scholarship opportunity for Native American students! In order to encourage and support Native competitively to Native American students who meet the qualifications based on submission of an application

  17. Natal philopatry and recruitment of willow ptarmigan in north central and northwestern Canada

    Microsoft Academic Search

    K. Martin; S. J. Hannon

    1987-01-01

    Natal philopatry and recruitment were measured in two populations of willow ptarmigan; one near Churchill, Manitoba and the other in northwestern British Columbia. We examined the return of tagged offspring in subsequent years with respect to geographical area, annual variation, their age when tagged, their sex, their body weight, age and number of their parents, and time of hatch (first

  18. Provenance and palaeogeographic implications of Eocene–Oligocene sedimentary rocks in the northwestern Basin and Range

    Microsoft Academic Search

    Anne E. Egger; Joseph P. Colgan; Carly York

    2009-01-01

    A thick sequence of uppermost Eocene to lower Oligocene volcaniclastic and sedimentary rocks is exposed at the base of the Warner Range in northeastern California. This isolated exposure provides insight into the palaeogeographic setting of the northwestern Basin and Range during this time period. Significant thinning of the unit over 35 km of lateral exposure and predominantly volcanic clast compositions suggest

  19. Northwestern University Archives Evanston, Illinois Lewis Elmer Sims (1855-1937) Papers, 1874-1977

    E-print Network

    Northwestern University Archives Evanston, Illinois Lewis Elmer Sims (1855-1937) Papers, 1874-1977 Series 31/6/96 1 Box 1 Biography Lewis Elmer Sims was born in 1855 and grew up in the small town to San Anselmo, California. He died in 1937. Description of the Series The Lewis Elmer Sims papers

  20. The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA

    E-print Network

    The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA Heather L. Welch & Christopher T. Green & Richard H. Coupe Abstract Agricultural contamination of groundwater collected from a shallow water-table well, a vertical profile of temporary sampling points, and a nearby

  1. Modern pollen dynamics and surficial sedimentary processes at Lake Tyrrell, semi-arid northwestern Victoria, Australia

    Microsoft Academic Search

    J. G. Luly

    1997-01-01

    Salt (playa) lakes provide an opportunity to obtain long records of vegetational change from arid areas. This paper presents results of a study of modern pollen dynamics at Lake Tyrrell, a large salt lake in semi-arid northwestern Victoria, Australia. Results suggest that the lake receives an airborne pollen flux which broadly reflects the nature of the regional vegetation. Waterborne pollen

  2. QUATERNARY PALYNOFLORAS AND PALEOCLIMATE OF THE QAIDAM BASIN, QINGHAI PROVINCE, NORTHWESTERN CHINA

    Microsoft Academic Search

    JIANG DEXIN; ELEANORA I. ROBBINS

    2000-01-01

    A cool, arid climate featuring steppe vegetation characterizes the modern day temperate zone of northwestern China. In contrast, palynofloras indicate that the paleoclimate there was warmer and wetter during the Pleistocene than during the Holocene. To document vegetational and climatic changes during the Quater- nary, fossil pollen and spores were systematically studied in sediments from the Qaidam Basin in the

  3. Quaternary palynofloras and paleoclimate of the qaidam basin, qinghai province, northwestern China

    Microsoft Academic Search

    Jiang Dexin; Eleanora I. Robbins

    2000-01-01

    A cool, arid climate featuring steppe vegetation characterizes the modem day temperate zone of northwestern China. In contrast, palynofloras indicate that the paleoclimate there was warmer and wetter during the Pleistocene than during the Holocene. To document vegetational and climatic changes during the Quaternary, fossil pollen and spores were systematically studied in sediments from the Qaidam Basin in the Qinghai

  4. Response of maize (Zea mays) to phosphorus application on basaltic soils in Northwestern Cameroon

    Microsoft Academic Search

    O. A. Osiname; F. Meppe; L. Everett

    2000-01-01

    A field trial was conducted on two P sorptive, basaltic soils commonly used for maize production in Northwestern Cameroon. The objective was to determine the maintenance P rates required for adequate P supply in the soils for maize after initial capital dressing applications of P (0, 22, 44, 88 and 132 kg ha-1) in 1991. These were followed by three

  5. Aspects of the ecology of coastal tundra raised beach ridges in Northwestern Ontario

    Microsoft Academic Search

    Douglas William Larson

    1975-01-01

    The structure of lichen dominated vegetation is described within a series of raised beach ridges found along the strip of coastal tundra in northwestern Ontario. The patterns of distribution of the most abundant species correlated with the topographic influences of individual beach ridges more than with the influences of the general developmental sequence of vegetation from the coast of Hudson

  6. Review of Gizzard Shad Population Dynamics at the Northwestern Edge of Its Range

    Microsoft Academic Search

    Melissa R. Wuellne R; W. Willis

    Gizzard shad Dorosoma cepedianum is widely distributed in North America, and South Dakota marks the northwestern edge of its native range. To date, most research regarding population dynamics of gizzard shad has been con- ducted in more southerly waters. We reviewed the dynamics and biology of giz- zard shad populations in South Dakota and compared this information with that reported

  7. The Silurian play in the Tazhong Uplift, Tarim Basin, northwestern China

    Microsoft Academic Search

    Xiu Xiang Lu; Qiuhai Fan; Fengyun Zhao; Qinghua Wang; Qilai Xie; Haijur Yang

    2007-01-01

    Silurian sandstone reservoirs in the Tazhong Uplift in the Tarim Basin, northwestern China are rich in bitumen and movable oil. Analysis of the biological markers indicates that the bitumen and movable oil came from two source rocks in the Cambrian and Middle\\/Upper Ordovician system, both of which are belong to marine facies. The Silurian system experienced three stages of oil

  8. A Collaborative Model for Teaching E-Resources: Northwestern University's Graduate Training Day

    ERIC Educational Resources Information Center

    Lightman, Harriet; Reingold, Ruth N.

    2005-01-01

    The authors report on the planning, execution, and future of Northwestern University's Introduction to Electronic Resources/Humanities Computing Training Day, a mandatory one-day set of classes for first-year doctoral students in humanities disciplines. The project is a collaborative effort among the Office of the Dean of the Weinberg College of…

  9. Northwestern University Archives Evanston, Illinois AGNES JONES CASHMAN (1901-1989) PAPERS, 1918-1960

    E-print Network

    . In 1927 Jones became an instructor in physical education and hygiene at Northwestern teaching a variety in four main categories: biographical materials, education files, correspondence, and teaching files to her master's thesis. Three folders of her lecture notes on Lew Sarett's courses in poetry have been

  10. ATMOSPHERIC, CLIMATIC, AND ECOLOGICAL CONTROLS ON EXTREME WILDFIRE YEARS IN THE NORTHWESTERN UNITED STATES

    Microsoft Academic Search

    Ze'ev Gedalof; David L. Peterson; Nathan J. Mantua

    2005-01-01

    Wildland fire is an important disturbance agent in forests of the American Northwest. Historical fire suppression efforts have contributed to an accumulation of fuels in many Northwestern forests and may result in more frequent and\\/or more severe wildfire events. Here we investigate the extent to which atmospheric and climatic variability may contribute to variability in annual area burned on 20

  11. Wildfire risk in the wildlandurban interface: A simulation study in northwestern Wisconsin

    E-print Network

    Radeloff, Volker C.

    Wildfire risk in the wildland­urban interface: A simulation study in northwestern Wisconsin Avi Bar (WUI) (Radeloff et al., 2005). Potentially high wildfire risk in the WUI raises the question of how to minimize wildfire risk to human lives and properties, and this requires knowledge about the current

  12. Northwestern scientists develop new drug that prevents spread of human prostate cancer cells in mice

    Cancer.gov

    A new drug developed by Northwestern Medicine scientists prevented human prostate cancer cells transplanted into mice from spreading to other tissues without any toxic effects to normal cells or tissues. The drug turns off the "go" switch in the cancer cells and immobilizes them.

  13. THE IMPACTS OF BOTTOMFISHING ON RAITA AND WEST ST. ROGATIEN BANKS IN THE NORTHWESTERN HAWAIIAN ISLANDS

    Microsoft Academic Search

    CHRISTOPHER KELLEY; WALTER IKEHARA

    The authors assessed the impacts of bottomfishing in the Raita and West St. Rogatien Bank Reserve Preservation Areas (RPAs) in the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve (NWHICRER). The executive order creating NWHICRER stipulates that bottomfishing will be allowed in these RP As only if it is determined not to be having an adverse impact on their resources. In

  14. Feeding ecology of striped dolphins, Stenella coeruleoalba, in the north-western

    E-print Network

    Stockin, Karen

    Feeding ecology of striped dolphins, Stenella coeruleoalba, in the north-western Mediterranean Sea, Aberdeenshire, AB41 6AA UK The feeding ecology of striped dolphin, Stenella coeruleoalba, in the north measured in skin and muscle tissues of stranded and by-caught dolphins from six geographical areas

  15. COLLINSITE IN HYDROTHERMAL ASSEMBLAGES RELATED TO CARBONATITES IN THE KOVDOR COMPLEX, NORTHWESTERN RUSSIA

    Microsoft Academic Search

    RUSLAN P. LIFEROVICH; YAKOV A. PAKHOMOVSKY; ALLA N. BOGDANOVA; ELENA G. BALAGANSKAYA; KAUKO V. O. LAAJOKI; S. Gehor; NIKITA V. CHUKANOV

    2001-01-01

    Several generations of collinsite were formed during the hydrothermal alteration of phoscorite and dolomite carbonatite in the Kovdor alkaline-ultramafic complex, northwestern Russia. The collinsite at this locality shows isomorphic substitution of Sr fo r Ca at the A crystallographic site , which is atypical both for this species and for the entire fairfieldite group. The Sr content reaches 0.74 atoms

  16. Northwestern University Archives Evanston, Illinois OLIVER MARCY (1820-1899) PAPERS

    E-print Network

    posts. In addition to the sciences, Marcy taught natural theology, moral science, philosophy, logic Seminary in Dutchess County, New York. Marcy took the position of professor of natural science, and Greek. Marcy established the Northwestern University Museum of Natural History and served as its curator

  17. GENETIC STRUCTURE OF SENSITIVE AND ENDANGERED NORTHWESTERN BADGER POPULATIONS (TAXIDEA TAXUS TAXUS AND T. T. JEFFERSONII)

    Microsoft Academic Search

    Christopher J. Kyle; Richard D. Weir; Nancy J. Newhouse; Helen Davis; Curtis Strobeck

    2004-01-01

    American badgers (Taxidea taxus) are semifossorial carnivores present in many arid regions of central and western North America. Negative demographic trends have prompted recent discussion concerning their conservation status in the northwestern portion of their range. As such, further information regarding the metapopulation structure of this species and factors affecting dispersal is needed. To provide a preliminary assessment of genetic

  18. NOrtHWesterN UNiversity Supplement to the 201112 Common Application please print clearly.

    E-print Network

    ­ ­ Gender Female Male Date of birth / / (oPTIoNAl) MoNTH DAy yEAR personal information E-mail address MUST applying to Northwestern this year? Yes No If yes, are you twins? Yes No Relative(s) who are attending

  19. Petrography of Neocomian sandstones in western Brooks Range, and Tunalik, Klondike and Burger Wells, northwestern Arctic Slope-Chukchi Sea

    SciTech Connect

    Mowatt, T.C.; Banet, A.C. [Bureau of Land Management, Anchorage, AK (United States); Mull, C.G. [Alaska Division of Geological and Geophysical Surveys, Fairbanks, AK (United States); Wilson, M.D. [Consultant, Golden, CO (United States); Reeder, J.W. [Alaska Division of Geological and Geophysical Surveys, Eagle River, AK (United States)

    1995-04-01

    Petrographic examinations were performed on Neocomian sandstones of the Ellesmerian sequence in outcrop in the western Brooks Range and from cuttings and cores from wells in the northwestern part of the National Petroleum Reserve in Alaska (NPRA) and adjacent Chukchi Sea that are probably coeval with the Kuparuk River Formation in the Prudhoe Bay area. Close similarities are recognized among samples from the 300 foot thick Tingmerkpuk Sandstone, which crops out in the western DeLong Mountains, and samples of apparently coeval intervals in the Tunalik, Burger, and Klondike wells. All are quartzose sublitharenities-quartzarenities that are dominantly fine to very-fine grained, with a few medium-to-coarse-grained sands. Grains are generally well-to very well-sorted, with minor detrital clays. Other framework grains include minor to trace amounts of cherts, argillaceous rocks, carbonate glauconite are commonly present, as rounded peloids, sometimes deformed between more rigid grains. Cements are principally quartz and/or carbonates, with diagenetic clays in a few samples. Notable porosity occurs in some core from the Tunalik well, but is not obvious in these cuttings or outcrop samples (other data indicate porosity in both other wells). Although petrographic characteristics alone do not establish a correlation among these widely spaced control points, the similarities support a common tectonic/stratigraphic framework for the Neocomian in all the areas. Regional stratigraphic studies of these sandstones suggest potential for significant reservoir quality associated with possible stratigraphic traps in the subsurface.

  20. Hiatus-related processes: Paleokarst, paleosol, and a transgressive rocky shore from the Mississippian-Pennsylvanian unconformity in northwestern Arkansas

    SciTech Connect

    Webb, G.E. (Texas A and M Univ., College Station, TX (United States). Dept. of Geology)

    1992-01-01

    Unconformities are often considered only as stratigraphic gaps or sequence boundaries despite the evidence of climate- and paleogeography-linked hiatus processes that they may preserve. In northwestern Arkansas, progressively older Paleozoic strata are truncated to the north and west by the Mississippian-Pennsylvanian unconformity. In southern Washington County, Arkansas, the partly truncated Chesterian Pitkin Limestone is unconformably overlain by the Cane Hill Member of the Morrowan Hale Formation. The top of the Pitkin Limestone locally consists of cryptokarst with abundant solution pipes and lithoclasts formed by dissolution fragmentation. These lithoclasts, and surrounding clay dissolution residue, form regolith that is increasingly altered by pedogenic calcretization towards the top. The basal conglomerate of the overlying Cane Hill Member is interpreted as a transgressive boulder shore deposit. Conglomerate clasts consist of Pitkin cobbles and boulders that were derived from the erosion of local Pitkin highs.'' Most clasts are heavily bored on all sides by a variety of Trypanites and acrothoracian barnacle borings. Encrusting bryozoans and the encrusting tabulate coral, Michelinia, complete the rocky shore fauna. Preservation of paleokarst and poorly-indurated paleosol in low-lying areas around the eroded Pitkin highs,'' suggests that: (1) the vast majority of missing Pitkin was removed from the section by karstification during the hiatus, and not by erosion during the subsequent transgression; (2) transgression was too rapid to effectively scour the transgressed surface to bed rock; and (3) the net nearshore sediment transport direction was shoreward as the sea transgressed.

  1. Aerosol composition in the drylands of Northwestern China

    NASA Astrophysics Data System (ADS)

    Ming-xing, Wang; Winchester, John W.; Shao-meng, Li

    1987-03-01

    Aerosols from far northwestern China have been investigated to characterize sulfur in relation to other elements in a northern hemisphere temperate latitude continental location remote form anthropogenic air pollution SO 2 sources. The importance of sulfur associated with soil-derived particles relative to any independently-occurring airborne sulfate was emphasized in the study. The first can result either from chemical and biological processes in uppermost soil layers during precipitation and evaporation or by attachment of gaseous sulfur species to suspended dust. The second, at least in polluted regions, can result from heterogeneous or homogeneous-atmospheric chemical reactions. The study was based on continuous time sequence aerosol sampling on 0.4 ?m Nuclepore filter in a linear streaker and elemental analysis of 4-h steps by PIXE. Samples were collected August 8-22. 1980, in Xinjiang at Tianchi, a mountain lake resort near Urumqi high in the Bogda Shan of the Tian Shan Range situated above the semiarid Dzungarian plain that extends to the north. Statistical relationships in the set of 86 sequential measurements of 12 elements were found by absolute factor analysis, stepwise regression analysis, and Fourier analysis of time series. The study provides a test of alternative statistical methods for obtaining atmospheric process information from PIXE analysis data. Three distinct aerosol components could be distinguished. Two of these explained 95-99% of the variance of Mg. Al, Si, S, Cl, K, Ca, Ti. and Fc and 85% of Mn and P, indicating both the coherence of soil-related elements and a strong association of both S and Cl with them. Some S was also present as a constant background unrelated to concentration variations of dust. Zn, measured with less analytical accuracy than other elements, was not as well accounted for by these components. Of special interest is the presence of two distinct dust types, both of which were enriched in sulfur, chlorine, and phosphorus relative to average earth crust composition. The type with highest S, Cl, and P enrichments was also depleted in Fe, Mn, and Ti relative to average earth crust. It exhibited concentration maxima every 10-15 h and may be formed locally by dispersion of soil during turbulent wind conditions. The other type, which varied diurnally, may represent average aerosol over the Dzungarian plain that is transported by day during upslope northerly flow. The average measured sulfur concentration, as well as that calculated to be present in each of its three components, was higher than has been reported for southern hemisphere continental atmospheres. High concentrations of S, Cl, and P and their associations with crustal elements are consistent with an enrichment in soils before dust suspension by chemical or biological processes in soils under semiarid conditions. The scavenging of reactive gases by suspended particles may contribute as well, though to a limited degree, in this remote area. Since depostion and resuspension of dust over arid lands is considerable, a large flux of aerosol S and Cl exchange across the Xinjiang air-soil interface is implied.

  2. Aeolian transport pathways along the transition from Tibetan highlands towards northwestern Chinese deserts

    NASA Astrophysics Data System (ADS)

    Nottebaum, Veit; Lehmkuhl, Frank; Stauch, Georg

    2014-05-01

    The identification and semi-quantification of aeolian transport pathways enhances the understanding of aeolian sediment archive formation and thus supports reliability and explanatory power concerning palaeoenvironmental reconstructions. Grain size analysis of 279 surface sediment samples from the transition of Tibetan highlands (Qilian Shan) towards northwestern Chinese deserts allows the differentiation of contributing pathways among three types of aeolian sediments: silty loess, sandy loess, and aeolian sands. The study area exhibits a high diversity of geomorphological surfaces due to varieties in relief, elevation and climatic conditions. Therefore, it provides the opportunity to investigate the characteristics of sediments in different geomorphological settings. Using the peaks of grain size frequency's standard deviation of primary loess allows identification of the most sensitive fractions to varying accumulation conditions. mU/fS-ratio (7 - 13 ?m / 58 - 84 ?m) of primary silty loess relates the far-travelled dust proportion to the locally transported fine sand component. In vicinity to fluvial channels in the foreland mU/fS-values are significantly decreased, whereas mU/fS-values increase with altitude (r2 = 0.74). This indicates higher contribution of long distance transport compared to lower regions. A prominent increase of mU/fS-values above 3000 m asl likely indicates an increasing contribution of fine and medium silt particles transported by Westerlies in higher altitudes. In contrast, lower areas seem to be more strongly influenced by low altitude monsoon currents (NW-Winter- / SE-summer monsoon). The difference in grain size properties is additionally enhanced by the contrasting geomorphologic settings along the mountain declivity: Plain foreland alluvial fans support fine sand supply and availability whereas steep high mountain topography provides only limited potential for fine sand deflation. Similarly, the relatively low relief in intramontane basins leads to fluvial sediment aggradation and allows comparably high fine sand deflation. This supports the formation of sandy loess in these regions and on foreland alluvial fans, whereas in contrast, sandy loess is absent in the high mountain geomorphologic setting. Aeolian sand distribution in the study area indicates a high dependence on sand supply. In eastern forelands perennial Hei River and northerly bordering Badain Jaran desert are important sand sources and hence support dune field formation in the northern Qilian Shan foreland (Hexi Corridor). In contrast, western forelands, dominated by gravel gobi surfaces, exhibit very few aeolian sand accumulations on the surface. The latter area shows only ephemeral discharge and is lacking large sand source areas. Therefore, although sufficient wind speeds occur, aeolian sand transport is limited due to restricted sand supply. Concluding, the medium scale geomorphological setting (103 m) exerts a rather underestimated influence when reconstructing aeolian transport processes. However, considering the spatial distribution of aeolian sediments in combination with their grain size distribution allows the reconstruction of dominant transport pathways.

  3. Cenozoic orogenic phases in the northwestern framing of the Pacific

    NASA Astrophysics Data System (ADS)

    Gladenkov, Yu. B.

    2013-07-01

    Several Cenozoic orogenic phases marked by deformations and rearrangement of geological structures, by unconformities and hiatuses, and by the cyclicity of ancient sedimentary and volcanic formations are distinguished in the vast territory of a transitional zone between Northeast Asia and the Pacific, from Sakhalin in the south to Chukotka in the north.

  4. Pre-, syn-, and postcollisional stratigraphic framework and provenance of upper triassic-upper cretaceous strata in the northwestern talkeetna mountains, alaska

    USGS Publications Warehouse

    Hampton, B.A.; Ridgway, K.D.; O'Neill, J. M.; Gehrels, G.E.; Schmidt, J.; Blodgett, R.B.

    2007-01-01

    Mesozoic strata of the northwestern Talkeetna Mountains are located in a regional suture zone between the allochthonous Wrangellia composite terrane and the former Mesozoic continental margin of North America (i.e., the Yukon-Tanana terrane). New geologic mapping, measured stratigraphic sections, and provenance data define a distinct three-part stratigraphy for these strata. The lowermost unit is greater than 290 m thick and consists of Upper Triassic-Lower Jurassic mafic lavas, fossiliferous limestone, and a volcaniclastic unit that collectively we informally refer to as the Honolulu Pass formation. The uppermost 75 m of the Honolulu Pass formation represent a condensed stratigraphic interval that records limited sedimentation over a period of up to ca. 25 m.y. during Early Jurassic time. The contact between the Honolulu Pass formation and the overlying Upper Jurassic-Lower Cretaceous clastic marine strata of the Kahiltna assemblage represents a ca. 20 m.y. depositional hiatus that spans the Middle Jurassic and part of Late Jurassic time. The Kahiltna assemblage may to be up to 3000 m thick and contains detrital zircons that have a robust U-Pb peak probability age of 119.2 Ma (i.e., minimum crystallization age/maximum depositional age). These data suggest that the upper age of the Kahiltna assemblage may be a minimum of 10-15 m.y. younger than the previously reported upper age of Valanginian. Sandstone composition (Q-43% F-30% L-27%-Lv-71% Lm-18% Ls-11%) and U-Pb detrital zircon ages suggest that the Kahiltna assemblage received igneous detritus mainly from the active Chisana arc, remnant Chitina and Talkeetna arcs, and Permian-Triassic plutons (Alexander terrane) of the Wrangellia composite terrane. Other sources of detritus for the Kahiltna assemblage were Upper Triassic-Lower Jurassic plutons of the Taylor Mountains batholith and Devonian-Mississippian plutons; both of these source areas are part of the Yukon-Tanana terrane. The Kahiltna assemblage is overlain by previously unrecognized nonmarine strata informally referred to here as the Caribou Pass formation. This unit is at least 250 m thick and has been tentatively assigned an Albian-Cenomanian-to-younger age based on limited palynomorphs and fossil leaves. Sandstone composition (Q-65% F-9% L-26%-Lv-28% Lm-52% Ls-20%) from this unit suggests a quartz-rich metamorphic source terrane that we interpret as having been the Yukon-Tanana terrane. Collectively, provenance data indicate that there was a fundamental shift from mainly arc-related sediment derivation from sources located south of the study area during Jurassic-Early Cretaceous (Aptian) time (Kahiltna assemblage) to mainly continental margin-derived sediment from sources located north and east of the study area by Albian-Cenomanian time (Caribou Pass formation). We interpret the threepart stratigraphy defined for the northwestern Talkeetna Mountains to represent pre- (the Honolulu Pass formation), syn- (the Kahiltna assemblage), and post- (the Caribou Pass formation) collision of the Wrangellia composite terrane with the Mesozoic continental margin. A similar Mesozoic stratigraphy appears to exist in other parts of south-central and southwestern Alaska along the suture zone based on previous regional mapping studies. New geologic mapping utilizing the three-part stratigraphy interprets the northwestern Talkeetna Mountains as consisting of two northwest-verging thrust sheets. Our structural interpretation is that of more localized thrust-fault imbrication of the three-part stratigraphy in contrast to previous interpretations of nappe emplacement or terrane translation that require large-scale displacements. Copyright ?? 2007 The Geological Society of America.

  5. Diagenetic history of the Korallenoolith (Malm) of northwestern Germany: Implications from in-situ trace element and isotopic studies

    NASA Astrophysics Data System (ADS)

    Bruhn, Frank; Veizer, Ján; Buhl, Dieter; Meijer, Jan

    2005-04-01

    We have collected rock samples from the abandoned Konrad iron ore mine near Salzgitter/Germany, to elucidate the diagenetic history of the Korallenoolith formation in northwestern Germany. Petrographic and cathodoluminescence investigations showed that the rocks contain a wide range of particles, from primary biogenic material to various generations of interparticle cements and cements in fissures and fractures. The diagenetic environment of cement precipitation was reconstructed using in-situ trace element microanalyses with PIXE, using the Bochum proton microprobe. Furthermore, the different components were analysed for their radiogenic ( 87Sr/ 86Sr) isotope signatures. 'Rim cements' around echinoid fragments display several stages of cement precipitation. Early cement generations show high Sr concentrations and low 87Sr/ 86Sr values. In contrast, later generations have relatively low Sr values, around 300 ppm, and iron concentrations of up to 3%. Fissure cements represent an even later stage of diagenetic history. They consist of calcite, anhydrite and celestite and are characterised by significantly higher 87Sr/ 86Sr values. The results of combined trace element and isotopic measurements indicate that the biogenic material was deposited in a shallow marine environment with normal salinity and a relatively high primary availability of iron. The early generations of diagenetic cements have similar, marine, signatures and were therefore precipitated in a closed system, where the trace element and isotopic properties were inherited from the dissolved precursor phases. In contrast, the later generations of rim cements and particularly the fissure cements show completely different and variable chemical signatures. They were precipitated in an open system from formation waters.

  6. Northwestern University Archives Evanston, Illinois Melvin A. Pingree (1845-1866) Photograph Album, circa 1865-1866

    E-print Network

    secretary to James Harlan, then Andrew Johnson's Secretary of the Interior. Pingree died of yellow fever of typhoid fever on July 10, 1864, barely two months after enlisting. 6 Unknown Unmarked N/A #12;Northwestern

  7. 33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  8. 33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  9. 33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  10. 33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  11. 33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  12. Characterization of Most Promising Sequestration Formations in the Rocky Mountain Region (RMCCS)

    SciTech Connect

    McPherson, Brian; Matthews, Vince

    2013-09-30

    The primary objective of the “Characterization of Most Promising Carbon Capture and Sequestration Formations in the Central Rocky Mountain Region” project, or RMCCS project, is to characterize the storage potential of the most promising geologic sequestration formations within the southwestern U.S. and the Central Rocky Mountain region in particular. The approach included an analysis of geologic sequestration formations under the Craig Power Station in northwestern Colorado, and application or extrapolation of those local-scale results to the broader region. A ten-step protocol for geologic carbon storage site characterization was a primary outcome of this project.

  13. A quantitative study of fish populations associated with a platform within Buccaneer Oil Field, northwestern Gulf of Mexico

    E-print Network

    Putt, Russell Eugene

    1982-01-01

    A QUANTITATIVE STUDY OF FISH POPULATIONS ASSOCIATED WITH A PLATFORM WITHIN BUCCANEER OIL FIELD, NORTHWESTERN GULF OF MEXICO A Thesis by RUSSELL EUGENE PUTT, JR. Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August 1982 Major Subject: Oceanography A QUANTITATIVE STUDY OF FISH POPULATIONS ASSOCIATED WITH A PLATFORM WITHIN BUCCANEER OIL FIELD, NORTHWESTERN GULF OF MEXICO A Thesis by RUSSELL EUGENE PUTT, JR...

  14. Abundances of northwestern salamander larvae in montane lakes with and without fish, Mount Rainier National Park, Washington

    USGS Publications Warehouse

    Larson, Gary L.; Hoffman, Robert L.

    2002-01-01

    In Mount Rainier National Park, the northwestern salamander usually inhabits relatively large and deep lakes and ponds (average size = 0.3 ha; average depth > 2 m) that contain flocculent, organic bottom sediments and abundant coarse wood. Prior to 1970, salmonids were introduced into many of the park's lakes and ponds that were typical habitat of the northwestern salamander. The objective of this study was to compare, in lakes and ponds with suitable habitat characteristics for northwestern salamanders, the observed abundances of larvae in takes and ponds with and without these introduced salmonids. Day surveys of 61 lakes were conducted between 1993 and 1999. Fish were limited to takes and ponds deeper than 2 in. For the 48 lakes and ponds deeper than 2 in (i.e., 25 fishless lakes and 23 fish lakes), the mean and median observed abundances of northwestern salamander larvae in fishless lakes and ponds was significantly greater than the mean and median observed abundances of larvae in lakes and ponds with fish. Northwestern salamander larvae were not observed in 11 fish lakes. These lakes were similar in median elevation, surface area, and maximum depth to the fishless lakes. The 12 fish lakes with observed larvae were significantly lower in median elevation, larger in median surface area, and deeper in median maximum depth than the fishless lakes. Low to null observed abundances of northwestern salamander larvae in lakes and ponds with fish were attributed to a combination of fish predation of larvae and changes in larval behavior.

  15. Galaxy Formation

    E-print Network

    Eric Gawiser

    2005-12-15

    I summarize current knowledge of galaxy formation with emphasis on the initial conditions provided by the Lambda CDM cosmology, integral constraints from cosmological quantities, and the demographics of high-redshift protogalaxies. Tables are provided summarizing the number density, star formation rate and stellar mass per object, cosmic star formation rate and stellar mass densities, clustering length and typical dark matter halo masses for Lyman break galaxies, Lyman alpha emitting galaxies, Distant red galaxies, Sub-millimeter galaxies, and Damped Lyman alpha absorption systems. I also discuss five key unsolved problems in galaxy formation and prognosticate advances that the near future will bring.

  16. Geochemical soil sampling for deeply-buried mineralized breccia pipes, northwestern Arizona

    USGS Publications Warehouse

    Wenrich, K.J.; Aumente-Modreski, R. M.

    1994-01-01

    Thousands of solution-collapse breccia pipes crop out in the canyons and on the plateaus of northwestern Arizona; some host high-grade uranium deposits. The mineralized pipes are enriched in Ag, As, Ba, Co, Cu, Mo, Ni, Pb, Sb, Se, V and Zn. These breccia pipes formed as sedimentary strata collapsed into solution caverns within the underlying Mississippian Redwall Limestone. A typical pipe is approximately 100 m (300 ft) in diameter and extends upward from the Redwall Limestone as much as 1000 m (3000 ft). Unmineralized gypsum and limestone collapses rooted in the Lower Permian Kaibab Limestone or Toroweap Formation also occur throughout this area. Hence, development of geochemical tools that can distinguish these unmineralized collapse structures, as well as unmineralized breccia pipes, from mineralized breccia pipes could significantly reduce drilling costs for these orebodies commonly buried 300-360 m (1000-1200 ft) below the plateau surface. Design and interpretation of soil sampling surveys over breccia pipes are plagued with several complications. (1) The plateau-capping Kaibab Limestone and Moenkopi Formation are made up of diverse lithologies. Thus, because different breccia pipes are capped by different lithologies, each pipe needs to be treated as a separate geochemical survey with its own background samples. (2) Ascertaining true background is difficult because of uncertainties in locations of poorly-exposed collapse cones and ring fracture zones that surround the pipes. Soil geochemical surveys were completed on 50 collapse structures, three of which are known mineralized breccia pipes. Each collapse structure was treated as an independent geochemical survey. Geochemical data from each collapse feature were plotted on single-element geochemical maps and processed by multivariate factor analysis. To contrast the results between geochemical surveys (collapse structures), a means of quantifying the anomalousness of elements at each site was developed. This degree of anomalousness, named the "correlation value", was used to rank collapse features by their potential to overlie a deeply-buried mineralized breccia pipe. Soil geochemical results from the three mineralized breccia pipes (the only three of the 50 that had previously been drilled) show that: (1) Soils above the SBF pipe contain significant enrichment of Ag, Al, As, Ba, Ga, K, La, Mo, Nd, Ni, Pb, Sc, Th, U and Zn, and depletion in Ca, Mg and Sr, in contrast to soils outside the topographic and structural rim; (2) Soils over the inner treeless zone of the Canyon pipe show Mo and Pb enrichment anf As and Ga depletion, in contrast to soils from the surrounding forest; and (3) The soil survey of the Mohawk Canyon pipe was a failure because of the rocky terrane and lack of a B soil horizon, or because the pipe plunges. At least 11 of the 47 other collapse structures studied contain anomalous soil enrichments similar to the SBF uranium ore-bearing pipe, and thus have good potential as exploration targets for uranium. One of these 11, #1102, does contain surface mineralized rock. These surveys suggest that soil geochemical sampling is a useful tool for the recognition of many collapse structures with underlying ore-bearing breccia pipes. ?? 1994.

  17. The Hei River Basin in northwestern China - tectonics, sedimentary processes and pathways

    NASA Astrophysics Data System (ADS)

    Rudersdorf, Andreas; Nottebaum, Veit; Schimpf, Stefan; Yu, Kaifeng; Hartmann, Kai; Stauch, Georg; Wünnemann, Bernd; Reicherter, Klaus; Diekmann, Bernhard; Lehmkuhl, Frank

    2014-05-01

    The Hei River Basin (catchment area of c. 130,000 km²) is situated at the transition between the northern margin of the Tibetan Plateau and the southern slopes of Gobi-Tien-Shan. As part of the northwestern Chinese deserts, the Ejina Basin (Gaxun Nur Basin) constitutes the endorheic erosion base of the drainage system. The basin - hosting the second largest continental alluvial fans in the world, is tectonically strongly shaped by the Gobi belt of left-lateral transpression. The tectonic setting in combination with competing climatic driving forces (Westerlies and summer/winter monsoon currents) has supported the formation of a valuable long-time sediment archive comprises at least the last 250,000 yrs. of deposition. It is composed by the interplay of eolian, fluvial and lacustrine sedimentation cycles and today is dominated by widespread (gravel) gobi surfaces, insular dune fields and shallow evaporitic playa areas. Thus, it provides excellent conditions to investigate tectonic evolution and Quaternary environmental changes. Recently, geomorphological, geophysical, neotectonic and mineralogical studies have enhanced the understanding of the environmental history and the modern depositional environment. Moreover, the role of the Hei River Basin as an important source area of silt particles which were later deposited on the Chinese Loess Plateau is evaluated. Therefore, a 230 m long drill core, sediment sections and ca. 700 surface samples throughout the whole catchment and basin were analyzed. Instrumental and historical seismicity are very low, but the proximity to active fault zones and dating irregularities in earlier publications indicate evidence for deformation in the study area. Despite flat topography, indications of active tectonics such as fault-related large-scale lineations can be observed. Seismically deformed unconsolidated lacustrine deposits (seismites), presumably of Holocene age, are evident and must be related to the nearby faults. The upper catchment is represented by the Qilian Shan mountain range and its immediate foreland. Here, a tripartite altitudinal distribution of terrestrial sediment archives is evident, which is representative of catchment-wide sedimentological processes. Insights into their formation mechanisms, therefore, add valuable perspective regarding the reconstruction of sedimentological and paleoenvironmental conditions in the depositional area of the Hei River Basin. For the characterization of provenance and dispersal of Quaternary sediments in relation to the modern depositional environment, over 200 surface samples from the whole catchment were analyzed using XRD and XRF measurements on the clay fractions, heavy minerals and bulk sediments. The clay mineral results in-particular show that it is possible to discriminate between the chlorite rich metamorphic sediments originating from greenschist bearing rocks in the Qilian Shan Mountain Range in the south, and the more intrusive rocks from the Bei Shan Mountain Range west of the Hei River Basin. Additionally, these two main sources reflect different transportation processes; the Qilian Shan sediments are mainly transported by the rivers Heihe and Beida He, and the deposition of the Bei Shan sediments is mainly driven by wind or local runoff. Grain size results of primary loess deposits indicate different eolian transport pathways, i.e., far-travelled dust input (medium silty) vs. local deflation from active fluvial channels (fine sandy). Along the altitudinal transect, the varying geomorphological settings exert a significant influence on the grain size composition showing an increased contribution of far-travelled dust at higher altitudes.

  18. Is There any Relationship Between the Santa Elena Depression and Chicxulub Impact Crater, Northwestern Yucatan Peninsula, Mexico?

    NASA Astrophysics Data System (ADS)

    Lefticariu, L.

    2005-05-01

    The Terminal Cretaceous Chicxulub Impact Crater had a strong control on the depositional and diagenetic history of the northern Yucatan Platform during most of the Cenozoic Era. The Chicxulub Sedimentary Basin (henceforth Basin), which approximately coincides with the impact crater, is circumscribed by a concentration of karstic sinkholes known as the Ring of Cenotes. Santa Elena Depression (henceforth Depression) is the name proposed for the bowl-shaped buried feature, first contoured by geophysical studies, immediately south of the Basin, in the area where the Ticul 1 and UNAM 5 wells were drilled. Lithologic, petrographic, and biostratigraphic data on PEMEX, UNAM, and ICDP cores show that: 1) Cenozoic deposits are much thicker inside the Basin than inside the Depression, 2) in general, the Cenozoic formations from inside the Depression are the thickest among those outside the Basin, 3) variably dolomitized pelagic or outer-platform wackestone or mudstone occur both inside the Basin and Depression, 4) the age of the deeper-water sedimentary carbonate rocks is Paleocene-Eocene inside the Basin and Paleocene?-Early Eocene inside the Depression, 5) the oldest formations that crop out are of Middle Eocene age at the edge of the Basin and Early-Middle Eocene age inside the Depression, 6) saline lake deposits, that consist chiefly of anhydrite, gypsum, and fine carbonate, and also contain quartz, chert, clay, zeolite, potassium feldspar, pyrite, and fragments of wood, are present in the Cenozoic section of the UNAM 5 core between 282 and 198 m below the present land surface, 7) the dolomite, subaerial exposure features (subaerial crusts, vugs, karst, dedolomite), and vug-filling cement from the Eocene formations are more abundant inside the Depression than inside the Basin. The depositional environments that are proposed for explaining the Cenozoic facies succession within the Santa Elena Depression are: 1) deeper marine water (Paleocene?-Early Eocene), 2) relatively isolated saline lake (Middle Eocene), and 3) shallow marine water (Middle-Late Eocene?). In places, the deeper-water facies are similar to those within the Chicxulub Sedimentary Basin. The shallow-water facies is similar to those occurring outside the Basin. In general, quartz and silicates are rare in the Cenozoic sedimentary carbonate of the northwestern Yucatan Peninsula. Therefore, their presence in the UNAM 5 core could be attributed to either impact breccia reworking or silicic volcanic processes. Quartz, chert, zeolite, and clay also are common in the suevite breccia of both Yax-1 and UNAM 5 cores. The fact that the Santa Elena Depression was a distinct sedimentary basin during much of the Paleogene could be explained by any or a combination of the following hypotheses: 1) In spite of being located outside the cenote ring, the Depression is a sub-basin of the larger and deeper Chicxulub Sedimentary Basin and is therefore located within the Chicxulub Impact Crater, 2) the Depression coincides with an impact crater distinct from the Chicxulub Impact Crater, 3) the Depression formed after the Chicxulub bolide impact due to slumping, crater wall failure, or larger-scale tectonic processes. The lack of conclusive evidence for multiple impact breccia layers in the northwestern Yucatan Peninsula, corroborated with the presence on top of the impact breccia from UNAM 5 core of deeper-water limestone similar to that of Late Paleocene-Early Eocene age from Yax-1 core, would be more consistent with either the first or third hypothesis.

  19. Summary of reported agriculture and irrigation water use in northwestern Arkansas counties, 1991

    USGS Publications Warehouse

    Holland, T.W.; Manning, C.A.; Stafford, K.L.

    1993-01-01

    This report summarizes the 1991 water-use reporting through the Conservation District Offices in the following northwestern Arkansas counties: Baxter, Benton, Boone, Carroll, Cleburne, Fulton, Izard, Madison, Marion, Newton, Searcy, Sharp, Stone, Van Buren, and Washington. The number of withdrawal registrations for northwestern Arkansas counties was 106 (16 groundwater and 90 surface water). Water withdrawals reported during the registration process total 41.72 Mgal/d (0.74 Mgal/d groundwater and 40.98 Mgal/d surface water) for agriculture and 3.33 Mgal/d (0.27 Mgal/d groundwater and 3.06 Mgal/d surface water) for irrigation. The registration reports for 1991 indicate that this water was applied to 3,588 acres of land to irrigate rice, soybeans, cash grains, hay, oats, vegetables, sod, berries, fruit trees, and timber as well as for the agricultural use of animal aquaculture.

  20. A statistical-dynamical model of the storm-wind climate of northwestern Europe

    NASA Astrophysics Data System (ADS)

    Keller, J. L.; Dailey, P. S.; Fischer, M. D.

    2003-04-01

    While earthquakes and tropical hurricanes often receive considerably more media attention, mid-latitude winter storms are the cause of a considerable amount of damage. Indeed, some of the costliest events in modern history (in terms of insured losses) have resulted from strong winds associated with winter storms over northwestern Europe. A "storm-wind climate" model for northwestern Europe has been developed as an integration of the NCAR-NCEP Global Reanalysis Project data set and the 5th generation NCAR - Penn State University mesoscale model (MM5). In its statistical-dynamical (or Monte Carlo based ensemble) implementation, this model produces realistic return-period wind profiles when compared with those expected from extreme event statistics. In this presentation the model-system's design and performance will be discussed, including its use with an impact (loss) model.

  1. Identification and molecular characterization of Theileria sp. infecting red deer ( Cervus elaphus ) in northwestern Poland

    Microsoft Academic Search

    Marek Sawczuk; Agnieszka Maciejewska; Bogumi?a Skotarczak

    2008-01-01

    Piroplasms from Theileria genus were detected in blood and spleen of red deer Cervus elaphus culled during the months of September 2004–January 2005 in northwestern Poland. The polymerase chain reaction revealed the\\u000a presence of Theileria deoxyribonucleic acid in 88% (36 of 41) of the animals examined. Molecular characterization of the parasites based on large\\u000a piece of 18S ribosomal ribonucleic acid

  2. Reef fish assemblages in north-western Sri Lanka: distribution patterns and influences of fishing practises

    Microsoft Academic Search

    Marcus C. Öhman; Arjan Rajasuriya; Emil Ólafsson

    1997-01-01

    The distribution and abundance of reef fishes in relation to habitat structure were studied within Bar Reef Marine Sanctuary (BRMS) and on an adjacent reef, disturbed by destructive fishing techniques, in north-western Sri Lanka, by visually censusing 135 species groups using fifty metre belt-transects. Two types of continental shelf patch-reefs are found in the study area: coral reefs and sandstone

  3. Austrocedrus chilensis and Nothofagus dombeyi stand development during secondary succession, in northwestern Patagonia, Argentina

    Microsoft Academic Search

    A. Dezzotti

    1996-01-01

    In northwestern Patagonia, Argentina, at low and mid elevations between 36°–43°S, the forests are composed of the xeric cypress Austrocedrus chilensis and the mesic southern beech Nothofagus dombeyi. The effects of the strong east-west environmental gradient, caused by the Andes' rain shadow and the changing topography, on the relative composition and dynamics of these evergreen temperate forests are striking, and

  4. The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA

    Microsoft Academic Search

    Heather L. Welch; Christopher T. Green; Richard H. Coupe

    Agricultural contamination of groundwater in northwestern Mississippi, USA, has not been studied extensively, and subsurface\\u000a fluxes of agricultural chemicals have been presumed minimal. To determine the factors controlling transport of nitrate-N into\\u000a the Mississippi River Valley alluvial aquifer, a study was conducted from 2006 to 2008 to estimate fluxes of water and solutes\\u000a for a site in the Bogue Phalia

  5. Late quaternary vegetational change in the Kotzebue sound area, northwestern Alaska

    Microsoft Academic Search

    P. Anderson

    1985-01-01

    Two sediment cores from Kaiyak and Squirrel lakes in northwestern Alaska yielded pollen records that date to ca. 39,000 and 27,000 yr B.P., respectively. Between 39,000 and 14,000 yr B.P., the vegetation around these lakes was dominated by Gramineae and Cyperaceae with some Salix and possibly Betula nana\\/glandulosa forming a local, shrub component of the vegetation. Betula pollen percentages increased

  6. HOME RANGE AND HABITAT USE BY THE LONG-EARED OWL IN NORTHWESTERN SWITZERLAND

    Microsoft Academic Search

    FABIENNE HENRIOUX

    The home ranges and hunting activities of 14 Long-eared Owls (Asio otus) were examined using radiotelemetry in an agricultural area of northwestern Switzerland from 1993-96 to determine the species' habitat requirements. Average home-range size was 980 ha and size was significantly cor- related with the amount of the range that was inhabited by humans (rs = 0.88, P  0.001).

  7. Effect of climatic change on snowmelt runoffs in mountainous regions of inland rivers in Northwestern China

    Microsoft Academic Search

    Jian Wang; Shuo Li

    2006-01-01

    Climatic change has significant impacts on snow cover in mid-latitude mountainous regions, in the meantime, spatial and temporal\\u000a changes of snow cover and snowmelt runoffs are considered as sensitive indicators for climatic change. In this study, the\\u000a upper Heihe Watershed in the Qilian Mountains was selected as a typical area affected by snow cover and snowmelt runoffs in\\u000a northwestern China.

  8. Rotational woodlot technology in northwestern Tanzania: Tree species and crop performance

    Microsoft Academic Search

    G. I. Nyadzi; R. M. Otsyina; F. M. Banzi; S. S. Bakengesa; B. M. Gama; L. Mbwambo; D. Asenga

    2003-01-01

    Growing of trees as woodlots on farms for five to seven years in rotation with crops was considered as a potential technology\\u000a to overcome the shortage of wood, which is a common problem to many parts of sub-Saharan Africa. The paper summarizes the\\u000a results of trials conducted at Tabora and Shinyanga in northwestern Tanzania on rotational woodlots, to evaluate tree

  9. Fluid inclusion study of Laogou and Xiaoyinuogaigou gold deposits in northwestern Erguna Metallogenic belt, NE China

    Microsoft Academic Search

    Guang Wu; Yanjing Chen; Fengyue Sun; Jun Liua

    Summary Gold deposits and occurrences, including the Shabaosi, Laogou and Xiaoyinuogaigou deposits, have been recently found in northwestern Erguna metallogenic belt along the southeastern margin of the Mongolia-Okhotsk Orogen, which is an important Au-Ag-Pb-Zn-Mo-polymetal belt in NE China. These gold deposits are strictly controlled by ductile shear zones. Orebodies are hosted in subsidiary fractures of these two ductile shear zones.

  10. Was the Coppermine Homocline of northwestern Canada uplifted as part of a Middle Proterozoic forebulge

    SciTech Connect

    Cook, F.A. (Univ. of Calgary, Alberta (Canada))

    1991-01-01

    Application of the principles of elastic plate bending to subsurface geometric information and outcrop in northwestern Canada suggests that Proterozoic crust was loaded and deflected during orogenic activity between about 1.6 and 1.1 Ga. Exposed Hudsonian (ca. 1.8-2.0 Ga) basement separating younger but coeval stratigraphic sequences in the Coppermine Homocline on the west and Bathurst Inlet on the east can be explained as a forebulge associated with the loading.

  11. Reconstruction of paleocoastlines for the northwestern South China Sea since the Last Glacial Maximum

    Microsoft Academic Search

    YanTao Yao; Jan Harff; Michael Meyer; WenHuan Zhan

    2009-01-01

    The range of relative sea level rise in the northwestern South China Sea since the Last Glacial Maximum was over 100 m. As\\u000a a result, lowland regions including the Northeast Vietnam coast, Beibu Gulf, and South China coast experienced an evolution\\u000a from land to sea. Based on the principle of reconstructing paleogeography and using recent digital elevation model, relative\\u000a sea

  12. Anthropogenic Pb in settling particulate matter in the Northwestern Pacific examined using stable isotopes of Pb

    Microsoft Academic Search

    Daisuke Nagaoka; Masahito Shigemitsu; Masao Minagawa; Shinichiro Noriki

    2010-01-01

    We have investigated Pb concentrations and isotopic compositions in settling particles collected by sediment traps experiments\\u000a over a period of two years, from May 2005 to April 2007, at two depths, 770 and 5100 m, at station KNOT in the Northwestern\\u000a Pacific Ocean (44°N, 155°E). To the identify provenances of Pb, the samples were separated into two fractions by chemical

  13. Risk assessment of hurricane winds for Eglin air force base in northwestern Florida, USA

    Microsoft Academic Search

    Kelsey N. Scheitlin; James B. Elsner; Shawn W. Lewers; Jill C. Malmstadt; Thomas H. Jagger

    Hurricane winds present a significant hazard for coastal infrastructure. An estimate of the local risk of extreme wind speeds\\u000a is made using a new method that combines historical hurricane records with a deterministic wind field model. The method is\\u000a applied to Santa Rosa Island located in the northwestern panhandle region of Florida, USA. Firstly, a hurricane track is created\\u000a for

  14. Water Scarcity and Water Use in Economic Systems in Zhangye City, Northwestern China

    Microsoft Academic Search

    Yong Wang; Hong-lang Xiao; Rui-fang Wang

    2009-01-01

    Water has traditionally been considered a physically scarce resource in Northwestern China, and most investigations of water\\u000a scarcity focus on the finite nature of water supplies. Based on the input–output analysis, this paper establishes a number\\u000a of indicators of water consumption to analyze the structural relationships between economic activities and their physical\\u000a relationships with the water resources. These indicators allow

  15. Late Holocene faulting and earthquake recurrence in the Reelfoot Lake area, northwestern Tennessee

    Microsoft Academic Search

    DAVID P. RUSS

    1979-01-01

    Faults, folds, and sand dikes have been identified in late Holocene sediments exposed in an exploratory trench excavated across Reelfoot scarp in northwestern Tennessee. In excess of 3 m of vertical displacement believed to be of deep-seated origin occurs across a 0.5-m-wide zone of east-dipping normal faults near the scarp base. The zone includes the only faults of probable tectonic

  16. Vertical distribution and temporal variation of dissolved organic carbon in the North-Western Mediterranean Sea

    Microsoft Academic Search

    G. Copinmontegut; BERNARD AVRIL

    1993-01-01

    During 1991 and 1992, detailed vertical profiles of dissolved organic carbon (DOC) content were obtained monthly, in the North-Western Mediterranean at the DYFAMED-1 site (43°25'N, 07°52'E). DOC was measured using a high temperature catalytic oxidation method. In the 150-2000 m layer, DOC distribution was quite uniform, with a content of about 0.6--0.7 mg C 1-1. In surface waters, DOC concentration

  17. Snow depth estimation over north-western Indian Himalaya using AMSR-E

    Microsoft Academic Search

    Indrani Das; R. N. Sarwade

    2008-01-01

    This paper presents the estimation of snow depth over north?western Indian Himalaya using the 18.7H and 36.5H GHz channels of Advanced Microwave Scanning Radiometer?EOS (AMSR?E). The Microwave Emission Model of Layered Snowpacks (MEMLS) was used along with AMSR?E to understand the difference in the snow pack emitted and sensor received signals due to the prevailing topography. The study shows that

  18. Habitat and reef-fish assemblages of banks in the Northwestern Hawaiian Islands

    Microsoft Academic Search

    Frank A. Parrish; Raymond C. Boland

    2004-01-01

    The moderately deep terraces and banks of the Northwestern Hawaiian Islands (NWHI) were surveyed to describe their habitat and reef-fish assemblages. These tracts of bottom at 30–40 m comprise more than 4,500 km 2of the region’s reef area. The habitat was found to be dominated by algal meadows (65% cover of exposed bottom), with infrequent relief features. Annual monitoring of select stations

  19. Arctic haze, mercury and the chemical composition of snow across northwestern Alaska

    Microsoft Academic Search

    Thomas A. Douglas; Matthew Sturm

    2004-01-01

    We sampled three layers of snow at 16 sites along a 1200km transect from Nome to Barrow across northwestern Alaska. Samples were analyzed for major element concentrations, specific conductance and pH. Samples from five of the sites were analyzed for trace element concentrations. Pb, Cd, SO42? and non-sea salt SO42? concentrations were significantly higher in layers deposited later in the

  20. Distribution and seasonal dynamics of arsenic in a shallow lake in northwestern New Jersey, USA

    Microsoft Academic Search

    Julia L. Barringer; Zoltan Szabo; Timothy P. Wilson; Jennifer L. Bonin; Todd Kratzer; Kimberly Cenno; Terri Romagna; Marzooq Alebus; Barbara Hirst

    2011-01-01

    Elevated concentrations of arsenic (As) occurred during warm months in water from the outlet of Lake Mohawk in northwestern\\u000a New Jersey. The shallow manmade lake is surrounded by residential development and used for recreation. Eutrophic conditions\\u000a are addressed by alum and copper sulfate applications and aerators operating in the summer. In September 2005, arsenite was\\u000a dominant in hypoxic to anoxic

  1. Seasonal abundance and diversity of ichthyoneuston in the northwestern Gulf of Mexico

    E-print Network

    Daher, Mary Ann

    1979-01-01

    ) emphasized tem- peratures as the main controlling factor. Kandler (1950, cited by Raymont, 1963) claimed that the time of spawning of some food fishes is directly related to temperature so that cold winters may cause a delay of one to two months. Russell... (1976) also reported delays in spawning and slower development of eggs caused by uncommonly cold, late winter temperatures, Few ichthyoplankton surveys have been conducted in the Gulf of Mexico, especially in the northwestern area of the Gulf. Arnold...

  2. Bedrock incision, rock uplift and threshold hillslopes in the northwestern Himalayas

    Microsoft Academic Search

    Douglas W. Burbank; John Leland; Eric Fielding; Robert S. Anderson; Nicholas Brozovic; Mary R. Reid; Christopher Duncan

    1996-01-01

    The topography of tectonically active mountain ranges reflects a poorly understood competition between bedrock uplift and erosion. Dating of abandoned river-cut surfaces in the northwestern Himalayas reveals that the Indus river incises through the bedrock at extremely high rates (2-12 mm yr-1). In the surrounding mountains, the average angles of hillslopes are steep and essentially independent of erosion rate, suggesting

  3. Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea

    Microsoft Academic Search

    J Peckmann; A Reimer; U Luth; C Luth; B. T Hansen; C Heinicke; J Hoefs; J Reitner

    2001-01-01

    Methane seeps in the northwestern Black Sea are accompanied by carbonate and pyrite precipitates. Sediments were sampled at locations on the Romanian (120m depth) and Ukrainian (180–200m depth) shelf and slope. Layered carbonate crusts are formed of (i) carbonate-cemented siliciclastic sediment containing dreissenoid bivalves, (ii) microcrystalline high-Mg-calcite or aragonite, and (iii) aragonitic cement. The Dreissena sediment is subrecent and was

  4. Reconstruction and climatic interpretation of a late Pleistocene peat deposit in northwestern Oregon

    Microsoft Academic Search

    GEORGE O. POINAR; ROBSON BONNICHSEN; CLIFFORD HEDLUND

    Summary 1 Climatic models predict that postglacial conditions in the Pacific Northwest of North America (between 11'000 and 10'000 years BP) were about 2-3 °C cooler than at present. These models were tested by examining plant macrofossils and insect remains in a late Pleistocene peat deposit in northwestern Oregon. 2 Stratigraphy in trenches (540 cm depth) revealed peat from 225

  5. Fish assemblage structure on a drowned barrier island in the northwestern Gulf of Mexico

    Microsoft Academic Search

    R. J. David Wells; J. O. Harper; J. R. Rooker; A. M. Landry Jr; T. M. Dellapenna

    2009-01-01

    We investigated the assemblage structure of fishes associated with different habitats (inshore mud, shell bank, and offshore\\u000a mud) over a drowned barrier island, Freeport Rocks Bathymetric High, on the inner continental shelf of the northwestern Gulf\\u000a of Mexico (NW Gulf). Density data from otter trawls were used to examine spatial (habitat and site) and temporal differences\\u000a in fish assemblage structure

  6. The flavonoid glycosides of Cornus canadensis L. and its allies in Northwestern North America

    Microsoft Academic Search

    J. F. Bain; K. E. Denford

    1979-01-01

    Summary The flavonoid glycoside profile ofCornus canadensis L. and its allies in Northwestern North America has been determined; quercetin 3-O-glucoside, 3-O-galactoside, 3-O-sophoroside and 3-O-gentiobioside; kaempferol 3-O-glucoside and 3-O-arabinoside. The discontinuity in distribution pattern of quercetin 3-O-gentiobioside within these taxa, associated with the phytogeography and historical factors affecting plant distribution in this area, indicates a possible polytopic and polychronistic origin of

  7. NEST-SITE CHARACTERISTICS OF HAMMOND'S AND PACIFIC SLOPE FLYCATCHERS IN NORTHWESTERN CALIFORNIA1

    Microsoft Academic Search

    HOWARD F. SAKAI; BARRY R. NOON

    Thirty nests of Hammond's (Empidonax hammondii) and 88 nests of Pacific- slope (E. difficilis) Flycatchers were located in different-aged Douglas-fir (Pseudotsuga men- ziesii)\\/tanoak (Lithocarpus densiflorus) dominated forests at 12 study sites in northwestern California during the breeding seasons of 1984, 1985, 1987, and 1988. In contrast to Pacific- slope Flycatchers, Hammond's used nest trees that averaged two to three times

  8. A probabilistic tsunami hazard assessment for the Makran subduction zone at the northwestern Indian Ocean

    Microsoft Academic Search

    Mohammad Heidarzadeh; Andrzej Kijko

    2011-01-01

    A probabilistic tsunami hazard assessment is performed for the Makran subduction zone (MSZ) at the northwestern Indian Ocean\\u000a employing a combination of probability evaluation of offshore earthquake occurrence and numerical modeling of resulting tsunamis.\\u000a In our method, we extend the Kijko and Sellevoll’s (1992) probabilistic analysis from earthquakes to tsunamis. The results suggest that the southern coasts of Iran and

  9. Geology and Geomorphology of Coral Reefs in the Northwestern Hawaiian Islands

    Microsoft Academic Search

    John J. Rooney; Pal Wessel; Ronald Hoeke; Jonathan Weiss; Jason Baker; Frank Parrish; Charles H. Fletcher; Joseph Chojnacki; Michael Garcia; Russell Brainard; Peter Vroom

    The Northwestern Hawaiian Islands (NWHI) comprise a portion of the middle of the 6,126 km long Hawaiian–Emperor seamount chain,\\u000a considered to be the longest mountain chain in the world Grigg (1983) (Fig. 13.1). Located in the middle of the North Pacific\\u000a Ocean, the Hawaiian Islands have been referred to as the most geographically isolated archipelago in the world. The islands

  10. Scanning electron microscopy of Pleistocene sands from Yamal and Taz peninsulas, Ob River Estuary, northwestern Siberia

    Microsoft Academic Search

    William C. Mahaney

    1998-01-01

    Coastal sediments in the Ob River Estuary of northwestern Siberia are considered to have either glacial and\\/or estuarine\\/alluvial origins. One school of thought argues for interconnected ice domes on the continental shelf that linked the Fenno-Scandinavian and Siberian ice (Grosswald Thesis). Another school of thought argues for an estuarine\\/alluvial origin (Danilov-Vtyermin thesis). The key to solving the problem of the

  11. An assessment of restoration success to forests planted for ecosystem restoration in loess plateau, Northwestern China

    Microsoft Academic Search

    Zhanbiao Yang; Hongxi Jin; Gang Wang

    2010-01-01

    Using ecosystem attributes identified by the Society of Ecological Restoration International, we assessed three restoration\\u000a projects in the loess plateau, northwestern China, including planting Larix principis-rupprechtii (LS) and Pinus tabulaeformis (PS) on shrubland, and planting L. principis-rupprechtii on open forest land (LO). The reestablishment of native species in LS and PS was poorer than LO because of the excessive\\u000a stand

  12. Changing climate—changing pathogens: Toxoplasma gondii in North-Western Europe

    Microsoft Academic Search

    Bastiaan G. Meerburg; Aize Kijlstra

    2009-01-01

    In this review, we describe the effects of global climate change for one specific pathogen: the parasite Toxoplasma gondii. It is postulated that an increase of T. gondii prevalence in humans can occur in some regions of North-Western Europe as a result of changing environmental conditions.\\u000a Such a change can be predicted by using Global Climate Change models. We have

  13. The northwestern Ethiopian Plateau flood basalts: Classification and spatial distribution of magma types

    Microsoft Academic Search

    Raphaël Pik; Catherine Deniel; Christian Coulon; Gezahegn Yirgu; Corine Hofmann; Dereje Ayalew

    1998-01-01

    The extensive, complex, continental flood basalt (CFB) province which occurs in Ethiopia and Yemen consists of Oligocene prerift volcanism related to the Africa–Arabia continental break-up. Basalts from the northwestern Ethiopian Plateau exhibit a particularly large range of compositions and, for the first time in the Afro-Arabian CFB province, low-Ti basalts have been encountered. Major and some trace element data have

  14. Arsenic associations in sediments from shallow aquifers of northwestern Hetao Basin, Inner Mongolia

    Microsoft Academic Search

    Yamin DengYanxin; Yanxin Wang; Teng Ma; Hui Yang; Jun He

    Understanding the mechanism of arsenic mobilization from sediments to groundwater is important for water quality management\\u000a in areas of endemic arsenic poisoning, such as the Hetao Basin in Inner Mongolia, northern China. Aquifer geochemistry was\\u000a characterized at three field sites (SH, HF, TYS) in Hangjinhouqi County of northwestern Hetao Basin. The results of bulk geochemistry\\u000a analysis of sediment samples indicated

  15. Occurrence of arsenic in core sediments and groundwater in the Chapai-Nawabganj District, northwestern Bangladesh

    Microsoft Academic Search

    A. H. M. Selim Reza; Jiin-Shuh Jean; Huai-Jen Yang; Ming-Kuo Lee; Brian Woodall; Chia-Chuan Liu; Jyh-Fu Lee; Shang-De Luo

    2010-01-01

    Groundwater and core sediments of two boreholes (to a depth of 50m) from the Chapai-Nawabganj area in northwestern Bangladesh were collected for arsenic concentration and geochemical analysis. Groundwater arsenic concentrations in the uppermost aquifer (10–40m of depth) range from 2.8?gL?1 to 462.3?gL?1. Groundwater geochemical conditions change from oxidized to successively more reduced, higher As concentration with depth. Higher sediment arsenic

  16. Organochlorine residues in great blue herons from the northwestern United States

    USGS Publications Warehouse

    Fitzner, R.E.; Blus, L.J.; Henny, C.J.; Carlile, D.W.

    1988-01-01

    We collected eggs or young Great Blue Herons from eight nesting colonies in the northwestern United States from 1977 through 1982. Subadults were collected at three estuarine areas in Puget Sound in 1981 and dead young or adults were collected at various localities. Nearly all samples analyzed contained organochlorine residues. There was no evidence that nay of the organochlorines detected were related to lethal or serious sublethal effects.

  17. Soil Formation

    NSDL National Science Digital Library

    Humans use soil for their daily needs but do not sufficiently take account of its slow formation and fast loss. Discover the amazing geology of soil formation and the basic rock and soil types.Although soil seems the end product from weathering rocks, it is merely a stage in the gigantic cycle of mineral recycling by the movement of tectonic plates.

  18. Regolith Formation

    NSDL National Science Digital Library

    NASA

    1997-01-01

    In this three-part activity, learners use food to determine the effects of wind, sandblasting and water on regolith (dust) formation and deposition on Earth. Then, learners simulate regolith formation on the Moon by meteorite bombardment, an activity best completed outdoors.

  19. Satellite observations of surface circulation in the northwestern Gulf of Mexico during March and April 1989

    NASA Astrophysics Data System (ADS)

    Barron, Charlie N.; Vastano, Andrew C.

    1994-05-01

    Six Argos-reported drifters drogued to a depth of 2.7 m produced eight trajectories over the Texas-Louisiana Shelf and the adjacent oceanic waters of the northwestern Gulf of Mexico from 7 March to 29 April 1989. Launched by United States Coast Guard aircraft and Texas A & M University's R.V. Gyre, the trajectories span the shelf from the vicinity of Barataria Bay, Louisiana to the southern reaches of Padre Island near Port Isabel, Texas. Two tracks demonstrate cross-slope and cross-shelf motion northward from the central western Gulf toward Louisiana. These two drifters join three others to define a coastal current flow westward from near the Mississippi delta to Galveston and then southwestward along the Texas coast. Two other trajectories indicate a relatively low-energy mid-shelf regime over the northwestern portion of the outer continental shelf. Five drifter groundings locate a convergence in the nearshore and littoral flows on the Texas coast between Matagorda Peninsula and southern Padre Island. Strong wind-driven events in the northwestern Gulf demonstrate instances of coherent shelf response over 7° of longitude and 3° of latitude. Infrared satellite imagery indicates the regional context and structure of the spatial scales of Gulf of Mexico surface circulation.

  20. Newly found submerged reefs on the Miyako-Sone platform, Ryukyu Arc, northwestern Pacific

    NASA Astrophysics Data System (ADS)

    Arai, K.; Matsuda, H.; Sasaki, K.; Machiyama, H.; Inoue, T.; Iryu, Y.

    2013-12-01

    Bathymetric mapping and observations of the seafloor using a remotely operated vehicle were carried out on the top of the Miyako-Sone submarine platform, northeast of Miyako-jima, Ryukyu Islands, northwestern Pacific. The high-resolution bathymetric map provides a detailed geomorphology and spatial distribution of submerged reefs and terraces on the platform. Our observations show that a submerged reef occurs at a water depth of ca. 55 m as a barrier reef that are up to 500 m across (from east to west) and 1,000 m lonng (from north to south) with a prominent ridge structure (reef crest). The submerged reef deepens westward from the crest along which spurs and grooves are well developed. A shallow lagoon extends on the east of the crest. Submersible observations confirm that the submerged reef now serves a hard substrate on which soft corals and algae grow. Terraces form at a water depth of ca. 110 m around a submerged reef on the northwestern Miyako-Sone platform. Submersible observations show the terrace surface is extensivbely covered with modern rhodoliths and living larger benthic foraminifers. Well-preserved coral-reef topography likely indicates limited sediment transportion from Miyako-jima and Okinwa-jima islands to the Miyako-Sone submarine platform. We plan to provide chronological constraint by direct sampling from the submerged reef and terraces, which enable to delineate a global deglacial sea-level history especially during early deglacial times in the northwestern Pacific.

  1. Early Evidence of Acheulean Settlement in Northwestern Europe - La Noira Site, a 700 000 Year-Old Occupation in the Center of France

    PubMed Central

    Moncel, Marie-Hélène; Despriée, Jackie; Voinchet, Pierre; Tissoux, Hélène; Moreno, Davinia; Bahain, Jean-Jacques; Courcimault, Gilles; Falguères, Christophe

    2013-01-01

    The human settlement of Europe during Pleistocene times was sporadic and several stages have been recognized, both from paleaoanthropological and archaeological records. If the first phase of hominin occupation (as early as 1.4 Ma) seems mainly restricted to the southern part of the continent, the second phase, characterized by specific lithic tools (handaxes), is linked to Acheulean settlements and to the emergence of Homo heidelbergensis, the ancestor of Neanderthals. This phase reached northwestern Europe and is documented in numerous sites in Germany, Great Britain and northern France, generally after 600 ka. At la Noira (Brinay, Central France), the Middle Pleistocene alluvial formation of the Cher River covers an archaeological level associated with a slope deposit (diamicton). The lithic assemblage from this level includes Large Cutting Tools (LCTs), flakes and cores, associated with numerous millstone slabs. The lithic series is classified as Acheulean on the basis of both technological and typological analyses. Cryoturbation features indicate that the slope deposits and associated archaeological level were strongly frozen and disturbed after hominin occupation and before fluvial deposition. Eight sediment samples were dated by the electron spin resonance (ESR) method and the weighted average age obtained for the fluvial sands overlying the slope deposits is 665±55 ka. This age is older than previous chronological data placing the first European Acheulean assemblages north of 45th parallel north at around 500 ka and modifies our current vision of the initial peopling of northern Europe. Acheulean settlements are older than previously assumed and the oldest evidences are not only located in southern Europe. La Noira is the oldest evidence of Acheulean presence in north-western Europe and attests to the possibility of pioneering phases of Acheulean settlement which would have taken place on a Mode 1-type substratum as early as 700 ka. The lithic assemblage from la Noira thus provides behavioral and technological data on early Acheulean occupation in Europe and contributes to our understanding of the diffusion of this tradition. PMID:24278105

  2. Early evidence of Acheulean settlement in northwestern Europe--la Noira site, a 700,000 year-old occupation in the center of France.

    PubMed

    Moncel, Marie-Hélène; Despriée, Jackie; Voinchet, Pierre; Tissoux, Hélène; Moreno, Davinia; Bahain, Jean-Jacques; Courcimault, Gilles; Falguères, Christophe

    2013-01-01

    The human settlement of Europe during Pleistocene times was sporadic and several stages have been recognized, both from paleaoanthropological and archaeological records. If the first phase of hominin occupation (as early as 1.4 Ma) seems mainly restricted to the southern part of the continent, the second phase, characterized by specific lithic tools (handaxes), is linked to Acheulean settlements and to the emergence of Homo heidelbergensis, the ancestor of Neanderthals. This phase reached northwestern Europe and is documented in numerous sites in Germany, Great Britain and northern France, generally after 600 ka. At la Noira (Brinay, Central France), the Middle Pleistocene alluvial formation of the Cher River covers an archaeological level associated with a slope deposit (diamicton). The lithic assemblage from this level includes Large Cutting Tools (LCTs), flakes and cores, associated with numerous millstone slabs. The lithic series is classified as Acheulean on the basis of both technological and typological analyses. Cryoturbation features indicate that the slope deposits and associated archaeological level were strongly frozen and disturbed after hominin occupation and before fluvial deposition. Eight sediment samples were dated by the electron spin resonance (ESR) method and the weighted average age obtained for the fluvial sands overlying the slope deposits is 665±55 ka. This age is older than previous chronological data placing the first European Acheulean assemblages north of 45(th) parallel north at around 500 ka and modifies our current vision of the initial peopling of northern Europe. Acheulean settlements are older than previously assumed and the oldest evidences are not only located in southern Europe. La Noira is the oldest evidence of Acheulean presence in north-western Europe and attests to the possibility of pioneering phases of Acheulean settlement which would have taken place on a Mode 1-type substratum as early as 700 ka. The lithic assemblage from la Noira thus provides behavioral and technological data on early Acheulean occupation in Europe and contributes to our understanding of the diffusion of this tradition. PMID:24278105

  3. Analysis of flash flood regimes in the North-Western and South-Eastern Mediterranean regions

    NASA Astrophysics Data System (ADS)

    Tarolli, P.; Borga, M.; Morin, E.; Delrieu, G.

    2012-05-01

    This work analyses the prominent characteristics of flash flood regimes in two Mediterranean areas: the North-Western Mediterranean region, which includes Catalonia, France and Northern Italy, and the South-Eastern Mediterranean region, which includes Israel. The two regions are characterized by similarities in the hydro-meteorological monitoring infrastructure, which permits us to ensure homogeneity in the data collection procedures. The analysis is articulated into two parts. The first part is based on use of flood peak data, catchment area and occurrence date for 99 events (69 from the North-Western region and 30 from the South-Eastern region). Analysis is carried out in terms of relationship of flood peaks with catchment area and seasonality. Results show that the envelope curve for the South-Eastern region exhibits a more pronounced decreasing with catchment size with respect to the curve of the North-Western region. The differences between the two relationships reflect changes in the effects of storm coverage and hydrological characteristics between the two regions. Seasonality analysis shows that the events in the North-Western region tend to occur between August and November, whereas those in the South-Eastern area tend to occur in the period between October and May, reflecting the relevant patterns in the synoptic conditions leading to the intense precipitation events. In the second part, the focus is on the rainfall-runoff relationships for 13 selected major flash flood events (8 from the North-Western area and 5 from the South-Eastern area) for which rainfall and runoff properties are available. These flash floods are characterised in terms of climatic features of the impacted catchments, duration and amount of the generating rainfall, and runoff ratio. Results show that the rainfall duration is shorter and the rainfall depth lower in the South-Eastern region. The runoff ratios are rather low in both regions, whereas they are more variable in the South-Eastern area. No clear relationship between runoff ratio and rainfall depth is observed in the sample of floods, showing the major influence of rainfall intensity and the initial wetness condition in the runoff generation for these events.

  4. Cenozoic tectonic evolution of the basin and range province in northwestern Nevada

    USGS Publications Warehouse

    Colgan, J.P.; Dumitru, T.A.; Reiners, P.W.; Wooden, J.L.; Miller, E.L.

    2006-01-01

    A regional synthesis of new and existing geologic and thermochronologic data document late Cretaceous - early Cenozoic regional erosion, Oligocene - Miocene volcanism, and subsequent late Miocene extension of the Basin and Range Province in northwestern Nevada and northeastern California. Across an ???220-km-wide region between the Santa Rosa and Warner Ranges, conformable sequences of 35 to 15 Ma volcanic rocks are cut by only a single generation of high-angle normal faults that accommodated ???23 km of total east-west extension (???12%). Fission-track, (U-Th)/He, geologic, and structural data from the Pine Forest Range show that faulting there began at 11 to 12 Ma, progressed at a relatively constant rate until at least 3 Ma, and has continued until near the present time. Extension in the Santa Rosa Range to the east took place during the same interval, although the post-6 Ma part of this history is less well constrained. Less complete constraints from adjacent ranges permit a similar timing for faulting, and we infer that extensional faulting in northwestern Nevada began everywhere at 12 Ma and has continued up to the present. Faulting in the Warner Range in northeastern California can only be constrained to have begun between 14 and 3 Ma, but may represent westward migration of Basin and Range extension during the Pliocene. Compared to the many parts of the Basin and Range in central and southern Nevada, extension in northwestern Nevada began more recently, is of lesser total magnitude, and was accommodated entirely by high-angle normal faults. Fission-track data document Late Cretaceous unroofing of Cretaceous (115 - 100 Ma) granitic basement rocks in northwestern Nevada, followed by a long period of relative tectonic quiescence that persisted through Oligocene and Miocene volcanism until the onset of Basin and Range extension at ???12 Ma. The low magnitude of extension (12%) and early Tertiary stability suggest that the modern ???31 km thick crust in northwestern Nevada was only slightly thicker (???35 km) prior to extension at 12 Ma, and was no thicker than ???38 km in the Late Cretaceous. This stands in contrast to other parts of the Basin and Range, where the crust was thickened to at least 45 to 50 km by Cretaceous thrusting and subsequently thinned to ???30 km by large magnitude (>50%) extension.

  5. Plasmapause formation

    NASA Astrophysics Data System (ADS)

    Lemaire, J.

    The theory of plasmapause formation is examined. Particular attention is given to the role of magnetospheric fields in the inner magnetosphere, the noon-midnight and dawn-dusk asymmetries, plasma density distribution in the plasmasphere, plasmapause positions in the nightside sector and the daytime LT sector, the LT distribution of detached plasma elements, the growth rate of interchange instability, the formation of new density knees at each new enhancement in magnetospheric convection, and diagmagnetic and finite-temperature effects. The ideal MHD theory for the formation of the plasmapause is considered.

  6. Correlation of the Jurassic-Cretaceous siliceous-volcanogenic sediments in northwestern surroundings of the Pacific (Koryak Upland)

    NASA Astrophysics Data System (ADS)

    Vishnevskaya, V. S.; Filatova, N. I.

    2008-12-01

    In distribution areas of the Pekul’neiveem and Chirynai formations customary distinguishable in the Koryak Upland, complicated tectonostratigraphic units are composed of alternating thrust sheets of different lithologic composition and age, which are juxtaposed because of widespread thrust faulting, as is proved by the radiolarian analysis. Nineteen radiolarian assemblages of different age are first established here in the Lower Jurassic-Hauterivian succession of siliceous-volcanogenic sediments. In the Lower Jurassic interval, the lower and upper Hettangian, lower and upper Sinemurian, and Pliensbachian beds are recognized. Paleontological characterization is also presented for the Aalenian (or Toarcian?-Aalenian), upper Bajocian, lower and upper Bathonian, and Callovian beds of the Middle Jurassic. Within the Upper Jurassic, the Oxfordian-early Kimmeridgian, late Kimmeridgian-early Tithonian, Tithonian, and late Tithonian-early Berriasian radiolarian assemblages are distinguished. The late Berriasian-early Valanginian, middle-late Valanginian, and Hauterivian radiolarian assemblages are first recognized or compositionally revised. Radiolarians and lithofacies data are used to correlate the tectonostratigraphic units and individualize the jasper-alkali basaltic (lower Hettangian), chert-terrigenous (Hettangian-Sinemurian), jasper-cherty (Pliensbachian-Aalenian), jasper (Bajocian-Hauterivian), jasper-basaltic (upper Bajocian-Valanginian), Fe-Ti basaltic (upper Bajocian-Bathonian), tuffitejasper-basaltic (Bathonian-Hauterivian), and terrigenous-volcanogenic (Bajocian-Valanginian) sequences. The correlation results are extrapolated into other continental areas flanking the Pacific, i.e., to the western Kamchatka, northern and northwestern coastal areas of the Sea of Okhotsk, where the analogous radiolarian assemblages are characteristic of comparable allochthonous units of terrigenous-siliceous-volcanogenic sediments.

  7. Morphologic Map of Glacial and Periglacial Features in the Northwestern Argyre Basin, Mars

    NASA Astrophysics Data System (ADS)

    Raack, Jan; Hiesinger, Harald; Reiss, Dennis

    2010-05-01

    Previous studies of morphologic features in the Argyre Basin suggested that they could have been formed by glacial processes [1,2,3]. Possible evidence for a past glaciation of the Argyre basin include landforms interpreted as e.g., eskers, drumlins, moraines and kettles [1]. Glacial features like lineated grooves, streamlined hills, U-shaped valleys and semicircular embayments (possible cirques) are consistent with extensive glacial modifications in the Argyre Basin [3]. For our study we chose a mountainous terrain in the northwestern part of Argyre basin (44°S - 48.5°S and 323.5°E - 329°E) to reinvestigate the glacial inventory and the history and evolution of glacial landforms and processes in this region with new, higher resolution image data. We produced a detailed morphologic map with 13 morphologic units based on High Resolution Stereo Camera (HRSC), Context Camera (CTX) and High Resolution Imaging Science Experiment (HiRISE) imagery. Large areas of the study region are covered with dissected and intact mantle material units. The smooth and flat mantle interpreted to be a dust/ice mantle [4] occurs in protected depressions or on southern, pole-facing slopes, which receive less insolation. Glacial/periglacial features (glaciers and viscous flow features) and fluvial features (gullies) are directly related to the dust/ice layer. Gullies are the most common fluvial features in the mapped area. They occur in areas where the mantle appears to be thick. The most obvious characteristics of the gullies are that they only erode into the dust/ice mantle and not the underlying bedrock, indicating a formation by melting of the water-ice-rich mantle [5]. The preferred orientation of the gullies is on poleward-facing slopes, where the dust/ice mantle is thickest. Often the gullies occur in conjunction with viscous flow features. Stratigraphically the gullies are one of the youngest landforms in the study region. Viscous flow features mostly occur between gullies and on dissected mantle material [6]. Often gully debris fans are superposed on this material. Other locations covered with viscous flow features include dust/ice mantle filled craters, where sediments in inclined craters have been deformed. A well-preserved glacier-like flow feature is located in the northernmost part of the mapping region. It shows well developed flow features (striae), which indicate an east to west flow direction with an average gradient of ~1,9°. The glacier is located in a protected area, almost completely surrounded by high mountains. Other possible glacial landforms such as pingo-like forms and polygonal terrains also occur on the dissected mantle material. Recent studies with HiRISE-data indicate a sequence from glaciation to ablation and perhaps subsequent periglacial processes [3]. We have investigated the relative stratigraphy of the morphologic units in our study region: (1) Glacial morphologies (viscous and glacier-like flow features) are superposed on mantle materials; (2) Morphologies formed by fluvial and periglacial processes (gullies, polygonal terrains, pingo-like forms), superpose or originate from glacial morphologies or mantle materials (dust/ice mantle); (3) Aeolian morphologies (various kinds of dunes, ripples) have a wide range of ages and overlie or were superposed by some periglacial morphologies. [1] Kargel, J. S. and Strom, R. G. (1992) Geology, 20, 3-7. [2] Hiesinger, H. and Head, J. W. (2002) PSS, 50, 939-981. [3] Banks, M. E. et al. (2008) JGR, 113, E12015, doi:10.1029/2007JE002994. [4] Mustard et al., (2001) Nature, 412, 411-414. [5] Christensen, P. R. (2003) Nature, 422, 45-47. [6] Milliken, R. E. et al. (2003) JGR, 108, doi:10.1029/ 2002JE002005.

  8. Bedout basement rise, offshore northwestern Australia: evidence of an unshocked mafic volcanic hyaloclastite volcanic breccia

    NASA Astrophysics Data System (ADS)

    Glikson, A.

    2004-12-01

    Core samples from Bedout-1 (3035.8-3044.95 m.), Bedout basement rise, offshore northwestern Australia, were examined by optical microscopy, SEM, EDS and WDS spectrometry. At this stratigraphic depth level Becker et al. (2004) interpret cryptocrystalline alteration zones around and within plagioclase in terms of shock-induced transformation of feldspar into diaplectic maskelynite glass _u postulating a ~200 km-large impact structure and thereby an impact connection of the Permian-Triassic boundary mass extinction. However, the breccia is dominated by fragments of microlitic basalt and ophitic-textured dolerite with well preserved igneous textures, showing no evidence of shock metamorphism. Euhedral pseudomorphs of chlorite and amphibole, probably after pyroxene, protrude into or are enveloped by euhedral albite-twinned calcic plagioclase (andesine to bytownite). Minor phases include euhedral ilmenite needles and subhedral magnetite grains. Plagioclase is altered by cryptocrystalline albite and microcrystalline albite-chlorite matrix along crystal boundaries, along twin lamella and within internal oscillatory crystal zones, consistent with burial metamorphosed hydrovolcanic basalts and spilites (e.g. Amstutz, 1974). The volcanic fragments are set within, and injected by, microcrystalline intergranular mesostasis of mixed mineral fragments and volcanic meta-glass. Becker et al. (2004) refer to the breccia in part as product of Mg-rich sediments (e.g. dolomites). However, apart from the pristine igneous textures of the breccia, the transition element levels (chlorite in dolerite fragment "C Ni 97-160 ppm; Co 75-152 ppm; Cu 69-204 ppm; mesostasis "C Ni 29-45 ppm; Co 18-52 ppm; Cu 26-110 ppm) are consistent with Fe-rich basalts but exceed common abundances in carbonates and marls (BVTP, 1981; Wedepohl, 1978). No shock metamorphic features, such as planar deformation features (PDF), are observed in the feldspar or in any other phases. No criteria for discriminating maskelynite and volcanic meta-glass are indicated by Becker et al. (2004). As PDF formation (10-35 GPa) necessarily precedes diaplectic transformation into maskelynite (35-45 GPa) (French, 1998), a presence of maskelynite is inconsistent with the absence of PDF in the plagioclase _u a phase prone to the development of shock effects (e.g. Mory, 2000). Little evidence exists for the hydrothermal activity which typically follows impact events. However, thanks to a partial development of a rim syncline-like structure in Triassic sediments around the Bedout rise, further testing of the origin of this remarkable structure is warranted. Amstutz, G.C., 1974, Spilites and Spilitic Rocks, Springer-Verlag, Berlin; Becker, L. et al., 2004, Science Express, 13.5.04; BVSP - Basaltic Volcanism Study Project, 1981, Pergamon; French, B.M., 1998, Traces of Catastrophe, Lunar and Planetary Contributions 954; Mory et al., 2000, Earth and Planetary Science, 177, 119-128; Wedepohl, K.H., Handbook of Geochemistry, Springer-Verlag, 1978.

  9. Costs of Nutrient Losses in Priceless Soils Eroded From the Highlands of Northwestern Ethiopia

    NASA Astrophysics Data System (ADS)

    Gebreselassie, Yihenew; Belay, Yihenew

    2014-05-01

    Soils formation is a geomorphic process that takes place through the interaction of soil forming factors in several hundreds and thousands of years. However, land degradation and soil erosion is consistently taking place in the horn of Africa washing away this priceless product in short period of time. The scale of the problem dramatically increased due to the increase in deforestation, overgrazing, over-cultivation, inappropriate farming practices, and increasing human population. Several research results were published in the region showing the extent of land degradation and soil loss. However, little attempt has been done to estimate the nutrient loss in monitory terms which made it difficult for policy makers to properly understand the extent of the problem. A study was, therefore, conducted in 2011 to estimate soil and nutrient losses caused by water erosion and predict nutrient replacement costs on different land use types and slope classes at Harfetay watershed, Northwestern Ethiopia. The revised soil loss equation (RUSLE) was used to estimate the soil loss from the different land uses and slope classes in watershed. Moreover, nutrient loss from similar units was calculated by multiplying the in situ nutrient concentration of soil samples by the estimated soil loss using RUSLE. The replacement costs of nutrient losses were calculated by multiplying the nutrient loss with the price of available nutrients in urea and diammonium phosphate. The estimate of the RUSLE indicated that the average soil losses in the study watershed were 119 tons ha-1 year-1 for non-conserved crop land, 23 tons for conserved farmlands, 23 tons for forest and shrub lands, 19 tons for grazing lands, and 6 tons for plantation forest. The mean soil loss for lower slope classes (<15%), middle slope classes (15-30%) and upper slope classes (>30%) were 30.11, 48.09 and 57.22 tons ha-1 year-1, respectively. The highest losses of total nitrogen (154.7 kg ha-1 year-1), available phosphorus (1.84 kg ha-1 year-1), and organic matter (1677.9 kg ha-1 year-1) were obtained from non-conserved cropland. Conversely, the lowest values of the same parameters were registered from the land covered with plantation forest. Comparing slope classes for non conserved cropland, organic matter and nutrient losses were higher in upper slope classes followed by middle and lower ones. The replacement cost of available N and available P for non-conserved cropland, conserved cropland, forest/shrub lands, grazing lands and plantations were 121, 36, 27, 32 and 13 Birr ha-1 year-1, respectively (1USD = 19 Birr); and the weighted mean replacement cost in the watershed was estimated to be 98 Birr ha-1 year-1 which is about 20% of the cost of fertilizer applied per individual farmers in the watershed. From the study it was possible to conclude that conversion of forest lands and plantation forests to cropland causes serious soil and nutrient losses. Construction of conservation structures on cropland, however, will reduce soil and nutrient losses. To halt soil and nutrient loss and ensure sustainable land management and agricultural development in the Harfetay watershed and similar watersheds, policy and development interventions including increasing awareness of farmers on of soil and nutrient losses, enforcing land use policies and expanding bio-physical soil conservation practices are required.

  10. Integrated exploration study of Norwegian-Danish basin, northwestern Europe

    SciTech Connect

    Joergensen, N.B.; Haselton, T.M.

    1987-05-01

    The Norwegian-Danish basin (NDB) extends from offshore Norway southeast through Denmark. This study, initiated by the Danish Energy Agency to evaluate hydrocarbon potential, consists of geophysical structural and stratigraphic mapping combined with geologic source rock and reservoir analysis. Approximately 25 wells and 15,000 km of seismic data were included. Formation of the NDB resulted from uplift of the Variscan foldbelt followed by subsidence of the foreland, i.e., the NDB and the North German basin. The Ringkoebing-Fyn High, a positive feature probably established in the late Precambrian and persisting to present, separates the basins, thus constituting the southern boundary of the NDB. Northeast the basin is bounded by the Fennoscandian shield and to the west by the North Sea graben system. Following deposition of Rotliegendes eolian and fluviatile sandstones, a major Late Permian marine transgression deposited up to 2000 m of evaporites and carbonates. Early Triassic regression resulted in thick red-bed deposits. Halokinesis commencing in the Upper Triassic dominated subsequent structural development. Continued subsidence led to deposition of Early Jurassic shelf mudstones overlain by deltaic sandstones. Rising seas during Late Cretaceous allowed widespread deposition of oceanic pelagic chalk. Early Paleocene wrench movements produced inversion. Basinal downwarping during the Tertiary was accompanied by progradation from the northeast. The complex tectonic history provides numerous different structural styles and a variety of depositional environments. To date only obvious structural features have been tested. This integrated basin study demonstrates that a number of other hydrocarbon plays remain to be explored.

  11. Late Pleistocene Vertebrates and Other Fossils from Epiguruk, Northwestern Alaska

    USGS Publications Warehouse

    Hamilton, T.D.; Ashley, G.M.; Reed, K.M.; Schweger, C.E.

    1993-01-01

    Sediments exposed at Epiguruk, a large cutbank on the Kobuk River about 170 km inland from Kotzebue Sound, record multiple episodes of glacial-age alluviation followed by interstadial downcutting and formation of paleosols. Vertebrate remains from Epiguruk include mammoth, bison, caribou, an equid, a canid, arctic ground squirrel, lemmings, and voles. Radiocarbon ages of bone validated by concordant ages of peat and wood span the interval between about 37,000 and 14,000 yr B.P. The late Pleistocene pollen record is dominated by Cyperaceae, with Artemisia, Salix, Betula, and Gramineae also generally abundant. The fossil record from Epiguruk indicates that the Kobuk River valley supported tundra vegetation with abundant riparian willows during middle and late Wisconsin time. Large herbivores were present during the height of late Wisconsin glaciation as well as during its waning stage and the preceding interstadial interval. The Kobuk River valley would have been a favorable refugium for plants, animals, and possibly humans throughout the last glaciation.

  12. Copper-silver deposits of the Revett Formation, Montana and Idaho: origin and resource potential

    USGS Publications Warehouse

    Frost, Thomas P.; Zientek, Michael L.

    2006-01-01

    The Revett Formation of northern Idaho and western Montana contains major stratabound copper-silver deposits near Troy, Rock Creek, and Rock Lake, Montana. To help the U.S. Forest Service (USFS) meet its goal of integrating geoscience information into the land-planning process, U.S. Geological Survey (USGS) scientists recently completed a compilation of regional stratigraphy and mineralogy of the Revett Formation and a mineral resource assessment of Revett-type copper-silver deposits. The USGS assessment indicates that a large area of USFS-administered land in northwestern Montana and northern Idaho may contain significant undiscovered Revett-type copper-silver deposits.

  13. Aquifers in the Sokoto basin, northwestern Nigeria, with a description of the general hydrogeology of the region

    USGS Publications Warehouse

    Anderson, H.R.; Ogilbee, William

    1973-01-01

    The Sokoto Basin of northwestern Nigeria lies in the sub-Saharan Sudan belt of west Africa in a zone of savannah-type vegetation. Rainfall, averaging about 30 inches annually in much of the basin, occurs chiefly in a wet season which lasts from May to October. A prolonged dry season extending from October to April is dominated by dusty harmattan winds from the northeast. April and May are the hottest months, when temperatures occasionally reach 105?F. Flow in streams of the Sokoto Basin is mostly overland runoff. Only in a few reaches, fed by ground-water discharge from the sedimentary rocks, are streams perennial. In the River Zamfara basin, ground-water discharge contributes almost 1 inch of the average 3.33 inches of total annual runoff. In the vicinity of Sokoto, the River Rima flows throughout the year sustained by spring discharge from perched ground water in limestone of the Kalambaina Formation. On the crystalline terrane where most of the streams rise, total annual runoff may exceed 5 inches, very little of which is ground-water discharge. The sedimentary rocks of the basin range in age from Cretaceous to Tertiary and are composed mostly of interbedded sand, clay, and some limestone; the beds dip gently toward the northwest. Alluvium of Quaternary age underlies the lowlands of the River Sokoto (now Sokoto) and its principal tributaries. These rocks contain three important artesian aquifers, in addition to regional unconfined ground-water bodies in all the principal outcron areas, and a perched water body in the outcrop of the Kalambaina Formation. Artesian aquifers occur at depth in the Gundumi Formation, the Rima Group, and the Gwandu Formation and are separated from one another by clay beds in the lower part of the Rima Group and the Dange Formation. In outcrop, clay in the Dange Formation also supports the perched water of the Kalambaina Formation. The Gundumi Formation, resting on the basement complex, is composed of varicolored clay, sand, and gravel and attains a thickness of 800 to 1,000 feet in its downdip extensions. Most of the formation is thin bedded and clayey and therefore does not yield large quantities of water to boreholes; the average yield is 2,700 gph (gallons per hour). (All gallons are imperial gallons.) Nevertheless, the upper part of the formation is sandy and more permeable and forms a regional artesian aquifer from which yields of as much as 6,600 gph are obtained from single boreholes. Clay in the lower part of the Rima Group confines the Gundumi aquifer downdip, so that at Rabah and Sokoto, for example, in the River Sokoto fadama (valley floor), artesian flow is found in boreholes screened in the Gundumi. Aquifer tests indicate low transmissivities, ranging from 300 to 5,000 gpd per ft (gallons per day per foot) in the lower part of the Gundumi Formation; but in the upper sandy zone the transmissivities are much higher, reaching 66,000 gpd per ft. In the western part of the Sokoto Basin, more productive aquifers with higher heads usually lie above the Gundumi aquifer so that it is not attractive for development, except in the River Sokoto fadama where artesian flow is possible. The Illo Group, which is in part contemporaneous with the Gundumi Formation, includes interbedded varicolored clay and grit in the southern part of the Sokoto Basin. The upper part of the Illo is known to be water-bearing; however, except for the test borehole at Mungadi, little is known of its subsurface extent and water-yielding potential. Overlying the Gundumi Formation in the central and northern part of the Sokoto Basin are interbedded fine gray sand and dark gray clay of the Wurno and Taloka Formations, separated in the extreme north by clay shale of the Dukamaje Formation. Collectively known as the Rima Group, these sediments attain a thickness of more than 1,000 feet near the Niger border. At depth and downdip the clayey beds practically disappear; the sandy beds become thicker and coar

  14. Galaxy formation

    NASA Technical Reports Server (NTRS)

    Silk, J.

    1984-01-01

    Implications of the isotropy of the cosmic microwave background on large and small angular scales for galaxy formation are reviewed. In primeval adiabatic fluctuations, a universe dominated by cold, weakly interacting nonbaryonic matter, e.g., the massive photino is postulated. A possible signature of photino annihilation in our galactic halo involves production of cosmic ray antiprotons. If the density is near its closure value, it is necessary to invoke a biasing mechanism for suppressing galaxy formation throughout most of the universe in order to reconcile the dark matter density with the lower astronomical determinations of the mean cosmological density. A mechanism utilizing the onset of primordial massive star formation to strip gaseous protogalaxies is described. Only the densest, early collapsing systems form luminous galaxies.

  15. IEMS 305 Statistical Methods for Quality Improvement Instructor: Prof. Daniel Apley; Rm. C150; 491-2397; apley@northwestern.edu; office

    E-print Network

    Hazen, Gordon

    in (if I am free) TA: Aaron Lucas, aaronlucas2012@u.northwestern.edu, TECH C230, 847-491-2318, Office available in C135. Enrollment in class should allow you access to the lab; if not, contact Johnathan Gaetz (arioch@iems.northwestern.edu). You can download a six-month academic rental of Minitab from http

  16. History of Northwestern University Feinberg School of Medicine 1 The first informal meeting for the school's establishment, held on March 12, 1859, included a number of

    E-print Network

    Chisholm, Rex L.

    History of Northwestern University Feinberg School of Medicine 1 The first informal meeting University Feinberg School of Medi- cine in 2002 in recognition of a $103 million donation from the Joseph and Bessie Feinberg Foundation. History of Northwestern University Feinberg School of Medicine #12;History

  17. As part of the mission of Northwestern University Feinberg School of Medicine to mentor and educate students to become inquiry-driven physicians, educators,

    E-print Network

    Chisholm, Rex L.

    As part of the mission of Northwestern University Feinberg School of Medicine to mentor and educateSC will be integrated into each phase of the new Feinberg curriculum, which began in the 2012/13 academic year. Course Descriptions Northwestern University Feinberg School of Medicine Area of Scholarly Concentration Program

  18. Program Director Master in Public Health Northwestern University # P-107N-14 The Institute for Public Health and Medicine (IPHAM) and the Department of Preventive Medicine at

    E-print Network

    Engman, David M.

    for Public Health and Medicine (IPHAM) and the Department of Preventive Medicine at Northwestern University functions, and is expected to have a primary academic appointment in the Department of Preventive MedicineProgram Director Master in Public Health ­ Northwestern University # P-107N-14 The Institute

  19. Differential population structuring and demographic history of two closely related fish species, Japanese sea bass ( Lateolabrax japonicus) and spotted sea bass ( Lateolabrax maculatus) in Northwestern Pacific

    Microsoft Academic Search

    Jin-Xian Liu; Tian-Xiang Gao; Koji Yokogawa; Ya-Ping Zhang

    2006-01-01

    The Quaternary cold periods in the Northwestern Pacific are thought to have heavily influenced the amount and distribution of intraspecific genetic variation in marine fishes. To estimate the demographic history and genetic structure of Lateolabrax maculatus and L. japonicus in the Northwestern Pacific, 256 individuals were sampled from 19 localities throughout the distribution range of the two species. Mitochondrial DNA

  20. Planet Formation

    NASA Astrophysics Data System (ADS)

    Chambers, J. E.

    The origin of the Sun's planetary system is a long-standing problem but one whose solution may be in sight. Recent progress has been rapid and much has changed since the first edition of this book. This article will describe a reasonably coherent story for the formation of the planets, based on what people know today, with the obvious caveat that future discoveries are bound to change some of the details. This article outlines the various aspects of planet formation according to the current paradigm, with a particular emphasis on the origin of the Sun's planetary system.

  1. Molecular sex identification of dry human teeth specimens from Sokoto, Northwestern Nigeria

    PubMed Central

    Zagga, AD; Ahmed, H. OON; Ismail, SM; Tadros, AA

    2014-01-01

    Background: The advent of molecular techniques has revolutionized the ability of scientists to estimate the sex of individuals. Forensic odontology plays an important role in establishing the sex of victims with bodies mutilated beyond recognition due to major disaster. The genetic difference between males and females is defined by the presence or absence of the Y-chromosome. The use of alphoid-repeat primers in sex estimation was first applied on dried blood. Generally, the X, Y alphoid repeats blind test attest to the accuracy of genetic testing, and also point the potential for occasional error in morphometric sexing. Aim: To estimate genetic sex of dry human teeth specimens from Sokoto, Northwestern Nigeria, using polymerase chain reaction (PCR). Materials and Methods: A single-blind study of DNA analysis for sex estimation of nine dry human teeth specimens from Sokoto, Northwestern Nigeria, through PCR, using alphoid repeats primers, was undertaken. Results: The genetic sex of each group of the teeth samples were accurately (100%) identified. For each group of teeth, PCR Sensitivity = 100%, Specificity = 0%, Predictive value of positive test = 100%, Predictive value of negative test = 0%, False positive rate = 0%, False negative rate = 0%, Efficiency of test = 100%. Fisher's exact probability test P = 1. Z-test: z- and P values were invalid. Conclusion: This study has demonstrated the successful use of alphoid-repeat primers in genetic sex identification of human dry teeth samples from Sokoto, Northwestern Nigeria. This is the first known study estimating the sex of human dry teeth specimens by means of PCR in Nigeria. There is need for further studies in Nigeria to complement the findings of this study. PMID:25125922

  2. Climate change increases deoxynivalenol contamination of wheat in north-western Europe.

    PubMed

    van der Fels-Klerx, H J; Olesen, J E; Madsen, M S; Goedhart, P W

    2012-01-01

    Climate change will affect the development of cereal crops and the occurrence of mycotoxins in these crops, but so far little research has been done on quantifying the expected effects. The aim of this study was to assess climate change impacts on the occurrence of deoxynivalenol in wheat grown in north-western Europe by 2040, considering the combined effects of shifts in wheat phenology and climate. The study used climate model data for the future period of 2031-2050 relative to the baseline period of 1975-1994. A weather generator was used for generating synthetic series of daily weather data for both the baseline and the future periods. Available models for wheat phenology and prediction of deoxynivalenol concentrations in north-western Europe were used. Both models were run for winter wheat and spring wheat, separately. The results showed that both flowering and full maturation of wheat will be earlier in the season because of climate change effects, about 1 to 2 weeks. Deoxynivalenol contamination was found to increase in most of the study region, with an increase of the original concentrations by up to 3 times. The study results may inform governmental and industrial risk managers to underpin decision-making and planning processes in north-western Europe. On the local level, deoxynivalenol contamination should be closely monitored to pick out wheat batches with excess levels at the right time. Using predictive models on a more local scale could be helpful to assist other monitoring measures to safeguard food safety in the wheat supply chain. PMID:22742589

  3. Significance of the fine drainage pattern for submarine canyon evolution: The Foix Canyon System, Northwestern Mediterranean Sea

    NASA Astrophysics Data System (ADS)

    Tubau, Xavier; Lastras, Galderic; Canals, Miquel; Micallef, Aaron; Amblas, David

    2013-02-01

    Submarine gullies are relatively small valleys that occur in a variety of submarine slopes. They are very common in continental slopes and in submarine canyon heads and flanks, where they often form tributary networks. Gullies are smaller than submarine canyons, though there is no standardised size criterion to distinguish between them. Gullies and gully networks have been often viewed as initial steps in the development of larger submarine canyons and more mature drainage networks. The shelf-incising submarine Foix Canyon System (FCS) is located in the northwestern Mediterranean Sea. Numerous, well-developed and morphologically diverse gullies carve its two heads and flanks. The objective of this study is to analyse the drainage network of the FCS and decipher the role of gullies in its evolution. Submarine gully and canyon networks were extracted from swath bathymetry data of 50 m grid size using Geographic Information Systems (GIS). A systematic morphometric analysis was carried out on drainage network of the FCS by using the Horton-Strahler method. Our results show that the FCS is formed by 1660 streams, 1000 km in total length, which can be classified to six stream orders. To detect relevant morphological changes along valley sections, the drainage density, the stream frequency and the drainage area relief parameters were applied. Furthermore, a branching index (Ib) was developed to characterise the geometry of the submarine drainage network. In the canyon heads Ib values are ~ 1.7, which correspond to a dendritic network, whereas Ib in the canyon branches displays values of ~ 2.2 corresponding to a pinnate one. At a finer scale, we have identified two types of canyon flank gullies, namely "rim gullies" and "toe gullies": (1) rim gullies form large, dendritic networks that extend from the canyon thalweg up to the canyon rim, and (2) toe gullies form smaller pinnate networks restricted to the lower part of the canyon flanks. The formation and development of rim gullies are interpreted as the main process responsible for canyon head growth and across-flank transport of material from the continental shelf. Toe gullies, on the other hand, are the morphological expression of the rejuvenation of rim gullies and the canyon itself. Axial incision and toe gully formation are interpreted as the result of bottom-to-top erosive processes acting at different scales, in response to regional and local changes of the factors controlling the system, respectively. This study helps to identify a variety of gullies and the processes they result from and provides a morphometric methodology to characterise submarine drainage networks at fine resolution scales.

  4. Current vertical movement demonstrated by comparative levelling in Brittany (northwestern France)

    NASA Astrophysics Data System (ADS)

    Lenôtre, N.; Thierry, P.; Blanchin, R.; Brochard, G.

    1999-01-01

    The current vertical movement of the Earth's crust is demonstrated through comparative levelling. The two methods presented are complementary. First we constructed a profile along traverses in order to highlight localized features such as recurrent faulting or block tilting. Second we produced a map of relative current vertical movement rates and their error coefficients using a geostatistical kriging method. These methods were applied to Brittany (northwestern France) and revealed that (1) the ancient NW-SE Rance and Morlaix faults are presently reactivated, and (2) the west of the region is tilted with uplift which is interpreted as a lithospheric deformation.

  5. Carbon isotopic composition of deep carbon gases in an ombrogenous peatland, northwestern Ontario, Canada

    SciTech Connect

    Aravena, R. (Univ. of Waterloo, Ontario (Canada). Center for Groundwater Research and Wetlands Research Center); Warner, B.G. (Univ. of Waterloo, Ontario (Canada). Wetlands Research Center and Dept. of Geography); Charman, D.J. (Univ. of Plymouth, Devon (United Kingdom). Dept. of Geographical Sciences); Belyea, L.R. (Queen Mary and Westfield College, London (United Kingdom). School of Biological Sciences); Mathur, S.P. (Foxleigh Crescent, Kanata, Ontario (Canada)); Dinel, H. (Center for Land and Biological Resources Research, Agriculture Canada, Ontario (Canada))

    1993-01-01

    Radiocarbon dating and carbon isotope analyses of deep peat and gases in a small ombrogenous peatland in northwestern Ontario reveals the presence of old gases at depth that are 1000-2000 yr younger than the enclosing peat. The authors suggest that the most likely explanation to account for this age discrepancy is the downward movement by advection of younger dissolved organic carbon for use by fermentation and methanogens bacteria. This study identifies a potentially large supply of old carbon gases in peatlands that should be considered in global carbon models of the terrestrial biosphere.

  6. Microscale strain partitioning? Differential quartz crystallographic fabric development in Phyllite, Hindu Kush, Northwestern Pakistan

    NASA Astrophysics Data System (ADS)

    Larson, K. P.; Lamming, J. L.; Faisal, S.

    2014-12-01

    Spatially referenced quartz c axis fabrics demonstrate the preservation of multiple, distinct fabrics in a specimen collected from northwestern Pakistan. The overall fabric yielded by the specimen is dominated by a single population of quartz grains, while the fabric signatures of two other unique, spatially distinct populations are overwhelmed. It is these minor fabrics, however, that provide information on temperature of deformation (403 ± 50 °C), differential stress (8.6 + 2.6/-1.5 MPa to 15.0 +3.8/-2.5 MPa), strain rate (10-16 s-1 to 10-15 s-1), and strain partitioning recorded by the specimen.

  7. Caribou antlers as nest materials for golden eagles in northwestern Alaska

    USGS Publications Warehouse

    Ellis, D.H.; Bunn, R.L.

    1998-01-01

    There are few published records of antlers in golden eagle (Aquila chrysaetos) nests. This note reports extensive use of caribou (Rangifer tarandus) antlers in three golden eagle nests in the Cape Kruzenstern region of northwestern Alaska. The importance of antlers to this population of eagles can be explained at least in part by (1) the lack of suitable woody vegetation on the open tundra, (2) the similarity of antlers to sticks, and (3) the abundance of antlers, especially cow caribou antlers, in the region.

  8. Fukushima-derived radiocesium in the northwestern Pacific Ocean in February 2012.

    PubMed

    Kumamoto, Yuichiro; Murata, Akihiko; Kawano, Takeshi; Aoyama, Michio

    2013-11-01

    We measured radiocesium ((134)Cs and (137)Cs) in seawaters collected at stations in the northwestern Pacific Ocean in February 2012. Activity concentration of Fukushima-derived radiocesium was highest in the transition area between the subarctic and subtropical regions, which was due to the direct discharge. The direct discharged radiocesium was transported southwardly across the Kuroshio Extension along isopycnal mixing. More than 80% of the Fukushima-derived radiocesium at stations both in the transition area and subtropical region was derived from the direct discharge. PMID:23582498

  9. Crustaceans from antipatharians on banks of the northwestern Gulf of Mexico.

    PubMed

    Wicksten, Mary K; Nuttall, Marissa F; Hickerson, Emma L

    2014-01-01

    The stalked barnacle Oxynaspisgracilis, the chirostylid squat lobster Uroptychus sp., and the caridean shrimps Periclimenescf.antipathophilus and Pseudopontonidesprincipis have been collected at 68-124 m by a remotely operated vehicle (ROV) on banks in the northern Gulf of Mexico. These species inhabited six species of antipatharian hosts. Pseudopontonidesprincipis, Oxynaspisgracilis, and Uroptychus sp. were not confined to a single host species. Except for Oxynaspisgracilis, collected by ROV in 2004-2005, these species have not been reported previously in the northwestern Gulf of Mexico. PMID:25561830

  10. The choco block in the northwestern corner of South America: Structural, tectonostratigraphic, and paleogeographic implications

    NASA Astrophysics Data System (ADS)

    Duque-Caro, H.

    The Choco Block, located in the northwestern corner of South America, comprises the isthmus of Panama east of the Canal Zone and northwestern Colombia, including the westernmost flanks of the Cordillera Occidental above latitude 4°N. Three major structural and lithogenetic elements compose this terrain: the Dabeiba and Baudo Arches, the Atrato-Chucunaque Basins, and the Istmina Deformed Zone. The Dabeiba and Baudo Arches outline the external boundaries of the Choco Block and display similar characteristics: (a) mostly positive gravity anomalies and association of igneous bodies of oceanic origin with sedimentary suites, and (b) occurence of Upper Cretaceous to Miocene pelagic and hemipelagic and terrigenous strata in blocks of different ages and environments associated with mafic igneous rocks. The Dabeiba Arch exhibits a melange fabric, particularly at its eastern margin, in which disrupted strata and inclusions of Upper Cretaceous-Paleocene, Eocene-Oligocene, and Miocene exotic blocks are dispersed in a sheared pelitic matrix of middle Miocene age. The Atrato-Chucunaque Basins contain sedimentary fill exceeding 10 km in thickness. Two distinctive stratigraphic sequences comprise: (1) an outcropping and apparently continuous Oligocene to middle Miocene sequence composed mostly of pelagic and hemipelagic strata, overlain by hemipelagic and terrigenous strata of latest Middle Miocene to Pliocene age, and (2) an underlying middle Miocene and older sequence, composed mostly of turbidities, which has been recognized only in subsurface sections. An evaluation and synthesis of the structural and lithogenetic information of the Choco Block indicate the following conclusions. The Choco Block is an exotic terrane with no lithogenetic affinity with South America, accreted onto the northwestern flanks of the Cordillera Occidental during the middle Miocene. The occurence of exotic upper Paleocene planktic foraminiferal assemblages in the Dabeiba Arch suggests an origin for the Choco Block as distant as the northern latitudes of Guatemala and Mexico. The Uramita Fault Zone is the suture between the Choco Block and the Cordillera Occidental in NW South America. The young intermontane Atrato and Chucunaque Basins and the Istmina Deformed Zone were formed as a result of the accretion of the Choco Block to the northwestern flanks of the Cordillera Occidental during middle Miocene time.

  11. Florida coastal ecological characterization: a socioeconomic study of the northwestern region. Volume I. Text

    SciTech Connect

    French, C.O.; Parsons, J.W. (eds.)

    1983-08-01

    Data are compiled from existing sources on the social and economic characteristics of the Northwestern coastal region of Florida, which is made up of Escambia, Santa Rosa, Okaloosa, Walton, Bay, Gulf, and Franklin Counties. Described are the components and interrelationships among complex processes that include population and demographics characteristics, mineral production, multiple-use conflicts, recreation and tourism, agricultural production, sport and commercial fishing, transportation, industrial and residential development, and environmental issues and regulations. Energetics models of socioeconomic systems are also presented. 40 figures, 108 tables.

  12. Hydrologic data from Naval Oil Shale Reserves, Parachute Creek basin, northwestern Colorado, 1980-81

    USGS Publications Warehouse

    Galyean, K.C.; Adams, D.B.; Collins, D.L.

    1985-01-01

    Two years (water yr 1980 and 1981) of data collected by the U.S. Geological Survey for the U.S. Department of Energy, Naval Petroleum and Oil Shale Reserves, in the Parachute Creek drainage basin of northwestern Colorado are tabulated. Data were obtained from five surface water gages, two automatic sediment samplers, and two water quality monitors. Climate data include maximum, minimum, and average temperature and relative humidity, average wind speed and wind direction, and total daily solar radiation. Daily total precipitation is reported for three stations, and snow-course data reported for one site. (Author 's abstract)

  13. Crustaceans from antipatharians on banks of the northwestern Gulf of Mexico

    PubMed Central

    Wicksten, Mary K.; Nuttall, Marissa F.; Hickerson, Emma L.

    2014-01-01

    Abstract The stalked barnacle Oxynaspis gracilis, the chirostylid squat lobster Uroptychus sp., and the caridean shrimps Periclimenes cf. antipathophilus and Pseudopontonides principis have been collected at 68–124 m by a remotely operated vehicle (ROV) on banks in the northern Gulf of Mexico. These species inhabited six species of antipatharian hosts. Pseudopontonides principis, Oxynaspis gracilis, and Uroptychus sp. were not confined to a single host species. Except for Oxynaspis gracilis, collected by ROV in 2004–2005, these species have not been reported previously in the northwestern Gulf of Mexico. PMID:25561830

  14. Mycoflora of freshly harvested flint corn from Northwestern Provinces in Argentina.

    PubMed

    González, H H L; Resnik, S L; Pacin, A M

    2002-01-01

    A mycological survey was carried out for the first time, on red flint corn samples from the northwestern Andinian region of Argentina in the 1999 and 2000 harvest seasons. Species of the genus Fusarium were the most prevalent component of the flint corn mycoflora present in all provinces. F. verticillioides was the predominant Fusarium isolated in the 1999 harvest season in the the region, and was found at higher incidence level than those observed on commercial semident corn hybrids harvested in the main corn production area in Argentina (Pampean region). During the 2000 harvest season, Fusarium graminearum was most commonly isolated species in Salta province. PMID:12650597

  15. Uplift and Subsidence in the Northwestern German North Sea and their Impact on Sedimentation and Erosion of Mesozoic to Cenozoic sediments

    NASA Astrophysics Data System (ADS)

    Jaehne, Fabian; Arfai, Jashar; Lutz, Rüdiger

    2013-04-01

    Within the framework of the GPDN project (www.geopotenzial-nordsee.de) a detailed seismic mapping project focuses on the northwestern offshore part of the German North Sea sector, the so called 'Entenschnabel' area, which was not considered in former studies (Baldschuhn et al., 2001) of the German North Sea sector. The Northwestern German North Sea is characterized by a complex rift dominated structural pattern in the Mesozoic, with the Central Graben as the main structure, resulting from a multiphase tectonic evolution. Several phases of uplift and subsidence were driven by extensional and compressional tectonic events, as well as by volcanic activity at the North Sea Dome and by extensive mobilization of Zechstein salt. These different influences on the sedimentary and structural evolution and their changes over time are distinguishable by detailed mapping of several formations. Spatial distribution of these formations and their thickness variations reveal changes of depocenters and changes of internal geometry. In the Entenschnabel area, the Central Graben is the dominating structural element. First extensional pulses took place in the Lower Triassic followed by several phases of rifting from the Middle to Late Triassic. The age of rifting phases can be defined by thickening of syn-tectonic Triassic to Jurassic strata towards the major fault zones. During the Jurassic the main extensional phase took place in combination with extensive diapirism. Analyses of the distribution and the thicknesses of sediments in rim-synclines reveal that most of the salt structures inside the Central Graben had a main phase of growth during the Late Jurassic. The Jurassic to Cenozoic evolution of the Central Graben and surrounding areas is closely related to the evolution of the volcanic activity at the North Sea Rift Dome (Graversen, 2006). In most of the German North Sea a supra-regional uplift driven by this volcanic activity led to a major erosional event, which is defined by a major unconformity at the base of the Lower Cretaceous. In contrast the German part of the Central Graben is characterized by continuous sedimentation during this time. Another difference of the German Central Graben compared to the rest of the German North Sea is a structural inversion of parts of the graben during the Late Cretaceous. Greatest thicknesses of the Upper Cretaceous are reached on the eastern graben shoulder of the Central Graben along the Nordschillgrund High. The reason for subsidence along this long-living Triassic to Jurassic structural high has to be investigated. Baldschuhn, R., et al. (2001). Geotektonischer Atlas von Nordwestdeutschland und dem deutschen Nordsee-Sektor - Strukturen, Strukturentwicklung, Paläogeographie. Geologisches Jahrbuch, A 153: 3-95. Graversen, O. (2006). The Jurassic-Cretaceous North Sea Rift Dome and Associated Basin Evolution. Search and Discovery.

  16. Hydrodynamic potential of upper cretaceous Mesaverde group and Dakota formation, San Juan Basin, northwestern New Mexico and southwestern Colorado

    E-print Network

    Dougless, Thomas Clay

    1984-01-01

    on vertical, downward flow through thick sections of semi-permeable shales to explain hydrodynamic sinks with minimum isopotential contours of 3, 000 ft (915 R). Based on corrected pressures, this study has found that the gas accumulations in the basin... Corners area, the Dakota is all nonmarine and consists of 150 ft (46 m) of fluvial sandstone with carbonaceous paludal shale. There is about 350 ft (108 m) of stratigraphic rise to the base of the marine shale in transgressing the San Juan Basin (Owens...

  17. Stratigraphic cross section (G) of the Upper Devonian Perrysburg and Java Formations and their equivalents, Northwestern Pennsylvania

    SciTech Connect

    Harper, J.A.; Abel, K.D.

    1981-01-01

    The cross sections are of the Girard D92, Girard G129, Linesville B15, Linesville I59, Stoneboro D7, Mercer A4, Mercer G3, Zelienople A9, and Zelienople F10 locations in Erie, Crawford, Mercer, Lawrence, and Butler counties in Pennsylvania. (DLC)

  18. Soil, environmental, and watershed measurements in support of carbon cycling studies in northwestern Mississippi

    USGS Publications Warehouse

    Huntington, T.G.; Harden, J.W.; Dabney, S.M.; Marion, D.A.; Alonso, C.; Sharpe, J.M.; Fries, T.L.

    1998-01-01

    Measurements including soil respiration, soil moisture, soil temperature, and carbon export in suspended sediments from small watersheds were recorded at several field sites in northwestern Mississippi in support of hillslope process studies associated with the U.S. Geological Survey's Mississippi Basin Carbon Project (MBCP). These measurements were made to provide information about carbon cycling in agricultural and forest ecosystems to understand the potential role of erosion and deposition in the sequestration of soil organic carbon in upland soils. The question of whether soil erosion and burial constitutes an important net sink of atmospheric carbon dioxide is one hypothesis that the MBCP is evaluating to better understand carbon cycling and climate change. This report contains discussion of methods used and presents data for the period December 1996 through March 1998. Included in the report are ancillary data provided by the U.S. Department of Agriculture (USDA) ARS National Sedimentation Laboratory and U.S. Forest Service (USFS) Center for Bottomland Hardwoods Research on rainfall, runoff, sediment yield, forest biomass and grain yield. Together with the data collected by the USGS these data permit the construction of carbon budgets and the calibration of models of soil organic matter dynamics and sediment transport and deposition. The U.S. Geological Survey (USGS) has established cooperative agreements with the USDA and USFS to facilitate collaborative research at research sites in northwestern Mississippi.

  19. A Survey of Phytoparasitic Nematodes on Cultivated and Non-Cultivated Plants in Northwestern Egypt

    PubMed Central

    Ibrahim, I. K. A.; Handoo, Z. A.; El-Sherbiny, A. A.

    2000-01-01

    Surveys were conducted in Alexandria, El-Behera, and Matrouh Governorates in northwestern Egypt during the 1994-1998 cropping seasons to study the occurrence, population density, host associations, and distribution of phytoparasitic nematodes associated with 35 major crops, grasses, and weeds. A total of 220 soil and root samples containing mixed populations of 26 genera and 38 species of phytoparasitic nematodes was analyzed; three known genera and 13 known species are reported for the first time in northwestern Egypt. Root-knot nematodes with 34 occurrences were the most frequently encountered group of nematodes, followed by spiral, stunt, ring, lesion, lance, and dagger nematodes with 19, 18, 15, 9, 8, and 7 occurrences, respectively. New species records are Boleodorus pakistanensis, Criconemella sphaerocephala, Discocriconemella sphaerocephaloides, Hemicriconemoides cocophilus, Hemicycliophora thienmanni, Hoplolaimus clarissimus, Irantylenchus clavidorus, Merlinius nanus, Paratylenchus projectus, Tylenchorhynchus ebriensis, Tylenchus afghanicus, T. exiguus, Xiphinema basilgoodeyi, and X. ensiculiferum. Survey results showed new host plant records for most of the identified nematode species in Egypt. PMID:19270998

  20. Ecology of petroleum platforms in the northwestern Gulf of Mexico: a community profile

    SciTech Connect

    Gallaway, B.J.; Lewbel, G.S.

    1982-07-01

    This community profile of petroleum platforms describes the structure and ecological function of petroleum platforms in the northwestern Gulf of Mexico. The profile proceeds from an introductory section describing the history of platform installation, structural properties, and their distribution in the northwestern Gulf of Mexico, to characterizations of the composition and biology of some of the major faunal groups on or around the platforms, to descriptions of structural attributes of petroleum platform communities, to observations of successional patterns and growth of the communities, to discussions of the ecosystem dynamics of the communities in terms of trophic linkage and biomass and carbon flows. In each of these sections, the effects of discharges from the active structures on the communities are described. The effects of the petroleum platform community on the surrounding soft-bottom communities are implicitly described throughout the profile, and explicitly addressed under the section describing the ecosystem dynamics. We then briefly summarize some of the values of production platform communities to man, and, in the final section of the text make an appeal that specific steps be taken to preserve an endangered biological resource: production platform communities.

  1. Cryptic species and historical biogeography of eel gobies (Gobioidei: Odontamblyopus) along the northwestern Pacific coast.

    PubMed

    Tang, Weixing; Lshimatsu, Atsushi; Fu, Cuizhang; Yin, Wei; Li, Guo; Chen, Hui; Wu, Qianhong; Li, Bo

    2010-01-01

    Cryptic species are common in gobioid fishes, as revealed by recent molecular studies. This study collected molecular and morphological data to delimit species boundaries and to reveal the historical biogeography of Odontamblyopus lacepedii sensu lato by sampling 87 specimens from 16 locations in the northwestern Pacific. Phylogenetic trees based on mitochondrial NADH dehydrogenase subunit 5 sequences identified three major clades. Clear morphological separations among these clades were detected by examining morphological characters used in taxonomic diagnosis. Therefore, these clades were delineated as three separate species: O. lacepedii sensu stricto (in the East China Sea, Yellow Sea, Gulf of Bohai, and Ariake Bay); O. sp. (in the southern East China Sea and southern Yellow Sea); and O. rebecca (in the Gulf of Tonkin, northern South China Sea, and southern East China Sea). Estimated divergence times were 0.61 +/- 0.15 Ma between O. lacepedii and O. sp., and 2.31+/-0.36 Ma between O. rebecca and O. lacepedii+O. sp. These findings indicate that isolation of marginal seas and habitat fragmentation during major falls in sea level in the late Pliocene and Pleistocene may have been responsible for genetic breaks among Odontamblyopus species in the northwestern Pacific. PMID:20064002

  2. Mineral precipitation and dissolution at two slag-disposal sites in northwestern Indiana, USA

    USGS Publications Warehouse

    Bayless, E.R.; Schulz, M.S.

    2003-01-01

    Slag is a ubiquitous byproduct of the iron- and steel-refining industries. In northwestern Indiana and northeastern Illinois, slag has been deposited over more than 52 km2 of land surface. Despite the widespread use of slag for fill and construction purposes, little is known about its chemical effects on the environment. Two slagdisposal sites were examined in northwestern Indiana where slag was deposited over the native glacial deposits. At a third site, where slag was not present, background conditions were defined. Samples were collected from cores and drill cuttings and described with scanning electron microscopy and electron microprobe analysis. Ground-water samples were collected and used to assess thermodynamic equilibria between authigenic minerals and existing conditions. Differences in the mineralogy at background and slag-affected sites were apparent. Calcite, dolomite, gypsum, iron oxides, and clay minerals were abundant in native sediments immediately beneath the slag. Mineral features indicated that these minerals precipitated rapidly from slag drainage and co-precipitated minor amounts of non-calcium metals and trace elements. Quartz fragments immediately beneath the slag showed extensive pitting that was not apparent in sediments from the background site, indicating chemical weathering by the hyperalkaline slag drainage. The environmental impacts of slag-related mineral precipitation include disruption of natural ground-water flow patterns and bed-sediment armoring in adjacent surface-water systems. Dissolution of native quartz by the hyperalkaline drainage may cause instability in structures situated over slag fill or in roadways comprised of slag aggregates.

  3. Impacts of Surface Water Diversions for Marijuana Cultivation on Aquatic Habitat in Four Northwestern California Watersheds

    PubMed Central

    Cockrill, Adam; van Hattem, Michael; Miller, Linda; Tauzer, Margaret; Leppig, Gordon

    2015-01-01

    Marijuana (Cannabis sativa L.) cultivation has proliferated in northwestern California since at least the mid-1990s. The environmental impacts associated with marijuana cultivation appear substantial, yet have been difficult to quantify, in part because cultivation is clandestine and often occurs on private property. To evaluate the impacts of water diversions at a watershed scale, we interpreted high-resolution aerial imagery to estimate the number of marijuana plants being cultivated in four watersheds in northwestern California, USA. Low-altitude aircraft flights and search warrants executed with law enforcement at cultivation sites in the region helped to validate assumptions used in aerial imagery interpretation. We estimated the water demand of marijuana irrigation and the potential effects water diversions could have on stream flow in the study watersheds. Our results indicate that water demand for marijuana cultivation has the potential to divert substantial portions of streamflow in the study watersheds, with an estimated flow reduction of up to 23% of the annual seven-day low flow in the least impacted of the study watersheds. Estimates from the other study watersheds indicate that water demand for marijuana cultivation exceeds streamflow during the low-flow period. In the most impacted study watersheds, diminished streamflow is likely to have lethal or sub-lethal effects on state-and federally-listed salmon and steelhead trout and to cause further decline of sensitive amphibian species. PMID:25785849

  4. Fire cue effects on seed germination of six species of northwestern Patagonian grasslands

    NASA Astrophysics Data System (ADS)

    Gonzalez, S. L.; Ghermandi, L.

    2012-09-01

    Postfire recruitment of seedlings has been attributed to a stimulation of germination by fire-related cues. The germination response to heat shock (80 °C - 5 min), smoke (60 min), the combination of both factors and no heat no smoke (control) was studied in six native species (two dominant grasses, two dominant shrubs and two annual fugitive herbs) of northwestern Patagonian grasslands. Seeds of the grasses Festuca pallescens and Stipa speciosa and the shrub Senecio bracteolatus (Asteraceae) germinated when they were exposed to heat shock, whereas seeds of the other shrub, Mulinum spinosum (Apiaceae), were killed by this fire cue. In grasses, probably the glume of caryopsis protected embryos from heat. Possibly, the seed size could explain the different responses of the two shrubs. Heat combined with smoke reduced seed germination for S. speciosa and S. bracteolatus. The heat could have scarified seeds and the longer exposure to smoke could have been toxic for embryos. The same treatment increased germination of the annual fugitive herb Boopis gracilis (Calyceraceae). We concluded that fire differentially affects the seedling recruitment of the studied species in the northwestern Patagonian grasslands.

  5. Simulating the impacts of groundwater pumping on stream aquifer dynamics in semiarid northwestern Oklahoma, USA

    NASA Astrophysics Data System (ADS)

    Zume, Joseph; Tarhule, Aondover

    2008-06-01

    Visual MODFLOW, a numerical groundwater flow model, was used to evaluate the impacts of groundwater exploitation on streamflow depletion in the Alluvium and Terrace aquifer of the Beaver-North Canadian River (BNCR) in northwestern Oklahoma, USA. Water demand in semi-arid northwestern Oklahoma is projected to increase by 53% during the next five decades, driven primarily by irrigation, public water supply, and agricultural demand. Using MODFLOW’s streamflow routing package, pumping-induced changes in baseflow and stream leakage were analyzed to estimate streamflow depletion in the BNCR system. Simulation results indicate groundwater pumping has reduced baseflow to streams by approximately 29% and has also increased stream leakage into the aquifer by 18% for a net streamflow loss of 47%. The magnitude and intensity of streamflow depletion, however, varies for different stream segments, ranging from 0 to 20,804 m3/d. The method provides a framework for isolating and quantifying impacts of aquifer pumping on stream function in semiarid alluvial environments.

  6. Distribution of trace elements in the Mississippi River plume and the Northwestern Gulf of Mexico

    SciTech Connect

    Means, J.C.; McMillin, D.J.; Reily, L.A. [Louisiana State Univ., Baton Rouge, LA (United States)

    1994-12-31

    The fate of 55 trace and rare earth elements in the Mississippi River plume and coastal waters of the Northwestern Gulf of Mexico is being investigated as part of a large-scale physical oceanographic study. Trace element speciation and transport in (2O L) seawater samples are being investigated in a three-phase model in which samples are separated into a particulate (>400 nm), colloidal (1--400 nm) and dissolved phases (<1 nm) prior to elemental analysis by ICP/MS. Data were obtained on four discrete cruises in 1992--93. Detection limits were 0.1 ng/ml for the dissolved and colloidal phases and {approximately} 1 ng/g for suspended particulates and bedded sediment samples. All analysis data were corrected for blanks and isotopic interferences. All elements were detected in all samples at trace levels or above. Riverine inputs from the Mississippi and Atchafalaya Rivers were identified in coastal waters. Inputs from the Calcasieu, Sabine and Galveston Rivers were also detected. Suspended particulate concentrations were highly correlated with surficial bedded sediment concentrations. Element ratioing techniques demonstrated that several elements were preferentially bound to colloidal phase fraction. Dilution of dissolved phase riverine sources using salinity data yielded good correlations. Estimates of the flux of each element are presented in a simple box model of the northwestern Gulf waters.

  7. Impacts of surface water diversions for marijuana cultivation on aquatic habitat in four northwestern california watersheds.

    PubMed

    Bauer, Scott; Olson, Jennifer; Cockrill, Adam; van Hattem, Michael; Miller, Linda; Tauzer, Margaret; Leppig, Gordon

    2015-01-01

    Marijuana (Cannabis sativa L.) cultivation has proliferated in northwestern California since at least the mid-1990s. The environmental impacts associated with marijuana cultivation appear substantial, yet have been difficult to quantify, in part because cultivation is clandestine and often occurs on private property. To evaluate the impacts of water diversions at a watershed scale, we interpreted high-resolution aerial imagery to estimate the number of marijuana plants being cultivated in four watersheds in northwestern California, USA. Low-altitude aircraft flights and search warrants executed with law enforcement at cultivation sites in the region helped to validate assumptions used in aerial imagery interpretation. We estimated the water demand of marijuana irrigation and the potential effects water diversions could have on stream flow in the study watersheds. Our results indicate that water demand for marijuana cultivation has the potential to divert substantial portions of streamflow in the study watersheds, with an estimated flow reduction of up to 23% of the annual seven-day low flow in the least impacted of the study watersheds. Estimates from the other study watersheds indicate that water demand for marijuana cultivation exceeds streamflow during the low-flow period. In the most impacted study watersheds, diminished streamflow is likely to have lethal or sub-lethal effects on state-and federally-listed salmon and steelhead trout and to cause further decline of sensitive amphibian species. PMID:25785849

  8. A case study of particulate impacts on the Grand Canyon from northwestern Mexico

    SciTech Connect

    Eatough, D.J.; Green, M.; Moran, W.; Farber, R.

    1999-07-01

    The concentrations of sulfate measured at Meadview, a remote monitoring site just west of the Grand Canyon National Park, on September 1 and 2, 1992 were the highest concentrations reported at this site in six years of monitoring. During this period, the concentrations of SO{sub 2} at Meadview were also high and about three times the sulfate concentrations. In addition, the concentrations of sulfate and SO{sub 2} were also comparably high between Meadview and the southernmost sampling sites near the Mexican border. Based on ambient atmospheric conditions, emissions from the Mohave Power Project (MPP) 110 km upwind of Meadview could not have been responsible for the majority of the regionally observed sulfur oxides. The geographical distribution of SO{sub 2} and sulfate suggest that northwestern Mexico was a significant source of the unusually high observed sulfur oxides. A CMB model developed during Project MOHAVE was used to apportion sulfur oxides at Meadview and other sampling sites throughout the study region for August 31--September 2, 1992. The results indicate that the contribution of MPP to sulfate at Meadview was typical. However, transport of SO{sub x} from northwestern Mexico was elevated throughout much of the region during this time period. This lead to the large increase in sulfate concentrations at Meadview on September 1 and 2. These results indicate that emissions from Mexico can be a significant source of sulfate in the Grand Canyon.

  9. To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff member, faculty member, or a student that is paid click on the Current Northwestern

    E-print Network

    Shahriar, Selim

    To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff will be searched. Job Opening ID ­ Enter the numeric identifier to search for a specific job opening. Note: If you to search for regular staff or temporary jobs. You will be brought to the Self Service sign in page where

  10. SHRIMP U-Pb zircon geochronological constraints on Cryogenian-Ediacaran tectonomagmatic events in the northwestern Arabian Shield

    NASA Astrophysics Data System (ADS)

    Kozdrój, Wies?aw; Kennedy, Allen; Johnson, Peter R.; Zió?kowska-Kozdrój, Ma?gorzata; Kadi, Khalid

    2014-05-01

    The northwestern Arabian Shield is dominated by juvenile Neoproterozoic crust of the Midyan terrane (MT), composed of volcanosedimentary and multiple phases of intrusive rocks. Terrane protoliths are ~780-550 Ma, and reflect geotectonic changes within a regional framework of the East African Orogeny reflecting progression from a juvenile oceanic island arc and suprasubduction ophiolite to arc-arc collision to continental magmatic arc to crustal thickening with thrusting and strike-slip shearing (Najd fault system) to extensional collapse, within-plate magmatism and final cratonization. The oldest intrusive rocks (the Muwaylih suite) yield middle Cryogenian SHRIMP U-Pb zircon ages: 748±9 Ma for Imdan complex gabbro, and 736.6±9.6 Ma and 738.8±4.2 Ma for Nabt complex diorite and tonalite. They represent pretectonic intrusions in a ~750-720 Ma oceanic island arc made up of Zaam group volcanosedimentary rocks, diamictite, and banded iron formation. Bayda group subaerial felsic metavolcanic rocks (Hijr formation: ~710±12 Ma) are believed to stratigraphically overlie the Zaam group and are interpreted as volcanic equivalents of a younger phase of Muwaylih suite magmatism (~720-710 Ma). Arc-arc collision at ~710-700 Ma between the MT and the Jiddah terrane (JT) to the south resulted in the Yanbu suture and formation of an Andean-type, continental magmatic arc. This phase of continental magmatism is represented by syntectonic, calc-alkaline intrusions such as granodiorite of the Buwaydah complex (686.5±3.7 Ma), a rhyolite dike that intrudes the granodiorite (687.4±2.2 Ma), and late gabbro/diorite of the Imdan complex (676±6 Ma), all of which are assigned to the Hamadat suite (700-680 Ma). Exhumation and erosion of the magmatic arc resulted in formation of post-amalgamation (as related to the already sutured MT and JT), syntectonic basins. One of the oldest basins in the MT, filled with the few-km thick Thalbah group, appears to be intruded by granitic bodies comparable with monzogranite of the Liban complex dated at 634.5±4.6 Ma. Similar, Cryogenian/Ediacaran ages are obtained from syenogranite of the Kara Dakha complex (631.8±4.0 Ma) and Abu Suar complex (626±4 Ma). All three granitoids belong to an early stage of the Marabit suite, and represent peak activity of calc-alkaline, syntectonic arc-related magmatism. A mafic dike dated ~617.7±4.4 Ma intrudes basal sedimentary rocks in the Thalbah basin, constraining the basin minimum deposition age. Ediacaran ages of 609±3.6 Ma from syenogranite of the Ash Shab complex and 608.9±2.8 Ma from monzogranite of the Habd complex, belong to a late stage of the Marabit suite (610-600 Ma), and represent late-tectonic, calc-alkaline magmatism resulting from extensive crustal melting in an extensional regime.

  11. Department of Industrial Engineering and Management Sciences Northwestern University, Evanston, Illinois 60208-3119, U.S.A.

    E-print Network

    Hazen, Gordon

    efficacy compared to the zero dose is regarded as clinically significant then = 1.10. However, it should Studies Ajit C. Tamhane Department of IE/MS and Statistics, Northwestern University Evanston, IL Brent R;1 Introduction Dose response studies are useful in phase II and phase III clinical trials to evaluate efficacy

  12. Potential impacts of northeastern Eurasian snow cover on generation of dust storms in northwestern China during spring

    NASA Astrophysics Data System (ADS)

    Lee, Yun Gon; Ho, Chang-Hoi; Kim, Jhoon; Kim, Jinwon

    2013-08-01

    The effects of the northeastern Eurasian snow cover on the frequency of spring dust storms in northwestern China have been examined for the period 1979-2007. Averaged over all 43 stations in northwestern China, a statistically significant relationship has been found between dust-storm frequency (DSF) and Eurasian snow-water equivalent (SWE) during spring: mean DSF of 7.4 and 3.3 days for years of high- and low SWE, respectively. Further analyses reveal that positive SWE anomalies enhance the meridional gradients of the lower tropospheric temperatures and geopotential heights, thereby strengthening westerly jets and zonal wind shear over northwestern China and western Inner Mongolia of China, the regions of major dust sources. The anomalous atmospheric circulation corresponding to the Eurasian SWE anomalies either reinforces or weakens atmospheric baroclinicity and cyclogenesis, according to the sign of the anomaly, to affect the spring DSF. This study suggests that Eurasian SWE anomalies can be an influential factor of spring DSF in northwestern China and western Inner Mongolia of China.

  13. Global Partner Applicant ~ Global Partner Applicant ~ Global Partner Applicant 02/12 Northwestern University's Feinberg School of Medicine

    E-print Network

    Contractor, Anis

    medical school: refers to any LCME-accredited medical school located in the United States, Canada, or Puerto Rico. Osteopathic medical school: refers to any AOA-accredited Osteopathic medical school. International medical school: refers to all other schools, including Caribbean medical schools. Northwestern

  14. Pub Hlth 445 Syllabus Revised 10.10.13 Northwestern University Programs in Public Health PUB HLTH 445

    E-print Network

    Contractor, Anis

    445 WRITING AND PEER REVIEWING FOR PUBLICATION ­ 1.0 Credit Winter Quarter 2014: January 6 ­ March 14Pub Hlth 445 Syllabus Revised 10.10.13 Northwestern University Programs in Public Health PUB HLTH to Biostatistics Optional ­ but highly desirable ­ Prior research experience with readiness to write your own

  15. THE ROMERAL FAULT SYSTEM: A SHEAR AND DEFORMED EXTINCT SUBDUCTION ZONE BETWEEN OCEANIC AND CONTINENTAL LITHOSPHERES IN NORTHWESTERN SOUTH AMERICA

    Microsoft Academic Search

    GERMAN CHICANGANA

    The Romeral Fault System (RFS) extends 1600 km from Barranquilla-Colombia to Talara city-Peru and before the Pliocene. In the Middle Eocene RFS defi ned the northwestern border of the South America plate, being originated by a triple junction rift - rift - rift occurred from lower to middle Jurassic, when the South American sector separated from Chortis, Oaxaca and Yucatan

  16. Influenza-A viruses in ducks in northwestern Minnesota: fine scale spatial and temporal variation in prevalence and subtype diversity

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Waterfowl from northwestern Minnesota were sampled by cloacal swabbing for Avian Influenza Virus (AIV) from July – October in 2007 and 2008. AIV was detected in 222 (9.1%) of 2,441 ducks in 2007 and in 438 (17.9%) of 2,452 ducks in 2008. Prevalence of AIV peaked in late summer. We detected 27 A...

  17. Nitrous oxide concentrations and stable isotopes in water column and sediment profiles along the southern California and northwestern Mexican margin

    Microsoft Academic Search

    A. Townsend-Small; M. G. Prokopenko; W. Berelson; L. Chong

    2010-01-01

    We present a unique dataset of nitrous oxide concentrations in both water column and sediment profiles from coastal southern California and northwestern Mexico, sites within the intense oxygen minimum zone that extends throughout this region (depths 500-1000 m). Nitrous oxide concentration profiles in the water column indicate that some sites are a positive source of N2O to the atmosphere. At

  18. Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) in northwestern North America

    E-print Network

    Funk, W. Chris

    Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana complex (Rana luteiventris and Rana pretiosa) across its range in northwestern North America to understand March 2008 Revised 9 May 2008 Accepted 27 May 2008 Available online 4 June 2008 Keywords: Rana Spotted

  19. 2013 StudentHealthInsurance Page1 NorthwesternUniversity CAESAR/SES Updated:7/11/2013

    E-print Network

    Shahriar, Selim

    ©2013 StudentHealthInsurance Page1 NorthwesternUniversity CAESAR/SES Updated:7/11/2013 SES/CAESAR v ____________________________________________________________________________________________________________ Student Health Insurance: Instructions for Entering Student Health Insurance Information in CAESAR Follow the instructions below to enroll in or waive the NU-sponsored, Aetna student health insurance on CAESAR. Step 1

  20. Impact and occurrence of Phytophthora rubi and Pratylenchus penetrans in commercial red raspberry (Rubus idaeus) fields in northwestern Washington

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Red raspberry (Rubus idaeus) production is a vital component of northwestern Washington’s agriculture. The main objectives of this study were to document the occurrence of soilborne pathogens Phytophthora rubi and Pratylenchus penetrans in early stage production fields, relate this information to so...