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Articles 3001 - 3030 of 4541
Full-Text Articles in Earth Sciences
Some Post-Pliocene Buried Soils Of Central United States, James Thorp, W. M. Johnson, E. C. Reed
Some Post-Pliocene Buried Soils Of Central United States, James Thorp, W. M. Johnson, E. C. Reed
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Deep Well Guide/Grey Files 121.1, University Of Nebraska - Lincoln
Deep Well Guide/Grey Files 121.1, University Of Nebraska - Lincoln
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Jefferson County Test Hole Logs, Raymond R. Burchett, Frank A. Smith
Jefferson County Test Hole Logs, Raymond R. Burchett, Frank A. Smith
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Box Butte County Test Hole Logs, Frank A. Smith
Box Butte County Test Hole Logs, Frank A. Smith
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Palaeogene Calcareous Nannofossils From Crp-2/2a, Victoria Land Basin, Antarctica, David K. Watkins, G. Villa
Palaeogene Calcareous Nannofossils From Crp-2/2a, Victoria Land Basin, Antarctica, David K. Watkins, G. Villa
Department of Earth and Atmospheric Sciences: Faculty Publications
Rare calcareous nannofossils from the Cape Roberts Project drillhole CRP-2A indicate that this area was episodically invaded by marginal oceanic surface waters during the late and late early Oligocene. These depauperate assemblages lack most of the biostratigraphic index fossils for the Oligocene, but do provide two datums that aid in constraining the age of the section: the last appearance datum (LAD) of Dictyococcites bisectus (23.9 Ma) at 149.28 mbsf and the LAD of Chiasmolithus altus (26.1 Ma) at 412.25 mbsf. Calcareous nannofossil assemblages stratigraphically below c. 440 mbsf contain conspicuous evidence of reworking of older (late Eocene) specimens that renders …
Variability, Petrography And Provenance Of Basement Clasts In Core From Crp-2/2a, Victoria Land Basin, Antarctica, F Talarico, S Sandroni, Christopher R. Fielding, C Atkins
Variability, Petrography And Provenance Of Basement Clasts In Core From Crp-2/2a, Victoria Land Basin, Antarctica, F Talarico, S Sandroni, Christopher R. Fielding, C Atkins
Department of Earth and Atmospheric Sciences: Faculty Publications
Distribution patterns, petrography, whole-rock and mineral chemistry, and shape and fabric data are described for the most representative basement lithologies occurring as clasts (granule to boulder grain-size class) from the 625 m deep CRP-2/2A drillcore. A major change in the distribution pattern of the clast types occurs at c. 310 mbsf, with granitoid-dominated clasts above and mainly dolerite clasts below; moreover, compositional and modal data suggest a further division into seven main detrital assemblages or petrofacies. In spite of this variability, most granitoid pebbles consist of either pink or grey biotite±hornblende monzogranites. Other less common and ubiquitous lithologies include …
Chronostratigraphy Of Crp-2/2a, Victoria Land Basin, Antarctica, G S. Wilson, S. M. Bohaty, Christopher R. Fielding, F Florindo, M J. Hannah, David M. Harwood, W C. Mcintosh, T R. Naish, A. P. Roberts, L Sagnotti, R P. Scherer, C P. Strong, K L. Verosub, G Villa, David K. Watkins, P N. Webb, K J. Woolfe
Chronostratigraphy Of Crp-2/2a, Victoria Land Basin, Antarctica, G S. Wilson, S. M. Bohaty, Christopher R. Fielding, F Florindo, M J. Hannah, David M. Harwood, W C. Mcintosh, T R. Naish, A. P. Roberts, L Sagnotti, R P. Scherer, C P. Strong, K L. Verosub, G Villa, David K. Watkins, P N. Webb, K J. Woolfe
Department of Earth and Atmospheric Sciences: Faculty Publications
The 624.15 m glaciomarine sedimentary succession recovered in the CRP-2/2A drillcore comprises lower Oligocene (< c. 31 Ma) to lower Miocene (18.5 Ma) strata that are overlain by a thin succession of Pliocene and Pleistocene strata. The age model for the CRP-2/2A drillhole, as presented in this paper, is based on combined microfossil biostratigraphy, 40Ar/39Ar ages on volcanic material, 87Sr/86Sr analyses on mollusc shells, and correlation of a magnetic polarity zonation to the magnetic polarity time scale (MPTS). Between 25.92 and 109.05 metres below sea floor (mbsf), several alternative correlations to the MPTS are possible, all of which suggest that sediment accumulation rates averaged ~180 m/m.y. between unconformities, although actual sedimentation rates may have been higher. Between 109.05 and 306.65 mbsf, the age model is straightforward and average sedimentation rates were much higher …
Kinematic Structure Of Minipermeameter Flow, Daniel M. Tartakovsky, J. David Moulton, Vitaly A. Zlotnik
Kinematic Structure Of Minipermeameter Flow, Daniel M. Tartakovsky, J. David Moulton, Vitaly A. Zlotnik
Department of Earth and Atmospheric Sciences: Faculty Publications
Minipermeameters are rapidly becoming a popular tool for collecting localized
measurements of permeability in both laboratory and field studies. While one of the main advantages of minipermeameters is their ability to collect data on various support volumes, there have been only limited attempts to analyze their size and geometry. We define the support volume of minipermeameter measurements as a region containing 90% of the total gas flow, i.e., a region bounded by the 10% streamline. Using our new semianalytical solutions for the Stokes' stream function, we demonstrate that the support volume has a shape of the semitoroid adjacent to the …
Dissolved Solids Sampling Sites And Zones Of Concentration
Dissolved Solids Sampling Sites And Zones Of Concentration
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Validation Of Algorithms For Remote Sensing Of Aerosols Over Land From The Eos Moderate Resolution Imaging Spectroradiometer (Modis), Anatoly Gitelson
Validation Of Algorithms For Remote Sensing Of Aerosols Over Land From The Eos Moderate Resolution Imaging Spectroradiometer (Modis), Anatoly Gitelson
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Late Quaternary Landscape Evolution In The South Fork Of The Big Nemaha River Valley, Southeastern Nebraska And Northeastern Kansas, Rolfe D. Mandel, E. Arthur Bettis Iii, Richard G. Baker, Glen G. Fredlund, Jeremy S. Dillon
Late Quaternary Landscape Evolution In The South Fork Of The Big Nemaha River Valley, Southeastern Nebraska And Northeastern Kansas, Rolfe D. Mandel, E. Arthur Bettis Iii, Richard G. Baker, Glen G. Fredlund, Jeremy S. Dillon
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Arthur County Test Hole Logs, Robert F. Diffendal Jr., James W. Goeke
Arthur County Test Hole Logs, Robert F. Diffendal Jr., James W. Goeke
Conservation and Survey Division: Faculty and Staff Publications
Arthur County, Nebraska test hole logs (2000).
Perkins County Test Hole Logs, Vincent H. Dreeszen
Perkins County Test Hole Logs, Vincent H. Dreeszen
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Rock County Test Hole Logs, Susan Olafsen Lackey, Frank A. Smith, Keonard R. Borcya
Rock County Test Hole Logs, Susan Olafsen Lackey, Frank A. Smith, Keonard R. Borcya
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Pierce County Test Hole Logs, Susan Olafsen Lackey, Frank A. Smith, Raymond R. Burchett
Pierce County Test Hole Logs, Susan Olafsen Lackey, Frank A. Smith, Raymond R. Burchett
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
York County Test Hole Logs, Frank A. Smith
York County Test Hole Logs, Frank A. Smith
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Resource Notes-Academic Year 1999-2000
Resource Notes-Academic Year 1999-2000
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Resource News-Summer 2000
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Principal Reservoirs In Nebraska, University Of Nebraska - Lincoln
Principal Reservoirs In Nebraska, University Of Nebraska - Lincoln
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Oregon Trail/Other Points Of Interest In Nebraska, University Of Nebraska - Lincoln
Oregon Trail/Other Points Of Interest In Nebraska, University Of Nebraska - Lincoln
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Nest Predation On Black-Tailed Prairie Dog Colonies, Bruce Baker, Thomas R. Stanley, Glenn Plumb
Nest Predation On Black-Tailed Prairie Dog Colonies, Bruce Baker, Thomas R. Stanley, Glenn Plumb
United States Geological Survey: Staff Publications
Nest predation is the principal cause of mortality for many grassland birds. Predation rates may be higher on prairie dog colonies because they may have less available nesting cover and may increase predator abundance. We compared 14-day nest predation rates for 1,764 artificial nests on 102 black-tailed prairie dog (Cynovnys ludovicianus) colonies and their paired off-colony sites (similar habitat lacking prairie dogs) from 14 May to 26 June 1998 in South Dakota and Wyoming. Predation rates on colonies (66.2 ± 2.2%; x ± SE) were 29.5% higher than at off-colony sites (51.1 ± 2.7%). Nesting cover on colonies …
Natural And Anthropogenic Influences On The Distribution Of The Threatened Neosho Madtom In A Midwestern Warmwater Stream, Mark L. Wildhaber, Vernon M. Tabor, Daniel W. Mulhern, Kenneth L. Powell, Scott P. Sowa
Natural And Anthropogenic Influences On The Distribution Of The Threatened Neosho Madtom In A Midwestern Warmwater Stream, Mark L. Wildhaber, Vernon M. Tabor, Daniel W. Mulhern, Kenneth L. Powell, Scott P. Sowa
United States Geological Survey: Staff Publications
We attempted to discern the contributions of physical habitat, water chemistry, nutrients, and contaminants from historic lead-zinc mining activities on the riffle-dwelling benthic fish community of the Spring River, a mid western warm water stream that originates in Missouri and flows into Kansas and Oklahoma. The Spring River has a fish community that includes the Neosho madtom Noturus placidus, a species federally listed as threatened. Although anthropogenic factors such as contaminants limited populations and densities of fishes, an integrated assessment of natural and anthropogenic factors was necessary to effectively estimate the influence of the latter. Fish populations in the …
Restoring Ecological Integrity Of Great Rivers: Historical Hydrographs Aid In Defining Reference Conditions For The Missouri River, David L. Galat, Robin Lipkin
Restoring Ecological Integrity Of Great Rivers: Historical Hydrographs Aid In Defining Reference Conditions For The Missouri River, David L. Galat, Robin Lipkin
United States Geological Survey: Staff Publications
Restoring the ecological integrity of regulated large rivers necessitates characterizing the natural flow regime. We applied ‘Indicators of Hydrologic Alteration’ to assess the natural range of variation of the Missouri River’s flow regime at 11 locations before (1929–1948) and after (1967–1996) mainstem impoundment. The 3768 km long Missouri River was divided into three sections: upper basin least-altered from flow regulation, including the lower Yellowstone River; middle basin inter-reservoir, and lower basin channelized. Flow regulation was associated with a reduction in magnitude and duration of the annual flood pulse, an increase in magnitude and duration of annual discharge minima, a reduction …
Holocene Environmental And Climatic Change In The Northern Great Plains As Recorded In The Geochemistry Of Sediments In Pickerel Lake, South Dakota, Walter E. Dean, Antje Schwalb
Holocene Environmental And Climatic Change In The Northern Great Plains As Recorded In The Geochemistry Of Sediments In Pickerel Lake, South Dakota, Walter E. Dean, Antje Schwalb
United States Geological Survey: Staff Publications
The sediments in Pickerel Lake, northeastern South Dakota, provide a continuous record of climatic and environmental change for the last 12000 yr. Sediments deposited between 12 and 6 ka (radiocarbon) show extreme variations in composition, oxygen and carbon isotopic composition of bulk carbonate, carbon isotopic composition of organic matter, and magnetic susceptibility. These variations reflect changes in sources of moisture, regional vegetation types, precipitation-evaporation balance, ground- and surface-water influx, water residence time, erosion, lake productivity, water level, and water temperature. The total carbonate content of late Pleistocene sediments steadily increased from <20% at the base of the core to as much as 80% in sediments deposited between 11 and 9 ka. By about 8 ka, the total carbonate content of the sediments had declined to about 40% where it remained with little variation for the past 8 kyr, suggesting relatively stable conditions. There are marked increases in values of δ13C and δ18O in bulk carbonate, …
Dating Marine Terraces With Relative-Age And Correlated-Age Methods, Daniel R. Muhs
Dating Marine Terraces With Relative-Age And Correlated-Age Methods, Daniel R. Muhs
United States Geological Survey: Staff Publications
Coastal landforms, and particularly emergent marine terraces, a re amongt he most importantg eomorphicfe aturesi n studieso f Quaternarys eal evel fluctuationsa nd neotectonics. A general model, first articulated by Alexander (1953) and borne out by detailedr ecent studieso n many coastlinesi,s that emergent flights of erosional terraces and coral reefs (Fig. 1) are the resulto f glacioeustaticallyc ontrolledf luctuations of global sea level superimposed on steady uplift. Similiarity of U-series ages of coral from both constructional reefsi n the tropicsa nd erosionalt erracesi n midlatitudesh as provided a rigorous test of this model (Mesolella and others, 1969; Bloom and …
Geomorphometry – Diversity In Quantitative Surface Analysis, Richard J. Pike
Geomorphometry – Diversity In Quantitative Surface Analysis, Richard J. Pike
United States Geological Survey: Staff Publications
A widening variety of applications is diversifying geomorphometry (digital terrain modelling), the quantitative study of topography. An amalgam of earth science, mathematics, engineering and computer science, the discipline has been revolutionized by the computer manipulation of gridded terrain heights, or digital elevation models (DEMs). Its rapid expansion continues. This article reviews the remarkable diversity of recent morphometric work in 15 selected topics and discusses their significance and prospects. The quantitative analysis of industrial microsurface topography is introduced to the earth science community. The 14 other topics are Internet access to geomorphometry; global DEMs; DEM modelling of channel networks; …
Single-Dilution Enzyme-Linked Immunosorbent Assay For Quantification Of Antigen-Specific Salmonid Antibody, Stewart W. Alcorn, Ronald J. Pascho
Single-Dilution Enzyme-Linked Immunosorbent Assay For Quantification Of Antigen-Specific Salmonid Antibody, Stewart W. Alcorn, Ronald J. Pascho
United States Geological Survey: Staff Publications
An enzyme-linked immunosorbent assay (ELISA) was developed on the basis of testing a single dilution of serum to quantify the level of antibody to the p57 protein of Renibacterium salmoninarum in sockeye salmon (Oncorhynchus nerka). The levels of antibody were interpolated from a standard curve constructed by relating the optical densities (OD) produced by several dilutions of a high-titer rainbow trout (O. mykiss) antiserum to the p57 protein. The ELISA OD values produced by as many as 36 test sera on each microplate were compared with the standard curve to calculate the antigen-specific antibody activity. Repeated …
Distribution, Speciation, And Transport Of Mercury In Stream-Sediment, Stream-Water, And Fish Collected Near Abandoned Mercury Mines In Southwestern Alaska, Usa, John E. Gray, Peter M. Theodorakos, Elizabeth A. Bailey, Ralph R. Turner
Distribution, Speciation, And Transport Of Mercury In Stream-Sediment, Stream-Water, And Fish Collected Near Abandoned Mercury Mines In Southwestern Alaska, Usa, John E. Gray, Peter M. Theodorakos, Elizabeth A. Bailey, Ralph R. Turner
United States Geological Survey: Staff Publications
Concentrations of total Hg, Hg(II), and methylmercury were measured in stream-sediment, stream-water, and fish collected downstream from abandoned mercury mines in southwestern Alaska to evaluate environmental effects to surrounding ecosystems. These mines are found in a broad belt covering several tens of thousands of square kilometers, primarily in the Kuskokwim River basin. Mercury ore is dominantly cinnabar (HgS), but elemental mercury (Hg °) is present in ore at one mine and near retorts and in streams at several mine sites. Approximately 1400 t of mercury have been produced from the region, which is approximately 99% of all mercury produced from …
Negative Ph And Extremely Acidic Mine Waters From Iron Mountain, California, Darrell Kirk Nordstrom, Charles N. Alpers, Carol J. Ptacek, David W. Blowes
Negative Ph And Extremely Acidic Mine Waters From Iron Mountain, California, Darrell Kirk Nordstrom, Charles N. Alpers, Carol J. Ptacek, David W. Blowes
United States Geological Survey: Staff Publications
Extremely acidic mine waters with pH values as low as -3.6, total dissolved metal concentrations as high as 200 g/L, and sulfate concentrations as high as 760 g/L, have been encountered underground in the Richmond Mine at Iron Mountain, CA. These are the most acidic waters known. The pH measurements were obtained by using the Pitzer method to define pH for calibration of glass membrane electrodes. The calibration of pH below 0.5 with glass membrane electrodes becomes strongly nonlinear but is reproducible to a pH as low as -4. Numerous efflorescent minerals were found forming from these acid waters. These …
Viability Of Piping Plover Charadrius Melodus Metapopulations, Jonathan H. Plissner, Susan M. Haig
Viability Of Piping Plover Charadrius Melodus Metapopulations, Jonathan H. Plissner, Susan M. Haig
United States Geological Survey: Staff Publications
The meta-population viability analysis package, vortex, was used to examine viability and recovery objectives for piping plovers Charadrius melodus, an endangered shorebird that breeds in three distinct regions of North America. Baseline models indicate that while Atlantic Coast populations, under current management practices, are at little risk of near-term extinction, Great Plains and Great Lakes populations require 36% higher mean fecundity for a significant probability of persisting for the next 100 years. Meta-population structure (i.e. the delineation of populations within the meta-population) and inter-population dispersal rates had varying effects on model results; however, spatially-structured meta-populations exhibited lower viability than …