Revised age of the Rockland tephra, northern California: Implications for climate and stratigraphic reconstructions in the western United States: Comment
Andrei M. Sarna-Wojcicki
2000, Geology (28) 286
Lanphere et al. (1999) presented new data for the age of the Rockland pumice tuff breccia of Wilson (1961) using the incremental-heating 40Ar/39Ar technique. Their age, ∼610 ka, is ∼200 ka older than zircon fission-track ages obtained on this tuff by <a class="link link-ref link-reveal...
Geologic studies in Alaska by the U.S. Geological Survey, 1997
Karen D. Kelley, editor(s)
2000, Professional Paper 1614
The eight papers that follow continue the series of U.S. Geological Survey (USGS) reports on investigations in the geologic sciences in Alaska. The series presents new and sometimes preliminary findings that are of interest to earth scientists in academia, government, and industry; to land and resource managers; and to the...
Direct behavioral evidence that unique bile acids released by larval sea lamprey (Petromyzon marinus) function as a migratory pheromone
Rickard Bjerselius, Weiming Li, John H. Teeter, James G. Seelye, Peter B. Johnson, Peter J. Maniak, Gerold C. Grant, Christine N. Polkinghorne, Peter W. Sorensen
2000, Canadian Journal of Fisheries and Aquatic Sciences (57) 557-569
Four behavioral experiments conducted in both the laboratory and the field provide evidence that adult sea lamprey (Petromyzon marinus) select spawning rivers based on the odor of larvae that they contain and that bile acids released by the larvae are part of this pheromonal odor. First, when tested in a...
Impact of storm-water outfalls on sediment quallity in corpus Christi Bay, Texas, USA
R. Scott Carr, Paul A. Montagna, James M. Biedenbach, Rick Kalke, Mahlon C. Kennicutt, Russell L. Hooten, Geraldine Cripe
2000, Environmental Toxicology and Chemistry (19) 561-574
To determine the quality of sediments and extent of contaminant impacts, a Sediment Quality Triad (SQT) study was conducted at 36 sites in the Corpus Christi Bay, Texas, USA, system. Fifteen of the 36 sites were located near storm-water outfalls, but 13 other sites (i.e., industrial and domestic outfalls, oil...
Trends in surface-water quality during implementation of best-management practices in Mill Creek and Muddy Run Basins, Lancaster County, Pennsylvania
Edward H. Koerkle
2000, Fact Sheet 168-99
Analyses of water samples collected over a 5-year period (1993-98) in the Mill Creek and Muddy Run Basins during implementation of agricultural best-management practices (BMP’s) indicate statistically significant trends in the concentrations of several nutrient species and in nonfilterable residue (suspended solids). The strongest trends identified were those indicated by...
Using OTIS to model solute transport in streams and rivers
Robert L. Runkel
2000, Fact Sheet 138-99
Solute transport in streams and rivers is governed by a suite of hydrologic and geochemical processes. Knowledge of these processes is needed when assessing the fate of contaminants that are released into surface waters. The study of solute fate and transport often is aided by solute transport models that mathematically...
Water levels and ground-water discharge, regional aquifer system of the midwestern Basins and Arches Region, in parts of Indiana, Ohio, Illinois, and Michigan
Sandra M. Eberts
2000, Hydrologic Atlas 725
Aquifers in Quaternary glacial deposits and the underlying Silurian and Devonian carbonate bedrock in parts of Indiana, Ohio, Illinois, and Michigan compose the regional aquifer system under investigation as part of the Midwestern Basins and Arches Regional Aquifer System Analysis (Midwestern Basins and Arches—RASA) project of the U.S. Geological Survey...
Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma counties, California
M.C. Blake Jr., D. L. Jones, R. W. Graymer, Adam digital database by Soule
2000, Miscellaneous Field Studies Map 2337
This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (mageo.txt, mageo.pdf, or mageo.ps), it provides current information on the geologic structure and stratigraphy...
Public water-supply use in Kansas, 1987–97
Joan F. Kenny
2000, Fact Sheet 187-99
Annual State reporting requirements yield data on public water-supply use in Kansas. data is essential for responsible and effective use of the information by various State agencies. This fact sheet describes water-use data evaluation, illustrates variations in public-supply water use from 1987 through 1997, and documents improvements in water conservation...
Compositional analyses of small lunar pyroclastic deposits using Clementine multispectral data
Lisa R. Gaddis, Bernard Ray Hawke, Mark S. Robinson, Cassandra Coombs
2000, Journal of Geophysical Research E: Planets (105) 4245-4262
Clementine ultraviolet-visible (UVVIS) data are used to examine the compositions of 18 pyroclastic deposits (15 small, three large) at 13 sites on the Moon. Compositional variations among pyroclastic deposits largely result from differing amounts of new basaltic (or juvenile) material and reworked local material entrained in their ejecta upon eruption....
Mineralogic and compositional properties of Martian soil and dust: results from Mars Pathfinder
J.F. Bell III, H.Y. McSween Jr., J.A. Crisp, R.V. Morris, S.L. Murchie, N.T. Bridges, J. R. Johnson, D.T. Britt, M.P. Golombek, H. J. Moore, A. Ghosh, J.L. Bishop, R. C. Anderson, J. Bruckner, T. Economou, J.P. Greenwood, H.P. Gunnlaugsson, R.M. Hargraves, S. Hviid, J. M. Knudsen, M.B. Madsen, R. Reid, R. Rieder, L. Soderblom
2000, Journal of Geophysical Research E: Planets (105) 1721-1755
Mars Pathfinder obtained multispectral, elemental, magnetic, and physical measurements of soil and dust at the Sagan Memorial Station during the course of its 83 sol mission. We describe initial results from these measurements, concentrating on multispectral and elemental data, and use these data, along with previous Viking, SNC meteorite, and...
National land-cover pattern data
Kurt H. Riitters, James D. Wickham, James Vogelmann, K. Bruce Jones
2000, Ecology (81) 604
Land cover and its spatial patterns are key ingredients in ecological studies that consider large regions and the impacts of human activities. Because land-cover maps show only cover types and their locations, further processing is needed to extract pattern information and to characterize its spatial variability. We are producing a...
Hydrogeology and hydrogeologic terranes of the Blue Ridge and Piedmont Physiographic Provinces in the eastern United States
Thomas O. Mesko, Lindsay A. Swain, E. F. Hollyday
2000, Hydrologic Atlas 732-B
Severe and prolonged droughts between 1961 and 1988, combined with increased demands for freshwater supplies in the United States, have resulted in a critical need to assess the potential for development of ground- and surface-water supplies. Rapid industrial growth and urban expansion have caused existing freshwater supplies to be used...
Development of a pore network simulation model to study nonaqueous phase liquid dissolution
Leslie A. Dillard, Martin J. Blunt
2000, Water Resources Research (36) 439-454
A pore network simulation model was developed to investigate the fundamental physics of nonequilibrium nonaqueous phase liquid (NAPL) dissolution. The network model is a lattice of cubic chambers and rectangular tubes that represent pore bodies and pore throats, respectively. Experimental data obtained by Powers [1992] were used to develop and validate the...
The land cover trends project: A strategy for monitoring land cover change at a national scale
Terry L. Sohl, Thomas Loveland, Kristi L. Sayler, Alisa L. Gallant, Roger F. Auch, Darrell E. Napton
T.I. Stein, editor(s)
2000, Conference Paper, EEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings
Policy-makers and scientists often require comprehensive data on the types and rates of land use and land cover change at a variety of scales. However, there is generally a lack of local, regional, and national land use and land cover data of sufficient reliability and temporal and geographic detail for...
National Geochemical Database, U.S. Geological Survey RASS (Rock Analysis Storage System) geochemical data for Alaska
E. A. Bailey, D. B. Smith, C. C. Abston, Matthew Granitto, K. A. Burleigh
2000, Open-File Report 99-433
This dataset contains geochemical data for Alaska produced by the analytical laboratories of the Geologic Division of the U.S. Geological Survey (USGS). These data represent analyses of stream-sediment, heavy-mineral-concentrate (derived from stream sediment), soil, and organic material samples. Most of the data comes from mineral resource investigations conducted in the...
Effort explores 130 Million years of Antarctic paleoenvironment
Yngve Kristoffersen, I.D. Goodwin, Alan K. Cooper
2000, Eos, Transactions, American Geophysical Union (81) 36-37
Antarctic climate history has been dominated by events and turning points with causes that are poorly understood. To fill the gaps in our knowledges new effort is underway in the international geologic community to acquire and coordinate the circum‐Antarctic geologic data needed to derive and model paleoenvironments of the past...
Primary food resources in the Sacramento-San Joaquin Delta
Alan D. Jassby, James E. Cloern
2000, Interagency Ecological Program Newsletter (13) 21-25
The Sacramento-San Joaquin River Delta, a complex mosaic of tidal freshwater habitats, is now a focus of ecosystem rehabilitation because of changes in critical functions associated with its geographic location at the landestuary interface. One of these functions is the production, transport, and transformation of organic matter that constitutes the...
Changes in North Atlantic deep-sea temperature during climatic fluctuations of the last 25,000 years based on ostracode Mg/Ca ratios
Gary S. Dwyer, Thomas M. Cronin, Paul A. Baker, Julio Rodriguez-Lazaro
2000, Geochemistry, Geophysics, Geosystems (1)
We reconstructed three time series of last glacial-to-present deep-sea temperature from deep and intermediate water sediment cores from the western North Atlantic using Mg/Ca ratios of benthic ostracode shells. Although the Mg/Ca data show considerable variability (“scatter”) that is common to single-shell chemical analyses, comparisons between cores, between core top...
Stations in the USGS's National Stream Quality Accounting Network (NASQAN)
Keri Hitt
2000, Report
This is a point coverage of stations in the U.S. Geological Survey's National Stream Quality Accounting Network (NASQAN). NASQAN was established in 1973. Water-quality data currently is collected at NASQAN sites on bimonthly and quarterly intervals. However, some of the bimonthly stations will be sampled only five times a...
Streamflow changes in the Sierra Nevada, California, simulated using a statistically downscaled general circulation model scenario of climate change
Robert L. Wilby, Michael D. Dettinger
2000, Book chapter, Linking climate change to land surface change
Simulations of future climate using general circulation models (GCMs) suggest that rising concentrations of greenhouse gases may have significant consequences for the global climate. Of less certainty is the extent to which regional scale (i.e., sub-GCM grid) environmental processes will be affected. In this chapter, a range of downscaling techniques...
Northeastern Gulf of Mexico Coastal and Marine Ecosystem Program: Coastal Characterization: an overview and update
James B. Johnston, Lawrence R. Handley, William R. Jones, Steve Robb
2000, Minerals Management Service MMS 2000-030
The U.S. Geological Surveys Biological Resources Division (BRD) mission is to provide leadership in gathering, analyzing, and disseminating biological information as support for sound management of the Nation's natural resources. Since becoming operational in October of 1996 through the transfer of programs from various bureaus within the Department of the Interior, the BRD,...
Prodigious polyphyly in imperilled freshwater pearly-mussels (Bivalvia: Unionidae): a phylogenetic test of species and generic designations
Charles Lydeard, Russell L. Minton, James D. Williams
2000, Geological Society Special Publication (177) 145-158
Unionid bivalves or freshwater pearly-mussels (Unionoidea: Unionidae) serve as an exemplary system for examining many of the problems facing systematists and conservation biologists today. Most of the species and genera were described in the late 1800s and early 1900s, but few phylogenetic studies have been conducted to test conventional views...
TES observations of the martian surface and atmosphere
P. R. Christensen, H. H. Kieffer, J.C. Pearl, B. Conrath, M. C. Malin, R.C. Clark, R.V. Morris, J.L. Banfield, M. D. Lane, M. D. Smith, V.E. Hamilton, R.O. Kuzmin
2000, Book, Second International Conference on Mars Polar Science and Exploration
The TES instrument is a Fourier transform Michelson interferometer operating with 10 or 5 cm-1 sampling int he thermal infared spectral region from 1700 to 200 cm-1 (~6 to 50 μm) where virtually all minerals have characteristic fundamental vibrational absorption bands (1, 2, 3, 4, 5, 6, 7, 8). The...
Data for Quaternary faults in western Montana
Kathleen M. Haller, Richard L. Dart, Michael N. Machette, Michael C. Stickney
2000, Open-File Report 2000-411
The "World Map of Major Active Faults" Task Group is compiling published fault data, developing a digital database of the fault data, and preparing a series of maps for the United States and other countries in the western Hemisphere. The data is intended to portray the locations, ages, and activity rates of...
