Geochemical landscapes of the conterminous United States — New map presentations for 22 elements
N. Gustavsson, B. Bolviken, D. B. Smith, R. C. Severson
2001, Professional Paper 1648
Geochemical maps of the conterminous United States have been prepared for seven major elements (Al, Ca, Fe, K, Mg, Na, and Ti) and 15 trace elements (As, Ba, Cr, Cu, Hg, Li, Mn, Ni, Pb, Se, Sr, V, Y, Zn, and Zr). The maps are based on an ultra low-density...
Geologic maps and cross sections of mine levels at the Pea Ridge iron mine, Washington County, Missouri
C.M. Seeger, L. M. Nuelle, G.B. Sidder, M.A. Marikos, D. C. Smith
2001, Miscellaneous Field Studies Map 2353
This geologic mapping and interpretation of the Pea Ridge iron mine, Missouri, is part of a cooperative effort between the U.S. Geological Survey (USGS) and the Missouri Department of Natural Resources, Division of Geology and Land Survey (DGLS), under the auspices of the USGS Midcontinent Strategic and Critical Minerals Project....
Geophysical signatures used to constrain geologic mapping, narrowing the search for VMS deposits in southeast Alaska
Jeff Wynn, Jon P. Doucette, Susan M. Karl, Anne E. McCafferty, Bruce D. Smith, Peter Bittenbender
2001, Open-File Report 2001-44
No abstract available....
Forearc-basin sedimentary response to rapid Late Cretaceous batholith emplacement in the Peninsular Ranges of southern and Baja California
D.L. Kimbrough, D.P. Smith, J. B. Mahoney, Thomas E. Moore, Marty Grove, R.G. Gastil, Amabel Ortega-Rivera, C.M. Fanning
2001, Geology (29) 491-494
No abstract available....
Interactions between fire and invasive plants in temperate grasslands of North America
James B. Grace, Melinda D. Smith, S.L. Grace, Scott L. Collins, Thomas J. Stohlgren
2001, Conference Paper, Proceedings of the Invasive Species Workshop : the role of fire in the control and spread of invasive species. Fire Conference 2000
A substantial number of invasive grasses, forbs and woody plants have invaded temperate grasslands in North America. Among the invading species are winter annuals, biennials, cool-season perennials, warm-season perennials, vines, shrubs, and trees. Many of these species have been deliberately introduced and widely planted; some are still used for range...
Winter severity and wolf predation on a formerly wolf-free elk herd
L. David Mech, Douglas W. Smith, Kerry M. Murphy, Daniel R. MacNulty
2001, Journal of Wildlife Management (65) 998-1003
We studied wolf (Canis lupus) predation on elk (Cervus elaphus) in Yellowstone National Park from 17 March to 15 April 1997 (severe winter conditions) and from 2 to 31 March 1998 (mild winter conditions) 2-3 years after wolves were reintroduced to the park. Elk composed 91 % of 117 kills....
Passage behavior of radio-tagged yearling Chinook salmon at Bonneville Dam, 2001
S.D. Evans, C. D. Smith, N.S. Adams, D.W. Rondorf
2001, Report
Abstract not available...
Mars Global Surveyor Thermal Emission Spectrometer experiment: Investigation description and surface science results
P. R. Christensen, J. L. Bandfield, V.E. Hamilton, S. W. Ruff, H. H. Kieffer, T.N. Titus, M. C. Malin, R.V. Morris, M. D. Lane, R.L. Clark, B. M. Jakosky, M. T. Mellon, J.C. Pearl, B.J. Conrath, M. D. Smith, R.T. Clancy, R.O. Kuzmin, T. Roush, G.L. Mehall, N. Gorelick, K. Bender, K. Murray, S. Dason, E. Greene, S. Silverman, M. Greenfield
2001, Journal of Geophysical Research E: Planets (106) 23823-23871
The Thermal Emission Spectrometer (TES) investigation on Mars Global Surveyor (MGS) is aimed at determining (1) the composition of surface minerals, rocks, and ices; (2) the temperature and dynamics of the atmosphere; (3) the properties of the atmospheric aerosols and clouds; (4) the nature of the polar regions; and (5)...
3-D imaging of large scale buried structure by 1-D inversion of very early time electromagnetic (VETEM) data
A.A. Aydmer, W.C. Chew, T.J. Cui, D.L. Wright, D.V. Smith, J.D. Abraham
2001, IEEE Transactions on Geoscience and Remote Sensing (39) 1307-1315
A simple and efficient method for large scale three-dimensional (3-D) subsurface imaging of inhomogeneous background is presented. One-dimensional (1-D) multifrequency distorted Born iterative method (DBIM) is employed in the inversion. Simulation results utilizing synthetic scattering data are given. Calibration of the very early time electromagnetic (VETEM) experimental waveforms is detailed...
Leaf conductance decreased under free-air CO2 enrichment (FACE) for three perennials in the Nevada desert
Robert S. Nowak, Lesley A. Defalco, Carolyn S. Wilcox, Dean N. Jordan, James S. Coleman, Jeffrey R. Seemann, Stanley D. Smith
2001, New Phytologist (150) 449-458
A common response of plants to elevated atmospheric CO2 concentration (CO2) is decreased leaf conductance. Consequently, leaf temperature is predicted to increase under elevated CO2.Diurnal patterns of leaf conductance and temperature were measured for three desert perennials, the C3 shrub Larrea tridentata, C3 tussock grass Achnatherum hymenoides and C4tussock grass...
Detection of buried targets using a new enhanced very early time electromagnetic (VETEM) prototype system
T.J. Cui, W.C. Chew, A.A. Aydiner, D.L. Wright, D.V. Smith
2001, IEEE Transactions on Geoscience and Remote Sensing (39) 2702-2712
In this paper, numerical simulations of a new enhanced very early time electromagnetic (VETEM) prototype system are presented, where a horizontal transmitting loop and two horizontal receiving loops are used to detect buried targets, in which three loops share the same axis and the transmitter is located at the center...
Survey protocol for assessment of endangered freshwater mussels the Allegheny River, Pennsylvania
D. R. Smith, R.F. Villella, D. P. Lemarie
2001, Journal of North American Benthological Society (20) 118-132
The United States Endangered Species Act (ESA) requires a biological assessment of any activity that is authorized, funded, or carried out by a federal agency and likely to affect a federally listed endangered species or its critical habitat. We developed a standardized survey protocol for biological assessments of the effects...
Environmental geochemistry at the global scale
J. Plant, D. Smith, B. Smith, L. Williams
2001, Conference Paper, Applied Geochemistry
Land degradation and pollution caused by population pressure and economic development pose a threat to the sustainability of the earth's surface, especially in tropical regions where a long history of chemical weathering has made the surface environment particularly fragile. Systematic baseline geochemical data provide a means of monitoring the state...
Analysis of vegetation controls on bank erosion rates, Clark Fork of the Columbia River, Deer Lodge Valley, Montana
Eleanor R. Griffin, James Dungan Smith
2001, Water-Resources Investigations Report 2001-4115
Airborne geophysical surveys in the Boulder Watershed, Jefferson and Lewis and Clark Counties, Montana
Bruce D. Smith, Victor Franklin Labson, Patricia L. Hill
2000, Open-File Report 2000-240
INTRODUCTIONThree airborne geophysical surveys have been made in the Boulder watershed and adjacent areas (fig. 1). The objectives of the geophysical studies in the watershed is to map subsurface lithologic, structural and hydrologic features important in controlling possible ground water contamination from mining activities and to design remediation efforts. These studies are part of an abandoned...
Soil moisture tendencies into the next century for the conterminous United States
Konstantine P. Georgakakos, Diane E. Smith
2000, Open-File Report 2000-335
A monthly snow-pack and soil- moisture accounting model is formulated for application to each of the climate divisions of the conterminous United States for use in climate impacts-assessment studies. Statistical downscaling and bias-adjustment components complement the model for the assimilation of large-scale global climate model data. Simulations of the formulated...
Ground geophysical study of the Buckeye mine tailings, Boulder watershed, Montana
Robert R. McDougal, Bruce D. Smith
2000, Open-File Report 2000-371
The Buckeye mine site is located in the Boulder River watershed along Basin Creek, in northern Jefferson County, Montana. This project is part of the Boulder River watershed Abandoned Mine Lands Initiative, and is a collaborative effort between the U.S. Geological Survey and Bureau of Land Management in the U.S....
Schlumberger DC resistivity soundings in the Boulder Watershed, Jefferson and Lewis and Clark counties, Montana
Bruce D. Smith, Tracy Sole
2000, Open-File Report 2000-110
During July, 1997, twenty four Schlumberger dc resistivity soundings were made in the Boulder watershed and adjacent areas (fig. 1). The objective of geophysical studies in the watershed is to map subsurface lithologic, structural and hydrologic features important in controlling possible ground water contamination from mining activities and for design...
Geochemical characterization of surface water and streambed sediment of the Blackfoot River, Montana, during low flow conditions, August 16-20, 1998
Sonia A. Nagorski, Temple E. McKinnon, J.N. Moore, D. B. Smith
2000, Open-File Report 2000-3
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...
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...
Relationship of Eastern hemlock (Tsuga canadensis) to the ecology of small streams in Delaware Water Gap National Recreation Area
David P. Lemarie, John A. Young, Craig D. Snyder, Robert M. Ross, David Smith, Randy M. Bennett
2000, General Technical Report NE-267
Hemlock ravines in Delaware Water Gap National Recreation Area (DEWA) are highly valued because of their distinctive aesthetic, recreational and ecological qualities. We conducted a comparative study designed to determine the potential long-term consequences to aquatic communities of the suspected transition from hemlock-dominated forests to mixed hardwood forests as a result of hemlock woolly adelgid (HWA; Adelges...
Addendum to `numerical modeling of an enhanced very early time electromagnetic (VETEM) prototype system'
T.J. Cui, W.C. Chew, A.A. Aydiner, D.L. Wright, D.V. Smith, J.D. Abraham
2000, IEEE Antennas and Propagation Magazine (42) 54-57
Two numerical models to simulate an enhanced very early time electromagnetic (VETEM) prototype system that is used for buried-object detection and environmental problems are presented. In the first model, the transmitting and receiving loop antennas accurately analyzed using the method of moments (MoM), and then conjugate gradient (CG) methods with...
Plant Checklist for Point Reyes National Seashore (Revised)
Gary M. Fellers, Virginia Norris, Wilma Follette, Doreen Smith
2000, Book
No abstract available at this time...
Identification of a basaltic component on the Martian surface from Thermal Emission Spectrometer data
P. R. Christensen, J. L. Bandfield, M. D. Smith, V.E. Hamilton, Roger N. Clark
2000, Journal of Geophysical Research: Planets (105) 9609-9621
The Mars Global Surveyor Thermal Emission Spectrometer (TES) instrument collected 4.8×106 spectra of Mars during the initial aerobraking and science‐phasing periods of the mission (September 14, 1997, through April 29, 1998). Two previously developed atmosphere‐removal models were applied to data from Cimmeria Terra (25°S, 213°W). The surface spectra derived for these...