Ground-water levels, predevelopment ground-water flow, and stream-aquifer relations in the vicinity of the Savannah River Site, Georgia and South Carolina
John S. Clarke, Christopher T. West
1998, Water-Resources Investigations Report 97-4197
Ground-water levels, predevelopment ground-water flow, and stream-aquifer relations in the vicinity of the U.S. Department of Energy Savannah River Site, Georgia and South Carolina, were evaluated as part of a cooperative study between the U.S. Geological Survey, U.S. Department of Energy, and Georgia Department of Natural Resources. As part of...
Geologic map of the MTM -85280 quadrangle, Planum Australe region of Mars
Kenneth E. Herkenhoff
1998, IMAP 2595
The polar deposits on Mars are of great interest because they probably record martian climate variations (Thomas and others, 1992). The area shown on this map includes polar layered deposits with distinct low-albedo features and a sharp boundary between the layered deposits and the moderately cratered unit that forms the...
West margin of North America - A synthesis of recent seismic transects
G. S. Fuis
1998, Tectonophysics (288) 265-292
A comparison of the deep structure along nine recent transects of the west margin of North America shows many important similarities and differences. Common tectonic elements identified in the deep structure along these transects include actively subducting oceanic crust, accreted oceanic/arc (or oceanic-like) lithosphere of Mesozoic through Cenozoic ages. Cenozoic...
Higher temporal variability of forest breeding bird communities in fragmented landscapes
T. Boulinier, James D. Nichols, James E. Hines, John R. Sauer, Curtis H. Flather, Kenneth H. Pollock
1998, Proceedings of the National Academy of Sciences (95) 7497-7501
Understanding the relationship between animal community dynamics and landscape structure has become a priority for biodiversity conservation. In particular, predicting the effects of habitat destruction that confine species to networks of small patches is an important prerequisite to conservation plan development. Theoretical models that predict the occurrence of species in...
Ground-water hydrology and simulated effects of development in the Milford area, an arid basin in southwestern Utah
James L. Mason
1998, Professional Paper 1409-G
A three-dimensional, finite-difference model was constructed to simulate ground-water flow in the Milford area. The purpose of the study was to evaluate present knowledge and concepts of the groundwater system, to analyze the ability of the model to represent past and current (1984) conditions, and to estimate the effects of...
Sediment magnetic data and thermomagnetic determinations of modern and ancient soils and parent materials near McCook, Red Willow County, Nebraska; contributions to Quaternary paleoclimatic studies of midcontinent loess deposits
S. S. Harlan, J. G. Rosenbaum, D.R. Muhs, E. Arthur Bettis III
1998, Open-File Report 98-46
Land status and federal mineral ownership in the Powder River basin, Wyoming and Montana; a digital data set for geographic information systems
Laura Biewick, Shayne R. Urbanowski, Sheila Cain, Larry Neasloney
1998, Open-File Report 98-102
As the Nation's energy resources continue to be examined for development, it is critical that a digital database exist that contains location data for all Federal land and mineral resources. The U.S. Geological Survey (USGS), in cooperation with the Bureau of Land Management (BLM), is collecting these ownership files and...
The ichnologic record of the continental invertebrate invasion; evolutionary trends in environmental expansion, ecospace utilization, and behavioral complexity
Luis A. Buatois, M. Gabirela Mangano, Jorge F. Genise, T.N. Taylor
1998, Palaios (13) 217-240
The combined study of continental trace fossils and associated sedimentary facies provides valuable evidence of colonization trends and events throughout the Phanerozoic. Colonization of continental environments was linked to the exploitation of empty or under-utilized ecospace. Although the nonmarine trace fossil record probably begins during the Late Ordovician, significant invasion...
Description of a discovery process modeling system to forecast future oil and gas incorporating field growth; ARDS Ver. 5.01
J.H. Schuenemeyer, L.J. Drew
1998, Open-File Report 98-111
Status yields and trends of nutrients and sediment and methods of analysis for nontidal data-collection programs, Chesapeake Bay basin, 1985-96
Michael J. Langland, Robert E. Edwards, Linda C. Darrell
1998, Open-File Report 98-17
Data from more than 200 sites in nontidal portions of the Chesapeake Bay were compiled to document annual nutrient and sediment loads and trends for the period 1985 through 1996 as part of the 1997 Reevaluation of the Chesapeake Bay Program goal of reducing nutrient loads 40 percent by the year 2000. Annual...
Methods for estimating tributary streamflow in the Chattahoochee River basin between Buford Dam and Franklin, Georgia
Timothy C. Stamey
1998, Open-File Report 98-63
Simple and reliable methods for estimating hourly streamflow are needed for the calibration and verification of a Chattahoochee River basin model between Buford Dam and Franklin, Ga. The river basin model is being developed by Georgia Department of Natural Resources, Environmental Protection Division, as part of their Chattahoochee River Modeling...
Concentration data and dimensionality in groundwater models: Evaluation using inverse modelling
H.C. Barlebo, M. C. Hill, D. Rosbjerg, K.H. Jensen
1998, Nordic Hydrology (29) 149-178
A three-dimensional inverse groundwater flow and transport model that fits hydraulic-head and concentration data simultaneously using nonlinear regression is presented and applied to a layered sand and silt groundwater system beneath the Grindsted Landfill in Denmark. The aquifer is composed of rather homogeneous hydrogeologic layers. Two issues common to groundwater...
Evaluation of generalized habitat criteria for assessing impacts of altered flow regimes on warmwater fishes
Z.H. Bowen, Mary C. Freeman, K.D. Bovee
1998, Transactions of the American Fisheries Society (127) 455-468
Assessing potential effects of flow regulation on southeastern warmwater fish assemblages is problematic because of high species richness and poor knowledge of habitat requirements for most species. Our study investigated relationships between availability and temporal persistence of key habitats and fish assemblage structure at regulated and unregulated...
Inexpensive automated paging system for use at remote research sites
S.L. Sargent, W.S. Dey, D.A. Keefer
1998, Soil Science Society of America Journal (62) 600-601
The use of a flow-activated automatic sampler at a remote research site required personnel to periodically visit the site to collect samples and reset the automatic sampler. To reduce site visits, a cellular telephone was modified for activation by a datalogger. The purpose of this study was to demonstrate the...
Faulting parameters of the January 16, 1994 Wyomissing Hills, Pennsylvania earthquakes
C.J. Ammon, Robert B. Herrmann, C.A. Langston, H. Benz
1998, Seismological Research Letters (69) 261-269
Two events dominated the January 1994, Wyomissing, PA earthquake sequence, an Mw 4.0 foreshock, followed by an Mw 4.6 mainshock. We modeled regional waveforms to estimate the event depth and the moment tensors for the two largest events in the sequence, and examine teleseismic waveforms recorded on the ARCESS short-period seismic array to estimate...
The effect of canopy cover and seasonal change on host plant quality for the endangered Karner blue butterfly (Lycaeidesmelissasamuelis)
Ralph Grundel, Noel B. Pavlovic, Christina L. Sulzman
1998, Oecologia (114) 243-250
Larvae of the Karner blue butterfly, Lycaeidesmelissasamuelis, feed solely on wild lupine, Lupinusperennis, from the emergence to summer senescence of the plant. Wild lupine is most abundant in open areas but Karner blue females oviposit more frequently on lupines growing in moderate shade. Can differences in lupine quality between open and shaded...
Estimating species richness: The importance of heterogeneity in species detectability
T. Boulinier, James D. Nichols, John R. Sauer, James E. Hines, K. H. Pollock
1998, Ecology (79) 1018-1028
Estimating species richness (i.e., the actual number of species present in a given area) is a basic objective of many field studies carried out in community ecology and is also of crucial concern when dealing with the conservation and management of biodiversity. In most studies, the total number of species...
Paleoclimate simulations for North America over the past 21,000 years: Features of the simulated climate and comparisons with paleoenvironmental data
P. J. Bartlein, K. H. Anderson, P. M. Anderson, M. E. Edwards, C. J. Mock, Robert S. Thompson, R. S. Webb, T. Webb III, C. Whitlock
1998, Quaternary Science Reviews (17) 549-585
Maps of upper-level and surface winds and of surface temperature and precipitation illustrate the results of a sequence of global paleoclimatic simulations spanning the past 21,000 yr for North America. We review (a) the large-scale features of circulation, temperature, and precipitation that appear in the simulations from the NCAR Community Climate...
Contour mapping of relic structures in the Precambrian basement of the Reelfoot rift, North American midcontinent
Rirchard L. Dart, Henri S. Swolfs
1998, Tectonics (17) 235-249
A new contour map of the basement of the Reelfoot rift constructed from drill hole and seismic reflection data shows the general surface configuration as well as several major and minor structural features. The major features are two asymmetric intrarift basins, bounded by three structural highs, and the rift margins....
The effect of rearing methods on survival of reintroduced black-footed ferrets
E. Biggins, Jerry L. Godbey, Louis R. Hanebury, Bob Luce, Paul E. Marinari, Marc R. Matchett, Astrid Vargas
1998, Journal of Wildlife Management (62) 643-653
We estimated minimum survival rates for 282 young-of-year, captive-reared, black-footed ferrets (Mustela nigripes) reintroduced into prairie dog (Cynomys spp.) colonies in Wyoming, Montana, and South Dakota. We used night surveys with spotlights to locate ferrets about 1 month and 9 months postrelease. We modeled minimum survival rates using gender, year,...
Geohydrology of Storage Unit III and a combined flow model of the Santa Barbara and foothill ground-water basins, Santa Barbara County, California
John R. Freckleton, Peter Martin, Tracy Nishikawa
1998, Water-Resources Investigations Report 97-4121
The city of Santa Barbara pumps most of its ground water from the Santa Barbara and Foothill ground-water basins. The Santa Barbara basin is subdivided into two storage units: Storage Unit I and Storage Unit III. The Foothill basin and Storage Unit I of the Santa Barbara basin have been...
More than one way to stretch: A tectonic model for extension along the plume track of the Yellowstone hotspot and adjacent Basin and Range Province
Tom Parsons, George A. Thompson, R.P. Smith
1998, Tectonics (17) 221-234
The eastern Snake River Plain of southern Idaho poses a paradoxical problem because it is nearly aseismic and unfaulted although it appears to be actively extending in a SW-NE direction continuously with the adjacent block-faulted Basin and Range Province. The plain represents the 100-km-wide track of the Yellowstone hotspot during...
Hydrogeologic framework of the Puget Sound aquifer system, Washington and British Columbia
J. J. Vaccaro, Arnold J. Hansen Jr., M. A. Jones
1998, Professional Paper 1424-D
This report presents the generalized hydrogeologic framework of the Puget Sound aquifer system in Washington and British Columbia. The framework includes a conceptual model of the division of the aquifer system into regional hydrogeologic units for describing on a regional basis the ground-water flow in the system. The conceptual model...
Ontogenic and spatial patterns in diet and growth of lake trout in Lake Michigan
Charles P. Madenjian, Timothy J. Desorcie, Ralph M. Stedman
1998, Transactions of the American Fisheries Society (127) 236-252
Lake trout Salvelinus namaycush in nearshore waters of Lake Michigan grow faster than lake trout residing offshore on Sheboygan Reef, which is in midlake. We examined the stomachs of lake trout, spanning ages 1 through 16, caught in both nearshore and offshore environments of Lake Michigan during 1994 and...
Where's the reef: the role of framework in the Holocene
Dennis K. Hubbard, Randolph B. Burke, I. P. Gill
1998, Carbonates and Evaporites (13) 3-9
Holocene reef models generally emphasize the role of in-place and interlocking framework in the creation of a rigid structure that rises above its surroundings. By extension, a number of ancient biohermal deposits have been disqualified as “true reefs” owing to their lack of recognizable framework. Fifty-four cores from several eastern...
