Publications
Filter Total Items: 881
Gypsum-karst collapse in the Black Hills, South Dakota-Wyoming, USA Gypsum-karst collapse in the Black Hills, South Dakota-Wyoming, USA
No abstract available.
Authors
Jack B. Epstein
Kaolinite distribution in Paleocene/Eocene boundary strata of northeastern United States and Pakistan – climatic and stratigraphic implications Kaolinite distribution in Paleocene/Eocene boundary strata of northeastern United States and Pakistan – climatic and stratigraphic implications
No abstract available.
Authors
Thomas G. Gibson, Laurel M. Bybell, Ellen Thomas, James C. Zachos
The East Range, northwestern Nevada: A neglected key to the tectonic history of the region The East Range, northwestern Nevada: A neglected key to the tectonic history of the region
The East Range occupies a strategic position at the western edge of the exposed western facies terrane near the Paleozoic continental margin. There a Cambrian and Ordovician deep-water sequence including the Preble and Valmy Formations is overlain by middle to upper Paleozoic strata that are assigned to three separate stratigraphic sequences on published geologic maps of the range. The...
Authors
Keith B. Ketner, Bruce R. Wardlaw, Anita G. Harris, John E. Repetski
Planktic foraminifer census data from the northwestern Gulf of Mexico Planktic foraminifer census data from the northwestern Gulf of Mexico
No abstract available.
Authors
Harry J. Dowsett, Richard Z. Poore
Constraints on timing and rates of late Cenozoic incision by the Colorado River in Glenwood Canyon, Colorado: A preliminary synopsis Constraints on timing and rates of late Cenozoic incision by the Colorado River in Glenwood Canyon, Colorado: A preliminary synopsis
No abstract available.
Authors
Robert M. Kirkham, Michael J. Kunk, Bruce Bryant, Randall K. Streufert
Digital airborne time domain electromagnetic data from surveys over Cochiti Pueblo, Rio Puerco, and Rio Rancho, New Mexico Digital airborne time domain electromagnetic data from surveys over Cochiti Pueblo, Rio Puerco, and Rio Rancho, New Mexico
The Albuquerque-Santa Fe region is rapidly growing. The Santa Fe Group aquifer in the Middle Rio Grande Basin (MRGB) is the main source of municipal water for the greater Albuquerque metropolitan area and is more limited than previously thought (Thorn et al., 1993). The MRGB, as defined hydrologically and used here, is the area within the Rio Grande Valley extending from Cochiti Dam...
Authors
Maria Deszcz-Pan, B. D. Rodriguez, J. P. Doucette, Michel Godbout, J. M. Williams, D.A. Sawyer, B. D. Stone, V.J. Grauch
Hydrogeologic setting and potential for denitrification in ground water, Coastal Plain of southern Maryland Hydrogeologic setting and potential for denitrification in ground water, Coastal Plain of southern Maryland
The types and distribution of Coastal Plain sediments in the Patuxent River Basin may contribute to relatively low concentrations of nitrate (typically less than 1 milligram per liter) in stream base flow because of the chemical reduction of dissolved nitrate (denitrification) in ground water. Water chemistry data from synoptic stream base-flow surveys in the Patuxent River Basin show...
Authors
David E. Krantz, David S. Powars
Digital geologic map of the Harpers Ferry National Historical Park Digital geologic map of the Harpers Ferry National Historical Park
No abstract available.
Authors
Scott Southworth, D. K. Brezinski, Randall C. Orndorff, Kerry M. Lagueux, Peter G. Chirico
Climatic variability in the eastern United States over the past millennium from Chesapeake Bay sediments Climatic variability in the eastern United States over the past millennium from Chesapeake Bay sediments
Salinity oscillations caused by multidecadal climatic variability had major impacts on the Chesapeake Bay estuarine ecosystem during the past 1000 yr. Microfossils from sediments dated by radiometry (14C, 137Cs, 210Pb) and pollen stratigraphy indicate that salinity in mesohaline regions oscillated 10-15 ppt during periods of extreme drought (low fresh-water discharge) and wet climate...
Authors
Thomas M. Cronin, Debra A. Willard, A. Karlsen, S. Ishman, S. Verardo, John McGeehin, R. Kerhin, C. Holmes, S. Colman, A. Zimmerman
Preliminary stratigraphic database for the subsurface Tertiary and uppermost Cretaceous sediments of Dorchester County, South Carolina Preliminary stratigraphic database for the subsurface Tertiary and uppermost Cretaceous sediments of Dorchester County, South Carolina
No abstract available.
Authors
Gregory Gohn, Laurel M. Bybell, Peter G. Chirico, R. A. Christopher, Lucy E. Edwards, N. O. Frederiksen, D.C. Prowell, Jean Self-Trail, Robert E. Weems
The Central Great Lakes Geologic Mapping Coalition The Central Great Lakes Geologic Mapping Coalition
The State Geological Surveys of Illinois, Indiana, Michigan, and Ohio joined with the U.S. Geological Survey (USGS, under the Earth Surface Dynamics Program) to form the Central Great Lakes Geologic Mapping Coalition. These four States have a similar geologic heritage and need to address common societal issues about land and water resources, the environment, and geologic hazards. By...
Authors
Water Resources Division U.S. Geological Survey