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Page 4959, results 123951 - 123975

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Map showing the distribution of selected mineral assemblages in nonmagnetic heavy-mineral concentrates from stream sediments from the Vasquez Peak Wilderness Study Area, and the Williams Fork and St. Louis Peak Roadless Areas, Clear Creek, Grand, and Summit counties, Colorado
R. G. Eppinger, P. K. Theobald, S. J. Sutley
1985, Miscellaneous Field Studies Map 1588-F
The U.S. Geological Survey and the U.S. Bureau of Mines conducted field studies from 1979 through 1983 to assess the mineral resource potential of the Vasquez Peak Wilderness Study Area (acreage: 16,000), the Williams Fork Roadless Area (acreage: 74,820), and the St. Louis Peak Roadless Area (acreage: 12,800).  Included were...
Interpretations from multichannel seismic-reflection profiles of the deep crust crossing South Carolina and Georgia from the Appalachian Mountains to the Atlantic Coast
John C. Behrendt
1985, Miscellaneous Field Studies Map 1656
Over the past decade, the U.S. Geological Survey (USGS) has been investigating the cause of the Charleston, S.C., earthquake of 1886 and the likelihood of future earthquakes of similar magnitude (mb 6.9–7.2, Bollinger, 1977). As part of that work, multichannel reflection surveys were started in 1979 in the Charleston area,...
Map of fault scarps formed in unconsolidated sediments, Elko 1 degree by 2 degrees Quadrangle, Nevada and Utah
Theodore P. Barnhard
1985, Miscellaneous Field Studies Map 1791
The accompanying map shows nine areas where fault scarps formed in unconsolidated sediments in the Elko 1°x2° quadrangle, northeastern Nevada and westernmost Utah.  The faulted sediments include pebbly to bouldery colluvium, alluvium, and pediment gravels.  They are inferred to have been deposited in Quaternary time during the last phase of...
Development and calibration of a two-dimensional digital model for the analysis of the ground-water flow system in the San Antonio Creek Valley, Santa Barbara County, California
Peter Martin
1985, Water-Resources Investigations Report 84-4340
A two-dimensional finite-difference model was used to simulate ground-water flow conditions in San Antonio Creek valley. The model was calibrated to simulate steady-state conditions as approximated by ground-water conditions in 1943 and transient conditions during the period 1944-77. The transmissivity of the aquifer and the vertical hydraulic conductivity of the...
Cost-effectiveness of the stream-gaging program in North Carolina
R.R. Mason, N.M. Jackson
1985, Water-Resources Investigations Report 85-4036
This report documents the results of a study of the cost-effectiveness of the stream-gaging program in North Carolina. Data uses and funding sources are identified for the 146 gaging stations currently operated in North Carolina with a budget of $777,600 (1984). As a result of the study, eleven stations are...
Geohydrologic units of the Gulf Coastal Plain in Arkansas
J. C. Petersen, M.E. Broom, W. V. Bush
1985, Water-Resources Investigations Report 85-4116
This report describes geohydrologic units of the Jurassic, Cretaceous, Tertiary and Quaternary Systems and of the Paleozoic Era in the Gulf Coastal Plain in Arkansas. Structure contour maps on top of the Paleozoic rocks, Trinity Group, Tokio Formation, Nacatoch Sand, Midway Group, Wilcox Group, Carrizo Sand, Cane River Formation. Sparta...