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Page 5170, results 129226 - 129250

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Relationship of landslides to fractures in Potomac Group deposits, Fairfax County, Virginia
William H. Langer, Stephen F. Obermeier
1978, Open-File Report 78-779
Landsliding is a common problem in eastern Fairfax County, an area underlain by Potomac Group (Lower Cretaceous) Coastal Plain deposits of silt and clay interbedded and interfingered with sand and gravel. The slides commonly are present in clay and silt that, on the basis of laboratory tests, appear to be...
Mass movement and storms in the drainage basin of Redwood Creek, Humboldt County, California — A progress report
Deborah Reid Harden, Richard J. Janda, K. Michael Nolan
1978, Open-File Report 78-486
Numerous active landslides are clearly significant contributors to high sediment loads in the Redwood Creek basin. Field and aerial-photograph inspections indicate that large mass-movement features, such as earthflows and massive streamside debris slides, occur primarily in terrain underlain by unmetamorphosed or slightly metamorphosed sedimentary rocks. These features cannot account for...
Discrimination of hydrothermally altered rocks along the Battle Mountain-Eureka, Nevada, mineral belt using Landsat images
M. Dennis Krohn, Michael J. Abrams, Lawrence C. Rowan
1978, Open-File Report 78-585
Landsat Multispectral Scanner (MSS) images of the northwestern part of the Battle Mountain-Eureki, Nevada mineral belt were evaluated for distinguishing hydrothermally altered rocks associated with porphyry copper and disseminated gold deposits. Detection of altered rocks from Landsat is based on the distinctive spectral reflectance of limonite present at coatings on...
Selected water-level records for Oklahoma, 1975-1977
Robert L. Goemaat, Dannie E. Spiser
1978, Open-File Report 78-721
A systematic program to collect water-level records in Oklahoma began in 1937. The objectives of this program are (1) to provide long-term records of water-level fluctuations in representative wells, (2) to facilitate the prediction of water-level trends and indicate future availability of ground-water supplies, and (3) to provide information for...
Catalog of locations of U.S.G.S. instruments recording low-frequency data in California
William B. Daul, M.J.S. Johnston
1978, Open-File Report 78-358
During the past few years, the U.S. Geological Survey has installed many different types of instrumentation for the observation and detection of crustal deformation within the San Andreas fault system. In order to have an effective earthquake prediction program, it is important to have continuous data from these instruments collected...
Water table in the surficial aquifer and potentiometric surface of the Floridan Aquifer in selected well fields, west-central Florida, September 1977
Paul D. Ryder, L. R. Mills
1978, Open-File Report 78-311
The water table in the surficial aquifer and the potentiometric surface of the Floridan aquifer in a 1,200 square-mile area in west-central Florida are mapped semiannually by the U.S. Geological Survey. Maps are prepared on the basis of water levels measured in wells each May to coincide with seasonal low...
A magnesium correction for the Na-K-Ca chemical geothermometer
R.O. Fournier, Robert W. Potter
1978, Open-File Report 78-986
Graphs and equations have been devised to correct for the adverse effects of magnesium upon the Na-K-Ca geothermometer. Either the graphs or equations can be used to determine temperature corrections when given waters have Na-K-Ca calculated temperatures above 70? C and values of R less than 50, where R =...
Hydrogeologic maps of proposed flood detention area proposed by Southwest Florida Water Management District, Green Swamp area, Florida
A. T. Rutledge, Hayes F. Grubb
1978, Open-File Report 78-460
Information about the hydrogeology of that part of the Green Swamp area which has been designated by Southwest Florida Water Management District as the flood detention area is given on seven maps. The maps show (1) core-hole numbers, (2) sand thickness, (3) clay thickness, (4) clay vertical hydraulic conductivity, (5)...