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Page 360, results 8976 - 9000

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Hydrologic and water-quality data related to the occurrence of arsenic for areas along the Madison and Upper Missouri Rivers, southwestern and west-central Montana
L.K. Tuck, D.M. Dutton, D. A. Nimick
1997, Open-File Report 97-203
Geothermal waters in Yellowstone National Park contribute large quantities of arsenic to the headwaters of the Madison River. Water in some Quaternary and Tertiary valley-fill deposits along the Madison and upper Missouri Rivers also is locally enriched in arsenic. Arsenic in surface and ground water in these...
Debris-flow hazards in areas affected by the June 27, 1995, storm in Madison County, Virginia
B. A. Morgan, G. F. Wieczorek, R. H. Campbell, P. L. Gori
1997, Open-File Report 97-438
A severe storm on June 27, 1995 triggered hundreds of rock, debris and soil slides from the steep hillsides of Madison County, Virginia. Most of these transformed into debris flows that inundated areas downslope causing damage to structures, roads, utilities, livestock and crops. This report contains an analysis of areas...
Maps showing the surficial geology of the Culebra shelf, Puerto Rico
M. A. Hampton, M.E. Torresan, Juan L. Trias, D. W. Folger, F. L. Wong
1997, Open-File Report 97-290
This study presents the surficial and shallow subbottom geology of the insular shelf around Culebra, Puerto Rico. In view of the need for sand and gravel for construction purposes in the area, we inferred the thickness of unlithified, surficial sediment deposits from high-resolution acoustic-reflection profiles and described seafloor sediment samples...
Sub-crop geologic map of pre-Tertiary rocks in the Yucca Flat and northern Frenchman Flat areas, Nevada Test Site, southern Nevada
J. C. Cole, Anita G. Harris, Ronald R. Wahl
1997, Open-File Report 97-678
This map displays interpreted structural and stratigraphic relations among the Paleozoic and older rocks of the Nevada Test Site region beneath the Miocene volcanic rocks and younger alluvium in the Yucca Flat and northern Frenchman Flat basins. These interpretations are based on a comprehensive examination and review of data for...
Preliminary Volcano-Hazard Assessment for Redoubt Volcano, Alaska
Christopher F. Waythomas, Joseph M. Dorava, Thomas P. Miller, Christina A. Neal, Robert G. McGimsey
1997, Open-File Report 97-857
Redoubt Volcano is a stratovolcano located within a few hundred kilometers of more than half of the population of Alaska. This volcano has erupted explosively at least six times since historical observations began in 1778. The most recent eruption occurred in 1989-90 and similar eruptions can be expected in the...
National Geochemical Database: Reformatted data from the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program
Steven M. Smith
1997, Open-File Report 97-492
The National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program produced a large amount of geochemical data. To fully understand how these data were generated, it is recommended that you read the History of NURE HSSR Program for a summary of the entire program. By the time the...
Geologic map of the Dillon quadrangle, Summit and Grand Counties, Colorado
Karl S. Kellogg
1997, Open-File Report 97-738
New 1:24,000-scale geologic mapping along the Interstate-70 urban corridor in western Colorado, in support of the USGS Central Region State/USGS Cooperative Geologic Mapping Project, is contributing to a more complete understanding of the stratigraphy, structure, tectonic evolution, and hazard potential of this rapidly developing region. The 1:24,000-scale Dillon quadrangle...