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Page 319, results 7951 - 7975

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Seismic-reflection surveys of the Blake Ridge, R/V Cape Hatteras 1992 and 1995: Data acquisition, navigation, and processing
Michael H. Taylor, William P. Dillon, Christopher H. Anton, William W. Danforth
1999, Open-File Report 99-372
As part of an ongoing study, seismic-reflection profiles were collected over the Blake Ridge in 1992 and 1995, in order to map the volume and distribution of methane hydrate. Faulting and seafloor instabilities appear to be related to methane hydrate processes at the Blake Ridge. Seismic profiles display a prominent...
Principal facts for gravity stations and physical property measurements in the Lake Mead 30' by 60' quadrangle, Nevada and Arizona
V.E. Langenheim, J. G. Davidson, M.L. Anderson, H. R. Blank Jr.
1999, Open-File Report 99-435
The U.S. Geological Survey (USGS) collected 811 gravity stations on the Lake Mead 30' by 60' quadrangle from October, 1997 to September, 1999. These data were collected in support of geologic mapping of the Lake Mead quadrangle. In addition to these new data, gravity stations were compiled from a number...
Geochemical data for environmental studies of mineral deposits at Nabesna, Kennecott, Orange Hill, Bond Creek, Bremner, and Gold Hill, Wrangell-St. Elias National Park and Preserve, Alaska
R. G. Eppinger, Paul H. Briggs, D. S. Rosenkrans, Vanessa Ballestrazze, Jose Aldir, Z. A. Brown, J.G. Crock, W. M. d’Angelo, M. W. Doughten, D.L. Fey, P. L. Hageman, R.T. Hopkins, R. J. Knight, M.J. Malcolm, J. B. McHugh, A. L. Meier, J. M. Motooka, R. M. O’Leary, B. H. Roushey, S.J. Sultley, P. M. Theodorakos, S. A. Wilson
1999, Open-File Report 99-342
Environmental geochemical investigations were carried out between 1994 and 1997 in Wrangell-St. Elias National Park and Preserve (WRST), Alaska. Mineralized areas studied include the historic Nabesna gold mine/mill and surrounding areas; the historic Kennecott copper mill area and nearby Bonanza, Erie, Glacier, and Jumbo mines; the historic mill and gold...
Inversion of gravity data to define the pre-Tertiary surface and regional structures possibly influencing ground-water flow in the Pahute Mesa-Oasis Valley region, Nye County, Nevada
T.G. Hildenbrand, V.E. Langenheim, E. A. Mankinen, E.H. McKee
1999, Open-File Report 99-49
A three-dimensional inversion of gravity data from the Pahute Mesa–Oasis Valley region reveals a topographically complex pre-Tertiary basement surface. Beneath Pahute Mesa, the thickness of the Tertiary volcanic deposits may exceed 5 km within the Silent Canyon caldera complex. South of Pahute Mesa in Oasis Valley, basement is shallower (<...
Spatial geologic data model for the Gunnison, Grand Mesa, Uncompahgre National Forests mineral resource assessment area, southwestern Colorado and digital data for the Leadville, Montrose, Durango, and Colorado parts of the Grand Junction, Moab, and Cortez 1° x 2° geologic maps
W. C. Day, G.N. Green, D. H. Knepper Jr., R. C. Phillips
1999, Open-File Report 99-427
The digital geologic and geographic information system (GIS) data presented here were prepared to aid in Grand Mesa, Uncompahgre, Gunnison National Forest (GMUG) mineral resource assessment Project studies by the U.S. Geological Survey Mineral Resource Program. The goals of the GMUG Project is to provide mineral resource data and an...
Assessing environmental contaminant threats to lands and biota managed by the U.S. Fish and Wildlife Service
James Coyle, Craig Moore, R. Sky Bristol, Mary G. Henry, Tim Hall, Tim Kubiak
1999, Open-File Report 99-108
The Contaminant Assessment Process (CAP) is a standardized approach for documenting and assessing threats posed by environmental contaminants to lands and biota managed by the Department of the Interior (DOI). The Biomonitoring of Environmental Status and Trends (BEST) Program of the U.S. Geological Survey Biological Resources Division (USGS/BRD) developed the...
Sediment color and reflectance record from Ocean Drilling Program Hole 625B, Gulf of Mexico (marine isotope stage 5 interval)
Harry J. Dowsett
1999, Open-File Report 99-413
Analysis of climate indicators from the North Atlantic, California Margin, and ice cores from Greenland suggest millennial scale climate variability is a component of earth's climate system during the last interglacial period (marine oxygen isotope stage 5). The USGS is involved in a survey of high resolution marine records covering...