Geology topics
D.E. Detra
Publications and source records attributed to D.E. Detra.
Analytical results and sample locality map of stream-sediment and eolian samples from the Kelso Dunes Wilderness Study Area (CDCA 250), San Bernardino County, California
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Analytical results and sample locality map for rock samples from mineralized localities, Crossman Peak Wilderness Study Area, Mohave County, Arizona
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Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Little Rockies, Mount Pennell, and Mount Hillers Wilderness Study Areas (UT-050-247,248,249), Garfield County, Utah
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Analytical results and sample locality map of stream-sediment, heavy-mineral-concentrate, and rock samples from the Nopah Mountain (CDCA-150) and Resting Spring (CDCA-145) Wilderness Study Areas, Inyo County, California
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Analytical results and sample locality map of stream-sediment and panned-concentrate samples from the Slate Range Wilderness Study Area (CDCA), Inyo County, California
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Analytical results and sample locality map of stream sediment, panned concentrate, and rock samples from the Jayaco Concession area, Dominican Republic
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Analytical and statistical results for stream sediment, panned concentrate, water, and rock samples collected from the Whetstone Roadless Area, Pima and Cochise counties, Arizona
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Chemical and statistical analysis of stream sediments, heavy-mineral concentrates, and rocks of the Hells Gate Roadless Area, Gila County, Arizona
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Geology, geochemistry, and mineral resource potential of the Eighteenmile Wilderness Study Area (ID-43-3), Lemhi County, Idaho (GEM Phase 2)
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Maps showing aeromagnetic survey and geologic interpretation of the Chignik and Sutwik Island quadrangles, Alaska
An aeromagnetic survey over part of the Chignik and Sutwik Island quadrangles, on the southern Alaska Peninsula, was flown in 1977 as part of the Alaska mineral resource assessment program (AMRAP). Maps at scales 1:250,000 and 1:63,360 have been released on open-file (U.s. Geological Survey, 1978a, 1978b). This report includes the aeromagnetic map superimposed on the topographic base (sheet 1) and an interpretation map superimposed on the topographic and simplified geologic base (sheet 2). This discussion provides an interpretation of the aeromagnetic data with respect to regional geology, occurrence of ore deposits and prospects, and potential oil and gas resources. The survey was flown along northwest-southeast lines, spaced about 1.6 km apart, at a nominal elevation of about 300 m above the land surface. A proton-precession magnetometer was used for the survey, and the resulting digital data were computer contoured at intervals of 10 and 50 gammas (sheet 1). The International Geomagnetic Reference Field (IGRF) of 1965, updated to 1977, was removed from the total field data.
Analytical data and statistical summary from the analyses of stream-sediment and heavy-mineral-concentrate samples collected in Bristol Bay, Ugashik, and Karluk quadrangles, Alaska
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