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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts U.S. Geological Survey Brooks, Alfred Hulse Boutwell, John Mason Bramlette, Milton Nunn Tags (with Type= category ) photographers (4) View Results as: JSON ATOM CSV

Looking north to brown weathering gravel beds. Alaska. August 22, 1902. Looking north to brown weathering gravel beds. Alaska. August 22, 1902. Categories: Image; Tags: Alaska Images, Brooks, A.H. Collection, Photographers, photo print Fox. Alaska. September 3, 1903. Fox. Alaska. September 3, 1903. Categories: Image; Tags: Alaska Images, Brooks, A.H. Collection, Photographers, photo print Concentric banding and faint bedding shown in polished and etched faces of an opal concretion from the same locality as photo 14. San Luis Obispo County, California. 1931. Concentric banding and faint bedding shown in polished and etched faces of an opal concretion from the same locality as photo 14. San Luis Obispo County, California. 1931. Plate 7-C, in U.S.Geological Survey Professional paper 212. 1943. Categories: Image; Tags: Bramlette, M.N. Collection, California Professional Paper 212, Photographers, Photographers, Professional Papers, All tags... photo print, Fewer tags Photomicrograph of fresh and decomposed mineralized monzonite, development of pyrite in altered monzonite, from Eldorado shaft, Boston Consolidated group. Salt Lake County, Utah. 1900. Photomicrograph of fresh and decomposed mineralized monzonite, development of pyrite in altered monzonite, from Eldorado shaft, Boston Consolidated group. Magnetite and original biotite are absent, pyrite appears embedded in secondary quartz associated with flocculent aggregates of biotite, probably secondary. Feldspathic constituents have gone over to sercicite. Salt Lake County, Utah. 1900, plate 26-B in U.S. Geological Survey. Professional paper 38. 1905. Categories: Image; Tags: Boutwell, J.M. Collection, Photographers, Photomicrographs, photo print