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Page 50 50 51 52 Description of uraniferous areas-Continued Long Pine Hills ____________________________ _ Location and accessibility _______________ _ Earlier investigations ___________________ _ Stratigraphy __________________________ _ Cretaceous and Tertiary rocks _______ _ Hell Creek and Fort Union Formations, undifferentiated (Upper Cretaceous and Paleocene) ____ _ White River Group (Oligocene) __ _ Arikaree Formation (Miocene) __ Structure _____________________________ _ Uranium occurrences ___________________ _ Analyses of water samples ______________ _ Finger Buttes _____________________________ _ Ekalaka Hills and Chalk Buttes _____________ _ Location and accessibility _______________ _ Earlier investigations ___________________ _ Stratigraphic and structural relations _____ _ Uranium occurrences ___________________ _ 46 46 46 46 47 47 47 47 47 47 49 49 49 49 50 50 50 Reporting the analyses ______________________ • ___ _ Rock samples _________________________________ _ Fossil bone ____________________________________ _ Ashed samples of lignite and carbonaceous shale ___ _ Differences in composition between strongly mineralized and weakly mineralized uraniumbearing lignite and carbonaceous shale _____ _ Average perceptages of elements in uraniumbearing lignite and carbonaceous shale _____ _ Average percentages of elements in relatively nonradioactive lignite ____________________ _ Ash content and its relation to uranium mineralization _________________________________ _ Crustal abundance and average compositions of Tertiary tuffaceous rocks, arkose, lignite ash, and fossil bone __________________________________ _ Geochemistry of ground water ___________________ _ Trace elements in bulk water samples ________ _ Summary of geologic and geochemical relations of uranium and discussion of origin ___________________________ _ References cited ____ ~ ______________________________ _

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