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36989 results.

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Geology of the northern Black Hills bentonite mining district
Sam H. Patterson
1955, Open-File Report 55-131
Extensive deposits of bentonite are present in the Cretaceous sedimentary rock strata cropping out on the northern flank of the Black Hills. These deposits have been the subject of a study by the U.S. Geological Survey as part of the program of the Department of the Interior for appraisal of...
Phosphate deposits in northern Alaska
William Wallace Patton Jr.
1955, Open-File Report 55-132
Deposits of low and medium grade phosphate rock were found recently at seven localities on the Arctic slope of Alaska. They were reported by field parties of the U.S. Geological Survey during the mapping of Naval Petroleum Reserve No. 4 and adjacent areas. The deposits are sedimentary in origin and...
Fitting curves to cyclic data
W. B. Langbein
1955, Open-File Report 55-91
A common problem in hydrology is to fit a smooth curve to cyclic or periodic data, either to define the most probable values of the data or to test some principle that one wishes to demonstrate.  This study treats of those problems where the length or period of the cycle...
Uranium in the Gas Hills area, Fremont and Natrona Counties, Wyoming
J. D. Love
1955, Open-File Report 55-98
Uranium minerals have been discovered in the Wind River formation of early Eocene age, strata of middle and late Eocene age, and the Thermopolis shale of early Cretaceous age in the Gas Hills area of central Wyoming.  The localities of uranium mineralization were found independently by prospectors and by geologists...