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Principal coal beds in the Buckhorn quadrangle, Breathitt, Leslie, and Perry Counties, Kentucky Principal coal beds in the Buckhorn quadrangle, Breathitt, Leslie, and Perry Counties, Kentucky
This report on coal in the Buckhorn quadrangle, Kentucky, is the second of a series of preliminary reports published by the U.S. Geological Survey as part of a program of investigation of the geology and coal resources of eastern Kentucky. The first report, Coal Investigations Map C5 (Johnston and Heck, 1950), described the Fire Clay and Whitesburg coals in the Hyden quadrangle. The...
Geologic map of bastnaesite deposits, Birthday claims, San Bernardino County, California Geologic map of bastnaesite deposits, Birthday claims, San Bernardino County, California
In April 1949 a deposit containing considerable quantities of the rare mineral bastnaesite - the fluorocarbonate of cerium, lanthanum, and other rare earths - was discovered near Mountain Pass, San Bernardino County, Calif. Small quantities of bastnaesite have been found in several places in the United States, but this area is the first that offers promise of being a commercial source of...