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Red Canyon quadrangle, Colorado Red Canyon quadrangle, Colorado
No abstract available.
Coal beds of the Troublesome quadrangle, Breathitt, Knott, and Perry Counties, Kentucky Coal beds of the Troublesome quadrangle, Breathitt, Knott, and Perry Counties, Kentucky
The coal beds of the Troublesome quadrangle, Kentucky, have been studied as part of a general investigation of the coal resources of eastern Kentucky by the U.S. Geological Survey. The area covered by two maps already published is shown on the index map (fig. 7).
Geologic map of Lake Valley manganese district, Sierra County, New Mexico Geologic map of Lake Valley manganese district, Sierra County, New Mexico
The Lake Valley district was originally developed as a manganese-silver district, but the known silver-bearing ore bodies have long since been worked out. The critical shortage of manganese during World War II renewed interest in the manganese deposits; from October 1941 through June 1942 the U. S. Geological Survey and the U.S. Bureau of Mines conducted a cooperative exploration program...