- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A local name used in the Paradox Valley, Colorado, for a black, vanadium-bearing sandstone.
Industry:Mining
A local name used in the Paradox Valley, Colorado, for a black, vanadium-bearing sandstone.
Industry:Mining
A local New York and Pennsylvania term applied by bluestone quarrymen to open joints that extend east and west.
Industry:Mining
A local steepening in an otherwise uniform gentle dip. Compare: anticlinal bend; homocline; flexure. Adj: monoclinal. Obsolete syn: unicline.
Industry:Mining
A local tectonic breccia composed of angular fragments resulting from the sharp folding of thin-bedded, brittle rock layers between which are incompetent ductile beds; e.g., a breccia formed where interbedded chert and shale are sharply folded. Compare: tectonic breccia
Industry:Mining
A local term in Ohio for sandstone beds that show crossbedding on a small scale, which is complicated by intricate interlacing of fine-bedding planes. Frequently seen in sawed 3033 stones, esp. where the lamination is slightly oblique or irregular. It is very like the grain of wood that shows in a planed board.
Industry:Mining
A local term used in southern Michigan for a shallow boggy depression less than 1 acre (0.4 ha) in extent, esp. one formed by a glacier in a till plain.
Industry:Mining
A local trade name for a yellowish-green variety of chalcedony from Death Valley, CA.
Industry:Mining
