- 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 fossil resinous secretion that may be isolated from coal. It was presumably deposited in a resin duct by a secretory epithelium.
Industry:Mining
A fossil that is not native to the rock in which it is found, e.g., a fossil found as a pebble in a conglomerate.
Industry:Mining
A fossil that, because of its wide geographic distribution and restricted time range, can be used to identify and date the strata in which it occurs. Compare: guide fossil.
Industry:Mining
A fossil, usually a single species or a genus, that is restricted to a defined stratigraphic facies or is adapted to life in a restricted environment. It prefers certain ecologic surroundings and may exist in them from place to place with little change for long periods of time.
Industry:Mining
A fossiliferous limestone occurring in a variety of colors. It takes a high polish, is used as a marble, and derives its name from its most characteristic fossil, a species of coral.
Industry:Mining
A foundation that is carried down to the solid rock. The rock is cut and dressed level, loose and decayed portions are removed, and holes filled with concrete. The crushing strength of the rock can be ascertained by tests and the bearing pressure should not exceed one-eighth of the value.
Industry:Mining
A four-index type of Miller indices, useful but not necessary in order to define planes in crystal lattices in the hexagonal system; the symbols are hkil, in which i = -(h + k). Compare: Miller indices.
Industry:Mining
A four-sided plane figure of any shape, having an area equal to the product of the diagonals multiplied by half the sine of the angle between them.
Industry:Mining
A fourth of a normal section of the U.S. Public Land Survey system, representing a piece of land normally 1/2 mile (0.8 km) square and containing 160 acres (64 ha) nearly as possible. It is usually identified as the northeast, northwest, southeast, or southwest quarter of a particular section.
Industry:Mining
