Bulletin of the United States Geological SurveyThe Survey., 1910 - Geology |
Other editions - View all
Common terms and phrases
alaskite porphyry altered apatite Austin biotite brick Bull Bulletin 213 Bully Hill calcite Canyon carbonate cement cent chalcopyrite chlorite chromite clay coarse color Company consists contains country rock County Creek crystals depth diabase dikes diorite district east epidote fault feet thick feldspar formation Geology gneiss gold grains granite gravel gray Gulch gypsum hornblende Idaho igneous inches intrusive Iron Mountain iron-ore layers lime limestone Llano locally magnetite masses massive material mica miles Mineral Resources U. S. mining molybdenite monazite northeast northwest occur ocher oolitic orthoclase outcrop oxide Park City pegmatite peridotite phosphate beds Phosphate rock places porphyry present probably prospects pyrite quadrangle quarry quartz quartzite range region Rept ridges River rutile sand sandstone schist serpentine shaft shale shows slate slope southeast southwest stone structure sulphide surface Survey tion U. S. Geol valley veins vertical vicinity zone
Popular passages
Page 402 - The government publications, except those to which a price is affixed, can be obtained free by applying to the Director...
Page 69 - SCHRADER, FC, Mineral deposits of the Cerbat Range, Black Mountains, and Grand Wash Cliffs, Mohave County, Ariz.: Bull.
Page 178 - The constant occurrence of the chromite in rounded masses of varying proportions near the contact of the peridotite with the gneiss and its occurrence in the fresh, as well as the altered, peridotite indicate that the chromite has been held in solution in the molten mass of the peridotite when it was intruded into the country rock, and that it separated out among the first minerals as this mass began to cool.
Page 604 - ... veins." In the very large pegmatites the mica is not in general evenly distributed through the mass, but is richer in one portion than another, so that the entire bulk of the rock does not have to be removed in mining.
Page 270 - HARDER, EC Manganese deposits of the United States; with sections on foreign deposits, chemistry, and uses.
Page 400 - ... 90 per cent less than 2.1 millimeters. No particle shall be more than 5 millimeters in diameter, and the sand shall be passed through screens or sieves of such mesh as to stop all such particles, and no screen or sieve shall be used containing at any point holes or passages allowing grains larger than the above to pass. The diameters of the sand grains will be computed as the diameters of spheres of equal volumes.
Page 457 - Geological Survey, Washington, DC The priced publications may be purchased from the Superintendent of Documents, Government Printing Office, Washington, DC Those marked "Exhausted" are not available for distribution, but may be seen at the larger libraries of the country.
Page 269 - 24. List of Marine Mollusca, comprising the Quaternary fossils and recent forms from American Localities between Cape Hatteras and Cape Roque.
Page 381 - These publications, except those to which a price is affixed, can be obtained free by applying to the Director, United States Geological Survey, Washington, DC The priced publications may be purchased from the Superintendent of Documents, Government Printing Office, Washington, DC...
Page 421 - Geology and water resources of the northern portion of the Black Hills and adjoining regions in South Dakota and Wyoming. Professional Paper 65. 106pp. 1909. DARTON, NH, and SIEBENTHAL, CE Geology and mineral resources of the Laramie Basin, Wyoming; a preliminary report.