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abundant altered Amargosa andesite appears associated bands basalt Belted biotite Cactus calcite Cambrian rocks Camp Canyon color common composed considerable contains contemporaneous covered crystals deposits described developed diameter dikes diorite earlier rhyolite early east exposed facies faults feet feldspar flow folding formation formed fragments Geol GEOLOGY glassy gold Goldfield grains granite gravels gray groundmass hills hornblende igneous rocks inch indicates joints late later lava less limestone limonite locally mapped mass Mesa microscope miles minerals mining monzonite Mountain occur older origin orthoclase Paleozoic parallel Peak pebbles pegmatite phenocrysts places plagioclase playa Pleistocene porphyry portion post-Jurassic present probably prospects pyrite quartz veins quartzite Range rhyolite ridge rocks sericite shale shows side Siebert lake beds silicified silver similar slightly slopes southern Spring Spurr stained strike surface Survey Tertiary thick thin titanite usually Valley wide
Seite vi - WS 164. . Underground waters of Tennessee and Kentucky west of Tennessee River and of an adjacent area in Illinois, by LC Glenn.
Seite vi - Veatch. 1907. —pp., 26 pis. B 308. A geologic reconnaissance in southwestern Nevada and eastern California, by SH Ball. 1907. 218 pp., 3 pis.
Seite 41 - The climate must have been moist and the presence of fossilized wood in the lake beds shows that trees flourished near its shores. While the lake was thus for the most part fresh, periods of aridity alternated with those of comparative humidity, and the lake or portions of it were partially desiccated, permitting the local precipitation of limestone, gypsum, and boron minerals.
Seite iii - Graton, with notes on the Dahlonega mines, by W. Lindgren. 1906. 134 pp., 9 pis. B 294. Zinc and lead deposits of the upper Mississippi Valley, by H. Foster Bain. 1906.
Seite i - Systematic geology and paleontology; D, Petrography and mineralogy; E, Chemistry and physics; F, Geography; G, Miscellaneous; H, Forestry; I, Irrigation; J, Water storage; K, Pumping water; L, Quality of water; M, General hydrographic investigations...
Seite vi - B 287. The Juneau gold belt, Alaska, by AC Spencer, and a reconnaissance of Admiralty Island, Alaska, by CW Wright.
Seite 41 - ... was probably during this general period that the most important ore deposits in the Tertiary rocks were formed, presumably by waters heated by the still-hot magmas. Between the outflow of the rhyolite and the formation of the Pahute Lake erosion was probably continuous, partially accounting for the formation of the lake basin which in the main, however, originated through orogenic sinking that was possibly, in part, consequent on adjustments due to the extrusion of immense bodies of lava, a hypothesis...
Seite 16 - Preliminary account of Goldfield, Bullfrog, and other mining districts in southern Nevada, by FL Ransome, with notes on the Manhattan district, by GH Garrey and WH Emmons.
Seite i - The classes numbered 2, 7, and 8 are sold at cost of publication; the others are distributed free. A circular giving complete lists can be had on application. Most of the above publications can be obtained or consulted in the following ways: 1. A limited number are delivered to the Director of the Survey, from whom they can be obtained, free of charge (except classes 2, 7, and 8), on application. 2. A certain number are delivered to Senators and Representatives in Congress for distribution. 3. Other...