Professional Paper - United States Geological Survey, Ausgabe 12The Survey, 1903 |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
abundant Alice Apache group Apache Mountains aphanitic apparently Arizona Barnes Peak basalt Basin beds biotite Black Warrior block Bloody Tanks breccia Buffalo Carboniferous chalcocite chalcopyrite chrysocolla copper crystalline cuprite dacite deposit detritus Devonian diabase dikes diorite diorite-porphyry district Dripping Spring quartzite east erosion eruptive exposed facies feet feldspar fissure foot wall fragments Gila conglomerate Gila formation Globe limestone Globe quadrangle Gold Gulch granite granitite gray grits groundmass hanging wall inclosed latter Madera diorite malachite mass microcline microscope miles Mineral Creek mineralogical mines north of Globe northeast northwest occurs Old Dominion fault oligoclase original orthoclase oxidized phenocrysts Pinal Mountains Pinal Range Pinal schists Pinto Creek Pioneer shale plagioclase postdacite pre-Cambrian probably pyrite quartz quartz-mica-diorite quartzite ranch region ridges Scanlan conglomerate schists Schultze granite shaft shown shows sills slopes southeast southwest strata structure sulphide surface texture thickness tuff tunnel unconformity usually vein Whitetail formation
Beliebte Passagen
Seite 151 - The serial publications of the United States Geological Survey consist of ( 1 ) Annual Reports, (2) Monographs, (3) Professional Papers, (4) Bulletins, (5) Mineral Resources, (6) Water-Supply and Irrigation Papers, (7) Topographic Atlas of United States — folios and separate sheets thereof, (8) Geologic Atlas of the United States — folios thereof.
Seite 151 - B 46. Nature and origin of deposits of phosphate of lime, by RAF Penrose, jr., with introduction by NS Shaler. 1888.
Seite 151 - Papers treatof a variety of subjects, and the total number issued is large. They have therefore been classified into the following series: A, Economic geology; B, Descriptive geology; C, Systematic geology and paleontology; D, Petrography and mineralogy; E, Chemistry and physics; F, Geography; G, Miscellaneous...
Seite 121 - ... scrutiny of the inclosed grains of pyrite discovers the fact that their outlines are rounded and that the chalcocite has a more or less distinct concentric, shelly structure around each grain. These facts at least strongly suggest that the chalcocite has been formed at the expense of the pyrite and that the minute structure observable in chalcocite now free from pyrite records the former presence of that mineral and its subsequent replacement by the sulphide of copper. Much of the material which...
Seite 152 - B 159. The geology of eastern Berkshire County, Massachusetts, by BK Emerson. 1899. 139 pp., 9 pis.
Seite 152 - Price 15 cents. 164. Reconnaissance in the Rio Grande Coal Fields of Texas, by Thomas Wayland Vaughan, including a Report on Igneous Rocks from the San Carlos Coal Field, by ECE Lord.
Seite 15 - It is an important factor in the evidence upon which rest the deductions concerning the great erosion of this country. Fifty or sixty miles south of the river rise the San Francisco Mountains. They are all volcanoes, and four of them are of large dimensions. The largest, San Francisco Mountain, nearly 13,000 feet high, might be classed among the largest volcanic piles of the west. Around these four masses are scattered many cones, and the lavas which emanated from them have sheeted over a large area.
Seite 152 - Glaciation of the Yellowstone Valley north of the Park, by WH Weed. 1893. 41 pp., 4 pis. B 108. A geological reconnaissance in central Washington, by IC Russell.
Seite 14 - Low mesas gently rolling and usually clad with an ample growth of pine, pifion and cedar ; broad and shallow valleys, yellow with sand or gray with sage, repeat themselves over the entire area. The altitude is greater than the plateaus north of the chasm except the Kaibab, being on an average not far from 7,000 to 7,500 feet.
Seite 85 - Within most of the larger diabase areas occur occasional masses of a reddish, usually rather coarsely crystalline rock, consisting of red feldspar, ragged prisms of dark amphibole, and a little iron ore. This rock disintegrates readily, and its field relation to the normal diabase is not easily made out, although it seems to occur as segregations from the diabasic magma. Under the microscope the rock is rather decomposed, but it is seen that the dominant feldspar is turbid orthoclase or microcline,...