The Green Schists and Associated Granites and Porphyries of Rhode Island, Ausgaben 311-315U.S. Government Printing Office, 1907 - 74 Seiten |
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abundance Alaska aplite auriferous basin bed rock bench biotite bowlders Bull Bulletin calcite canyon Carboniferous cent chalcopyrite chloride clay cm³ coal coarse color conglomerate consists contains copper County crystals cubic cupric sulphate deposits depth diabase dike diorite district ditch drills east epidote feet thick feldspar Fork Geological Survey geology Glacier gold grains grams granite gravels hornblende inches Island joints Kougarok lime limestone magnetite mass Matanuska mica microcline microgranite miles mineral resources mining Mountain mouth Nome occur oligoclase operations orthoclase oxide pay streak pegmatite places porphyry potash feldspar probably pyrite quadrangle quarry quartzite reconnaissance region reported Rept rift Rock structure sand schist seams Seward Peninsula shale sheets shows silicates silver Snake River soda-lime feldspar solution specimen stone stream surface texture tion tributary tunnel U. S. Geol upper valley vein vertical Vinalhaven Yukon