Geology of a Part of the Afton Fluorite Mining District, San Bernardino County., CaliforniaStanford University, 1950 - 52 pages |
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Common terms and phrases
Afton Canyon Afton Fluorite Mining alluvium andesite breccia angular fragments arkosic basalt and weathered basalt on andesite Big Horn adit Big Horn prospect biotite boulder in coarse breccia near Old breccia near western Cady Mountains Calcite veins filled Calif California capped by Manix chlorite coarse sandstone contact of basalt Crushed tuff cut on Fluorite dips east from Big epidote erosion exposed Fanglomerate capped Fault breccia Fault contact fluorite deposits Fluorite Hill Fluorite Mining District fluorite vein fluorspar four-wheel drive GEOLOGY Gneiss Gneiss boulder granite porphyry grey Hydrothermal iron oxide lava Manix lake beds mapped area metamorphic rocks mineral deposits Miocene Mojave Desert Mojave River northeast Old Randall shaft olivine Open cut outcrops overlies phenocrysts quartz Randall shaft west rock units San Bernardino County sandstone sediments sequence of rock shear square mile steep texture thickness tuff and sandstone veinlets vesicular basalt view of andesite View showing sequence volcanic flows wall rock