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Wyman Formation

WYMAN FORMATION-Phyllite and phyllitic siltstone and minor amounts of limestone, dolomite, and sandstone
State Nevada
Name Wyman Formation
Geologic age Late Proterozoic
Comments Albers and Stewart, 1972, describe the Wyman Formation as primarily siltstone with thin limestone interbeds; the strata are somewhat metamorphosed and commonly grade to phyllite, schist, marble, and calc-silicate and siliceous hornfels. In Nevada, the Wyman Formation is 960-1350 feet thick, while in the White-Inyo Range, the Formation is 9,000+ feet thick; in neither location is the base exposed.
Primary rock type siltstone
Secondary rock type limestone
Other rock types sandstone; dolostone (dolomite)
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)Includes phyllitc siltstone, silty claystone, and limy siltstone.
Minor
Sedimentary > Carbonate > Limestone (Bed)Includes sandy limestone.
Incidental
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Map references
Stewart, J.H., and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey and Nevada Bureau of Mines and Geology, 1:500,000 (not part of any formal series, printed and distributed by the U.S. Geological Survey, G75163, reprinted, 1981, G81386).
Unit references
Stewart, J.H., and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey and Nevada Bureau of Mines and Geology, 1:500,000 (not part of any formal series, printed and distributed by the U.S. Geological Survey, G75163, reprinted, 1981, G81386).
Stewart, J. H., 1980, Geology of Nevada: A discussion to accompany the Geologic Map of Nevada: Nevada Bureau of Mines and Geology Special Publication 4.
Albers, J.P., and Stewart, J.H., 1972, Geology and Mineral Deposits of Esmeralda County, Nevada: Nevada Bureau of Mines and Geology, 80 p., 2 pl.
Counties Esmeralda - Nye