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Limestone, minor amounts of dolomite, shale, and sandstone; locally thick conglomerate units

LIMESTONE, MINOR AMOUNTS OF DOLOMITE, SHALE, AND SANDSTONE; LOCALLY THICK CONGLOMERATE UNITS (Lower, Middle, and Upper Triassic)-Includes Tobin, Dixie Valley, Favret, Augusta Mountain, and Cane Spring Formations and Star Peak Group in central Nevada and Grantsville and Luning Formations in west-central Nevada
StateNevada
NameLimestone, minor amounts of dolomite, shale, and sandstone; locally thick conglomerate units
Geologic ageTriassic
Original map labelTRc
CommentsThis unit also contains some of the Gabbs and Sunrise Formations (see NVJTRs) where undivided from the Luning Formation in northern Nye County (Kleinhampl and Ziony, 1985). The Luning Formation ranges from 3000 to 10,000 feet thick (Kleinhampl and Ziony, 1985, Ross, 1961). The Tobin (900 feet thick), Dixie Valley (150 to 800 feet thick), and Favret (700 feet thick) Formations are correlative with the lower and middle members of the Prida Formation (400 to 2,500 feet thick); the Augusta Formation (2,500 feet thick) is stratigraphically correlative with the upper member of the Prida and the lower member of the Natchez Formation (1,650 to 2,500 feet thick; the Cane Spring Formation (1,000 to 1,500 feet thick) is equivalent to the upper member of the Natchez (Johnson, 1977).
Primary rock typelimestone
Secondary rock typedolostone (dolomite)
Other rock typesshale; sandstone; conglomerate; siltstone; andesite; chert
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)Includes minor argillite in the Luning and Augusta Formations.
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Sedimentary > Chemical > Chert (Bed)Occurs only in upper Prida Formation of Pershing County.
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)Possibly minor in rank. Includes minor greenstone in Augusta Formation in Pershing County.
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., and McKee, E.H., 1977, Geology, Pt. 1, in Geology and Mineral Deposits of Lander County, Nevada: Nevada Bureau of Mines and Geology Bulletin 88, p. 1-59, 3 pl.
Johnson, M.G., 1977, Geology and Mineral Deposits of Pershing County, Nevada: Nevada Bureau of Mines and Geology Bulletin 89, 115 p., 4 pl.
Kleinhampl, F.J., and Ziony, J.I., 1985, Geology of Northern Nye County, Nevada: Nevada Bureau of Mines and Geology Bulletin 99A, 172 p., 2 pl.
Ross, D.C., 1961, Geology and Mineral Deposits of Mineral County, Nevada: Nevada Bureau of Mines and Geology Bulletin 58, 98 p., 2 pl.
Geographic coverageChurchill - Humboldt - Lander - Mineral - Nye - Pershing

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