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Shale, mudstone, siltstone, sandstone, and carbonate rock; sparse volcanic rock

SHALE, MUDSTONE, SILTSTONE, SANDSTONE, AND CARBONATE ROCK; SPARSE VOLCANIC ROCK (Upper Triassic and Lower Jurassic)-Includes Auld Lang Syne Group, Nightingale sequence of Bonham (1969), and Gabbs and Sunrise Formations
StateNevada
NameShale, mudstone, siltstone, sandstone, and carbonate rock; sparse volcanic rock
Geologic ageLate Triassic to Early Jurassic
Original map labelJTRs
CommentsIn Humboldt and Pershing Counties, good portions of this unit have been metamorphosed to argillite, phyllite, quartzite, slate, and hornfels, schist, and gneissic rocks near intrusions (Willden, 1964, Johnson, 1977). The Nightingale Formation also includes some marble (Bonham, 1969). In Churchill County, this unit ranges from 5,000 to 20,000 feet thick (Willden and Speed, 1974); of the Auld Lang Syne Group, the Raspberry Formation ranges from 3,000 to 8,000 feet thick, the Winnemucca Formation ranges from 1,000 to 3,000 feet thick, the Grass Valley Formation ranges from 300 to 2,000 feet thick, the Dun Glen Formation is 1,150 feet thick, and the Osobb Formation is 1,800 feet thick (Willden, 1964, Johnson, 1977).
Primary rock typeclaystone
Secondary rock typeshale
Other rock typessandstone; siltstone; carbonate; volcanic rock (aphanitic); conglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)Rare; associated with unnamed limestone in Humboldt County (Willden, 1964).
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Igneous > Volcanic (Bed)Limited to rare occurrences in the Raspberry Formation in Humboldt County (Willden, 1964).
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).
Willden, R., 1964, Geology and Mineral Deposits of Humboldt County, Nevada: Nevada Bureau of Mines and Geology Bulletin 59, 154 p., 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.
Bonham, H.F., 1969, Geology and Mineral Deposits of Washoe and Storey Counties, Nevada: Nevada Bureau of Mines and Geology Bulletin 70, 140 p., 6 pls.
Willden, R., and Speed, R.C., 1974, Geology and Mineral Deposits of Churchill County, Nevada: Nevada Bureau of Mines and Geology Bulletin 83, 95 p., 5 pl.
Ludington, Steve, McKee, E.H., Cox, D.P., Moring, B.C., and Leonard,K.W., 1996, Pre-Tertiary geology of Nevada, in Singer, D.A., ed., An analysis of Nevada's metal-bearing mineral resources: Nevada Bureau of Mines and Geology Open-File Report 96-2, Chapter 4, p.4.1-4.17, 1 sheet, scale 1:1,000,000. (Also available at: www.nbmg.unr.edu/ofr962.)
Geographic coverageChurchill - Humboldt - Lander - Mineral - Nye - Pershing - Washoe

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