Limestone, dolomite, shale, and quartzite (NVOc;0)

State	Nevada
Name	Limestone, dolomite, shale, and quartzite
Geologic age	Ordovician
Original map label	Oc
Comments	The Pogonip Group, Eureka Quartzite, and Ely Springs Dolomite have a combined thickness of 3,500 to 4,700 feet thick, thinning southward, with the Pogonip ranging 60 to 85% of that, the Eureka Quartzite ranging from almost 0 to 11%, and the Ely Springs Dolomite ranging from 8 to 30% (Longwell and others, 1965, Tschanz and Pampeyan, 1970, Hose and Blake, 1976). The Eureka Quartzite is a distinctive white band compared to the dark limestone and dolostone of the other two units. The Pogonip Group is made up three members corresponding to the Goodwin Formation, the Ninemile Formation, and the Antelope Valley Limestone, lower to upper respectively; however, the Pogonip has been divided into as many as nine different members (Longwell and others, 1965, Tschanz and Pampeyan, 1970). The Ely Springs Dolomite just contains the Silurian-Ordovician boundary (hence inclusion in unit NVSOC, particularly in White Pine County) (Longwell and others, 1965, Hose and Blake, 1976). Includes "post-Dunderberg Shale" Cambrian limestone in White Pine County (Hose and Blake, 1976).
Primary rock type	limestone
Secondary rock type	dolostone (dolomite)
Other rock types	shale; quartzite; chert
Lithologic constituents	Major Sedimentary > Carbonate > Dolostone (Bed) Sedimentary > Carbonate > Limestone (Bed) Incidental Sedimentary > Chemical > Chert (Lense) Sedimentary > Clastic > Mudstone > Shale (Calcareous)Limited to Ninemile Formation of Pogonip Group. Includes argillaceous shale and possibly siltstone in Nye County. Possibly (just barely) minor in rank. Sedimentary > Carbonate > Limestone (Lense)Limited to shale unit (Ninemile Formation) of Pogonip Group. Metamorphic > QuartziteLimited to Eureka Quartzite. Possibly (just barely) minor in rank.
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. Longwell, C.R., Pampeyaan, E.H., Bowyer, B., and Roberts, R.J., 1965, Geology and Mineral Deposits of Clark County, Nevada: Nevada Bureau of Mines and Geology Bulletin 62, 218 p., 16 pl. Hose, R.K., and Blake, M.C, Jr., 1976, Geology, Pt. 1, in Geology and Mineral Resources of White Pine County, Nevada: Nevada Bureau of Mines and Geology Bulletin 85, p. 1-32, 2 pl. Coats, R.R., 1987, Geology of Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin 101, 112 p., 1 pl. Tschanz, C.M., and Pampeyan, E.H., 1970, Geology and Mineral Deposits of Lincoln County, Nevada: Nevada Bureau of Mines Bulletin 73, 187 p., 7 pl.
Geographic coverage	Clark - Elko - Esmeralda - Eureka - Lander - Lincoln - Nye - White Pine