Dolomite (NVSc;0)

State	Nevada
Name	Dolomite
Geologic age	Silurian to Early Devonian
Original map label	Sc
Comments	The Lone Mountain Dolomite ranges from 1,570 to 3,200 feet thick. The Lone Mountain Dolomite is laterally equivalent to the Robert Mountains Formation (see unit NVSt) (Roberts and others, 1967). The Laketown Dolomite outcrops in Nye and Lincoln Counties and ranges from 0 to 1000 feet in thickness (Tschanz and Pampeyan, 1970, Kleinhampl and Ziony, 1985). In southern Elko County, there is an outcrop which consists of Fish Haven Dolomite (Ordovician--see unit NVOc and NVSOc), the Laketown Dolomite, and the Sevy Dolomite (Devonian, see unit NVDc), undifferentiated. The Sevy Dolomite also overlies the Lone Mountain Formation in Clark County and just a part of it is included in this unit (Longwell and others, 1965). Similarly, the Nevada Formation (which is almost entirely limestone and dolostone and is Devonian in age) lies stratigraphically above the Lone Mountain Dolomite in Eureka County (Roberts and others, 1967) and stratigraphically above the Laketown Dolomite in northern Nye County (Kleinhampl and Ziony, 1985); in both cases, just a part of the Nevada appears to be included in this unit.
Primary rock type	dolostone (dolomite)
Secondary rock type	limestone
Other rock types	chert; sedimentary breccia
Lithologic constituents	Major Sedimentary > Carbonate > Dolostone (Bed) Incidental Sedimentary > Chemical > Chert (Bed) Sedimentary > Clastic > Sedimentary-breccia (Bed) Sedimentary > Carbonate > Limestone (Bed)Limited to the southern Ruby Mountains of Elko County, where the majority of the Lone Mountain Formation is limestone (1,250 feet of 1,350 feet; the remaining is dolostone (Coats, 1987). Note that limestone is not reported in any other outcrops in this unit.
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. Coats, R.R., 1987, Geology of Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin 101, 112 p., 1 pl. Roberts, R.J., Montgomery, K.M., and Lehner, R.E., 1967, Geology and Mineral Resources of Eureka County, Nevada: Nevada Bureau of Mines and Geology Bulletin 64, 152 p., 12 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. 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.
Geographic coverage	Clark - Elko - Eureka - Lincoln - Nye - White Pine