Phyllitc siltstone, quartzite, and lesser amounts of limestone and dolomite (NVCAZs;0)

State	Nevada
Name	Phyllitc siltstone, quartzite, and lesser amounts of limestone and dolomite
Geologic age	Late Proterozoic to Early Cambrian
Original map label	CZs
Comments	In stratigraphic order, oldest to youngest: the Reed Dolomite is 1,560 feet thick; the Deep Spring Formation is 1,500 feet thick; the Campito Formation is 2,500(?) feet thick; the Poleta Formation is 1000+ feet thick; the Harkless Formation (including Saline Valley Formation at the top) is 3,500 feet thick; the Mule Spring Limestone is 400-500 feet thick (main part of Esmeralda County, Albers and Stewart, 1972). Often lithologically similar, these formations can be separated by their respective fossils.
Primary rock type	siltstone
Secondary rock type	limestone
Other rock types	dolostone (dolomite); quartzite; sandstone
Lithologic constituents	Major Sedimentary > Clastic > Siltstone (Bed)Includes phyllitic siltstone and incidental phyllite and hornfels of Harkless Formation (reported in Albers and Stewart, 1972). Minor Sedimentary > Carbonate > Dolostone (Bed)Almost exclusively within the Reed Dolomite with minor beds in the lower member of the Deep Springs Formation; includes silty or sandy dolomite and dolomitic sandstone, possibly some silty limestone. Sedimentary > Carbonate > Limestone (Bed) Incidental Sedimentary > Clastic > Sandstone (Bed)Rare occurrences in the Deep Springs Formation and the Poleta Formation Metamorphic > Quartzite (Greenschist)Primarily in the Andrews Mountain Member (lower) of the Campito Formation, the middle member of the Poleta Formation, and the Saline Valley Formation at the top of the Harkless Formation. Possibly 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). 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.
Geographic coverage	Esmeralda - Mineral - Nye