Chinle Formation and associated rocks (NVTRch;0)

State	Nevada
Name	Chinle Formation and associated rocks
Geologic age	Late Triassic
Original map label	TRch
Comments	Primarily located in Clark County and southern Lincoln County; one outcrop in Elko County which could be correlative with the Chinle Formation as well as the Timothy Sandstone and Nugget Sandstone. The measured thickness of the Chinle Formation ranges from 750 to 3,300 feet (Longwell and others, 1965). The relative abundances of shale, siltsone, and sandstone are unspecified in referenced literture; the ranking of each of these units is speculative.
Primary rock type	claystone
Secondary rock type	siltstone
Other rock types	sandstone; gypsum; conglomerate; limestone
Lithologic constituents	Major Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Mudstone > Claystone (Bed)Includes bentonite. Minor Sedimentary > Clastic > Sandstone (Bed)Possibly close to major in rank. Incidental Sedimentary > Carbonate > Limestone (Lense) Sedimentary > Clastic > Conglomerate (Bed)Present only in basal Shinarump Member (Longwell and others, 1965). Sedimentary > Chemical > Evaporite > Gypsum (Bed)
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). 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. 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 - Lincoln