Argillaceous limestone, chert, and shale (NVDt;0)

State	Nevada
Name	Argillaceous limestone, chert, and shale
Geologic age	Devonian
Original map label	Dt
Comments	Coats, 1987, includes calcareous siltstone in Elko County. In Eureka County, the few occurances include sandy and calcareous shale and sandstone. In general, these Devonian rocks are considered transitional because they contain more limestone and less chert than rocks of the siliceous western assemblage (Roberts and others, 1967).
Primary rock type	limestone
Secondary rock type	shale
Other rock types	chert; siltstone; sandstone
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Bed) Incidental Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (Bed)Also calcareous. Possibly minor in rank. Sedimentary > Chemical > Chert (Lense) Sedimentary > Clastic > Mudstone > Shale (Bed)Includes sandy and calcareous shale. 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). 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. 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. Lovejoy, D.W., 1959, Overthrust Ordovician and the Nannie's Peak Intrusive, Lone Mountain, Elko County, Nevada: Geological Society of America Bulletin, v. 70, no. 5, p. 539-563.
Geographic coverage	Elko - Eureka