Chert, shale, phosphorite, and carbonates; Permian restricted marine epicontinental-basin deposits; southeastern Idaho (IDP;0)

State	Idaho
Name	Chert, shale, phosphorite, and carbonates; Permian restricted marine epicontinental-basin deposits; southeastern Idaho
Geologic age	Permian
Original map label	P; Ps; DSc
Comments	The Phosphoria and Park City Formations are intertonguing equivalents, and are phosphatic in-part. They were deposited in a semi-restricted marine basin, on the Permian western margin of the North American Craton, at a Permian latitude of 5 to 20 degrees N (Piper, 2001).The Shedhorn Sandstone intertongues with the Phosphoria and Park City Fms in east-central Idaho, north of the Snake River Plain.
Primary rock type	chert
Secondary rock type	shale
Other rock types	phosphorite; dolostone (dolomite); arenite; limestone
Lithologic constituents	Major Sedimentary > Clastic > Sandstone > Arenite (Bed)phosphatic sandstone Sedimentary > Chemical > Chert (Bed)Rex Chert, and chert in Shedhorn sandstone Minor Sedimentary > Carbonate > Dolostone (Bed)phosphatic dolostone Sedimentary > Chemical > Phosphorite (Bed)phosphorite, phosphatic shale and carbonate Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)metalliferous, phosphatic black shale Incidental Sedimentary > Chemical > Phosphorite (Bed)phosphatic shale Sedimentary > Carbonate > Limestone (Bed)phosphatic limestone
Map references	Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Unit references	Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000. Oriel, S.S., and Platt, L.B., 1980, Geologic map of the Preston 1o x 2o quadrangle, southeastern Idaho and western Wyoming: U.S. Geological Survey Miscellaneous Investigations Series, Map I-1127, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1127] Isaacson, P.E., 1983, Stratigraphic correlation of the Paleozoic and Mesozoic rocks of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Information Circular 37. McKelvey, V.E., Williams, J.S., Sheldon, R.P., Cressman, E.R., Cheney, T.M., and Swanson, R.W., 1959, The Phosphoria, Park City, and Shedhorn Formations in the Western Phosphate Feld: U.S. Geological Survey Professional Paper 313-A, 47 p. [http://pubs.er.usgs.gov/publication/pp313A] Piper, D.Z., 2001, Marine chemistry of the Permian Phosphoria Formation and Basin, southeast Idaho: Economic Geology, v. 96, no. 3, p. 599-620 Rember, W.C., and Bennett, E.H., 1979, Geologic map of the Twin Falls quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Twin Falls 2o quadrangle, scale 1:250,000.
Geographic coverage	Bear Lake - Bingham - Bonneville - Butte - Caribou - Cassia - Clark - Custer - Fremont - Lemhi - Madison - Teton