Phosphoria Formation and Related Rocks

(Thrust Belt) - Upper part is dark- to light-gray chert and shale with black shale and phosphorite at top; lower part is black shale, phosphorite, and cherty dolomite. (North Wyoming) - Brown sandstone and dolomite, cherty phosphatic and glauconitic dolomite, phosphatic sandstone and dolomite, and greenish-gray to black shale. Intertonguing equivalents of parts of Phosphoria are Park City Formation (primarily cherty dolomite, limestone, and phosphatic gray shale) and Shedhorn Sandstone.
State Wyoming
Name Phosphoria Formation and Related Rocks
Geologic age Permian
Lithologic constituents
Sedimentary > Carbonate > Dolostone (Glauconitic)in part glauconitic
Sedimentary > Clastic > Mudstone > Shale > Black-shale
Sedimentary > Clastic > Sandstone
Sedimentary > Chemical > Phosphorite
Sedimentary > Chemical > Chert
Sedimentary > Carbonate > Limestone
NGMDB product
Counties Fremont - Hot Springs - Lincoln - Natrona - Sublette - Teton - Washakie