|Geologic age||Permian; Guadalupe Series|
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Chemical > Evaporite > Gypsum (Bed)
|Comments||Mudstone, gypsum, dolomite, and sandstone. laterally persistent dolomite beds Guthrie, Acme, and Mangam Dolomite units are 2-8 ft thick and are white, tan, yellow, clayey, fine to coarse grained, thin to med. bedded, molds of pelecypods and large ammonoids and nautiloids locally abdt in coarse-grained beds. Mudst (and shale)-- silty, in part calcar., indistinct bedding, var. shades red and gray, brownish-red green, thin lenses and discordant seams of satin spar and selenite gypsum and thin beds and nodules of alabaster gypsum common. gypsum in units 1-10 ft thick and in laminated dolomitic beds. Minor channel fill sandst mostly near base. thickness 150-175 ft in San Angelo area, 250-400 ft in Wichita Falls-Lawton area.|
|Stratigraphic units||Pease River Group, Guthrie Dolomite, Acme Dolomite, Mangum Dolomite|
Bureau of Economic Geology, 1974, San Angelo Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1987, Wichita Falls-Lawton Sheet, Geologic Atlas of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:250,000.
Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000.
|Counties||Childress - Coke - Collingsworth - Cottle - Fisher - Foard - Hall - Hardeman - Jones - King - Knox - Nolan - Stonewall - Taylor - Tom Green - Wheeler|