San Angelo Formation (TXPsa;0)

State	Texas
Name	San Angelo Formation
Geologic age	Phanerozoic \| Paleozoic \| Permian [Guadalupe]
Original map label	Psa
Comments	Mudstone, sandstone, siltstone, and gypsum. mostly mudst and siltst, brownish-red and lt-gray, thin lenses of satin spar gypsum and alabaster gypsum nodules, thin dolomite beds and barite nodules near top; also minor sandst as channel-fill bodies and thin sheets. Lower part (Duncan Member) mostly sandst. with silica, calcite,and gypsum cement. Thickness of San Angelo Fm 90-120 ft
Primary rock type	mudstone
Secondary rock type	siltstone
Other rock types	evaporite
Lithologic constituents	Major Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed) Incidental Sedimentary > Chemical > Evaporite > Gypsum (Bed) Sedimentary > Carbonate > Dolostone (Bed)
Map references	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
Unit references	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.
Geographic coverage	Coke - Fisher - Foard - Hardeman - Haskell - Jones - King - Knox - Nolan - Runnels - Stonewall - Taylor - Tom Green - Wilbarger