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Santa Anna Branch Shale

Santa Anna Branch Shale
State Texas
Name Santa Anna Branch Shale
Geologic age Phanerozoic | Paleozoic | Permian [Wolfcamp]
Comments Mudstone, shale, and sandstone. Mostly mudst. and shale, gray, tan, maroon, thick beds, colors intertongue locally; a few thin ss lentils and sheets, v fine grained, calcar. Limestone lt-gray, fine-grained, thin bedded, nodular, weathers to hard slabs and blocks, thickness 1-3 ft. Sandst. brown, med-grained, large-scale crossbeds thickness 8-10 ft. Thickness of Santa Anna Branch Shale 170-190 ft.
Primary rock type mudstone
Secondary rock type shale
Other rock types sandstone; limestone
Lithologic constituents
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Limestone (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.
Counties Callahan - Coleman - Shackelford - Throckmorton