| State | Texas |
|---|---|
| Name | Santa Anna Branch Shale and Sedwick and Moran Formations, undivided |
| Geologic age | Permian; Wolfcamp Series |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)
Minor
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)
|
| 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., Sedwick Fm 30-40, Moran Fm 160-210 |
| 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.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. |
| NGMDB product | |
| Counties | Brown - Coleman - Concho - McCulloch |