Santa Anna Branch Shale and Sedwick and Moran Formations, undivided

Santa Anna Branch Shale and Sedwick and Moran Formations, undivided
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