|Geologic age||Permian; Wolfcamp Series|
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|Comments||Sedwick Fm--mudstone and sandstone, and several thin gray to tan limestone beds; mostly mudst. tan, poorly exposed, few flaggy siltst. and sandst. beds, lt-gray, tan, laminated, ripples, burrowed; contains two unnamed limestone beds 2-3 ft., and 4-6 ft thick respectively. One sandst. 5-15 ft. thick, crossbedded, plant fossils. Limest. fine to med grained, thin beds, sandy, clayey, fossils mostly crinoid frags. gastropods, and Myalina. Thickness of Sedwick Fm. 30-40 ft.|
|Stratigraphic units||Cisco Group, Bowie Group (new)|
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.
Plummer, F.B., and Moore, R.C., 1921, Stratigraphy of the Pennsylvanian formations of north-central Texas: University of Texas Bulletin 2132.
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||Callahan - Coleman - Eastland - Shackelford - Stephens|