|Name||Grape Creek Formation|
|Geologic age||Permian; Leonard Series|
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|Comments||Shale and limestone; mostly shale tan, gray, greenish-brown, incr. reddish northward, thick beds, local thin lentils of clayey ls. and calcar siltst. most adbt in upper part; ls mostly in lower part, tan, gray, yellow, fine to coarse grained, thin to med bedded in units 2-10 ft thick, massive, nodular, pelecypods, brachiopods, bryozoa, gastropods, and cephalopods. Thickness of unit 100-120 ft, thins northward|
|Stratigraphic units||Albany Group (revised), Wichita Group (revised)|
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.
|Counties||Baylor - Callahan - Coleman - Concho - Haskell - Runnels - Shackelford - Taylor - Throckmorton|