| State | Texas |
|---|---|
| Name | Washita Group |
| Geologic age | Early and Late Cretaceous; Comanchean Series |
| Lithologic constituents | Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)
|
| Comments | Washita Group--alternating thick clay units and thin limestone units; clay, calcar, commonly sandy, dk bluish gray and black; limestone in lower part hard, bluish gray to shtie, in upper part soft, thickbedded; marine megafossils; thickness 200 ft. |
| References | Bureau of Economic Geology, 1966, Texarkana Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Bureau of Economic Geology, 1976, Hobbs 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 | Brewster - Crockett - Jeff Davis - Pecos - Reeves - Upton |