| State | Texas |
|---|---|
| Name | Cook Mountain Formation |
| Geologic age | Eocene |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Siltstone (Bed)
Incidental
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Coal > Lignite (Bed)
|
| Comments | clay and marly sand, argillaceous and carbonaceous sand, marl and clay, marly clay. In San Antonio Sheet clay and glauconitic sandstone, marine fossils, unit about 230 ft thick. In Seguin Sheet clay and sandstone about 200-230 ft thick. In Crystal City Sheet clay and sandstone; clay gypsiferous, sl. lignitic, sandst. v. fine grained, marine megafossils and microfossils abdt; thickness about 200-350 ft thick. |
| Stratigraphic units | (descending members) Mount Tabor, Spiller, Landrum, and Wheelock |
| References | Bureau of Economic Geology, 1976, Crystal City-Eagle Pass Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Bureau of Economic Geology, 1974, Seguin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Bureau of Economic Geology, 1967, Palestine Sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, 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 | Anderson - Angelina - Atascosa - Bastrop - Brazos - Burleson - Cherokee - Fayette - Frio - Gonzales - Houston - La Salle - Lee - Leon - Madison - Nacogdoches - Robertson - Sabine - San Augustine - Wilson |