| State | Texas |
|---|---|
| Name | Seymour Formation |
| Geologic age | Middle Pleistocene; Irvingtonian |
| Lithologic constituents | Major
Sedimentary > Clastic > Conglomerate (Bed)
|
| Comments | 1) thin deposits--sand, silty, orange-brown, massive; locally thin, granule to pebble gravel in basal part.; thin deposits 1-10 ft thick 2) thick deposits --mostly sand, silty, orange-brown to red, thick bedded, massive, locally crossbedded; minor lenses of clay containing fresh-water mollusks; well developed caliche near surface as much as 5 ft thick; basal gravel 1-15 ft thick granules to boulders. fossil vertebrates scarce. Unit contains Lava Creek B volcanic ash. thick deposits 10-75 ft thick |
| Stratigraphic units | lower part equivalent to Good Creek Formation; middle part equiv. to Groesbeck Formation; part of Paducah Group |
| 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 | Baylor - Coke - Fisher - Foard - Haskell - Jones - Knox - Nolan - Runnels - Shackelford - Taylor - Throckmorton - Wilbarger |