| State | Texas |
|---|---|
| Name | Bigford Formation |
| Geologic age | Eocene |
| Lithologic constituents |
Major
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)
|
| Comments | siltstone, sandstone, and clay; thickness 50-200 ft. |
| References | Bureau of Economic Geology, 1974, San Antonio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.Eargle, D.H., 1968, Nomenclature of formations of Claiborne Group, Middle Eocene, coastal plain of Texas: U.S. Geological Survey Bulletin 1251-D.https://pubs.er.usgs.gov/publication/b1251D 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 | Dimmit - Frio - Maverick - Webb - Zavala |