| State | Texas |
|---|---|
| Name | Frio Clay |
| Geologic age | Oligocene |
| Lithologic constituents | Major
Unconsolidated > Fine-detrital > Clay
|
| Comments | clay, dark greenish-gray, massive, some gypsum and calcareous concretions; thickness about 200 ft feathers out northward on Crystal City-Eagle Pass Sheet (1976). |
| 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, 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 | Duval - Live Oak - McMullen - Webb |