Frio Clay

Frio Clay
State Texas
Name Frio Clay
Geologic age Oligocene
Lithologic constituents
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).

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