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El Pico Clay

El Pico Clay
State Texas
Name El Pico Clay
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Comments clay, sandstone, and coal; mostly clay, in part gypsiferous, med. gray to brown; sandstone mostly fine grained, argillaceous, silty, gray to brn, thin beds to massive, friable to indurated; lower 100 ft crops out within San Antonio Sheet (1974), 700-900 ft thick in Crystal City-Eagle Pass Sheet (1976).
Primary rock type clay or mud
Secondary rock type sandstone
Other rock types coal
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Coal > Lignite (Bed)
Map references
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
Unit references
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, 1976, Crystal City-Eagle Pass Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Counties Dimmit - Frio - Webb - Zavala