El Pico Clay (TXEOep;0)

State	Texas
Name	El Pico Clay
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Eocene
Original map label	Eep
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.
Geographic coverage	Dimmit - Frio - Webb - Zavala