El Picacho Formation

El Picacho Formation
State Texas
Name El Picacho Formation
Geologic age Late Cretaceous
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Claystone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Coal > Lignite (Bed)
Comments Claystone, sandstone, and lignite; upper part claystone and a few yell-gray sandst. beds; middle part sandstone, forms ledges; about 175 ft thick. lower part claystone alternations of bright purple, gray, pink, white capped by carbonaceous clay and lignite, thickness about 250 ft; thickness of El Picacho Fm 825 ft.
References

Bureau of Economic Geology, 1979, Marfa Sheet, Geologic Atlas of Texas: Bureau of Economic Geology and The University of Texas at Austin, 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 Presidio