El Picacho Formation (TXKpi;0)

State	Texas
Name	El Picacho Formation
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kpi
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.
Primary rock type	claystone
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, 1979, Marfa Sheet, Geologic Atlas of Texas: Bureau of Economic Geology and The University of Texas at Austin, scale 1:250,000.
Geographic coverage	Presidio