|Geologic age||Late Cretaceous|
Unconsolidated > Fine-detrital > Clay (Bed)
Sedimentary > Coal > Lignite (Bed)
Sedimentary > Clastic > Sandstone (Bed)
|Comments||Clay, sandstone, and lignite. Upper--continental deposits up to 880 ft thick. Argillaceous sandstone crossbedded. clay in part calcar.; freshwater limestone scarce; a few lignite beds. Vertebrate fossils and petrified wood common. Lower part transition down to marine beds. thickness 175 - 500+ ft. Exposed in Bofecillos area, Big Bend N.P.|
Bureau of Economic Geology, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.
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.
|Counties||Brewster - Culberson|