|Geologic age||Late Cretaceous; Gulfian Series|
Sedimentary > Carbonate > Limestone (Bed)
Unconsolidated > Marl (Bed)
|Comments||In Ouachita tectonic belt province limestone and marl, limest. lt. yell to yell-brn and lt.gray, thick beds, in part crossbedded, fossilif.; alternates with marl, lt gray to yell; in part sandy, some volcanic rock fragments and weathered bentonite beds, scarce sandstone ledges; marine megafossils abdt; thickness as much as 500 ft.|
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, 1977, Del Rio Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Hill, R.T., and Vaughan, T.W., 1898, Geology of the Edwards Plateau and Rio Plain adjacent to Austin and San Antonio, Texas, with reference to the occurrence of underground waters: U.S. Geological Survey Annual Report 18, pt. 2, p. 193-321.
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||Bexar - Kinney - Medina - Uvalde|