|Name||Skinner Ranch and Hess Formations, undivided|
|Geologic age||Permian; Wolfcamp Series|
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
|Comments||Skinner Ranch Fm--calcarenite, biohermal ls., coarsely granular, massive, thick beds of limestone-pebble conglomerate in lower part, minor amounts of interbedded yellow sandy shale, some pink-brown chert; numerous brachiopods and fusulinids; type section west knob of Leonard Mountain (11 km north of Marathon, Brewster Co.); thickness 225-1,600 ft; merges eastward with thin-bedded Hess Limestone, much of which is dolomitized; thickness 1,600-2,300 ft.|
|Stratigraphic units||Hess Limestone|
Bureau of Economic Geology, 1982, Fort Stockton Sheet, Geologic Atlas of Texas, University of Texas at Austin, scale 1:250,000.
Cooper, G.A. and Grant, R.E., 1966, Permian rock units in the Glass Mountains, west Texas: Geological Survey Bulletin 1244-E.
Cooper, G.A. and Grant, R.E., 1972, Permian brachiopods of West Texas, I., in Smithsonian Contributions to Paleobiology no. 14.
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 - Pecos|