|Geologic age||Early and Middle Silurian|
Sedimentary > Carbonate > Dolostone (Bed)some dolomitic limestone present
Sedimentary > Carbonate > Limestone (Bed)
|Comments||(from Van Horn-El Paso Sheet, 1968) Dolomite, dolomitic limestone, and locally limestone, aphanitic to coarse grained, thick to very thick bedded, massive, white to lt. gray, some beds medium dk. gray; marine fossils in a few ls. beds. Thickness--Frinklin Mountains, 600-900+ ft; Hueco Mtns. 630+ ft; Sierra Diablo and Baylor Mtns, 300-450 ft (from Richardson, 1908) outcrops in El Paso Co. in Orogrande Basin. Massive whitish magneisum limestone approx. 1,000 ft thick. Overlies Montoya Limestone. Fossils generally scarce throughout formation, but at a few horizons are vey abundant. Most common is species of radially plicated pentameroid shell which, with Amplexus and Favosites proves that the upper Niagaran stage is represented.|
Bureau of Economic Geology, 1968, Van Horn-El Paso Sheet, Geologic Atlas of Texas: Bureau of Economic Geology, The University of Texas at Austin, scale 1:250,000.
Richardson, G.B., 1908, Paleozoic formations in Trans-Pecos Texas: American Journal of Science, 4th series, v. 25, art. 49, p. 474-484.
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||Culberson - El Paso - Hudspeth|