|Geologic age||Permian; Guadalupe Series|
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
|Comments||Limestone and sandstone, three units not separately mapped--Tansill Formation, Yates Formation, and Seven Rivers Formation. Limestone, mostly dolomitic, in part pisolitic, thin bedded, light gray to white becoming varicolored northwestward (shelfward). Some quartz sandstone, fine grained, thin bedded, gray; proportion increases northwestward, becoming somewhat shaly, brownish yellow and red. Grades to massive Capitan Formation southeastward (reefward). Thickness up to 1,000 ft.|
|Stratigraphic units||Tansill, Yates, Seven Rivers Formations|
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.
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 - Hudspeth|