Yates Formation (TXPy;0)

State	Texas
Name	Yates Formation
Geologic age	Phanerozoic \| Paleozoic \| Permian [Guadalupe]
Original map label	Py
Comments	Siltstone, shale, limestone, and dolomite. In southern area siltstone, very fine-grained sandstone, and shale, thin to medium bedded, some thin beds of sandy limestone, dolomite, and locally redbeds; grades to limestone and dolomite northward (reefward) and in turn to Capitan Limestone, a few thin beds of siltstone, thin to thick bedded; forms light-colored moderate slope between dark-colored bluffs of adjacent formations; thickness up to 290 ft.
Primary rock type	siltstone
Secondary rock type	shale
Other rock types	limestone; dolostone (dolomite)
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Clastic > Siltstone (Bed) Minor Sedimentary > Carbonate > Dolostone (Bed) Sedimentary > Carbonate > Limestone (Bed)
Map references	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
Unit references	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.
Geographic coverage	Culberson