|Geologic age||Permian; Wolfcamp Series|
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Sedimentary > Clastic > Sandstone (Bed)
|Comments||Upper part sandst., quartz, med. to coarse grained, irreg. crossbedded, friable. Lower part shale, sandy, silty, sl. muscovitic, laminated, alternates with thin sandst. beds. Thickness in type section 5,415 ft, in meas. section west side of Ojo Bonito 2,610 ft.|
Bureau of Economic Geology, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.
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.