Alta Formation

Alta Formation
State Texas
Name Alta Formation
Geologic age Permian; Wolfcamp Series
Lithologic constituents
Major
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.
References

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.

NGMDB product
Counties Presidio