Cibolo Formation

Cibolo Formation
State Texas
Name Cibolo Formation
Geologic age Permian; Leonard Series
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Comments (description fr. Emory Peak-Presidio Sheet) in type section fr top down: ls, dolomitic, upper part massive, lower part thinly bedded, porous, vuggy; ls and some shale, some chert; ls, sh, and ss, chert layers common, sh sandy, laminted, massive, either a breccia or conglo with rd clasts or bldrs up to 6 ft in size; shale, marly, contains sdy lenses; thickness of formation about 1,450 ft, 494 ft measured at confluence of Cibolo and Sierra Alta Crks.
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