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Edwards and Comanche Peak Limestones, undivided

Edwards and Comanche Peak Limestones, undivided
State Texas
Name Edwards and Comanche Peak Limestones, undivided
Geologic age Phanerozoic | Mesozoic | Cretaceous-Early
Comments Edwards Limstone, limestone, dolostone, and chert. limest. aphanitic to fine grained, massive to thin bedded, hard, brittle, in part rudistid biostromes, much miliolid biospartie; dolostone fine to v. fine grained, porous, med gray to grayish brown; chert, nodules and plates common. 60-350 ft thick, thins northward. Comanche Peak Limestone fine to v. fine grained, fairly hard, nodular, lt. gray weathers white, extensively burrowed. Thickness as much as 80 ft.
Primary rock type limestone
Secondary rock type dolostone (dolomite)
Other rock types chert
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Sedimentary > Chemical > Chert (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, 1974, Austin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.
Counties Bell - Travis - Williamson