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undivided part of Washita Group

undivided part of Washita Group
State Texas
Name undivided part of Washita Group
Geologic age Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]
Comments Thick clay units and thin limestone units; thickness 200 ft. Clayst., mudst., and sandst. Aphanitic limest. forms ledge, marine megafossils, alternating clay, marl, and limestone.
Primary rock type clay or mud
Secondary rock type limestone
Other rock types mudstone
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Minor
Unconsolidated > Marl (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, 1972, Dallas sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Counties Bosque - Erath - Hill - Johnson - McLennan - Parker - Somervell