Lower part of Washita Group

Lower part of Washita Group
State Texas
Name Lower part of Washita Group
Geologic age Early Cretaceous; Comanchean Series
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Unconsolidated > Marl (Bed)
Comments On Dallas Sheet, Denton Clay is calcar, argillaceous ls. in upper part with abdt Gryphaea, brn-gray-yellow; thickness 3-11 ft. Fort Worth Ls is limest. and marl; ls. chalky, med. grained, farily hard, nodular, bluish-white to bluish-gray, interbedded with lt. gray marl; thickness 25-35 ft. Duck Creek Ls. is limest.and marl; ls, med bedded,nodular to wavy bedded, gray, interbedded with marly clay; more resistant than For Worth Ls; thickness 25-30 ft.
Stratigraphic units (descending) Denton Clay,Fort Worth Limestone,Duck Creek Limestone
References

Bureau of Economic Geology, 1970, Waco Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

Bureau of Economic Geology, 1972, Dallas sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.

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 Bosque - Coryell - Hamilton - Hill - McLennan