Walnut Clay

Walnut Clay
State Texas
Name Walnut Clay
Geologic age Early Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Comments Clay, limestone, and shale; clay, calcareous; limestone, chalky, marly, nodular, thick bedded, a few hard beds with sparry calcite, massive beds of Texigryphaea common in lower part; shale as thin beds most common in upper part; thickness 125-175 ft.

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, 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 Bell - Bosque - Brown - Burnet - Comanche - Coryell - Erath - Hamilton - Hood - Johnson - Lampasas - McLennan - Mills - Parker - Somervell - Tarrant - Travis - Williamson