Del Rio Clay

Del Rio Clay
State Texas
Name Del Rio Clay
Geologic age Late Cretaceous
Lithologic constituents
Major
Unconsolidated > Marl (Bed)
Minor
Sedimentary > Carbonate > Limestone (Bed)
Comments Calcareous to gypsiferous, nodular marl and marly limestone, pyrite common, blocky, med gray, weathers lt-gray to lt- yellowish-gray, contains lenses of calcar siltst., marine megafossils include abdt Exogyra arietina and other pelecypods; thickness as much as 200 ft in Del Rio Sheet (1977) feathers out northwestward.
References

Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.

Bureau of Economic Geology, 1977, Del Rio 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 Kinney - Uvalde - Val Verde