Del Rio Clay (TXKdr;0)

State	Texas
Name	Del Rio Clay
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous-Late
Original map label	Kdr
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.
Primary rock type	mudstone
Secondary rock type	limestone
Other rock types
Lithologic constituents	Major Unconsolidated > Marl (Bed) Minor 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, 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.
Geographic coverage	Kinney - Uvalde - Val Verde