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BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Comanchean
 .....Washita Group
RTLower Cretaceous
 Upper Cretaceous
 Louisiana
 Oklahoma
 Texas
 Arkansas
 Buda Limestone
 Georgetown Formation
SNLower and Upper Cretaceous. In Oklahoma, includes (ascending) Duck Creek Formation, Fort Worth Limestone, Denton Clay, Weno Clay, Pawpaw Formation, Main Street Limestone, and Grayson Shale. SW Arkansas, NW Louisiana, S Oklahoma, and Texas. Indexed with Lo