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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Chase Group
RTOklahoma
 Nebraska
 Kansas
 Fort Riley Limestone
 Wreford Limestone
SNIncludes Odell Formation, Nolans Formation, Wreford Limestone, Matfield Shale, Doyle Shale, Winfield Limestone, Herrington Limestone, Fort Riley Limestone and Barneston Limestone. E Kansas, N central Oklahoma, and SE Nebraska.