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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Council Grove Group
RTOklahoma
 Colorado
 Nebraska
 Kansas
 Cottonwood Limestone
 Eskridge Shale
 Red Eagle Limestone
 Roca Formation
 Stearns Shale
SNLower Permian. E Kansas, SE Nebraska, N Oklahoma, Colorado. In Kansas includes (ascending) Foraker Limestone, Johnson Shale, Red Eagle Limestone, Roca Formation, Grenola Limestone, Eskridge Shale, Beattie Limestone, Stearns Shale, Bader Limestone, Easly C