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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Dunkard Group
RTPermian
 Pennsylvanian
 Ohio
 Pennsylvania
 Maryland
 West Virginia
SNPennsylvanian and Permian. Includes Washington and Greene formations. W Maryland, E Ohio, SW Pennsylvania, and N West Virginia. Indexed with ages as applicable.