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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Devonian
 ....Genesee Group
RTVirginia
 Pennsylvania
 New York
 Maryland
 West Virginia
SNMiddle and Upper Devonian. Comprises Geneseo Shale with Genundewa Limestone Lentil, Standish Flagstone, and West River Shale, Penn Yan Shale, Sherburne Flagstone, Renwick Shale, Ithaca Member. Maryland, New York, Pennsylvania, western Virginia and norther