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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...lower Paleozoic
 ....Glenarm Series
RTVirginia
 Pennsylvania
 Maryland
 New Jersey
 Wissahickon Formation
SNIncludes Wakefield Marble, Silver Run Limestone, Ijamsville Phyllite, Urbana Phyllite, Marburg Schist, Setters Quartzite, Cockeysville Marble, Wissahickon Formation, Peters Creek Schist, Cardiff Conglomerate, Peach Bottom Slate. Lower Paleozoic (?).