Allegheny Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Allegheny Group
UFAlleghanian
 Alleghenian
RTVirginia
 Kentucky
 Ohio
 Pennsylvania
 Maryland
 West Virginia
 Freeport Formation
 Kittanning Formation
SNSubdivided into three formations: Clarion, Kittanning, and Freeport. E Kentucky, W Maryland, E Ohio, W Pennsylvania, W Virginia, and West Virginia. Above Pottsville Group; below Conemaugh Group.