Middle Pennsylvanian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
NTAllegheny Group
 Atokan
 Breathitt Formation
 Carbondale Formation
 Desmoinesian
 Dugger Formation
 Hermosa Formation
 Kanawha Formation
 Kewanee Group
 Manakacha Formation
 Paradox Member
 Petersburg Formation
 Spoon Formation
 Staunton Formation
 Tradewater Formation
RTUpper Pennsylvanian
 Lower Pennsylvanian