Carbondale Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Carbondale Formation
RTKentucky
 Illinois
 Herrin Coal Member
 Kewanee Group
 Springfield Coal Member
SNIn Kewanee Group. Illinois and W Kentucky.