Kewanee Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Kewanee Group
RTIllinois
 Carbondale Formation
 Spoon Formation
SNIllinois. Added to Thesaurus in 1985.