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Data sets Publications Expeditions Thesaurus
Boggy Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Desmoinesian
 .......Boggy Shale
RTOklahoma
 Arkansas
 Krebs Group
SNIn Krebs Group. Oklahoma and W Arkansas. Added to Thesaurus in 1985.