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Data sets Publications Expeditions Thesaurus
Sturgis Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Upper Pennsylvanian
 ......Sturgis Formation
RTKentucky
SNW central Kentucky. Added to Thesaurus in 1985.