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Data sets Publications Expeditions Thesaurus
Jefferson Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Devonian
 ....Upper Devonian
 .....Jefferson Group
RTIdaho
 Utah
 Wyoming
 Montana
 Birdbear Formation
 Duperow Formation
SNMontana, Idaho, N Utah and W Wyoming. Added to Thesaurus in 1985.