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Data sets Publications Expeditions Thesaurus
Spokane Formation  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
 ....Spokane Formation
RTMontana
 Belt Supergroup
 Missoula Group
SNIn Missoula Group. S central and W Montana. Added to Thesaurus in 1985.