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Data sets Publications Expeditions Thesaurus
Shepard Formation  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
 ....Shepard Formation
RTMontana
 Belt Supergroup
 Missoula Group
SNIn Missoula Group of Belt Supergroup. NW Montana. Added to Thesaurus in 1989.