Saint Regis Formation  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
 ....Saint Regis Formation
RTIdaho
 Montana
 Washington
 Belt Supergroup
 Ravalli Group
SNIn Ravalli Group of Belt Supergroup. NE Idaho, NW Montana and Washington. Added to Thesaurus in 1989.