Missoula Group  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
 ....Missoula Group
RTIdaho
 Montana
 Belt Supergroup
 Bonner Formation
 Empire Formation
 Mount Shields Formation
 Shepard Formation
 Snowslip Formation
 Spokane Formation
SNIn Belt Supergroup. Includes numerous named formations: among these are Marsh Shale in Helena region; Striped Peak and Libby formations in NW Montana, five formations near Missoula, and others in and S of Glacier National Park. In N Idaho and NW Montana.