The stratigraphic column in the Confusion Range extends from Ordovician(?) through Triassic. Mississippian and Pennsylvanian strata were studied in detail and one composite section was diagrammed.

Slightly more than 6,000 feet of Devonian strata were recognized. They consist for the most part of massive, black limestone beds containing an Upper Devonian fauna. The massive limestone beds are overlain by shaly limestone beds that contain a Cyrtospirifer fauna.

The Mississippian system is represented by only 260 feet of strata, assigned to the Midridge formation, that appear to be correlative with some part of the Mission Canyon formation of Montana. No rocks of Burlington, Keokuk, Meramec, and Chester ages were found in the area.

The Pennsylvanian system consists of slightly more than 3,700 feet of sediments that contain an abundant, well preserved fauna of Morrow age. The Pennsylvanian sediments are cyclic and are interpreted to indicate gradual submergence of the area. Beds in the lower part of the Morrow sequence have heretofore been assigned to the Mississippian.