A Study of the Divide-Dewey Contact of the Boulder Batholith
Francis M. Young · Digital Commons - Montana Tech (Montana Tech of the University of Montana) · 1950
The batholith is dated as Paleocene or early Eocene. The rocks of the batholith in this area are classified as ranging from quartz-granodiorite to granodiorite. Variation in mineral content causes a chance in color tone from light to dark gray. swarms of inclusions occur in the igneous rock near the contact.