Abstract:The Townsend Valley in west-central Montana is a 600 square-mile intermontane basin bordered by the Big Belt Mountains on the east and by the Elkhorn Mountains on the west. It extends from approximately T. 4 N., to T. 11 N., inclusive. Rocks ranging in age from Precambrian to Cretaceous crop out in the mountainous areas that surround the valley, and rocks of Tertiary (Oligocene and Miocene) age crop out on the higher valley slopes and underlie the alluvial deposits in the valley bottom. The area is drained by … Show more
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