1. Map of normal faults and extensional folds in the Tendoy Mountains and Beaverhead Range, southwest Montana and eastern Idaho [electronic resource] Yale Public content 2001. 2002-06-01T04:00:00Z. 2003-10-26T23:05:51Z. Geological Survey (U.S.). The Survey. English. Public. Montana, Tendoy Mountains, Beaverhead County, Idaho, and Lemhi County.