Stratigraphy of Mid-Cretaceous Blackleaf and Lower part of the frontier formations in parts of Beaverhead and Madison counties, Montana description of Albian and Cenomanian to Turonian strata in Blacktail, Snowerest, Tendoy, and Gravelly Ranges, and Pioneer and McCartney Mountains, Southwest Montana - Dyman, Thaddeus S.; Nichols, Douglas J. (U.S. Gov. Pr. Office, 1988)