Date of Award
Master of Science
Geological and Environmental Sciences
Dr. Christopher J. Schmidt
Dr. W. Thomas Straw
Dr. William B. Harrison III
Masters Thesis-Open Access
The Late Cretaceous-Early Tertiary Laramide orogeny was responsible for the northward tilting of the pre-Eocene rocks of the area. The Late Cretaceous deposition of the Elkhorn Mountains Volcanics resulted in the volcanic-Madison Group unconformity. Late Cretaceous faulting took place probably in response to caldera subsidence. Laramide uplift erosion and downstream transport resulted in the deposition of the Conrow Creek conglomerate and debris flows over the Lodgepole Limestone. Block faulting took place in response to regional extension probably during Late Oligocene-Early Miocene time resulting in the formation of the St. Paul's Gulch, Golden Sunlight, and Boulder basin faults. The Oligocene Dunbar Creek Member (Renova Formation) and the Late Miocene-Pliocene Sixmile Creek Formation were deposited as stream channel and mudflow deposits in the North Boulder River basin. The sandstone units are composed of particles derived from the Boulder batholith and Elkhorn Mountains Volcanics.
Streeter, "The Geology of the Southern Bull Mountain Area, Jefferson County, Montana" (1983). Master's Theses. 1653.