Date of Award
12-1983
Degree Name
Master of Science
Department
Geological and Environmental Sciences
First Advisor
Dr. Christopher J. Schmidt
Second Advisor
Dr. W. Thomas Straw
Third Advisor
Dr. William B. Harrison III
Access Setting
Masters Thesis-Open Access
Abstract
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.
Recommended Citation
Streeter, Michael Edward, "The Geology of the Southern Bull Mountain Area, Jefferson County, Montana" (1983). Masters Theses. 1653.
https://scholarworks.wmich.edu/masters_theses/1653