Geologic Evolution Of The Beartooth Mountains Montana And Wyoming PDF Download

Surrounding the Bighorn Basin are several mountainous tracts, including the Beartooth range, which were formed by uplift and thrusting during the Laramian Revolution. Each mountain range exposes a core of Precambrian crystalline rocks, with peripheral drapes of Paleozoic and younger sediments. Results of geophysical work have served to emphasize the magnitude of vertical relief resulting in large part from Laramian movements. For example, the surface between the Flathead sandstone and Precambrian crystallines on the Beartooth Plateau is at 12,000 ft. above sea level, but near Red Lodge this surface is found to be more than 10,000 ft. below sea level. --Introduction, first paragraph.