2- Mountain Building
The Bighorn Mountains
By studying the rocks in the highest parts of the mountains and the lowest parts of the Bighorn Basin to the west, we know the mountains have been uplifted more than 30,000 feet higher than the same level of rocks in the basin.
The Pryor Mountains
They have steep east facing fronts that have eroded back from the plane of the fault zone and gentle slopes off to the west controlled by the by the resistance to erosion of the Madison Limestone.
Did You Know?
The bighorn sheep disappeared from the area in the 1800s. In the 1970s, Montana and Wyoming state game agencies translocated sheep into nearby areas. Descendants of these sheep moved into the range along Bighorn Canyon and today the estimated population is 150 to 200. More...