Rocky Mountain Erosion Surface
Rocky Mountain Erosion Surface. This low-relief pediment formed during late Eocene time across much of the Front Range of the Rocky Mountains. The development of the pediment followed the Laramide period of mountain-building, which ended about 40 million years ago. Regional uplift since then raised the pediment thousands of feet above the plains to the east and subjected it to extensive incision. Widespread remnants of the once-continuous surface serve as markers for later uplift and deformation of the Rockies. The surface seen here is at an elevation of about 12,000 ft. View is looking southeast toward Storm Peak and Longs Peak. Rocky Mountain National Park. Larimer Co., Colo.