The Lewis Range is a mountain range located in the Rocky Mountains of northern Montana, U.S. and extreme southern Alberta, Canada. Formed by the Lewis Overthrust beginning 170 million years ago, an enormous slab of Precambrian rocks 3Â miles (4.8Â km) thick, 50 miles (80Â km) wide and 160 miles (260Â km) long faulted and slid over newer rocks of the Cretaceous period. In this relatively rare occurrence, older rocks are now positioned above newer ones.
The Lewis Range is within Waterton Lakes National Park in Canada, and in Glacier National Park and the Bob Marshall Wilderness Complex located in Flathead and Lewis and Clark National Forests in Montana. The Continental Divide spans much of the uppermost sections of the range. Major peaks in the range include Mount Cleveland (10,466Â ft/3,185Â m), which is the highest peak in the range and in Glacier National Park. Other prominent peaks include Mount Stimson (10,142Â ft/3,091Â m), Mount Jackson (10,052Â ft/3,064Â m), Mount Siyeh (10,014Â ft/3,052Â m), Going to the Sun Mountain, (9,642Â ft/2,939Â m) and the isolated Chief Mountain (9,080Â ft/2,768Â m). The Chinese wall in the Bob Marshall Wilderness is a 1,000Â foot (304Â m) high feature that runs for 40 miles (64Â km). Major passes include Marias Pass and Logan Pass which bisects Glacier National Park east to west.
See also
- Mountains and mountain ranges of Glacier National Park (U.S.)
- List of mountain ranges in Montana
External links
- Glacier National Park. "Lewis Overthrust Fault". Geology. Retrieved 2006-05-08.Â
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