Lewis Range
The Lewis Range is a mountain range located in the Rocky Mountains of northern Montana, United States and extreme southern Alberta, Canada. It was formed as a result of the Lewis Overthrust, a geologic thrust fault involving the overlying of younger Cretaceous rocks by older Proterozoic rocks. The range is located within Waterton Lakes National Park in Alberta, Canada and Glacier [National Park (U.S.)|Glacier National Park] and the Bob Marshall Wilderness Complex in Montana, United States. The highest peak is Mount Cleveland at.
Geography
The Lewis Range is within Waterton Lakes National Park in Canada, and in Glacier National [Park (U.S.)|Glacier National Park] in Montana. The Continental Divide spans much of the uppermost sections of the range. Major peaks in the range include Mount Cleveland, which is the highest peak in the range and in Glacier National Park. Other prominent peaks include Mount Stimson, Mount Jackson, Mount Siyeh, Going to the Sun Mountain, and the isolated Chief Mountain. This sharp range begins north of Marias Pass and includes Logan Pass which bisects Glacier National Park east to west.
Geology
Formed by the Lewis Overthrust beginning 170 million years ago, an enormous slab of Precambrian rocks thick, wide and long faulted and slid over newer rocks of the Cretaceous period. In this relatively rare occurrence, older rocks are now positioned above newer ones.