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The Lewis Range is a
mountain range A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have aris ...
located in the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...
of northern
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...
, United States and extreme southern
Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...
, Canada. It was formed as a result of the Lewis Overthrust, a geologic thrust fault involving the overlying of younger
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
rocks by older
Proterozoic The Proterozoic ( ) is the third of the four geologic eons of Earth's history, spanning the time interval from 2500 to 538.8 Mya, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozo ...
rocks. The range is located within Waterton Lakes National Park in
Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...
, Canada and Glacier National Park and the Bob Marshall Wilderness Complex in
Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...
, 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 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 The Precambrian ( ; or pre-Cambrian, sometimes abbreviated pC, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of t ...
rocks thick, wide and long faulted and slid over newer rocks of the
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
period. In this relatively rare occurrence, older rocks are now positioned above newer ones.


See also

* List of mountains and mountain ranges of Glacier National Park (U.S.)


References


External links

* * {{Authority control Mountain ranges of Alberta Mountain ranges of Montana Landforms of Flathead County, Montana Landforms of Glacier County, Montana Glacier National Park (U.S.) Mountains of Glacier National Park (U.S.)