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 resulted in 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 and the Bob Marshall Wilderness Complex in Montana, United States. The highest peak is Mount Cleveland at 10,466 ft (3,190 m).

Not to be confused with Lewis Range (Coast Mountains).
Lewis Range
Mount Cleveland is the highest peak in the Lewis Range
Highest point
PeakMount Cleveland
Elevation10,466 ft (3,190 m)
Coordinates48°55′29″N 113°50′53″W 
Geography
Lewis Range
Location in Montana
Lewis Range
Location in the United States
CountriesUnited States and Canada
Province/StateMontana and Alberta
Parent rangeRocky Mountains
Geology
OrogenyLewis Overthrust

Geology

Formed by the Lewis Overthrust beginning 170 million years ago, an enormous slab of Precambrian rocks 3 miles (4.8 km) thick, 50 miles (80 km) wide and 160 miles (260 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.

Geography

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 (10,466 ft/3,185 m), which is the highest peak in the range and in Glacier National Park. Other prominent peaks include Mount Stimson (10,142 ft/3,091 m), Mount Jackson (10,052 ft/3,064 m), Mount Siyeh (10,014 ft/3,052 m), Going to the Sun Mountain, (9,642 ft/2,939 m) and the isolated Chief Mountain (9,080 ft/2,768 m). The Chinese wall in the Bob Marshall Wilderness is a 1,000 foot (304 m) high feature that runs for 40 miles (64 km). Major passes include Marias Pass and Logan Pass which bisects Glacier National Park east to west.

gollark: If they mean approximately the same things as in the calculus I did, then if the gradient was positive/negative on one side and the same sign on the other it would not be a maximum/minimum but just an inflection point. But if the gradient changes sign, then it can be, and this probably requires a different value to on either side. But I don't really get what they're saying either.
gollark: I think to be a valid maximum/minimum it has to be >/< but *not* equal?
gollark: This is quite complicated. I may need a while.
gollark: I "can" read it "for" you?
gollark: So what would you say your favourite alleged features are and what are the most important unimplemented ones to you?

See also
  • Glacier National Park. "Lewis Overthrust Fault". Geology. Retrieved 2006-05-08.
  • Media related to Lewis Range at Wikimedia Commons
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