Seven_Sisters_Mountain

Seven Sisters Mountain

Seven Sisters Mountain

Mountain in the country of Canada

Not to be confused with Seven Sisters Peaks.

Seven Sisters Mountain is a 2,591-metre-high (8,501 ft) mountain summit located in the Canadian Rockies of Alberta, Canada.

Quick Facts Highest point, Elevation ...

Description

Seven Sisters Mountain is situated 11 kilometres (6.8 mi) northwest of the town of Coleman in the Crowsnest Pass area and can be seen from Highway 3, the Crowsnest Highway.[3] The mountain is set near the southern end of the High Rock Range. Precipitation runoff from the mountain drains west to Allison Creek and east to McGillivray Creek which are both tributaries of the nearby Crowsnest River. Topographic relief is significant as the summit rises 870 metres (2,850 ft) above Allison Creek in two kilometres (1.2 mi). The summit of Seven Sisters Mountain lies four kilometres (2.5 mi) east of the Continental Divide and the nearest higher neighbor is Crowsnest Mountain, 2 kilometres (1.2 mi) immediately to the south.

History

This landform was originally named "The Steeples" by the Palliser expedition.[4] The mountain's present toponym was officially adopted in 1978 by the Geographical Names Board of Canada.[2] The descriptive name is attributable to its seven distinct towers and pinnacles.[5]

The first ascent of the summit was made in 1951 by Bruno Engler.[3]

Geology

Seven Sisters Mountain is composed of limestone and shale of Late Devonian to Early Mississippian age. Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of rocks three miles (4.8 km) thick, 50 miles (80 km) wide and 160 miles (260 km) long over younger rock during the Laramide orogeny.[6] The thrust sheet has since been cut through by erosion along Allison Creek, leaving Seven Sisters Mountain and Crowsnest Mountain standing together as an isolated klippe.[7]

Climate

Based on the Köppen climate classification, the mountain has an alpine subarctic climate with cold, snowy winters, and mild summers.[8] Temperatures can drop below −20 °C with wind chill factors below −30 °C.

  • South aspect, from Crowsnest Mountain
  • Southwest aspect
  • Seven Sisters Mountain (left) and Crowsnest Mountain (right)
  • Southwest aspect

See also

References

  1. [1]
    Aphrodite Karamitsanis (1991), Place Names of Alberta, Vol I: Mountains, mountain parks, and foothills, University of Calgary Press, ISBN 978-0919813731, p. 221
  2. [2]
    "Seven Sisters Mountain". Geographical Names Data Base. Natural Resources Canada. Retrieved September 19, 2022.
  3. [3]
    "Seven Sisters Mountain". cdnrockiesdatabases.ca. Retrieved September 19, 2022.
  4. [4]
    Dave Birrell (2000), "50 Roadside Panoramas in the Canadian Rockies", Rocky Mountain Books, ISBN 9780921102656, p. 139
  5. [5]
    Glen W. Boles, William Lowell Putnam, Roger W. Laurilla (2006), "Canadian Mountain Place Names", Rocky Mountain Books, ISBN 9781894765794, p. 74
  6. [6]
    Gadd, Ben (2008). Geology of the Rocky Mountains and Columbias.
  7. [7]
    R.A. Price, 1962. Geologic structure of the central part of the Rocky Mountains in the vicinity of Crowsnest Pass, Journal of the Alberta Society of Petroleum Geologists, vol. 10, no. 7, p. 341-351.
  8. [8]
    Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrology and Earth System Sciences. 11: 1633–1644. ISSN 1027-5606.
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