Canadian Rockies

Canadian Rockies
Rocheuses canadiennes (French)
Snow Dome, Forbes, Lyells, Et al from Mt. Kitchener.jpg
Highest point
PeakMount Robson
Elevation3,954 m (12,972 ft)
Coordinates53°06′38″N 119°09′21″W / 53.11056°N 119.15583°W / 53.11056; -119.15583Coordinates:53°06′38″N 119°09′21″W / 53.11056°N 119.15583°W / 53.11056; -119.15583
Dimensions
Length1,460 km (910 mi)[1]
Width180 km (110 mi)[1]
Area194,000 km2 (75,000 sq mi)[1]
Geography
Canadian Rockies.png
CountryCanada
ProvincesBritish Columbia and Alberta
Parent rangePacific Cordillera
Geology
OrogenySevier orogeny[2]
Type of rockSedimentary rock
Ringrose Peak, Lake O'Hara, British Columbia

The Canadian Rockies (French: Rocheuses canadiennes) or Canadian Rocky Mountains, comprising both the Alberta Rockies and the B.C. Rockies, is the Canadian segment of the North American Rocky Mountains. It is the easternmost part of the Canadian Cordillera, which is the northern segment of the North American Cordillera, the expansive system of interconnected mountain ranges between the Interior Plains and the Pacific Coast that runs northwest–southeast from central Alaska to the Isthmus of Tehuantepec in Mexico.

Canada officially defines the Rocky Mountains system as the mountain chains east of the Rocky Mountain Trench extending from the Liard River valley in northern British Columbia to the Albuquerque Basin in New Mexico, not including the Mackenzie, Richardson and British Mountains/Brooks Range in Yukon and Alaska (which are all included as the "Arctic Rockies" in the United States' definition of the Rocky Mountains system[3]). The Canadian Rockies, being the northern segment of this chain, is thus defined as comprising the central-eastern section of the North American Cordillera, between the Prairies of Alberta and the Liard Plain of northeastern British Columbia to the east and the Interior Mountains/Plateau and Columbia Mountains to the west. It is divided into the Northern Rockies (which is further subdivided into the Muskwa and Hart Ranges) and Continental Ranges, separated by the McGregor River valley, the McGregor Pass and the Kakwa River valley.

The southern end of the Canadian Rockies extends into the U.S. state of Montana at various sites such as the Wilson Range, Upper Waterton Lake, Boundary Creek, Cameron Lake, Forum Peak, Long Knife Peak, North Fork Flathead River and Frozen Lake. In geographic terms, the boundary is at the Canada–United States border on 49th parallel north, but in geological terms it might be considered to be at Marias Pass in northern Montana.

The Canadian Rockies have numerous high peaks and ranges, such as Mount Robson (3,954 m, 12,972 ft) and Mount Columbia (3,747 m, 12,293 ft). The Canadian Rockies are composed of shale and limestone. Much of the range is protected by national and provincial parks, several of which collectively comprise a World Heritage Site.

Geography

The Canadian Rockies are the easternmost part of the Canadian Cordillera, the collective name for the mountains of Western Canada. They form part of the American Cordillera, an essentially continuous sequence of mountain ranges that runs all the way from Alaska to the very tip of South America. The Cordillera, in turn, is the eastern part of the Pacific Ring of Fire that runs all the way around the Pacific Ocean.

View of Lake Louise in Alberta

The Canadian Rockies are bounded on the east by the Canadian Prairies, on the west by the Rocky Mountain Trench, and on the north by the Liard River. Contrary to popular misconception, the Rockies do not extend north into Yukon or Alaska, or west into central British Columbia. North of the Liard River, the Mackenzie Mountains, which are a distinct mountain range, form a portion of the border between the Yukon and the Northwest Territories. The mountain ranges to the west of the Rocky Mountain Trench in southern British Columbia are called the Columbia Mountains, and are not considered to be part of the Rockies by Canadian geologists.[1]

Highest peaks

Mount Robson in British Columbia

Mount Robson (3,954 m, 12,972 ft) is the highest peak in the Canadian Rockies, but not the highest in British Columbia, since there are some higher mountains in the Coast Mountains and Saint Elias Mountains. Mount Robson lies on the continental divide near Yellowhead Pass, one of the lowest passes in the Canadian Rockies, and is close to the Yellowhead Highway. Its base is 985 m (3,232 ft) above sea level, with a total vertical relief of 2,969 m (9,741 ft).

Mount Columbia (3,747 m, 12,293 ft) is the second-highest peak in the Canadian Rockies, and is the highest mountain in Alberta.

Snow Dome (3,456 m, 11,339 ft) is one of two hydrological apexes of North America. Water flows off Snow Dome into three different watersheds, into the Pacific Ocean, Arctic Ocean, and Atlantic Ocean via Hudson Bay.[4]

The Canadian Rockies are not the highest mountain ranges in Canada. Both the Saint Elias Mountains (highest point in Canada Mount Logan at 5,959 m, 19,551 ft) and the Coast Mountains (highest point Mount Waddington at 4,016 m, 13,176 ft) have higher summits.

Mountain ranges

The Canadian Rockies are subdivided into numerous mountain ranges, structured in two main groupings, the Continental Ranges, which has three main subdivisions, the Front Range, Park Ranges and Kootenay Ranges, and the Northern Rockies which comprise two main groupings, the Hart Ranges and the Muskwa Ranges. The division-point of the two main groupings is at Monkman Pass northwest of Mount Robson and to the southwest of Mount Ovington.

Rivers

The Canadian Rockies are noted for being the source of several major river systems, and also for the many rivers within the range itself. The Rockies form the divide between the Pacific Ocean drainage on the west and that of Hudson Bay and the Arctic Ocean on the east. Of the range's rivers, only the Peace River penetrates the range. Notable rivers originating in the Canadian Rockies include the Fraser, Columbia, North Saskatchewan, Bow and Athabasca Rivers.

Geology

Sodalite-aegirine-albite pegmatite specimen, Ice River Complex, an intrusion partly in Yoho National Park. Field of view ≈7.1 cm across.

The Canadian Rockies are quite different in appearance and geology from the American Rockies to the south of them. The Canadian Rockies are composed of layered sedimentary rock such as limestone and shale, whereas the American Rockies are made mostly of metamorphic and igneous rock such as gneiss and granite.

The Canadian Rockies are overall more jagged than the American Rockies, because the Canadian Rockies have been more heavily glaciated, resulting in sharply pointed mountains separated by wide, U-shaped valleys gouged by glaciers, whereas the American Rockies are overall more rounded, with river-carved V-shaped valleys between them. The Canadian Rockies are cooler and wetter, giving them moister soil, bigger rivers, and more glaciers. The tree line is much lower in the Canadian Rockies than in the American Rockies.

Parks

Peyto Lake, Banff National Park
Moraine Lake July-2001.JPG

Five national parks are located within the Canadian Rockies, four of which are adjacent and make up the Canadian Rocky Mountain Parks. These four parks are Banff, Jasper, Kootenay and Yoho. The fifth national park, Waterton is not adjacent to the others. Waterton lies farther south, straddling the Canada–US border as the Canadian half of the Waterton-Glacier International Peace Park. All five of these parks, combined with three British Columbia provincial parks, were declared a single UNESCO World Heritage Site in 1984[5] for the unique mountain landscapes found there.

Numerous provincial parks are located in the Canadian Rockies, including Hamber, Mount Assiniboine and Mount Robson parks.

Throughout the Rockies, and especially in the national parks, the Alpine Club of Canada maintains a series of alpine huts for use by mountaineers and adventurers.[6]

Human history

The Rockies and the Canadian Pacific Railway

The Canadian Pacific Railway was founded to provide a link from the province of British Columbia to the eastern provinces. The main difficulty in providing such a link were the Rockies themselves: treacherous mountain passes, fast rivers and sheer drops made for a difficult railway construction process. The following articles describe in detail the political and technical feats involved:

See also

  • Ecology of the Rocky Mountains
  • Geology of the Rocky Mountains
  • Arctic Cordillera: an example of another major mountain system in North America east of the Canadian Rockies.
  • The Rocky Mountain Rangers

References

  1. ^ a b c d Gadd, Ben (1995). Handbook of the Canadian Rockies (2nd ed.). Corax Press. ISBN 978-0-9692631-1-1.
  2. ^ "Laramide and Sevier orogenies (PLATE TECTONICS) – g17" (PDF). geowords.com. p. 423. Archived (PDF) from the original on 2020-10-08. Retrieved 2017-08-20.
  3. ^ Madole, Richard F.; Bradley, William C.; Loewenherz, Deborah S.; Ritter, Dale F.; Rutter, Nathaniel W.; Thorn, Colin E. (1987). "Rocky Mountains". In Graf, William L. (ed.). Geomorphic Systems of North America. Decade of North American Geology. Vol. 2 (Centennial Special ed.). Geological Society of America (published 1987-01-01). pp. 211–257. doi:10.1130/DNAG-CENT-v2.211. ISBN 9780813754147. Retrieved 2021-06-22.
  4. ^ Jennings, Ken. "The Canadian Mountain Peak that Feeds Three Different Oceans". Conde Nast Traveler. Archived from the original on 2020-03-03. Retrieved 3 March 2020.
  5. ^ "Canadian Rocky Mountain Parks". World Heritage List. UNESCO. Archived from the original on 2020-10-08. Retrieved 2010-01-01.
  6. ^ "ACC Huts". Alpine Club of Canada. Retrieved 2022-05-23.
Additional Sources

Media files used on this page

Maple Leaf (from roundel).svg
Author/Creator: , Licence: CC-BY-SA-3.0
roundel adopted by Royal Canadian Air Force, from 1946 to 1965.
Canadian Rockies.png
Shaded Relief map of the Canadian Rockies
Moraine Lake July-2001.JPG
Author/Creator: Isruma, Licence: CC BY 3.0
Moraine Lake is a glacially-fed lake in Banff National Park, 14 kilometres (8.7 mi) outside the Village of Lake Louise, Alberta, Canada. It is situated in the Valley of the Ten Peaks, at an elevation of approximately 6,183 feet (1,885 m). The lake has a surface area of .5 square kilometres (0.19 sq mi). The lake, being glacially fed, does not reach its crest until mid to late June. When it is full, it reflects a distinct shade of blue. The color is due to the refraction of light off the rock flour deposited in the lake on a continual basis.
Ringrose.jpg
Ringrose Peak soars above Lake Oesa near Lake O'Hara, British Columbia, Canada
Peyto Lake-Banff NP-Canada.jpg
Author/Creator: Tobias Alt, Tobi 87, Licence: CC BY-SA 4.0
An attraction of Banff National Park in the Canadian province of Alberta: the turquoise Peyto Lake seen from a viewpoint at Icefields Parkway. This water colour is caused by glacier water, carrying what is often called 'rock flour' (tiny particles causing the water to become more opaque).
Snow Dome, Forbes, Lyells, Et al from Mt. Kitchener.jpg
Author/Creator: BrettA343, Licence: CC BY-SA 4.0
Snow Dome (foreground), Mt. Forbes (49 km (30 mi) away), the Lyells (L1, L2, & L3), Farbus Mtn., Oppy Mtn., Castleguard Mtn. and more, as seen from the summit of Mt. Kitchener on the edge of the W:Columbia Icefield... a myriad of Canadian Rocky Mountains, on a May long weekend. The amount of snow you see here in late May is mainly due to the elevation and glaciation in the area - it's not likely snowy on the roads or in the valleys at this time of year in the Rockies. The Great Divide runs through three of the Lyells (L5, L4 & L3) and then along Oppy and Farbus Mountains, so part of the image is in W:Alberta and part in B.C., as well as part in Jasper Park (the foreground) and much in Banff, with some out of any park. Incidentally, Mt. Forbes is the highest peak totally within Banff Park, while Snow Dome is the hydrographic apex of Canada, with water running into three oceans. This photograph is cropped 16:9 and is WQHD (2560x1440 px resolution), so you can download it for use as Apple wallpaper / Windows background or for most TVs, if you wish.
Snow covered mountains in Mount Robson (Unsplash).jpg
Author/Creator: Tim Gouw punttim, Licence: CC0
Mount Robson, Canada
Sodalite-aegirine-albite pegmatite, Ice River Complex BC.jpg
Author/Creator: James St. John, Licence: CC BY 2.0

Sodalite-aegirine-albite pegmatite (field of view ~7.1 cm across) from the Ice River Complex of British Columbia, Canada. Blue = sodalite Very dark green = aegirine pyroxene Whitish = albite/sodium plagioclase feldspar


Here’s an unusual rock that represents a cavity-filling in a pegmatitic syenite. The syenite host rock is dominated by large, whitish albite crystals (= sodium plagioclase feldspar, NaAlSi3O8) (see left & right edges of photo). The cavity fill has nice, large, bluish sodalite crystals (= sodium chloro-aluminosilicate, Na8(AlSiO4)6Cl2)). Surrounding each sodalite is a radiating spray of very dark green needles of aegirine pyroxene (= sodium iron silicate, NaFeSi2O6).

The rock comes from southeastern British Columbia’s Ice River Complex. The Ice River is an 18-kilometer long, 29-square kilometer, backward J-shaped alkaline igneous intrusion emplaced in Cambro-Ordovician passive-margin limestones and shales.

Age: ~356 million years (Tournaisian Stage, Early Mississippian)