Pacific Ranges

Pacific Ranges
Pacific Ranges
French: Chaînons du Pacifique
	Mount Garibaldi massif as seen from Squamish
Highest point
Peak	Mount Waddington
Elevation	4,019 m (13,186 ft)
Coordinates	51°22′30″N 125°15′30″W / 51.37500°N 125.25833°W
Dimensions
Area	108,237 km2 (41,791 sq mi)
Geography
	Pacific Ranges as defined in S. Holland Landforms of British Columbia
Location	British Columbia, Canada
Parent range	Coast Mountains

The Pacific Ranges are the southernmost subdivision of the Coast Mountains portion of the Pacific Cordillera. Located entirely within British Columbia, Canada, they run northwest from the lower stretches of the Fraser River to Bella Coola and Burke Channel,^[1] north of which are the Kitimat Ranges. The Coast Mountains lie between the Interior Plateau and the Coast of British Columbia.^[2]^[3]

The Pacific Ranges include four of the five major coastal icecaps in the southern Coast Mountains. These are the largest temperate-latitude icecaps in the world and fuel a number of very major rivers (by volume, not length). One of these contains Mount Waddington, the highest summit entirely within British Columbia. Also within this region is Hunlen Falls, among the highest in Canada, located in Tweedsmuir South Provincial Park.

Other than logging and various hydroelectric developments, and a large ski resort at Whistler, most of the land in the range is completely undeveloped. Historically, in the southern part of the range, mining was important at various times in the Lillooet, Bridge River and Squamish areas, and large pulp and paper mills at Powell River, Port Mellon and Woodfibre. The largest hydroelectric development in the Pacific Ranges is the Bridge River Power Project, though smaller hydro plants are on the Stave River-Alouette Lake system in Mission and Maple Ridge, the Daisy Lake-Squamish River division of the Cheakamus Powerhouse, and another power dam and power plant at Clowhom. Although the range was extensively surveyed for possible rail routes, only that of the Pacific Great Eastern (now part of CN) was eventually built; the Homathko River-Bute Inlet route, however, was one of the two main choices in the deliberations of the CPR's routing.

Geology

The Pacific Ranges are part of the southern portion of the Coast Plutonic Complex and has been characterized by rapid rates of uplift over the past 4 million years, which has led to relatively high rates of erosion.

The Garibaldi Volcanic Belt is within the Pacific Ranges, which is a volcanic belt formed by the subduction of the Juan de Fuca Plate (a remnant of the much larger Farallon Plate) under the North American Plate along the Cascadia subduction zone. The belt is the northern extension of the Cascade Volcanic Arc in the United States (which includes the volcanoes Mount St. Helens and Mount Baker) and contains the most explosive young volcanoes in Canada. The eruption styles in the belt range from effusive to explosive, with compositions from basalt to rhyolite. Morphologically, centers include calderas, cinder cones, stratovolcanoes and small isolated lava masses. Due to repeated continental and alpine glaciations, many of the volcanic deposits in the belt reflect complex interactions between magma composition, topography, and changing ice configurations. The most recent major catastrophic eruption in the Garibaldi Volcanic Belt was from the Mount Meager massif 2,350 BP, which is Canada's most recent major catastrophic eruption.

The Garibaldi Volcanic Belt contains two extra volcanic fields, the Franklin Glacier Complex and the Silverthrone Caldera, which lie 140 and 190 km northwest of the main volcanic belt.

The Cascadia subduction zone is a 680 mi (1,094 km) long fault, running 50 mi (80 km) off the west-coast of the Pacific Northwest from northern California to Vancouver Island. The plates move at a relative rate of over 0.4 inches (10 mm) per year at a somewhat oblique angle to the subduction zone.

Unlike most subduction zones worldwide, there is no oceanic trench present along the continental margin in Cascadia. Instead, terranes and the accretionary wedge have been uplifted to form a series of coast ranges and exotic mountains. A high rate of sedimentation from the outflow of the three major rivers (Fraser River, Columbia River, and Klamath River) which cross the Cascade Range contributes to further obscuring the presence of a trench. However, in common with most other subduction zones, the outer margin is slowly being compressed, similar to a giant spring. When the stored energy is suddenly released by slippage across the fault at irregular intervals, the Cascadia subduction zone can create very large earthquakes, such as the 8.7–9.2 M_w  Cascadia earthquake of 1700.

Major Named Subranges

Niut Range
Pantheon Range
Waddington Range
Whitemantle Range
Chilcotin Ranges
Bendor Range
Lillooet Ranges
- Cayoosh Range
- Cantilever Range
Douglas Ranges
Garibaldi Ranges
North Shore Mountains (Front Ranges)
Tantalus Range
Clendinning Range
- the Camelsfoot Range running north along the west bank of the Fraser from Lillooet is sometimes considered to be part of the Chilcotin Ranges, but in other definitions is part of the Interior Plateau

Many smaller ranges and subranges are not listed at present.

Major Icefields

(Other than the Waddington Range these are also considered to be "ranges" but are listed separately here because of their unique character).

Monarch Icefield
Ha-Iltzuk Icefield (Silverthrone Glacier)
Waddington Range
Homathko Icefield
Lillooet Icecap (Lillooet Crown)
Pemberton Icecap

Major Peaks

Provincial Parks

List is incomplete

Some Protected areas, recreation areas and other non-park preservation areas are not listed.

Major Rivers

Many relatively unknown rivers of considerable size along the coastal flank of the range are not listed, partly because they are largely unknown and also very difficult to access. For a full listing of rivers in the Pacific Ranges, see List of rivers of the Pacific Ranges.

References

^ BC Names/GeoBC entry "Pacific Ranges"
^ "S. Holland, Landforms of British Columbia, Province of British Columbia, 1976, pp 42-43" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2014-04-26.
^ "map from Bulletin 48: Landforms of British Columbia" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2014-04-26.

Canadian Mountain Encyclopedia article on the Pacific Ranges

External links

[1] BC Names/GeoBC entry "Pacific Ranges"

[2] "S. Holland, Landforms of British Columbia, Province of British Columbia, 1976, pp 42-43" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2014-04-26.

[3] "map from Bulletin 48: Landforms of British Columbia" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2014-04-26.

[1]

[2]

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v t e Pacific Ranges
Ranges	Bendor Britannia Bunster Cadwallader Calliope Camelsfoot Cantilever Caren Cayley Chilcotin Colville Conical Douglas Earle Edwards Fannin Fitzsimmons Franklyn Fraser Garibaldi Gastineau Georgina Koeye Lewis Lillooet Meager Namu Nicholl Niut North Shore Pantheon Pembroke Sir Harry Tantalus Tottenham Unwin Waddington Wharncliffe Whitemantle
Mountains	Akasik Alfred Alice Arthur Asperity Birkenhead Bishop The Black Tusk Blackcomb Blanshard Brandywine Breakenridge Brew Brew Burke Callaghan Capricorn Castle Towers Cauldron Cayley Cinder Cone Clarke Coquitlam Crevasse Crag Crickmer Crown Currie Cypress Devastator Dewdney Eagle Edge Elsay Fang Fee Fitzgerald Forefinger Frederick William Fromme Garibaldi Good Hope Grouse Helena Job Judge Howay ḵ’els Kinch Little Finger Little Ring Luna Mamquam Meager Merlon Middle Finger Monarch Monmouth Munday Nicomen One Eye Opal Cone Overill Pali Petlushkwohap Plinth Powder Price Pylon Pyroclastic Queen Bess Raleigh Red Tusk Ring Robie Reid Round Serratus Seymour Silverthrone Skihist Stein Somolenko Spearhead Table Tantalus Taseko Tatlow Tiedemann Tricouni Tuber Vic Vulcan's Thumb Waddington Wedge Wellington ʔEniyud (Niut)
Passes	Cayoosh Griswold McGillivray Pemberton Railroad Tyoax Wedge
Glaciers	Chaos Compton Névé Diamond Franklin Garibaldi Névé Ha-Iltzuk Homathko Klinaklini Mamquam Monarch Parallel Pashleth Powder Mountain Silverthrone Spearhead
Communities	List of communities in British Columbia
Parks	Clendinning Duffey Lake Garibaldi Mount Elphinstone Stein Valley Nlaka'pamux Heritage Spruce Lake (South Chilcotin) Upper Lillooet Golden Ears Tantalus Mehatl Creek Birkenhead Lake Joffre Lakes Ts'il?os Bishop River Princess Louisa Marine Callaghan Nairn Falls Brandywine Falls Alice Lake Blackcomb Glacier Tetrahedron Stawamus Chief Murrin Mount Seymour Cypress Say Nuth Khaw Yum (Indian Arm) Pinecone-Burke Shannon Falls Rolley Lake Sasquatch Big Creek Homathko Estuary Davis Lake

v t e Coast Mountains of North America
Ranges	Adam Ashington Bastion Bare Top Bell Bendor Boundary Boundary Britannia Bunster Burnaby Burniston Cadwallader Calliope Camelsfoot Cantilever Caren Cape Chechidla Cheja Chilcotin Chismore Clendinning Colville Conical Countess of Dufferin Dezadeash Dickson Douglas Earle Edwards Fannin Fitzsimmons Florence Franklyn Fraser Garibaldi Gastineau Georgina Halleck Kakuhan Kitimat Kitlope Koeye Leckie Lewis Lillooet Lincoln Longview McBride Mission Murphy Namu Nicholl Niut North Shore Pacific Pantheon Peabody Pembroke Potato Richardson Rousseau Sawtooth Seward Sir Harry Snowslide Shulaps Spearhead Spiller Tantalus Tenaiko Tottenham Unwin Waddington Wharncliffe Whitemantle Williams Wimbledon
Mountains	Alfred Alice Arthur Birkenhead Bishop Blackcomb Blanshard Brandywine Brew Burke Castle Towers Chutine Cinder Clarke Coquitlam Crickmer Crown Currie Cypress Devils Paw Devils Thumb Dewdney Dipyramid Eagle Elsay Fang Fitzgerald Forefinger Frederick William Fromme Garibaldi Good Hope Grouse Helena Hoodoo Judge Howay Kates Needle Kinch Little Bear Little Finger Little Ring London Luna Meager Merlon Middle Finger Monarch Monmouth Munday Nicomen One Eye Overill Pali Powder Price Queen Bess Raleigh Robie Reid Serratus Seymour Silverthrone Skihist Somolenko Tantalus Taseko Tatlow Red Tusk Spearhead Tiedemann Vic Victoria Waddington Wedge Wellington
Passes	Cayoosh Chilkoot Griswold Heckman McGillivray Pemberton Railroad Taylor Tyoax Warner Wedge White Wolverine
Glaciers	Cambria Diamond Ha-Iltzuk Homathko Hoodoo Juneau Kingcome Klinaklini Misty Monarch Pashleth Pemberton Powder Mountain Salmon Silverthrone Spearhead Stikine Twin
Parks	Bear Glacier Big Creek Callaghan Lake Clendinning Duffey Lake Garibaldi Mount Elphinstone Stein Valley Nlaka'pamux Heritage Ts'il?os