The Fraser Plateau is an
intermontane plateau. It is one of the main subdivisions of the
Interior Plateau
The Interior Plateau comprises a large region of the Interior of British Columbia, and lies between the Cariboo and Monashee Mountains on the east, and the Hazelton Mountains, Coast Mountains and Cascade Range on the west.''Landforms of British Co ...
located in the
Central Interior of British Columbia
Central is an adjective usually referring to being in the center of some place or (mathematical) object.
Central may also refer to:
Directions and generalised locations
* Central Africa, a region in the centre of Africa continent, also known a ...
.
Geography
The region includes the
Cariboo Plateau and
Chilcotin Plateau
The Chilcotin Plateau is part of the Fraser Plateau, a major subdivision of the Interior Plateau of British Columbia. The Chilcotin Plateau is physically near-identical with the region of the same name, i.e. "the Chilcotin", which lies between ...
, and the adjoining
Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Marble is typically not foliated (layered), although there are exceptions. In geology, the term ''marble'' refers to metamorpho ...
,
Clear and
Camelsfoot Range
The Camelsfoot Range is a sub-range of the Chilcotin Ranges subdivision of the Pacific Ranges of the Coast Mountains in British Columbia. The Fraser River forms its eastern boundary. The range is approximately 90 km at its maximum length and ...
s on its southwestern edge.
It is defined as lying between the
Bonaparte River The Bonaparte River is a tributary of the Thompson River, joining it at the community of Ashcroft, British Columbia. The river is about long, including the length of Bonaparte Lake. Rising on the Silwhoiakun Plateau to the northwest of Kamloops, t ...
on its southeast, beyond which is the
Bonaparte or Kamloops Plateau, part of the
Thompson Plateau
The Thompson Plateau forms the southern portion of the Interior Plateau of British Columbia, Canada, lying to the west of Okanagan Lake, south of the Thompson River and east of (although never adjoining it) the Fraser River. At its most southern po ...
, and by a line formed by the
Dean and
West Road Rivers on its northwest (the
Nechako Plateau
The Nechako Plateau is the northernmost subdivision of the Interior Plateau, one of the main geographic regions of the Canadian province of British Columbia. It spans the basin of the Nechako River and its tributaries the Stuart River and Endako ...
lies to the north of the West Road).
Also included in the Fraser Plateau are the
Itcha and
Ilgachuz Ranges and the adjoining
Rainbow Range, which adjoin the
Coast Mountains
The Coast Mountains (french: La chaîne Côtière) are a major mountain range in the Pacific Coast Ranges of western North America, extending from southwestern Yukon through the Alaska Panhandle and virtually all of the Coast of British Colum ...
.
Geology
The Fraser Plateau consists of
basalt
Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% of a ...
ic lava of the
Chilcotin Group, a group of related volcanic rocks that is nearly parallel with the Fraser Plateau.
Chasm and Dog Creek lithofacies, Chilcotin Group basalt, Bonaparte Lake map area, British Columbia
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See also
*Fraser Plateau and Basin complex (WWF ecoregion)
The Fraser Plateau and Basin Complex is an ecoregion, as defined by the World Wildlife Fund. It encompasses the middle reaches of the watershed of the Fraser River as it traverses the northern part of the Interior Plateau of British Columbia. ...
Notes
References
*
*''Landforms of British Columbia'', S. Holland, BC Govt publication, 1976
Interior Plateau
Central Interior of British Columbia
Plateaus of British Columbia
Lava plateaus
Volcanism of British Columbia
Back-arc volcanism
Fraser River
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