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The Western Cordillera

The Western Cordillera The Western Cordillera is the dramatic mountainous region that defines Canada's western edge. Stretching from the US border to the Arctic, it includes the Rocky Mountains , Coast Mountains , Columbia Mountains , and the volcanic ranges of British Columbia. Formation Unlike the ancient Canadian Shield, the Western Cordillera is geologically young — mostly formed in the last 200 million years through two main processes: 1. Terrane Accretion British Columbia is a geological patchwork — assembled from over 20 distinct blocks of crust terranes that formed far out in the Pacific Ocean and were carried to North America by plate tectonics: - Wrangellia : A massive volcanic terrane that includes Vancouver Island and Haida Gwaii - Stikinia : An island arc complex forming much of central BC - Cache Creek : Oceanic rocks including ancient seafloor and tropical limestone with fossils of tropical organisms that formed near the equator 2. Subduction and Compression The collision of Pacific plates with North America: - Compressed the accreted terranes against the continent - Folded and thrust older rocks eastward, creating the Rocky Mountains - Created volcanic arcs from subduction-related magmatism The Rocky Mountains The Canadian Rockies are primarily made of Paleozoic and Mesozoic sedimentary rocks that were folded and thrust eastward: - Limestone , dolostone , shale , and sandstone — many originally deposited in ancient seas - The Burgess Shale in Yoho National Park contains some of the world's most important Cambrian fossils 508 million years old - Mt. Robson 3,954 m is the highest peak in the Canadian Rockies Volcanic Activity The Cascadia Subduction Zone drives ongoing volcanic activity in southwestern BC: - Mt. Meager : Canada's most recently active volcano last erupted 2,350 years ago - Mt. Garibaldi : A prominent stratovolcano near Squamish - The Nazko Cone in central BC erupted only 7,200 years ago - Hot springs throughout BC are evidence of ongoing geothermal activity Mineral Deposits The Cordillera hosts significant mineral deposits: - Copper-gold porphyry deposits Highland Valley, Mount Milligan - Placer gold Cariboo Gold Rush, Klondike - Coal southeastern BC - Jade BC produces most of Canada's nephrite jade

Verification resources

Cross-check terminology, classification, methods, and safety with these authoritative external resources.

  • Geological Survey of Canada — Natural Resources Canada. Authoritative Canadian geoscience, mineral-exploration, climate, and natural-hazard research.
  • Geoscience maps — Natural Resources Canada. Government of Canada bedrock, surficial, glacial, geochemical, and hazard map resources.
  • Unlocking the secrets of Canadian volcanoes — Natural Resources Canada. Current Geological Survey of Canada context for potentially active volcanic fields, InSAR monitoring, non-magmatic deformation, and hazard baselines.
  • Canadian Rocky Mountain Parks — Parks Canada. Official World Heritage context for the folded and faulted Canadian Rockies and the scientific importance of the Burgess Shale fossil sites.

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