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Flexural slip folding in the Canadian Rockies of Alberta, west of Calgary. The Canadian Rockies are part of the North American Cordillera, a mountain belt that extends southward from Alaska along the plate margin. Uplift of this range occurred from late Jurassic through early Cenozoic. Deformed rocks are Carboniferous carbonates. Photo ID 697

Flexural slip folding in the Canadian Rockies of Alberta, west of Calgary. The Canadian Rockies are part of the North American Cordillera, a mountain belt that extends southward from Alaska along the plate margin. Uplift of this range occurred from late Jurassic through early Cenozoic. Deformed rocks are Carboniferous carbonates. Photo ID 697

Photograph: David Manaker

Reference: Eyles & Miall, 2007, Canada Rocks, 512 pages.