The dominantly plutonic Canadian Coast Belt is flanked on the northwest by a Late Jurassic-Early Cretaceous intra- or back-arc basin. In the south it contains strata of the same age deposited in an accretionary fore-arc complex, east of a coeval arc. This distribution is ascribed to pre-mid-Cretaceous sinistral movement of part of the Jurassic-Cretaceous North American plate margin arc to a position west of the accretionary fore-arc complex.

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