LATE TRIASSIC CORDILLERA

Hypothetical west-facing magmatic arc of same scale and curvature as modern Aleutian arc encloses a marginal sea floored by late Paleozoic-Triassic oceanic crust and marine sediments (Cache Creek, etc.). The arc collapses against North America beginning in late Triassic.

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Early Jurassic
Middle Jurassic
Early Cretaceous
Middle Cretaceous
Late Cretaceous
Late Paleocene