The identification of an Early Jurassic arc-trench gap assemblage floored by oceanic crust in southwestern British Columbia supports previous inferences of an “inland” subduction zone during Mesozoic time. The tectonic and sedimentary records preserved between oceanic and arc rocks suggest an arc-trench gap site that evolved from a fore-arc setting in Early Jurassic time to an interarc setting in Late Jurassic time to a successor basin during Cretaceous time. A westward subduction shift during Middle Jurassic time is therefore inferred.

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