Abstract

Recently collected paleomagnetic data, combined with earlier published data, tend to confirm earlier models for the tectonic development of southwestern Alaska. The models involve a basically northward migration and rotation of southwestern Alaska between Cretaceous time and the present, with an earlier southward motion. If the paleolongitudes of the reconstructions are constrained by always keeping southwestern Alaska in contact with North America, some geologic conflicts arise. These may possibly be resolved if large-scale en echelon movement can be proved along such features as the Bruin Bay and Border Ranges faults.

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