Abstract

New field observations from the northern termination of the Kootenay arc show that lower Paleozoic rocks assigned to the Kootenay terrane are depositionally linked to and conformable with underlying rocks that form part of the North American Cordilleran miogeocline. Accordingly, models involving an allochthonous origin for the Kootenay terrane should be reevaluated. The presence of coarse clastic rocks and mafic volcanic rocks within the lower Paleozoic sequence of the Kootenay arc is explained in terms of intermittent early Paleozoic extensional deformation, such as is well documented elsewhere along the Cordilleran margin of the North American craton.

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