Abstract

Ammonites of the Late Callovian Lamberti zone and of the Early Oxfordian Mariae and Cordatum zones are described from sedimentary sections on the south and southeastern margins of the Bowser Basin. They date a regressive sequence of Hazelton Group sedimentary rocks older than the main clastic sediments of the Bowser Basin. This is the first record of Upper Callovian rocks in Canada.

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