Devonian strata of northeastern Banks Island consist of 3700 feet of sandstones, siltstones, and shales, with minor but spectacular carbonate reef buildups. These strata range in age from lowermost Frasnian to mid-Famennian and are time equivalents of the Melville Island Group of Melville Island. The sequence of environments represented by these rocks may be related to the development of a northerly derived clastic wedge prograding southward through time. The area underwent Ellesmerian deformation, which produced gentle folds and normal faults which were re-activated during Tertiary deformation.

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