The Griper Bay Formation is a widespread marine clastic deposit, which is of Late Devonian (Frasnian and Famennian) age, as indicated by assemblages of spores and marine invertebrates, largely brachiopods. On east Bathurst Island, it rests unconformably on folded Middle Devonian and older rocks indicating a hitherto unknown episode of deformation of the Boothia uplift and the Cornwallis fold belt in Middle to Late Devonian time. Information on the Upper Devonian faunas of the Canadian Arctic Islands is synthesized, and for the first time well-dated spore floras are described from this region.

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