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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
An Unconformity Between Middle and Upper Devonian Rocks of Bathurst Island, with Comments on Upper Devonian Faunas and Microfloras of the Parry Islands
ABSTRACT
The Griper Bay Formation is a widespread marine clastic deposit of Frasnian and Famennian ages, comprising mainly grey-green argillaceous quartz sandstones, and dark green siltstones and shales. Frasnian (early Late Devonian) fossils identified from the Griper Bay Formation include spores from Bathurst and Helena Islands, and marine invertebrates from Prince Patrick Island. Famennian (late Late Devonian) fossils from the formation include spores from Bathurst Island, and marine invertebrates from Bathurst, Cameron, Byam Martin and Melville Islands. On eastern Bathurst Island the Griper Bay Formation rests unconformably upon 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. The deformation was restricted to those regions and dies out westward within the Griper Bay Formation on Bathurst Island; however, it probably provided a source for coarse pebble conglomerates in the formation on Helena Island and pebbly sandstones on Cameron and western Bathurst Islands.
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