Twenty-two arenaceous and 19 calcareous species of Foraminifera are described and illustrated from the Deer Bay Formation at Buchanan Lake, Axel Heiberg Island, and Isachsen, Ellef Ringnes Island, Northwest Territories, Canada.

Species described include: two species of Ammodiscus; one each of Ammodiscoides, Glomospira, Reophax, Verneuilinoides, Verneuliina, Tritaxia, Textularia, Astacolus, Vaginulina, Vaginulinopsis, Marginulinopsis, Globulina, Epistomina and Conorboides; three of Haplophragmoides, five of Ammobaculites and six of Trochammina; four each of Lenticulina and Saracenaria and two each of Dentalina and Nodosaria.

In addition 15 Mesozoic microspores, six Palaeozoic microspores, two Jurassic dinoflagellates and two hystrichosphaerids are briefly described and illustrated. One zone, characterized by Trochammina sp. A, is recognized in the Deer Bay Formation. This zone and the intervals containing the most abundant calcareous fauna have been correlated in the two localities. On the basis of microspores, dinoflagellates, hystrichosphaerids and megafauna the age of the Deer Bay Formation is Portlandian, or older, to Middle Neocomian. The position of the Jurassic-Cretaceous boundary within the formation has been approximated.

An alternative interpretation assuming regional diastrophism is presented.

The six Palaeozoic microspores indicate a southeasterly source for the Deer Bay Formation which was deposited in an inner to outer sublittoral fluctuating environment.

End_of_Record - Last_Page 455-------