On the basis of microfaunal data, the Bearpaw formation in Southwestern Saskatchewan, and in the Dunmore area, Alberta, was subdivided into six zones, listed in descending order:

Gyroidina sp. and Ostracod Zone, Glauconite Zone. Ammodiscus Zone, Anomalina Zone, Plectina smithia Zone and Tritaxia crydermanensa Zone (including the Arctica ovata zone). In the western plains area, three of these zones are present, but the forms are more brackish in habitat and facies variations exist between the western and eastern plains area. The Blood Reserve formation (Russell) is reduced to a member status of the Bearpaw formation and is correlated with the Oxarart member on the basis of stratigraphic position, lithologic characteristics and similar fossil content. A microfossil list and three plates of microfossils are appended.

Abstracted by R. L. Thompson, Socony Vacuum Co.

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