Type Locality:

Trout River, District of Mackenzie. It comprises all beds between the cliff-forming Kakisa Fm down to and including the lowest outcrop at Table Rock Rapids. As much of the section is covered, a supplementary section is named in Briggs Turkey Lake No. 1 well, 61 deg 07'30"N, 120 deg 22'30"W between depths of 194.4 m (490 ft) and 237.7 m (780 ft).

Distribution:

On Trout River a 70 m (231 ft) section is developed, in the supplemen-tary section Briggs Turkey Lake No. 1, 88.4 m (290 ft) are present. The upper member is 67 m (220 ft) on Trout River, 79 m (260 ft) in Briggs Turkey Lake No. 1 well. Only 3.4 m (11 ft) of the Jean Marie is exposed on Trout River. It is 9.1 m (30 ft) thick in the supplementary section and more than 15 m (50 ft) in wells in northern Alberta and northeastern British Columbia. The Redknife Fm can be mapped into northeastern British Columbia to a line between the 122nd and 123rd meridians where the Jean Marie Member tongues out into the Fort Simpson shale sequence. It extends southwards as far as the Peace River arch, and can be traced into northeastern Alberta where it passes into a carbonate facies and is included with the Kakisa Fm.

Lithology:

The formation is divided into the Jean Marie Member and an informally designated upper member. The lower Jean Marie Member is variably argillaceous, silty dolomitic limestone with abundant fossil fragments. It grades westward to massive carbonate buildups in northeastern British Columbia between 121 deg and 122 deg west longitude. The upper member is greenish-grey and maroon calcareous mudstones and shales with thin interbeds of argillaceous silty limestones and siltstones and some calcareous quartzose sandstones. The shales pinch out to the south and east and the member becomes a sequence of limestones and siltstones, the former changing to dolomite near the Peace River arch.

Relationship:

It overlies the Tathlina Fm in the Tathlina arch area and northeastern Alberta. To the west and south where the Tathlina Fm is not present it overlies the Fort Simpson Fm and further west, it is replaced by the Fort Simpson Fm. It is conformably overlain by the Kakisa Fm. To the south, it is replaced by carbonates included in the Kakisa Fm. It is correlative with the upper part of the Southesk Fm of the Alberta Rocky Mountains and with Nisku and upper part of the Ireton of central Alberta and the Birdbear of Saskatchewan.

Other Citations:

Bassett and Stout, 1967; Belyea and McLaren, 1962; Law, 1971; McCrossan and Glaister, 1964; Stearn, 1966.