Lower Permian brachiopods and molluscs from the upper Jungle Creek Formation, northern Yukon Territory, Canada

The study provides a comprehensive systematic account of Lower Permian brachiopods and molluscs (excluding gastropods) from the upper Jungle Creek Formation in northern Yukon Territory, western Canada, and to assess their biostratigraphic and paleoecological significance. Sixty-nine brachiopod species belonging to 53 genera, six bivalve species belonging to five genera, and one ammonoid species are described and illustrated. The three brachiopod biozones previously recognized within the upper Jungle Creek Formation are revised and substantiated. A computerized ordination technique (principal components analysis) is used to delineate recurrent paleocommunities. Four fossil communities are recognized. These paleocommunities are analyzed in terms of faunal composition and possible depositional environments.