Devonian genera and species from welt cores cut in west-central and north-western Alberta are identified and described. The cores from northwestern Alberta are from the lower Hay River shale and Slave Point formations; those from west-central Alberta are from the Swan Hills member (and its equivalents) of the Beaverhitl Lake formation.

The lower Hay River shale in northern Alberta above the Slave Point formation carries the Lingula cf. spatulata fauna of the Firebag member of the basal Waterways formation. The fauna of the Swan Hills member belongs in the Allanaria allani and Eleutherekomma hamiltoni zones of the middle Waterways formation, and there is a suggestion that part of the Lingula cf. spatulata zone is present in the basal portion.

Deposition of the Swan Hills member was not contemporaneous with that of the Slave Point formation. The apparent homotaxial correlation between these two units southwards is due to progressive onlap of an Upper Devonian sea up onto the Peace River landmass. Strata, coeval with Slave Point type section, thins to the southwest and wedges out.

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