ABSTRACT: The type section of the Hume Formation (114.6 m), located along the Hume River in western Northwest Territories, is examined in detail for its conodonts and benthic fossils. For the most part it consists of a late Eifelian (early Middle Devonian) kockelianus Zone age, with short intervals of australis and ensensis zones at its base and top, respectively. Three benthic assemblage zones are recognized, in ascending order, Eoschuchertella adoceta, Carinatrypa dysmorphostrota, and Eliorhynchus castanea. The ranges of selected benthic fossils suggest transgression and regression, which are in agreement with three T-R cycles of Johnson, Klapper and Sandberg (1985) and Johnson andKlapper (1992), namely Id, Ie, and If. Cycle Id occurs at the base of the Hume Formation, at contact with the underlying Gossage Formation, and is within the australis Zone. Cycle Ie is about midway in the Hume Formation, within the kockelianus Zone. Cycle If, at the top of the Hume Formation, signals the entry of the ensensis Zone and the Kaak Episode, with the deposition of the overlying Hare Indian Formation.


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