Late Tournaisian? teeth and spines of the chondrichthyan genera Orodus, Helodus, Deltodus, Leiodus, Petalorhynchus, and ?Polyrhizodus are illustrated. The nature of the assemblage and the host limestone (Livingstone Formation, southwestern Alberta) indicates a predominance of durophagous, bottom living chondrichthyans, feeding on hard-shelled invertebrates in a shallow marine, high energy, carbonate bank environment.

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