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Sequences of Permian samples from the western United States include specimens of most species described from single samples from Greenland, Germany, Sicily, Greece, Pakistan, and China. Wolf-campian collections from Nevada and Utah include abundant Idio-gnathodus, some Adetognathus and “Gnathodus,” and representatives of a few Gondolella species. Two assemblage zones are recognized in the Nevada Riepe Springs and Riepetown Formations (Wolfcampian) ; the Idiognathodus ellisoni Assemblage Zone in the lower part and the Gondolella bisselli-Spathognathodus whitei Assemblage Zone in the upper part. Elements of the faunas of these zones have been reported from the Kansas Big Blue Group and the Wyoming...

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