Identified conodonts from the early Middle Ordovician Fort Pena Formation of the Marathon basin, West Texas, belong to 58 species of 30 genera. Two new genera, Oistodella and Tripodus, and 8 new species are proposed. The fauna contains elements found in the Pratt Ferry Formation of Alabama, the Joins Formation of Oklahoma, the Martinsburg Formation of New Jersey and the Pogonip Group of Nevada. It also has species in common with the Crassicauda Limestone of Sweden, the Ampyx Limestone of Norway, and with Ordovician shale and chert units in Scotland.

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