A thin bed in the Minturn has 30 species in 13 genera of conodonts, many fish plates and teeth, and small Foraminifera. Comparison with midcontinent forms suggests middle or late Desmoinesian age for the fauna. Ten new species are described: Diplododella plana, Hibbardella acuta, H. obtusa, Hindeodella multidenticulata, H. megadenticulata, Idiognathus meekerensis, Lonchodina megacuspata, L. singularis, Metalonchodina fragilis and Spathognathodus coloradoensis.

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