Abstract
Vertebrate coprolites are common in the Upper Triassic Chinle Group of the western United States. Two new ichnotaxa (Dicynodontocopros maximus, Het‐eropolacopros texaniensis, both ichnogen. and ichnosp. nov.) have stratigraphic ranges restricted in the late Carnian. Heteropolacopros occurs throughout the Oti‐schalkian and Adamanian whereas Dicynodontocopros is restricted to the Adamanian. Coprolite acme zones occur in the upper Carnian, lower Norian and Rhaetian portions of the Chinle Group. The distribution of some Chinle Group coprolites is facies controlled.
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