Ferruginous coprolites associated with the Whitemud Formation (Late Cretaceous) exposures in south-central Saskatchewan represent both the expelled and unexpelled faeces of a large nonmarine fish, possibly a sturgeon. The physico-chemical controls on the plasticity of the faeces at the time of expulsion and the mode of preservation of the faeces during diagenesis minimizes the utility of binomial ichnological classification for coprolites.

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