Evolutionary Tempo and Mode of Triceratops from the Uppermost Maastrichtian Frenchman Formation of Southern Saskatchewan

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  • Previous work regarding the upper Maastrichtian Hell Creek Formation of Montana has hypothesized that two temporally separated species of Triceratops were anagenetically related, with the older T. horridus having directly given rise to the younger T. prorsus. I tested this hypothesis against two alternatives using Triceratops from the Frenchman Formation, which had not been systematically studied prior to my investigation. Using qualitative comparisons, linear discriminant analyses, and hierarchal cluster analyses I classified all specimens as T. prorsus, validating the previous hypothesis. Additionally, I relocated and provided stratigraphic data for six Triceratops specimens from the Frenchman Formation. I found no preference in depositional environment, with specimens equally distributed in both sand and mudstone facies. When relatively dated against each other, I found no trends in morphology had occurred across the latest Maastrichtian, suggesting the species may have been in evolutionary stasis prior to its extinction at the end of the Cretaceous.

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  • 2022


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