Abstract
Several localities in northeastern Montana, USA, representing the earliest known Palaeocene mammal sites in the world, document a gradual turnover in the mammalian fauna at the Cretaceous–Tertiary boundary. These localities, in combination with previously known latest Cretaceous localities, represent the only well documented terrestrial sequence across the Cretaceous–Tertiary boundary. This sequence argues for gradual terrestrial extinctions and faunal changes at this boundary.
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Archibald, J. The earliest known Palaeocene mammal fauna and its implications for the Cretaceous–Tertiary transition. Nature 291, 650–652 (1981). https://doi.org/10.1038/291650a0
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DOI: https://doi.org/10.1038/291650a0
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