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Neither phylogenomic nor palaeontological data support a Palaeogene origin of placental mammals.
(2014-01)
O'Leary et al. (O'Leary et al. 2013 Science 339, 662-667. (doi:10.1126/science.1229237)) performed a fossil-only dating analysis of mammals, concluding that the ancestor of placentals post-dated the Cretaceous-Palaeogene ...