Using various dating techniques, researchers conducted genome-scale analysis on more than 4,000 genes from 82 mammalian species, and found that placental mammals likely experienced continuous diversification throughout the Cretaceous-Paleogene (KPg) extinction, a finding that is not only increasingly consistent with the fossil record but also suggests that the KPg mass extinction event had little effect on the diversification of placental mammals.
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Article #16-16744 : "Genomic evidence reveals a radiation of placental mammals uninterrupted by the KPg boundary," by Liang Liu et al.
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Proceedings of the National Academy of Sciences