Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary
@article{Wible2007CretaceousEA, title={Cretaceous eutherians and Laurasian origin for placental mammals near the K/T boundary}, author={J. Wible and G. W. Rougier and M. Novacek and R. Asher}, journal={Nature}, year={2007}, volume={447}, pages={1003-1006} }
Estimates of the time of origin for placental mammals from DNA studies span nearly the duration of the Cretaceous period (145 to 65 million years ago), with a maximum of 129 million years ago and a minimum of 78 million years ago. Palaeontologists too are divided on the timing. Some support a deep Cretaceous origin by allying certain middle Cretaceous fossils (97–90 million years old) from Uzbekistan with modern placental lineages, whereas others support the origin of crown group Placentalia… CONTINUE READING
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