Fossil Evidence for a Late Cretaceous Origin of “Hoofed” Mammals

  title={Fossil Evidence for a Late Cretaceous Origin of “Hoofed” Mammals},
  author={J. David. Archibald},
  pages={1150 - 1153}
Seventeen of eighteen orders of living placental mammals are not known before 65 million years ago. The monophyly of each order is well established, but interrelations have been less certain. A superordinal grouping of up to seven extant orders plus a variety of extinct orders, all included within Ungulata (“hoofed” mammals), can be linked to Late Cretaceous mammals from the 85-million-year-old Bissekty Formation, Uzbekistan (and, less certainly, North America and Europe), thus pushing the… Expand

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