Fossil Evidence for a Late Cretaceous Origin of "Hoofed" Mammals

  title={Fossil Evidence for a Late Cretaceous Origin of "Hoofed" Mammals},
  volume={272 5265},
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… CONTINUE READING