Natural.World

• Palaeozoic era
  • - Silurian period
  • - Devonian period
  • - Carboniferous period
  • - Permian period
• Mesozoic era
  • - Triassic period
  • - Jurassic period
  • - Cretaceous period
• Cenozoic era
  • - Tertiary period
  • - Pleistocene epoch
  • - Holocene epoch

Tertiary Period

Part of the Cenozoic era, the Tertiary period is divided into five epochs: Paleocene, Eocene, Oligocene, Miocene, and Pliocene. During this time mammals diversified quickly. Some examples are marsupials, insectivores, bears, hyenas, dogs, cats, seals, walruses, whales, dolphins, early mastodons, hoofed mammals, horses, rhinoceroses, hippopotamuses, oreodonts, rodents, rabbits, monkeys, lemurs, apes, and humans (Australopithecus).

Source: Prehistory.com