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

Cretaceous Period

The is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago (Mya) to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding Cretaceous Period.

Source: Wikipedia