Geologic Timescale

By scruffysaurus
  • Cambrian Period- 570 – 500 MYA

    Cambrian Period- 570 – 500 MYA

    first fish. end with an extinction. trilobites are dominant
  • Ordovician Period- 505 mya

    Ordovician Period- 505 mya

    animals with backbones appear 500my. under water
  • Silurian Period-438 mya

    Silurian Period-438 mya

    first land plants. first jawed fishes. first insects
  • Devonian Period-408 mya

    Devonian Period-408 mya

    first amphibians. fist tetrapds. ends with an extinction
  • Carboniferous Period-360 mya

    Carboniferous Period-360 mya

    first reptiles. coal-forming swamps
  • Permian Period-286 mya

    Permian Period-286 mya

    formation of Appalachians then Pangaea forms. Permian ends with MASS extinction
  • Triassic Period- 245 mya

    Triassic Period- 245 mya

    first dinosaurs, Pangaea cracks 200my, then first mammals
  • Jurassic Period- 208 mya

    Jurassic Period- 208 mya

    first birds. S. America & Africa split. Watchung Mts. first mammals.
  • Cretaceous Period-144 mya

    Cretaceous Period-144 mya

    modern look to world. rockies form. then Dino extinct. India broke off.
  • Tertiary Period- 66 - 5.3 mya

    Tertiary Period- 66 - 5.3 mya

    First large mammals. Alps then Himalayas as india crashes. Modern-looking Earth 40 my
  • Quaternary Period- 1.6 - .01 mya

    Quaternary Period- 1.6 - .01 mya

    Earliest Humans, then ice age. ice age creates lakes such as Yosemite