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