Geologic Timescale

By wlaughlin

  • Cambrian Period-570-500MYA

    Cambrian Period-570-500MYA
    Earliest marine life recorded. Abundant amount of Trilobites.

  • Ordovician-500-435MYA

    Ordovician-500-435MYA
    Starfish, sand dollars, and jawed armor fish.

  • Silurian-435-395-MYA

    Silurian-435-395-MYA
    Earliest terrestrial plants and animals.

  • Devonian-395-345MYA

    Devonian-395-345MYA
    Armored fish go extinct.

  • Carboniferous-345-280MYA

    Carboniferous-345-280MYA
    Abundant sharks and amphibians

  • Permian-280-225MYA

    Permian-280-225MYA
    Extinction of many marine animals.

  • Triassic-225-195MYA

    Triassic-225-195MYA
    Early dinosaurs. Cyads and Conifers.

  • Jurassic-195-136MYA

    Jurassic-195-136MYA
    Earlleist birds and mammals. Abundant dionosaurs and ammonites.

  • Cretaceous-136-65MYA

    Cretaceous-136-65MYA
    Climax of dinosaurs followed by the extinction of fish.

  • Tertiary-65-1MYA

    Tertiary-65-1MYA
    non-avian dinosaurs in the Cretaceous–Tertiary extinction event,

  • Quaternary

    Quaternary
    The climate was one of periodic glaciations with continental glaciers moving as far from the poles as 40 degrees latitude.