Geologic Timescale

By tbmoney
  • Cambrian 570 - 500 MYA

    Cambrian 570 - 500 MYA
    The Cambrian period, at the beginning of the Paleozoic, was the first time that multicellular life forms flourished on Earth.
  • Period: to

    Geologic Timescale

  • Ordovician 500-435 MYA

    Ordovician 500-435 MYA
    This is the time period where starfish, sandollars, sea urchins, and sea cucumbers flourished. earliest fish as well came into the equation.
  • Silurian 435-395 MYA

    Silurian 435-395 MYA
    Earliest terrestrial plants and animals. Tiktaalik
    Eurypterids develop.
  • Devonian 395-345 MYA

    Devonian 395-345 MYA
    Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites.
  • Carboniferous 345-280 MYA

    Carboniferous 345-280 MYA
    Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns
  • Permian 280-225 MYA

    Permian 280-225 MYA
    Extinction of many types of marine animals including trilobites.
  • Triassic 225-195 MYA

    Triassic 225-195 MYA
    Earliest Dinosaurs, abundant cycads and conifers
  • Jurassic 195-136 MYA

    Jurassic 195-136 MYA
    Earliest birds and mammals abundant dinosaurs and ammonites
  • Cretacious 136-65 MYA

    Cretacious 136-65 MYA
    Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish.
  • Tertiary 65-1.8 MYA

    Tertiary 65-1.8 MYA
    Earliest Placental Mammals, modern mammals, large running mammals
  • Quaternary 1.8 MYA-Present

    Quaternary 1.8 MYA-Present
    Large Carnivores, Neanderthals, Humans, mastodons