Geologic Timeline

By sevin

  • Cambrian- 570-500 MYA

    Earliest record of marine life, Trilobites are dominant.
  • Period: to

    Geological Timeline

  • Ordovician- 500-435 MYA

    Echinoderms come into existance, Invertebrates are dominant, mollusks become abundant, earliest jawless fish, and later jawed and armoured fish.

  • Silurian- 435-395 MYA

    Earliest terrestrial plants and animals, Tiktaaliks and Eurypterids develop.

  • Devonian- 395-345 MYA

    Armoured fish go extinct, abundance of several species of fish, Earliest amphibians and ammonites.

  • Carboniferous- 345-280 MYA

    Abundance of sharks and amphibians, large swamps and forrests. Earliest reptiles, scale trees, and seed ferns.

  • Permian- 280-225 MYA

    Extinction of many types of marine animals, including Trilobites.

  • Triassic- 225-195 MYA

    Earliest dinosaurs, abundant cycads and conifers.

  • Jurassic- 195-136 MYA

    Earliest birds and mammals, adundace of dinosaurs and ammonites.

  • Cretaceous- 136-65 MYA

    Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of crachiopods. Abundance of bony fish.

  • Tertiary- 65-1.8 MYA

    Earliest placental mammals, modern mammals, and large running mammals.

  • Quaternary- 1.8 MYA- Present

    Large carnivores, neanderthals, and humans.