Geologic Time Scale

By ryanbraman11

  • Cambrian 570-500 MYA

    Cambrian 570-500 MYA
    Cambrian period, beggining of pelozoic, first time multicellulas life forms flourished on Earth.
  • Period: to

    Geologic Time Scale

  • Ordovician 500-435 MYA

    Ordovician 500-435 MYA
    Echinoderms ( starfish, sand dollar, sea urchin and sea cucumbers.) Invertebrates are dominant, mollusks becom abundant. Earliest fish are jawless and later, jawed and armored fish.

  • Silurian 435-395 MYA

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

  • Cretaceous 136-65 MYA

    Cretaceous 136-65 MYA
    Earliest flowering plants, climax of dinosaurs, followed by their extinction. Great decline of branchiopads. 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-Present

    Quaternary 1.8-Present
    Large Carnivores, Neanderthals, Humans, Mastodons.