The Geologic Time Scale

By tshanda

  • Cambrian 570-500 MYA

    Cambrian 570-500 MYA
    Earliest Record of marine life.
  • Period: to

    The Geologic Time Scale

  • Ordovician 500-435 MYA

    Ordovician 500-435 MYA
    Invertebrates are dominant. Mollusks become abundunt, Earliest fish are jawless, and later jawed and armored fish.

  • Silurian 435-395 MYA

    Silurian 435-395 MYA
    Earliest terrestrial plants and animals.

  • Devonian 395-345 MYA

    Devonian 395-345 MYA
    Armored fish go extinct. Abundance of several species of fish.

  • carboniferous 345-280 MYA

    carboniferous 345-280 MYA
    abundant sharks and amphibians. Large swamps and coal forming forests.

  • Permian 280-225 MYA

    Permian 280-225 MYA
    extinction of many types of marine life such as trilobites

  • Triassic 225-195 MYA

    Triassic 225-195 MYA
    earliest dinosaurs, abundant cyads and conifers.

  • Jurrasic 195-136 MYA

    Jurrasic 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 following 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 animals.

  • Quaternary 1.8 MYA-Present

    Quaternary 1.8 MYA-Present
    large carnivors and, neanderthals, humans, and mastodons.