Geologic Timescale

By Noah Morgan
  • 65

    Tertiary (65-1.8 MYA)

    Tertiary (65-1.8 MYA)
    Earliest placental mammals , modern mammal, large running mammals
  • 136

    Cretaceous (136-65 MYA)

    Cretaceous (136-65 MYA)
    Earliest flowering plants and brachiopods
  • 195

    Jurassic (195-136 MYA)

    Jurassic (195-136 MYA)
    Earliest birds and mammals. Abundant dinosaurs and ammonites
  • 225

    Triassic (225-195 MYA)

    Triassic (225-195 MYA)
    Earliest dinosaurs , abundant cycads and conifers
  • 280

    Permian (280-225 MYA)

    Permian (280-225 MYA)
    Extinction of many types of marine life including trilobites
  • 345

    Carboniferous (345-280 MYA)

    Carboniferous (345-280 MYA)
    Abundant sharks and amphibians. Large swamps an coal forming forests
  • 395

    Devonian (395-345 MYA)

    Devonian (395-345 MYA)
    Armored fish go extinct besides a few other species of fish
  • 435

    Silurian (435-395 MYA)

    Silurian (435-395 MYA)
    Earliest terrestrial plants and animals
  • 500

    Ordovician (500-435 MYA)

    Ordovician (500-435 MYA)
    Invertebrates are dominant. Mollusks become abundant as well as fish (jawed and armored)
  • 570

    Cambrian (570-500 MYA)

    Cambrian (570-500 MYA)
    Earliest record of marine life and trilobites are dominant

  • Quaternary (1.8 MYA - Present)

    Quaternary (1.8 MYA - Present)
    Large carnivores, neanderthals, humans, mastodons