Geology Timeline

By nikkim17
  • Cambrian Period

    Cambrian Period

    earliest records of marine life- trilobites are dominant
  • Ordovician Period

    Ordovician Period

    starfish, sandollar, sea urchin and sea cuccumbers. invertebrates are dominant, mollusks became ubundant. the earliest fish are jawless and later jawed and armored fish
  • Silurian Period

    Silurian Period

    Earliest terrestrial plants and animals tiktaalik eurypterids develop
  • Devonian Period

    Devonian Period

    armored fish go extinct but abundance of several species of fish. Earliest amphibians and ammonites
  • Carboniferous

    Carboniferous

    abundant sharks and amphibians. large swamps and coal forests
  • Permian period

    Permian period

    extinction of many species of marine life including trilobites
  • Triassic Period

    Triassic Period

    Earliest dinosaurs, abundant cyclads and conifers
  • Jurassic Period

    Jurassic Period

    Earliest birds and mammals and abundant dinosaurs and ammonites
  • Cretaceous Period

    Cretaceous Period

    Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline in brachiopods and an abundance of bony fish
  • Tertiary Period

    Tertiary Period

    earliest placental mammals, large running mammals, and modern mammals
  • Quaternary Period

    Quaternary Period

    large canivors, mammals, neanderthals, humans, mastodons