Earth Geological History

By Sandejon1

  • Cambrian

    Cambrian
    Earliest record of Marine life- Trilobites are dominant

  • Ordovician

    Ordovician
    Echinoderms ( starfish, sand dollar, sea urchin and sea cucumbers). Invertebrates are dominant, mollusks become abundant. Earliest Fish that are jawless and later jawed and armored fish.

  • Silurian

    Silurian
    Earliest terrestrial plants and animals. Eurypterids develop

  • Devonian

    Devonian
    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 forming forests. Earliest reptiles. Scale trees and seed ferns.

  • Permian

    Permian
    Extinction of many types of marine animals including trilobites

  • Triassic

    Triassic
    Earliest dinosaurs, abundant cycads and conifers.

  • Jurrasic

    Jurrasic
    Ealiest birds and mammals abundant dinosaurs and ammonites.

  • Cretacious

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

  • Tertiary

    Tertiary
    Earliest Placental Mammals, modern mammals, large running mammals

  • quaternary

    quaternary
    Large Carnivores, Neanderthals, Humans, mastodons