Landbt

Earth's Geologic Timeline

By elizabeth032213

  • Cambrian Period

    Trilabites were dominant. Marine life was abundant. Atmosphere was oxygen rich

  • Ordovician Period 500-435

    Molluscs become abundant. Earliest fish are jawless.

  • Silurian Period 435-395

    Earliest terristorial plants and animals.

  • Devonian Period 395-345

    Amored fish go exstinct. Abundance of fish. Earliest amphibians

  • Carboniferous Period 345-280

    Abundant sharks and amphibians.Largest swamps and forests. Earliest reptiles, scale trees and seed ferns.

  • Permian Period 280-225

    Extinction of many marine animals, even trilobites.
  • Triassic Period 225-195

    Triassic Period 225-195

    Earliest dinosaurs. Abundant cycads and conifers.
  • Jurassic Period 195-136

    Jurassic Period 195-136

    Earliest birds and mammals. Abundant dinosaurs and ammonities.
  • Cretaceous Period 136-65

    Cretaceous Period 136-65

    Earliest flowering plants. Climax f dinosaurs followed by their extinction. Great decline of brachiopads. Abundance of bony fish.
  • Tertiary Period 65-1.8

    Tertiary Period 65-1.8

    Earliest plancental mammals. Modern mammals. Large running mammals.
  • Quaternary Period 1.8-Present

    Quaternary Period 1.8-Present

    Large carnivores. Neanderthals, humans, mastadons.