Geo. Timeline

By wattsromel

  • Paleozoic Ordovician

    Echinoderms( Starfish, Sand dollar, sea urchin and sea cucumbers). Invertebrates are dominant, mollusks become abundant. Earliest fish that are jawless and later, and jawed and armored fish

  • Paleozoic Cambrian

    Earliest Record of marine life - Trilobites are dominant

  • Paleozoic Silurian

    Earliest terrestrial pants and animals. Tiktaalik Eurypterids develope

  • Mesozoic periods Trassic

    Earliest Dinosaurs, abundant cycads and conifers

  • Paleozoic Carboniferous

    Abundant sharks and amphibians. Large swamps and coal forming forest. Earliest reptiles. Scales trees and seed ferms.

  • Paleozoic Permian

    Extinction of many types of marine animals including trilobites

  • Mesozoic Jurassic

    Earliest birds and mammals abundant dinosaurs and ammonites

  • cenozoic Teritary

    Earliest Placental mammals, modern mammals, large running mammals

  • Cenozoic

    Large Carnivores, Neanderthals, human, mastodons

  • Mesozoic Cretaceous

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