Mass Extinction

  • 440

    Ordivician mass extinction

    Ordivician mass extinction
    occured 440-450 Ma
    secondmost devastating extinction
    2/3 of all life ceased to exist in oceans and seas
    caused by glaciation of Gondwana which lowered the sea level globally(global cooling)
  • Nov 8, 650

    Permian Mass extinction

    Permian Mass extinction
    252.28 Ma
    known as the Great Dying
    -96% all marine species
    -70% of terrestitrial vertebrate
    -57% of all families and 83% of all genera became extinct
    -due to the massive loss of biodiversity, recovery of life on Earth took significantly longer than any other extinction event: 10 million years
    -3 phases of extinction from gradual environment change:
    asteroid, volcanism, methane hydrate gasification, sea level fluctuations, anoxia, hydrogen sulfide emissions, super continent of Pangaea
  • Nov 8, 700


    -occurred 201.3 million years ago
    -20% of all marine families disappeared. On land, all large crurotarsans (non-dinosaurian archosaurs) other than crocodilians, some remaining therapsids, and many of the large amphibians were wiped out.
    -Theories as to how it happened:
    climate change, asteroid impact, massive volcanic eruptions
  • Devonian

    The Devonian period ranged from 408-360 million years ago. Mass extinction occured in Devonian by a metorite that impacted at the Frasian boundary. Devonian also included insects, plants, and also forests. 19% of families and 50% of genera were wiped out which means the total is 70% together were wiped out from the extinction.
  • Cretaceous Mass Extinction

    Cretaceous Mass Extinction
    -Occurred 66 million years ago.
    -three quarters of plant and animal species on Earth -including all non-avian dinosaurs- 75% or more of all species were wiped out by the K–Pg extinction
    -K-Pg event
    -Evidence of extinction: Chicxulub crater in the Gulf of Mexico