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Mass Extinction Events

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Termini in questo insieme (5)

  • Ordovician-Silurian

    86% of species extinct

    major glaciation and sea level drop

  • Late Devonian

    75% of species extinct

    excess nutrients in aquatic environments, oceanic anoxia

    global cooling, volcanic activity

  • End-Permidian

    96% of species extinct

    Siberian traps - flood basalts that increased heat, CO2 and sulfur dioxide, caused global warming, toxic atmosphere, and acid rain

    Oceans became anoxic and acidic, sea levels dropped

    terrestrial life restricted to low elevation

  • End-Triassic

    80% of species extinct

    Volcanic activity associated with breakup of Pangea

    global climate change

    change in ocean chemistry

  • End-Cretaceous

    75% of species lost

    10km wide asteroid, caused magnitude 9 earthquake globally, massive tsunami and acid rain, ash, soot, and hot gas from impact site.

    Ash in the sky blocked the sun and halted primary productivity, and caused global temp decline.