Mass extinction

By Trystan23
  • 1 BCE

    Ordovician

    Ordovician
    439 million years ago
    A: Sea level falling and the onset of glaciation
    B: 99.9 percent disappeared
    C graptolites, trilobites, brachiopods, and the conodonts
    D Sea level fell then glaciers formed and the sea level rose melting the glaciers.
  • 2

    Denovian

    Denovian
    Denovian
    A 364 million years ago
    B Don’t know the exact cause but feel think that it had a similar episode like the ordovician
    C Goniatites, Coral, brachiopods
    D Warm climate temperature and global warming mixed with sea level falling and rising
  • 3

    Permian

    Permian
    A 251 million years ago
    B Direct evidence for this period has not been found but many scientists believe a comet or asteroid impact led to this extinction. Others think that volcanic eruption, coating large stretches of land with lava from the Siberian Traps
    C 95% of all species died
    D Insects vertebrae land animals and marine animals
    E climate is unknown
  • 4

    Triassic

    Triassic
    199 million years ago
    A most likely caused by massive floods of lava erupting from the central Atlantic magmatic province triggering the breakup of Pangaea and the opening of the Atlantic Ocean
    B 52% of marine animals and an unknown percent of vertebrae
    C marine animals and vertebrae
    D warm from global warming caused by volcanism
  • 5

    Cretaceous

    Cretaceous
    65 million years ago
    A , if not caused, by impacts of several-mile-wide asteroid that created the Chicxulub crater now hidden on the Yucatan Peninsula and beneath the Gulf of Mexico. Yet, some scientists believe that this mass extinction was caused by gradual climate change or flood-like volcanic eruptions of basalt lava from the Deccan Traps in west-central India.
    B Butterflys “Flowers pods”, dinosaurs
    C 18% of land vertebrae
    D: Flood like with many volcanic explosions