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Fern spike

Fern spike

Geologically-rapid increase in fern abundance after extinction events.

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  1. Fern

    Class of vascular plants.

    45%

  2. Triassic–Jurassic extinction

    Mass extinction ending the Triassic period.

    15%

  3. Permian–Triassic extinction event

    Earth's most severe extinction event.

    14%

  4. Cretaceous–Paleogene extinction event

    Mass extinction event about 66 million years ago.

    13%

  5. 1980 eruption of Mount St. Helens

    Major volcanic eruption in Skamania County, Washington.

    6.7%

  6. El Chichón

    Volcano in Chiapas, Mexico.

    6.7%

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  1. Cretaceous–Paleogene extinction event

    Mass extinction event about 66 million years ago.

    77%

  2. Fern

    Class of vascular plants.

    23%