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        Part of Evolution Series
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        Permian-Triassic Extinction

        Geologist Peter Ward shows rock layers laid down during the Permian and Triassic periods, in this video segment from Evolution: Extinction! The Permian layers contain abundant animal fossils and fossilized traces of animals, while the Triassic layers are almost devoid of fossils, suggesting a mass extinction event occurred 250 million years ago, at the end of the Permian.

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