Permian–Triassic extinction event
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The Permian–Triassic (P–Tr) extinction event, informally known as the Great Dying,[2] was an extinction event that occurred 252.28 Ma (million years) ago,[3] forming the boundary between the Permian and Triassic geologic periods, as well as the Paleozoic and Mesozoic eras. It is the Earth's most severe known extinction event, with up to 96% of all marine species[4] and 70% of terrestrial vertebrate species becoming extinct.[5] It is the only known mass extinction of insects.[6][7] Some 57% of all families and 83% of all genera became extinct. Because so much biodiversity was lost, the recovery of life on Earth took significantly longer than after any other extinction event,[4] possibly up to 10 million years.[8] This event has been described as the "mother of all mass extinctions.
