Permian Triassic extinction event Wikipedia the free encyclopedia

Live from the Phanerozoic: Sarda Sahney and Michael J Benton (2008): Recovery from the Most Profound Mass Extinction of All Time:

The end-Permian mass extinction, 251 million years (Myr) ago, was the most devastating ecological event of all time....

Ecosystems were destroyed worldwide, communities were restructured and organisms were left struggling to recover. Disaster taxa, such as Lystrosaurus, insinuated themselves into almost every corner of the sparsely populated landscape in the earliest Triassic, and a quick taxonomic recovery apparently occurred on a global scale. However, close study of ecosystem evolution shows that true ecological recovery was slower.... Taxonomic diversity at the alpha (community) level did not recover to pre-extinction levels; it reached only a low plateau after each pulse and continued low into the Late Triassic. Our data showed that though there was an initial rise in cosmopolitanism after the extinction pulses, large drops subsequently occurred and, counter-intuitively, a surprisingly low level of cosmopolitanism was sustained through the Early and Middle Triassic...

See also: https://en.wikipedia.org/wiki/Permian–Triassic_extinction_event

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