The largest extinction, measured as a percentage of species that disappeared, occurred at the end of which geological period?

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The end-Permian extinction, also known as the Permian-Triassic extinction event, occurred about 252 million years ago and is estimated to have caused the disappearance of up to 96% of all marine species and 70% of land species. This is the largest extinction event in Earth's history when measured as a percentage of species that disappeared.

The Largest Extinction, Measured as a Percentage of Species That