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The Permian

https://ucmp.berkeley.edu/permian/permian.html

“The Permian period lasted from 290 to 248 million years ago and was the last period of the Paleozoic Era. The distinction between the Paleozoic and the Mesozoic is made at the end of the Permian in recognition of the largest mass extinction recorded in the history of life on Earth. It affected many...” (from the page’s text)

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