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Permian-Triassic extinction event
The Permian-Triassic (P-T or PT) extinction event, sometimes informally called the Great Dying, was an extinction event that occurred approximately 251.0 million years ago (mya), forming the boundary between the Permian and Triassic geologic periods.
Note: The above text is excerpted from the Wikipedia article "Permian-Triassic extinction event", which has been released under the GNU Free Documentation License.
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March 27, 2025
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