The Permian-Triassic Extinction

The Permian-Triassic Extinction
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Details of The Permian-Triassic Extinction

About The Permian-Triassic Extinction
The Permian-Triassic Extinction- Article by Andrew Alden proposing that new evidence and old, both support a volcanic explanation for this mass extinction when nine tenths of all species disappeared.
Paleozoic