Paleozoic Mass Extinction (about 245 MYA)
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The Paleozoic Mass Extinction is also known as the great dying. At the other end of the Paleozoic, the largest mass extinction in history wiped out approximately 90% of all marine animal species. The Permian Period is the final period of the Paleozoic Era. The greatest mass extinction that has ever occurred on earth took place at the end of this 42-million-year period. Its name comes from a region of west-central Russia called Perm Oblast. This is where rocks from this time were first found.