Evidence that Earth's first mass extinction was caused by critters not catastrophe

Evidence that Earth's first mass extinction was caused by critters not catastrophe
Nashville TN (SPX) Sep 03, 2015 - In the popular mind, mass extinctions are associated with catastrophic events, like giant meteorite impacts and volcanic super-eruptions. But the world's first known mass extinction, which took place about 540 million years ago, now appears to have had a more subtle cause: evolution itself. "People have been slow to recognize that biological organisms can also drive mass extinction," said ... more

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