The mass extinction in the geologic record, which proved to be the most devastating to life on Earth, occurred at the end of the ____.

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The most devastating mass extinction in the geologic record occurred at the end of the Permian period, approximately 251 million years ago. This event is known as the Permian-Triassic extinction and is estimated to have caused the loss of 70% of land species and 96% of marine species.

The Mass Extinction in the Geologic Record, Which Proved to Be