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The most recent and debatably best-known, the CretaceousâPaleogene extinction event, which occurred approximately 66 million years ago (Ma), was a large-scale mass extinction of animal and plant species in a geologically short period of time.
Two other mass extinctions seem to have involved nutrients running into the sea and causing havoc, says Grice: the Great Dying 250 million years ago and the End-Triassic mass extinction 201 million years ago. It's not just the Devonian, she says. Ward's idea is a scary one.