About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...

About 252 million years ago, upward of 80% of all marine species vanished during the end-Permian mass extinction—the most extreme event of its kind in Earth's history. What followed was a ...

However, clams took over the oceans in the aftermath of the end-Permian extinction, along with oysters, snails, and slugs. Earth’s largest mass extinction eliminated a lot of marine species. But it ...

The Permian extinction saw the loss of 80 to 96 percent of all marine species. In the Cretaceous event, perhaps 60 to 75 percent of marine species disappeared. What caused these immense die-offs?

Scientists don't call it the "Great Dying" for nothing. About 252 million years ago, upward of 80% of all marine species vanished during the end-Permian mass extinction – the most extreme event of its ...

The end-Permian extinction, triggered by massive volcanic eruptions ... The extinction rate of plant species in this region was only 21%, far lower than the massive losses observed in the oceans, ...