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Through analysis of sulfur isotopes, researchers showed that Earth’s largest mass extinction event didn’t wipe out life on land with a single massive volcanic event. Rather, the die-offs happened regionally and progressively over hundreds of thousands of years

In a new study appearing in the Proceedings of the National Academy of Sciences, UC Davis researchers challenge the idea that the volcanic eruptions triggered a single global, environmental collapse all at once. Rather, the devastation and environmental collapse on land happened regionally and in stages.

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