Debate has raged about what killed the dinosaurs. A new study might put that to rest.
Her research, published Thursday in the peer-review journal Science, suggests that the toxic gasses started spewing sometime between 350,000 and 200,000 years before the asteroid impact.
"They changed in response to warming, but they changed back again prior to the impact," Hull said."It really leads us to say 'well hey its the impact that drives the extinction and the volcanic warming and cooling is happening, but it’s not contributing to what we’re seeing right at the boundaries.'"
Researchers have wondered for years why there was no global warming event after this second outgassing, and Hull's research led her to the answer: The mass extinction caused by the asteroid altered the carbon cycle so much that it absorbed the volcanic emissions.
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