Mercury levels support volcanic role in end-Cretaceous extinction

The end-Cretaceous extinction, known for finishing off the last dinosaurs about 66 million years ago, often evokes scenes of a large asteroid hurtling toward Earth. However, new evidence supports a growing consensus that the massive bolide wasn’t the only hazard that life on Earth had to contend with: A prolonged bout of major volcanic eruptions was also spewing climate-altering gases and other emissions such as mercury into the atmosphere.

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Elizabeth Goldbaum

Goldbaum is a freelance science writer based in Washington, D.C.

Thursday, April 28, 2016 - 06:00

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