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What happened to the sulfur from the Chicxulub impact? See 🧵 to find out how @azerkle, @jdwitts, Mark Claire, Linda Ivany, Tom Yancey, Chegjie Liu and I show in pnas.org/doi/10.1073/pn… that stratospheric sulfur was central to cooling and the K-Pg extinction. Img © J. McKay CC

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