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Caption: Team leader Paul Renne collecting a volcanic ash sample from a coal bed within a few centimeters of the dinosaur extinction horizon. This image relates to a paper that appeared in the Feb. 8, 2013, issue of Science, published by AAAS. The paper, by Paul R. Renne at the Berkeley Geochronology Center in Berkeley, CA, and colleagues was titled, "Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary."
Credit: [Image courtesy of Courtney Sprain]
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