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Caption: Ph.D. student Bill Mitchell collecting a volcanic ash sample from the coal bed just above the final dinosaur extinction level. 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 Paul Renne]
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