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Caption: Team members Darren Mark (standing) and Leah Morgan analyzing data in their laboratory at the Scottish Universities Environmental Research Center near Glasgow, Scotland, where some of the samples were dated. 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 Ross Dymock]
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