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A Coinciding Asteroid and Extinction? (4 of 7)

Caption: Rock layers near Jordan, Montana, exposing the level (lower arrow) where the dinosaurs and many other animals and plants went extinct. The arrows point to coal beds which contain thin volcanic ash layers that 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 Klaudia Kuiper]

Usage Restrictions: Please cite the owner of the image when publishing. This image may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission.

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