image: Team members Roland Mundil (left) and Bill Mitchell (right) in the laboratory at the Berkeley Geochronology Center, where zircons were dated using the thermal ionization mass spectrometer behind them. 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.” view more
Credit: [Image courtesy of Paul Renne]