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News Release 13-023
Looking for a 'Smoking Gun' in Dinosaur Die-off
Scientists determine most precise dates yet for dinosaur extinction 66 million years ago
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Rock strata in northeastern Montana; they span the time of the dinosaur extinction.
Credit: Berkeley Geochronology Center
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Scientist Paul Renne collects a sample from a coal bed near the dinosaur extinction level.
Credit: Berkeley Geochronology Center
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Arrows indicate coal beds containing volcanic ash dated in the study.
Credit: Klaudia Kuiper
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Sanidine crystals from the volcanic ash, used to date the boundary.
Credit: Berkeley Geochronology Center
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Geologist Bill Mitchell with a sample; he's just above the dinosaur extinction level.
Credit: Berkeley Geochronology Center
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The research team's results are described in the Feb. 8 issue of the journal Science.
Credit: Copyright AAAS 2013