News FocusGeochemistry

In Mass Extinction, Timing Is All

Science  17 Sep 2004:
Vol. 305, Issue 5691, pp. 1705
DOI: 10.1126/science.305.5691.1705

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On page 1760 of this issue of Science, a new, apparently improved, way to date the greatest mass extinction points to a volcanic cause but fails to resolve geochronologists' long-running differences.