Extinction by a Whoosh, Not a Bang?

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Science  21 Nov 2003:
Vol. 302, Issue 5649, pp. 1315
DOI: 10.1126/science.302.5649.1315

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A new study has fingered the largest volcanic eruption ever as the leading cause of the greatest mass extinction 251 million years ago, but a second study in this issue of Science (p. 1392) seems to diminish vastly the role of another great eruption in the death of the dinosaurs.