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Science 21 November 2003:
Vol. 302. no. 5649, pp. 1314 - 1316
DOI: 10.1126/science.302.5649.1314
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News Focus

MASS EXTINCTION:
Has an Impact Done It Again?

Richard A. Kerr

Researchers claim to have found more proof of a second major impact that triggered a mass extinction. But impact geologists say the newcomers still don't have the right kind of evidence to indict a second killer.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)