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Science 17 May 2002:
Vol. 296. no. 5571, pp. 1215 - 1216
DOI: 10.1126/science.296.5571.1215a
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News of the Week

EVOLUTION:
Did an Impact Trigger the Dinosaurs' Rise?

Richard A. Kerr

A huge asteroid or comet ended the 135-million-year reign of the dinosaurs when it hit Earth 65 million years ago. Now on page 1305, a group of researchers suggests that an impact also triggered the final rise of dinosaurs to dominance 200 million years ago. Proving that an impact is a two-edged sword will depend on demonstrating that a large body hit Earth at the very geologic instant that the dinosaurs' reptilian competitors abruptly died away and meat-eating dinosaurs came into their own.

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