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Science 27 July 2007:
Vol. 317. no. 5837, pp. 459 - 460
DOI: 10.1126/science.1145550
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Perspectives

PALEONTOLOGY:
Variation and Early Evolution

Gene Hunt

Trilobite fossils provide evidence for elevated morphological variation during the Cambrian Period.

The author is in the Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012. E-mail: hunte{at}si.edu

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