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Science 15 March 2002:
Vol. 295. no. 5562, pp. 2028 - 2029
DOI: 10.1126/science.1070259
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Perspectives

PALEONTOLOGY:
East of Eden at the Paleocene/Eocene Boundary

Chris Beard

About 55 million years ago, a variety of mammals dispersed across the Northern Hemisphere, radically reshuffling the Earth's biota. But where did these predecessors of modern mammals originate? In his Perspective, Beard highlights the report by Bowen et al., whose new geochronological data strengthen the case for Asia as the birthplace of numerous modern groups of mammals, including primates.

The author is in the Section of Vertebrate Paleontology, Carnegie Museum of Natural History, Pittsburgh, PA 15213, USA. E-mail: beardc{at}carnegiemuseums.org

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