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Science 26 March 1999:
Vol. 283. no. 5410, pp. 1989 - 1990
DOI: 10.1126/science.283.5410.1989a
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News of the Week

PALEONTOLOGY:
Fossil Offers a Glimpse Into Mammals' Past

Carl Zimmer

A paleontologist from the National Geological Museum of China has unearthed the world's oldest complete mammal fossil, dating back at least 120 million years. In this week's issue of Nature, the researcher and his colleagues conclude that the fossil, a rat-sized chimera with mammalian front legs and splayed reptilian hindlegs, is a close relative to the common ancestor of all mammals alive today.

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