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Science 24 August 2007:
Vol. 317. no. 5841, pp. 1046 - 1047
DOI: 10.1126/science.1146923
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Perspectives

GEOCHEMISTRY:
The Oldest Fossil or Just Another Rock?

John M. Eiler

Recent evidence strengthens the case for signs of ancient life in rocks from Akilia, Greenland, but important questions remain.

The author is in the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. E-mail: eiler{at}gps.caltech.edu

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