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Science 16 January 2009:
Vol. 323. no. 5912, pp. 346 - 347
DOI: 10.1126/science.1168794
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Perspectives

PALEONTOLOGY:
New and Ancient Trace Makers

Stefan Bengtson1 and Birger Rasmussen2

Trace fossils that are older than known animal fossils may have been formed by large unicellular organisms such as amoebas.

1Nordic Center for Earth Evolution and Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden. E-mail: stefan.bengtson{at}nrm.se

2Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.

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