New and Ancient Trace Makers
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Bengtson, Stefan and Rasmussen, Birger. 2009. New and Ancient Trace Makers. Science. 323 (5912): pp. 346-347.
Department of Applied Geology
Faculty of Science and Engineering
WA School of Mines
Trace fossils that are older than known animal fossils may have been formed by large unicellular organisms such as amoebas.