New and Ancient Trace Makers

@article{Bengtson2009NewAA,
  title={New and Ancient Trace Makers},
  author={Stefan Bengtson and Birger Rasmussen},
  journal={Science},
  year={2009},
  volume={323},
  pages={346 - 347}
}
Trace fossils that are older than known animal fossils may have been formed by large unicellular organisms such as amoebas. 

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