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Terrestrial Origins and Evolution
Bilaterian fossil
06/29/12

 

University of Alberta geologists found these tracks of the earliest animal life form ever discovered. Bilaterians, centimetre-long slug-like animals, left their mark 585 million years ago in shallow-water silt in what is now Uruguay. The U of A find predates all previous evidence of "first" animal life on Earth by 30 million years. Credit: Richard Siemens



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