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uruguay fossil 6 29 2012

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Fossil find proves complex life on earth 30 million years older than thought
Fossilized tracks of slug-like creature found in Uruguay estimated at 585 million years old.
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uruguay fossil 6 29 2012

The fossil of a mesosaurus — an aquatic reptile — is seen on April 11, 2012 in Pinamar, Uruguay.

PABLO PORCIUNCULA
AFP/Getty Images