Earliest Animal Footprints Ever Found -- Discovered in Nevada

The fossilized trail of an aquatic creature suggests that animals walked using legs at least 30 million years earlier than had been thought. The tracks -- two parallel rows of small dots, each about 2 millimeters in diameter -- date back some 570 million years, to the Ediacaran period.

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<p><a href="http://www.physorg.com/news142431582.html">Earliest Animal Footprints Ever Found -- Discovered in Nevada</a></p> <p>The fossilized trail of an aquatic creature suggests that animals walked using legs at least 30 million years earlier than had been thought. The tracks -- two parallel rows of small dots, each about 2 millimeters in diameter -- date back some 570 million years, to the Ediacaran period.</p>