The oldest-known tracks of a creature apparently using legs have been discovered in rock dated to 570 million years ago in what was once a shallow sea in Nevada.
Scientists think land beasts evolved from ancient creatures that left the sea and evolved lungs and legs.
If the new finding is real — the discoverer says it will fuel skepticism — it pushes the advent of walking back 30 million years earlier than any previous solid finding.
The aquatic creature left its "footprints" as two parallel rows of small dots, each about 2 millimeters in diameter.
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# Posted by Michelle Moran @ |
Monday, October 06, 2008