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Oldest 'Footprints' on Earth Found
http://news.yahoo.com/s/livescience/oldestfootprintsonearthfound
Oldest 'Footprints' on Earth Found
http://news.yahoo.com/s/livescience/oldestfootprintsonearthfound
Much of the N. American continent was underwater during the distant past.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 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. Scientists said today that the animal must have stepped lightly onto the soft marine sediment, because its legs only pressed shallow pinpoints into that long-ago sea bed.
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