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Oldest Land-Walker Tracks Found
from National Geographic News
The first vertebrates to walk the Earth emerged from the sea almost 20 million years earlier than previously thought, say scientists who have discovered footprints from an 8-foot-long prehistoric creature.
Dozens of the 395-million-year-old fossil footprints were recently discovered on a former marine tidal flat or lagoon in southeastern Poland.
The prints were made by tetrapods--animals with backbones and four limbs--and could rewrite the history of when, where, and why fish evolved limbs and first walked onto land, the study says.
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