Footprints could push back tetrapod origins | Science News

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Footprints could push back tetrapod origins

Newly discovered trackways much older than previous evidence for sea-to-land transition

By
2:07pm, January 6, 2010

Fossilized footprints found in an abandoned quarry in Poland hint that four-limbed creatures called tetrapods evolved much earlier and in a radically different environment than previously thought.

The footprints — many individual impressions, as well as some arranged in sets called trackways — are preserved in 395-million-year-old rocks in the Holy Cross Mountains, in the southeastern part of the country, paleontologist Per E. Ahlberg and colleagues report in the Jan. 7 Nature. That age substantially predates the time frame that paleontologists have pi

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