Research Highlights |
Featured
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News |
Sea stars suck up carbon
Much more carbon is sequestered by echinoderms than previously thought.
- Matt Kaplan
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Article |
Tetrapod trackways from the early Middle Devonian period of Poland
The earliest body fossils of tetrapods (vertebrates with limbs rather than paired fins) date to the Late Devonian period. There have been claims of tetrapod trackways predating these body fossils but the age and identity of the track makers have remained controversial. The discovery of well-preserved and securely dated tetrapod tracks from Polish marine tidal flat sediments of early Middle Devonian age, around 18 million years older than the earliest tetrapod body fossils, is now presented.
- Grzegorz Niedźwiedzki
- , Piotr Szrek
- & Per E. Ahlberg
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News & Views |
Muddy tetrapod origins
The tracks left by organisms are among the most difficult of fossils to interpret. But just such evidence puts debate about the origins of four-limbed vertebrates (which include ourselves) on a changed footing.
- Philippe Janvier
- & Gaël Clément
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News |
Discovery pushes back date of first four-legged animal
But controversy surrounds 400-million-year-old fossilized tracks.
- Rex Dalton
