Tetrapod trackways from the early Middle Devonian period of Poland

@article{Niedwiedzki2010TetrapodTF,
  title={Tetrapod trackways from the early Middle Devonian period of Poland},
  author={Grzegorz Niedźwiedzki and Piotr Szrek and K. Narkiewicz and Marek Narkiewicz and Per Erik Ahlberg},
  journal={Nature},
  year={2010},
  volume={463},
  pages={43-48}
}
The fossil record of the earliest tetrapods (vertebrates with limbs rather than paired fins) consists of body fossils and trackways. The earliest body fossils of tetrapods date to the Late Devonian period (late Frasnian stage) and are preceded by transitional elpistostegids such as Panderichthys and Tiktaalik that still have paired fins. Claims of tetrapod trackways predating these body fossils have remained controversial with regard to both age and the identity of the track makers. Here we… 
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