The Polish tetrapod footprints indicate that four-limbed, digit-bearing vertebrates were walking nearly 20 million years earlier than previously thought based on the fossil record.
Sources
- Oldest Land-Walker Tracks Found--Pushes Back Evolution (nationalgeographic.com)
- https://www.cnn.com/2010/WORLD/europe/01/07/tetrapods.poland.evolution.discovery/index.html (cnn.com)
- https://www.nature.com/articles/nature08623 (nature.com)
- https://www.sciencenews.org/article/footprints-could-push-back-tetrapod-origins (sciencenews.org)
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