Fossil footprints discovered in southeastern Poland are 395 million years old, making them the oldest known tetrapod tracks and the oldest evidence of true tetrapods.
Notes on verification
Confirmed by peer-reviewed Nature publication (Niedźwiedzki et al. 2010) and corroborated by multiple reputable science news outlets (Science, CNN, Earth Magazine). Findings pushed back tetrapod evolution timeline significantly and have been widely cited in paleontology literature. [tier=gold indep_score=0.988 clusters=4 claim_tier=notable]
Sources
- Oldest Land-Walker Tracks Found--Pushes Back Evolution (seed:science_and_space)
- https://www.cnn.com/2010/WORLD/europe/01/07/tetrapods.poland.evolution.discovery/index.html (corroboration)
- https://www.nature.com/articles/nature08623 (corroboration)
- https://www.science.org/content/article/ancient-four-legged-beasts-leave-their-mark (corroboration)
- https://www.earthmagazine.org/article/tetrapod-tracks-reset-timing-four-legged-evolution/ (corroboration)