Zavacephale rinpoche is the oldest known pachycephalosaur, dating to roughly 108 million years ago.
Sources
- Dome-headed dinosaurs are rare. Scientists just found the most ... (nationalgeographic.com)
- https://www.nature.com/articles/s41586-025-09213-6 (nature.com)
- https://news.ncsu.edu/2025/09/teen-pachycephalosaur-butts-into-fossil-record/ (news.ncsu.edu)
- https://www.sci.news/paleontology/zavacephale-rinpoche-14223.html (sci.news)
- https://www.scientificamerican.com/article/oldest-known-pachycephalosaur-fossil-discovered-in-mongolia/ (scientificamerican.com)
- https://www.nhm.ac.uk/discover/news/2025/september/new-dome-headed-dinosaur-most-complete-ever-found.html (nhm.ac.uk)
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