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New 110-Million-Year-Old Pachycephalosaur Fossil Discovered in Mongolia

10/24/2025

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Summary

Story summary

Paleontologist Chinzorig Tsogtbaatar announced the discovery of Zavacephale rinpoche, a new pachycephalosaur from southeast Mongolia dating to about 110 million years ago, the oldest known member of its group.
The specimen is the most complete pachycephalosaur skeleton ever found.
It features a dome-shaped skull.
The fossil, excavated in 2019, was analyzed in North Carolina in 2022.
The fossil is housed at the Institute of Paleontology in Mongolia, aiding pachycephalosaur evolution.

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Story summary

Paleontologist Chinzorig Tsogtbaatar announced the discovery of Zavacephale rinpoche, a new pachycephalosaur from southeast Mongolia dating to about 110 million years ago, the oldest known member of its group.
The specimen is the most complete pachycephalosaur skeleton ever found.
It features a dome-shaped skull.
The fossil, excavated in 2019, was analyzed in North Carolina in 2022.
The fossil is housed at the Institute of Paleontology in Mongolia, aiding pachycephalosaur evolution.