A group of paleontologists unearthed the most complete fossil of a new species of a famed dome-headed dinosaur to date during a dig in Mongolia.

The team found the pristine skeleton in the Khuren Dukh locality of the Eastern Gobi Basin in Mongolia, which was lined with lakes and cliffs during its prehistoric heyday.

They determined the fossil belongs to a new species of pachycephalosaur dubbed the Zavacephale rinpoche — which they surmise is roughly 108 to 115 million years old, according to their research paper published in Nature on Wednesday. 3

The pachy skeleton is the oldest and most complete specimen of its kind ever uncovered. The team celebrated the find as a “once-in-a-lifetime discovery.”

“It is remarkable for being the oldest definitive pachycephalosaur, pushing back

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