Paleontologists have discovered the fossilized remains of a previously unknown pachycephalosaur species in Mongolia’s Gobi Desert. “The dome-headed pachycephalosaurians are among the most enigmatic dinosaurs,” said Dr. Tsogtbaatar Chinzorig, a researcher with the Institute of Paleontology at Mongolian Academy of Sciences and North Carolina State University. “Zavacephale rinpoche predates all known pachycephalosaur fossils to date by about 15 million years,” Dr. Chinzorig said. Zavacephale rinpoche fills in huge gaps in the pachycephalosaur timeline — both in terms of when they lived and how they grew. A domed pachycephalosaur from the early Cretaceous of Mongolia.