New Gobi Desert fossil reveals oldest pachycephalosaur, rewriting dinosaur history

A new fossil discovery in the Gobi Desert reveals the oldest and most complete pachycephalosaur, pushing back the known fossil record of these dinosaurs by 15 million years. Named Zavacephale rinpoche, the juvenile specimen dates to 108 million years ago and provides crucial insights into the early evolution and cranial dome development of these iconic plant-eating dinosaurs. This well-preserved fossil offers a rare glimpse into pachycephalosaur anatomy, including their hands and the use of stomach stones, reshaping understanding of their biology and behavior.