Dome-headed dinosaur from Mongolia is the oldest ever found

A fossil from about 108 million years ago reveals an early member of the pachycephalosaurs, a group of dinosaurs with bizarre protrusions on their skulls that may have been used in combat

​A fossil from about 108 million years ago reveals an early member of the pachycephalosaurs, a group of dinosaurs with bizarre protrusions on their skulls that may have been used in combat A fossil from about 108 million years ago reveals an early member of the pachycephalosaurs, a group of dinosaurs with bizarre protrusions on their skulls that may have been used in combat