A dome-headed dinosaur skull found in southern Alberta is helping scientists rethink some of their ideas about dinosaurs.

The skull was found in 2008 by a team of scientists led by Dr. David Evans of the Royal Ontario Museum.

The skull is about 85 million years old.

The top of the skull is made of a dome-shaped mass of solid bone about 10 centimetres thick.

This means the dinosaur belonged to a group of dinosaurs called pachycephalosaurs (“thick-headed lizards”).

The scientists compared the skull to all of the known pachycephalosaur specimens in the world – about 600 of them.

They learned that there are 16 different species within that group, and the skull discovered in Alberta belongs to a species that has never been seen before.