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Discovery of the flat-headed member of the pachycephalosaur family changes the view of dinosaur history during the final days of the Cretaceous Period 66 million years ago, showing that family trees were still evolving even as the entire dinosaur world was about to go extinct, the Children's Museum of Indianapolis said in announcing the find.

The nearly complete pachycephalosaur skull was donated to the museum by three amateur fossil hunters from Iowa who found it in 2003 while exploring the Hell Creek Formation in central South Dakota.

The discovery was announced in Indianapolis in conjunction with the annual meeting of the American Association of Museums.

The museum said the pachycephalosaur family is marked by dragon-like heads covered with horns, knobs and bumps. The most famous family member, Pachycephalosaurus, had a solid, domed bone helmet up to eight inches (20 cm) thick used to ram other dinosaurs in their sides, it said.




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