World's First Fossilized Dinosaur Brain Found

The 133-million-year-old specimen came from the skull of an Iguanodon, a genus of large, iconic herbivores that lived during the Jurassic and Cretaceous periods. Scientists say the innocuous rock contains wrinkles, tubes and folds that are actually fossilized forms of the meninges (the tough cushioning tissue that surrounds the brain), blood vessels and gray matter.