First Known Dinosaur Brain Fossil Discovered

An unassuming lump found on a Sussex beach in 2004 contains the first known fossilized brain tissue from a dinosaur. The 133-million-year-old fossil belongs to a relative of Iguanodon, an iconic herbivorous dinosaur that lived during the early Cretaceous. The fossil mostly consists of an endocast—a sediment cast of the skull cavity where the dinosaur’s brain resided.

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