A scientist who has been studying a dinosaur fossil found on the East Coast of North America says it is evidence that the continent was divided in half by a shallow sea 100 million years ago.

Dr Nick Longrich, from the Milner Centre for Evolution, has been studying the jaw fragments of a horned dinosaur about the size of a dog. It is believed to be the smaller cousin of the better-known Triceratops – both members of the Ceratopsia dinosaur family.

The jaw fragments are more slender than that of Ceratopsia found on the West Coast of North America, suggesting the dinosaurs evolved differently based on their diets.

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