First Horned Dinosaur Remains Found In North America In Chance Discovery From Mississippi

A large body of water separated the present-day North American continent into two halves during most of the late Cretaceous Period, between 95 and 66 million years ago, and because of the seaway linking the Arctic Ocean to the Gulf of Mexico, land animals on one side could not make it to the other, and would therefore evolve independently. One such genus of animals, trapped on the western half, was the horned dinosaur, whose remains have been found in western North America, as well as Asia. However, the discovery of a tooth in Mississippi provides evidence that horned dinosaurs were present in eastern North America as well. The fossil, dated to between 66 and 68 million years ago, is from a dinosaur closely related to Triceratops, the most well-known genus of horned dinosaurs. The find also suggests that there could have existed some land connection between the two land masses thought to be completely separate at the time. This is a tooth of a ceratopsid horned dinosaur from Mississippi.