"During the late Cretaceous period, an elevated sea level split North America in two. The western landmass was called Laramidia and included what is now the west coast of Canada and the United States.

This swampy region was filled with all kinds of dinosaurs. In fact, it was the greatest documented radiation of dinosaurs anywhere during the entire Mesozoic era. (Also known as the Age of Reptiles, this era refers to all of the Triassic, Jurassic and Cretaceous periods put together.)

New Species of Dinosaur Found in Utah Was Triceratops Cousin
http://blogs.discovermagazine.com/d-brief/2013/07/17/triceratops-co...

             

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