Shallow seas formed, dividing some continents. In the Late Cretaceous, for example, the Western Interior Seaway split North America into two landmasses. At its largest this sea was more than 3,000 ...

Roaming North America during the Late Cretaceous, this ceratopsid measured about 8 meters long and weighed around 2 to 4 tons ...

Xiphactinus was one of the largest bony fish of the Late Cretaceous and is considered ... which covered much of central North America during the Cretaceous. Though long extinct, if alive today ...

Allosaurus was the most common large carnivore of the Late Jurassic in North America. It was a smaller predecessor of the Cretaceous Tyrannosaurus. Strong forelimbs with sharp claws, powerful hind ...

With a massive body, sharp teeth, and jaws so powerful they could crush a car, this famous carnivore dominated the forested river valleys in western North America during the late Cretaceous period ...