Like its larger relative, the Tyrannosaurus rex, the Gorgosaurus was carnivorous, with large curving teeth. It also roamed the western parts of Canada and the United States in the late Cretaceous, approximately 75 million years ago.
Named for paleontologist Doug Wolfe’s 8-year-old son, Christopher, who was the first to spot its bones, the Zuniceratops was an upper Cretaceous herbivore equipped with sturdy teeth that could chomp branches from trees.
The Acrocanthosaurus, a carnivore who roamed the United States and Canada around 115-105 million years ago, is noted for the spines running along its back. Scientists speculate these could have been used in communicating status or other social interactions, fat storage or temperature control.
The herbivorous Chasmosaurus, which inhabited Canada around 75 million years ago, had the characteristic frill of a ceratopsid, which scientist think could have been anything from a mating display to a way to regulate body temperature.
Shown in the image above, left to right: Apatosaurus ajax, Seismosaurus hallorum, another Apatosaurus ajax and Stegosaurus armatus The Morrison Formation is a distinctive body of rock that is rich in fossils of dinosaurs that lived during the late Jurassic, like the Stegosaurus with its tall spikes and plates and the giant Seismosaurus and Apatosaurus, some of the largest land animals that ever lived.