Eighty million years ago, a ferocious predecessor of Tyrannosaurus Rex stalked the western shore of an ancient seaway that flooded through North America, slicing the continent in two.
Named Lythronax, or "king of gore," this 2.5-ton tyrannosaur stood a menacing eight feet tall and 24 feet long. Its powerful jaws could swiftly grab prey and tear it apart.
Lythronax is one of many magnificent new dinosaurs that paleontologists have unearthed across the northern Colorado Plateau, helping them piece together a complex evolutionary history.
Gazing across these stark desert landscapes, it's hard to envision a lush, verdant Jurassic Park. Yet in Utah alone, scientists have identified more than 100 dinosaur species just since the mid-1990s, says James Kirkland, Utah's state paleontologist.
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