Early Existence of Largest Raptor Dinosaurs Unveiled by Researchers.

A geological study of the rock formation that encased a fossilized example of the world's biggest "raptor" dinosaur, Utahraptor, shows it's 10 million years older than previously understood, indicating that the rocks at the Stikes Quarry are at least 135 million years old. The revised age has important implications for the evolutionary history of dinosaurs and narrows the gap in the rock record at the boundary between the Jurassic and Cretaceous Periods in Utah. The study also revealed that the rock strata from the Stikes Dinosaur Quarry were deposited during a global change episode known as the Weissert Event.