Allosaurus

Utah State Fossil

allosaurusfossilStalking.jpg

Allosaurus fossil skeleton

Allosaurus fossil skeleton; photo by Corwin I on Flickr (noncommercial use permitted with attribution / share alike).

Allosaurus

Utah designated allosaurus as the official state fossil in 1988. Living 145 to 150 million years ago in Utah, Wyoming, Montana, Colorado, New Mexico, South Dakota, and Oklahoma, allosaurus was the most common large carnivore of the Late Jurassic period in North America (a predecessor of the larger Tyrannosaurus of the Cretaceous).

Many Allosaurus fossils have been found in the Rocky Mountain west. Weighing 1.5 - 2 tons as an adult and measuring 30 - 40 feet long, allosaurus possibly hunted in packs to bring down large prey.

Utah

Images

Allosaurus skull; photo by Brian Smith on Flickr (noncommercial use permitted with attribution / share alike).

Allosaurus skull fossil

"Big Al" Allosaurus fossil from the University of Wyoming Geological Museum- photo © Mark Ryan on Flickr - noncommercial use permitted with attribution / no derivative works.

Videos

Allosaurus - Planet Dinosaur - Episode 4 - BBC One

Walking With Dinosaurs - Allosaurus - Epicon Hybrid