File:Allosaurus atrox (theropod dinosaur) (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 6 (48691922246).jpg

Allosaurus atrox (Marsh, 1878) - theropod dinosaur skull from the Jurassic of Utah, USA. (DNM 2560, Dinosaur National Monument, Utah, USA)

This specimen has also been referred to Allosaurus fragilis.

Theropod were small to large, bipedal dinosaurs. Almost all known members of the group were carnivorous (predators and/or scavengers). They represent the ancestral group to the birds, and some theropods are known to have had feathers. Some of the most well known dinosaurs to the general public are theropods, such as Tyrannosaurus, Allosaurus, and Spinosaurus.

The most famous Jurassic-aged theropod is Allosaurus. It’s smaller than its Late Cretaceous relative Tyrannosaurus, but was still a top predator. The species Allosaurus atrox is known from numerous individuals found in the Morrison Formation. The species is only known from the Late Jurassic of western America.

From exhibit signage:

This large Allosaurus skull is one of the best-preserved skulls ever discovered. Although made of thin and delicate bones, this skull is uncrushed. Buried for millions of years, the skull is only minimally distorted. A team from the University of Utah discovered this skull here at the Carnegie Quarry in 1924.

Classification: Animalia, Chordata, Vertebrata, Dinosauria, Saurischia, Theropoda, Allosauridae

Stratigraphy: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma

Locality: Carnegie Quarry, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA

See info. at: <a href="https://en.wikipedia.org/wiki/Allosaurus" rel="noreferrer nofollow">en.wikipedia.org/wiki/Allosaurus</a> and <a href="https://en.wikipedia.org/wiki/Theropoda" rel="noreferrer nofollow">en.wikipedia.org/wiki/Theropoda</a> and