File:Allosaurus atrox Cleveland-Lloyd Quarry.jpg

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Allosaurus atrox (Marsh, 1878) theropod dinosaur from the Jurassic of Utah, USA (public display, Cleveland-Lloyd Dinosaur Quarry museum, Utah, USA).

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 (Marsh, 1878) is well known from numerous individuals found in the Morrison Formation (Upper Jurassic) at the famous Cleveland-Lloyd Quarry in Utah, USA. Allosaurus atrox is only known from the Late Jurassic of western America.

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

Stratigraphy: Morrison Formation, Tithonian Stage, upper Upper Jurassic

Locality: Cleveland-Lloyd Quarry, northern Emery County, east-central Utah, USA

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.

Source Allosaurus atrox theropod dinosaur (Morrison Formation, Upper Jurassic; Cleveland-Lloyd Quarry, northern Emery County, east-central Utah, USA) 1
Author James St. John


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