Allosaurus

Allosaurus is a genus of large, bipedal carnivorous theropod dinosaurs from the Late Jurassic. Its fossils are especially abundant in western North America.

Theropoda: Theropoda is a dinosaur group that includes birds and extinct bipedal carnivores. Allosaurus belongs to this broad group of mostly bipedal dinosaurs.
Allosaurus skull: The Allosaurus skull was large, lightly built, and equipped with serrated teeth and prominent brow ridges. Its construction informs hypotheses about biting and prey capture.
Morrison Formation: The Morrison Formation is a sequence of Upper Jurassic sedimentary rocks across western North America, rich in dinosaur fossils. Many of the best-known Allosaurus fossils come from this formation.
Big Al (dinosaur): Big Al is a relatively complete Allosaurus fragilis skeleton discovered in Wyoming in 1991. Its preserved injuries and completeness have made it a closely studied individual.
Allosauroidea: Allosauroidea is a clade of theropod dinosaurs that includes Allosaurus and its close relatives. This clade places Allosaurus among related large-bodied theropods.
Allosaurus bite: The Allosaurus bite was a forceful, slashing action inferred from skull mechanics and tooth wear. One biomechanical model proposes that the skull acted like a hatchet during feeding.
Cleveland-Lloyd Dinosaur Quarry: Cleveland-Lloyd Dinosaur Quarry is a Utah fossil site containing an unusually dense accumulation of Jurassic dinosaur bones. Its abundant Allosaurus remains made the quarry central to study of the genus.
Big Al Two: Big Al Two is a nearly complete Allosaurus skeleton discovered in Wyoming in 1996. This specimen provides another unusually complete view of the genus.
Allosaurus fragilis: Allosaurus fragilis is the best-known species of Allosaurus, represented by numerous fossils from western North America. Most familiar descriptions and fossils of the genus concern this species.
Theropod locomotion: Theropod locomotion concerns how these dinosaurs moved, including walking, running, and balancing on two legs. Allosaurus’s legs and tail supported bipedal movement.

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