Allosaurus was among the earliest dinosaur discoveries, and fossils are plentiful, making it a darling of paleontologists, as well as amateur dinosaur observers.
This large theropod (bipedal, carnivorous dinosaur), which is Utah's state fossil, lived 155.7 million to 150.8 million years ago during the late Jurassic Period. Allosaurus is the most common dinosaur fossil found in Utah's Cleveland-Lloyd Quarry, a site containing the densest concentration of Jurassic dinosaur bones in the world. Of the at least 74 individual dinosaurs found at the quarry, about 46 of them are Allosaurus specimens, according to the U.S. Bureau of Land Management. The bulk of Allosaurus fossils found to date, however, come from the Morrison Formation, which is centered in Wyoming and Colorado.
Fossils possibly belonging to Allosaurus have also been discovered in several other places around the globe, including Portugal, Siberia and Tanzania.
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