December 09, 2021
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Allosaurus was among the first dinosaurs to be discovered. Its fossils are abundant, making it a favorite of paleontologists and dinosaur watchers.
74 individual dinosaurs
This large theropod (bipedal-carnivorous dinosaur) is Utah's state fossil. He lived between 155.7 and 150.8 million years ago, at the end of the Jurassic period. Allosaurus, the most common dinosaur fossil in Utah The Cleveland-Lloyd quarry houses the largest concentration of Jurassic dinosaur bone fragments in the world.
According to the US Bureau of Land Management, 46 of the 74 dinosaurs discovered at the quarry are Allosaurus specimens. The Morrison Formation is located in Wyoming and Colorado, and contains the majority of Allosaurus fossils.
Fossils thought to be related to Allosaurus have been found in many other places around the world, including in Siberia, Tanzania and Portugal.
Outside A. fragilis, it is unknown how many other species of Allosaurus have existed – as many as eight different species have been proposed over the past 30 years. “Allosaurids from the Late Jurassic Morrison Formation are grouped into a single genus with a few species,” said paleontologist Matthew Mossbrucker, director and chief curator of the Morrison Museum of Natural History. "But the reality of the diversity of these animals is unknown."
Only a handful of species are considered valid at any given time, although valid species are still debated. Currently, there are four "unambiguous" Allosaurus species in North America (A. fragilis, A. atrox, A. jimmadseni, and A. lucasi), according to a 2014 study published in the journal Volumina Jurassica.
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