They were variously assigned to several preexisting genera of dinosaur until paleontologist Othniel Charles Marsh named them in 1877 during the Bone Wars. The earliest fossils of Allosaurus were tail vertebrae found in the Morrison Formation of Colorado by geologist Ferdinand Vandeveer Hayden in 1869, who sent them to Joseph Leidy for study. jimmadseni, which is named in honor of paleontologist James Henry Madsen. However, the species that was cloned by International Genetic Technologies is now believed to be A.
The genus name Allosaurus describes the concave shape of its vertebrae, which was unique when the animal was first identified in 1877. fragilis the species name references the fragile nature of its fossilized remains. It lived during the Kimmeridgian and Tithonian ages of the late Jurassic period, approximately 155 to 145 million years ago, and is known from western North America as well as Portugal and potentially other parts of the world. Allosaurus, meaning “different reptile,” is a genus of large carnivorous theropod dinosaur in the family Allosauridae.
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