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Apatosaurus is a genus of extinct sauropod dinosaurs that lived in North America during the Late Jurassic period. It was originally described in 1877, when Othniel Charles Marsh named the first-known species, Apatosaurus ajax. A second species, Apatosaurus louisae, was discovered in 1916. They range in age from 152 to 151 million years ago (mya), during the early Tithonian ages of the Morrison Formation in modern-day Colorado, Oklahoma, and Utah, in the United States. Apatosaurus had an average length of 22.8 m (75 ft), and an average mass of at least 16.4 metric tons (18.1 short tons). A few specimens indicate a maximum length up to 30% greater than average and a mass of 33–73 t (32–72 long tons; 36–80 short tons).

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