![]() They lived about 152 to 151 million years ago (mya), during the early Tithonian age, and are now known from fossils in the Morrison Formation of modern-day Colorado, Oklahoma, and Utah, in the United States. louisae, was discovered and named by William H. ![]() ![]() Othniel Charles Marsh described and named the first-known species, A. Apatosaurus (meaning "deceptive lizard") is a genus of extinct sauropod dinosaurs that lived in North America during the Late Jurassic period.
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