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meaning: "Atlas lizard"
Named By: Othniel Charles Marsh in 1877
Time Period: Late Jurassic, 150 Ma
Location: USA, Colorado - Morrison Formation
Size: Unknown
Diet: Herbivore
Fossil(s): Two vertebrae
Classification: | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Diplodocoidea | Apatosaurinae |
Also known as: | Titanosaurus montanus |

Atlantosaurus (meaning "Atlas lizard") is a dubious genus of sauropod dinosaur. It contains a single species, Atlantosaurus montanus, from the upper Morrison Formation of Colorado, United States. Atlantosaurus was the first sauropod to be described during the infamous 19th century Bone Wars, during which scientific methodology suffered in favor of pursuit of academic acclaim.

Read more about Atlantosaurus at Wikipedia
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