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Supersaurus

Supersaurus (meaning "Super Lizard") is a genus of diplodocid from the Late Jurassic of the Morrison Formation in Colorado. It could grow to be 33-34 metres long, and it could weigh up to 35 to 40 tons. It was one of the largest dinosaurs to live. The fossils of Ultrasauros might be made up of bones from Brachiosaurus and Supersaurus.