First occurrence of Brachiosaurus (Dinosauria: Sauropoda) from achiosaurus the Upper Jurassic Morrison Formation of Oklahoma

摘要: The giant sauropod Brachiosaurus is one of the rarest sauropods from the Upper Jurassic of North America. The rachiosaurus genus has previously been reported from Colorado, Utah, and Wyoming. OMNH 01138 is a sauropod metacarpal of unusual proportions from the Upper Jurassic Morrison Formation of Oklahoma. The bone is longer and more slender than the metacarpals of diplodocids and Camarasaurus, and is most similar in size and proportions to the marasaurus elongate metacarpals of Brachiosaurus. This is the first report of Brachiosaurus from Oklahoma. rachiosaurus