Editing Ultrasaurus (section)

==Mistaken assessments==
A collection of bones discovered by [[James A. Jensen|Jim Jensen]], of [[Brigham Young University]], at the [[Dry Mesa Quarry]], [[Colorado]] were originally believed to belong to the largest dinosaur ever. Jensen informally called this supposedly new dinosaur "Ultrasaurus", and this name was widely used by the press and in scientific literature as a ''nomen nudum'' (informal name lacking an actual scientific description).

In 1983, [[Kim Hang-mook]] published a paper describing a different specimen representing a new dinosaur species, which he named '''''Ultrasaurus tabriensis''''', because he believed it was bigger than ''[[Supersaurus]]''. However, Kim's assessment was incorrect. His dinosaur was much smaller than he believed, because he mistook a partial [[humerus]] for an [[ulna]]. However, since Kim was the first to publish the name ''Ultrasaurus'', the name officially applied to the small [[South Korea]]n sauropod, and could no longer be used as an official name for Jensen's giant specimen.

Jensen published a paper describing his original discovery in 1985, but since the name ''Ultrasaurus'' was already in use (or "preoccupied"), his discovery was renamed in 1991 to ''Ultrasaur'''''o'''''s''. However, Jensen also made a mistake. His discovery was a chimera; the collection of [[fossil]]s came from two different dinosaur species, both of which already had names. So his new name, ''Ultrasauros'', is now just an alternate name (''junior synonym'') for the dinosaur officially known as ''Supersaurus''.