A much more complete specimen WDC DMJ-021, was found in Converse County, Wyoming in 1986 by Brandon Flyr and Bart Lesco while out hiking and was reported to the people who owned the land at the time. The discovery was later named "Jimbo" in 1996 by the family that purchased the land, it was described and assigned to "Supersaurus" in 2007. The specimen represented approximately 30% of the skeleton. Its bones are being held at the Wyoming Dinosaur Center. A comparison of WDC DMJ-021 and other specimens previously assigned to "Supersaurus" was done in order to help decide what material from the Dry Mesa Quarry belonged to the genus. It indicated that a series of tail vertebrae and an ulna may have belonged to some other diplodocid.