 SAM 31050 was discovered in the Curdimurka area near Lake Eyre, and SAM P410550, a juvenile specimen, comes from the Neales River region, near the town of Oodnadatta.Another juvenile specimen, SAM P15980, was also later referred to this species.All known specimens come from the Bulldog Shale in South Australia, although material very similar to "Umoonasaurus" has been found in the Darwin Formation in the Northern Territory.