Canada ordered all of its citizens in China to return home, cutting that year's field season short. Canadian scientists returned to China again in 1990 to continue excavating at dig sites identified on earlier expeditions, and noteworthy discoveries were made on a near-daily basis. An extraordinarily well-preserved cycadophyte fossil was discovered near Urad Houqi in 1990, sixty years after the Sino-Swedish Expeditions (1927-1935) had uncovered fossils at the same site in 1930. By the time CCDP researchers returned to Canada in August, the organization had already determined there would be no further missions to China. Later that summer a handful of Canadian sites failed to produce any notable fossils. A final expedition was made to Dinosaur Provincial Park and Grande Cache in 1991, during one of the most successful field seasons in the history of the Royal Tyrrell Museum. Chinese researcher Tang Zhilu, who had made the first major discovery of the CCDP, made one of the last discoveries of the project when he uncovered an ankylosaurid skull belonging to Edmontonia. With the conclusion of the 1991 field season the China-Canada Dinosaur Project ended six years into their eight-year mandate. The CCDP produced an enormous amount of fossils, with over fifteen tonnes of fossil material collected in Canada and another sixty tonnes in China. Impact Discoveries New dinosaur taxa described by the China-Canada Dinosaur Project include Alxasaurus, Bellusaurus, Mamenchisaurus sinocanadorum, Monolophosaurus, Sinornithoides, Sinraptor, and Wuerhosaurus ordosensis. An incomplete skeleton recovered from Pingfengshan in 1989 is believed to be an unidentified species of Euhelopus. The project also described non-dinosaurian fossils such as the turtles Khunnuchelys, Ordosemys, and Zangerlia neimongolensis; the crocodyliforms Rugosuchus and Sunosuchus junggarensis; the crocodilian Borealosuchus griffithi; the trace fossil Fictovichnus; and an unidentified atoposaurid tentatively assigned to the genus Theriosuchus. The CCDP also produced six distinct types of fossilized embryos believed to belong to the protoceratopsians Protoceratops and Bagaceratops. In addition to specimens recovered in the field, CCDP researchers also reanalyzed fossil material that had gone ignored following earlier expeditions. This includes a partially-complete ankylosaur skull discovered in 1959 or 1960 by a multinational expedition made up of Chinese and Soviet researchers but which was placed into storage and never properly described. The skull was rediscovered while searching for fossils to feature in the Dinosaur Project's touring show, and in 2001 was made the holotype for a new genus of dinosaur: Gobisaurus. A survey conducted of the Djadochta