The Qigu Formation is a Late Jurassic (Oxfordian) geologic formation in the Southern Junggar BasininChina. Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including theropod teeth and a fibula.[1]astegosaur dorsal vertebra[2] and a Eusauropod tooth.[3]Xinjiangtitan was erroneously thought to be from this formation, but it is actually from the older Qiketai Formation, which is in a different basin.[4] The term "Qigu Formation" is also used to sediments of equivalent age in the Turpan Basin, but this might better be treated as a separate formation. It is laterally equivalent to the Shishugou Formation.
The mass accumulation of Jurassic freshwater turtle fossils belonging to the genus Annemys, discovered in 2009 at a site nicknamed "Mesa Chelonia" in Shanshan County, Xinjiang is thought to likely belong to the Qigu Formation, though it belongs to the strata of the Turpan Basin.[5][6] Remains of indeterminate dinosaurs, including ankylosaurs, metriacanthosaurids, and dromaeosaurids are known from the formation.[7][8][9]
The remains of indeterminate rhamphorhynchidpterosaurs have been recovered from the formation. Among others, the following fossils have been found in the formation:[10]
^Maisch, Michael W.; Matzke, Andreas T. (October 2003). "Theropods (dinosauria, saurischia) from the middle Jurassic Toutunhe Formation of the Southern Junggar Basin, NW China". Paläontologische Zeitschrift. 77 (2): 281–292. doi:10.1007/BF03006942. ISSN0031-0220. S2CID129631182.
^Wings, Oliver; Pfretzschner, Hans-Ulrich; Maisch, Michael W. (2007-01-01). "The first evidence of a stegosaur (Dinosauria, Ornithischia) from the Jurassic of Xinjiang/China". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 243 (1): 113–118. doi:10.1127/0077-7749/2007/0243-0113. ISSN0077-7749.
^Augustin, Felix J.; Matzke, Andreas T.; Maisch, Michael W.; Pfretzschner, Hans-Ulrich (July 2020). "First evidence of an ankylosaur (Dinosauria, Ornithischia) from the Jurassic Qigu Formation (Junggar Basin, NW China) and the early fossil record of Ankylosauria". Geobios. 61: S0016699520300504. doi:10.1016/j.geobios.2020.06.005. S2CID225545154.
^Thomas Martin; Alexander O. Averianov; Hans-Ulrich Pfretzschner (2010). "Mammals from the Late Jurassic Qigu Formation in the Southern Junggar Basin, Xinjiang, Northwest China". Palaeobiodiversity and Palaeoenvironments. 90 (3): 295–319. doi:10.1007/s12549-010-0030-4. S2CID129008041.
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