Qigu Formation
| Qigu Formation | |
|---|---|
| Stratigraphic range: Oxfordian-Early Kimmeridgian, | |
| Type | Geological formation |
| Underlies | Kalaza Formation |
| Overlies | Toutunhe Formation (Junggar) Qiketai Formation (equivalent unit in the Turpan Basin) |
| Thickness | Over 520 m (1,710 ft) |
| Lithology | |
| Primary | Siltstone, sandstone |
| Location | |
| Coordinates | 43°36′N 87°18′E / 43.6°N 87.3°E |
| Approximate paleocoordinates | 42°54′N 97°30′E / 42.9°N 97.5°E |
| Region | Xinjiang |
| Country | China |
| Extent | Southern Junggar Basin (blue) Turpan Basin (disputed) (cyan) |
The Qigu Formation is a Late Jurassic (Oxfordian) geologic formation in the Southern Junggar Basin in China. Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including the stegosaur ("Angustungui qiketaensis"), theropod teeth and a fibula. a stegosaur dorsal vertebra and a Eusauropod tooth. Xinjiangtitan was erroneously thought to be from this formation, but it is actually from the older Qiketai Formation, which is in a different basin. 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.