Qigu Formation
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 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.
| 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 | 43.6°N 87.3°E |
| Approximate paleocoordinates | 42.9°N 97.5°E |
| Region | Xinjiang |
| Country | China |
| Extent | Southern Junggar Basin (blue) Turpan Basin (disputed) (cyan) |
Qigu Formation (Dzungaria) | |
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