Qigu Fm
Type Locality and Naming
Junggar and Turfan-Hami Basins. It was named by M.I. Saidov as the Qigu Rock Series in 1935. The naming locality is situated at Qigu Village to the west of Urumqi City, Xinjiang, with its reference section being situated at the Manas River, Xinjiang.
Synonym: （齐古组）[There is also an Upper Devonian "Qigu" Fm in south Qinling of Gansu (Dev column 41a), therefore that Devonian one is named as "QiguDev" in this on-line Lexicon.]
Lithology and Thickness
The formation is composed mainly of purple and cherry mudstones and sandstones, intercalated with a small amount of green mudstones and sandstones.
Relationships and Distribution
Lower contact
It is in a conformable contact with the underlying Toutunhe Fm, yet in the Tuostai region it is in an unconformable contact with the underlying Toutunhe Fm.
Upper contact
In the Tuostai region its top part is covered by the Kalazha Fm
Regional extent
The formation is distributed largely in the Junggar and Tulufan-Hami Basis, with a good development of it being found in the Toudun River-Manass River region on the southern margin of the Junggar Basin. In the central region of the northern part of the Junggar Basin, it is found to occur either in the drilling wells or on the surface. Meanwhile, in the Tulufan-Hami Basin it is exposed essentially in the Shanshan-Sanjianfang region.
GeoJSON
Fossils
It yields Dinosaur fossils as represented by Carnosauria and Megalosauridae, Mesosuchia, and Ostracoda fossils as represented by Darwinula impudica, D. sarythirmenensis and D. magna.
Age
Depositional setting
Additional Information