Mangkelu Fm
Type Locality and Naming
Northwest Junggar. The type section is located at Mangkelu gully in West Junggar. It was named by the Joint Stratigraphical Branch Team between the Chinese Academy of Geological Sciences and the Xinjiang Team of Regional Geological Survey in 1973. Hou Hongfei et al. quoted it formally in 1979.
Lithology and Thickness
Sandy limestone. It is a set of carbonate rock deposit, about 288 m thick. It is mainly composed of yellowish-brown thin-bedded sandy limestone, bioclastic limestone, intercalated with yellowish-brown siltstone, calcareous fine-grained sandstone, sandy conglomerate. Some graded bedding is present.
Relationships and Distribution
Lower contact
The basal boundary is placed on the basis of the appearance of limestone from the underlying Manger Fm.
Upper contact
There may be an unconformable contact with the overlying Hujierste Fm. [NOTE: One Lexicon chart shows an overlying "Hefeng Fm", but this was not mentioned in English Lexicon text.]
Regional extent
GeoJSON
Fossils
The formation contains brachiopods, corals, bryozoans, etc., which can be partly concentrated into shelly beds. The important fossils are: brachiopods: “Paraspirifer” gigantean, Leptaenopyxis bouei, Gladostrophia knodoi, Coelospira sp., Kozillowskiella sp.; corals: Pteurodictyum sp., Syringaxon sp., Barrandeophyllum sp., Pachyfavosites sp., Pachyfavosites sp., Squameofavosites sp.; bryozoan: Fistulipora sp., Leioclema sp.
Age
Depositional setting
Additional Information