Tangaitar Fm
Type Locality and Naming
Western South Tianshan. The type section is located in Qigeleikebieli cove, southeast of Tuogemaite, 42 km of north of Atushi County, Xinjiang. It was named by No 13 Xinjiang Geological Team in 1957, and was published by "The Regional Scale of Northwest China-Xinjiang” in 1981.
Lithology and Thickness
Limestone. The Lower part of this formation, 400~500 m thick, is characterized by black to gray limestone intercalated with a few sericitic chlorite schist beds. The Upper part, 300~400 m thick, is mainly gray to dark-gray thick-bedded limestone intercalated with calcareous conglomerate.
To the east, in Ayili of Wushi County, the lithology of this formation is characterized by thin-bedded limestone and marl intercalated with calcareous siltstone and thin- to thick-bedded gypsum, and yields brachiopods Ambocoelia, Ilmenia, and is 224 m thick. The basal part is mainly grayish-black thin- to medium-bedded limestone.
Relationships and Distribution
Lower contact
The formation rests conformably on the Tuogemaiti Fm of Middle Devonian.
Upper contact
The top is in a disconformable contact with Lower carboniferous.
Regional extent
To the east, in Ayili of Wushi County, the lithology of this formation is characterized by thin-bedded limestone and marl intercalated with calcareous siltstone and thin- to thick-bedded gypsum, and is 224 m thick. The basal part is mainly grayish-black thin- to medium-bedded limestone.
GeoJSON
Fossils
It yields brachiopods Atrypa, Hypothyridina, Schizophoria, and Cyrtospirifer.
In Taxintuokemake, the formation yields coral Megaphyllum, Phillipsastrea, Iowaphyllum.
The brachiopods from the Suyueke south slope of Kalatashitage studied by Yang Shipu can be divided into two assemblages: Hypothyridina semilukiana and Undispirifer undiferus.
To the east, in Ayili of Wushi County, the formation yields brachiopods Ambocoelia, Ilmenia.
Age
Depositional setting
Additional Information