Machanggou Fm
Type Locality and Naming
Western Middle Tianshan. The Machanggou Fm was named by Gao Zhenjia et al. in 1977. The type section is at Machanggou Village on east bank of Koksu River Valley, southeast of Tekes County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). Uppermost formation in Tekes Gr.
Synonym: （马厂沟组）
Lithology and Thickness
In the type section, the Machanggou Fm is dominated by a carbonate rock association of grey thick-bedded and thin-bedded dolomitic and siliceous crystalline limestone, medium- to thick-bedded dolomitic marble and minor quartzite. The formation is 290 m thick in the type section, but it is greatly variable both in lithological character and thickness.
Relationships and Distribution
Lower contact
It is in conformable contact with underlying Toudaoqiao Fm.
Upper contact
It is in conformable contact with Kekesu Gr.
Regional extent
Western Middle Tianshan. The formation is distributed at Halajun Mountain, Borohoro Mt. and Jianshanzi- Xingxingxia in east sector of Tianshan Mountains.
GeoJSON
Fossils
The lower part bears stromatolites, such as Kussiella f., Gruneria f., Stratifera f., Conophyton f., Colonnella f.
Age
Depositional setting
Additional Information