Dawangou Fm
Type Locality and Naming
The type section is on the slope of Yingan Hill northwest of Village Yingan in Kalpin County, Xinjiang. The Dawangou Fm was named by Zhou Tianrong in 1990, and was published by Zhao Zhiyin and Zhang Guizhi (1991).
Synonym: (大湾沟组）
Lithology and Thickness
The Formation is composed of light gray, grayish yellow and gray medium- to thin-bedded and nodular muddy bioclastic micrite, with glauconite-bearing algal bindstone in the middle part and irregular chert bands at the base. In the type area, the Dawangou Fm is 15 m thick.
Relationships and Distribution
Lower contact
It rests conformably on the pelmicrite limestone of the Yingshan Fm
Upper contact
It is conformably overlain by the black shale of the Sargan Fm.
GeoJSON
Fossils
This formation yields cephalopods of Dideroceras wahlenbergi-Ancistroceras assemblage, trilobite Carolinites ichangensis and conodonts of Baltoniodus aff. navis assemblage, Amorphognathus variabilis assemblage and Eoplacongnathus suecicus assemblage in ascending order.
Age
Depositional setting
Additional Information