Sanzhushan Fm
Type Locality and Naming
The type section is located at Tongweng in Muli Country, Sichuan. It was named by Du Qiliang in 1979, which is used be called the Biyougou group in Regional Stratigraphic Table of Southwest China in Sichuan (1978).
Synonym:
Lithology and Thickness
The Sanzhushan Fm, 921 m thick, is mainly composed of gray, light gray sandstone and mudstone interbedded with limestone, with more bioclastic limestone in the upper part.
Relationships and Distribution
Lower contact
The Sanzhushan Fm is conformable in contact to the underlying Linghaigou Fm with a bed of dark grey sericite slate.
Upper contact
It is conformable in contact to the overlying Masuoshan Fm with a bed of bioclastic limestone at the top.
Regional extent
The formation is restrictively distributed in Yidun and Muli of western Sichuan.
GeoJSON
Fossils
This formation yields bivalves and gastropods, with Costatoria goldfussi mansuyi-Mentzelia mentzeli bivalve assemblage.
Age
Depositional setting
It is interpreted as a carbonate platform environment.
Additional Information