Sanze Fm
Type Locality and Naming
It was named by the 3rd Team of the Party of Regional Geological Survey, Sichuan Bureau of Geology in 1973 and published by the Compiling Group of Regional Stratigraphical Scale, Sichuan Province in 1974. The type section is located at Zawu, Sanze, Zhongza Township, Batang County, Sichuan Province.
Synonym: (散则组)
Lithology and Thickness
The formation, 717 m in thickness, is divided into two parts. Lower part of the formation consists of dark gray knotty argillaceous limestone and slate intercalated with siltstone, seldom with tuff. Upper part is composed of gray, dark gray limestone or grayish white limestone.
Relationships and Distribution
Lower contact
Conformable contact is recorded for the Sanze Fm onto the underlying Gezhadi Fm
Upper contact
Conformable contact is recorded for the Sanze Fm with the overlying Yongren Fm
Regional extent
In the area south of Sanze, it is dominated by carbonate rock, intercalated with clastics and tuff, in thickness of 340-700 m. In the area north of Batang, lithological variation becomes considerable; it is composed of clastics intercalated with carbonate rock and volcanic rock of thickness 816 m at Dangjiezhengla; volcanic clastics and carbonate rock of 870 m thick at Buzhe; 1851 m thick at Jiaying; volcanic rock, clastics and carbonate rock of 2352 m in thickness at Ranxi and Oyie Mt. In brief, the thickness of the formation increases from south to north; volcanic rock decreases from central part to northern part; minor tuff occurs in south. The formation is exposed merely at Zhongza, Batang County, Sichuan Province.
GeoJSON
Fossils
It yields anthozoa Halysites senior, Fletcheriella sp., Favosites ganinensis; trilobite Coronocephalus sp.; brachiopod Conchidium sp., Xinanospirefer sp., Pentamerus sp., etc.
Age
Depositional setting
Additional Information