Jianshanying Fm
Type Locality and Naming
The type section is located at the back of Jianshanying Village, Jinzigou Township, Ninglang, Yunnan. It was named by by Dong Zhizhong in 1986
Lithology and Thickness
Limestone. Dominated by carbonate rocks, which can be divided into three members, ascending: (1) Jinzigou Member, composed of gray-white and light-gray moderately thick-bedded intraclastic finely- to powder-crystalline limestones, 40 m thick; (2) Laohudong Member, gray moderately thick-bedded finely- to powder-crystalline intraclastic limestones, intercalated with bioclastic limestone and oolitic limestone, 231 m thick; (3) Hongqiao Member, light-gray and gray-white thick-bedded massive intraclastic finely-crystalline limestones, 21 m thick.
Relationships and Distribution
Lower contact
Disconformable contact with the underlying Silurian-Devonian Qingshan Fm (but "dot" location near Devon7 suggests underlying regionally might be the Changyucun Fm chert?)
Upper contact
Conformable contact with the overlying LuguhuCarb Fm
Regional extent
distributed in the Ninglang area bordered by northwestern Yunnan and Sichuan
GeoJSON
Fossils
(1) Jinzigou Member contains the brachiopod Scaliognathus anchoralis zone; (2) Laohudong Member contains 4 conodont zones, i.e. the Gnathodus homopunctatus, Pseudopolygnathodus? yunnanensis, Gnathodus bilineatus and G. nodusus zones ascending. In addition, there are also corals, Ammonoids, foraminifers and fusulinid Eostaffella sp.; (3) Hongqiao Member contains the brachiopod Gnathodus bilibollandensis-G. girtyi simplex assemblage zone as well as corals, brachiopods and fusulinids
Age
Depositional setting
It is interpreted as neritic deposits
Additional Information