Shedian Fm
Type Locality and Naming
It was named by the Regional Survey Party under the Geological Bureau of Yunnan Province in 1965. The naming section is located in the vicinity of the Shedian area 2 km northeast of Longjie Street, Dayao County, Yunnan Province, with the section situated in the Xiazhuang area to Pupeng area of Xiangyun County, Yunnan Province serving as its reference section (Compiling Group for the Regional Stratigraphic Chart of Yunnan Province, 1978).
Synonym: （蛇店组）
Lithology and Thickness
Lower part is composed of grey-violet and light-violet massive fine-grained arkosic quartz-sandstones and sandy mudstones, with a thickness of 124.4 m. Middle part consists of a non-isopachous alternating layer of grey-white and light-yellow thick-bedded to massive poststones (= fine-grained sandstone) in association with purple sandy mudstone, with a thickness of 223 m. Upper part represents grey-white thick-bedded to massive medium-, and fine-grained sandstones, intercalated with conglomerate and calcareous mudstone, with a thickness of 226 m.
Relationships and Distribution
Lower contact
It is in a conformable contact with the underlying Zhanghe Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Tuodian Fm
Regional extent
The formation is distributed in the Chuxiong Basin. Both its lithology and thickness are basically consistent in various regions.
GeoJSON
Fossils
In the Shuangbo area the formation yields Ostracod fossils as represented by Darwinula impudica, D. sarytirmenensis, and D. contracta.
Age
Depositional setting
Additional Information