Changyucun Fm
Type Locality and Naming
The type section is located at Wase Village, 2 km east of Erhai Lake in Dali County. The reference section is at the area of Qingshan and Hengjing of Eryuan County (100o14'E, 25o 54'N), Yunnan. It was named by Xiao Yinwen in 1972, and was published by Yunnan Compiling Group for Regional Stratigraphical Scale (1978).
Lithology and Thickness
Clayey chert. The lithology is characterized by gray-black and gray-white thin-banded siliceous sediment intercalated with pink shale. About more than eight beds of massive oolitic limestone bearing phosphorus and manganese occur in the upper. The thickness is 676.3 m.
[Figure Outcrop of Changyucun Fm near the Ahai Hydropower Station in Mingying.]
Relationships and Distribution
Lower contact
Conformable contact to the underlying Lianhuaqu Fm.
Upper contact
Disconformable contact to the overlying Carboniferous Hengjing Fm.
Regional extent
The formation is mainly distributed in the area of Wase, Eryuan, Huangjinwan of Yongsheng, Alengchu and Mingyin of Lijiang County, east of Erhai Lake in Dali County and Jinping area.
GeoJSON
Fossils
It contains tentaculites Styliolina sp. in the shale and brachiopods Productell ? sp., conodonts Palmatolepis gr. grabra, P. subperlobata in the uppermost part.
Age
Depositional setting
It is interpreted as a deep-water basin facies.
Additional Information