Zhichang Fm
Type Locality and Naming
The type section is located near Zhichang, 10 km south of Wenshan County of Yunnan Province.
It was named by Xian Shiyuan in 1988, and published by Hou Hongfei and others in 1988.
Lithology and Thickness
The formation, 175.6 m thick, is characterized by gray to dark-gray thick- and massive-bedded medium-grained crystalline dolomite.
Relationships and Distribution
Lower contact
The Formation has a conformable contact on the underlying Pojiao Fm and is easy recognized from the latter on the basis of the first appearance of dolomite.
Upper contact
The Formation is overlain by the Gumu Fm.
Regional extent
GeoJSON
Fossils
Limestone intercalations at the basal part of the Formation yield Nowakia praecursor, and the lower part has some brachiopods Zdimir spp. and Megastrophia sp.
Age
Depositional setting
It is interpreted as a platform margin sedimentary environment.
Additional Information