Baidong Fm
Type Locality and Naming
The type section is at Village Baidong in western part of Dongtian Township of Ziyuan County, Guangxi. The Baidong Fm (Central-South Compiling Group for Regional Stratigraphic Scale, 1974) is derived from the Baidong Limestone proposed by Zhao Jinke (Chao Kingkoo) and Zhang Wenyou (Chang W.Y.) in 1959.
Synonym: (白洞组）
Lithology and Thickness
In the type area, the Baidong Fm is composed of black thick-bedded siliceous limestone intercalated with muddy limestone lumps. In the vicinity of Huajiang in Xing'an, it is also composed of black compact limestone.
Relationships and Distribution
Lower contact
A conformable contact is observed between the Baidong Fm and the underlying Cambrian Bianxi Fm (spelled Pianchi Fm in this lexicon)
Upper contact
A conformable contact is observed between the Baidong Fm and the overlying Huang'ai Fm
Regional extent
The Baidong Fm changes considerably in thickness and lithology. In Xing'an, it is 34 m thick, and consists of limestone, and westward to Lingui, it is 16 m thick and consists of muddy limestone intercalated with calcareous shale, but eastward to Quanzhou, it is 120 m thick and is composed of limestone intercalated with mudstone or dolomite.
GeoJSON
Age
Depositional setting
Additional Information