Huanggongtang Fm
Type Locality and Naming
The type section is located at Huanggongtang in Xintian County, Hunan Province. It was named by Huang Weipei and Li Wenjing in 1990.
Lithology and Thickness
Dolomite. It is dominated by thick, massive to thick-bedded dolomite, intercalated with dolomitic limestone and limestone. The thickness is usually between 100-300 m, with a general tendency towards thicker in southwest and thinner in northeast.
Relationships and Distribution
Lower contact
This formation is in conformable contact with the underlying Yijiawan Fm, marked by the appearance of dolomite. It is mostly underlain by the Yijiawan Fm; however, in some places, such as at Yishanpu in Xinning and at west side of Sizhoushan in Guiyang when the underlying Yijiawan Fm is absent, the Huanggongtang Fm directly and conformably overlies on the Tiaomajian Fm.
Upper contact
This formation is in conformable contact the overlying Qiziqiao limestone, marked by the disappearance of dolomite. In central Hunan, the lower part of the overlying Qiziqiao Fm is also intercalated with dolomite, but the thickness is less than 20 m and is not steady.
It is mostly overlain by the Qiziqiao limestone, but at Shiguyuan in Jiahe and at Xianghualing in Linwu the overlying strata is the Baqi Fm.
Regional extent
This formation is mainly distributed south to Shaoyang and Hengyang and the lithology is relatively uniform.
GeoJSON
Fossils
It yields stromatopora, brachiopods, coral fossils of the Endophyllum- Stringophyllum zone.
Age
Depositional setting
Additional Information