Damingshan Fm
Type Locality and Naming
The type section is located at Yutangzhai, Banka area, Yongde County, Yunnan Province (99°29′, 23°58′). It was named by Lan Chaohua et al. in 1983.
Lithology and Thickness
Limestone. Grey-white massive and dense limestone, intercalated with biogenic limestone, dolomitic limestone and a small amount of oolitic limestone, with its top part being intercalated with brecciated limestone. Thicknesses range from 230 to 890 m (see Regional extent).
Relationships and Distribution
Lower contact
It looks like to be in a disconformable contact with the underlying Yutangzhai Fm (Carboniferous C2), or disconformably on the underlying lower Devonian Series and/or the lower Carboniferous Series.
Upper contact
Disconformable contact with the overlying Nanpihe Fm
Regional extent
Distributed in the Luoshuidong of Changning County, to the north of the Dasue Mt. of Yongde County, Sipaishan of Gengma, Mengsheng and Menglian of Cangyuan, etc. It is thicker in the south and thinner in the north with a stable lithology. In the Luoshuidong area of Changning County on the north it is composed of grey and grey-white massive limestones, intercalated with biogenic limestone, with a thickness of 232.3 m; as well as of 317.2 m at Yutangzhai of Yongde County. In the Jingmao of Menglian area on the south its lower part is composed of calcareous dolomite and dolomite, intercalated with a small amount of limestone, while its upper part is composed of limestone, intercalated with oolitic limestone, dolomitized limestone and a small amount of grey-green quartz-sandstone, with a thickness of 887.7 m.
GeoJSON
Fossils
Abundant fossils, includes Fusulinida such as Neoschwagerina margaritae, Verbeekina verbeeki, Yabeina sp., etc
Age
Depositional setting
It is interpreted as shallow-sea carbonate deposits.
Additional Information
GeoJSON estimate by Runan Yong, Suxiao Li and Wen Li (Chengdu Univ. Tech. students)