Damingshan Fm

Period:

Permian

Age Interval:

P₂ (63), middle Permian

Province:
Yunnan

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).

Lithology Pattern:

Limestone

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

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Fossils

Abundant fossils, includes Fusulinida such as Neoschwagerina margaritae, Verbeekina verbeeki, Yabeina sp., etc

Age

Fusulinida imply Yanghsingian Epoch in age, being similar to the Yanghsingian Group in the Yangtze stratigraphic subregion = = Kungurian Stage (uppermost Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]

Age Span:

Beginning stage:

Kungurian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

283.30

Ending stage:

Capitanian

Fraction up in the ending stage:

1.0

Ending date (Ma):

259.55

Depositional setting

It is interpreted as shallow-sea carbonate deposits.

Depositional pattern:

Additional Information

Compiler:

Shang Qinghua