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Dadongchang Formation
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Dadongchang Fm base reconstruction

Dadongchang Fm


Period: 
Permian

Age Interval: 
P (44), Kungurian Stage (uppermost Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]


Province: 
Yunnan

Type Locality and Naming

The type section is located at Dadongchang, Tengchong County, Yunnan Province (98°34′, 25°31′). It was named by the Yunnan Regional Geological Reconnaissance Party in 1985.


Lithology and Thickness

Limestone: Light-grey to dark-grey medium-, and thick-bedded massive limestones, containing chert nodules and siliceous bands, with its upper part being intercalated with dolomitic limestone. Basal part has the occurrence of light-yellowish pink bio-crystalline limestone.


Lithology Pattern: 
Siliceous limestone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Kongshuhe Fm.

Upper contact

Conformable contact with the overlying Daba Fm.

Regional extent

Distributed in the Dadongchang, Wujiazhai, Kongshuhe areas of Tengchong County in a S-N-trend, with a thickness of 196.6-276.6 m. In the Dadongchang area of the northern part of province the limestone contains chert nodules and siliceous bands, intercalated with dolomitic limestone, with no top being found and with an exposed thickness of 214 m; southerly in the Xianren Mt. of Daba area the limestone is intercalated with calcareous dolomite, and is 267.6-m thick.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.84,26.29],[98.8,25.88],[98.86,25.26],[98.83,24.81],[98.7,24.55],[98.12,24.2],[97.72,23.87],[97.6,23.9],[97.42,24.5],[97.74,25.11],[98.84,26.29]]]]}}

Fossils

Brachiopods such as Leptodus nobilis, Waagenites sp.; Fusulina such as Yangchienia sp., Nankinella sp.; Corals such as Wentzelella cf. limorica and Iranophyllum splendens; as well as bryozoan, Foraminifera and algae.


Age 

Yangsingian Epoch = = Kungurian Stage (uppermost Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]. But span is dashed as Kufengian (Roadian-Wordian) in Permian Lexicon (Chinese version).

Age Span: 

    Beginning stage: 
Roadian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
274.37

    Ending stage: 
Wordian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
264.34

Depositional setting

It is interpreted as shallow-sea platform-facies carbonate deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing, Shang Qinghua

GeoJSON estimate by Runan Yong, Suxiao Li and Wen Li (Chengdu Univ. Tech. students)