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Dangchong Formation
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Dangchong Fm base reconstruction

Dangchong Fm

Period: 
Permian

Age Interval: 
P2 (88), lower to middle Kungurian Stage (late Cisuralian Epoch; late-Early Permian)


Province: 
Hunan

Type Locality and Naming

The type section is located at Dangchong of Baohetang area, Shaodong County, Hunan Province. It was named by Tian Qizhun and Xu Reilin in 1936.


Lithology and Thickness

Limestone and Shale. It is divisible into two parts. Lower part above a basal black shale is composed of grey calcareous slate and clayey limestone, intercalated with carbonaceous shale, with a thickness of 14 m. Upper part consists of grey and dark-grey thin- and medium-bedded limestones, intercalated with shale, siliceous rocks and skeletal limestone, with a thickness of 82 m. The lithology of the formation is fairly stable, and its thickness reaches as great as 120 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Qixia Fm

Upper contact

Conformable contact with the overlying Leping Fm

Regional extent

Distributed to the south of an alignment of Ma’anshan, Qiaotou and Douli Mt. areas, Xinhua County, Hunan Province, as well as at Huangfengqiao and Guanghuang of Youxian County and Shanshan Mt. of Hengshan County, Hunan Province, with its thickness getting greater from south to north, and with the limestone interbeds increasing in amount, thus resulting in a facies change of it into the limestone of the Maokou Fm.


GeoJSON

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Fossils

The Dangchong Fm in the Qujiang and Renhua areas is found to yield Radiolaria fossils (Song Tianrui et al., 1977).


Age 

Luodianian Stage to Gufengian (Kufengian) Stage of the Middle Permian Yangsingian Epoch = lower to middle Kungurian Stage (late Cisuralian Epoch; late-Early Permian)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
278.84

    Ending stage: 
Roadian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
269.21

Depositional setting

It is interpreted as fairly deep-water basin deposits.


Depositional pattern:  


Additional Information


Compiler:  

Hu Shizhong

GeoJSON estimate by Can Cai and Xinyi Zhang (Chengdu Univ. Tech. students)