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Shifodong Formation
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Shifodong Fm base reconstruction

Shifodong Fm

Period: 
Permian

Age Interval: 
P3 (63), Changhsingian Stage (late Lopingian Epoch; latest Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at the Shifo Cave of the Sipaishan Country, Gengma County, Yunnan Province (98°34′, 23°25′). It was named by Lan Chaohua et al., in 1983.


Lithology and Thickness

Limestone. Composed of light-grey and grey-white massive limestones, intercalated with a small amount of black micrite, bio-limestone and dolomite. Thickness is over 230 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Damingshan Fm; but in the type section, it is in a fault contact with the underlying Damingshan Fm. But regionally, the next older unit is the Nanpihe Fm.

Upper contact

Uncertain; no distinct contact relationship between it and its overlying strata

Regional extent

Distributed in the Gengma County and the Yunlong-Mengla region.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.9,26.9],[99.03,26.95],[99.17,26.85],[99.36,26.71],[99.47,26.47],[100.64,24.64],[100.87,24.33],[100.97,23.62],[100.98,23.42],[101.23,22.85],[101.39,22.59],[101.67,22.31],[101.86,21.2],[101.32,21.17],[101.07,21.79],[101.05,21.98],[100.76,23.17],[100.28,24.14],[100.29,24.37],[100.3,24.49],[100.25,24.57],[100.2,24.66],[99.95,24.8],[99.68,24.93],[99.31,25.2],[99.16,25.51],[98.9,26.26],[98.9,26.9]]]]}}

Fossils

It yields Fusulinids represented by Palaeofusulina sinensis, Nankinella sp., and Foraminifera represented by Colaniella cf. pulchra, whose features are similar to those of the fauna from the Changxing Fm in South China.


Age 

Late stage of the Changhsingian Stage of Late Permian Epoch

Age Span: 

    Beginning stage: 
Changhsingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
254.24

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

Depositional setting

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


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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