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Nanpihe Formation
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Nanpihe Fm base reconstruction

Nanpihe Fm

Period: 
Permian

Age Interval: 
P3 (63), Lopingian Epoch


Province: 
Yunnan

Type Locality and Naming

The type section is located in the vicinity of the Nanpihe Bridge Highway Maintenance Squad, Gengma County, Yunnan Province. It was named by Lan Chaohua et al. in 1983.


Lithology and Thickness

Shale and Siltstone. Dark-grey shale, siltstone and silty shale, intercalated with coal seams, with its lower part being intercalated with a small amount of siliceous limestone. Thickness is over 435.6 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Damingshan Fm

Upper contact

Regionally, the next younger unit is the Shifodong Fm

Regional extent

Distributed in the region of the Gengma and Yongde Counties. It is thicker in the north and thinner in the south. As in the southern part of the Gengma Flatland the limestone intercalations are increasing in amount in the middle and upper parts of the formation, with a thickness of 240 m.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[99.42,24.98],[99.57,24.86],[99.67,24.69],[99.67,24.43],[99.66,24.19],[99.66,23.99],[99.67,23.82],[99.55,23.61],[99.51,23.37],[99.51,23.18],[99.46,23.13],[99.31,23.11],[99.15,23.14],[99.03,23.16],[98.95,23.18],[98.92,23.26],[98.91,23.36],[98.9,23.47],[99,23.59],[99.18,23.89],[99.22,24.14],[99.23,24.41],[99.16,24.74],[99.06,25.16],[99,25.51],[98.89,26.31],[98.95,26.23],[99.07,25.74],[99.09,25.66],[99.21,25.33],[99.42,24.98]]]]}}

Fossils

Plant fossils (phytolites) as Lobatannularia, etc.


Age 

The plant fossils belong to the Lopingian Epoch.

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
259.55

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting

It is interpreted as littoral swampy-facies deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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