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Yangjiaping Formation
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Yangjiaping Fm base reconstruction

Yangjiaping Fm

Period: 
Permian

Age Interval: 
P2-P3 (67), early Wuchiapingian stage (earliest Lopingian; earliest Late Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located in the Yangjiaping area 16 km to the northwest of the Ninglang County Town, Yunnan Province. It was named by the 4th Team under the Yunnan Regional Geological Reconnaissance Party in 1980.


Lithology and Thickness

Volcanics. Composed of dense basalt, intercalated with volcanic breccia and limestone lenses, with a thickness of 538.8 m. The formation represents a westerly extension of the middle and upper parts of the Emeishan Basalt Fm (Omeishan Fm)


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Conformable contact with the grey and dark-grey medium- and thick-bedded marls and pebbled limestone, intercalated with bioclastic limestone at the top of the underlying Xipiaoluo Fm.

Upper contact

Disconformably overlain by the dark-grey medium- and thick-bedded oolite-, and skeletal-fragment-bearing limestones at the base of the overlying Heinishao Fm.

Regional extent

Distributed only in the areas of the Yongsheng and Ninglang counties, Yunnan Province, with a thickness of 362-676 m.


GeoJSON

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Fossils

The limestone yields Foraminifera represented by Geinitzina sp., Climacammina sp.; and Brachiopods represented by Haydenella sp., etc.


Age 

Latest Capitanian - earliest Wuchiapingian stage (early Lopingian; early Late Permian). Assigned same age as upper part of Emeishan Basalt Fm in Sichuan.

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: 
0.15

    Ending date (Ma):  
258.75

Depositional setting

It is interpreted as basic effusive rock into a marine facies.


Depositional pattern:  


Additional Information


Compiler:  

Zhu Zili, Fei Shuying