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Baga Formation
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Baga Fm base reconstruction

Baga Fm

Period: 
Permian

Age Interval: 
P3, (54a), Changhsingian Stage of the Lopingian Epoch (latest Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the Baga area, Shengmi Village, Pazhuo District, Dingri County, Tibet. It was named by Rao Rongbiao and Zhang Zhenggui in 1985.


Lithology and Thickness

Shale and Limestone. Grey-black shale with calcareous concretions and dolomitic limestone. Thickness is 8 m.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Quburiga Fm.

Upper contact

Disconformable contact with the overlying Tulong Fm of the Early Triassic Epoch

Regional extent

The formation is distributed in the areas of the Dingri and Nyalam Counties, Tibet.


GeoJSON

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Fossils

The shale yields brachiopods represented by Spinomarginifera, Transennatia and Fususpirifer. The limestone has abundant conodonts represented by Clarkina deflecta, C. subcarinata, C. subcarinata changxingensis, N. carinata, Xaniognathus elongates and Enantiognathus ziegleri.


Age 

Changhsingian Stage of the Lopingian Epoch based on the conodonts.

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


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)