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Qubu Formation
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Qubu Fm base reconstruction

Qubu Fm

Period: 
Permian

Age Interval: 
P (54a), Kungurian Stage (late Cisuralian Epoch; late Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the West Hills of the Qubu Region, Dingri County, Tibet. It was named by Yin Jixiang and Guo Shizeng in 1976.


Lithology and Thickness

Clayey sandstone. Composed of white medium- and fine-grained quartz-sandstone, intercalated with grey-black shale. Thickness is 20 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Jilong Fm (latest Carboniferous to early Permian)

Upper contact

Conformable contact with the overlying Quburiga Fm

Regional extent

Distributed in an E-W-trending belt starting from the Pulan area in the west through the Jilong and Dingri up to the Gangba areas.


GeoJSON

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Fossils

The shale yields abundant Gondwana Glossopterides flora, including Glossopteris communis, G. indica, G. angustifolia, Sphenophyllum speciosum, Raniganjia qubuensis, etc.


Age 

Glossopterides flora assemblage implies early stage of the Yangsingian Epoch => Kungurian Stage (late Cisuralian Epoch)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
283.30

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
279.73

Depositional setting

It is interpreted as marginal Gondwana-facies deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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