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Tuoba Formation
Click to display on map of the Ancient World at:
Tuoba Fm base reconstruction

Tuoba Fm


Period: 
Permian

Age Interval: 
P3 (60), Wujiapingian Stage (early Lopingian Epoch; early Late Permian)


Province: 
Xizang (Tibet), Sichuan, Yunnan

Type Locality and Naming

The type section is located in the Tuoba area 70 km to the east of the Chando County of Tibet. It was named by Li Pu in 1955.


Lithology and Thickness

Clastics and Coal. Composed of grey-black quartz-sandstone, siltstone, sandy shale, clayey limestone, coal seams and poor coal. Thickness is 880 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Disconformable or a conformable contact with the underlying Tyokar Fm

Upper contact

Conformably on the underlying Kaxiangda Fm

Regional extent

Distributed in the Mangkang, Chando and Chaya areas of Tibet, the Batang area of Sichuan Province, and the Deqin area of Yunnan Province.


GeoJSON

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Fossils

Yields such Plant fossils (phytolites) as Sphenophyllum, Pecopteris, Fascipteris, Protoblechnum, Gigantopteris, Gigantonoclea, Rhizomopsis, Lobatannularia, Schizoneura and Taeniopteris, whose features are similar to those of the Gigantopterides flora occurring in the Luoping and Xuanwei Coal Series of South China, belonging to part of South China-type of the late-stage Cathaysia flora. There are found only two genera of Coral fossils represented by Liangshanophyllum and Aridophyllum both of which represent zone fossils or important members of the Wujiaping Fm in South China whose age is of the early stage of the Lopingian Epoch.


Age 

Wujiapingian Stage (early Lopingian Epoch; early Late Permian)

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)