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Tectonic Features

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Tunlonggongba Formation
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Tunlonggongba Fm base reconstruction

Tunlonggongba Fm

Period: 
Permian

Age Interval: 
P (47), Kungurian Stage (late-Cisuralian Epoch; late-Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the West Trench of the Tunlonggongba area, Duoma Region, Ritu County, Tibet.It was named by Wang Yujing and Mu Xinan in 1980.

Synonym: Cainaha Fm


Lithology and Thickness

Clastics and Limestone. Grey-green sandstone, black slate and dark-grey limestone. Thickness is over 500 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Qudi Fm

Upper contact

Seems to be in disconformable contact with the overlying Longge Fm

Regional extent

Distributed extensively in the Duoma Region of the Ritu County of Tibet. The Tunlonggongba Fm that is distributed in the Mushirebuka area in the southern part of Qiangtang Region used to be known separately as the Cainaha Fm which is composed mainly of carbonate, intercalated with a small amount of sandstone, as well as some basaltic strata. Its thickness is increasing easterly to reach as great as 2200 m.


GeoJSON

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Fossils

Yields fairly abundant marine animal fossils, with its lower part yielding Brachiopods of the Costiferina-Juresania assemblage and with its upper part yielding the Paraderbyia duomaensis-Jipuproductus assemblage. The Fusulinids belongs to the Monodiexodina fauna. There occur also two Coral assemblages, namely the Lytvolasma assemblage and the Polythecalis-Chusenophyllum assemblage.


Age 

Qixia’an Subepoch = Kungurian Stage (late-Cisuralian Epoch; late-Early Permian). In the San’erduo Mt. and the Mushirebuka area the lower part of the formation yields those Fusulinid and Foraminifera fossils that are found to occur very often in its underlying Qudi Fm, or occur in association with the Monodiexodina.

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: 
1.0

    Ending date (Ma):  
274.37

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing