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Zhuka Formation

Zhuka Fm

Period: 
Triassic

Age Interval: 
Middle Triassic (TJ35)


Province: 
Xizang (Tibet)

Type Locality and Naming

Yunnan District Diao Team was named in 1988. The named section is located in Zhuka, south of Zesong, Chaya County, Tibet.

Synonym:


Lithology and Thickness

It is a set of rhyolites, rhyolite porphyry, dacite rhyolite, dacite and clastic rock, siliceous rock, crystalline limestone composed of volcanics and sand-clay flysch, can be divided into two parts: Lower part of the dark gray sandstone, siltstone, slate sandwiched with neutral volcanic rock, siliceous rock and limestone; Upper part is dominated by grey rhyolite with dark grey slate, sandstone and a small amount of limestone. Its thickness is 2000 to 3000 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The bottom is in unconformable contact with the underlying Permian.

Upper contact

The top boundary is marked by the disappearance of rhyolite.

Regional extent


GeoJSON

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Fossils

Ammonoids: Bulogites sp., Nevadites sp. Conodonts: Neospathodus germanicus, N. cf. kochuli


Age 

Schematic stratigraphic section indicates Anisian through Ladinian.

Age Span: 

    Beginning stage: 
Anisian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
246.70

    Ending stage: 
Ladinian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
237.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Zhou Ze and Tong Jinnan.