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Jiala Formation

Jiala Fm

Period: 
Permian

Age Interval: 
P (51), latest Cisuralian to earliest Guadalupian epochs (latest-Early to earliest-Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the West Trench of the Jiala Pass, Saga County, Tibet. It was named by Lin Baoyu and Qiu Hongrong in 1982.


Lithology and Thickness

Volcanicastics and Limestone. Composed of dark-purple thin- and medium-bedded welded tuffs, vesicular basalt, marl and bioclastic limestone, with a thickness of over 322 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Unclear contact relationship with the underlying strata.

Upper contact

Unclear contact relationship with the overlying strata. Possible next-younger regional unit (or partly coeval) might be the Lasaila Limestone Fm

Regional extent

Distributed in the Jiala Pass of Saga County and the Langcuo North area to the east of the Angren County, Tibet.


GeoJSON

null

Fossils

Abundant animal fossils include Ammonoids represented by Popanoceras, Neogeoceras, Agathiceras, Neocrimites, Propinacoceras, Parapronorites, Neopronorites, etc.; Corals represented by Wannerophyllum, Dielasma, etc.


Age 

Xiangbo’an Stage of the Yangsingian Epoch = latest Cisuralian to earliest Guadalupian epochs (latest-Early to earliest-Middle Permian)

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


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing