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Jiaomuchaka Formation
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Jiaomuchaka Fm base reconstruction

Jiaomuchaka Fm


Period: 
Permian

Age Interval: 
P (57), Kungurian Stage (late Cisuralian Epoch) to earliest Guadalupian Epoch (late-Early to earliest-Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at the Jiaomuchaka in the alignment of Chabu-Chaka areas, Shuanghu Region, Tibet. It was named by Wu Reizhong et al. in 1986.


Lithology and Thickness

Limestone. Composed of purple-grey brecciated limestone, bio-limestone and oolitic limestone, with a thickness of over 450 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Uncertain contact with the underlying strata.

Upper contact

Regional extent

Distributed in the Shuanghu area, Tibet.


GeoJSON

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Fossils

Brachiopods such as Plicatifera, and Fusulinida represented by Nankinella, and Misellina, which might be corresponding to the Misellina claudiae zone and the Nankinella orbicularia zone of the Qixia Fm in South China.


Age 

Luodianian and Xiangbo’an Stages of the middle Permian Epoch = Kungurian Stage (late Cisuralian Epoch) to earliest Guadalupian Epoch (late-Early to earliest-Middle Permian)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.15

    Beginning date (Ma): 
281.96

    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

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