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Jiangyema Formation
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Jiangyema Fm base reconstruction

Jiangyema Fm

Period: 
Permian

Age Interval: 
P3 (52), Changhsingian Stage of the Lopingian Epoch


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located on the eastern side of the Jiangyema area about 100 km to the southeast of the Zhada County, Tibet. It was named by Guo Tieying and Liang Dingyi in 1982.


Lithology and Thickness

Limestone. Composed of grey-white and light-pink bioclastic limestones, with a thickness of about 50 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Xilanta Fm

Upper contact

Conformable contact with the overlying strata of Lanchenquxia Fm (now Lanchengqu Gr in the Triassic Lexicon usage) of early Triassic

Regional extent

Distributed in the area of Zhada County, Tibet.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[79.06,32.88],[80.75,31.32],[81.17,30.98],[81.63,30.76],[82.27,30.59],[82.05,30.6],[81.63,30.57],[81.31,30.49],[81.17,30.39],[81.04,30.36],[80.89,30.44],[80.59,30.6],[80.32,30.69],[80.17,30.75],[79.93,30.97],[79.68,31.26],[79.4,31.59],[79.11,32.01],[79.04,32.33],[79.06,32.88]]]]}}

Fossils

Fusulinida as represented by Reichelina, Codonofusiella, Palaeofusulina?, Nankinella; and Foraminifera as represented by Colaniella, Pseudocolaniella, Paracolaniella, Neoendothyra and Nodosaria, etc.


Age 

Changhsingian Stage of the Lopingian Epoch

Age Span: 

    Beginning stage: 
Changhsingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
254.24

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing