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Mayang Formation
Click to display on map of the Ancient World at:
Mayang Fm base reconstruction

Mayang Fm

Period: 
Permian

Age Interval: 
P1 (53), Asselian-Sakmarian stages (early Cisuralian Epoch; early-Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the vicinity of the Mayang area of the Zhada County, Ali Region, Tibet. It was named by the Regional Reconnaissance Expedition under the Tibetan Geological Bureau in 1987.


Lithology and Thickness

Claystone. Black slate, intercalated with grey-yellow quartz-sandstone, and partially with pebble-bearing slate. Thickness is about 80 m.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

Disconformable or locally unconformable contact with the underlying Jiesheng Gr of the Lower Carboniferous Series (but regionally the next older unit is the Dingbo Gr of Upper Carboniferous)

Upper contact

Conformable contact with the overlying Mangzongrong Fm,

Regional extent

Distributed only in the vicinity of the Mayang area of the Zhada County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.48,33.22],[79.47,32.49],[80.27,31.68],[80.96,30.64],[80.83,30.68],[80.04,31],[79.32,31.73],[78.9,32.44],[78.48,33.22]]]]}}

Fossils

brachiopods such as Neospirifer, Fusispirifer, Aulosteges and Dielasma, etc.; Bivalves which are characterized by the occurrence of the Eurydesma fauna.


Age 

Zisongian Stage of the Chuanshanian Epoch = Asselian-Sakmarian stages (early Cisuralian Epoch; early-Early Permian)

Age Span: 

    Beginning stage: 
Asselian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
298.89

    Ending stage: 
Sakmarian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
290.51

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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