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Pangduo Gr
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Pangduo Gr base reconstruction

Pangduo Gr

Period: 
Permian

Age Interval: 
P1 (49), Artinskian Stage (middle Cisuralian Epoch; mid-Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the vicinity of the Pangduo Village, Linzhou County, Lhasa Region, Tibet. It was named by Li Pu in 1955.


Lithology and Thickness

Conglomerate. Composed of grey-green intermediate-basic volcanic breccia, quartz-sandstone, black pebble-bearing sandy slate. Thickness is 900 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Uncertain contact relationship with the underlying strata of Carboniferous Lading Gr.

Upper contact

Uncertain contact relationship with the overlying strata of Wululong Fm

Regional extent

Distributed in the vicinity of Lhasa, and the area from Mozhugongka to Naqu County, as well as the area of Buomi to Cayu Counties. In the Laigu area of the Buomi County the exposed Permian System used to be known as the Nacuo Gr (the 3rd Regional Geological Survey Party under the Sichuan Provincial Geological Bureau and the Nanjing Institute of Geology and Paleontology, 1982), among them that part which is corresponding to the Pangduo Gr is also known as the Yinga Fm and the Zhadongcuo Fm (Yin Jixiang, 1980), with a thickness of several hundreds of meters.


GeoJSON

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Fossils

Its upper part yields abundant Brachiopods such as Bandoproductus, Chaiella, Leiorhynchoidea, Paeckmannella, Syringothyris, belonging to the Stepanoviella fauna,


Age 

Longlinian Stage of the Chuanshanian Epoch = Artinskian Stage (middle Cisuralian Epoch; mid-Early Permian)

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
290.51

    Ending stage: 
Artinskian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
283.30

Depositional setting

It is interpreted as glacial marine-facies.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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