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Qudi Formation
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Qudi Fm base reconstruction

Qudi Fm

Period: 
Permian

Age Interval: 
P1 (47), middle Cisuralian Epoch (mid-Early Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Qudi, northwest of Jibian village, Duoma District, Ritu County, Tibet. It was named by Liang Dingyi et al. in 1982


Lithology and Thickness

Clastics. Composed of grey-white quartz-sandstone and pebbled coarse-grained sandstone, black silty slate and a small amount of pebbled slate. Its upper part in the Nazha region contains two layers of limestone lenses. Thickness is 1200 m.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Zhanjin Fm

Upper contact

Conformable contact with the overlying Tunlonggongba Fm

Regional extent

Distributed in the Duoma Region of the Ritu County, Tibet. [GeoJSON put same as the overlying formation]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.82,33.7],[79.58,34],[80.12,34.27],[80.56,34.51],[80.82,34.5],[81.04,34.48],[81.31,34.46],[81.57,34.42],[81.75,34.36],[81.99,34.27],[82.31,34.15],[82.71,34.05],[83.12,33.98],[83.52,33.92],[83.83,33.85],[84.03,33.81],[83.21,33.39],[82.04,32.98],[80.77,33.05],[79.96,33.31],[78.82,33.7]]]]}}

Fossils

Yields the Bivalve Oriocrassatella-Schizodus assemblage, and the Brachiopod Subansiria ranganensis-Neospirifer faciger assemblage, the features of which are similar to those of the fauna found in the Subanxili area. In the Nazha Region the limestone lenses in the upper part of the Qudi Fm yield also Fusulinida represented by Schwagerina, Pseudofusulina, Pamirina, Eoparafusulina, Rugosofusulina and Chalaroschwagerina, being to the Pamirina-Eoparafusulina zone of Fusulinida, being similar to those of the Fusulinida fauna of the Longlinian Stage of the Chuanshanian Epoch in South China.


Age 

Upper part is within 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


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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