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Kaxiangda Formation
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Kaxiangda Fm base reconstruction

Kaxiangda Fm

Period: 
Permian

Age Interval: 
P3 (60), Changhsingian Stage (latest Late Permian Epoch)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the vicinity of the Kaxiangda area, Tuoba Region 70 km to the east of the Chando County, Tibet. It was named by Zhang Linxin et al., in 1979.


Lithology and Thickness

Clastics. Grey-black siltstone, sandstone, grey calcareous shale and bioclastic limestone. Thickness is 1073 m


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Tuoba Fm

Upper contact

Unconformable below the uppermost Permian volcanics of Xiayacun Andesite Fm

Regional extent

Distributed in the Chando and Mongkang Counties of Tibet and Nangqian County of Qinghai Province.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.24,31.84],[98.5,31.5],[98.78,31.08],[98.91,30.85],[98.98,30.6],[99.05,30.24],[99.09,30.05],[99.18,29.78],[99.26,29.45],[99.28,29.28],[99.12,29.22],[98.97,29.19],[98.73,29.19],[98.6,29.14],[98.49,29.02],[98.29,28.98],[98.1,29.13],[97.88,29.44],[97.54,29.92],[97.04,30.45],[96.52,30.91],[95.83,31.36],[95.54,31.51],[95.43,31.86],[95.49,32.06],[95.57,32.27],[95.86,32.47],[96.17,32.64],[96.38,32.75],[96.65,32.83],[96.91,32.89],[97.23,32.8],[97.67,32.46],[98.02,32.11],[98.24,31.84]]]]}}

Fossils

Abundant marine animal fossils among which the Fusulinida belong to the Palaeofusulina fauna, the corals comprise Waagenophyllum and Asserculinia, etc., and with brachiopods comprising Peltichia, Waagenites, Leptodus, Spinomarginifera, Cathaysia, Tyloplecta, Semibrachythyrina, Oldhamina, etc.


Age 

Changhsingian Stage of the Late Permian 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: 
0.5

    Ending date (Ma):  
253.07

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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