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Papai Formation

Papai Fm

Period: 
Triassic

Age Interval: 
early Early Triassic (TJ50)


Province: 
Yunnan

Type Locality and Naming

The type section is located in Papai, Gengma County, Yunnan province and named by Yunnan Geological Survey Brigade in 1985. The Papai Fm originally represented clastic rock deposits in the early Triassic between Cangyuan, Gengma, Yunnan.

Synonym:


Lithology and Thickness

It is a set of yellow-gray to gray-black silty shales, gray-white argillaceous siltstone, and lithic sandstone with a small amount of chert. The maximum thickness is about 154 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It has an unconformable contact with the underlying Permian stratum.

Upper contact

There is no continuous stratum outcropping on it and the contact relationship is unknown.

Regional extent

This formation is only found in the area between Gengma and Cangyuan counties in Yunnan


GeoJSON

null

Fossils

Bivalves: Claraia griesbachi, Leviconcha sp., Promyalina cf. putiatiensis; ammonoid: Lytophiceras sp.


Age 

In 1992, Chengdu Institute of Geology and Mineral Resources and Sichuan Provincial Survey Team determined the age of the formation as the Early Triassic. This lexicon uses the culvert of the original Papai Formation. Schematic stratigraphic section suggests span of Induan through early Olenekian.

Age Span: 

    Beginning stage: 
Induan

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
251.90

    Ending stage: 
Olenekian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
249.24

Depositional setting

Shallow marine


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Sun Xin and Tong Jinnan.