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Yuanxi Formation

Yuanxi Fm

Period: 
Triassic

Age Interval: 
Late Early Triassic (TJ97a)


Province: 
Jiangxi

Type Locality and Naming

Kong Cunli was named in 1988. The named section is located in Yuanxi, Huanghe Township, Shangrao County, Jiangxi Province.

Synonym: This set of strata was previously referred to as Daye Formation or Daye Group (Compilation Group of Jiangxi Regional Stratigraphic Table, 1980 ;Jiangxi Bureau of Geology and Mineral Resources, 1982).


Lithology and Thickness

It is composed of yellowish-brown, pink, grey, grey-green mudstone, siltstone and fine sandstone. Its thickness ranges from 152 to 730 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Tieshikou Fm

Upper contact

Overlain conformably by the Yangjia Gr

Regional extent

The Yuanxi Formation represents the Early Triassic Olenekian clastic deposits in northeastern Jiangxi. Coeval with Xiangcheng Fm in same general region.


GeoJSON

null

Fossils

Tirolites sp. -Eumorphotis inaequicostata- Pteria cf. murchisoni-Neospathodus homeri zone


Age 


Age Span: 

    Beginning stage: 
Olenekian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
249.88

    Ending stage: 
Olenekian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
246.70

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhang Shunxin, Zhou Ze and Tong Jinnan.