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Woniusi Formation
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Woniusi Fm base reconstruction

Woniusi Fm

Period: 
Permian

Age Interval: 
P1 (45), early Cisuralian (early Early Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at the Woniu Temple of Jinji area, Baoshan County, Yunnan Province. It was named by the Yunnan Regional Reconnaissance Party in 1980.


Lithology and Thickness

Composed mainly of grey-green basalt, andesitic basalt and tuff, intercalated with siltstone, tuffaceous sandstone and bioclastic limestone lenses. Thickness is 736.6 m.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Eruptive unconformable contact with the underlying Dingjiazhai Fm

Upper contact

Disconformable or unconformable contact with the overlying Yongde Fm

Regional extent

Distributed in the Baoshan City, Shidian and Yongde Counties. In the Aluotian area of Yongde County the thickness of the formation is of 483 m, southerly to the Jianshan area of Yongde County its thickness is of 36.5 m, but northerly to the Dingjiazhai area its thickness is of 450 m, and further northerly to the Jingji area its thickness is of 768.4 m, indicating a gradual increase in thickness from south to north.


GeoJSON

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Fossils

Yields the Eoparafusulina fauna, including E. pusilla, E. pseudosimplex, Triticites irregularis, T. cf. comptus, Schubertella megasphaerica, etc.; and Brachiopods such as Derbyia, Chonetes, Neospirifer, Orthotichia, etc.;


Age 

Chuanshanian Epoch = early Cisuralian (early Early Permian); Kungurian (Wang et al., 2018). Span of upper Artinskian through lowermost Kungurian according to Shuzhong Shen et al. (2019; China Integrated Strat.).

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
286.91

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
281.51

Depositional setting

It is interpreted as a continental effusive basalt.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing, with additions by Wen Du as modified from Wang X.W. et al., 2018. Stratigraphic Division and Correlation of The Carboniferous and Permian in Yunnan Province. Journal of Stratigraphy, 42(4): 461-467 (in Chinese with English abstract)