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Waxi Formation
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Waxi Fm base reconstruction

Waxi Fm

Period: 
Neoproterozoic

Age Interval: 
late-Early Qingbaikouan (early-middle Tonian), Qb (52, 53, 56)


Province: 
Guizhou

Type Locality and Naming

East Guizhou. The Waxi Fm was named by Wang Yangeng et al. in 1974. The type section is in Waxi Village, at east sector of Fanjing Mountain, Guizhou Province. Upper formation in the Fanjingshan Gr.

Synonym: （洼溪组）


Lithology and Thickness

The Waxi Fm is of rhythmic layering of greyish, grey-green blasto-sandstone, blasto-siltstone, blasto-tuff, slate and silty slate. Lower part of the formation consists of sandstone, calcareous sandstone and tuff. In the sandstone are developed the oblique bedding and ripple marks. Upper part consists of greyish, grey-green slate and sandy slate. It is recorded 1100 - 1238 m thick.

[Figure: The stratigraphic column of the Fanjingshan Gr (the group is about 1000 m thick). a. Pillow lava of the Huixiangping Fm.; b. The boundary between the underlying Fanjingshan Gr and the Furongba Fm (= lower Jialu Fm?) which is the basal formation of the Xiajiang Gr.]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It conformably contacts with overlying Duyantang Fm

Upper contact

It conformably contacts underlying Tongchang Fm

Regional extent

East Guizhou. It is only developed in Fanjing Mountain, Guizhou Province.


GeoJSON

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Fossils


Age 

SHRIMP U-Pb date of 832 Ma is found in the underlying Tongchang Formation (Wang Min et al., 2012). late-Early Qingbaikouan (early-middle Tonian) – the seven formations of the Fanjingshan Gr spanning the early Qingbaikouan (early Tonian) are given semi-equal durations.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.27

    Beginning date (Ma): 
924.40

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.34

    Ending date (Ma):  
904.80

Depositional setting

Rhythmic layering


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.