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Xiushui Gr

Xiushui Gr

Period: 
Neoproterozoic

Age Interval: 
Early Qingbaikouan (Early Tonian), Qb (50)


Province: 
Jiangxi

Type Locality and Naming

Northwest corner of Jianxi. The Xiushui Gr was named by the Jiangxi Party of Regional Geological Survey in 1979. The naming section is located at Guanyinge, north of Xiushui Couny, Jiangxi Province. Upward succession of the Guanyinge Fm, Chengshanting Fm, and Dongliukeng Fm.

Synonym: （修水群）


Lithology and Thickness

The Xiushui Gr consists of gray green tuffaceous sandstone and siltstone, slate. Grayish yellow sandstone and conglomerate in the bottom with complicated compositions of pebbles, which are mainly metamorphic rocks. It is 538 m thick.

[Figure: Lithology of Xiushui Gr]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It unconformable with the underlying Anlelin Fm (Jiuling Gr of Mesoproterozoic)

Upper contact

It is unconformable with the overlying Luokedong Fm or Liantuo Fm

Regional extent

Northwest corner of Jianxi. Xiushui county, Jiangxi Province.


GeoJSON

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Fossils

Microplants are found in lower part, Leiominuscula orientalis, Margominuscula aff. tennela, Orygmatosphaeridium exile, Leiopsophosphaera infriata, Trachysphaeridium simplex, T. hyalinum, Synsphaeridium conglutinatum.


Age 

Early Qingbaikouan (Early Tonian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
832.00

Depositional setting

Bouma sequences are found in sandstone and slate.


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.