Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Jiuxiao Formation
Click to display on map of the Ancient World at:
Jiuxiao Fm base reconstruction

Jiuxiao Fm

Period: 
Neoproterozoic

Age Interval: 
Earliest Qingbaikouan (earliest Tonian), Qb (57)


Province: 
Guangxi

Type Locality and Naming

Northern Guangxi. The Jiuxiao Fm was named by the Party of Regional Geological Survey, Guangxi Bureau of Geology and Mineral Resources in 1987. The type section is in Jiuxiao Village, Dongxing, Huanjiang County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region). It is the lowermost stratigraphic unit of Sipu Gr (Sibao Gr).

Synonym: （九小组）


Lithology and Thickness

In the type section, the meta-sandstone and siltstone are the dominant elements in the Lower part of the formation, while Upper part is composed of metamorphosed argillaceous rock, mainly grey-green and grey-black leptite, meta-sandstone, schist (phyllite or slate). The exposed thickness is recorded as over 3000 m.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

The formation conformably grades upward into overlying Wentong Fm or is unconformably covered by Baizhu Fm of Danzhou Gr.

Regional extent

It is basically distributed in the Huanjiang and Sipu area, northwestern Guangxi,


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[109.69,24.46],[109.34,24.42],[108.58,24.46],[108.73,24.85],[108.91,25.21],[109.17,25.59],[109.36,25.82],[109.57,26.05],[109.86,26.42],[110.04,26.82],[110.14,27.09],[110.26,27.26],[110.36,27.12],[110.43,26.88],[110.34,26.42],[109.94,25.55],[109.69,24.46]]]]}}

Fossils


Age 

A date of 860±13 Ma was acquired from the overlying Wentong Fm (Li Liyang et al., 2016). Earliest Qingbaikouan (earliest 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: 
0.15

    Ending date (Ma):  
958.00

Depositional setting


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.