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Liubatang Formation
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Liubatang Fm base reconstruction

Liubatang Fm

Period: 
Neoproterozoic

Age Interval: 
Qingbaikouan (Tonian), Qb (46)


Province: 
Yunnan

Type Locality and Naming

Central Yunnan. The Liubatang Fm was named by Deng Jiafan in 1961 and published by the Yunnan Bureau of Geology in 1966.The type locality is the area, south of Liubatang village, Jinning County, Yunnan Province. Coordinate: 24°38´12.6″N; 102°39´22.2″E. Middle formation in Bajie Gr.

[Figure: Type section of the Liubatang Fm]

Synonym: （留坝塘组）


Lithology and Thickness

It is subdivided into two parts. Lower part is composed of mainly black silty and muddy slate and carbonaceous slate, intercalated with siliceous slate and manganese-bearing slate. Its base is composed of purple-red ferruginous conglomerate with iron ore beds. Upward it is replaced by flesh-red thick-bedded dolomite (with stromatolites). Upper part consists of purple-red, yellow-green and pale blue silty slate, argillaceous slate intercalated with dark-grey chert. It is 255 m thick.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

The base of the formation rests disconformably on the underlying Kunyang Gr (Luzhijiang Fm., but in localities it unconformably overlies the Heishan Fm or directly unconformably overlies on lower stratigraphic units like Meidang Fm. [Note: however, the succession of formations within the Kunyang Gr seems rather confused.] Elsewhere in east Yunnan, if the Liubatang Fm is considered as the middle formation within a Bajie Gr, then it is underlain by the lower one of Junshan Fm.

Upper contact

Its top is unconformably overlain by the Chengjiang Fm.

Regional extent

Central Yunnan. The Liubatang Fm occurs in a limited area, being seen in Junshao Village, Anning and in Jinning County.


GeoJSON

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Fossils


Age 

Qingbaikouan (Tonian); but span is uncertain. For graphic purposes, used schematic stratigraphic column with assumption it is the Bajie Gr.

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: 
0.8

    Ending date (Ma):  
776.00

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.