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Liuchapo Formation
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Liuchapo Fm base reconstruction

Liuchapo Fm

Period: 
Neoproterozoic

Age Interval: 
late Sinian (late Ediacaran), Z (54, 56, 59)


Province: 
Hunan, Guizhou

Type Locality and Naming

North-central Hunan. The Liuchapo Fm was named by Wang Chaoxiang (C. J. Wang) and Bian Xiaozeng in 1949, and the typical section is situated north of Liuchapo village in Anhua County, Hunan Province.

Synonym: （留茶坡组）


Lithology and Thickness

Lower part of the Liuchapo Fm is composed of gray thick-bedded chert. Upper part is thin-to medium-bedded chert, and the top part has minor intercalations of calcareous slaty shale, locally with some lenses of limestone and dolomite. The carbonate rock in the lower part increases toward the northwest from Liuchapo in Anhua, and it decreases or is lacking going southward. The thickness of the formation is 2 to 200 m.


Lithology Pattern: 
Chert


Relationships and Distribution

Lower contact

The Liuchapo Fm rests conformably on the underlying Nantuo Fm in central Hunan (column 59), but shown as overlying the early-Sinian (early Ediacaran) Doushantuo Fm in the Guizhou-Hunan border region.

Upper contact

It is conformably overlain by the Cambrian Xiaoyanxi Fm

Regional extent

Guizhou-Hunan border and eastwards to central Hunan Province.


GeoJSON

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Fossils

Its top part was found to yield Sabellidites-like annelid worm fossils.


Age 

late Sinian (late Ediacaran) used here for graphic purposes, because overlies early Ediacaran Doushantuo Fm in Guizhou-Hunan border region.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
567.66

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.