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Sanchakou Formation
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Sanchakou Fm base reconstruction

Sanchakou Fm

Period: 
Neoproterozoic

Age Interval: 
Early Sinian (early Ediacaran), Z (29)


Province: 
Henan

Type Locality and Naming

North Qinling Mts (westernmost Henan). The Sanchakou Fm was named by the No. 3 Geological Team of Henan Bureau of Geology and Mineral Resources in 1978 and formally quoted in 1989 (on the Regional Geology of Henan Province). The typical section is situated near Sanchakou (in the north valley of Taowan village) in Luanchuan County, Henan Province.

Synonym: 三岔口组）


Lithology and Thickness

The Sanchakou Fm is a suite of dark gray to gray carbonaceous sericite schist and calcareous conglomerate with a thickness of 230 m


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The basal part rests unconformably (?) with a bed of calcareous conglomerate, on the Taowen Fm or the Meiyaogou Fm of the Luanchuan Gr

Upper contact

The formation underlies conformably (?) the overlying Yuku Formation. However, the relationship of contact with the Taowan and Yuku formations is a controversial issue.

Regional extent

North Qinling Mts (westernmost Henan). The Sanchakou Fm is dominantly distributed in Luanchuan (Sanchakou, Shimiao and Fengzhuang) and Lushi counties.


GeoJSON

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Fossils


Age 

Early Sinian (early Ediacaran) span on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
635.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
586.90

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.