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Hongshankou Formation
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Hongshankou Fm base reconstruction

Hongshankou Fm

Period: 
Neoproterozoic

Age Interval: 
early Sinian (early Ediacaran); Z (5, 6)


Province: 
Inner Mongolia, Gansu

Type Locality and Naming

Beishan. The Hongshankou Fm was named by Zhao Xiangsheng in 1984, the typical section is situated in Hongshankou in Ejin Qi, Nei Mongol Zizhiqu (Inner Mongolia Autonomous Region).

Synonym: （红山口组）


Lithology and Thickness

The Hongshankou Fm is dominated by variegated pebbly sandy slate, sandy limestone, crystalline limestone (marble) and dolomite. It locally has basal pebbly dolomitic limestone, dolomitic, siltstone or pelitic, calcareous and carbonaceous shale intercalated with manganiferous shale or manganese ore, which was found to intercalate occasionally with till sheet dominated by marine facies. It has a thickness ranging from 48 to 183 m.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The Hongshankou Fm rests conformably and transitionally on the underlying till-rich Xichangjing Fm

Upper contact

It disconformably underlies the Lower Cambrian Shuangyingshan Fm.

Regional extent

Beishan. Inner Mongolia and northernmost Gansu. The Hongshankou Formation is dominantly exposed in Xichangjing, Hongshankou area in Ejin Qi, Inner Mongolia and sporadically exposed in Zelumu and south of Shuangying Mountain in Gansu Province. It is not so widespread as the Xichangjing Formation.


GeoJSON

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Fossils

On south of Shuangying Mountain, the sequence was found to yield microplants, including Protoleiosphaeridium sp., Leiosphaeridium sp., Laminarites sp., Micrhystridium sp. etc. and sponge spicules.


Age 

early Sinian (early Ediacaran);

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: 
0.25

    Ending date (Ma):  
610.95

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.