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Erqingshan Formation
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Erqingshan Fm base reconstruction

Erqingshan Fm

Period: 
Neoproterozoic

Age Interval: 
Early Qingbaikuan (early Tonian), Qb （26）


Province: 
Shandong

Type Locality and Naming

North-central Shandong. The Erqingshan Fm was named by You Wencheng (1979). The type section is located in Erqingshan Hill (2130 upland), Xinxin Town of Cangshan County, Shandong Province. Coordinate: E117º49´00´´; N34 º 49´00´´. Lower-middle formation in Tumen Gr.

Synonym: （二青山组）


Lithology and Thickness

The Erqingshan Fm consists mainly of quartz sandstone, light grey calcareous shale interbedded with muddy limestone with stromatolites, microplants and macrofossils of algae. It is 10-140 m thick. Lower-middle formation in Tumen Gr.

[Figure: The Stratigraphic column of the Tumen Gr (made by Zhang Chuanheng)]

[Figure: Stratification of the Erqingshan Fm in the outcrop]


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

It is conformable onto the underlying Heishanguan Fm or unconformable onto the Taishan Complex or metamorphosed granite pluton.

Upper contact

It is disconformably overlain by the Tongjiazhuang Fm.

Regional extent

North-central Shandong. It is developed in Cangshan County and Anqiu- Juxian County, Shandong Province.


GeoJSON

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Fossils

Microplants and algae fragments have been found in shale.


Age 

Early Qingbaikuan (early Tonian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
972.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
930.00

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.