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Tongjiazhuang Formation
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Tongjiazhuang Fm base reconstruction

Tongjiazhuang Fm

Period: 
Neoproterozoic

Age Interval: 
Middle Qingbaikuan (middle Tonian), Qb (26-b)


Province: 
Shandong

Type Locality and Naming

North-central Shandong. The Tongjiazhuang Fm was named by You Wencheng (1979), which was introduced in 1988. The type section is located in Shisilipu Town of Yishui County, Shandong Province. Coordinate: E118º47´00´´; N35º43´00´´. Middle formation in Tumen Gr.

Synonym: （佟家庄组）


Lithology and Thickness

The Tongjiazhuang Fm consists mainly of quartz sandstone or algae limestone yellow green shale interbedded with muddy limestone with stromatolites, microplants and macrofossils of algae. It is over 291 m thick.

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


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

It is disconformable with underlying Erqingshan Fm or unconformable with Taishan Complex or metamorphosed granite pluton.

Upper contact

It is conformably overlain by the Fulaishang Fm.

Regional extent

North-central Shandong. It is developed in Yishui, Anqiu, Juxian and Changle area, Shandong Province.


GeoJSON

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Fossils

Large amounts of microplants have been found in the shale.


Age 

Middle Qingbaikuan (early-middle Tonian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
930.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
888.00

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.