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Zhitang Formation
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Zhitang Fm base reconstruction

Zhitang Fm

Period: 
Neoproterozoic

Age Interval: 
Earliest Nanhuan (latest Tonian), Nh (61)


Province: 
Zhejiang

Type Locality and Naming

West-central Zhejiang. The Zhitang Fm was named by Liu Hongyun and Sha Qing'an (1959). The type section is located at Zhitang village, Longyou County, Zhejiang Province.

Synonym: （志堂组）


Lithology and Thickness

The Zhitang Fm consists of three parts above a basal purple-red conglomerate to sandy conglomerate. Lower and Middle parts are tuffaceous siltstone, fine-grained sandstone with tuffite. Upper part is mainly siltstone with silty shale. The Zhitang Formation is 600-800 m thick.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The Zhitang Fm is conformable with the underlying Banxi Gr. [However, schematic stratigraphic column #61 indicates it overlies the Shangshu Fm.]

Upper contact

The top is conformably overlain by the Leigongwu Fm [However, schematic stratigraphic column #61 indicates it underlies the Gucheng Fm tillite of lower Ediacaran.]

Regional extent

West-central Zhejiang.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[119.03,30.09],[119.41,30.19],[119.83,30.18],[120.4,30.04],[120.28,29.82],[119.81,29.43],[119.26,28.95],[118.6,28.56],[118.12,28.26],[117.52,28.18],[116.78,28],[116.41,28.05],[116.02,28.08],[116.06,28.25],[116.26,28.48],[116.85,28.82],[117.09,29],[117.46,29.25],[117.72,29.39],[118.03,29.62],[118.34,29.81],[118.63,29.92],[119.03,30.09]]]]}}

Fossils

Microplants are found in phyllite and interbedded silty shale in Dapokeng villege of Kaihua County, such as: Pulvinomorpha sp., Turuchanica sp., Margominuscula rugosa, Leiopsophosphaera sp., L. densa etc.


Age 

Earliest Nanhuan (latest Tonian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
720.00

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.