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Dongmen Formation
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Dongmen Fm base reconstruction

Dongmen Fm

Period: 
Neoproterozoic

Age Interval: 
Early Nanhuan (latest Tonian – early Cryogenian), Nh （50）


Province: 
Jiangxi

Type Locality and Naming

Northwest corner of Jianxi. The name Dongmen Fm derived from the Dongmen Sandstone named by Wang Zhuquan (C. C. Wang) in 1930 and was renamed as the Dongmen Formation by the Jiangxi Party of Regional Geological Survey in 1974 (In: Geology of Jiangxi Province, 1982). The typical section is located in Dongmen, Henglu, Wuning County, Jiangxi Province.

Synonym: （硐门组）


Lithology and Thickness

In the naming area, the Dongmen Fm is dominated by a suite of grayish green to grayish white quartzose sandy conglomerate and pebbly sandstone, with more than 40 m of thick to mega-bedded quartzose sandstone at the base. There, the Dongmen Fm is about 161 m thick.

Near Renjiapu in Xiushui County, the Lower part is composed of dark gray to grayish green coarse-grained arkosic sandstone intercalated with fine sandstone, siltstone and mudstone. The Upper part consists of grayish green medium-to thick-bedded fine sandstone, siltstone and mudstone, locally with chert. The thickness varies from 450 to 500 m.


Lithology Pattern: 
Aus conglomerate


Relationships and Distribution

Lower contact

The base unconformably overlies the underlying Shangshuangjiaoshan Group or the Luokedong Group.

Upper contact

Indicated on stratigraphic column as overlain by the Nantou Fm (latest Cryogenian; Marinoan).

Regional extent

Northwest corner of Jianxi. Wuning County, Jiangxi Province.


GeoJSON

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Fossils


Age 

Early Nanhuan (latest Tonian-early Cryogenian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
677.50

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.