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Mobin Formation
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Mobin Fm base reconstruction

Mobin Fm

Period: 
Neoproterozoic

Age Interval: 
late-Late Qingbaikouan (late-middle Tonian), Qb （54）


Province: 
Hunan, Guizhou

Type Locality and Naming

Central-westernmost Hunan (border with Guizhou). The Mobin Formation was named by the Hunan Party of Regional Geological Survey in 1980 and formally published on Regional Geology of Hunan Province in 1985. The naming section is situated in Mobin in Huitong County, Hunan Province and the typical reference section is in Xikou of Tianzhu County, Guizhou Province. Upper formation in the Banxi Gr at this location.

Synonym: （漠滨组）


Lithology and Thickness

The Mobin Formation is subdivided into four lithological members. First member is composed of greenish gray and gray metamorphic feldspathic quartzose sandstone, meta-greywacke and conglomerate. Second member is greenish gray, gray and light purple blasto-tuffite intercalated with meta-sandstone and slate. Third member consists of gray and light greenish gray sandy slate and banded slate intercalated with meta-sandstone. Fourth member consists of greenish gray meta-sandstone and slate. The total thickness is 4757 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It rests conformably on the underlying Gaojian Fm

Upper contact

It is conformably overlain by the Jiangkou Fm

Regional extent

Western Hunan (to border with Guizhou).


GeoJSON

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Fossils


Age 

late-Late Qingbaikouan (late-middle Tonian) on schematic stratigraphic column

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
832.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

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.