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Gaojian Formation
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Gaojian Fm base reconstruction

Gaojian Fm

Period: 
Neoproterozoic

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


Province: 
Hunan, Guizhou

Type Locality and Naming

Central Hunan. The Gaojian Fm was named by the Hunan Party of Regional Geological Survey in 1980 and formally published in Regional Geology of Hunan Province in 1985. The typical section is located in Gaojian, Shuangfeng County, Hunan Province. Lower formation in the Banxi Gr at this location.

Synonym: （高涧组）


Lithology and Thickness

The Gaojian Formation was subdivided into three members. Lower member is composed of dark grayish green fine-grained sandstone, siltstone intercalated or interbedded with slate. Middle member is gray to grayish green slate, grayish purple slate and silty slate intercalated with thin-bedded limestone and dolomite. Upper member consists of gray, dark gray or grayish green sericite slate, tuffaceous slate, tuff and minor metamorphic sandstone, tuffaceous sandstone, generally occurrence of a layer of dark gray carbonaceous slate intercalated with grayish green slate. The total thickness is about 2413 m.

[Figure: Lithology of the Gaojian Fm]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The lower part rests unconformably on the underlying Lengjiaxi Gr (Dayaogu Fm?)

Upper contact

Its top is overlain disconformably or conformable by the Chang'an Fm (early Nanhuan) in type area; but conformably overlain by the Mobin Fm in western Hunan.

Regional extent

Western to Central Hunan Province.


GeoJSON

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Fossils


Age 

early-Late Qingbaikouan (middle Tonian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
832.00

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.