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Fulu Formation
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Fulu Fm base reconstruction

Fulu Fm

Period: 
Neoproterozoic

Age Interval: 
late Nanhuan (middle Cryogenian), Nh （56, 57）


Province: 
Guangxi, Guizhou

Type Locality and Naming

Northernmost Guangxi. The Fulu Fm was named by Wang Yuelun in 1936, and the typical section is situated in Fulu and Liuhe of Sanjiang County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region).

Synonym: （富路组）

[Figure: Type section of the Fulu Fm]


Lithology and Thickness

The Fulu Fm is chiefly composed of light gray, grayish purple, grayish green greywacke arkosic sandstone intercalated with minor arkosic sandstone, arkosic greywacke, siltstone, sandy slate, black slate and locally dolomite. The sandstone developed horizontal stratifications, oblique beddings, wavy beddings and ripple marks. The basal part is ferruginous sandstone and shale intercalated with banded hematite, and a basal conglomerate and sandstone. The total thickness varies from 80 to 875 m; and eastward, the thickness decreases and mudstone increases.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It rests disconformably on the underlying Chang'an Fm with an obvious erosion gap, but some literatures considered that it is a conformable contact.

Upper contact

Indicated on schematic stratigraphic column of this region as being overlain by the Nantou Fm tillite.

Regional extent

Guizhou, Guangxi provinces.


GeoJSON

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Fossils


Age 

late Nanhuan (middle Cryogenian). Bounded by the two Cryogenian glacial units; so placed here as the interglacial in the Cryogenian

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
660.50

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
0.94

    Ending date (Ma):  
640.10

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.