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Laopu Formation
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Laopu Fm base reconstruction

Laopu Fm

Period: 
Neoproterozoic

Age Interval: 
Late Sinian (late Ediacaran), Z (57)


Province: 
Guangxi, Hunan

Type Locality and Naming

Northernmost Guangxi. The name Laopu Fm derived from the Laopu siliceous bed named by Wang Yuelun (Y. L. Wang) in 1936 and published by Zhao Jinke (Kinghoo Chao) et al. in 1952. It was formally renamed as the Laopu Formation by Guangxi Party of Regional Geological Survey in 1966. The typical section is situated in Silikou in Sanjiang County in Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region).

Synonym: （老堡组）, Laobao Fm


Lithology and Thickness

The Laopu Fm is dominantly composed of chert. Lower part is composed of dark gray thin-bedded chert. Upper part is composed of dark gray thin- to medium- bedded chert intercalated with carbonaceous shale, bearing horizontal beddings and wavy beddings. It has a thickness of 75 m.


Lithology Pattern: 
Chert


Relationships and Distribution

Lower contact

It rests conformably on the underlying Doushantuo Fm

Upper contact

It is conformably overlain by the Cambrian Qingxi Fm (shown as "Qijiangxi Fm" on schematic stratigraphic column).

Regional extent

Northernmost Guangxi and southernmost Hunan. With a persistent lithology, the top part is commonly intercalated with a phosphatic bed near Sanzhai, Mati of Longsheng County and northward to Tongdao of Hunan Province.


GeoJSON

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Fossils

Yields abundant microplants: Trachysphaeridium incrassatum, Pseudozonosphaera uerrucosa, Asperatopsophosphaera partialis, A. rugosa, Pseudodiacrodium aff. uerticale, Hubeisphaera radiata, Paleomorpha figurate, Orygmatosphaeridium rubiginosum, Trachysphaeridium ncrassatum, T. rude, T. planum, T. smplex, Asperatopsophosphaera umishanensis, A. baulensesis, Pseudozonosphaera asperella.


Age 

late Sinian (late Ediacaran) used here for graphic purposes, because overlies early Ediacaran Doushantuo Fm.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
567.66

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.