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Laohuao Formation

Laohuao Fm

Period: 
Devonian

Age Interval: 
D22-D31 ,late Middle Devonian to early Late Devonian (73)


Province: 
Guangdong

Type Locality and Naming

The type section is located at Laohuao in Taishan County, Guangdong Province. It was named by Zhang Youzheng in 1959.


Lithology and Thickness

It is dominated by clastic rocks and bears non-marine, or occasionally marine, fossils.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It has conformable contact to the underlying Laohuao Fm.

Upper contact

It has conformable contact to the overlying Tianziling Fm.

Regional extent

It is distributed mainly in the areas east of Renhua—Qujiang-- Wengyuan and south of Fogang and Guangning.


GeoJSON

null

Fossils

It contains plant fossils that are quite similar to Protolepidodendron scharyanum flora. In 1962, at the top of the Laohuao Fm (only 3-6 m below the Cyrtospirifer-bearing Tianziling Fm) in Huangzhukeng Reservoir of Shenjing, Taishan County yielded big fish fossils of Bothriolepis sp. and some complete fish bone. In terms of stratigraphic position, it may be higher than the bed yielding B. kwangtungensis in the north of Guangdong.


Age 

late Middle Devonian to early Late Devonian

Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
371.10

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)