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Sanlengshan Formation

Sanlengshan Fm

Period: 
Carboniferous

Age Interval: 
C21−C12 (), late Early to early Late Carboniferous


Province: 
Hainan

Type Locality and Naming

The type section lies on the southeast slope of Sanling Hill, Shilu Iron Mining District, Changjiang County, Hainan. It was named by the South China Scientific Research Team for High-grade Iron Ore, Chinese Academy of Sciences in 1976, and published in 1986.


Lithology and Thickness

Claystone and Sandstone. Yellow-brown, gray and gray-black slate and sandstone, with conglomerate and sandy conglomerate at bottom. Thickness >70 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unknown: It is in faulted contact with the underlying strata

Upper contact

Unknown: Top unseen

Regional extent


GeoJSON

null

Fossils

Containing Plants Neuropteris?, Pecopteris? and Rhodeopteridium,


Age 

late Early Carboniferous to early Late Carboniferous

Age Span: 

    Beginning stage: 
Serpukhovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
330.34

    Ending stage: 
Bashkirian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
315.15

Depositional setting

It is interpreted as littoral-lagoon deposits


Depositional pattern:  


Additional Information

Original lexicon entry also said that the fossils included "Graptolite Dictyonema". However, graptolites became extinct in Early Devonian, and "Dictyonema" is a Silurian form; therefore this identification is either erroneous or redeposited!


Compiler:  

Wang Xiangdong