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Shinao Formation

Shinao Fm

Period: 
Paleogene

Age Interval: 
Late Eocene , (19d)


Province: 
Guizhou

Type Locality and Naming

The naming section is located at Shinao Village, Panxian, Guizhou Province. Named by Shen Zhida in 1981.


Lithology and Thickness

Dominantly a sequence of calcareous mudstone or mudstone and lime conglomerate, the middle part of which is intercalated with thin beds of lignite and lime mudstone. The total thickness is 500–600 m.


Lithology Pattern: 
Continental marl


Relationships and Distribution

Lower contact

It has an unconformable contact with the underlying Middle Triassic Guanling Fm (marine reptile-rich formation) of grayish yellow muddy limestone.

Upper contact

It has an unconformable contact with the overlying Pleistocene sandy conglomerate.

Regional extent


GeoJSON

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Fossils

The fossil mammals in this formation were identified by Miao Desui (1982) to include Pygmaetian panxianensis, Qianohippus magicus, Lophiomeryx shinaoensis and L. gracilis.


Age 

From the faunal assemblage, the age of perissodactyles is neither older than Middle Eocene nor younger than Late Eocene, while Lophiomeryx has not been found yet in pre-Late Eocene strata; therefore, Miao Desui thought that the age of the Shinao Formation is probably Late Eocene.

Age Span: 

    Beginning stage: 
Priabonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
37.71

    Ending stage: 
Priabonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
33.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.