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Lichaiba Formation

Lichaiba Fm

Period: 
Silurian

Age Interval: 
Wenlock of Silurian (S1), (38)


Province: 
Yunnan

Type Locality and Naming

Western Yunnan. The Formation was named by the 20th Geological Team of Yunnan Geological Bureau in 1963 and introduced by Wang Jude in 1977. The type locality is located at Lichaiba of Baoshan County, Yunnan Province (99°09′E, 25°14′N).

Synonym: （栗柴坝组）


Lithology and Thickness

It is dominated by red, purple, gray argillaceous limestone, marlstone, interbedded with calcareous shale and siltstone. The thickness of this formation is various in different areas, 272-554 m in Lushui of Baoshan, 59-200 m in Shidian, and 177 m in Zhenkang area.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The formation is conformable with the underlying Renheqiao Fm

Upper contact

The formation is conformable with the overlying Niushiping Fm

Regional extent

It is distributed on Baoshan, Shidian, Fengqing, Zhenkang areas of western Yunnan Province.


GeoJSON

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Fossils

The fossils are abundant，bearing conodonts Hindeodella equidentata, Neoprioniodus multiformis, Ozarkodina media; graptolites Monoclimacis vomerina; M. vomerina subgracilis, Pristiograptus Dubius; trilobites Proetus sp., Meitanillaenus sp., etc.


Age 


Age Span: 

    Beginning stage: 
Sheinwoodian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
432.93

    Ending stage: 
Gorstian

    Fraction up in the ending stage: 
0.0

    Ending date (Ma):  
426.74

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Chuanshang and Wang Xiaofeng