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Sashuiyan Formation

Sashuiyan Fm


Period: 
Silurian

Age Interval: 
Upper Ludlow to Lower Pridoli of Silurian (S3-4), (44)


Province: 
Sichuan

Type Locality and Naming

It was named by Jin Chuntai et al in 1989. The type section is at the roadside from Longdanxi to Maliuqiao in eastern part of the Erlangshan Mts. area in western Sichuan Province.

Synonym: (洒水岩组) , Shashuiyan Fm, Sashuiya Fm


Lithology and Thickness

The formation, 177 m thick, is dominated by gray, dark gray lenticular thick-bedded marl, limestone, gray green silty mudstone and thick-bedded bioclastic limestone.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

It conformably overlies the Yanziping Fm.

Upper contact

It is conformably overlain by the Maliuqiao Fm of late Pridoli.

Regional extent

The formation is consistent in lithology, but its thickness varies considerably, only 37 m thick at Liangluxiang in Tianquan Xian, northeast of the type section locality.


GeoJSON

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Fossils

It yields fossils including brachiopods Retziella, Protathyris, Nikiforovaena, Spirinella, Eoschizophoria, etc. and conodont Ozarkodina crispa.


Age 


Age Span: 

    Beginning stage: 
Ludfordian

    Fraction up in beginning stage: 
0.85

    Beginning date (Ma): 
423.08

    Ending stage: 
Pridoli

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
420.87

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Chuanshang and Wang Xiaofeng