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Guaizihu Formation

Guaizihu Fm


Period: 
Silurian

Age Interval: 
the Llandovery of Silurian (S1), (19)


Province: 
Inner Mongolia

Type Locality and Naming

It was named by Zheng Shaochang et al in 1987 (please see Zhu Hong et al, 1987). The type section is located at about 500 m away from 40° southeast of the Hongwula triangle survey point in Ejin Banner (Dalain Hob), Nei Mongol Zizhiqu (Coordinate: 103°50′E, 41°29′N). The reference section is at the Danmianshan Mt. area in Ejin Banner (Coordinate: 102°36′54″E, 41°38′58″N).

Synonym: (拐子湖组)


Lithology and Thickness

The formation, 165 m in thickness, can be subdivided into three parts. The lower part--interbeds of thin-bedded siliceous rock with muddy slate; the base--thin-bedded sandy mudstone and hydromica mudstone. The middle part--muddy slate and siliceous rock. The upper part consists of thin-bedded muddy slate.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It is conformed with the underlying Baiyunshan Fm of the Upper Ordovician

Upper contact

It is dis-conformable with the overlying Lower Permian Shuangbaotao Fm.

Regional extent

It is confined in Badain Jaran of western Inner Mongolia in distribution.


GeoJSON

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Fossils

It bears rich graptolite, the main elements of which are as follows: Oktavites spiralis, Monoclimacis griestoniensis, Streptograptus crispus, Spirograptus turriculatus, Rastrites linnaei, Monograptus cf. sedgwickii, Petalolithus palmus, Climacograptus sinuatus, C. cf. miserabilis, Parakidograptus, Pseudoclimacograptus extremus.


Age 


Age Span: 

    Beginning stage: 
Rhuddanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
443.07

    Ending stage: 
Sheinwoodian

    Fraction up in the ending stage: 
0.0

    Ending date (Ma):  
432.93

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Chuanshang and Wang Xiaofeng