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Sigou Formation
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Sigou Fm base reconstruction

Sigou Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2 , (33c)


Province: 
Henan

Type Locality and Naming

Xichuan basin. Zhou Shiquan et al erected the Sigou Formation in the report on the red beds of the Xichuan basin of Henan (unpublished). The section for the designation is from Heidouya to Dongxisi of Taohe of the Xichuan basin of Henan. The Sigou Formation was quoted by the Henan Bureau of Geology and Mineral Resources.


Lithology and Thickness

The Sigou Formation is represented by brown red gravel-bearing clayey sandstone and sandy mudstone. The Sigou Formation is 360.67 m thick.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Its base a conformable contact marked by gray white and gray yellow conglomerate is distinguished from brown red silty mudstone of the underlying Majiacun Fm.

Upper contact

Its top is not observed.

Regional extent

The formation occurs in NW direction in Xixia, Xichuan, Liguanqiao and Liuquanpu of Zhenping of west Henan. It varies considerably in lithology. In the Xixia basin, it increases in the amount of conglomerate and decreases in the amount of siltstone and mudstone from east to west, and varies considerably in thickness (600-50 m). In Xixia it yields sporopollen grains such as Schizaeoisporites sp., Lygodiumsporites sp., Translucencipollis striatus, and richly bears amber ores. It is assigned to Late Cretaceous in this lexicon.


GeoJSON

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Fossils

The formation yields abundant Dinosaurian eggs of the Elongatoolithus-Mocroolithus assemblage; Charophytes Obiusochara brevicylindrica, Aclistochara sp.


Age 

It is assigned to Late Cretaceous. [For graphics, arbitrarily put in Campanin in this succession.]

Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
83.65

    Ending stage: 
Campanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
72.17

Depositional setting

It belongs to diluvial-shore deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao