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Hutousi Formation
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Hutousi Fm base reconstruction

Hutousi Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2hts, (31a)


Province: 
Yunnan

Type Locality and Naming

The Hutousi Formation was erected by the Yunnan First Regional Geological Survey Team in 1973. The section for the designation is in Hutousi of Yunlong County of Yunnan.


Lithology and Thickness

The Hutousi Formation is represented by gray white and gray yellow massive, moderately thick-bedded and medium- and fine-grained and coarse-grained sandstone, with cupreous (copper-ore-rich) sandstone. It is monomorphic in lithology, light in color, good sorting of clastic materials, high in maturity and common in copper mineralization, which serve as marker for distinguishing it from the overlying and underlying strata. It is 138 m thick.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It lies conformably on the underlying Nanxin Fm (or synonym/coeval Mangang Fm).

Upper contact

It is disconformably under the Paleogene Mengyejing Fm. It is in conformable contact with the Upper Cretaceous Mamkuanhe Fm in some parts of the southern area.

Regional extent

The formation occurs in Hutousi of the Yunlong County of west Yunnan. It is monomorphic and persistent in lithology and ranges from 0 to 400 m in thickness. It is a cupreous ore bed.


GeoJSON

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Fossils

None listed


Age 


Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
103.68

    Ending stage: 
Turonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
89.39

Depositional setting


Depositional pattern:  


Additional Information

It is of fluvial facies.


Compiler:  

Wan Xiaoqiao