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Mankuanhe Formation
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Mankuanhe Fm base reconstruction

Mankuanhe Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2mk, (31a)


Province: 
Yunnan

Type Locality and Naming

The Mankuanhe Formation was erected by the No.16 Geological Team of the Yunnan Bureau of Geology and Mineral Resources in 1964. The type locality for the designation is in Mankuanhe of Zhengdong of the Jiangcheng County, Yunnan. The reference section is from Shigaohe to Daqingshu of the Jiangcheng County of western Yunnan.


Lithology and Thickness

The Mankuanhe Formation is represented by a set of purple red and brown purple red clayey siltstone interbedded with calcareous silty mudstone with fine-grained quartz sandstone. It is about 2923 m in thickness.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Its base is incomplete in the type section. It lies conformably on the underlying Hutousi Fm in the southern area; or unconformably on strata elsewhere.

Upper contact

Its top is overlain unconformably by the Paleogene Mengyejing Fm.

Regional extent

The formation occurs in the Shigaohe-Daqingshu area of the Jiangcheng County of western Yunnan. It is basically persistent in lithology. In the Bengza area of the Puer County, its base contains small amounts of gompholite. In the Shangyong and Dapo areas of the Mengla County, it increases in the amount of fine sandstone and is intercalated with fine-grained cupreous sandstone.


GeoJSON

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Fossils

The formation yields ostracods Eucypris anluensis, Cypridea zhengdongensis, C. cavernosa, Sinocypris zhengdongensis, S. reniformis, Talicypridea xishuangbannanensis, T. subparallela, T. amoena; Charophytes Peckichara dongyangensis, Charites tenuisa, Porochara oblonga, P. anluensis.


Age 


Age Span: 

    Beginning stage: 
Coniacian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
89.39

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
66.04

Depositional setting

It is of fluvial-lacustrine deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao