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Zhongloupo Formation
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Zhongloupo Fm base reconstruction

Zhongloupo Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1zl, (25b)


Province: 
Shanxi

Type Locality and Naming

The Zhongloupo Formation was erected by the Shanxi Bureau of Geology and Mineral Resources in 1985. The section for the designation is from Zhongloupo to Caohuan of Zhongzhuangpu of the Hunyuan County of Shanxi.


Lithology and Thickness

The Zhongloupo Formation is characterized by the extreme development of gray purple conglomerate with small amounts of gravel-bearing mudstone. It is 92.3 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

The conformable base of the formation marked by gray purple thick-bedded conglomerate with dark purple red sandy mudstone is distinguished from the underlying Yangtouya Fm marked by yellow gray andesite and rhyolite.

Upper contact

The conformable top is bounded by the appearance of purple red sandy mudstone with light gray sandy conglomerate at the base of the Wangjiagou Fm.

Regional extent

The present formation is mainly distributed in Nanshuitou and Xibolin of Zhongzhuangpu of the Hunyuan County of northeast Shanxi. It is basically persistent in lithology and varies considerably in thickness, for example, about 850 m thick in Zhongloupo, about 500 m in Yangtouya and 200 m near Xibolin.


GeoJSON

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Fossils

None listed


Age 

Shown as estimated early-Valanginian in the older Chinese lexicon stratigraphic column; but implied underlying of Valanginian-dated Zhangjiakou Fm volcanics (assigned as late Valanginian in Xi et al., 2019) at base of this section below the Zhongluopo Fm suggests a younger age of Valanginian-Hauterivian boundary (used here for graphics).

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
131.38

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
128.94

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao