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Wangjiagou Formation
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Wangjiagou Fm base reconstruction

Wangjiagou Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1w, (25b)


Province: 
Shanxi

Type Locality and Naming

The Wangjiagou Formation was erected by the Shanxi Bureau of Geology and Mineral Resources in 1989. The section for the designation is from Zhonggulou to Caohuan of the Zhongzhuangpu township of Hunyuan County, Shanxi. [There is also a "Wangjiagou Fm" in Gansu (Devonian); but not used in this Lexicon.]


Lithology and Thickness

The Wangjiagou Formation is mainly represented by a set of purple red and gray white sedimentary rocks intercalated with volcanic rocks and pyroclastic rocks, which is roughly divided into two members. Lower member is dominated by purple red sandy mudstone with basalt. Upper member is built up by gray white rhyolitic volcanic breccia, tuff and rhyolite. It is 262.2 m thick.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The base of the formation marked by purple red sandy mudstone with light gray sandy mudstone is distinguished from the underlying Zhongloupo Fm marked by gray green thick-bedded conglomerate with sandy mudstone. The Wangjiagou Formation lies conformably on the underlying strata.

Upper contact

The top is bounded by the appearance of light gray red and gray white conglomerate with gravel-bearing sandy mudstone at the base of the Caohuan Fm. The Wangjiagou Formation lies unconformably under the Caohuan Formation.

Regional extent

The present formation is only distributed in the Wangjiagou-Caohuan area of the Zhongzhuangpu township of Hunyuan County of northeast Shanxi.


GeoJSON

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Fossils

None listed


Age 

Shown as estimated late-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 late-Hauterivian (used here for graphics).

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
128.94

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
126.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao