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Wangjiacun Formation
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Wangjiacun Fm base reconstruction

Wangjiacun Fm

Period: 
Devonian

Age Interval: 
D12-3 (29), Pragian to Emsian (Early Devonian)


Province: 
Yunnan

Type Locality and Naming

The type section is located Xiangyangsi, west of Shidian County, Yunnan. It was named by the No 3 branch Team of yunnan No 1 Team of Regional Geological Survey in 1980, and Tan xuechun, Dong zhizhong, Qin Dehou formally quoted it in 1982.


Lithology and Thickness

Carbonate rocks. It is composed of grayish-black medium- to thick-bedded silty limestone, grayish-yellow calcareous sandstone and silty mudstone intercalated with quartz sandstone.

It is about 100 m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The formation conformably rests on purplish-red sandy limestone intercalated with calcareous siltstone of Xiangyangsi Fm.

Upper contact

The formation is overlain by dolomite of Shabajiao Fm.

Regional extent

This formation is distributed in Baoshan, Shidian area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.7,26.69],[98.95,25.89],[99.47,25.07],[99.54,24.51],[99.02,23.72],[98.87,23.65],[98.76,23.85],[98.64,23.96],[98.82,24.04],[98.94,24.15],[98.81,24.21],[98.62,24.14],[98.33,24.08],[97.97,24.03],[97.82,23.91],[97.74,23.86],[97.66,23.95],[98.63,24.85],[98.7,26.69]]]]}}

Fossils

The lower part has tentaculites Nowakia acuaria zone; and graptolites Monograptus Yukonensis zone; and the upper part has conodonts of dehisens zone.


Age 

Pragian to Emsian (Early Devonian); Lochkovian to Pragian (Qie et al., 2019)

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
413.06

    Ending stage: 
Pragian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
410.89

Depositional setting

It is interpreted as a deep-water basin facies.


Depositional pattern:  


Additional Information

The Wangjiacun Fm is similar to the underlying Xiangyangsi Fm in lithological character, but they can be differentiated by color, the Wangjiacun Fm is grayish-black to grayish yellow, and the Xiangyangsi Fm is purplish-red before weathering.


Compiler:  

(Xian Siyuan; Wen Du- modified from Qie, Wenkun, Xueping Ma, Honghe Xu, Li Qiao, Kun Liang, Wen Guo, Junjun Song, Bo Chen, and Jianfeng Lu. 2019. Devonian Integrative Stratigraphy and Timescale of China. Science China Earth Sciences 62 (1): 112–34. https://doi.org/10.1007/s11430-017-9259-9.)