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Shuhe Formation
Click to display on map of the Ancient World at:
Shuhe Fm base reconstruction

Shuhe Fm


Period: 
Permian

Age Interval: 
P1-2 (66), lower Kungurian Stage (late Cisuralian Epoch; late-Early Permian)


Province: 
Sichuan

Type Locality and Naming

The type section is located at Niuchang, Shuhe Country, Yanyuan County. It was named by the Sichuan Regional Geological Survey Party in 1982.


Lithology and Thickness

Limestone and Clastics. Composed of dark-grey pebbled limestone, intercalated with sandstone and shale, with its basal part consisting of sandstone. It is 30- to 80-m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Maping Fm of the Chuanshanian Epoch

Upper contact

Conformable contact with the overlying Qixia Fm

Regional extent

Occurs only in the Pingchuan, Kuangshanliangzi areas of the Yanyuan County, Sichuan Province.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[101.37,26.59],[101.54,26.75],[101.63,26.89],[101.71,27.08],[101.69,27.28],[101.67,27.48],[101.46,27.53],[101.24,27.28],[101.14,26.86],[101.12,26.55],[101.27,26.45],[101.37,26.54],[101.37,26.59]]]]}}

Fossils

In the Gangou section of the Niuchang area, Shuhe Country, this formation yields such Fusulinids as Misellina sp., Schwagerina sp., Triticites sp., T. paramontiparus mesopachus, T. variabilis, Pseudofusulina sp.; corals such as Caninia sp., Lophocarinophyllum yakovlevi, Wentzellophyllum aff. volzi. In the area extending from the Kuangshanliangzi to the Niuchang Village, it yields the following fossils as well: Fusulinids represented by Armenina sp., Verbeekina sp., Brevaxina sp., Ozawainella sp., Pseudoschwagerina sp., Triticites chui, T. parvulus, T. shikhunensis compactus, Rugosofusulina sp., Quasifusulina sp.; corals represented by Polythecalis sp., Chusenophyllum sp., Szechuanophyllum shuheense, etc. Among the above-mentioned Fusulinid fossils, except for the Schwagerina and Pseudofusulina which represent its common elements for the Early and Middle Permian Epochs, the other elements such as Pseudoschwagerina, Triticites, Rugosofusulina, Quasifusulina, etc. are peculiar to the Chuanshanian Epoch, of which the Pseudoschwagerina, Triticites are zonal fossils for the Chuanshanian Series in the country, and the Misellina coexisting with them is the zonal fossil for the Luodianian Stage of the country. The Shuhe Fm represents pebbled limestone, the fossils of the Chuanshanian Epoch represent products of redeposition, and the age of the Shuhe Fm seems to be of the early Luodianian Stage.


Age 

early Luodianian Stage = lower Kungurian Stage (late Cisuralian Epoch; late-Early Permian); but Lexicon strat-chart shows as late Longlinian (late Artinskian)

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
288.71

    Ending stage: 
Artinskian

    Fraction up in the ending stage: 
0.75

    Ending date (Ma):  
285.10

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Jin Yugan

GeoJSON estimate by Can Cai and Xinyi Zhang (Chengdu Univ. Tech. students)