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Nashui Formation
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Nashui Fm base reconstruction

Nashui Fm


Period: 
Permian

Age Interval: 
P1-2 (79), Artinskian to middle Kungurian Stage (middle and late Cisuralian Epoch; middle- and late-Early Permian)


Province: 
Guizhou

Type Locality and Naming

The type section is located by the Highway between the South of the Nashui Village and the Sanglang area of the Wangmo County about 35 km to the southwest of the Luodian County Town, Guizhou Province. It was named by Xiong Jianfei et al. in 1985.


Lithology and Thickness

Limestone. Composed essentially of dark-grey and grey thin-bedded and medium-bedded weakly silicified micrites, containing bioclastic micrite, intercalated occasionally with black organic-rich claystone, and a small amount of bioclastic grainstone, or grainstone and calciruditic graded-bed limestone lenses. Among them the micrite yields a small amount of Radiolaria, calcispheres and Ostracoda, and is possessed of plastic and drag-slip structures. The bioclastic limestones are all composed of bioclastics and a small amount of lithoclastics which have been transported there from the carbonate platform, with the clastics being irregularly plastically and skewedly concentrated or in an orientated arrangement, and being possessed of positive graded bedding. Thickness is commonly of 20-60 m, and being thicker in the north than in the south.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Nandan Fm (= Xiaolangfengguan Fm).

Upper contact

Conformable contact with the overlying Sidazhai Fm.

Regional extent

The formation is distributed in a region to the south of an alignment of the Ceheng, Wangmo, Ziyun and Luodian Counties, still southerly up to the territory of Guangxi Zhuang Autonomous Region and northerly with a facies change taking place in the middle part of the Houziguan Limestone. In the Saiwa section the formation is composed largely of dark-grey and grey-black organic claystones, secondly of clayey limestone, micritic radiolarian limestone, bioclastic and interclastic limestones and a small amount of radiolarian siliceous rocks and claystones, with the marl yielding primary ammonoid fossils, with a thickness commonly of 100-200 m, and with the greatest thickness reaching as many as 300 m in a narrow and elongated delta area extending from the Shazigou of the Zhenning County to Saiwa of the Ziyun County.


GeoJSON

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Fossils

Radiolaria, calcispheres, Ostracoda and ammonoids.


Age 

Time range from the Longlinian Stage to the Luodianian Stage of the Early Permian Epoch = Artinskian to middle Kungurian Stage (middle and late Cisuralian Epoch; middle- and late-Early Permian)

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
290.51

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
278.84

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua

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