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

Xiukang Fm

Period: 
Permian

Age Interval: 
P (51), Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the Xiukang Village of the Lazi County, Tibet. It was named by Sheng Huaibin in 1984. [NOTE: In this same Lazi and Zhongba region, the Triassic Lexicon also has a Xiukang Fm, which is 200 m of limestone and shale, named by Yin Jixiang in 1983; and currently assigned as early Middle Triassic. Therefore, until this potential mis-dating (?) is resolved, then the Triassic one is given a qualifier-suffix in this Lexicon entry = XiukangTri Fm.]


Lithology and Thickness

Limestone. Composed of light-grey to dark-grey and black medium- and thick-bedded massive limestones, dolomitic limestones and brick-red and fresh grey thin- and medium-bedded bioclastic marls, with a thickness of 200 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

Unclear contact relationship with the underlying strata. Possible next-older regional unit (or coeval) is the Lancuo Fm

Upper contact

Unclear contact relationship with the overlying strata. Next younger regional unit is the Gangjiu Limestone Fm

Regional extent

Distributed in the Lazi County area, Tibet.


GeoJSON

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Fossils

Yields ammonoid fossils such as Neocrimites, Adrianites, Stacheoceras, Timorites, etc


Age 

Lengwuan Stage of the Yangsingian Epoch = Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)

Age Span: 

    Beginning stage: 
Capitanian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
261.94

    Ending stage: 
Capitanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
259.55

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)