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Changme Formation
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Changme Fm base reconstruction

Changme Fm

Period: 
Permian

Age Interval: 
P1 (81), Artinskian Stage (middle Cisuralian; mid-Early Permian).


Province: 
Guangxi

Type Locality and Naming

The type section is located in the Changme Village 20 km to the south of the Longlin County Town, Guangxi. It was named by You Jiarong in 1982.


Lithology and Thickness

Limestone. Light-grey and grey massive limestones, intercalated with algal limestone. Thickness is 50-70 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Conformable contact with the light-grey limestone of the underlying Maping Fm.

Upper contact

Conformable contact with the grey limestone of the overlying Qixia Fm.

Regional extent

Distributed in the alignment of Ceheng-Ziyun- and-Wangmo areas.


GeoJSON

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Fossils

Fusulinida fossils such as Misellina, Robustoschwagerina, Parafusulina and Pseudofusulina, etc.. Corals represented by Iranophyllum, Wetzellophyllum, etc.


Age 

Longlinian Stage of the Chuanshanian Epoch = Artinskian Stage (middle Cisuralian; mid-Early Permian).

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
290.51

    Ending stage: 
Artinskian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
283.30

Depositional setting

It is interpreted as platformal-margin facies.


Depositional pattern:  


Additional Information

The boundaries of the formation are determined mainly on the basis of biologic fossils, since lithologically the formation is difficult to be differentiated from both its neighboring overlying and underlying rock formations, so it actually belongs to the known Houziguan Limestone.


Compiler:  

Xiao Weimin