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Luma Formation

Luma Fm

Period: 
Devonian

Age Interval: 
D13 , Late Emsian (late Early Devonian)


Province: 
Guangxi

Type Locality and Naming

The type section is located at 2 km west of Luma Village in Zhaisha County, Guangxi Zhuangzu Autonomous Region. It was named by Wang Yu, Yu Changmin and Fang Dawei in 1964.


Lithology and Thickness

Marl. It is dominated by marl intercalated with dark-gray limestone, about 300 m thick.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

At bottom, it is separated by marl from the underlying Lianhuashan Fm sandstone in a conformable contact.

Upper contact

Next younger unit on this chart column (Hongfei Hou, Apr 2021) is Sipai Fm

Regional extent

It is mainly restricted in to an area north from Qijian of Jinxiu in North Guangxi; southwards it has a facies transition into the lower part of the Dale Fm.


GeoJSON

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Fossils

It yields abundant coral fossils: Trapezophyllum sp., Favosites sp., Pleurodictyum sp., Lithophyllum sp.


Age 

Late Emsian (late Early Devonian)

Age Span: 

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
393.40

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
392.05

Depositional setting

It is interpreted as near-shore subtidal environment deposits.


Depositional pattern:  


Additional Information


Compiler:  

Hongfei Hou