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Malutang Formation
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Malutang Fm base reconstruction

Malutang Fm

Period: 
Devonian

Age Interval: 
D21 (29), Eifelian (early Middle Devonian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at the hillside, 500 m south of Malutang Village in Shidian County, Yunnan Province. It was named by Hou Hongfei and Dong Zhizhong in 1982.

Synonym: Malutang member of Songlingou Fm


Lithology and Thickness

The formation mainly consists of clayey limestone.

The lower part, 50 m thick, is composed of earth-like yellow thin-bedded platy marl and calcareous mudstone intercalated with thin beds or lenses of limestone.

The middle and upper parts, 38 m thick, are mainly gray clayey limestone and bioclastic limestone intercalated with earth-like yellow calcareous mudstone.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The formation is conformably underlain by the crystalline limestone and dolomitic limestone of the Xibiantang Fm.

Upper contact

The formation is overlain by the gray, light-gray medium- to thick-bedded limestone of the Heyuanzhai Fm.

Regional extent

It is distributed in Baoshan and Shidian areas of Yunnan Province.


GeoJSON

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Fossils

The lower part yields brachiopods Strophochonetes.

The middle and upper parts contain abundant brachiopods Emanuella, Aulacella.


Age 

Eifelian (early Middle Devonian); Eifelian to Givetian (Qie et al., 2019)

Age Span: 

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
388.00

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
384.02

Depositional setting

It is interpreted as a quiet basin-marginal environment.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan; Wen Du- modified from Qie, Wenkun, Xueping Ma, Honghe Xu, Li Qiao, Kun Liang, Wen Guo, Junjun Song, Bo Chen, and Jianfeng Lu. 2019. Devonian Integrative Stratigraphy and Timescale of China. Science China Earth Sciences 62 (1): 112–34. https://doi.org/10.1007/s11430-017-9259-9.)