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Doulingao Formation

Doulingao Fm

Period: 
Carboniferous

Age Interval: 
C1 (56, 57), Tournaisian−Visean (early to middle Early Carboniferous)


Province: 
Hunan

Type Locality and Naming

The type section is located at Douling’ao, about 1.5 km southeast of Yantang Town, Xinshao, Hunan. It was named by Tan Zhengxiu et al. in 1987.

Synonym: Douling'ao Fm


Lithology and Thickness

Limestone. Dominated by gray-black thick- and medium-bedded bioclastic limestone and clayey limestone, intercalated with marl and shale, ~100 m thick. From central to southern Hunan, clayey material is decreasing while calcareous material is increasing, and completely disappeared at the Hunan-Guangdong and Hunan-Guangxi borders, in a transition to the Shidengzi Fm.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Tianeping Fm (Tian'eping Fm)

Upper contact

Conformable contact with the overlying Shidengzi Fm

Regional extent

Distributed in central Hunan and part of southern Hunan


GeoJSON

null

Fossils

Brachiopod Finospirifer shaoyangensis zone and Coral Keyserlingophyllum zone


Age 

Tournaisian−Visean (early to middle Early Carboniferous)

Age Span: 

    Beginning stage: 
Tournaisian

    Fraction up in beginning stage: 
0.85

    Beginning date (Ma): 
348.62

    Ending stage: 
Visean

    Fraction up in the ending stage: 
0.12

    Ending date (Ma):  
344.76

Depositional setting

It is interpreted as normal littoral-neritic sediments


Depositional pattern:  


Additional Information


Compiler:  

Tan Zhengxiu