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Lianhuaqu Formation

Lianhuaqu Fm

Period: 
Devonian

Age Interval: 
D12 (81), middle Early Devonian


Province: 
Yunnan

Type Locality and Naming

The type section is located at 2 km south of Lianhuaqu village of Eryuan County (100o14'E 25o 53'N), Yunnan. It was named by the No.5 Team of the First Yunnan regional Geological Survey in 1973, and was formally published by Zhang Yuanzhi et al. in Yunnan Lithostratigraphy in 1998.


Lithology and Thickness

Clayey limestone. It consists of dark-gray clayey limestone and yellow-grayish shale intercalated with thin-bedded limestone with breccia and siliceous concretions. The thickness is 488.5 m..


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformable contact to the underlying Qingshan Fm

Upper contact

Conformable contact with the overlying Changyucun Fm

Regional extent


GeoJSON

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Fossils

The formation yields tentaculites Nowakia acuaria, Paranowakia intermedia and brachiopods, bivalves, stromatoporoids and plant fragments


Age 

Shown as potentially spanning entire Early Devonian on regional stratigraphic chart.

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
417.02

    Ending stage: 
Emsian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
402.41

Depositional setting

It is interpreted as a deeper shelf facies.


Depositional pattern:  


Additional Information


Compiler: