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Qingshan Formation

Qingshan Fm

Period: 
Devonian

Age Interval: 
D13 (81), early Early Devonian, D13


Province: 
Yunnan

Type Locality and Naming

The type section is located at 1.5 km southeast of Qingshan village of Eryuan County (100o14’E-25 o 52’N). It was named by 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

Limestone. It is a set of carbonate rock, mainly composed of dark-gray to grayish medium- to thick-bedded with thin-bedded limestone in the lower, light grayish massive limestone in the middle and medium- to thick-bedded limestone with breccia in the upper. The thickness is 384-744 m, locally reaches to 1548 m.


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Disconformable contact to the underlying Silurian Kanglong Fm

Upper contact

Conformable contact with the overlying Lianhuaqu Fm

Regional extent


GeoJSON

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Fossils

The formation yields abundant Corals Favosites sp. Tryplasma hercynica, Tabularia turieensis, Pseudochonophyllum sp. Pseudamplexus fasucularis, Loyolophyllum cerioides; Stromatoporoids Amphipora angusta, Clathrodixtyon simplex; and Brachiopods, bryozoans, bivalves, etc..


Age 

middle Early Devonian. But regional chart and being overlain by Lianhuaqu Fm implies earliest Devonian

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
419.00

    Ending stage: 
Lochkovian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
417.02

Depositional setting

It is interpreted as an open platform facies.


Depositional pattern:  


Additional Information


Compiler: