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Qiyunshan Formation
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Qiyunshan Fm base reconstruction

Qiyunshan Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2qy, (29c)


Province: 
Anhui

Type Locality and Naming

Huangshan Basin. The name of the Qiyunshan Formation was given by the No 332 Geological Team of the Anhui Metallurgy Bureau (1971) in Qiyunshan of the Xiuning County, Anhui. The type locality is in Qiyunshan of the Xiuning County, represented by the Qiyunshan section in Xiuning of Anhui (29º48', 118º01').


Lithology and Thickness

The Qiyunshan Formation is a group of brownish grey, purple red thick-bedded conglomerate, calcareous sandstone, with intercalations of thin-bedded silty mudstone. It is 207 to 485 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Unconformably overlies the Huizhou Fm.

Upper contact

It unconformably contacts with the overlying Xiaoyan Fm.

Regional extent

This formation is distributed in the Qiyunshan and Dangjinjie areas of the Xiuning County.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[118.99,31.78],[119.09,31.4],[119.05,31.15],[118.92,31.03],[118.73,30.94],[118.55,30.92],[118.31,31.04],[118.27,31.37],[118.37,31.73],[118.67,31.9],[118.99,31.78]]]]}}

Fossils

The silty beds yield fossil plant Sphenopteris, Cladophlebis cf. exliformis; spore and pollen Schizaeoisporites, Cyathidites, Cicatrieosisporites, Inaperopollenites, Psophosphaera, Monosulcites, Quercoidites.


Age 

For graphic purposes, Albian.

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
113.20

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting

The formation belongs to alluvium and shallow lake deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao. Ages from Yu et al. (2020, Mesozoic Thrust-Nappe and Extensional Structure Frameworks in the East Segment of Southeast Yangtze Block, Southeast China. Journal of Earth Science, 31(4): 772-794.)