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Gushan Formation
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Gushan Fm base reconstruction

Gushan Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1gs, (29c)


Province: 
Anhui

Type Locality and Naming

Ningwu Basin, south Anhui. This formation was named by Xu Keqin (1962) in Gushan of the Dangtu County, Anhui. The type section is in the No 11 borehole of Gushan (31º20', 118º30'). The reference section is the Tongzushan-Shanbiancun section in Maanshan (31º40', 118º30').


Lithology and Thickness

The Gushan Formation is mostly a group of volcanic rocks. The lower part consists of tuffaceous sandstone and conglomerate, upper part of dacite and andesitic volcanic rocks. Its thickness is various in different places from 130 to 710 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Upper contact

It conformably contacts with the overlying Jiangzhen Fm.

Regional extent

The formation is distributed in the Dangtu, Gushan and Maanshan areas.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[117.47,31.15],[117.57,31.16],[117.63,31.11],[117.68,31],[117.64,30.95],[117.58,30.89],[117.48,30.82],[117.37,30.73],[117.16,30.62],[117.04,30.58],[117.01,30.62],[117.05,30.66],[117.09,30.71],[117.14,30.8],[117.23,30.89],[117.36,31.07],[117.47,31.15]]]]}}

Fossils

The formation yields fossils in clastic interbeds of conchostracans Gushania gushanensis，Yanjietheria cf. sinensis, Y. aff. kyongsangensis, Y. cf. chekiagensis, Eosestheria; ostracods Eucypris, Damonella zhejiangensis, plant Desmiophyllum; spore and pollen Classopollis, Cicatricosisporites, Tugeila; and charophyte Mesochara stiptata.


Age 

Radiometric dates 128.2 to 129.5 => mid-Hauterivian (Guangfu Xing, Jianqing Li, Zheng Duan, Mingxuan Cao, Minggang Yu, Pingli Chu, Rong Chen. Mesozoic–Cenozoic Volcanic Cycle and Volcanic Reservoirs in East China. Journal of Earth Science, 2021, 32(4): 742-765. doi: 10.1007/s12583-021-1476-1).

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
130.77

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
129.55

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao.