Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Jinshanzhai Formation
Click to display on map of the Ancient World at:
Jinshanzhai Fm base reconstruction

Jinshanzhai Fm

Period: 
Neoproterozoic

Age Interval: 
middle Sinian (middle Ediacaran), Z (27)


Province: 
Anhui

Type Locality and Naming

North Anhui. The Jinshanzhai Fm was named by the Jiangsu and Anhui Parties of Regional Geological Survey in 1976 and was formally published on the Guidebook of 1: 200 000 Scale Geological Map of Xuzhou in 1978. The typical section is situated at Jinshanzhai in Langan Township of Suxian County, Anhui Province.

Synonym: (金山寨组）


Lithology and Thickness

Lower part is composed of gray shale intercalated with thin-bedded fine-grained sandstone, with a bed of basal conglomerate. Upper part consists of grayish yellow and purple red thick-bedded glauconitic limestone, bearing lenses of stromatolite-bearing limestone, with bluish gray thin-bedded limestone at top. It is 12-67 m in thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The basal part, a 0.7 m bed of grayish red to black conglomerate, rests disconformably on the underlying Wangshan Fm

Upper contact

The top, with bluish gray thin-bedded limestone, is conformably overlain by the Gouhou Fm

Regional extent

North Anhui. The Jinshanzhai Formation is mainly exposed in Jiagou, Langan, Chulan of Suxian County and in Mandingshan of Suixi County, and it is over 20 m thick.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[116.94,34.46],[117.37,34.45],[118.05,34.39],[118.13,34.24],[117.97,33.91],[117.63,33.61],[117.16,33.5],[116.8,33.62],[116.64,34.13],[116.94,34.46]]]]}}

Fossils

The upper part has stromatolites, including Acaciella multia, A. gouhouensis, Boxonia jinshanzhaiensis, Inzeria intia, Xiejiella formosa, X. nodosa, Jinshanzhaiella pulchellusa, Jinxianella jinxianensis. Macroscopic fossil algae: Chuaria circularis. Microplants: Trachysphaeridium simplex, Nucellosphaeridium sp., Brochopsophosphaera sp., Synsphaeridium conglutinatum. Wormes: Calyptrina striata, Chulania anfracta, Suxiania jinshanzhaiensis, Lushania aciephalus.


Age 

Uppermost (10 of 10) in a succession of eight formations spanning early through middle Sinian (early through middle Ediacaran) formations according to assigned "Z" code and schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
567.66

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.77

    Ending date (Ma):  
560.93

Depositional setting


Depositional pattern:  


Additional Information

According to the data reported by Xiao Ligong and Zhou Benhe in 1984, in the stromatolite-bearing limestone in the lower part of the Jinshanzhai Formation there were small shelly fossils Actinotheca and Eifferia. Therefore, the Jinshanzhai and Gouhou Formation were considered to belong to the Lower Cambrian. In contrast, there is a glauconite KAr age of 647 Ma and illite Rb-Sr age of 649 Ma.


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.