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
Xingmincun Formation
Click to display on map of the Ancient World at:
Xingmincun Fm base reconstruction

Xingmincun Fm

Period: 
Neoproterozoic

Age Interval: 
Sinian (Ediacaran), Z (25)


Province: 
Liaoning

Type Locality and Naming

Southern peninsula of Liaoning. The Xingmincun Fm was named by Yu Jianzhang (C. C. Yu) by 1959. The naming section is located at Xingmincun Village, Beishan, Jinxian County, Liaoning Province.

Synonym: （兴民村组）


Lithology and Thickness

The Xingmincun Fm consists of three parts. Lower part is gray, brown-gray thin- to medium-thick bedded glauconite-bearing quartz sandstone interbedded with silty shale. Middle part is yellowish-green, purple shale, silty shale with marl. Upper part is gray, black-gray limestone with shale. Quartz sandstone with glauconite in the bottom lies conformably on the underlying Cuijiatun Formation. The lithology of this formation is very stable. It is mainly distributed in Jianxian County, the thickness is up to 341 m in Wangjiatuan, Jinxian County, and it somewhat thins in Beishan, and decreases eastwards to 242 m in Liangshuiwan. The total thickness is 127-341 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

It lies conformably on the underlying Cuijiatun Fm

Upper contact

It is unconformable with Dalinzi Fm

Regional extent

Southern peninsula of Liaoning. Jinxian County, Liaoning Province.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[121.9,39.13],[122.28,39.17],[122.27,39.08],[122.17,38.85],[121.94,38.55],[121.58,38.34],[121.12,38.19],[120.73,38.36],[121,38.81],[121.45,39.03],[121.9,39.13]]]]}}

Fossils

Microplants are Leiopsophosphaera infriata, Lophosphaeridium aff. acietatum, Leiofusa obovata, Leiominuscula minuta, Archaeodiscina xingmincunensis, Nucellosphaeridium fengyangensis, Pseudofavososphaera aff. kepingensis, Pseudo- zonosphaera aff. nucleolata, Tylosphaeridium induratum, Tasmanites uariabilis, T. jinxianensis, Scaphita eniseica, Macroptycha perforata, M. nucleolata, M multiplicata, M. triplicata etc.; Stromatolites: Xingmincunella xingmincunensis, Hunjiangia jinxianensis, Boxonia cf. lissa, Patomia qidingshanensis; Medusa: Cyclomedusa, Paracyclomedusa, Discifera.


Age 

Uppermost (8 of 8) 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. Isotopic dates of 650 Ma (Rb-Sr whole rock) and 579 Ma (K-Ar) are from this formation.

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: 
0.8

    Ending date (Ma):  
558.04

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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