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Yingchengzi Formation
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Yingchengzi Fm base reconstruction

Yingchengzi Fm

Period: 
Neoproterozoic

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


Province: 
Liaoning

Type Locality and Naming

Southern peninsula of Liaoning. The Yingchengzi Stage was named by Matsushita (1931). The type section is located at Qipanm- Chayegou, Dalian, Liaoning Province.

[Figure: Column of the Sinian section of Liaodong Peninsula with the Yingchengzi Fm. a-Limestone of the Yingchengzi Fm.; b,c-Molar-tooth structures in the Yingchengzi Fm.; d-seismitic breccia]

Synonym: （营城子组）


Lithology and Thickness

The Yingchengzi Fm is mainly limestone and subdivided into two parts. Lower part is gray thick-bedded micrite limestone and stromatolitic limestone and molar tooth structures. Upper part consists of dark gray medium- to thick-bedded powder-crystalline limestone interbedded with thin-bedded powder-crystalline limestone. Wavy beddings are developed in this formation, with minor oblique wavy beddings, horizontal beddings and unsymmetrical ripple marks, with sedimentary features of scouring surfaces, birds-eye structures and desiccation cracks. The thickness is 117-894 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

The basal dark gray thick-bedded limestone is conformable with the underlying Ganjingzi Fm

Upper contact

Conformably overlain by the Shisanlitai Fm.

Regional extent

Southern peninsula of Liaoning. The Yingchengzi Fm is well distributed in Lüshun and Dalian area, where it thins from south to north, and has scattered exposures in the Fuzhou area.


GeoJSON

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Fossils

Stromatolites: Jurusania cf. cylindrica, Kussiella cf. enigmatica, Inzeria regularis, Colonnella ramifera, Conophyton lijiadunensis, Parajacutophyton jinxianensis, Paraconophyton f. etc.; Microplants: Trematosphaeridium cf. holtedahlii, Laminarites sp., etc.


Age 

Middle (4 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.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
606.14

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
596.52

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.