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Nanguanling Formation
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Nanguanling Fm base reconstruction

Nanguanling Fm

Period: 
Neoproterozoic

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


Province: 
Liaoning

Type Locality and Naming

Southern peninsula of Liaoning. The name Nanguanling Fm derived from the Nanguanling Stage named by Matsushita in 1931. The typical section is situated in Nanguanling between Dalian and Jinxian (Xintaizi to Chengshancun section) and the reference section is in Paoya to Yuanjiagou in Wafangdian City in Liaoning Province.

Synonym: （南关岭组）


Lithology and Thickness

The Nanguanling Fm is dominated by limestone and pelitic limestone. The basal part is black gray detrital limestone. Lower part is composed of gray to dark gray thin- to medium-bedded detrital limestone and calcisiltite. Upper part consists of dark gray medium-bedded calcisiltite, detrital limestone intercalated with stromatolite-bearing limestone. It is 145 to 192 m thick in Fuzhou, and 217 to 797 m thick in Luda area.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

It rests conformably on the underlying Changlingzi Fm

Upper contact

It is conformably overlain by the Ganjingzi Fm

Regional extent

Southern peninsula of Liaoning. The Nanguanling Formation is dominantly exposed in Luda and Fuzhou area.


GeoJSON

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Fossils

The Nanguanling Formation was found to have conclusive fossils including vermes Pararenicola huaiyuanensis, Protorenicola baiguashanensis, Huaiyuanella minuta and macroscopic fossil algae Tawuia sinensis etc. In addition, stromatolites include Wuhangshania fuxianensis, Conophyton habuqieerensis, Paraconophyton f. etc. and some disputed medusoid fossils.


Age 

Lower (2 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: 
0.1

    Beginning date (Ma): 
625.38

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
615.76

Depositional setting

The Nanguanling Formation has cross-bedding and monoclinal bedding, locally with wavy bedding, scouring mark, desiccation crack, bird's-eye structures and stylolites, which has been assigned to the transition of littoral to shallow-sea slope facies.


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.