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Changlingzi Formation
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Changlingzi Fm base reconstruction

Changlingzi Fm

Period: 
Neoproterozoic

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


Province: 
Liaoning

Type Locality and Naming

Southern peninsula of Liaoning. The name Changlingzi Fm derived from the Changlingzi Stage named by Matsushita in 1931. The naming locality is situated at Changlingzi village 30 km west of Luda City and the typical section is the Xintaizi to Chengshan section. The reference section is in Paoya in Wafangdian City, Liaoning Province.

Synonym: （长岭子组）


Lithology and Thickness

The Changlingzi Fm is dominated by sandstone, siltstone, sandy shale and shale, which is subdivided into three parts. Lower part is composed of yellowish green shale, siltstone intercalated with thin-bedded quartzose sandstone. Middle part is yellowish thin-bedded gray fine-grained quartzose sandstone, glauconitic sandstone, siltstone and shale. Upper part is gray to yellowish gray medium-bedded calcareous fine-grained sandstone, glauconitic calcareous sandstone interbedded with micritic limestone. Lithologic character is obviously varied for suffering the dynamo-regional metamorphism, In the Lüda area, the Changlingzi Fm is composed of gray to green phyllitic slate, calcareous phyllite intercalated with micritic limestone and calcisiltite, with thickness of 374 to 1573 m. But in Fuzhou area, it is unmetamorphosed, with thickness of 317 to 1096 m.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Basal part, a layer of yellowish green silty shale and siltstone, conformably overlies the underlying Qiaotou Fm.

Upper contact

Conformably overlain by the Nanguanling Fm.

Regional extent

Southern peninsula of Liaoning. The Changlingzi Fm is predominantly distributed in Lüda to Fuzhou areas in the Liaodong Peninsula


GeoJSON

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Fossils

It yields microplants: Leiopsophosphaera densa, L. infriata, L. bullata, L. aperta, L. minor, L. pellucida, Trachysphaeridium simplex, T. cultum, T. hyalinum, T. aff. chihsienense, T. planum,T. incrassatum, T. rugosum, Pseudozonosphaera cf. sinica, Zonosphaeridium minutum, Microconcentrica induplicata, Trematosphaeridium sp., Taeniatum crassum, T. simplex etc.; Vermes: Sabellidites off. cambriensis, Paleolina liaonanensis; macroscopic fossil algae: Tawuia dalensesis, Shouhsienia shouhsienensis, Chuaria circularis.


Age 

Lowest (1 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: 
0.0

    Beginning date (Ma): 
635.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.1

    Ending date (Ma):  
625.38

Depositional setting

The lithologic features of the lower part are dominated by flat-beddings, occasionally occurrence of wave bedding and asymmetric ripple marks. The upper part has wavy bedding and crossbedding, which belongs to the deposit of the neritic facies.


Depositional pattern:  


Additional Information

The whole-rock isochron ages of shale determined by Rb-Sr method include 650±20 Ma and 723±43 Ma, and an Ar-Ar age on illite (by whole melt method) is 776±7 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.