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Jing'eryu Formation
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Jing'eryu Fm base reconstruction

Jing'eryu Fm

Period: 
Neoproterozoic

Age Interval: 
Late Qingbaikouan (late Tonian), Qb (19)


Province: 
Beijing, Liaoning, Shandong, Hebei

Type Locality and Naming

Tianjin Municipality. The Jing'eryu Fm comes from the Jing'eryu limestone named by Gao Zhenxi (C. S. Kao) in 1934. The typical section is situated in the Jing'eryu village of Jixian County, Tianjin Municipality.

Synonym: （景儿峪组）


Lithology and Thickness

It is dominated by red, greenish gray, pale blue and grayish brown thin-bedded pelitic and dolomitic micritic limestone. The lowermost part is glauconitic coarse-grained arkose or fine conglomerate. The dolomitic micritic limestone commonly shows lamellar and large wave beddings. Even though the lithology is persistent, the thickness is unstable, commonly varying from 59 to 202 m thick.

[Figure: The limestone of the Jing’eryu Formation in west hill, Beijing]


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

The Jing'eryu Fm rests conformably on the underlying Luotuoling Fm with 30 to 50 m thick glauconitic sandstone.

Upper contact

It unconformably underlies the brecciola of the Cambrian Fujunshan Formation.

Regional extent

It is developed in Beijing, Tianjin, Liaoning, Shandong and Hebei provinces. The Jing'eryu Formation is distributed in the Yanshan Mountain area.


GeoJSON

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Fossils


Age 

Late Qingbaikouan (late Tonian) is schematically implied by the generalized stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
860.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

Depositional setting


Depositional pattern:  


Additional Information

Glauconite K-Ar ages are 853 Ma and 862 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.