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Erdaogou Formation

Erdaogou Fm

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (17)


Province: 
Liaoning

Type Locality and Naming

Northeast Liaoning. The Erdaogou Fm was named by the No. 9 Party of Geology, Liaoning Bureau of Geology and Mineral Resources in 1986. The type locality is near Baijiajie Village, Dadianzi Township, Tieling County, Liaoning Province. Middle (3 of 6) formation of Shyatun Gr.

Synonym: （二道沟组）


Lithology and Thickness

The Erdaogou Fm is dominated by spilite intercalated with minor banded carbonaceous slate. It is composed of vesicular and amygdaloidal spilite and spilite intercalated with banded carbonaceous slate, epidotized and silicified altered rock. The top consists of spilitic-tuffaceous slate and altered brecciated spilitic tuff. It is relative stable in lithological character, but changeable in thickness. It shows slight thickening trend from east to west. The formation, about 1000 m thick


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The base is in conformable contact with underlying Hutouling Fm.

Upper contact

Conformably overlain by the Shimen Fm

Regional extent

Northeast Liaoning. It distributed in the Fanhe drainage area, Liaoning Province.


GeoJSON

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Fossils


Age 

Schematic stratigraphic column shows it spanning the middle Jixianian (middle Calymmian)

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
1,540.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
1,500.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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