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Zhulazhagamaodao Formation
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Zhulazhagamaodao Fm base reconstruction

Zhulazhagamaodao Fm

Period: 
Neoproterozoic

Age Interval: 
late Qingbaikouan (late Tonian); Qb (17)


Province: 
Inner Mongolia, Ningxia

Type Locality and Naming

Inner Mongolia-Ningxia border region. The Zhulazhagamaodao Fm was named by Zheng Shaochang (1973), which was published in Ningxia Compiling Group for Regional Stratigraphical Scale (1980), Regional Stratigraphic Scale of North China. The type section is located at north hills of Zhulazhagamaodao in Alxa Zuoqi, Nei Mongol Zizhiqu (Inner Mongolia Autonomous Region).

Synonym: （朱拉扎嘎毛道组）


Lithology and Thickness

The Zhulazhagamaodao Fm consists of flysch-like beds of gray, gray-green metamorphosed sandstone, argillaceous limestone, gray-black siliceous slate interbedded with light gray argillaceous slate. The thickness is 500-900 m


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The basal silty slate of the formation contacts in fault with the underlying Haishenghala Fm

Upper contact

The gray thick-bedded limestone at the top of the formation is unconformably overlain by Quaternary sediments. Regionally, the next younger unit is the late Ediacaran Zhengmuguan Fm.

Regional extent

Inner Mongolia-Ningxia border region. Alxa Zuoqi, Inner Mongolia


GeoJSON

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Fossils


Age 

Shown as late Qingbaikouan (late Tonian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

Depositional setting

It is a flysch-like formation.


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.