Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Qijiaoshan Formation

Qijiaoshan Fm

Period: 
Mesoproterozoic

Age Interval: 
Xishanian (Ectasian), Xs (29)


Province: 
Hubei

Type Locality and Naming

Northeast Hubei border to Henan. The Qijiaoshan Fm was named by the Party of Regional Geological Survey, Hubei Bureau of Geology in 1975 in Qijiao Mt., Hong'an County, Hubei Province. The reference section is in Dengjiawan, Huanpi County, Hubei Province. It is upper-middle formation (3/4) within the Hong'an Gr.

Synonym: （七角山组）


Lithology and Thickness

The Qijiaoshan Fm is subdivided into three parts. Lower part is dominated by graphite schist, dolomitic quartz schist, schistoid quartzite and muscovite schist, intercalated with marble. Middle part consists of muscovite quartz schist, muscovite-albite gneiss and albite-hornblende schist. Upper part is composed of interbedded garnetiferous schist, graphite-garnet-albite-hornblende schist, garnet-hornblende epidote, garnet-hornblendite and quartz schist, with graphite schist and graphite-bearing schistose quartzite in the base. The thickness varies from 3713 to 4181 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Tiantaishan Fm.

Upper contact

The top is conformably overlain by the Ta'ergang Fm.

Regional extent

Northeast Hubei border to Henan. It is distributed in Hong'an, Dawu and Xiaogan counties, Hubei Province.


GeoJSON

null

Fossils


Age 

Schematic stratigraphic section shows spanning Xishanian (Ectasian).

Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,400.00

    Ending stage: 
Ectasian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,200.00

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.