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
Qitadaban Formation
Click to display on map of the Ancient World at:
Qitadaban Fm base reconstruction

Qitadaban Fm

Period: 
Neoproterozoic

Age Interval: 
lower Qingbaikouan (lower Tonian), Qb (14)


Province: 
Qinghai, Gansu

Type Locality and Naming

Middle Qilian (north-central Gansu-Qinghai border region). The Qitadaban Formation was named by Qian Jiagi in 1986. The typical section is situated in Qitadaban in Subei County and the reference section is in Hua'erdi in Subei County in Gansu Province (bounded with Tianjun County, Qinghai Province). Lowest formation in Gongcha Gr.

Synonym: （其他大阪组）


Lithology and Thickness

The Qitadaban Fm is dominantly composed of purple to grayish purple feldspathic quartzose sandstone and siltstone interbedded with grayish yellow to greenish gray medium to fine-grained quartzose sandstone, siltstone and argillite, which formed as thin to medium-bedded rhythmites. The color grades upward from purple to gray, then to greenish gray and black. There is an upward increase in the sandy component and maturity. The thickness is from 1055 to 1310 m


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The lower part rests disconformably on the Hua'erdi Fm (Huaerdi Fm), uppermost formation in the Tuolainanshan Gr

Upper contact

The upper part conformably underlies the Wugeshan Fm

Regional extent

Middle Qilian (north-central Gansu-Qinghai border region). With a trend of NW to SE, the Qitadaban Formation is distributed in a belt area from Hudonggou to Chaganburgas, extending southeast to Hua'erdi and Wugeshan in Qinghai Province.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[94.72,39.32],[95.69,39.39],[96.48,39.3],[97.4,38.89],[98.45,38.55],[100.77,37.59],[101.81,37.06],[104.03,36.91],[105.01,36.72],[105.91,36.06],[106.25,35.4],[106.07,34.9],[104.76,34.64],[100.92,35.77],[97.58,37.03],[94.53,38.22],[92.81,38.53],[94.72,39.32]]]]}}

Fossils

The Qitadaban Formation yields microplants dominated by Trachysphaeridium incrassatum, T. simplex, T.cultum, T. chihsienense, Pseudozonosphaera uerrucosa, Asperatopsophosphaera umishanensis, Polyporata obsoleta, P. microporata etc.


Age 

lower Qingbaikouan (lower Tonian)

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
944.00

Depositional setting


Depositional pattern:  


Additional Information

Its paleolatitude in 3.8°N , and the paleomagnetic pole is 39.5°λ and 22.6°λ.


Compiler:  

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