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Huoshaogou Formation

Huoshaogou Fm

Period: 
Paleogene

Age Interval: 
Early Oligocene, (6a,b)


Province: 
Gansu

Type Locality and Naming

Jiuquan Basin. The naming section is located at Huoshaogou, Yumen City, Gansu. Named by Situ Yuwang and Du Bomin in 1948.


Lithology and Thickness

The upper part is purplish red muddy sandstone and sandy mudstone with grayish white, grayish green and brick-red pebbly sandstone and sandy conglomerate; the lower part is brick-red conglomerate and sandy conglomerate with sandy mudstone. The total thickness is ~400 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It has an unconformable contact with the underlying Lower Cretaceous Xinminpu Gr.

Upper contact

It has a disconformable contact with the overlying Oligocene Baiyanghe Fm.

Regional extent

The formation is mainly distributed at Hongliuxia, Huoshaogou and Shanmacheng in the Yumen area, Jiuquan basin.


GeoJSON

null

Fossils

The Research Institute of Exploration and Development, Yumen Petroleum Administration (1990), thought that the age of the mammal Anagalopsis kansuensis and Mimolagus rodens should be early Oligocene.


Age 

As to its geologic age, Li Yuntong et al. (1984) thought it to be mid-late Oligocene, mainly because the list of the Tapengbulak mammal fauna is included in this formation. Its age was redefined as Paleocene–Eocene in the “Regional Geology of Gansu Province” in 1989. The Research Institute of Exploration and Development, Yumen Petroleum Administration (1990), thought that the age of the mammal Anagalopsis kansuensis and Mimolagus rodens should be early Oligocene. Shown Priabonian and/or earliest Rupelian on China Lexicon strat chart.

Age Span: 

    Beginning stage: 
Priabonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
37.71

    Ending stage: 
Rupelian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
30.60

Depositional setting

It is interpreted as sequence of piedmont-fluviolacustrine deposits.


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.