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Kzisuhumu Formation
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Kzisuhumu Fm base reconstruction

Kzisuhumu Fm

Period: 
Neoproterozoic

Age Interval: 
late Sinian (late Ediacaran), Z (11)


Province: 
Xinjiang

Type Locality and Naming

Tieklik region (SW Tarim Basin). The Kzisuhumu Fm was named by Ma Shipeng et al. 1979 and was published by Ma Shipeng in 1989. The typical section is situated in the Kzisuhumu valley of the north slope of the west Kunlun Mountain.

[Figure: Type section of the Kzisuhumu Fm]

Synonym: （克孜苏胡木组）


Lithology and Thickness

Lower part of the Kzisuhumu Fm consists of light gray, reddish purple, greenish gray to greenish yellow, thin- to medium-bedded calcareous sandstone, siltstone and shale intercalated with minor thin-bedded quartzose sandstone and dolomite. Upper part is dominated by gray, red purple, purple gray and roseate dolomite, occasionally intercalated with thin beds of greenish gray glauconite quartzose sandstone. Its thickness is variable and locally the uppermost part or even the whole sequence is absent. The thickest place is in the Xinjiang with 353.4 to 371 m thick; but going westward to Tufuluk valley, the formation is completely denuded.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The Kzisuhumu Fm rests disconformably on the underlying Kurkak Fm

Upper contact

It is unconformably overlain by the Devonian Qizinafu Fm

Regional extent

Tieklik region (SW Tarim Basin). It is mainly distributed in Kzisuhumu valley west of the Xinjiang-Tibet Road and south of Yecheng County, and westward to the Halastan river area.


GeoJSON

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Fossils

The Kzisuhumu Formation yields microplants (totally 35 genera and 51 species), dominated by Micrhystridium poratum, Pseudodiacrodium tenerum, Pseudofavososphaera sp.


Age 

Late Sinian (late Ediacaran) indicated on stratigraphic column. However, in recent years, the Kzisuhumu Formation is reported to have hyolitha (?) and sponge spicules. If this is verified, the age of the formation probably belongs to the Early Cambrian.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
567.66

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

Depositional setting


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.