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
Xibeikulasi Formation

Xibeikulasi Fm


Period: 
Carboniferous

Age Interval: 
C12 (2), early Late Carboniferous


Province: 
Xinjiang

Type Locality and Naming

The type section lies south of Xibeikulasi, Karamay City, Xinjiang. It was named by the No. 5 Team of the Regional Geological Survey Party of Xinjiang Bureau of Geology in 1966.


Lithology and Thickness

Volcanic Tuff, Volcaniclastics and Chert. Dominated by uneven interbeds of thick-bedded to massive tuffaceous sandstone and tuff, intercalated with tuffaceous sandy mudstone, tuffaceous siltstone and tuffaceous breccia, locally intercalated with a suite of pyroclastic rocks such as pudding rock, and with chert and bioclastic rock. Exposed thickness 2700−3416 m.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Unknown: The contact relationships with the underlying strata are unclear. Regionally, the uppermost formation of the underlying Devonian is the Honguleleng Fm

Upper contact

Unknown: The contact relationships with the overlying strata are unclear. Fault contact to the overlying Halaalate Fm.

Regional extent

Distributed only along Zhayier Mt. and Mayili Mt. of western Junggar, where the related structural bodies include the volcaniclastic-rich Tailegula Fm and Baogutu Fm. The Tailegula Fm is composed of gray tuff, chert and pillow basalt, several thousands of meters thick, and yielding radiolarians such as Entactinia spp. The Baogutu Fm is dominated by tuffaceous flysch deposits, yielding brachiopods of the Dewuan Age


GeoJSON

null

Fossils

The bottom contains Brachiopods Avonia sp., Neospirifer sp., Martinia sp., Dielasma sp., Buxtonia sp., Cancrinella sp. and Rhipidomella sp.; Corals Pachyfavosites sp., Australophyllum sp., Amplexus sp. and Cladopora sp. as well as bivalves, bryozoans, crinoid stems, plant fragments, etc.

According to the Conodonts Gondolella donbassica, Neognathodus roundyi, and Gnathodus deffectus; Coral Zaphrentites, Brachiopod Balakhonia sp., etc., it should be of the early Late Carboniferous in age.


Age 

early Late Carboniferous

Age Span: 

    Beginning stage: 
Serpukhovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
330.34

    Ending stage: 
Bashkirian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
319.28

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhang Zixin