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Uktur Formation
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Uktur Fm base reconstruction

Uktur Fm

Period: 
Cretaceous

Age Interval: 
mid Cretaceous (S-2)


Province: 
Siberia southeast

Type Locality and Naming

Tumnin zone of westernmost Sikhote-Alin.


Lithology and Thickness

The Uktur Formation is subdivided into the lower and upper members (Turbin, 1994). The lower member consists of sandstones intercalated with siltstones, sandstones and lenses of gravelstones with a total thickness of 500 m. The upper member contains siltstones, mudstones, rhythmic alternation of sandstones and siltstones, lenses of conglomerates, gravelstones, spillites and diabases with a total thickness of 3000 m.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

The contact with underlying rocks is unknown.

Upper contact

Conformably overlain by Largasu Fm

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[138,50.4],[138.7,50.6],[139,50.1],[140.5,51],[141.5,52.2],[141.4,52.6],[138,50.7],[138,50.4]]]]}}

Fossils

"The stratigraphic range of the formation is considered as Barremian-lower Albian (Turbin, 1994). Recently an assemblage of foraminifera including Ammosiphonia [=Cribrostomoides] nonioninoides and Cribrostomoides repentinus typical for Aptian-middle Albian has been reported from the upper part of the formation (Marinov and Amelin, 2019)."


Age 


Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
126.50

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
109.39

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Igor N. Kosenko, Jingeng Sha and Boris N. Shurygin (2021). Upper Mesozoic stratigraphy of Sikhote-Alin (Russian Far East) and northeastern China: Non-marine and marine correlations. Part 1: Upper Jurassic-Hauterivian AND 2. Barremian-Aptian. Cretaceous Research, 124: articles 104811 (https://doi.org/10.1016/j.cretres.2021.104811) AND 104812 (https://doi.org/10.1016/j.cretres.2021.104812)