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Largasu Formation
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Largasu Fm base reconstruction

Largasu 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

Siltstones, mudstones, sandstones and their rhythmic alternation, gravelstones, conglomerates, tuffites with a total thickness of 2200 m.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Conformably onto Uktur Fm

Upper contact

It is unconformably overlain by the Udomi 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 formation yields Inoceramus anglicus, I. ex gr. yabei and Hemiaster judinkensis (Turbin, 1994). The foraminiferal assemblage Ammosiphonia beresoviensis e A. nonioninoides besides the index species, including Bathysiphon vitta, Recurvoides cf. leushiensis, Cribrostomoides repentinus, C. ex gr. obesus, Trochammina ex gr. rutherfordi (Marinov and Amelin, 2019) widely distributed in the Albian in the Arctic Realm does not contradict with the middle Albian range of the formation."


Age 

Based on the presence of a middle-upper Albian index species Inoceramus anglicus (Turbin, 1994) and the stratigraphic position, the range of the Largasu Fm is considered as middle Albian.

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
109.39

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
106.85

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)