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Samarga Formation
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Samarga Fm base reconstruction

Samarga Fm


Period: 
Cretaceous

Age Interval: 
Late Cretaceous (S-7, S-8)


Province: 
Siberia southeast

Type Locality and Naming

Eastern Sikhote-Alin Basin


Lithology and Thickness

" caldera complexes of volcanic centers characterized by the Samarga Fm (Siyanov Fm) and Bogopol Fm consisting of lava and pyroclastic facies (ignimbrites included) of intermediate-basic and moderately acid compositions" (from Sakhno, V.G., Akinin, V.V. First U-Pb dating of volcanics from the East Sikhote-Alin belt. Dokl. Earth Sc. 418, 32–36 (2008). https://doi.org/10.1134/S1028334X0801008X)


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Disconformably overlies Primorye Gr

Upper contact

Conformably overlain by Bogopol Fm

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[140.5,51.1],[139.1,50.1],[139.2,49.8],[136.5,47.2],[136.6,46.82],[136.2,46.7],[134.8,45],[134,43.4],[135.5,44.5],[136,44.6],[136.9,45.6],[137.4,45.5],[140.1,48.4],[140.5,49.6],[140.5,51.1]]]]}}

Fossils


Age 


Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
77.91

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
69.11

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)