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Bolba Formation
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Bolba Fm base reconstruction

Bolba Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous (S-1, S-2)


Province: 
Siberia southeast

Type Locality and Naming

Gorin and Tumnin zones of westernmost Sikhote-Alin. "The Bolbinsk Formation was first distinguished and described by B.Ya. Abramson in 1956 on the right bank of the Amur River, in the area of the Bolbinsk Cliff (between Tsimmermanovka and Sofiiskoe villages." (quoted from Alexey Yu. Martynov et al., 2019. Lateral Zonality of the East Sikhote-Alin Volcanic Belt: Geodynamic Regime in the Late Cretaceous. Russian Journal of Pacific Geology, 13: 265-282.)

Synonym: Bolbinsk Fm.


Lithology and Thickness

"In the stratotype section, the base of the Bolbinsk Formation is made up of tuff conglomerates intercalated with tuffstones, andesite tuffs, and tuffites, 20.6 m thick. Upsection, they grade into andesite flows separated by numerous horizons of volcanosedimentary rocks: tuff conglomerates and tuffstones. The total thickness of the formation is estimated to be 400 m." (quoted from Alexey Yu. Martynov et al., 2019. Lateral Zonality of the East Sikhote-Alin Volcanic Belt: Geodynamic Regime in the Late Cretaceous. Russian Journal of Pacific Geology, 13: 265-282.)


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Conformable onto Utitsa Fm in Gorin zone. Uncertain extent of disconformity in Tumnin zone; but next older named formation is the Udorni Fm.

Upper contact

Disconformably overlain by the Tatarka Fm

Regional extent

East Sikhote Alin volcanic belt (~500 km long)


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
91.65

    Ending stage: 
Santonian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
84.68

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)