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Ussuriysk Formation
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Ussuriysk Fm base reconstruction

Ussuriysk Fm

Period: 
Cretaceous

Age Interval: 
mid Cretaceous (S-10)


Province: 
Siberia southeast

Type Locality and Naming

Razdolny depression of southern Primorye Basin (S-10; NW of Vladivostok)


Lithology and Thickness

The Ussuriysk Formation consists of sandstones, conglomerates, siltstones, mudstones and coal with a total thickness of up to 300 m.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Not given; maybe upper Jurassic

Upper contact

Conformable overlain by Lipovtsy Fm of Nikan Gr.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[131.2,42.7],[132.2,43.2],[132.5,43.6],[132,44.2],[132,44.6],[131.3,44.3],[131.2,42.7]]]]}}

Fossils

The flora assemblage of the Ussuriysk Formation includes 35 taxa, among which ferns and conifers are most diverse (Volynets, 2015). The most abundant species are ferns Coniopteris (Dicksonia) burejensis, Onychiopsis psilotoides, Adiantopteris yuasensis and conifers Podozamites tenuinervis and Pseudolarix dorofeevi. The characteristic feature of the assemblage is the presence of the widespread conifer Elatides asiatica (Volynets, 2013). A sporepollen assemblage from the Ussuriysk Formation includes Cicatricosisporites multicostatus, Appendicisporites macrorhyzus, Baculatisporites comaumensis, Foraminisporites asymmetricus, Concavissimisporites asper, C. varriverrucatus, Impardecispora apiverrucata (determination of V.S. Markevich).


Age 

Both the flora and the spore-pollen assemblages suggest the Barremian range of the Ussuriysk Formation (Markevich, 1995; Volynets, 2015).

Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
126.50

    Ending stage: 
Barremian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
121.40

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)