Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Udomi Formation
Click to display on map of the Ancient World at:
Udomi Fm base reconstruction

Udomi 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

It is composed of sandstones, tuffaceous sandstones, siltstones, rhythmic alternation of sandstones and siltstones, gravelstones and conglomerates with a total thickness up to 2400 m


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Disconformity onto Largasu Fm

Upper contact

Uncertain extent of disconformity. Next higher known unit is the Bolba 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 marine bivalves Quadratotrigonia (Transitrigonia) fudsinensis, Ussuritrigonia ussurica, gastropods Ovactaeonella dolium (Turbin, 1994) typical for the Luzhki Fm and distributed in Sikhote-Alin in the middle-upper Albian (Markevich et al., 2000). The presence of fossil plants Gleichenites zippei and Asplenium cf. dicksonianum does not contradict this conclusion.


Age 

Thus, the range of the formation is considered as middle-upper Albian.

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
106.85

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
103.04

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)