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Ulitka Formation
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Ulitka Fm base reconstruction

Ulitka Fm

Period: 
Jurassic, Cretaceous

Age Interval: 
Tithonian-Berriasian (S-3)


Province: 
Siberia southeast

Type Locality and Naming

Western Sikhote-Alin.


Lithology and Thickness

The Ulitka unit comprises dark-grey mudstones-siltstones, rarely tuffaceous mudstones-siltstones, and siltstones, intercalated with rare thin-bedded sandstones and thick alkaline basalts and hyaloclastites with a total thickness of 200 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Overlies an un-named lower-Tithonian unit of siliceous clay

Upper contact

Hiatus, then overlain by Assikaevka Fm

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[137.6,49.4],[134.6,48],[133.9,46.5],[135.3,46.8],[136.3,48],[137.2,48.6],[137.6,49.4]]]]}}

Fossils

This unit, apparently in different stratigraphic intervals, yields Buchia piochii, B. tenuicollis, B. fischeriana, B. ex gr. volgensis, and Thracia sp. indet. (Markevich et al., 2000; Sha et al., 2009). Species B. piochii, B. tenuicollis and B. fischeriana are characterized by a wide stratigraphic range covering the middle Volgian-Ryazanian, however such an assemblage is most typical for the uppermost middle-upper Volgian (=upper Tithonian) (Zakharov, 1981, 1987; Zakharov and Rogov, 2020). B. volgensis is an index species for Berriasian buchia zone (Zakharov, 1981; Zakharov et al., 1997; Nikitenko et al., 2013).


Age 

Therefore, the unit is considered here as uppermost middle Volgian-Ryazanian.

Age Span: 

    Beginning stage: 
Tithonian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
144.64

    Ending stage: 
Valanginian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
135.15

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)