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Machtovaya Formation
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Machtovaya Fm base reconstruction

Machtovaya Fm


Period: 
Cretaceous

Age Interval: 
mid Cretaceous (S-1)


Province: 
Siberia southeast

Type Locality and Naming

Gorin zone of westernmost Sikhote-Alin.

Syonym: Machtovaya unit (which is official name on chart)


Lithology and Thickness

Primorye

"The unit consists of basal tuffaceous conglomerates laterally replaced by tuffaceous gravelstones, tuffaceous sandstones and tuffs, medium-grained sandstones with interbeds of siltstones and conglomerates, tuffs and andesites, conglomerates, medium-grained and fine-grained sandstones and siltstones in the upper part with a total thickness of about 1550-1800 m.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Disconformity onto the Gornaya Protoka Fm

Upper contact

Conformably overlain by the Silasu Fm

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[139.9,54.1],[138.3,52.9],[138.2,51.8],[135.6,50.2],[134.9,49.1],[134.5,48],[138,49.6],[138,50.7],[141.4,52.6],[141.3,53.3],[139.9,54.1]]]]}}

Fossils


Age 

"The unit contains Inoceramus ex gr. anglicus typical for the 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: 
1.0

    Ending date (Ma):  
100.50

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)