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
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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)