Primanka Fm
Period:
Cretaceous
Age Interval:
Early Cretaceous (S-7)
Province:
Siberia southeast
Type Locality and Naming
Koppi-Luzhki zone of Eastern Sikhote-Alin Basin
Lithology and Thickness
It is composed of siltstones, sandstones and clayey siliceous rocks with a total thickness of up to 1200 m.
Lithology Pattern:
Siltstone
Relationships and Distribution
Lower contact
Conformable onto the UstKolumbe Fm (Ust-Kolumbe Fm)
Upper contact
Conformably overlain by the Katalevsky Fm
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[140.4,51.1],[139.1,50.1],[139.2,49.8],[136.5,47.2],[136.6,46.8],[136.2,46.8],[134.8,45],[134,43.5],[135.5,44.5],[137.3,47],[140.3,48.8],[140.5,49.6],[140.4,51.1]]]]}}
Fossils
The formation yields inoceramid bivalves Inoceramus ex gr. paraketzovi, I. colonicus, I. cf. aucella and ammonites Barremites? sp. ind. and Crioceratites cf. emericii. The ammonites are typical for the Hauterivian-Barremian of the Tethys (Dimitrova, 1967; Obata et al., 1982; Company et al., 2003) and inoceramids are characteristic in the Hauterivian and Barremian (Anderson, 1938; Pergament, 1965; Pokhialainen, 1994).
Age
Thus, the Primanka Formation is considered as Hauterivian-Barremian.
Age Span:
Beginning stage:
Hauterivian
Fraction up in beginning stage:
0.8
Beginning date (Ma):
127.72
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)