Pseudolamarckina pseudorjasanensis Dain, 1967 (Foraminifera) as a Kimmeridgian marker species and its significance for biostratigraphy, palaeoecology and palaeobiogeography

This study presents a taxonomical review of the speciesPseudolamarckina pseudorjasanensisDain, 1967 collected at different sampling levels from the central and northern parts of European Russia and from Western Siberia. Morphological and biometrical analyses show thatP. pseudorjasanensisis character...

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Bibliographic Details
Published in:Polar Research
Main Authors: Colpaert, Clémentine Peggy Anne-Marie, Leonidovich Nikitenko, Boris
Format: Article in Journal/Newspaper
Language:English
Published: Norwegian Polar Institute 2019
Subjects:
Foraminifera
systematics
Arctic
Jurassic
biogeography
palaeoenvironments
Foraminifera*
Polar Research
Siberia
Online Access:https://polarresearch.net/index.php/polar/article/view/3461
https://doi.org/10.33265/polar.v38.3461
Description
Summary:This study presents a taxonomical review of the speciesPseudolamarckina pseudorjasanensisDain, 1967 collected at different sampling levels from the central and northern parts of European Russia and from Western Siberia. Morphological and biometrical analyses show thatP. pseudorjasanensisis characterized by wide intraspecific variabilities and may encompass various previously described Kimmeridgian species of the genusPseudolamarckina. The first appearance ofP. pseudorjasanensisis recorded from the latest Early Kimmeridgian of sub-Mediterranean to Arctic regions. Furthermore,P. pseudorjasanensisappears to be the marker species of the foraminiferal JF41 Zone in Kimmeridgian sections of sub-boreal, boreal and Arctic regions. This JF41 Zone is particularly significant for interregional correlations. Finally,P. pseudorjasanensiswas widespread across the Kimmeridgian basins of the Northern Hemisphere and was associated with environments predominantly located in the middle sublittoral zone.

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