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PALEOBIOGEOGRAPHIC ZONING OF THE NORTHERN HEMISPHERE SEAS AT THE END OF THE OXFORDIAN AND KIMMERIDGIAN BY FORAMINIFERA

B. L. Nikitenko 1,2, C. P. A-M. Colpaert 1

1 A. A. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS; 2 Novosibirsk State University, Novosibirsk, Russia

Biogeographic zoning of the Northern Hemisphere seas at the end of the Oxfordian and the Kimmeridgian of the Northern Hemisphere was carried out. This process enabled researchers to isolate a number of biogeographic units in the rank of regions and provinces by foraminifera. Ecotone districts between regions changed their location at different stages and could enter either the Arctic Region or the Boreal – Atlantic Biogeographic Region. Migration routes of foraminifera between various basins in the Northern Hemisphere were established. The widespread development of a number of common species and genera in associations of foraminifera of different biogeographic units was facilitated by the general Boreal transgression and temperature rise, which led to the establishment of good biogeographic links between the sub-Mediterranean, sub-Boreal, Boreal and Arctic Regions. These taxa of foraminifera are markers for isochronous interregional correlations of different climatic zones.

Keywords: paleobiogeography, Late Jurassic, Northern Hemisphere, Arctic Basins, foraminifera.

DOI 10.20403/2078-0575-2022-11с-36-42

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