Выпуск: 9 , Том: 66 , Год издания: 2025

Results of an analysis of the geographical distribution and taxonomic diversity of dinoflagellate cysts in the Campanian age of the Northern Hemisphere are presented. Three types of dinocyst assemblages are established on the basis of the qualitative and quantitative assessment of their generic composition. Some stratigraphically important genera and species, previously having narrower habitats, have been widely distributed due to transgressive events, expansion of interbasin connections, and the presence of multidirectional meridional currents. This study reveals the possibility of comparing the North Siberian dinocyst assemblages with those from the stratotypes containing the orthostratigraphic faunal groups of the West European and North American Campanian deposits through the ecotone sections of the Subpolar Cis-Urals and the south of Western Siberia.