Выпуск: 1 , Том: 306 , Год издания: 2022

The marine clay deposits of the Tibeisale Formation cover large parts of the Yamal Peninsula in Western Siberia and overlie Cretaceous sandstones, clays and siltstones. Previous biostratigraphic studies have placed them in the lower Paleocene, but due to the lack of zonal index markers, their age has not been fully elucidated. We have analyzed the composition, structure and diversity of benthic foraminiferal assemblages from core material of the Kharasavey drill site on the Yamal Peninsula, with the aim to constrain the biostratigraphic age, to reconstruct the depositional environ-ment of the Tibeisale Formation, and to infer the response of benthic foraminifera to changes in the oxygen content of the surrounding waters. Based on biostratigraphic marker species, the composition of foraminiferal assemblages and lithological successions, we infer a Danian age for the time of deposition. The composition and numerical analyses of the foraminiferal faunas indicate deposition in well-oxygenated waters from deep to shallow shelf areas.