First Data on the Paleogeographical Settings and Chronology of the Last Interglacial on the Zimnii Coast of the White Sea

Zaretskaya, N. E.; Taldenkova, E. E.; Ovsepyan, Ya. S.; Ruchkin, M. V.; Baranov, D. V.; Rudenko, O. V.; Stepanova, A. Yu.

doi:10.1134/s1028334x23601360

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“…This primarily concerns the last interglacial of marine isotope stage (MIS) 5e and the preceding glacial termination II at the end of MIS 6, which coincide in time with the end of the Saalian glaciation, the Eemian interglacial of Western Europe, the end of the Moscovian glaciation, and the beginning of the Mikulinian interglacial in European Russia, from approximately 130-131 to 115-116 thousand years ago (ka) [1,2]. This warming phase is partially overlapping with the Boreal (Eemian) transgression, well known for its stratigraphic reference sediment sequence in the European north of Russia, northern Europe, and Scandinavia [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

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confidence: 99%

Boreal (Eemian) Transgression in the Northeastern White Sea Region: Multiproxy Evidence from Bychye-2 Section

Taldenkova,

Ovsepyan,

Rudenko

et al. 2024

Quaternary

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Reconstructing interglacial marine environments helps us understand the climate change mechanisms of the past. To contribute to this body of knowledge, we studied a high-resolution 455 cm-thick sediment sequence of the Boreal (Eemian) marine beds directly overlying Moscovian (Saalian) moraine in the Bychye-2 section on the Pyoza River. We analyzed lithological and microfossil (foraminifers, ostracods, pollen, aquatic palynomorphs) variations at the studied site. Stratigraphical zonation is based on the local and well-established regional pollen zones, correlated with the western European pollen zones. The studied marine beds accumulated from the end of the Moscovian glacial (>131 ka) until ca. 119.5 ka. We distinguished three successive phases: a seasonally sea-ice-covered, relatively deep, freshened basin in the initial rapid flooding stage (>131–130.5 ka); a deep basin in the maximum flooding phase with less extensive sea ice cover (130.5–130.25 ka); and a shallow basin with reduced sea ice cover (130.25–119.5 ka). According to a pollen zone comparison with other sites, the regional glacioisostatic rebound started ca. 130 ka. The diverse warm-water assemblages of benthic foraminifers and ostracods containing typical Baltic Sea species occurred during the regression, mainly 128–124 ka, thus giving evidence for a relatively long-lasting connection between the White and Baltic Seas.

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