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Older and Younger Holsteinian climate oscillations in the palaeobotanical record of the Brus profile (SE Poland)

Hrynowiecka A., Pidek I. A.

Geological Quarterly

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2017

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Vol. 61, No. 4

723--737

EN

A pollen sequence of Holsteinian/Mazovian age known since the 1980s in Brus (Western Polesie) is the second site with a plant macrofossil record in eastern Poland. High sedimentation rates in a palaeolake that functioned in this area have allowed a detailed climate reconstruction that enabled to trace the Older and Younger Holsteinian oscillations and to outline the water-level changes in the water body. Climate reconstructions, based on full palaeobotanical analyses (pollen and macroremains), were compared with those from Nowiny Żukowskie (Lublin Upland), revealing regional climatic patterns. The two Holsteinian climate oscillations were correlated with those detected in the Dethlingen section of Germany (Koutsodendris et al., 2010), providing more information on the spatial scale of these events.

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Przyczyny i mechanizmy zmian klimatu w plejstocenie : state of art

Hrynowiecka A.

Przegląd Geologiczny

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2016

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Vol. 64, nr 1

26--34

EN

The reason of cyclic climate change during the Pleistocene is probably so-called Milankovitch cycles, consisting of three main orbital parameters of the Earth: the shape of Earth’s orbit eccentricity, axial tilt of Earth and precession – change in the direction of the Earth’s axis. They also impact on the insolation, which significantly contributes to the formation of ice sheets. The climate is conditioned largely by energy derived from the sun, dependent on the current solar activity. Specific configurations of these factors have contributed to the formation of glacial-interglacial cycles in the past; they have today and will have an impact on the climate of our planet in the future.

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Vegetation and stratigraphy of the Mazovian (Holsteinian) interglacial sections from Dobropol and other new sites in western Polesie Region, south-eastern Poland

Hrynowiecka A., Żarski M., Winter H.

Studia Quaternaria

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2014

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Vol. 31, Nr 1

17--30

EN

Geological mapping in eastern Poland resulted in new find of organic deposits near Włodawa. Pollen and plant macrofossils analyses at the Dobropol site proved deposition during the Mazovian (Holsteinian) Interglacial (MIS 11) Pollen spectra indicated strong predominance of Carpinus in the optimum phase (pollen period III), suggesting intensive influence of continental climate in this part of Poland. The paleolake Dobropol was shallow, with many species of rushes in a littoral zone. During the Liviecian (MIS 10) and the Krznanian (MIS 8) Glaciations the reservoir was occupied by an ice-dam lake, in which silt and clay deposition prevailed. The Mazovian Interglacial organic deposits were also recorded in immediate surroundings of the study area. Based on geological and paleobotanical examination of the Dobropol site, the ice sheet of the Krznanian Glaciation seemed to have reached at least the southern part of Włodawa. The ice sheet has not covered presumably the whole study area as its advance occurred in several lobes. The surroundings of Włodawa in the West Polesie Region are the third largest Mazovian paleo-lakeland area in Poland, apart from the vicinities of Biała Podlaska and the Łuków Plain.

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How to resolve Pleistocene stratigraphic problems by different methods? A case study from eastern Poland

Terpiłowski S., Zieliński T., Kusiak J., Pidek I.A., Czubla P., Hrynowiecka A., Godlewska A., Zieliński P., Małek M.

Geological Quarterly

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2014

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Vol. 58, No. 2

235--250

EN

Different methods have been used to determine the stratigraphic position of Pleistocene alluvial deposits, particularly fluvial interglacial deposits. Near-surface deposits of a meandering river, developed in point-bar and oxbow lake facies, in the Samica River valley (near Łuków, eastern Poland) have been investigated. The fossil valley is incised into the till plain and the outwash. The fluvial succession is locally overlain by solifluction deposits. All the deposits underwent sedimentological analysis. The petrographic composition of basal till occurring in the vicinity of a fossil valley was determined with the method of indicator erratics. Fluvial deposits were examined by pollen analysis and plant macrofossil analysis of oxbow lake facies. Absolute dating methods were applied to the deposits (thermoluminescence methods: TL and additionally IRSL). Lithological differences between fluvial and the surrounding glaciofluvial deposits were identified and their lithostratigraphic position assigned. Petrographic analysis of till and palaeobotanical analyses of oxbow lake facies gave compatible results. Fluvial deposits were formed after the Sanian 2/Elsterian Glaciation, during the Mazovian/Holsteinian Interglacial. Luminescence dating of the fluvial deposits by the TLMAX method yielded the most relevant results (412-445 ka), which indicate that these deposits were formed during the end of the MIS 12 and beginning of the MIS 11 stage.