Chronostratigraphy of the Vistulian deposits in the southern part of the Lower Vistula region (north Poland) in the light of TL dating

Lithostratigraphy and chronostratigraphy of the Vistulian deposits in the southern part of the Lower Vistula region are presented. In detail, sedimento- logical investigations and thermoluminescence (TL) dating of thick glaciogenic and fluvial deposits exposing at Rzęczkowo and Łążyn sections in the southwest of the Chełmno Lakeland are described. In profile of the Vistulian deposits have been distinguished two glaciogenic formation: Łążyn (La) and Starogród (Sa) which are represented mainly by tills and glaciolacustrine lithofacies. Fluvial deposits of Rzęczkowo formation (Rz) separate these formations. Four samples (R-2, L-l, L-2, L-3) taken from fluvial sand and silts of Rzęczkowo formation and two samples taken from glaciolacustrine silts (R-l) and stratified diamicton (L-4) of Starogród formation were investigated by thermoluminescence method. Obtained TL dates especially for the samples R-2 - 49 ± 6 ka and L-3 - 50 ± 8 ka indicate that chronostratigraphic position of distinguished formations can be younger than it was previously expected. So far Rzęczkowo formation has been related to the Gniew Interstadial (the Early Glacial). It is suggested that Rzęczkowo formation can be related with the younger Grudziądz Interstadial (the Inter-pleniglacial).

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Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).