GEOLOGOS 5, 2000
Chronostratigraphy of the vistulian deposits in the southern part of the Lower Vistula region (north Poland) in the light of TL dating
WOJCIECH WYSOTA1 , ALICJA CHRU¦CIŃSKA2 ,
KRZYSZTOF R. LANKAUF1 , KRZYSZTOF R. PRZEGIĘTKA2 , HUBERT L. OCZKOWSKI2 & JACEK SZMAŃDA1
1Institute of Geography, Toruń, Poland
2Institute of Physics, Toruń, Poland
Abstract: Lithostratigraphy and chronostratigraphy of the Vistulian deposits in the southern part of the Lower Vistula region are presented. In detail, sedimentological investigations and thermoluminescence (TL) dating of thick glaciogenic and fluvial deposits exposing at Rzeczkowo and Łaz˙yn sections in the southwest of the Chełmno Lakeland are described.
In profile of the Vistulian deposits have been distinguished two glaciogenic formation: Łazyn (La) and Starogród (Sa) which are represented mainly by tills and glaciolacustrine lithofacies. Fluvial deposits of Rzeczkowo formation (Rz) separate these formations. Four samples (R-2, L-1, L-2, L-3) taken from fluvial sand and silts of Rzeczkowo formation and two samples taken from glaciolacustrine silts (R-1) 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 Rzeczkowo formation has been related to the Gniew Interstadial (the Early Glacial). It is suggested that Rzeczkowo formation can be related with the younger Grudziadz Interstadial (the Interpleniglacial)
Key words: northern Poland, Vistulian Glaciation, thermoluminescence dating
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