Geological Survey of Finland, Special Paper 46 - arkisto.gsf.fi

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Geological Survey of Finland, Special Paper 46 Valentinas Baltrünas, K´stutis Švedas and Violeta Pukelyt Many publications have been dedicated to issues of the Late Pleistocene palaeogeography in Lithuania. Some of them are theoretical in nature and are confi ned to general and schematic palaeogeographical characteristics of the region. The publications served both as a theoretical and methodological basis for more recent investigations (Basalykas 1965, Dvareckas 1993). Some other studies were more specifi c with a special method used for analyzing diverse geologic and geomorphologic objects and with fundamental conclusions substantially contributing to the knowledge of the history of palaeogeographic conditions of the time (Basalykas et al. 1984, Dvareckas & Diceviπien 1987, Kabailien 1990, Kon- 40 INTRODUCTION dratien 1996, Komarovsky 1996, Satk0nas 1999, Gaigalas 2001, Švedas 2001, Švedas et al. 2004). Furthermore, it should be recognized that a composite evaluation and more accurate cartographic depiction of the palaeogeographical conditions were not fully realized, and the correlation of Pleistocene stratigraphical events in Lithuania was not associated with changes in the periglacial conditions. The purpose of this article is to summarise previous investigations on the geology and palaeogeography of the last glaciation and soil permafrost structures in periglacial areas in southern Lithuania to obtain a comprehensive model of the evolution of the area (Fig. 1). Fig. 1a) Location map of the studied area, b) Deglaciation of the Last (Weichselian, Nemunas) Glaciation in the South Lithuania (after Gaigalas (2001)): G – Gr0da (Brandenburg) stage, ˘ – ˘iogeliai (Frankfurt) phase, B (EL) – Baltija (Pomeranian) stage (East-Lithuanian phase), SL – South-Lithuanian phase, ML – Middle-Lithuanian phase, NL – North-Lithuanian phase; c) Geomorphological regions (compiled according to Atlas of Lithuania (Drobnys 1981): 1 – Middle Nemunas Plateau, 2 – South Lithuania Upland, 3 – Dainava Plain, 4 – Eišišks Plateau, 5 – Medininkai Upland.
Pleistocene deposits in southern Lithuania have been identifi ed and described using granulometric, mineralogical (in fractions 0.2–0.1 and 0.1–0.05 mm), petrographic (fractions 30–10, 10–5, and 5–2 mm), and geochemical (fraction
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Page 6 and 7: 4 CONTENTS Preface, Peter Johansson
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