LITOLOGIA I SYTUACJA GEOLOGICZNA OSADÓW INTERGLACJAŁU AUGUSTOWSKIEGO Z PROFILI SUCHA WIEŚ (POJEZIERZE EŁCKIE) I CZARNUCHA (RÓWNINA AUGUSTOWSKA)

Abstract

LITHOLOGY AND GEOLOGICAL POSITION OF THE AUGUSTOVIAN INTERGLACIAL DEPOSITS FROM SUCHA WIEŚ (EŁK LAKELAND) AND CZARNUCHA (AUGUSTÓW PLAIN)Abstract. In the Sucha Wieś and Czarnucha boreholes drilled in 1988–1989, interglacial lacustrine and fluvial organic and mineral deposits (Sucha Wieś – 31.1 m; Czarnucha – 32.1 m in thickness) were encountered in the basal portion of the thick Pleistocene series (Sucha Wieś – 185 m; Czarnucha – 142 m) of various ages and origin. Palynological analyses and palaeomagnetic datings indicate that these deposits are of Augustovian Interglacial age. The present report shows the location and detailed lithological and petrographical description of these sections. Lithological and sedimentological characteristics of interglacial lacustrine and fluvial deposits are given separately. Seven different lithological sequences have been identified within the sequence of interglacial lacustrine and fluvial deposits of the Sucha Wieś section. In the Czarnucha section – 5 such sequences have been found. The lithology of the Sucha Wieś section confirmed that sedimentary conditions were invariable during the whole period. Additionally, the sediments show no glaciotectonic deformation. However, the Czarnucha deposits were glaciotectonically disturbed by each successive ice sheet. The final chapter provides an overview of the geological position and stratigraphy of the Pleistocene deposits from the Sucha Wieś and Czarnucha sections with reference to other sections from the Augustów Plain and southeastern part of the Ełk Lakeland.