Lithological and petrographic features of tills in the Koźmin region and their value for stratigraphical interpretation of glacial Lake Koźmin deposits, Central Poland

Abstract

Joanna Petera-Zganiacz Czubla P., Forysiak J., Petera-Zganiacz J. Lithological and petrographic features of tills in the Koźmin region and their value for stratigraphical interpretation of glacial Lake Koźmin deposits, Central Poland. Geologija. Vilnius. 2010. Vol. 52. No. 1–4(69–72). P. 1–8. ISSN 1392-110X In the middle section, the Warta River valley runs through the Adamow graben. Th e graben was characterized by subsidence since the end of the Paleogene and favoured accumulation during the Neogene and the Quaternary. Th e Quaternary deposits consist of several till horizons separated mainly by a series of fl uvioglacial sand and a thick series of glaciolacustrine sediments. Th e research was concentrated on three upper levels of tills and selected series of sand available in Koźmin and Koźmin-Polnoc “Adamow” opencast mines. Th e lithological, petrographical features and long-axis azimuth of pebbles were analyzed. Th e results showed that the lower till could be dated to the Elsterian, middle till to the Wartanian, and the upper till is probably also Wartanian. Glaciolacustrine deposits which fi lled the erosional form and appeared in the middle till correlate with the end of the Wartanian.