Studia Quaternaria, vol. 36, no. 2 (2019): 171–194 DOI: 10.24425/sq.2019.126388 ORIGIN AND EVOLUTION OF BASINS IN THE EASTERN PART OF JASŁO-SANOK DEPRESSION (POLISH CARPATHIANS) IN THE LATE VISTULIAN AND HOLOCENE Tadeusz Gerlach†1, Piotr Gębica2*, Kazimierz Szczepanek3, Dorota Nalepka4, Adam Walanus5 1 Department of Geomorphology and Hydrology of Mountains and Uplands, Polish Academy of Sciences, 31-018 Kraków, ul. Św. Jana 22, Poland 2 University of Rzeszów, Institute of Archaeology, 35-015 Rzeszów, Moniuszki 10, Poland; e-mail:
[email protected] 3 Institute of Botany, Jagiellonian University, 31-501 Kraków, Kopernika 27, Poland 4 W. Szafer Institute of Botany, Polish Academy of Sciences, 31-512 Kraków, Lubicz 46, Poland; e-mail:
[email protected] 5 Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, 30-059 Kraków, al. A. Mickiewicza 33, Poland; e-mail:
[email protected] * corresponding author Abstract: Results of a geomorphologic study as well as radiocarbon and pollen analyses of sediments in small basins of the Jasło-Sanok Depression (Western Carpathians) are summarised. Floors of these basins, carved in soft shale-sandstone Krosno Beds, are covered with channel fluvial deposits and oxbow-lake sediments with lake chalk and peat accumu- lated in the Late Vistulian and Holocene. Since the early Atlantic Phase (ca 8,400–7,900 BP) the apparent acceleration of overbank (flood) deposition intermitting the peat accumulation is observed. The plant succession includes the Late Glacial (pre-Allerød, Allerød and Younger Dryas) with coniferous park forests, through mixed deciduous forests of the Holocene with elm, hazel, oak and lime as well as spruce-elm forests with alder in wetlands, up to present-day hornbeam forests (Tilio-Carpinetum of various types) and extra-zonal Carpathian beech forests (Dentario-Glandulosae- Fagetum).