Environmental changes of the stadial/interstadial type during the Late Saalian (MIS-6) – Multi-proxy record at the Wola Starogrodzka site, central Poland

Abstract

Marine, lacustrine and terrestrial records from many sites located in various regions of the world suggest that the climate amelioration at the end of MIS-6 (Late Saalian) was interrupted by the short-termed cooling just prior to the MIS-6/MIS-5e boundary (Saalian/Eemian). This climatic event might be similar to the transition between interstadial conditions of the Allerød and stadial conditions of the Younger Dryas at the end of the Last Glacial (MIS-2). On the other hand, the results of quite numerous palaeobotanical studies show no stadial-interstadial oscillations below the Saalian/Eemian boundary, but reflect the gradual improvement of climate and increasing density of vegetation at that time. In western and central Europe, environment changes at the end of the Late Saalian are poorly recognized. Therefore, each new record illustrating this part of the Late Pleistocene is extremely important. We examined two profiles at the Wola Starogrodzka site, central Poland, by high-resolution analyses of pollen, Cladocera, plant macroscopic remains, mineral grain size and distribution, and organic matter content. The studied sequences represent the closing phase of the Late Saalian (in Poland called the Warta Stage of Odranian), and the early to middle part of the Eemian Interglacial. Change of the stadial-interstadial-stadial type at the end of the Late Saalian was registered both in aquatic and terrestrial environment. The recorded interstadial was correlated with Zeifen interstadial, while the following stadial – with the Kattegat stadial. Quantitative palaeoclimate reconstruction based on pollen data (modern analogue technique) showed the change in mean annual temperature by ca. 3 °C at that time.