Fig. 6.

The timings of climatic and environmental changes for the past 18,000 to 12,000 years on the IntCal20 timeline, with Greenland event stratigraphy shown. Calibration and timescale alignments were conducted as detailed for Fig. 2. a) NGRIP δ¹⁸O record (Andersen et al. 2006; Svensson et al. 2006). The shaded colour represents age uncertainty at 2 sigma (roughly equated to the maximum counting errors). b and c) The sulphur (δ³⁴S) and nitrogen (δ¹⁵N) isotope results from the dated specimens of Kulnå Cave from this study with age uncertainty of 2 sigma. d) Švarcenberk Lake, Bohemia (Pokorny, 2002; Hošek et al. 2014) and e) Vracov, Moravia (Kuneš et al. 2015; Kuneš and Abraham 2017) pollen records plotted on the age models created in this study, presented in Supplementary Information 7. The shaded colour represents the 2 sigma age uncertainty of the age model. f) Schematic representation of the switch of braided to meandering rivers described Kadlec et al. (2015). g) Schematic representation of vegetation development (plant symbols), landscape erosion (blue arrows), pedogensis (brown gradient), and permafrost depth (dash blackline) evident in palaeoenvironmental archives from the Czech Republic (Svobodová 1988; Svoboda 1994; Ložek and Cilek 1995; Pokorny 2002; Engel et al. 2010; Petr and Novák 2014; Hošek et al. 2014, 2017; Kuneš et al. 2015; Szabó et al. 2017; Kuneš and Abraham 2017)