Figure 2
From left to right: (a) North stratigraphic section at T16 Pit 4, showing the three main stratigraphic units and solifluction lobes 3b-e (3a was restricted to the westernmost part of the section and was not sampled); (b) Standard deviation of the fine (<2 mm) fraction by laser particle size analysis (top axis); (c) Organic matter content relative to mineral matter by loss-on-ignition (%, bottom axis); (d) Gravel content (wt%, top axis); (e) Calcium carbonate content relative to mineral matter by loss-on-ignition (%, hollow dots, top axis) within the sediments at pit 4. Well-sorted primary loess has a low standard deviation; redeposition and soil development affect this (see SI Section 2); the distance between (b,c) (gray area) is therefore a rough proxy for climate, with climatic amelioration indicated where the distance is greater. Gravel is present in the sampled sediments through gravitational input; the proportion of gravel increases during prolonged surface exposure or slow sediment accumulation. Carbonate content increases when evaporation is high relative to precipitation. Archaeological horizons (AH), modelled age of the boundaries between events (SI Section 4), and climatic interpretation using NGRIP as a comparison are also indicated.
