Extended Data Fig. 3: Age model for U1361A.
From: Ice loss from the East Antarctic Ice Sheet during late Pleistocene interglacials
a, LR04 benthic oxygen isotope (δ18O) stack72, labelled with interglacial MIS numbers. b, Age–depth constraints for U1361A cores 1H and 2H, plotted alongside lithology. Vertical bars for each datum indicate upper and lower depth constraints in U1361A (Supplementary Table 8). Black dashed line is a linear model fit through the Holocene radiocarbon age, H. karstenii last common occurrence (LCO), A. ingens last occurrence (LO) (upper and lower depths), and the base of chron C1n (*upper depth only, based on the splice to U1361B) (Supplementary Table 8). Forced to an intercept of 0 ka at 0 mbsf, this trendline produces the age–depth equation y = 64.314x, where y is age (ka; kyr ago) and x is depth (mbsf). This equation was used to calculate ages for Fig. 3d, e. Grey dotted lines tie lithological transitions to MIS boundaries, based on our age–depth constraints. Note that the Pleistocene section of the core below MIS 12 is affected by sediment disturbance, with extreme disturbance from 9.0–11.67 mbsf (soupy) and 11.67–14.26 mbsf (flow) represented schematically with a zigzag line. We have therefore restricted our provenance study to the upper ~7.5 mbsf.
