Extended Data Fig. 7: Interhemispheric comparison of glaciogenic sedimentary sequences.

a, Channel River meltwater flood originating from the Baltic Ice Stream, European Ice Sheet (EIS)^12,129, and the associated (summary) EIS mass-balance changes (based on original interpretations from ref. ¹²). b, Terrigenous and ice-rafted debris (IRD) fluxes (mass accumulation rates, MAR) west of the Cordilleran Ice sheet (CIS)¹¹, and the associated (summary) CIS mass-balance changes (based on original interpretations from ref. ¹¹). c, Summary for glacier mass-balance changes (as in a, b; Extended Data Fig. 4 and Supplementary Fig. 3), and the global composite signal (NH-SH sum.; lower part) in which the blue/yellow intervals correspond to positive (glacier advance) / negative (retreat) mass balance, respectively. Coloured intervals (highlighted by horizontal black lines) correspond to period of similar signal (+/-) in glacier mass balance in all reconstructions (except at ca. 25-20 ka, where only three of the four regions have a similar signal; see the horizontal red lines). Triangles in a,b and c show the timing of local Last Glacial Maximum (LLGM)^37,130,131. d, Antarctica WDC δ¹⁸O (grey; thick line is 5-point moving average) and CO₂ (black) records^6,7. e, Greenland NGRIP δ¹⁸O (grey; thick line is 5-point moving average), aligned to WDC⁶. Coloured intervals as in c (that is, NH-SH sum.). Marine Isotope Stages (MIS), Antarctic Isotope Maxima (AIM) and Heinrich Stadials (HS) are numbered.