Fig. 2: Multiple hydrological proxies from the Bromfield Swamp.

a Organic content (OC); b three-point smoothed mean grain size (MGS); c Rb/Sr ratio; d Ti/Ca and Al/Ca ratios; e reconstructed Australian summer monsoon index (AuSMI) through the principal component analysis on the above five proxy records. The error bar shows standard deviation (SD) values among the data of the five proxies. The black crosses indicate AMS 14C dating points. The blue bar indicates the period of the Younger Dryas (YD) event, which is determined by referring to the nearby and well-dated Liang Luar Cave stalagmite record16.