(Table S1 c) Definition of planktic 14C plateaus for sediment core KNR159-5-36GGC

Plateau No. YD - 5a: Two suites of 14C outliers with approximately uniform 14C age each are ascribed to two events of Zoophycos burrowing (Fig.2). Below Plateau 5a a 14C jump of ~1200 yr reflects a hiatus at 182.5-185.5 cm depth.YD-5a号平台（Plateau No. YD - 5a）：存在两组碳十四（14C）异常值，每组均具有近似均一的碳十四年龄，这两组异常值被归因于两期动藻迹（Zoophycos）潜穴活动（图2）。在YD-5a号平台下方，约1200年的碳十四年龄跳变反映了深度182.5~185.5厘米处的沉积间断。