(Table S2) U, Th, 230Th, and 231Pa concentrations and U isotopic composition ...

The age of the samples is derived from d18O stratigraphy augmented with six AMS radiocarbon dates (McCave et al., 2005).样本的年龄源自δ¹⁸O地层学（d18O stratigraphy），并辅以6次加速器质谱（AMS）放射性碳定年结果（McCave等，2005）。