Fig. 3: \(^{233}\)U/\(^{236}\)U ratio in coral samples.

\(^{233}\)U/\(^{236}\)U (black squares) calculated from the measurement results for the Kume coral core with ±1 \(\sigma\) uncertainty. The solid blue lines indicate the weighted average for the respective time period (I–III) and the dashed lines the corresponding 1 \(\sigma\) uncertainty (s.e.m.).