Fig. 2: High-frequency δ¹⁸O variations in stalagmite K4.

Vertical shaded bars and numerals denote positive δ¹⁸O excursions identified in the KTC record. The broad excursion 9 is divided further into three substages. Each ²³⁰Th date utilized in the age model is labeled by a red dot (mean age) with 2-σ error bars.