Fig. 2: Age–depth model for the Junín piston core.
The age–depth relationship is based on 80 radiocarbon dates1 (<17 metres composite depth (mcd)), 12 U-Th-dated intervals of authigenic calcite from five carbonate intervals between about 21 and 71 mcd (ref. 14) and 17 palaeomagnetic tie points15. The red line is the mean age model; purple and black dashes represent the 1 sigma and 2 sigma uncertainties around the mean, respectively. Four arrows mark the depth of four samples that yielded normal polarity (depths shown in the inset along the age of the Brunhes–Matuyama (B/M) reversal boundary) and are younger than 773 ka (ref. 16) (see Methods). Numbers 1–9 are tie points (Fig. 3b,c) used as the age model for Fig. 4a–c; tie points are for illustration only and were not used in the generation of this radiometric and palaeomagnetic age model15.
