Text S3
Stalagmite CRY-S1 was collected from Crystal Cave in southwest Australia
in 2008. A thick section was prepared by cutting along the growth axis
and mounting the sub-sample in resin, which was then polished to 1 μm.
The top ~15 mm of the sample is presented here.
S-μXFM analyses were conducted at the Australian Synchrotron under
experiment 13457, following methods described in (Borsato et al., 2021;
McDonough et al., 2022). The Maia 384-element planar detector was used,
and resulting spectra were analysed using ImageJ. Sr S-μXFM maps were
used to construct a lamina-count chronology following (Faraji et al.,
2021), with laminae counted in ImageJ.