Figure 2

Seasonal variations in the stable isotope and element/Ca composition of T-Tiwi1. Data is plotted as a function of distance from the shell edge. The direction of growth is indicated towards the right (arrow) and most recently secreted layers of carbonate are at 0 mm. Sampled element/Ca data is represented by thin grey lines, with the thicker black line representing the 5 point moving average. Dashed vertical lines define years and vertical red lines indicate upwelling events as deduced from the δ¹⁸O and δ¹³C data. Vertical grey bars mark the position of dark growth bands as visible along the sampling paths in reflected light (Supplementary Fig. S2a).