Correlation of Sr/Ca anomalies with linear global HadSST4 array where: Sr/Ca = -10.391 (HadSST4) with R 2 = 0.91, LINEST F statistic = 780 and dashed lines showing 1 s.d. of average residuals (0.07 C). Dotted horizontal and vertical lines are 1961-1990 anomaly means about which the regressions pivot.