“…The use of (Mg/Ca) calcite ratios as a palaeothermometer has since become widespread in marine settings with many studies on benthic and planktonic foraminifera (Delaney et al, 1985;Nurnberg et al, 1996;Rosenthal et al, 1997;Anand et al, 2003;Elderfield et al, 2006;Kısakü rek et al, 2008;Boussetta et al, 2011;Martínez-Botí et al, 2011) and to a lesser extent in corals (Mitsuguchi et al, 1996;Wei et al, 2000;Shirai et al, 2005;Yu et al, 2006;Reynaud et al, 2007). Surface freshwater carbonates ("tufa") are ambient temperature freshwater deposits which have been considered, but not thoroughly investigated, as potential archives of terrestrial palaeotemperature data through their Mg/Ca ratios (Garnett et al, 2004;Rogerson et al, 2008;Lojen et al, 2009;Brasier et al, 2010).…”