“…The TEX 86 ratio is a sea surface temperature (SST) proxy derived from the distribution of the isoprenoid glycerol dialkyl glycerol tetraether (iGDGT) membrane lipids of planktonic Thaumarchaeota (Schouten et al, ). TEX 86 records have been especially valuable in environments where other temperature proxies, such as the algal lipid‐based , are absent or outside the calibration range (e.g., Inglis et al, ), in the study of large lacustrine systems (e.g., Sinninghe Damsté et al, ), and in carbonate‐free marine sediments (e.g., Schouten et al, ). However, TEX 86 records sometimes disagree with other SST proxies such as (e.g., Becker et al, ; Menzel et al, ; Seki et al, ), and the empirical correlation between TEX 86 and SST varies regionally (Ho et al, ; Kim et al, ; Pearson & Ingalls, ; Tierney & Tingley, ; Trommer et al, ).…”