Abstract
The TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms) is a proxy for sea surface
temperature (SST) based on the distribution of isoprenoidal glycerol dialkyl glycerol tetraether (GDGT)
membrane lipids synthesized by marine pelagic Thaumarchaeota. One of the caveats of this proxy is
the production of additional GDGTs by sedimentary Euryarchaeota
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