Abstract
Branched glycerol dialkyl glycerol tetraether (GDGT) lipids occur in soils worldwide and are presumed to be produced by soil bacteria. They form the base of the MBT/CBT proxy (methylation of branched tetraethers/cyclisation of branched tetraethers) for palaeoclimate reconstruction. The degree of cyclisation and methylation, expressed in the CBT and MBT
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