Abstract
The distribution of glycerol dibiphytanyl glycerol tetraethers (GDGTs), predominantly derived from planktonic Crenarchaeota,
were studied in three age-equivalent Pliocene sapropels as well as in the homogeneous intervals, below and above the sapropel. In
both the homogeneous intervals and sapropels the dominance of GDGT-0 and crenarchaeol among the GDGTs indicated their
origin from planktonic
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