Fig. S1. Map of the Mediterranean Sea showing the location of core MS66PC.

Fig. S2. Agarose gel with total DNA extracts from selected intervals spanning sapropels S1, S3, S4, and S5 as well as oxidized Corg-poor intercalating sediments (i.s.).

Table S1. PCR assay specifications, including name and sequence of used primers, E. coli position of the primers, the amplicon size, annealing temperatures (Ta) used in the analyses, target phylogenetic group and references where the primers were first described.

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