Figure 4

Partial gas chromatogram of fat residues extracted from Kjelmøy potsherds. (a) Sherd SÄR10B from a coastal site and (b) SÄR14 from interior Norway. Grey circles indicate alkanes, squares indicate α,ω-dicarboxylic acids, and Br indicates branched chain fatty acid. (c) A partial selected ion monitoring (SIM) chromatogram of SÄR10B shows the base peak m/z 105 of the APAAs and the distribution of APAAs with chain lengths C₁₆–C₂₂, and (d) the partial SIM chromatogram of SÄR10B shows the distribution of DHYAs. C₁₈, C₂₀, and C₂₂ indicate the chain lengths of the DHYAs. The findings of APAAs and DHYAs strongly indicate the processing of marine commodities in vessel SÄR10B.