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Figure 7. Whole-oil gas chromatogram and terpane bio-marker (m/z 191) scan of a sea-bottom sediment extract from offshore Florida containing the signature of carbonate-sourced oil (peaks highlighted in green) overprinted with recent organic matter (peaks highlighted in blue). Interpretations of source family and hydrocarbon maturity for the petroleum can be made in “windows” in which the interference by recent organic matter is limited.