his dataset includes both bulk sediment organic data and biomarker data: total organic carbon (TOC), total nitrogen (TN), total hydrogen (TH), atomic hydrogen - carbon ratio (H/C), atomic carbon - nitrogen ratio (C/N), carbon isotopic composition (13C), and nitrogen isotopic composition (15N) (measured by means of isotope-ratio mass spectrometry with a coupled elemental analyser, IRMS-EA), as well as n-alkane concentrations (from C18 to C37), including the total n-alkane concentration, the average change length (ACL), the portion aquatic (Paq), and the carbon preference index (CPI) (measured using gas chromatography with flame-ionization detection - GC-FID).