Soils, fine-grained ice-rafted detritus (IRD), coals, and marine surface sediments in the Arctic realm (Svalbard) were collected in 2007 and 2008 to characterize organic matter (OM) sources in Arctic marine sediments. Bulk geochemical (C:N ratio and stable carbon isotopic composition) parameters suggest a predominant marine contribution to sedimentary OM. The branched and isoprenoid tetraether index (a proxy of soil OM input) indicates that soil OM contribution to the marine sediments is minor. However, the presence of retene (used as an indicator for coal-derived OM), the low carbon preference index and the average chain length of n-alkanes, and the depleted bulk radiocarbon content (D14C value) suggest that ancient OM of both coal-derived and mature IRD-derived OM is being buried in the Kongsfjord-Krossfjord system of Svalbard in the high Arctic. The relatively low retene concentrations in the marine surface sediments other than those in close vicinity of Ny Ålesund, previously a coal-mining town, ... : Supplement to: Kim, Jung-Hyun; Peterse, Francien; Willmott, Verónica; Klitgaard-Kristensen, Dorthe; Baas, Marianne; Schouten, Stefan; Sinninghe Damsté, Jaap S (2011): Large ancient organic matter contributions to Arctic marine sediments (Svalbard). Limnology and Oceanography, 56(4), 1463-1474 ...