Here we present n-alkanes from the mid-Cretaceous layer in drill core 9R and 10R at MARUM-MeBo70 Site PS104_20-2 (73.57°S, 107.09°W; 946 m water depth) for reconstructing past wildfire activity and vegetation near the South Pole. The site is located within the Pine Island cross-shelf trough in the Amundsen Sea Embayment (ASE), West Antarctica and was drilled during RV Polarstern Expedition PS104 in 2017. Ratios of C23/C31 and C23/C15 n-alkanes have been proposed as biomarker proxies for fossil Sphagnum dominated peat bogs. n-Alkanes were analysed using an HP 6890 gas chromatograph equipped with a DB-5MS capillary column (30 m x 0.25 mm inner diameter, 0.25 μm film thickness) and a flame ionization detector with the oven temperature programmed as follows: 60 °C (held for 3 min), increase to 150 °C (20 °C/min) and then to 320 °C (6 °C/min; held for 40 min). The identification of n-alkanes was based on comparison of their retention times with those of reference compounds that were run on the same instrument.