Here we present measurements of DMP 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. The aromatic fractions, containing PAHs, were analysed using a Thermo Scientific Trace 1310 gas chromatograph coupled to a Thermo Fisher TSQ 8000 Evo single quadrupole mass spectrometer. Samples were injected on-column on a Phenomenex DB-5MS (25 m × 0.25 mm i.d., 0.25 µm film thickness). Helium was used as carrier gas. The oven program was as follows: 60 °C (held 3 min), ramped to 310 °C at 3 °C/min and then held isothermal for 20 min. The mass spectrometer was operated at an electron energy of 70 eV and scanning m/z 50-800 with a scan time of 1.0s. We present dimethylphenanthrenes (DMP) ratios to identify the source of biomass burning.