This data set (updated 2025) contains: A) Data 1) Summary files of the central data sets as Microsoft Excel worksheets Multi-frequency DynoMag data for section Khonako-II (KH-II_chiBFD.xlsx) Dual-frequency Kappabridge data for section Khonako-II (KH-II_full_profile_Kappa.xlsx) 2) Temperature-dependent magnetic susceptibility data in folder k(T).zip 3) Remanence measurement data in folder remanence.zip 4) Temperature-dependent magnetic susceptibility data measured at three frequencies using a Quantum Design Magnetic Properties Measurement System (SQUID.zip) 5) Multi-frequncy magnetic susceptibilty data for different sites (MFMS_data.zip) 6) Raw data files of dual-frequency DynoMag data for section Khonako-II (KH-II_section.zip) B) R code files 1) R code to correct hysteresis loops from MPMS data for paramagentic contributions and to extract values of coercivity and exchange bias (magnetic_hysteresis_suppl_mat.R). The data files used in this code are stored in folder mass-corrected_MPMS.zip. 2) R code to calculate magnetic particle size distributions from multi-frequency magnetic susceptibility data measured on the Dynomag instument and temperature-dependent magnetic susceptibility data measured at three frequencies using a Quantum Design Magnetic Properties Measurement System (particle_size_calculation.R). The data files used in this code are stored in folder particle_size_distribution.zip.