Abstract: The aim of this Thesis is to investigate mineralogical, geochemical, pedophysical and micromorphological properties of the soil that is developed on glacial loess on the Savudrija peninsula. During the field investigation, the morphological properties of each horizon were described in detail and samples were taken along the pedosediment complex. This Thesis is focused on the lowermost part of the profile which includes four samples of loess and red paleosol. Laboratory work consisted of a detailed chemical analysis, analysis of iron and manganese oxides and hydroxides soluble in oxalate and dithionite, physical and chemical analysis of the paleosols, particle size analysis, mineral composition analysis using the X-ray diffraction method, optical and infrared stimulated luminescence and lastly, a micromorphological analysis of thin sections. The most important conclusions of this Thesis are as follows: (1) The investigation showed that the red paleosol formed by the process of rubification from a dominant loess parent material. Prior to this, there was an older paleosol situated on the surface of the Cretaceous limestone, but it was eroded. This is proved by the presence of pedorelicts found in the red paleosol which represent fragments of this older paleosol. The processes of decalcification and bisialitization were important during the formation of the paleosol. The following horizon stratification was formed: Ck2 (4910) – BC (4906) – Bg2 (4907) – Bg (4908) – R (WRB, 2006). (2) The age of the pedosediment complex correlates with the OIS-4 stage. The lowermost sample SAV 1 corresponds to the 4907 (Bg2) sample and probably has an underestimated age due to pedogenic processes. (3) ) The clay fraction of all analysed samples contains illitic material, good and poorly crystallized kaolinite, goethite, 14 Ǻ minerals and mixed layer clay minerals. Mineral composition, content of dithionite soluble iron and the lack of clay coatings clearly indicate that the red paleosol situated at the bottom of Savudrija pedosedimentary complex is different from the majority of terra rossa soils in Istria.