Abstract: This Diploma thesis includes collection, analysis and interpretation of structural data about faults and shear joints observed in carbonate breccias of Lower Cretaceous, Palaeogene and Neogene age exposed on the southeastern part of the Velebit Mt. in the External Dinarides. Collected data were analyzed by Win-Tensor (ver. 4.04.) software in order to separate kinematically compatible fault groups formed during particular palaeostress regimes. Four groups of faults have been separated. Group 1 comprises the youngest interpreted faults and shear joints presumed as formed during the Pliocene and Quaternary, in transpressional palaeostress regime, characterized by NW−SE and NE−SW trending compressional and tensional axis, respectively. Group 2 is composed of WNW−ESE striking normal faults, formed in extensional palaeostress regime with NNE−SSW trending tensional axis, i.e. almost perpendicular to predominant strike of the major compressional structures in study area of the SE part of the Velebit Mt. Formation of faults of this group is assumed during the Oligocene and possibly Miocene. Group 3 consists of normal−dextral and normal−sinistral faults that indicate extensional palaeostress regime characterised by ENE−WSW trending tensional axis. Group 4 comprises ENE−WSW striking reverse faults, formed in compressional palaeostress regime with NNW−SSE trending compressional axis. Formation of this fault group is presumed during mid−to−late Eocene and Oligocene. Further more, data previously collected in Tertiary carbonate breccias (Jelar-deposits, or Velebit breccias) in the central part of the Velebit Mt. have been analyzed as well, using the same methodology and software, in order to make a correlation between recorded data from the two areas. As a result, four groups of faults have been separated which were, together with the groups recorded by this thesis, interpreted within different stages of the tectonic evolution of the Velebit Mt. proposed so far.