The geological structure of the Kukulbei Ridge and its environs includes metamorphic rocks of the Paleozoic, sandstone-conglomerate-shale deposits of the marine Jurassic (J1–J2), ancient cataclased coarse-grained granites and rocks of the Middle Cimmerian intrusive complex, represented by quartz diorites, granodiorites and granites. Young igneous rocks originated from a single magmatic reservoir. Between granodiorite and leucocratic granite there are numerous transitional rocks, linking them into a single complex of a sequentially developing intrusive process.