This work is a continuation of the geological studies and presents the results of the petrographic, Xray, diatom, and spore-pollen analyses of the rocks aimed at reconstructing the geological evolution of the sub� marine Vityaz Ridge area. Abstract—This paper describes the volcanosedimentary complexes of different ages (Late Cretaceous-Early Paleocene, Paleocene-Eocene (?), Oligocene-Early Miocene, and Pliocene-Pleistocene) that compose the basement and sedimentary cover of the submarine Vityaz Ridge. It was found that the Upper Cretaceous sedimentary rocks from the basement of the Vityaz Ridge (felsic) and the Lesser Kuril Ridge (mafic) have dif� ferent compositions. Matrix mineral assemblages corresponding to the smectite and corrensite stages of epi� genesis of Cenozoic rocks were distinguished, and a scheme of the Late Cretaceous-Pleistocene geological evolution of the region was proposed.