Fossil soil remnants on the Condrusian peneplain and in its surroundings were described and, if possible, dated. These soils are mainly of Tertiary age. In this way a number of important remnants of fossil soils were classified: the flint eluvium, that was formed during the Paleocene and Eocene; the Neerrepen soil from the Lower Oligocene; the Boncelles 1 and 2 soils from the Upper Oligocene; the Boncelles 3 soil and the Andenne soil, that developed during the Lower and Middle Miocene; a Middle Miocene root horizon; the Onx soil that was formed during Upper Miocene-Pliocene and the Bolderberg and Heerlerheide soils from the Pliocene.The Andenne soil, a Miocene soil on Carboniferous limestone that formed the material called 'Andenne clay', was reconstructed. Leaching of silica in this soil appeared to have resulted in the chert caps that are still found on Carboniferous limestone.The stratigraphic value of a particular soil profile depends strongly on the region where it is found.Finally, some conclusions were made about the stratigraphic position of Tertiary sediments (Onx -gravels) and the time in which some features developed. The Onx deposits are placed in the Middle Miocene; formation of dolinas in Carboniferous rocks is thought to have begun during the Early Oligocene. Dissection of the Condrusian peneplain started as early as the Middle Miocene.