This excursion guide describes and proposes an interpretation of hitherto little or unknown sedimentary and volcanic rocks of probably Early Cretaceous age, which overlie Mesoproterozoic granites on the Gamsberg Plateau, together with their major element composition and a preliminary radiometric age. Much of this erstwhile thick package of supracrustal rocks, for which the name Gamsberg Plateau Formation is suggested, has subsequently been eroded, and only isolated remnants and scree cover are available for study today. Furthermore, clays of probably Neogene to Quaternary age, which in turn overlie the quartzites and rhyolites, their mineralogy and pollen content are described. Keywords: Gamsberg, quartzite, rhyolite, earthquake fissures, clay, neogene, early cretaceous.