This work investigates a number of gabbro - granite hybrid rocks exposed in the Great Escarpment between the coastal Namib desert and the inland plateau of Namibia. They form part of the tectonostratigraphic Konkiep Terrane which lies between the Mesoproterozoic Namaqua-Natal Province and largely Palaeoproterozoic Rehoboth Province in southern Africa. Microbeam U-Pb and Lu-Hf analyses of zircon were used to investigate the geochronology of these rocks which have previously been assigned to the Mooirivier Metamorphic Complex or the Kairab Formation. The oldest hybrid rocks at Neuhof Valley are U-Pb dated at 1359 ± 6 Ma and cut by 1347 ± 8 Ma unfoliated granite dykes, but have the youngest Lu-Hf crustal residence ages between 1690 and 1430 Ma. Together with nearby volcanic rocks of the 1333 ± 6 Ma Neuhof and 1327 ± 10 Ma Welverdiend Formations which we dated, they are thought to reflect rifting of the Rehoboth Province followed by the ocean development (by seafloor spreading) phase of the Namaqua Wilson Cycle. Keywords: Konkiep Terrane, Namaqua-Natal Province, Rehoboth Province, Zircon dating, U-Pb, Lu-Hf.