U-Pb single and multi-grain zircon ages have been obtained for volcanic and subvolcanic rocks from three isolated outcrops of the Nückopf Formation in the Rehoboth Basement Inlier of central Namibia. One concordant U-Pb age of 1226.4 ± 10.1 Ma from abraded zircons from the type locality (Farm Nauzerus 111) coincides with U-Pb zircon upper discordia intercepts of 1221 +36/ -29 Ma and 1222 ± 46 Ma from quartz-feldspar porphyries of Farms Alberta 176 and Jan Swart 326, respectively and is interpreted as the time of magmatic emplacement. In contrast, 207Pb/206Pb model ages from non-abraded and successively abraded zircons range unsystematically between 1219 and 1614 Ma. These surprisingly old ages are best explained by inherited Paleoproterozoic zircon xenocrysts from the assimilation of surrounding country rocks. In a regional context, the results of this study are compatible with those undertaken elsewhere along the western and northern margin of the Kalahari Craton.