An exploration borehole drilled in Aminuis (Hereroland East Area 2) yielded new data on the thickness of the Kalahari Group and the Karoo Sequence and on the distribution of the Nama Group below a cover of the abovementioned successions. Nama rocks in the lower portion of the borehole are considered to belong to the Kuibis Subgroup. It can be inferred that (i) the Nama rocks exposed south of Gobabis continue below a cover south-westwards into the Nama terrain in southern SWA/Namibia, and south-eastwards into Botswana; (ii) the Ghanzi ridge east of Gobabis existed in Karoo time already.