The Okahandja Lineament, a fundamental tectonic boundary in the Damara Orogen of South West Africa/Namibia. Keywords: Acid volcanic rocks, Aeromagnetically, Amphibolite, Biotite lamination, Dolomite, Lithology, Mixtite, Nosib Group, Pegmatites, Phyllite, Quartzite, Schistosities, Strike-parallel post-Karoo faulting.