The Upper Proterozoic Damara Sequence is well exposed in Kaokoland in the remote northwestern area of Namibia. Geological mapping is only available on a small scale (unpublished 1 :250 000 provisional geological compilations for Open File of the Geological Survey of Namibia:- 1712 Swartbooisdrif (1968); 1812 Ohopoho (1968), 1912 Sesfontein (1968), 1:1 000 000 scale Geological Map of South West Africa/Namibia (1965, 1980); 1:100 000 scale, Guj (1970); Hedberg (1979); 1 :500000 scale, Miller and Grote (1988)). Kaokoland has recently become the focus of mineral exploration activities, and Tsongoari Exploration (Pty) Ltd have mapped in detail the area around the Tsongoari Pb-Zn-Cu occurrence (E & MJ, December 1990). The deposit is hosted by rocks of the Ugab Subgroup of the Damara Sequence. The U gab Subgroup comprises a wide variety of rock types, and SACS (1980) proposed the formal term Mudorib Formation (after the Mudorib River 45 km southwest of Sesfontein) to encompass these. We believe, however, that the Mudorib Formation is not useful for detailed mapping because it is too broadly defined. Tsongoari Exploration (Pty) Ltd have divided the Ugab Subgroup into distinct mappable units which are bounded by unconformities or para-conformities.