Area 2015D is underlain largely by rocks of Damaran age, most of which are covered by unconsolidated sands. Igneous rocks of Karoo and post-Karoo age intrude the Damaran rocks. The outcrop area of Damaran rocks can be divided into a southern and a northern domain. The southern one consists of high-grade schists and marbles of the Swakop Group intruded by four major types of Damaran granites. The northern domain is separated from the southern one by a major thrust fault, and the rock types found in this domain are low-grade schists, mixtites and marbles. Both domains were intruded by Karoo and post-Karoo granites, quartz-feldspar porphyries and dolerites. Only one phase of deformation, which gave rise to NNE-trending fold axes, has been recognised.