Roter Kamm is a relatively young 2.5-km-diameter impact crater located in the southern Namib desert. The rocks of the crater rim are fractured and cut by numerous fine-grained, clast-rich veins and dykes that closely resemble pseudotachylytes in the field. Most veins closely match their host rocks in bulk composition and have formed by localized cataclasis of the host rock followed in many cases by partial re-crystallization that has partly obliterated the cataclastic texture in the finest grain size fraction. This thermal annealing is most prominent in the very narrow veinlets, in the margins of the larger veins, and in the...