The structures formed during the accretion stage are typical of major ductile shear zones in the mid-crust that are formed during continent-continent collisions. After a pause of 150 Ma all of the terranes were comprehensively folded and sheared during the post-accretion stage (the D4-D6 deformation events). The D4 event produced macroscopic upright to inclined asymmetric Z-folds with fold hinges sub-parallel to the SW-directed tectonic transport direction (in terms of contemporary Gondwana coordinates). This post-accretion stage involved continued but oblique NW-directed movement of the Kalahari Craton, coupled with N-S compression.
Attributes of the F4 structures are interpreted in terms of five models: the thrust-ramp-, constrictive-, strike-slip-, transtensional- and differential (wrench-shear) transport models. It is concluded that the last-mentioned is the only model that explains all of the observed characteristics. Sub-horizontal wrench-shear that caused reorientation of the incremental strain ellipsoid is superimposed on all earlier structures, resulting in the production of oblique folds in the thrusted terranes. This wrench-shear model explains the end-phase of a protracted orogenic cycle involving an indentational continent collision at 1.030 Ga, possibly between the Kalahari and Laurentia Cratons. The deformation affected the entire crust and even the upper part of the underlying mantle.