The Umwindsi Shear (Figures 2 and 3) is a major dislocation cutting through the Harare Greenstone Belt and separating the north-trending Passaford Limb from the north-easterly trending Arcturus Limb in the southern part of the Belt. It dies out to the southwest but continues over 90 km to the northeast and north. It is bounded by two zones of intense deformation which are up to 7 km apart and these are more widely spaced where it passes through the Greenstone Belt.

A small outcrop on the bank of the Umwindsi River displays mylonitic felsic rocks with isoclinal folding, which is part of the intensely deformed margin of the Shear. Baldock (1991) does not ascribe any sense of movement to this deformation zone but evidence for this may be present on this outcrop.