Abstract
A geodynamic study was made of the shield areas of Nigeria, with particular attention being paid to the origin and development of the Benue trough. First, the various open problems regarding its genesis put forward in the literature are reviewed. Then it is shown that the results of field studies, mainly of joint orientations, definitely favor the existence of a present-day sinistral shear in the Benue Trough (Pelusium megashear). However, the regional intraplate stress orientation is such that the Benue Trough must have originated at a much earlier time in a different stress system. In the neotectonic stress field the Benue Trough acts as a boundary condition by being a zone of weakness; this produces the observed features.
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