Abstract
A geological and physiographical interpretation of nearly 60,000 km 2 of the continental margin of SE Africa (21°20′E to 31°E) has been made using GLORIA sonographs and seismic and bathymetric records. These data have enhanced our understanding of the structural complexity of basement and sedimentary features, in particular the marginal fracture ridge (MFR), which forms part of the Agulhas-Falkland Fracture Zone (AFFZ). Most of the 500 km long exposed section can be traced in the sonographs, and it is concluded that the MFR is not a single lineament, but consists of two en-echelon basement ridges that overlap by approximately 20 km in the vicinity of the Scrutton Ridge (23.5°E). The latter is an enigmatic basement sliver that may be a narrow upthrust block. East of 26°E a major slump and canyon province has been identified in the southwestern part of the Natal Valley. Here we record three previously undescribed canyons, (Padrone, Boesmans and Fish), and extensive compressional structures in the distal parts of a large slump lobe.
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