Overview of present geodynamic features of the southeast Atlantic and southwest Indian Ocean region. The positive Agulhas MAGSAT anomaly (short-dashed line) covers most of the region over the Agulhas and Mozambique plateaus (Antoine & Moyes 1992). The Bouvet hotspot track is shown according to the coordinate/time reconstructions (Ma) of Hartnady & le Roex (1985) (dotted line and black dots) and Martin (1987) (long-dashed line and white dots). The box indicates the area of the Agulhas Plateau shown in Fig. 2. Bathymetry is derived from the Smith & Sandwell (1997) 2′ × 2′ satellite data set.