Abstract
Flattenings that may be shelves formed by marine erosion/deposition or by slump masses are present on continental margins of southern Africa that border both the Atlantic and Indian oceans. Breaks in slope, indicated along sounding lines, suggest that a shallow terrace of the Atlantic margin has been warped downward from depths of about 130 m southward to about 200 m, and a deeper terrace lies between depths of about 150 m to about 440 m. Examination of contours and hypsometry (areas measured between depth contours) show widespread flattenings at about −65 and −95 m on the Indian Ocean margin and −125, −155, and −190 m along the Atlantic margin. Seismic profiles indicate that some of these and other more local flattenings are on slump blocks and thus are not correlatable for long distances. An additional complication is that sediment introduced by rivers is transported alongshore by wave-induced and oceanic bottom currents, and that their deltas are ephemeral.
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