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On the West Africa continental rise, between 5 and 13°S lat., diapiric structures have been recorded which terminate in a scarp at the base of the rise. This distribution is comparable with the Sigsbee rise and scarp in the Gulf of Mexico. The northern limit of the diapirs, which are assumed to be salt, is not known, but the southern limit appears to be the bulge of Angola at approximately 13°S. Fourteen short reflection traverses of the margin and 26 sonobuoy refraction profiles were recorded in the region. Seismic refraction velocities averaging 4.3 km/sec at depths of 4.5 km on the rise are assigned to salt of Early Cretaceous Aptian age. Other velocity-age correlations are attempted near the Cuanza basin. Combined geophysical evidence indicates that a slight excess of non-magnetic material, consisting in part of evaporitic sediments, is present on the West African margin.
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