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In general the Exemestane wave crests are straight to undulose and show little to no bifurcation along strike (Fig. 3). The sediment waves closest to the shelf edge are less continuous than the other sets. They are best developed within gully axes and are sometimes absent in inter-gully areas (Fig. 3).
4.1.3. Relationship between sediment waves and gullies
An unusual feature of the sediment waves on this part of the Gabon continental slope is their relationship with the gullies. The gullies clearly incise into the sediments containing the sediment waves, suggesting that they post-date the sediment waves. However the presence of sediment waves crossing and occupying the gullies suggests that the sediment waves have continued to form and grow after the gullies have formed. Within the gullies the sediment waves often exhibit more irregular geometries with deeper troughs that locally form sub-circular depressions (Fig. 7(a), (c)). This may suggest that the dynamics of the currents forming the sediment waves is altered in some way by the local change in slope topography in the vicinity of the gullies.