Abstract The Moroccan Turbidite System is unique in that individual gravity-flow deposits can be correlated across distances of several hundred kilometers, both within and between depositional basins. An extensive dataset of shallow sediment cores is analyzed here, in order to investigate the influence of gradient changes on individual siliciclastic gravity flows passing through this system in the last 160,000 years. The largest flows (deposit volumes > 100 km 3 ) are capable of travelling for more than 1000 km across slopes of less than 0.1°. The deposits of these flows display significant lateral heterogeneity as a consequence of changes in seafloor gradient. Increases in gradient can lead to sediment bypass and/or erosion, and unconfined flows may become channelized. Decreases in gradient can lead to significant changes in sand–mud ratio and the deposition of thick mud caps, while small-volume flow deposits may pinch out completely. One of the largest flows shows evidence for multiple transformations as it crossed the Agadir Basin, with the resulting deposits switching laterally from (1) a gravel lag and cut-and-fill scours (representing bypass and erosion across a slope of 0.05°), to (2) a thick linked turbidite–debrite bed containing a muddy sand debrite (in response to a decrease in slope to < 0.01°), to (3) a normally graded turbidite (following a subtle increase in slope to 0.02°). Although the changes in slope angle described here appear remarkably subtle, the relative changes in slope are significant, and clearly exert a major control on flow behavior. Such variations in slope would not be detectable in outcrop or subsurface sequences, yet will generate significant complexity in deep-water reservoirs.

Abstract Two sediment wave fields on the submarine slopes of the Canary Islands display wave heights up to 70 m and wavelengths up to 2.4 km. Wave sediments consist of fine-grained turbidites and pelagic/hemipelagic sediments. The sediment waves are formed beneath unconfined turbidity currents, and are similar to sediment waves found on channel-levee back-slopes. Sediment wave morphology is resolvable on high-resolution seismic profiles. In areas lacking high-resolution seismic data, analysis of dipmeter readings may provide a useful tool for recognizing buried sequences of migrating waves. Thick sequences of sediment waves will impart a marked heterogeneity to a potential reservoir, leading to complications during reservoir production.