. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 1824 DIETZ AND OTHERS—CAYAR SUBMARINE CANYON BEACH STATION 1/2 SIN2«^ X COS* 2 KM SCALE BEACH WAVE FRONTS WAVE \ ORTHOGONAL SEAWARD LIMIT SURF ZONE LEGEND Figure 2. Environmental conditions and change in longshore-current transport near the head of the canyon. Diagrammatic reproduction of an aerial photograph taken over Cayar, Senegal, showing wave and beach conditions and the decrease in longshore transport rate. See text for explanation of s
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 1824 DIETZ AND OTHERS—CAYAR SUBMARINE CANYON BEACH STATION 1/2 SIN2«^ X COS* 2 KM SCALE BEACH WAVE FRONTS WAVE \ ORTHOGONAL SEAWARD LIMIT SURF ZONE LEGEND Figure 2. Environmental conditions and change in longshore-current transport near the head of the canyon. Diagrammatic reproduction of an aerial photograph taken over Cayar, Senegal, showing wave and beach conditions and the decrease in longshore transport rate. See text for explanation of symbols. suiting trough is more than 7 nautical miles (13 km) wide. Well-developed, leveed banks border the canyon in this area (Figs. 3, 4). DISCUSSION The development of a submarine canyon is generally attributed to one or more of the following processes: subaerial erosion, faulting, mass movement of sediments, or turbidity currents. For the Cayar Canyon, the absence of fluvial involvement during recent geologic time eliminates subaerial erosion as an origina- tive or developmental process. Furthermore, the apparent restriction of diastrophic activity to the Cape Verde peninsula and the lack of proximal tectonic lineaments suggest that crustal deformation per se did not create the canyon. It is not improbable, however, that the course of the canyon was initiated or modified by tectonism. But, as a developmental process, faulting appears to have played a secondary role. The most conspicuous geographic feature of the Cayar Canyon is that it occurs on the up- current side of a point of land. This position is not unique, for at least ten other submarine canyons are known to have this same relation with points (Shepard and Dill, 1966, p. 344-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanogra
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