. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 2] SUBMARINE CANYONS 489 America. The studies of Boiircart (1959) and of his associates have resulted in many interesting contour charts of these canyons (Figs. 8 and 9). Even before these canyons were surveyed by the French geologists, Kuenen (1953) had come to the conclusion that at least the Corsican and Riviera submarine canyons were the submerged continuations of river-eroded canyons. The newer surveys apparently confirm this opinion, at least so far as the shapes of the canyons are concerned. As off Cape San Lu
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 2] SUBMARINE CANYONS 489 America. The studies of Boiircart (1959) and of his associates have resulted in many interesting contour charts of these canyons (Figs. 8 and 9). Even before these canyons were surveyed by the French geologists, Kuenen (1953) had come to the conclusion that at least the Corsican and Riviera submarine canyons were the submerged continuations of river-eroded canyons. The newer surveys apparently confirm this opinion, at least so far as the shapes of the canyons are concerned. As off Cape San Lucas, Lower California, and Carmel, -43° 20' -43° N 4°30'E. Canon de la Cossidagne du Planier Canon du Cap Couronne 5 20'E Fig. 9. The juncture between the submarine canyons off the French Riviera and those off the Gulf of Lyons. Note the absence of any indication of a major break which should be found if the canyons are respectively drowned river valleys and eroded by turbidity currents as suggested by Kuenen (1953). Contour interval 100 m. (After Bourcart, 1959.) California, the entire slope is cut up into what appears to be a maturely eroded subaerial joattern, very much like the mountain slopes on the adjacent land. Canyon center cores reported by Bourcart (1959) (some taken while the writer was assisting in the operation) indicated the jDresence of sand layers inter- bedded between mud, as in many other submarine canyons. The wall rocks are evidently crystalline along the deeply indented coast of Corsica and both granite and metamorphosed Paleozoics were found by Bourcart along the canyon walls off the Maritime Alps. The rather remarkable conformity between the canyon heads and the west coast bays of Corsica (Fig. 8) is unique. Yet the. 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 Hill, M. N. (Maur
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