288 



GUILCHER 



[chap. 13 



south as Agadir, down to 1600-2200 fin (Bremond, 1953; Lacombe, 1955; 

 Groiisson, 1957; Gougenheim, 1959). The northern part is shown in Fig. 6. 

 No true submarine canyon exists between 32° 40' and 35°N, and the slope is 

 straight in plan for the larger part of its course. Here also a conspicuous steepen- 

 ing has been revealed on several transverse profiles in the deeper part of the 

 slope, particularly off Azemmour, but not on all profiles. In some areas, the 

 foot of the scarp occurs at 1200-1300 fm, with a continental rise farther down ; 

 whereas in others the steep lower scarp extends down to 2200 fm and perhaps 



Depths in metres 



Fedala 

 CASABLANCA 



izemmour 

 (Mazogan 



Fig. 6. Continental shelf and slope off North Morocco. Depths in metres. Wide re-entrant 

 off the Rharb plain. (After French surveys, Gougenheim, 1959.) 



more. A wide re-entrant has been discovered off the flat Rharb i)lain, which lies 

 between the Meseta and the Rif chain : the sea floor shows a much more gentle 

 slope in this flat-bottomed depression, ^^'hich is bordered by two parallel sides 

 like the trough surveyed by Creager in the Bay of Camj)eche (see above). Off 

 the Rif chain, the topography of the slope is much more irregular than it is in 

 front of the Meseta as far south as 33°N. From Cape Cantin to Agadir it is even 

 more complicated, with many canyon-like depressions and a broad, convex 

 spur off Cape Tafelneh (31° 15'N). 



The existence of nine transverse profiles across the whole continental slope 

 of the Norwegian Sea, from West Norway to North S])itzl)ergen, has been 

 published by H. Holtedahl (1955, pp. 59-Gl). Most of these profiles show 



