Large-Scale Features 



35 



90° 6(f 70' 60° 50° 40° 30° 20° 10° 0" 10° 20' 30° 



120° 110° 100" 90° 60° 70° 60° 50° 40° 30° 20° 10° 0° 10° 20° 30° 40° 50° 60° 



Fig. 10. Depth in hundreds of meters of the 26-5 a^ surface, according to 

 Montgomery and PoUak (1942, fig. 12). 



3-2 



