314 



HEEZEN ANIJ LAUGHTON 



[CHAF. 14 



1600 



(a) 



1800 



Small-Scale Roughness, Upper Continental Rise 



1700 



IBOO 



(b) 



1900 



2800 



Rolling Topography, Upper Continental Rise 



(c) 



2900 



3000 I! 



Ill N . i.» » ,i|ii j gl 



2700 



(d) 



2800 



Cape Verde Abyssal Plain 



West 



Abyssal Hills 



East 



Fig. 1. Typical Precision Depth Recorder records from the Canary Basin. Note the 

 marked contrast between the gentle topography of the continental rise, the extremely 

 smooth Cape Verde Abyssal Plain, and the intensely rough abyssal hills. Depth in 

 fathoms. (After Heezen et al., 1959.) 



