272 



HEEZEX AND MENAKD 



[chap. 12 



Fig. 33. Location of the mid-oceanic rift. (After Heezen et al., 1959.) 



Seismic Belt 



Atlantis *Seamount 



E Belgian Congo 



2 1500 ^ 



.Along 30° N, lot 

 Lake Tanganyika 



100 200 Along 14° S. lot 400 500 600 



Nouticol Miles 



PROFILES OF AFRICAN RIFT VALLEYS AND THE MID ATLANTIC RIDGE 



VERTICAL EXAGGERATION 40:i 



Fig. 34. Profiles of African Rift Valleys and the Mid-Atlantic Ridge. Note the vii-tual 

 identity of topographic features shown in these three profiles across the seismic belt 

 of the mid-oceanic ridge system. (After Heezen, 1958.) 



