390 



HKEZEN AND E\VIN<; 



[chap. 16 



CONTINENTAL 

 MARGINS 



FLEMISH 

 CAP 



BASIN 



MID ATLANTIC RIDGE 



BASIN 



CHANNEL 



47°N 



FATHOMS 



Fig. 2. Typical trans-Atlantic profile from Newfoundland to England. The depths indicated 

 in the lower portion of the figure are characteristic of this profile only, as the depths 

 of all provinces gradually fluctuate along the length of the ocean basin. The physio- 

 graphic provinces have been traced throughout the Atlantic and are believed to extend, 

 in a general way at least, throughout all oceans possessing a median-rifted ridge. 

 (Vertical exaggeration 40 : 1.) 



3500 



3S00 



3500 



"/ 4^ ;i //V Infill 



3500 



^.wvW-^^'hI^jVV^W^v^^v' 



22''N 



Fig. 3. On these profiles of the western North Atlantic the step provinces are shown as a 

 series of tilted fault blocks bounded by scarps. The difficulty of tracing the steps 

 from one profile to another is apparent. {\'ertical exaggeration 40:1.) 



