236 



HEEZEN AND MENARD 



[chap. 12 



r 



EARTH'S CRUST 

 I 



[CONTI NENTS 



□ 



B 



_. ISLAND ARCS ,^ 



MEDITERRAfMEANS 



OCEANS 



I CONTINENTAL MARGIN 



I 



] [W 



CO 



1 



X 



OCEAN-BASIN FLOOR | |MID-OCE"aNIC RIDGEI 



I 



1 



[ABYSSAL FLOORl [OCEANIC RISESi |FLANKS[ [CREST 



r^ 



cc 



m 



2 



Fig. 4. Outline of submarine topography. Line 1, first-order features of the crust; line 2, 

 major topographic featiu-es of the ocean ; line 3, categories of provinces and super- 

 provinces ; line 4, provinces ; line 5, sub-provinces and other important features. (After 

 Heezen et al., 1959.) 



CONTINENTAL MARGIN PROyiHCES, 

 TYPE PROFILE OFF NORTHEASTERN U.S.A. 



INNER 

 SHELF 



■.OUTER 

 I SHELF 



O fathoms 



continental 

 shelf 



■shelf break 



f^on 



1000 



1500 



2000 



upper 

 continental rise. 



2300% 2400\ 



. , ■ i <^2450 



^/oiver conlinentol r/s e^^/^^««[.i2600 ' 



2500 



,-2750 



2750) 



C ON Tl MENTAL 



RISE 



*" abyssal plain Bermuda rise 



Fig. 5. Continental margin provinces : type profile off northeastern United States. Profile 

 plotted from P.D.R. records. This profile is representative of the sector from 

 Georges Banks to Cape Hatteras, eastern United States. (After Heezen et al., 1959.) 



