n6 



THE FLOOR OF THE OCEAN 



TJ? IS 



FIGURE 62. MAP SHOWING LOCATION OF CANYONS AND PRINCIPAL FURROWS 



OFF THE MID-ATLANTIC STATES; ALSO EXTENT OF THE CONTINENTAL SHELF 



AND LOCATION OF THE CONTINENTAL SLOPE. 



sea floor below sealevel. Within the 100-mile belt covered by 

 Lieutenant Smith fourteen canyons were given names. Only 

 five of them head more than two or three miles inside the 

 fall-off. 



The next four seasons of exploration covered in large part 

 the continental shelf and slope along a belt from Long Island 

 to a point off Norfolk, Virginia. From the soundings three 

 isobathic maps were drawn by the late A. C. Veatch. 5 This 

 belt, 250 miles long, portrayed five principal canyons, all head- 

 ing far back in the continental shelf. To suggest their relative 

 positions, they have been named, in order from north-northeast 

 to south-southwest, the Hudson, Wilmington, Baltimore, 

 Washington, and Norfolk canyons. 



