CANSOAN, LAURENTIAK, AND NEWFOUNDLAND VALLEYS 215 



A short distance east of the Fundian canyon there is a fine cove deeply 

 indenting the edge of the submerged coastal plain at 600 feet, with a 

 depth of 3,648 feet. 



THE CANSOAN VALLEY 



The Cansoan valley, though interrupted by apparent drift deposits, 

 has a depth of 1,080 to 1,200 feet across the coastal plain, after which it 

 rapidly descends to 7,020 feet into a cove more than 2,000 feet deeper 

 than the adjacent floor to the southwest of it. 



THE LAURENTIAN VALLEY 



On reaching the edge of the continentel shelf, like the other valleys it 

 descends into an amphitheater 3,666 feet deep. This may be found to 

 be not the deepest part of a canyon-like valley when closer soundings are 

 taken, as was the case with the Fundian valley. Unfortunately the 

 soundings are few, and the continuation can not be located, but there are 

 several soundings which show a strong indentation in the continental 

 slope to a depth of 15,000 feet. From Placentia bay, Newfoundland, a 

 valley also passes over the margin of the banks by way of an amphithe- 

 ater or cove. 



VALLEYS OFF THE NEWFOUNDLAND BANKS 



Southeast of the Great bank the descending valley is seen within the 

 6C0-foot line at 3,120, at 11,100 (where it is 2,520 feet below the adjacent 

 submerged clifi*), and again it appears at 12,738 feet, indenting the 12,000- 

 foot line. Another similar valley occurs just north of this one, where 

 the cove reaches to 4,944 feet, while the adjacent shelf is only 690 feet 

 below sealevel. This valley is also traceable down the slope. Flemish 

 cap is the highest flat of the submerged bank of the most eastern exten- 

 sion of the continental mass. In this locality the great slope descends 

 very rapidly to oceanic depths ; but even here we find evidence of a cul- 

 de-sac of 5,000 to 6,000 feet deep. Between Flemish cap and the Great 

 bank the submerged plateau is deeply indented on both sides by large 

 valleys or embayments, which are here named Lesleyan bay (after Pro- 

 fessor J. P. Lesley, one of the originators of geomorphy), and Hullian 

 bay (after Professor Edward Hull, who has made similar studies on the 

 eastern side of the Atlantic). Northeast of Newfoundland banks other 

 valleys appear even among the scanty soundings, though there seems to 

 be more refilling by drift accumulations than on the other side of the 

 plateau. Thus while the fiord of Trinity bay attains a depth of 1,488 

 feet, it is not seen across the banks, while an adjacent one reaches to 



XXXI— Bull. Geol. Soc. Am., Vol. 14, 1902 



