214 J. W. SPEXCER — SUBMARIXE VALLEYS 



found another cove or gulf at 2,334 feet, which is probabl}^ a tributary 

 of the Delawarean valley from Great Egg harbor. 



The contoured chart brings out prominently the submarine peninsula 

 extending far seaward and separating the Susquehannan embayment 

 from that of the Hudson. 



THE HUDSONIAN VALLEY 



Mr Lindenkohl gives the head of the Hudson can3^on at 97 miles from 

 Sandy Hook, and in the next 23 miles shows that it descends from 234 

 to 2,844 feet (see page 210). The soundings in the line of the Hudson 

 channel beyond this point are unfortunately scanty, but from those on 

 either side, when connected by the intermediate contours drawn in the 

 usual waj^ parallel with the inner lines, the continuation of the valle}^ 

 may be inferred by the evidence of an embayment between 11,400 and 

 15,000 feet below sealevel, and in a distance of about 110 miles the de- 

 scent is found to be 8,500 feet from the bottom of the cul-de-sac above 

 mentioned, which is already nearly 3,000 feet below sealevel. 



In front of Narragansett bay there is a strong embayment in the 9,000- 

 foot contour, and here are several closely located soundings showing the 

 indentation of the continental slope. This valley seems to be a tribu- 

 tary to the Hudsonian embayment. 



THE FUNDI AN VALLEY 



Some distance eastward of the Cape Cod peninsula the continental 

 slope is narrowed to a zone of 50 miles, and here south off the Georges 

 shoals the edge of the submerged coastal plain is indented by two great 

 gulfs, one of which has a depth of 2,520 feet below the adjacent promon- 

 tory (which is 5,580 feet below sealevel, while the great cove is 8,100 

 feet). The other cul-de-sac shows 1,860 feet inside the 600-foot line and 

 farther on descends to 6,702 feet, while the bounding promontory, even 

 10 miles or more be3^ond, is covered b}^ a reduced depth of 5,802 feet of 

 water. Eastward of this point we reach the canyon of the Fundian 

 valle3^ which across the submarine coastal plain has already been de- 

 scribed. Its well marked channel at this point descends abruptly into 

 the canyon, which heads in an amphitheater having a depth of 4,080 * 

 feet, 10 miles within the 600-foot line. In the next 15 miles the descent 

 reaches to 6,984 feet. In another 30 miles its depth is 9,000 feet, and at 

 least 1,200 feet deeper than the adjacent sea floor. An indentation in 

 the lower zone of the continental slope corresponding with the valley is 

 plainly shown at 15,000 feet. 



♦This is a recent sounding, here used in place of 3,510 shown on map. 



