Figure 22. Map of sand and gravel deposits D and G along the north shore of 

 Long Island. 



h. Area H - Port Jefferson Shoal . The Port Jefferson deposit is on the 

 north shore of Long Island 3.6 kilometers east of area G. Area H lies in 

 water depths of 6 to 15 meters and, like area G, is defined by one seismic 

 profile and core 78 (Fig. 23). Core 78 shows that the top 0.5 meter of the 

 deposit consists of silty medium sand underlain by coarse sand to -1.8 meter, 

 and that the base of the deposit to -2.7 meters is composed of brown, poorly 

 sorted fine to very coarse sand and significant amounts of pebbles. The area 

 H deposit is closely related to the adjacent Harbor Hill Moraine, and is pos- 

 sibly continuous with area G to the west as well as with areas J, L, and M to 

 the east. Offshore, the sand and gravel of area H is overlapped by fine- 

 grained sediments. The calculated volume of sand and gravel in the area is 5 

 million cubic meters based on a thickness of 2.7 meters. 



i. Area I - Milford Shoal. Area I is situated about 1.8 kilometers off 



the Connecticut coast just south of the town of Milford and southwest of New 

 Haven (Fig. 24). It comprises the southern part of a shoal which extends from 

 about the -6-meter water depth close to shore to the -9-meter contour 2.7 kil- 

 ometers offshore. Core 57 at the northern part of the shoal shows that it is 

 composed of fine to very coarse sand. The periphery of the shoal is sharply < 

 defined and cores 55 and 56 to the southwest and northwest show the adjacent 

 bottom is considerably finer in grain-size diameter. Using a thickness of 3.7 

 meters, the computed volume of sand and gravel in area I is 10 million cubic 

 meters. 



46 



