the south, core 174 from the area of the presumed high-angle bedding 

 penetrated 9 feet (2.7 meters) into clean, coarse, gravelly sand contain- 

 ing some pebble and cobble-size material. The differences in sand texture 

 of the two cores indicate that this deposit may be highly variable in sand 

 grain size. 



It is estimated that this elongate deposit covers an area of 650,000 

 square yards. The erosion surface separating the lower and upper reflect- 

 ion subunits is very irregular; the upper subunit averages about 15 feet 

 (4.6 meters) in thickness. Assuming the entire upper reflection facies 

 is composed of sand, the volume available is 1.95 X 10^ cubic yards.. 



(6) New Inlet . The New Inlet site is centered at 42°10.1'N., 

 70°41.5'W. about 1 nautical mile (1.85 kilometers) off New Inlet (Fig. 25), 

 and lies in a section of relatively level bottom in 45 to 50 feet (13.7 to 

 15.2 meters) of water. The single seismic reflection profile crossing 



the site shows that the sand is part of the fill from what appears to be 

 an ancestral stream channel (Fig. 26) . Cores 192 and 193 recovered clean, 

 medium quartz sand from this site. The composite mean diameter of cored 

 material is 1.88 phi (0.272 millimeter); the estimated phi sorting is 0.89. 



If the drowned channel is an ancient extension of North River and 

 the deposit is continuous between the line and New Inlet, the area of 

 deposit would be approximately 840 X 10^ square yards. Using a minimum 

 thickness verified by cores of 10 feet (3 meters), the volume of sand 

 available would be 2.80 X 10° cubic yards. If the entire channel is filled 

 with similar sand, the volume would be 14 X 10^ cubic yards. 



Since the deposit (if it is an ancient stream channel) extends for 

 some indeterminate distance seaward, the potential reserve of sand may 

 be much larger than estimated. 



(7) Project NOMES Site . The site selected for project NOMES is 

 centered at approximately 42 20.7'N. , 70°47.7 'W. about 12 nautical miles 

 (22 kilometers) east of Deer Island (Fig. 14) in water depths of 70 to 

 105 feet (21.3 to 32 meters). The detailed geology of this site was 

 reported by Setlow (1973). The locale studied is a square area 14,000 feet 

 (4,267 meters) on a side. The deposit, which was to be the site of a 

 dredging experiment, measures about 12,000 by 7,000 feet (3,658 by 



2,134 meters) at the surface and trends north-northwest (Setlow, 1973). 



The deposit is expressed topographically as a flat-topped platform, 

 and contains mostly poorly sorted, gravelly sand, and sandy gravel 

 (Fig. 27) . Maps of the deposit at the surface (-5 and -10 feet) are shown 

 in Figures 28, 29, and 30. Measurements from Setlow (1973) show that in 

 the 10-foot thickness, the deposit contains a volume of approximately 

 19.5 X 10^ cubic yards (14.9 X 10^ cubic meters) of sand and gravel. 



VI. SUMMARY 



Survey data consisting of 242 statute miles of seismic reflection 

 profiles and 43 sediment cores were collected under the ICONS program 



58 



