deposit and contains 1.2 meters of medium to coarse sand overlying 2.7 meters 

 of clean, coarse sand and gravel with 0.6 meter of fine to medium sand at the 

 base of the core. The volume of sand and gravel within the limits of area E 

 is calculated to be 4 million cubic meters; however, cores 42 and 44 suggest 

 that the deposit may be considerably larger and may extend to the north and 

 east. Cores 8 and 43 to the west contain sediment that is considerably finer 

 in grain size than core 9 and both have a higher silt and clay content. 



f. Area F - Bridgeport Shoal. Area F is a triangular-shaped shoal about 

 7.2 kilometers southeast of Bridgeport at the mouth of the Housatonic River 

 with its base at Lordship on the Connecticut shore, and its apex projecting 

 southward about 5.4 kilometers into Long Island Sound (Fig. 19). The shoal 

 appears to end abruptly at the 18.3-meter contour but a discontinuous exten- 

 sion may continue south at Stratford Shoal toward Crane Neck on Long Island. 

 Water depths over the deposit range from about 6 to 18 meters. Data coverage 

 consists of two east-west and one north-south seismic profiles as well as 

 cores 12 to 15, 49, 53, and 54. These data show that the shoal is a highly 

 stratified outwash delta that varies in thickness from to 9.1 meters, with 

 the southern one-third being the thickest (Fig. 21). This shoal appears to be 

 the submerged and southerly extension of the Lordship outwash head described 

 by Flint (1968). On land the outwash feature is composed of coarse-grained 

 sediment with boulders as large as 1 meter. This sediment may also be present 

 in area F, but none is obvious from the seismic data. The sand body probably 

 originated as a glaciofluvial delta of the Housatonic River during a very late 

 Wisconsin glacial advance in central Connecticut. 



All seven cores in this area contain sand and only core 54 penetrated the 

 sand body and recovered an underlying substratum of dark brown clay. Cores 17 

 and 48 to the west and cores 50, 51, and 52A to the east of the deposit show 

 the shoal flanks are overlapped by muddy modern sediments which blanket adja- 

 cent bottom areas. 



The sand contained in the outwash shoal is typically light brown, medium 

 to coarse (0.25 to 1.00 millimeter; 2.0 to 0.0 phi) quartz sand with sparse 

 shells and, locally, up to 15 percent small gravel. Since the sand is clean, 

 generally free of fine particles, and is sufficiently variable in size charac- 

 teristics from place to place, selective borrowing could be used to obtain 

 desired size grading. Computations based on the seismic and core data show 

 that the Bridgeport area has the highest potential of any of the deposits 

 along the Connecticut shore of Long Island Sound. Using a thickness of 3.9 

 meters, the sand and gravel volume is 37 million cubic meters; however, the 

 actual inplace volume may be more than twice this amount. 



g. Area G . Area G, a circular deposit north of Old Field Point and Crane 

 Neck on the Long Island northshore (Fig. 22), lies within the 6- to 15-meter 

 contours and is defined by seismic profile line 11 and core 21. The seismic 

 profile shows the area is underlain by horizontal sedimentary strata and core 

 21 contains a fairly uniform mixture of silty fine to very coarse sand with 

 pebbles up to 6.4 centimeters in diameter. The deposit appears to have origi- 

 nated from Pleistocene glaciofluvial or glacial deposition processes and may 

 be genetically related to the Bridgeport deposit (area F) and Stratford Shoal, 

 both of which are alined to the north across the Sound. The limited data cov- 

 erage in area G makes resource calculations inprecise but based on a thickness 

 of 3.3 meters, the computed volume of sand present is 5 million cubic meters. 



44 



