fan resulted from deltaic sedimentation by the Housatonic River as it flowed 

 south through the moraine. The Lordship head has a maximum dimension of 

 almost 16 kilometers and extends well into the Sound, and is one of the most 

 promising areas for sand and gravel. Using acoustic profiling equipment, 

 Flint and Gebert (1976) surveyed areas of the Sound online with the Madison 

 and Old Saybrook Moraines and were able to differentiate between bedrock 

 islands close to the Connecticut shore and seven shoals and islands composed 

 of till which are the morainal extensions. Their conclusions are also sup- 

 ported by this study. Figure 8 shows that Crooked Shoal, Branford Reef, and 

 Townshend Ledge are seaward extensions of the Madison Moraine, and that 

 Kimberley Reef, Falkner Island, Goose Island, and an unnamed shoal represent 

 extensions of the Old Saybrook Moraine. 



Figure 8. Map of coastal Connecticut from Branford to Hammonasset Point 

 showing the location and alinement of several shoals and 

 islands determined to be remnants of the Madison and Old 

 Saybrook Moraines (modified from Flint and Gebert, 1976). 



In western Long Island, Newman (1977) identified the Elmhurst Moraine 

 immediately north of the Harbor Hill Moraine in Queens County, Long Island, as 

 an irregular and curving line of kame deposits (Fig. 9). Based on its north- 

 east strike, Newman extended the moraine into the Sound where it continues 

 northeast defined by the shoal contours of Execution Rocks and the elongate 

 shape and position of the Norwalk Islands. 



Based on radiocarbon dating, Newman (1977) believes that the Elmhurst 



glacial advance occurred about 13,500 years B.P. and was part of the Port 



Huron readvance that took place in the Great lakes region. The geologic 

 events are summarized in Table 3. 



The profiles and cores collected in this study have been useful in iden- 

 tifying additional glacial depositional features shown in Figure 10. About 

 7.2 kilometers south of the Old Saybrook Moraine, a moraine segment almost 9 



26 



