Contour Interval, 10 ft 



Figure 6. Delaware shelf valley off Delaware Bay entrance (Field 1979) 



Shelf Valley and shoals along its northern flank extend to the midshelf where 

 a large irregular shoal complex occurs past the terminus of the Valley. 



47. These features were described by Swift (1973) who also offered an 

 explanation of their origin and development, which is summarized below. The 

 Delaware Shelf Valley marks the retreat path of a large tidal channel created 

 as the Delaware Valley was progressively flooded during the Holocene 



22 



