Fig. 59—An area where charting of the coast line is difficult: Marshlands on Chesapeake Bay which are exposed at low tide and submerged at high tide. Location: South of the mouth of the York River, Virginia, between the estuaries of Poquoson River and Back River. Scale, about 1:2,500.
Fig. 60—Beach and bluff: Left shore of the York River north-northwest of Gloucester Point, Va., showing a tied island (one of the Mumfort Islands) and a narrow band of beach between the water and the bluff, which is 20 to 50 feet above the water. The plain back of the bluff is recognized by the checkered pattern made by the cultivated fields. Scale, about 1:9,000.
Fig. 61—A sandy beach with beach cusps forming the extreme northwestern end of Sandy Hook, New Jersey, showing, at the left, the end of the Hook surrounded by light-colored sand shading off to shoals and bars; at the right, a broad belt of sand where a new point is beginning to form; and, between them, six cusps arranged like saw teeth. Note that a wave breaks into foam at the point of each cusp. Scale, about 1:9,000.