Figure 30. Seismic-reflection profile and interpretation of a section of line a81_225 (Needell and Lewis, 1984; Poppe and others, 2002), which crosses two of the eastern bathymetric depressions. These depressions are eroded into glaciolacustrine sediments, and the southern depression has formed between moraine and coastal plain sediments and filled with fluvial and estuarine sediments. A layer of fluvial and estuarine sediments overlies the glaciolacustrine sediments between the two depressions, and elsewhere modern marine sediments overlie the glaciolacustrine sediments. (Interpretations after Needell and Lewis, 1984). Location of profile is shown in figure 13.