Figure 29. Seismic-reflection profile (Needell and Lewis, 1984; Poppe and others, 2002) and interpretation of a section of line a81_224, which crosses the west-central part of the study area. Stratified glaciolacustrine sediments are draped over acoustic basement interpreted to be bedrock. A fluvial unconformity can be seen cutting into the glaciolacustrine sediments southeast of the bedrock. Modern marine sediments overlie the glaciolacustrine and fluvial/estuarine sediments. Location of profile is shown in figure 13.