Figure 4.6. Shaded relief map of seafloor topography (upper left) east of Marblehead Neck with red arrows indicating moraine segments. Map of physiographic zones in this area (upper right) is based on seafloor topography and dominant substrate properties. Both maps are overlain on NOAA-NOS nautical chart #13275. See figure 4.4 for location of maps. Yellow circles indicate bottom photographs A-F (bottom). The distance across the bottom of the photographs is approximately 50 cm.