Figure 17. Map showing the distribution of sediment textures within Vineyard and western Nantucket Sounds on the basis of the bottom-type classification from Barnhardt and others (1998) (fig. 7). The green polygon is indicative of general confidence level of the interpretations, with high-confidence interpretations inside, and low-confidence interpretations outside. The black rectangle shows the extent of figure 18, and black lines show the locations of seismic profiles A-A' and B-B' from figures 10 and 11, respectively. The bathymetry hillshade relief map underlying the sediment texture layer is derived from the composite bathymetry in figure 3.