U.S. Geological Survey Open-File Report 2012-1157
Shallow Geology, Seafloor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts
Figure 14. The distribution of sediment textures based on a modified Shepard (1954) and Schlee (1973) classification within the study area from Nahant to northern Cape Cod Bay. The classification used here is based on eight units, which include solid (for rocky substrates), gravel, gravelly sediment, sand, sandy silt, silty sand, silt, and clayey silt.