U.S. Geological Survey Open-File Report 2015-1153
/ Title Page / List of Figures / Conversion Factors / Abbreviations / Abstract / Introduction / Methods / Results / Discussion / Summary / Acknowledgments / References Cited / Appendix — Geospatial Data / Citation Page /
Figure 15. The distribution of physiographic zones within the study area from Nahant to Salisbury, including western Massachusetts Bay. The physiographic zone classification is based on Kelley and others (1996) and builds on interpretations developed by Butman and others (2003a,b,c; 2004) and Knebel and Circe (1995), and the zones are delineated on the basis of sea-floor morphology and the dominant texture of surficial material. Areas interpreted by Barnhardt and others (2006, 2009) and Pendleton and others (2013) are shown for regional context and have a slight gray transparency.