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U.S. Geological Survey Open-File Report 2015-1153

Sea-Floor Texture and Physiographic Zones of the Inner Continental Shelf From Salisbury to Nahant, Massachusetts, Including the Merrimack Embayment and Western Massachusetts Bay


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Image of 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.

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.

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