USGS Report Series 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

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

/ Title Page / List of Figures / Conversion Factors / Abbreviations / Abstract / Introduction / Methods / Results / Discussion / Summary / Acknowledgments / References Cited / Appendix — Geospatial Data / Citation Page /

Figure 2. Sea-level curve for the southern Merrimack Embayment from Barnhardt and others (2009), modified after Oldale and others (1993). Following deglaciation, relative sea-level (RSL) fell in northeast Massachusetts in response to ice removal. Near the end of the Pleistocene, about 12,000 years before present (yr B.P.), sea level reached a lowstand of about -50 meters (m) before it began to rise again. Note the age scale changes at 8,000 yr B.P.

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