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70°02' 70°04' 70°06' 70°08' 70°10' 70°13' 42°18' 42°19' 70°03' 70°05' 70°07' 70°09' 70°11' 70°13' 42°14' 42°16' 42°18' 42°19' 42°14' 42°16' 70°03' 70°05' 70°07' 70°09' 70°11' 70°12' 70°10' 70°08' 70°06' 70°04' 42°17' 42°15' 42°13' 42°13' 42°15' 42°17' 70°12' 70°02' U.S. Department of the Interior U.S. Geological Survey Scientific Investigations Map 3341 Map E STELLWAGEN BANK NATIONAL MARINE SANCTUARY S T E L L W A G E N B A N K N I N E T Y M E T E R B A N K S NORTH NINETY BANK SOUTH NINETY BANK EAST NINETY BANK MIDDLE NINETY BANK Mercator projection Geodetic Reference System 1980; North American Datum of 1983 Longitude of central meridian 70°19' W; latitude of true scale 41°39' N False easting 0 m; false northing 0 m This map is not intended for navigational purposes. DESCRIPTION OF MAP UNITS [Sediment mobility is based on the presence of sand ripples observed in video and photographic imagery. See Mapping Methods for explanation of topographic contour intervals] Mobile sediment—Rippled sand; equivalent to substrate A1 of Map D Mobile and immobile sediment—Rippled sand overlying immobile cobble and boulder gravel; equivalent to substrate B of Map D Immobile sediment—Sand, sand partial veneer on gravel, and muddy sand; equivalent to substrates A2, D1, D2, E, F, G1, and G2 of Map D Boulder ridges <1 m in height—Equivalent to substrate C of Map D Boulder ridges ≥1 m in height—Equivalent to substrate C of Map D 200 100 80 40 M e r r i m a c k R i v e r 0 20 km CAPE COD CAPE ANN Plymouth Provincetown Gloucester BOSTON M A S S A C H U S E T T S B AY GULF OF MAINE 71°00'W 70°45'W 70°30'W 70°15'W 70°00'W Location Map.—Shows quadrangle 6 (highlighted in yellow). Stellwagen Bank National Marine Sanctuary boundary is shown as a dashed line. Bathymetric contours are labeled in meters. 40 100 100 100 100 80 80 80 80 40 80 80 40 40 CAPE COD BAY 8 5 9 12 11 10 4 1 2 3 15 14 18 17 16 13 7 42°45'N 42°30'N 42°15'N 42°00'N 41°45'N 6 R A C E P O IN T C H A N N EL S T E L L W A G E N B A N K BASIN STELLWAGEN JEFFR EY S L E D G E TILLIES BANK Map E.—Sediment Mobility Seabed Maps Showing Topography, Ruggedness, Backscatter Intensity, Sediment Mobility, and the Distribution of Geologic Substrates in Quadrangle 6 of the Stellwagen Bank National Marine Sanctuary Region Offshore of Boston, Massachusetts By Page C. Valentine and Leslie B. Gallea 2015 Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government Digital files available at http://pubs.usgs.gov/sim/3341/ Suggested citation: Valentine, P.C., and Gallea, L.B., 2015, Sediment mobility, map E of Seabed maps showing topography, ruggedness, backscatter intensity, sediment mobility, and the distribution of geologic substrates in quadrangle 6 of the Stellwagen Bank National Marine Sanctuary region offshore of Boston, Massachusetts: U.S. Geological Survey Scientific Investigations Map 3341, scale 1:25,000, http://dx.doi.org/10.3133/sim3341. ISSN 2329-132X (online) http://dx.doi.org/10.3133/sim3341 Prepared in cooperation with the National Oceanic and Atmospheric Administration SCALE 1:25 000 ONE CENTIMETER ON THE MAP REPRESENTS 250 METERS ON THE SEA FLOOR 4 KILOMETERS 1 .5 0 3 2 1 2 NAUTICAL MILES 1 .5 0 1 CONTOUR INTERVAL 5 METERS ADDITIONAL 1-METER CONTOURS INCLUDED TO SHOW BOTTOM ROUGHNESS DATUM MEAN LOWER LOW WATER
