70°13' 70°10' 70°08' 70°06' 70°04' 70°02'

42°18'

42°19'

70°13' 70°11' 70°09' 70°07' 70°05' 70°03'

42°14'

42°16'

42°18'

42°19'

42°14'

42°16'

70°11' 70°09' 70°07' 70°05' 70°03'

70°12' 70°10' 70°08' 70°06' 70°04'

42°17'

42°15'

42°13'

42°15'

42°17'

70°12'

70°02'

Prepared in cooperation with the

National Oceanic and Atmospheric Administration

U.S. Department of the Interior

U.S. Geological Survey

42°13'

Scientific Investigations Map 3341

Map F

STELLWAGEN BANK NATIONAL MARINE SANCTUARY

STELLWAGEN BANK

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

DESCRIPTION OF MAP UNITS

[Fine-grained and coarse-grained sand content is given as mean weight percent. Grain 

sizes are listed in phi units. See table 5 for textural characteristics of individual 

substrates. See Mapping Methods for explanation of topographic contour intervals]

Substrate dominated by fine-grained sand—Muddy sand in which 

fine-grained sand (3 and 4 phi combined) constitutes the largest portion 

of the sand fraction; equivalent to substrates G1 and G2 of Map D

Substrate dominated by coarse-grained sand—Sand and sand partial 

veneer on gravel in which coarse-grained sand (2, 1, and 0 phi 

combined) constitutes the largest portion of the sand fraction; equivalent to substrates A1, A2, B, D1, D2, E, and F 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

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, Distribution of fine- and coarse-grained 

sand, map F 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

SCALE 1:25 000 

ONE CENTIMETER ON THE MAP REPRESENTS 250 METERS ON THE SEA FLOOR 

1 .5 0 1 2 3 4 KILOMETERS

1 .5 0 1 2 NAUTICAL MILES 

CONTOUR INTERVAL 5 METERS

ADDITIONAL 1-METER CONTOURS INCLUDED TO SHOW BOTTOM ROUGHNESS

DATUM MEAN LOWER LOW WATER

200

100

80 40

Merrimack River

0 20 km

CAPE COD

CAPE

ANN

Plymouth

Provincetown

Gloucester

BOSTON

MAS SACHUSETTS

BAY

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

10 11 12

4

1 2 3

14 15

181716

13

7

42°45'N

42°30'N

42°15'N

42°00'N

41°45'N

6

RACE POINT CHANNEL

BASIN STELLWAGEN

STELLWAGEN

BANK

JEFFREYS LEDGE

TILLIES 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.

Map F.—Distribution of Fine- and Coarse-Grained Sand

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