Map G - Distribution of substrate mud content

U.S. Department of the Interior U.S. Geological Survey

Scientific Investigations Map 3341

Prepared in cooperation with the

National Oceanic and Atmospheric Administration 70°12'

70°13'

70°11'

70°10'

70°08'

70°09'

Map G 70°06'

70°07'

70°04'

70°05'

70°02'

70°03'

AGEN STELLW

42°19'

42°19'

BANK NATIO NAL M ARINE SANCT UARY

42°18'

42°18'

S T E

42°17'

42°17'

N I N

EAST NINETY BANK

A

Y E T

W L L

NORTH NINETY BANK

G E

42°16'

42°16'

M

N

E R E T

B A N K

42°15'

42°15'

N B A K S

42°14'

42°14'

MIDDLE NINETY BANK

42°13'

42°13'

SOUTH NINETY BANK

70°13'

70°12'

70°11'

70°10'

70°08'

70°09'

Mercator projection

70°06'

70°07'

70°05'

1 1

This map is not intended for navigational purposes.

.5

0 .5

1

2

0

3

4 KILOMETERS

1

2 NAUTICAL MILES

CONTOUR INTERVAL 5 METERS ADDITIONAL 1-METER CONTOURS INCLUDED TO SHOW BOTTOM ROUGHNESS DATUM MEAN LOWER LOW WATER

rr Me

ED GE

F JE

16

17

18

80

14

100

11

SS

HU

TT

80

4

5

Boulder ridges ≥1 m in height—Equivalent to substrate C of Map D

6

HANNEL OINT C CE P RA

3

80

Provincetown 42°00'N

Plymouth

Boulder ridges 20 to 50—Equivalent to substrate G2 of Map D

B GEN

SE

BOSTON

8

S

A LLW TE

AC

7

ST E BALLW SI AG N EN

12

200

80

MA

10

1

41°45'N

Mud content >10 to 20—Equivalent to substrate D2 of Map D

80

42°30'N

42°15'N

15

ANK

100

IES B

13

Mud content >5 to 10—Equivalent to substrates F and G1 of Map D

GULF OF MAINE

80

CAPE ANN

Mud content ≤1—Equivalent to substrates A1, A2, and B of Map D Mud content >1 to 5—Equivalent to substrates D1 and E of Map D

L

TILL

Gloucester

S EY FR

0

100

DESCRIPTION OF MAP UNITS

[Mud content is given as mean weight percent. See table 5 for textural characteristics of individual substrates. See Mapping Methods for explanation of topographic contour intervals]

70°00'W 10

ack River

70°15'W

40

42°45'N

70°30'W 80

im

70°45'W

70°02'

70°03'

SCALE 1:25 000 ONE CENTIMETER ON THE MAP REPRESENTS 250 METERS ON THE SEA FLOOR

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

71°00'W

70°04'

Map G.—Distribution of Substrate Mud Content 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

20 km CAPE COD

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.

By

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 substrate mud content, map G 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.

Page C. Valentine and Leslie B. Gallea 2015

ISSN 2329-132X (online) http://dx.doi.org/10.3133/sim3341