100

50

500400

300200

150

50

100

150

300

200

150

100

50

110

100

90

80

70

60

50

40

30

90

80

70

60

40

20

10

150

140

130

120

110

100

20

20

20

80

70

60

50

40

30

150

140

130

120

110

100

90

80

70

60

50

40

30

100

30

30

30

data gap

Willapa 

Bay

Grays

Harbor

Willapa

Canyon

Grays

Canyon

Quinault

Canyon

Point Grenville

Cape Elizabeth

Cape

Shoalwater

Grayland

Cape

Disappointment

Illwaco

Long Beach

Long 

Island

Long Beach

Peninsula

Raymon

Aberdeen 

Hoquiam

Ocean Shores

Copalis Beach

Pacific Beach

Taholah

Queets

Quina ult River

Copalis River

Connor Creek

Moclips River

Raft River

Humptulips River

Queets River

Hoh River

Wi

Col umb

124°45' 124°30' 124°15' 124°00' 1

46°15'

46°30'

46°45'

47°00'

47°15'

47°30'

124°45' 124°30' 124°15' 124°00' 123°4

 5 10 1

 50 55 6

 95 100 1

140 145 1

Control po

 of surfac

EXPLANATION

30

40

Late Pleistocene (<150 ka) erosional unconformity,

 modified from Peterson and Phipps, (1992), Wolf and

 others (1997, 1998)

Elevation of surface, in meters

 below sea level. Depths calculated

 from two-way travel times using a

 seismic velocity of 1,500 m/s.

 Contour interval is 10 m, with

 dashed 5-m supplemental contours

Areas where bedrock forms the

 erosional surface at the sea floor

Areas in Willapa Bay where bedrock

 forms the surface of the buried

 erosional unconformity

Control points; color indicates elevation

 of surface in meters below sea level

Bathymetric contour, in meters below

 sea level 

200

100

50

500

400

300200

150

50

150

100

300

200

150

100

50

A

B

E C

I

H

K

J

D

F

G

14B

19B

19B

19A

18A

18B

15C

16C

16B

?

?

Figure 6

Figure 7C

Figure 7A

Figure 11A

Figure 11B

Figure 8A

Figure 8B

Figure 10

Figure 8C

Figure 11C

Figure 17

Figure 11C

*

*

data gap

Willapa 

Bay

Grays

Harbor

Willapa

Canyon

Grays

Canyon

Quinault

Canyon

Point Grenville

Cape Elizabeth

Cape

Shoalwater

Grayland

Cape

Disappointment

Illwaco

Long Beach

Long 

Island

Long Beach

Peninsula

Raymond

Aberdeen Montesano

Hoquiam

Ocean Shores

Copalis Beach

Pacific Beach

Taholah

Queets

Quina ult River

Copalis River

Connor Creek

Moclips River

Raft River

Humptulips River

Queets River

Hoh River

Chehalis River

Willapa River

Col umbia River

"Willapa Bay" fault zone

"Grays Harbor" fault zone

"Saddle Hill" fault zone

124°45' 124°30' 124°15' 124°00' 123°45'

46°30

46°45'

47°00'

47°15'

47°30'

47°45'

46°15'

46°30'

46°45'

47°00'

47°15'

47°30'

124°45' 124°30' 124°15' 124°00' 123°45'

Figure 8C

19B

K

EXPLANATION

Fault (age indicated

 by color code at right)

 Strike-slip

 Dip-slip (normal or

 high angle)—bar and

 ball on downthrown side

 Dip-slip (thrust or

 low angle)—sawteeth

 on upper plate

Anticline

Syncline

Approximate basement

 block boundary (see text)

Location of seismic or

 geomorphic profile shown

 in figure

Location of seismic profile

 shown in plate 2

Location and direction of view

 of photo shown in figure

Age of most recent

 structural movement,

 in ka

 ≤ 20

 ≤ 150

 ≤ 780

 ≤ 1,800

 unspecified

Structural control

 point where data

 constrain fault

 geometry and age

Mud volcano on sea

 floor (off Hoh and

 Copalis Rivers)

Bathymetric contour,

 in meters below

 sea level

*

200

BATHYMETRIC CONTOUR INTERVAL 50 METERS

VERTICAL DATUM NAD 83 OF 1983

SCALE 1 : 250,000

0 10 20 MILES

0 5

5

15

15

10 20 KILOMETERS

WASH

ORE

CALIF

MAP LOCATION

BATHYMETRIC CONTOUR INTERVAL 10 METERS

VERTICAL DATUM NAD 83 OF 1983

SCALE 1 : 250,000

0 10 20 MILES

0 5

5

15

15

10 20 KILOMETERS

WASH

ORE

CALIF

MAP LOCATION

MAPS SHOWING QUATERNARY STRUCTURES IN THE SOUTHERN

WASHINGTON CONTINENTAL SHELF AND ADJACENT COASTAL AREAS

By

Patricia A. McCrory, David S. Foster, William W. Danforth, and Michael R. Hamer

2002

PLATE 1A—QUATERNARY FAULTS AND FOLDS PLATE 1B—LATE PLEISTOCENE EROSIONAL UNCONFORMITY INFERRED TO BE A PALEOSHELF SURFACE

McCrory, P.A., Foster, D.S., Danforth, W.W., and Hame

Leading Edge of the Oregon Coast Range Block, Offsh

River): US Geological Survey Professional Paper 1661

On-land base from U.S. Geological Survey National Elevation Dataset 

[http://gisdata.usgs.gov/ned]. Bathymetric base from National Oceanographic & 

Atmospheric Administration-National Oceanographic Service, 1997. Roads and rivers 

from Environmental Systems Research Institute, 1999.

Universal Transverse Mercator projection 

On-land base from U.S. Geological Survey National Elevation Dataset 

[http://gisdata.usgs.gov/ned]. Bathymetric base from National Oceanographic & 

Atmospheric Administration-National Oceanographic Service, 1997. Roads and rivers 

from Environmental Systems Research Institute, 1999.

Universal Transverse Mercator projection 

U.S. GEOLOGICAL SURVEY