SCALE 1:24 000

1

0

1

1 1

.5 0

WASHINGTON

MAP LOCATION

.5

0 1 2 3

KILOMETERS

THOUSAND FEET

MILES

47o

30'45"

27'30" 1 610 000 FEET

5249

5250

5253

5255

(GIG HARBOR)

(TACOMA NORTH) (POVERTY BAY) (DES MOINES)

(SEATTLE SOUTH)

(DUWAMISH HEAD) (BREMERTON EAST)

150 000 FEET

25' 00"

27'30" 

5254

5257

5258

5259

47o

 22'30"

122o

 22’30” 

122o

122 540 541 543 545 22'30" o

30'00"

47o

30'45" (OLALLA)

5252

47o

22'30" 

122o

30'00" 1 590 000 FEET 25' 00" 545 539 542 543 546000m.E.

5247000m.N.

546

16.13o

27'30" 

539

5260000m.N.

5249

5250

25' 00"

5252

5253

5254

5255

5256

27'30" 

5257

5258

5259

5260

APPROXIMATE MEAN

DECLINATION, 2015

MAGNETIC NORTH

TRUE NORTH

542

1 80 000 FEET

5251

5248

540

5247

5248

5251

2015

1 2

Geologic Map of the Vashon 7.5' Quadrangle and Selected Areas, King County, Washington

By

Derek B. Booth, Kathy Goetz Troost, and Rowland W. Tabor 1

U.S. Department of the Interior

U.S. Geological Survey

Scientic Investigations Map 3328

Pamphlet accompanies map

1 University of Washington, Seattle

2 U. S. Geological Survey

Any use of trade, product, or firm names in this publication is for 

descriptive purposes only and does not imply endorsement by the 

U.S. Government

When this map is printed on an electronic plotter directly from digital 

files, dimensional calibration may vary between electronic plotters 

and between X and Y directions on the same plotter, and paper may 

change size due to atmospheric conditions; therefore, scale and 

proportions may not be true on plots of this map.

For sale by U.S. Geological Survey, Information Services, Box 25286, 

Federal Center, Denver, CO 80225, 1–888–ASK–USGS

Digital files available at http://pubs.usgs.gov/sim/3328/

Suggested Citation: Booth, D.B., Troost, K.G., and Tabor, R.W., 2015. 

Geologic map of the Vashon 7.5’ quadrangle and selected areas, King 

County, Washington: U.S. Geological Survey Scientific Investigations 

Map 3328, 22 p., scale 1:24,000, http://dx.doi.org/10.3133/sim3328

ISSN 2329-132X (online)

http://dx.doi.org/10.3133/sim3328

Prepared in cooperation with

King County, Washington

Geology mapped by D.B. Booth, 1987–2004 

and K.G. Troost, 1999–2004

Lidar interpretation by R.W. Tabor, D.B. Booth, 

and K.G. Troost, 2012–13

Database and digital cartography by Aaron 

Wisher, Philip Dinterman, Matt Anders, Alison 

Duvall, and Rowland Tabor

Edited by J.L. Zigler

Manuscript approved for publication April 23, 

2015

Hillshade image calculated from 6-ft lidar DEM, 

Pudget Sound Lidar Consortium. Lidar data

acquired 2001–2002. Base map culture cartography interpreted

from lidar by R.W. Tabor (2012). Road data from King County

lidar (http://www5.kimgcounty.gov/gisdataportal/)

and Google Earth.

SW 204th St

SW Bank Rd

Old Mill Rd SW

SW Cemetery Rd

SW Cove Rd

Ridge Rd

75th Ave SW

115th Ave SW

SW Point Robinson Rd

Beall Rd SW

SW 232nd St

SW 248th St

SW 220th St

SW 156th St

SW 240th St

91st Ave SW

111th Ave SW

Dockton Rd SW

Westridge Hwy SW

Monument Rd SW

87th Ave SW

SW 188th St

SW 112th St

107th Ave SW

SW Dilworth Rd

SW 238th St

Glen Acres Rd

SW Gorsuch Rd

SW 216th St

Glen Acres Rd SW

SW 244th St

107th Way SW

SW 236th St

121st Ave SW

SW 193nd St

Singer Rd SW

Kingsbury Rd SW

Westside Hwy SW

119th Ave SW

103rd Ave SW

125th Ave SW

SW 148th St

SW127th St

SW 171st St

SW Bayview Dr

SW 140th St

SW 116th St

SW Maury Park Rd

81st Ave SW

93rd Ave SW

63rd Ave SW

99th Ave SW

SW 198th St

SW 159th St

SW 178th St

97th Pl SW

105th Ave SW

98th Ave SW

SW 250th Way

96th Pl SW

43rd Ave SW

SW Luna Beach Rd

A

mr strong Rd

SWawthorne Ln

104th Ave SW

SW 248th St

SW 156th St

107th Ave SW

SW 216th St

115th Ave SW

115th Ave SW

107th Ave SW

99th Ave SW

Vashon Hwy SW

Vashon Hwy SW

Vashon Heights

Dolphin

Point

Point

Vashon

Cowley

Cedarhurst

Scales Corner Glen Acres

Dilworth

Colvos

Bethel Park

VASHON

Vashon

Landing

Sylvan Beach

Sandy Beach

Peter

Point

Point Beals

Chautauqua

Point Heyer

Ellisport

Portage

Quartermaster

Kingsbury

 Beach

Mileta

Burton

Burton Acres

 Park

Magnolia Beach

Quartermaster Heights

Vashon

 Center

Paradise

Valley

Fern

Heath

Raeco

Racoma

Luana Beach

Gold Beach

M A U RY I S L A N D

VA S H O N ISLAND

Three Tree

Point

Vashon

Municiple

Airport

Point

Robinson

A

A’

T9,T12, T14, T15, T16

T17, R18, WA-29

N37

N36

WA-28

T9,T12, T14, T15, T16

T17, R18, WA-29

N37

8

10

8

18

4

3

Qlsq

Qvi

Qvt

Qvt

Qvt

Qva

Qvt

Qvt

Qvt

Qva

Qva Qvt

(Qvi)

Qvt

Qva

Qvt

Qva

Qva

Qva

Qvr

m

Qvt

Qva

(Qpff)

Qvi

m

m

hs

Qva

Qva

Qva

Qbtf

m

Qva

Qpff

Qvt

m

Qbtf

Qvi

Qvr

Qvr

Qva

m

Qvr

Qvt

Qva

Qva

m

Qfo

Qvr

Qvr

Qvt

Qoa

Qva

Qvr

m

Qols

Qva

Qvi

Qva

Qw

m

Qpff

(Qvrl)

Qpff

Qvrl

Qvt

m

Qvrl

Qvr

Qfo

Qvt

Qvr

(Qva)

Qpff

Qfo

m

Qols

Qva

Qfo

Qf

m

Qbtf

Qwbc

Qbtf

Qvr

Qvr

Qva

Qols

Qols

m

Qls

Qf

m

Qva

Qwbc

Qva

m

Qvt

Qf

Qfo

Qva

Qbtf

m

Qbtf

Qbtf

Qpff

Qpff

m

Qbtf

m

Qbtf

Qva

Qpff

Qw

Qva

Qva

Qpff

m

Qpff

m

Qw

Qwbc

m

Qva

Qpf

Qa

Qw

Qa

Qpff

Qva

Qvrc

m

Qva

Qpff

Qrm

Qf

Qva

Qpff

Qwbc

Qa

Qvlc

Qwbc

Qvr

m

Qpff

m

Qpff

Qva

Qf

m

m

m

Qvr

m

Qls

m

m

Qoa

Qpff

Qw

Qvi

Qrm

Qmw

Qols

Qwbc

Qmw

Qvr

Qfo

Qbtf

Qpog

Qf

m

Qvr

Qols

Qols

Qa

Qa

Qoa

Qls

Qlsq

Qvt

m

Qpdt

Qbtf

Qvt

Qvrc

m

Qoa

Qpog

Qoa m

Qls

m

Qols?

m

Qmw

Qbtf

m

m

Qmw

Qpdf

Qls

Qf

Qfo

Qls

Qls

Qpfc

Qls

Qfo

Qva

Qpff

Qmw

Qls

Qa

Qpdf

Qpfc

Qoa

m

Qa

Qva

Qols

Qoa

Qfo

Qa

Qls

m

Qpff

Qls

Qva

Qwbc

Qva

Qfo

m

Qa

Qls

Qrm

m

m

Qpff

m

m

m

Qwb

Qvi

Qa

m

Qa

Qvrls

Qmw

Qbo

Qls

Qlsq

m

Qbtf

Qls

Qmw

Qvlc

Qa

Qwb

Qvr

Qf

Qls

Qw

Qf

m

Qvrc

m

m Qbo

Qls

Qf

m

Qls

Qpdt

m

Qa

Qfo

Qfo

Qvrc

Qls

Qls

Qols?

m

Qls

Qls

Qls

Qoa

Qls

Qmw

Qls

Qols

m

Qa

Qva

Qpdt

Qw

m

Qf

Qpff

Qva

Qf

Qf

Qfo

Qpff

Qvlc

Qoa

Qpogt

Qls

m

Qfo

Qvt Qlsq

Qoa

m

Qoa

m

Qoa

m

Qvlc m

m

Qoa

Qfo

(Qva)

Qls

Qa

Qva

m

Qbtf

Qfo

m

Qfo

Qls

Qrm

Qoa

Qols

Qpfc

Qlsq

Qvr

Qls

Qls

Qwbc

Qoa

Qls

Qvlc

Qpon

Qlsq

Qfo

Qvrc

m

m

Qpof

Qls

m

Qlsq

Qlsq

Qlsq

Qmw

Qls

Qf

Qls

Qlsq

m

Qbo

Qls

Qbo

Qlsq

Qpon

Qlsq

Qa

Qlsq

Qvrc

Qoa

Qoa

Qlsq

Qpogt

Qfo

Qf

Qls

Qls

Qpff

m

Qls

m

Qlsq

Qponf

Qoa

Qlsq

m

Qols

Qols

m

Qols

Qls

Qfo

Qpogf

Qlsq

Qwb

Qfo

Qf

Qlsq

m

Qpogt

Qvlc

Qlsq

Qwbc

m

m

Qvr

Qlsq

Qrm

m

Qlsq

Qls

Qlsq

Qoa

Qfo

m

Qls

m

Qls

Qls

Qvlc

m

m

Qa

m

Qa

Qls

Qls

Qwbc

Qpdc

Qvrc

Qf

Qmw

Qpff

Qlsq

Qls

Qls

m

Qfo

Qlsq

m

Qa

Qrm

Qpdc

Qoa

Qf

Qols

Qva

Qoa

Qpff

Qls

Qls

m

Qls

m

Qvrc

Qwb

Qa

Qpdf

Qpdt

Qa

m

Qols?

Qoa

Qls

Qlsq

Qoa

Qa

Qls

Qpdt

Qmw

Qpff

Qls

Qlsq

m

Qls

Qls

Qls

Qls

Qlsq

Qpogf

Qls

Qls

Qlsq Qlsq

Qlsq

Qpff

Qvrc

Qpdf

Qlsq

m

Qva

Qlsq

m

Qpdt

Qlsq

Qls

Qlsq

Qpdf

Qoa

Qpdt

Qpdf

Qpdf

Qpogc

Rabbs

Lagoon

Qbtf

Qva

m

m

Qbo

Qbo

Qw

Qf

Qvrl

Qa

Qvi

Qvt

Qvt

Qf

Qvt

m

Qbtf

(Qvt)

Fisher

Creek

J u d d

C r e e k

Wildwood

Pond

QUARTERMASTER

HARBOR

TRAMP

HARBOR

Frenchmans

 Pond

Shake

Mill

Cree k

Matsuda

 Res

PUGET 

 SOUND

E A S T PA S S A G E

COLVOS PASSAGE

m

hs

Qls

Qlsq

Qols

Qmw

Qbtf

Qbo

Qw

Qf

Qfo

Qa

Qoa

Qvr

Qvrl

Qvrc

Qvi

Qvt

Qva

Qvlc

Qpf

Qpfc

Qpff

Qpof

Qpog

Qpogt

Qpogf

Qpogc

Qpon

Qponf

Qpdc

Qwb

Qwbc

Qpdf

Qpdt

Qrm

Qvrls

Qf

CORRELATION OF MAP UNITS

 

125 ka*

135 ka*

150 ka*

225 ka*

18 ka*

70 ka*

774 ka**

* Ages from Booth and others (2004a)

** Age of Brunhes-Matuyama boundary from Sarna-Wojcicki and others (2000)

Holocene

QUATERNARY

Pleistocene

POSTGLACIAL DEPOSITS

YOUNGER GLACIAL DEPOSITS

OLDER GLACIAL AND NONGLACIAL DEPOSITS

 Qvt Qvr

Qva

m hs Qbtf Qbo

Qvlc

Qpof Qpog Qpon Qponf

 Qvi

Qpogt Qpogf

Qls Qlsq

Qols

Qmw Qw Qa

 Qvrc

Qpogc

Vashon stade

Fraser glaciation

Qfo Qoa

 Qvrl Qvrls

Qpf Qpfc Qpff

Qpdt

Qpdf

Qwb

Qwbc

Qrm

LIST OF MAP UNITS

POSTGLACIAL DEPOSITS

Modified land (Holocene)

Hard surface (Holocene)

Landslide deposits (Holocene)

Old landslide deposits (Holocene and Pleistocene)

Landslide deposits, questionable (Holocene)

Mass-wastage deposits (Holocene)

Wetland deposits (Holocene) 

Beach deposits and tidal flats (Holocene)

Beach deposits, old (Holocene) 

Fan deposits (Holocene)

Fan deposits, old (Holocene)

Alluvium (Holocene)

Older alluvium (Holocene and Pleistocene)

YOUNGER GLACIAL DEPOS1TS

 Deposits of Vashon stade of Fraser glaciation of Armstrong and 

 others (1965) (Pleistocene) 

Recessional outwash deposits

Outwash channels and deposits

Recessional lacustrine deposits

Sublacustrine landslide deposits

Ice-contact deposits

Till

Advance outwash deposits

Lawton Clay Member of the Vashon Drift

OLDER GLACIAL AND NONGLACIAL DEPOSITS

Deposits of pre-Fraser glaciation age (Pleistocene)

Coarse-grained facies

Fine-grained facies

Pre-Olympia deposits, fine-grained (Pleistocene)

Glacial deposits of pre-Olympia age (Pleistocene)

Till

Coarse-grained facies

Fine-grained facies

Nonglacial deposits of pre-Olympia age (Pleistocene)

Fine-grained facies

Possession Drift of Easterbrook and others (1967) (Pleistocene)

Till

Coarse-grained facies 

Fine-grained facies

Whidbey Formation (Pleistocene) 

Coarse-grained facies

Reversely magnetized deposits (Pleistocene)

Contact—Dashed where approximately located; dotted where 

concealed. Shown without contact where indefinate or gradational

Ordinary high-water limit

Approximate outer limit of tidal flat

Pre-Vashon till—Mapped within units Qpff, Qpon, Qpdt, Qpdc, and

Qwbc where exposed on valley walls or coastal bluffs

Probable fault—Identified on lidar DEM near Point Robinson. 

Dotted where covered

Block-slide slip plane—Dotted where covered

Block-slide, basal slip plane in Point Beals area—Dotted where 

covered

Parentheses—Indicates unit preserved in block slide

Strike and dip of bedding in fine-grained Quaternary deposits

Inclined

Horizontal

Paleomagnetic Direction—See table 2 (pamphlet) for data

Normal

Paleomagnetic direction and infrared-stimulated luminescence 

(IRSL) age locality—See tables 1 and 2 (pamphlet) for data

Exploration Sites

Field exposure

Probe—Various shallow soils evaluations; may include cone 

penetrometer test

Geotechnical boring

Geotechnical test pit

Monitoring or water well

Monitoring or water well on cross section—Vertical thin green 

lines show location of water wells. Labels above individual 

explorations on the cross section reference the appropriate 

Document ID number in the subsurface database of the Pacific 

Northwest Center for Geologic Mapping Studies at 

http://geomapnw.ess.washington.edu/index.php

Monitoring or water well—Wells from the Washington State 

Department of Ecology database that are located only to center of 

the quarter-quarter section. Data available as download at 

http://www.dnr.wa.gov/ResearchScience/Topics/GeosciencesData

/Pages/gis_data.aspx

DESCRIPTION OF MAP SYMBOLS

!

!

8

(Qvt)

WA-28

N37

63456

•

Qvi

63651

63654

63807

63661

63660

63695

63814

63068

63653

63648

63666&63812

63059

63060

63633

65069

63676

63057

65071

63641

63629

63384

63374

63432

63429

63474

63030

63393

63451

63447

63449

63456

63426

63435

63813

64107

Qvrc

Qva Qva

Qvt Qvt

Qvt

Qvt

Qvt Qvt

Qls

QvrQw Qf

Qw

Qvrl

Qa

Qa

Qls Qls Qvi Qvi

Qpff

Qpff Qpff Qpff Qpdt

Qvlc

Qpdt

Qpdc Qpdc

Qwbc

Qpff

Qva

Qva

Qva Qva

Qls

Qa

Qva

Qpdc Qvi

Qvi

Qponf

Qpdf Qpff

VASHON

HEIGHTS

PUGET SOUND

VERTICAL EXAGGERATION X5

Westside Highway SW

Mill Creek

SW 204th Street

Judd Creek

SW Cemetery Road

SW Bank Road

Vashon Highway SW

Qvi

Qvi

100

0

200

300

400

SOUTH

FEET

500

-200

-100

100

0

200

300

400

FEET

500

NORTH

-200

-100

Unit m not shown

BEND IN SECTION

Qpdf

Qvi Qvi

A A’