A L A S K A P E N I N S U

L A

S E W A R D

P E N I N S U L A

SAINT LAWRENCE

ISLAND

Saint Matthew

Island

PRIBILOF ISLANDS

Ku s k o k wi m

B a y

K O T Z E B U E

 

S O U N D

UMNAK ISLAND

UNALASKA ISLAND

Unga Island

Cook

Inlet

Amukta

Island

Yunaska

Island

Chuginadak

Island

Akutan

Island UNIMAK ISLAND

Sanak Islands

Pavlof Islands

B E R I N G

S

T

R

A

I

T

Hagemeister

Island

H a r r i s o n B a y

NUNIVAK

ISLAND

Iliamna Lak e

Shuyak Island

AFOGNAK

ISLAND

KODIAK

ISLAND

TRINITY ISLANDS

Barrow

Bethel

Dillingham

Homer

Kenai

Kodiak

Kotzebue

Nome

Point Hope

Unalaska

Y

U

K

O

N

R

I

V

E

R

Wales

Koyuk

Noatak

Ambler

Hughes Teller

Tanana

Nulato

Kaltag

Willow

Tyonek

Naknek

Selawik Bettles

Nikolai

Chignik

Seldovia

Talkeetna

Sleetmute

Unalakleet

False Pass

Saint George

Russian Mission

Ruby

Kobuk

Togiak

McGrath

Holy Cross

Goodnews Bay

White Mountain

Agripina Bay

Cape Current

Cape Deceit

Cape Dyer

Cape Lisburne

Cape 

Newenham

Cape Thompson

Chinitna Bay

Harris Bay

Hooper Bay

KENAI

PENINSULA

Kulukak Bay

Narrow

Cape

Norton Bay

Nushagak Bay

Kvichak Bay

Point

Bede

Port Moller

Puale Bay

Becharof Lake

Turnagain Arm

Knik Arm

West

Foreland

Smith Bay

Dease Inlet

Admiralty

Bay

C H U K C H I

S E A

Peard Bay

Selawik Lake

Eschscholtz Bay

Spafarief Bay

Goodhope Bay

Little Diomede

Island

Sishmaref Inlet

Pastol Bay

K U S K O K W I M

R I V E R

Scammon Bay

Hazen Bay

Baird Inlet

Etolin Strait

Port

Heiden

Bechevin Bay

Un ima k

Pa ss

Umnak Pass

F O X I S L A N D S

Samalga Pass

ISLANDS OF FOUR MOUNTAINS

Inanudak Bay

Makushin Bay

Akutan Bay

Morzhovi Bay

Cold

Bay

Shumagin Islands

Stepovak Bay

Kujulik Bay

Aniakchak Bay

Chiginagak Bay

SHELIKOF STRAIT

Wide Bay

Alitak Bay

Ugak Bay

Kiliuda Bay

Chiniak

Bay

Marmot Bay

Stevenson Entrance

Kennedy Entrance

Barren Islands

Chugach Islands

Augustine

Island

Kamishak Bay

Kachemak Bay

Nuka Bay

Teshekpuk

Lake

Parks Highway

Sand Point

Saint Paul

King Cove

King Salmon

American Bay

Cape

Douglas

Cape Igvak

Cathedral River

Rampart

Chikuminuk

Lake

Nuyakuk Lake

Deer Island

Devils Bay

Mitrofania

Island

Katmai Bay

Kurupa Hills

Lake Chauekuktuli

Iliamna

Sitkalidak

Island

Sitkinak

Island

Upnuk

Lake

Uyak Bay

Yenlo

Hills

Tustumena Lake

King

Island

Gambell

Savoonga

Scammon Bay

Hooper Bay

Sanak Island

Ocean

Point

Colville

River

SAINT MICHAEL

ISLAND

TAYLOR MOUNTAINS

B O R D E R R A N G E S

F A

U

L T

KOYUKUK R IVER

Kobuk River

No

ata

k

River

Nushaga k River

Mulchatn a River

Kvichak

River

Susitna River

Yentna River

B R I S T O L B A Y

B E R I N G

S E A

N O R T O N S O U N D

PA C I F I C O C E A N

DZwp

KJgu

Degh

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Thi

Tsmo

Tpgi

Thi

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Tv

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KJgu

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Tvme Jsct

Kvgc

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JPk

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Ksmd

TKgi

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TKgi

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Kk

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QTvi

TKgi

TKgi

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KJgn

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KJab TKpr

TKm

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Ksmd Dwbl

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Kk

Knmt DZwp

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QTvi

Ksmd

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Kvs

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KJvp Dwbl JPk KJab

Kvs

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TKgi

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Kcca KJvp

TKpr

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Klgr Klgr

Kk

TKgi

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TKgi

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TKpr

TKgi

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TKgi

KJab

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Kcgc KJab

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TKgi

Swbc

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TKpr

KMm

TKgi

TKpr

Kfy

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TKpr

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QTvi

KMm

QTvi TKgi

Knmt

Kfy

KJab KJab

Knmt

Kfy

Kk

Kk JDmc

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Ti

Xio

TKpr

Dtz

Dtz

JZu

Ksmd KJvp KJvp

Tv Toeg

KMm

TKpr

Kk

TKgi

TKgi Jc

rqm

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Kvgc Dsp

TKgi

Tvme

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Ti

wn

KJab

JMct

KJvp bu Oc

TKpr

Tv Dwbl Knmt

TKm

Toeg

Kcgc

Kyg

TKpr

Knmt KJvp

Tng

Kms

Kcgc

TKpr

Knmt

Dsp

TKpr

TKpr

TKgi

Ksmd

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TKpr

JDmc

TKgi

sf

TKgi

JMct

Kcca

Kvgc

KJab

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MDmg

JDoc

Toeg

rqm

Tv QTvi KMm Kk

wn

JZu

JDoc

Dwbl

Tng

TKpr

Tcb

JMct

Oc

TKpr

Knmt

Knmt

Dsp

Dwbl

Jlmgr

qm

Dbg

TKpr

Clgtk Kmgr

DZwp

kn

JZu

MDts

Oc

Dtz

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Clgtk

DZwp

Dtz

TKpr

Je

TKgi

JZu

KJab

JZu

TKpr Oc

Tv

KJab

JDoc

Keg

KJab

Knmt

Tvme

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JZu

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DZyf

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JDoc

Dtz TKgi

Tv

TKgi

Swbc

Dtz

Dbg

TKpr wn

DZyf

Kcgc

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QTvi

Kmgr

rqm

Kkg

KJab

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kg

bu

JDoc

JZu

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Kmgr

rqm

kg

TKgi

Kmss

Kmss

DSsm

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Kipc

JDoc

Kmig

Dmt

Oc

Knmt

Dtz

nc

Dmt

DSsm

Kyg

TKgi

nc

Mgq

KJab

Knmt Tcb

mb

Ti

Dtz

MDmg

Kkg

TKpr DZyf

JDoc

TKgi

nc

Zncl

Zncl

Kmgr

nc

JDoc

mb

Zgn

Kmgr

Klgr

Oc

Zncl

Klgr

TKgi

KJab

kg

Ti

wn

KJab

Tvc

Kipc

nc

Dtz

Tcb

Kmgr

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Knmt

rqm

Kyg

Kmgr

Klgr

JDoc

QTvi

Kmgr

Tv

Dtz

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nc

Klgr

Knmt

kg

Klgr

mb

Knmt

Kcgc

KJab

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nc

MDmg Opt

Jlmgr

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Knmt

np

Kcvg

KJgu

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TKpr

KJab

Kcca

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Kyg

Knmt

nc

Kmgr

mb MDmg

QTvi

Kmgr KMm

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mb

JDoc

QTvi Kipc

gp

KJab

DZyk

DZyk TKs

Kmgr

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Kmgr

nc

Klgr Kvgc

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Knmt

Klgr

Kms

QTvi

Clgtk Klgr

JZu

JDoc

QTvi

mb Opt

Kmgr

Zncl

Zncl

KJab

nc

KJab

Opt

Kcvg

KJab

Dmt

Kmgr

Kvu

kg

Klgr

Kmgr

Kvgc

Klgr

MDmg

Zncl

rqm

Kvu

Kmgr

Kmgr

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Kmgr

KJab

KJab

TKpr

Kcgc

Kcgc

Kmgr

Kcgc

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KJab

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KMm

Kipc

Kcgc

JDoc

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JDoc

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Kipc

Knmt

Knmt

Kipc

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Kcvg KMm mb Mgq

Knmt

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Knmt

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Kmgr

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mb

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Das

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KMm

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Dbf

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Dbf

Dbf

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JDoc

Dbf

Degh

Dnl Degh

Dcn

Dcn

Mk

KMm

Dsb MDmg

Dcn

Dcn

Mk

Khs

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Degh Dnl

Clg

MDe

MDe

bu

c

Kok Clgtk

Dbf

Dbf

Degh

Clg

Dsb

Dsb

Dsb

Mk

Degh

Dbf

Dbf

Dnl

c c MDe

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Dbf

Dbf

MDegk

Dbf

Mk

bu

Dbg

Dbg

Dbg

Sda

MDe

DOtu

Degh

Degh

Js

Degn

Clgtk

Mk

Degn

Clg

MDegk

bu

MDegk

Degh Degn

Dbf

MDe

Clg

JZu

MDegk

Kok

Dbg MDe

Degn Degh

Clgtk

JZu

Degh

Degh

Mlgac

Mlgk

KPss

Mlgac

bu

Mk

MDegk

Clgtk

Mk

MDegk

Clg

MDegk Dbg

bu

MDegk

Je

MDegk

Mk MDegk

Mlgk

Degn

Mk

Je

Kok

JZu

Clg

Clg

Je

Clg

JZu Mk Kok

Clg Kok

Mlgac

Mlgnu

Mk

Mlgk

Kok

Je

Mlgac

Clgtk

Kns

bu

Mlgac

JZu

Je

Je

JZu

bu

Clg Mlgac

Mlgk

Kns

Kns

Kok

Mk

gs

Mlgk

Clgtk

Je

Kcca

Kns

Mn

Mlgnu Mlgnu

Kok

Kns

bu

Mlgac

KPss

Je

Clgtk Mn

Je

Kok Kok Ksb

Knmt

Knmt

Kns

Kcca

MDe

Ksbf

Ksbf

SOig

Knmt

KPss

Kok

TKpc

gs

Clg

Knmt

Ksb

Ksbf

Ksbf Ksb

Knmt

Kns

Kns

Tsf

Tsu

TKpc

Knmt Kns

Tsf

Kns

Kns

bu

Kns

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

ATTU ISLAND

AGATTU

ISLAND

Shemya

Island

N

E

A

R

 

I S L A N D S

Agattu Strait

P A C I F I C

O C E A N

TKkf

T}u

Tgb

QTvi

Tsmo

bu

QTvi

QTs

Tsmo

Tbk

T}u

174°

174°

53°

52°

Figure 2. Map showing geographic regions of Alaska, including two-letter abbreviations (in parentheses) included in the List of Map Units that are used to locate map units.

120°

135°

135°

150°

150°

165°

165°

180°

165° 180°

66°

62°

62°

58°

58°

54°

54°

50°

Northwest Northeast

Westcentral

Seward 

Peninsula

Eastcentral

Southwest

Southeast

A

l

e u t i a n I s l a n d s

NORTHERN

CENTRAL

SOUTHERN

South-central(SC)

(NR)

(CN)

(SO)

(NW)

(SP)

(WC)

(SW)

(NE)

(EC)

(SE)

(AL)

Alaska

Peninsula (AP)

Figure 1. Map showing 1:250,000-scale quadrangles (153) that cover Alaska and map areas on sheets 1 and 2.

ATTU

RAT

ISLANDS

ADAK

ATKA

SEGUAM

GARELOI

KISKA ISLAND

174°

174°

177°

177°

180°

180°

177°

177°

174°

174°

53°

52°

52°

51°

51°

BARTER

ISLAND

FLAXMAN

ISLAND

WAINWRIGHT

BEECHEY

POINT

MEADE

RIVER HARRISON

BAY

TESHEKPUK

DEMARCATION

POINT

POINT

LAY

MT

MICHELSON

UTUKOK

RIVER SAGAVANIRKTOK

LOOKOUT

RIDGE UMIAT

IKPIKPUK

POINT RIVER

HOPE

TABLE

MTN

DE LONG

MTS

ARCTIC

MISHEGUK

MTN PHILIP

SMITH MTS

HOWARD

PASS CHANDLER

LAKE

KILLIK

RIVER

COLEEN

NOATAK

CHRISTIAN

BAIRD

MTS

CHANDALAR

AMBLER

RIVER WISEMAN

SURVEY

PASS SHISHMAREF

BLACK

RIVER

KOTZEBUE

FORT

YUKON

SELAWIK

BEAVER SHUNGNAK HUGHES BETTLES TELLER

CHARLEY

RIVER

BENDELEBEN

CIRCLE

CANDLE

LIVENGOOD

KATEEL

RIVER MELOZITNA TANANA NOME

EAGLE

SOLOMON

BIG

DELTA

NORTON

BAY

FAIRBANKS

NULATO KANTISHNA

RIVER

RUBY

ST

LAWRENCE

TANACROSS

ST

MICHAEL

MT

HAYES

UNALAKLEET

HEALY

OPHIR ME DENALI DFRA BLACK

NABESNA

KWIGUK

GULKANA

HOLY

CROSS TALKEETNA

MTS

IDITAROD MCGRATH TALKEETNA HOOPER

BAY

MCCARTHY

ST

MATTHEW MARSHALL

VALDEZ

RUSSIAN

MISSION

ANCHORAGE

SLEETMUTE

TYONEK

LIME

HILLS

MT ST

ELIAS

ATLIN

NUNIVAK

ISLAND

BERING

GLACIER

BAIRD

INLET

CORDOVA

SKAGWAY

BETHEL

SEWARD

TAYLOR

MTS KENAI

LAKE

CLARK

YAKUTAT

TAKU

RIVER

CAPE

MENDENHALL

ICY

BAY

JUNEAU

KUSKOKWIM

BAY

MIDDLETON

ISLAND

MT

FAIRWEATHER

GOODNEWS

BAY BLYING

SOUND

DILLINGHAM ILIAMNA SELDOVIA

SUMDUM

SITKA

BRADFIELD

CANAL

HAGEMEISTER

ISLAND NUSHAGAK

BAY NAKNEK AFOGNAK

MT

KATMAI

PETERSBURG PORT

ALEXANDER

PRIBILOF

ISLANDS

KETCHIKAN

BRISTOL

BAY UGASHIK

CRAIG

KARLUK KODIAK

PRINCE

RUPERT

CHIGNIK

DIXON

ENTRANCE

SUTWIK

ISLAND TRINITY

ISLANDS KAGUYAK

COLD

BAY PORT

MOLLER STEPOVAK

BAY

UNIMAK FALSE

PASS SIMEONOF

ISLAND

UMNAK UNALASKA

AMUKTA

SAMALGA

ISLAND

BARROW

123°

132°

132°

141°

141°

150°

150°

159°

159°

168°

174° 177° 168°

66°

66°

62°

62°

58°

58°

54°

54°

PA C I F I C

OCEAN

PA C I F I C

OCEAN

SHEET 1 SHEET 2

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

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://dx.doi.org/10.3133/sim3340

Suggested citation: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M, comps., 2015, 

Geologic map of Alaska: U.S. Geological Survey Scientific Investigations Map 3340, 

pamphlet 197 p., 2 sheets, scale 1:1,584,000, http://dx.doi.org/10.3133/sim3340.

ISSN 2329-132X (online)

http://dx.doi.org/10.3133/sim3340

ISSN 2329-1311 (print) 1

U.S. Geological Survey;

2

National Park Service;

3

C.G. Mull Technical Services

Geologic Map of Alaska

Compiled By

Frederic H. Wilson1, Chad P. Hults2, Charles G. Mull3, and Susan M. Karl1

2015

ALASKA

MAP LOCATION

CANADA

RUSSIA

OCEAN

PA C I F I C

NORTH AMERICAN VERTICAL DATUM OF 1988

50 0 50 100 150 MILES

50 0 50 100 150 KILOMETERS

See Guide to the Digital Database Files (readme file), SCALE 1:1 584 000

Spatial Datasets section, for geographic sources

No suitable topographic base is available or could be 

created within the scope of this project. Shaded-relief 

bases were not appropriate, because they obscured the 

geologic mapping

Alaska Albers Equal Area projection; North American 

Datum 1983 (NAD–83)

Detailed mapping credit is in nsarefs in database

Digital database by F.H. Wilson, Nora Shew, Keith Labay, 

and C.P. Hults

Cartographic design by Keith Labay

Digital cartographic production by Kathryn Nimz

Edited by C.M. Landowski and J.L. Zigler 

Manuscript approved for publication August 13, 2015

168°00'

52°00'

172°00'

172°00'

52°00'

53°00'

168°00'

54°15'

164°00'

56°00'

164°00'

160°40'

57°00'

159°00'

54°00'

151°30'

58°00'

155°30'

55°45'

162°30'

58°00'

168°00'

59°00'

61°00'

168°00'

63°00'

169°00'

65°00'

168°00'

67°00'

168°00'

69°00'

163°00'

71°00'

157°30'

72°00'

154°30'

72°00'

153°00'

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3340

Sheet 1 of 2

Pamphlet accompanies map