McNeil Lake

Gibraltar Lake

Kakhonak

Lake

Meadow Lake

Moose

Lake

Battle Lake

Caribou Lake

Bradley

 Lake

Elephant

 Lake

Seven

Lakes

Grebe

Lake

Browns

Lake

S k i l a k L a k e

Hidden Lake

T u s t u m e n a

L

a k

e

Glacier

 Lake

K u l i k

L a k e

Cres cent Lake

I L I A M N A

L A K E

Cooper

Lake

K

e

n

a i

L a k e

Crescent

Lake

Up per

Trail L

Copper

River

Pile

Riv er

Iliamna

River

Fox

River

Drift

River

Crescent

River

Tuxedni

River

Kenai

River

Skilak

River

Kasilof

River

Ninilchik

River

Killey

River

Kenai

River

S a v o n o s k i R i v e r

R

a i n

b

o

w R

i

v

e

r

South

Fork

K

a

m

i

s

h

a

k

R

i

v

e

r

Ninagiak

River

Resurrection River

Quartz

Creek

Juneau Cr

Kenai River

Cynthia Falls

Tuxedni Bay

Squarehead

 Cove

Snug Harbor

Oldmans

 Bay

Cobbs

Cove

Doroshin Bay

Nikolai

 Bay

Big Bay

Devils Bay

R

e

d

o

u

b

t

B

a y

C

o

o

k

I

n

l

e

t

K a m i s h a k

 B a y

Amakdedulia Cove

Rocky Cove

Bruin

Bay

Dry Bay

I n

i

s

k

i

n

B

a

y

Iliamna

Bay

Cottonwood Bay

Right Arm

U r s u s C o v e

Lonesome Bay

Pedro

Bay

C h i n i t n a B a y

C

o

o

k

I

n

l

e

t

Akumwarvik Bay

Pinkidutia Cove

Horseshoe Cove

Oil Bay

Clam Cove Herbs

Lagoon

Chinitna

Bay

C

o

o

k

I

n

l

e

t

Swikshak

Lagoon

McNeil

 Cove

Akjemguiga Cove

Sukoi Bay

Port Graham

Coal Cove

Kasitsna

 Bay

Seldovia

Bay

Jakolof

 Bay

Little Tutka

Bay

Tutka

Bay

Sadie Cove

China Poot Bay

Peterson Bay

Neptune

 Bay

Halibut

Cove

Mallard Bay

Coal Bay

Bear Cove

K a c h e m a k

B a y

English Bay

Andreon Bay

Shangin Bay

Wonder Bay

G

u

l f

o

f

A

l

a

s

k

a

Neketa Bay

Western Inlet

Big

Bay

Carry 

Inlet

Chrome Bay

Chugach Bay

Windy Bay

Rocky Bay

Picnic

 Harbor

West

Arm

Port Chatham

Koyuktolik Bay

Sid Larson Bay

S h el i k o f S t r a i t

Dark Passage

S t e v e n s o n

E n t r a n c e

Big Chutes

Chugach Passage

Eldred Passage

Tuxedni Channel

K e n n e d y E n t r a n c e

Caribou

Islands

Caribou Island

A l a s k a P e n i n s u l a

K e n a i

P e n i n s u l a

Shakun

 Islets

Shakun Rock

Kiukpalik

 Island

Ushagat

 Island

West Amatuli

 Island

East Amatuli

 Island

Sud I

B a r r e n I s l a n d s

Nord I

S h u y a k

I s l a n d

Augustine Island

Shaw I

Nordyke I

Vert I

Iniskin I

Pomeroy I

Scott

 I

Porcupine I

Perl Island

C h u g a c h

I s l a n d s

Passage I

Flat Islands

Yukon

Island

Hesketh

Island

Cohen

Island

Herring Is

Ismailof

 Island

Bear

Island

Chugachik

Island

Gull Island

Magnetic

 Island

Chisik Island

Duck Island

Kalgin Island

East Chugach

 Island

Elizabeth

 Island

Lucas

Island

Oil Point

Camp Pt

Seal Spit

I n i s

k i n

P e

n i n s u l a

Sea Otter

 Pt

Chinitna

Point

Anchor Point

Cape Starichkof

Spring Point

Harriet Point

Redoubt Point

Fossil

Point

Iliamna Point

Light Point

Northwest Point

Cape Kasilof

Cape Ninilchik

Pt. Banks Carshan Pt.

Party Cape

Eagle Cape

Cape Newland

Cape

Douglas

Cape

Chiniak

Burr Point

Tignagvik Point

McNeil Head

Chenik Head

Squirrel

Point

Lonesome

Pt

Cape Elizabeth

Point Adam

Point Bede

Russian Point

Point Pogibshi

Dangerous Cape

Barabara Point Nubble Point

Seldovia Point

Point Nashowhak

Anisom Point

Coal Point Peterson

 Pt

South Head

Ursus

Head

Contact Point

McKeon

Flats

Back Range

Havenstrite Ridge

C r o s s m a n R i d g e

D i a m o n d R i d g e

B

O

R

D

E R

R

A

N

G

E

S

F

A

U

L

T

E

A

G L E

R I V

E

R

F A U L T

B R U I N

B A Y

F A U

L T

B

R

U

I

N

B

A

Y

F

A

U

L T

B

O

R

D

E

R

R

A

N

G

E

S

F

A

U

L

T

Salamatof Beach

Kalifornsky Beach

Kaguyak Crater

Resurrection

 Pass

Devils Pass

Johnson Cr

 Summit

Moose Pass

Portage

Pass

Lake Clark

Pass

Gladiator Basin

Kenai River Canyon

Fourpeaked Glacier

Spotted

Glacier

Red Glacier

Tux

e

dni Gla

c

ier

Tongue Glacier

Chernof Glacier

Dinglestadt Gl.

Skilak Glacier

T u s t u m e n a G l a c i e r

Yalik

Gl.

Portlock Gl.

Dixon

Glacier

Grewingk Glacier

HARDING

 ICEFIELD

Augustine

Volcano

Badger

Hill

Bald

Mountain

Bear

Mountain

Mount

Bede

Big Hill

Brown

Mountain

Brown

Peak

Cecil

Rhode

Mountain

Chenik

Mountain

Mount

Chinitna

Cone

Mountain

Cooper

Mountain

Mount

Douglas

Mount

Eleanor

Epperson

Knob

Fourpeaked

Mountain

Front

Mountain

Gilpatrick

Mountain

Hideout

Hill

Horn

Mountain

Iceworm

Peak

Iliamna

Volcano

Langille

Mountain

Lookout

Mountain

Middle

Mountain

Mount

Mills

Mount

Nick

Ninilchik

Dome

North

Twin

Ohlson

Mountain

Pedro

Mountain

Pfaff

Peak

Pilot

Knob

Mount

Pomeroy

Ptarmigan

Head

Puffin

Peak

Red

Mountain

Redoubt

Volcano

Right

Mountain

Rock

Mountain

Roscoe

Peak

Round

Mountain

Russian

Mountain

Rusty

Mountain

Saddle

Mountain

Seven

Sisters

Slope

Mountain

South

Chinitna

Mountain

South

Twin

Step

Mountain

Sugarloaf

Mountain

Table

Mountain

The Cone

Three

Sisters

Mountain

Tonnie

Peak

Triangle

Peak

Truuli

Peak

Wrong

Mountain

Salamatof

Nikiski

Seward

Homer

Kenai

Soldotna

Nondalton

Iliamna

Port

Alsworth

Newhalen

Kachemak

Kokhanok

Pedro Bay

Nikolaevsk

Nanwalek

Portlock

Moose

Pass Cooper

Landing

Seldovia

Port

Graham

Anchor

Point

Ninilchik

Clam

Gulch

Kasilof

Silver Salmon Cr.

K a t c h i n Cr.

Homer Spit

 PRINCE

WILLIAM

 SOUND

COOK INLET

 Kenai

 Fjords 

 National 

Park

Lake Clark

National Park

and Preserve

Katmai

National Park &

Preserve

Denali

National Park

and Preserve

156° 153° 150° 147°

154° 151°30’

62°

61°

60°

59°

Kenai Peninsula

ALEUTIAN RANGE

Alaska Peninsula

ALASKA RANGE

TORDRILLO

MOUNTAINS

TALKEETNA

MOUNTAINS

AREA OF

MAP

KENAI MOUNTAINS

CHUGACH

MOUNTAINS

Afognak Is.

Augustine Is.

Anchorage

GEOGRAPHIC INDEX MAP

ALASKA

MAP LOCATION

KENAI

ILIAMNA

TYONEK

SEWARD

SELDOVIA

LIME HILLS

MCGRATH

LAKE CLARK

AFOGNAK

TALKEETNA

ANCHORAGE

BLYING SOUND

MT KATMAI

TALKEETNA MTS

60°39’

153° 150° 147°

154° 151°30’

156°

62°

61°

60°

59°

SHEET 1

SHEET 2

INDEX MAP SHOWING 1:250,000-SCALE QUADRANGLES IN MAP AREA 

(SHADED) AND AREAS OF MAP SHEETS 1 AND 2.

18°

MAGNETIC NORTH

TRUE NORTH

APPROXIMATE MEAN

DECLINATION, 2012

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Jtk

Qat

Qb

Jn

Qm

Qaf

Qaf

Tpg

Qm

Khe

Qsl

Jnn

Jnn Jnn

Qv

Jnst

Qhv

Jnst

Qm

Jn

Khe

Khe

Qm

Tpi

Qhg

Tpi

Qv

Tpi

Tpi

Qv

Qat

Qgo

Qm

Jni

Jni

Jni

qd

vm

Kcc

Qaf

Qho

Qgo

Qat

Qaf

Qaf Tks

Tkn

Qgo

KMm

Kvm

KMm

KMms

KJms

KMm

KJms

Kmc

Kmc

Kmc

KJms

Tks

Tkb

Tkb

Qm

Qm

Tks

Qge

Qge

Tkb

Kmc

Tkt

KMm

KJms

g

KJms

Qat

u

Tkt

Tkt

Tkt

Qs

Qb

u

Kmc

qd

Kvm Kvm

Tmf

Qb

Qb

KMm

Qlc

Qhg

Qaf

Qhg

Qhg

Qm

Qm

Tpgr

bu

bu

Qhg

Qhg

Qlc

Qtf

Qs

Qat Qlc

Qb Qsl

Qes Qgl QhgQhg Qho

Qm Qgo

Qig Qog

Qdl

Tkn Tkb

Tks

Tkh

Tkt

Twf

Ksm

Tcl

Kvgs Kvm

KMm

KJms

g u Kmc

Jnp

Jnst

Jnn

Jnc

Jcp

Jct

Jtb

Jtt

Jtc

Jtf

Jtg

Jtk

Jtkh

Jtkp

Jtkm

pg

Jp

Jsch

JPk

Qv

Tb

TKv

Thg

TKgd

TKd

Jtr

Jqd

qd

Jtrg

Qdf

Tvs

Tts

Tw

Kvs

KJs

Tar

Tch

Kkg

Ksf

Kes

Kkd

Km

Kcc

Khe

Jn

Jnk

Jni

Jc

Jlm

kb sv

ss ku

km

vs

Qvd Qhv

Qad

QTv

Tvu

Tpg

Tmv Tmb

Tmf

Tpv

Kv

Ti

Tpi

Toegr

Tgn

Tpgr Tgd Tpd

TKg TKgb

Kgr Kogr

Kgd Kqd Kqms

Klt

Kum

KJq

Jqm Jmu

Jeqd Jum

vm c

n

TKc TKgg

Kivs

Kps

JPam

Jpmu

JPmb

Tsu

m

Kyh

Tfv Tem

TKft

Qd Qgc Qgm Qge

Qaf

Qbc

Jt

Kvv

CORRELATION OF MAP UNITS

UNCONSOLIDATED DEPOSITS

SEDIMENTARY ROCKS

VOLCANIC AND HYPABYSSAL ROCKS PLUTONIC ROCKS

IGNEOUS ROCKS MÉLANGE AND METAMORPHIC ROCKS

QUATERNARY

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC

PERMIAN

CARBONIFEROUS

Holocene

Pleistocene

Pliocene

Miocene

Oligocene

Eocene

Paleocene

Holocene

Pleistocene

Upper

Lower

Upper

Lower

Middle

Upper

Middle

Lower

?

?

?

? ?

?

?

?

?

?

?

?

?

?

?

?

?

?

? ? ?

?

?

?

?

?

?

?

?

?

? ?

KENAI GROUP

ALASKA-ALEUTIAN RANGE

BATHOLITH (JURASSIC PHASE)

PLUTONS PROXIMAL TO THE

BORDER RANGES FAULT

?

?

?

?

?

? ?

?

Shuyak

Fm.

Kamishak

Fm.

?

?

?

?

?

?

Naknek Fm.

Chinitna Fm.

Tuxedni Group

Talkeetna

Fm.

VALDEZ GROUP MCHUGH AND UYAK COMPLEXES

SOURCES OF GEOLOGIC MAPPING

[For specific locations of map source contributions 

refer to: http://pubs.usgs.gov/of/2009/1108/]

TALKEETNA QUADRANGLE

Reed and Nelson, 1980

Reger, 1977

Weber, 1961

Wilson and others, 1998

Wilson, F.H., and Hults, C.P., unpub. data, 2008

TALKEETNA MOUNTAINS QUADRANGLE

Csejtey and others, 1978

Reger, 1977

Schmidt, J.M., unpub. data, 2008

Wilson, F.H., and Hults, C.P., unpub. data, 2008

TYONEK QUADRANGLE

Bundtzen and Jorgenson, 2005

Detterman and others, 1974

Haeussler P.J., and Milholland, Madeline,unpub. 

data, 2008

Haeussler, P.J., unpub. data, 2008

Haeussler, P.J., and Saltus, R.W., unpub. data, 2008

Karlstrom, 1964

Reed and Elliott, 1970

Reger, 1977

Schmoll, H.R., and Yehle, L.A., unpub. data, 2008

Solie and others, 1991

Weber, 1961

Wilson, F.H., and Hults, C.P., unpub. data, 2008

ANCHORAGE QUADRANGLE

Detterman and others, 1974

Detterman and others, 1976

Haeussler, 1998

Haeussler, P.J., and Saltus, R.W., unpub. data, 2008

Reger, 1977

Schmoll, H.R., and Yehle, L.A., unpub. data, 2008

Winkler, 1992

Wilson, F.H., and Hults, C.P., unpub. data, 2008

LAKE CLARK QUADRANGLE

Detterman and Hartsock, 1966

Eakins and others, 1978

Nelson and others, 1983

Reed and others, 1983

Waythomas and Miller, 1999

Wilson and others, 2006

KENAI QUADRANGLE

Bradley and Wilson, 2000

Detterman and Hartsock, 1966

Haeussler, P.J., and Saltus, R.W., unpub. data, 2008

Karlstrom, 1964

Magoon and others, 1976

Reed and others, 1992

Reed and others, 1983

Riehle and Emmel, 1980

Waythomas and Miller, 1999

Wilson and others, 2006

Wilson, F.H., and Hults, C.P., unpub. data, 2008

SEWARD QUADRANGLE

Nelson and others, 1985

Tysdal and Case, 1979

Wilson, F.H., and Hults, C.P., unpub. data, 2008

ILIAMNA QUADRANGLE

Detterman and Hartsock, 1966

Detterman and Reed, 1973

Detterman and Reed, 1980

Fisher and Magoon, 1978

Waythomas and Miller, 1999

Wilson and others, 2006

Wilson, F.H., unpub. data, 2008

SELDOVIA QUADRANGLE

Bradley and others, 1999

Bradley, oral commun., 2007

Detterman and Hartsock, 1966

Fisher and Magoon, 1978

Haeussler, P.J., and Saltus, R.W., unpub. data, 2008

Karlstrom, 1964

Magoon and others, 1976

Wilson, F.H., and Hults, C.P., unpub. data, 2008

MOUNT KATMAI QUADRANGLE

Riehle and others, 1987

Riehle and Detterman, 1993

Wilson and others, 1999

Wilson, F.H., unpub. data, 2008

AFOGNAK QUADRANGLE

Connelly and Moore, 1979

Fisher and Magoon, 1978

Magoon and others, 1976

Riehle and Detterman, 1993

Riehle and others, 1993

Wilson and others, 1999

Wilson, F.H., unpub. data, 2008

Scientific Investigations Map 3153

Sheet 2 of 2

Pamphlet accompanies map

Geologic Map of the Cook Inlet Region, Alaska

Including parts of the Talkeetna, Talkeetna Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Iliamna,

Seldovia, Mount Katmai, and Afognak 1:250,000-scale Quadrangles

Compiled by

Frederic H. Wilson, Chad P. Hults, Henry R. Schmoll, Peter J. Haeussler, Jeanine M. Schmidt, Lynn A. Yehle, and Keith A. Labay

2012

U.S. Department of the Interior

U.S. Geological Survey

60°39' 153°00'

60°39'

60°00'

59°00'

59°00'

60°00'

154°00'

58°30'

58°30'

155°00'

151°30'

SCALE 1: 250 000

5 0 5 10 15 20 25 KILOMETERS

5 0 5 10 15 20 MILES

Hydrolographic information derived from USGS 1:63,360 scale DLG data

Shaded relief derived from USGS 2 arc second NED data

Shaded bathymetry derived from NOAA National Geophysical Data Center data

Alaska Albers Equal Area projection; North American Datum 1927

150°00'

150°00'

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://pubs.usgs.gov/sim/3153/

Suggested citation: Wilson, F.H., Schmoll, H.R., Haeussler, P.J., Schmidt, J.M., Yehle, L.A., and Labay, K.A., 

compilers, 2012, Geologic map of the Cook Inlet Region, Alaska including parts of the Talkeetna, Talkeetna 

Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Iliamna, Seldovia, Mount Katmai, and Afognak 

1:250,000-scale Quadrangles: U.S. Geological Survey Scientific Investigations Map 3153, pamphlet 76 p., 2 

sheets, scale 1:250,000. (Available at http://pubs.usgs.gov/sim/3153/.) Printed on recycled paper

Prepared in cooperation with the

Alaska Department of Naural Resources Division of Oil and Gas

Roof pendants of the Kakhonak Complex intruded by plutons of the 

Alaska-Aleutian Range Batholith. (photograph by Chad Hults)

Contorted chert beds of the McHugh Complex mélange on Yukon Island in 

Kachemak Bay. (photograph by Chad Hults)

Contorted chert beds of the McHugh Complex mélange in Kachemak Bay. 

(photograph by Chad Hults)

Augustine Volcano during the 2006 eruption. (photograph by Chad Hults)