Swan

Lake

Larson

Lake

Amber Lake

Rockys Lakes

Shulin Lake

Barbara

 Lake

Grouse

Lake

King

Lake

Sportfish

 Lake

McLain

Lake

Gooseneck

 Lake

Bill Besser

Lake

Snag

 Lake

Swan Lake Bear Lake

Beaver

 Lake

Red Shirt

 Lake

Trapper

Lake

Alexander

 Lake

Flat Horn

 Lake

Figure

Eight

Lake

Coal Creek

 Lake

Strandline Lake

Chakachamna

Lake

Kenibuna

 Lake

Blockade Lake

Big

Lake

Lower

Lake George

Iron Creek

Ta l k e e t n a

R i v e r

S h e e p R i v e r

Goose Creek

Kashwitna

River

Purches Creek

Peters

Creek

Little

Willow

Creek

Willow

Creek

Kashwitna

River

Moose

Creek

Granite Creek

Carbon Creek

Kings

River

Chickaloon

River

Boulder

Creek

Coal

Creek

Wolverine Creek

Metal Creek

Hunter

Creek

Lake Fork

Glacier

Fork

Lucile

Creek

Cottonwood

Creek

K n i k R i v e r

Friday

Creek

Thunder Bird

Creek

Eklutna

River

Goat

Creek

Peters

Cree

M

k

eadow Cr

Ship

Creek

Goose

Creek

Campbell

Cr

Rabbit Creek

Wasilla

Creek

M a t a n u s k a

R i v e r

Bird

Creek

Eagle

River

South

Fork

Twentymile

River

Resurrection

C reek

Sixmile

Creek

Little

Susitna

River

Little Susitna

River

Port of Anchorage

Upper Lake George

Eklutna

Lake

S

u

s

i

t

n

a

R

i

v

e

r

E

a s t F

o r k

Y

e

n t n

a

R i v e r

K

a

h i l t n

a

R

i

v

e

r

Y e

n

t

n

a

R

i

v

e

r

Kustatan

River

McArthur

River

Big

River

Swanson

River

Chickaloon

River

Kahiltna

River

Y e n t n a

R

i

v

e

r

Beluga

River

Chuitna

River

Chakachatna

River

Tala

c

h

ulitna

River

S k w e n t n a

R i v e r

H a y e s

R i v e r

Trimble

River

S k w

e

n

t n

a

R i v

e

r

Little

Susitna

Riv

er

Chichantna River

McArthur

River

S u

s

i t n

a

 

R i v

e

r

Thunder Bird

Falls

Sixmile Lake

Eagle Ba

K

y

n

i k

A r m

Goose Bay

T u r n a g a i n

A r m

Nikiski Bay

Number Three Bay

C h i c k a l o o n B a y

Shelter

 Bay

K n i k A r m

C o o k

I n l e t

Trading

 Bay

Beshta Bay

T

r

a

d

i

n

g

B

a y

G o m p e r t z C h a n n e l

Beluga

 Lake

Chelatna Lake

Colony Pt

Cairn

Point

Point

McKenzie

Wolf

Point

Gull Rock

Windy Pt

Bird Pt

Snipers

Point

Duck Flats

Cottonwood Beach

Fish Lakes

Delta Islands

Wolf Lakes

Trinity Lakes

Chedatna Lakes

Swanson Lakes

Meadow Lakes

Beaver Lakes

Elmendorf Moraine

Bald Mtn Ridge

Arkose Ridge

A n t h r a c i t e R i d g e

C

h

u

g

a

c

h

M

o

u

n

t

a

i

n

s

Hatcher

 Pass

Indian Creek

Pass

Bird Creek

Pass

Crow Pass

Turnagain

Pass

American

 Pass

Lake Clark

Pass

Portage

Pass

Hayes River

Pass

Hyphen Gulch

Wet Gulch

Grubstake Gl

Sheep

Valley

The

Gorge

Grasshopper Valley

Gold Gulch

Placer River Valley

M a t a n u s k a

V a l l e y

B R U I N

B A Y

F A U L T

L A K E

C L A R K

F A U L T

E

A

G

L

E

R

I V E

R

F

A

U

L

T

C A S T L E

M O U N T A I N

F A U L T

E

A

G L E

R

I

V

E R F

A

U

L

T

C A R I B O U

F A U L T

P

L

A

C

E

R

R

I

V

E

R

F

A

U

L

T

Eagle Ri ver Flats

T a l k e e t n a

M o u n t a i n s

Powerline

Pass B

O

R

D

E

R

R

A

N

G

E

S

F

A

U

L

T

Curry Ridge

Nin Ridge

S u s i t n a F l a t s

Lone Ridge

Bell Island

Barrel

 I

B gi Island

Delta

 I

Moose

 Point

North Pt

West Pt

Race Point

Pt Campbell

Pt Woronzof

Magot Pt

Granite Pt

Pt Possession

Fire

Island

North Foreland

West Foreland

B a c h a t n a F l a t s

McArthur Flats

T r a i l R i d g e

Fox

Flats

Kustatan Ridge

Boulder

 Point

East Foreland

Double

Glacier

Lake George Glacier

Colony Glacier

Eagle

Glacier

Raven Gl.

Eklutna

Glacier

Whiteout Glacier

K n i k G l a c i e r

Ma rcus Bake r Glac i e r

Chickaloon

Glacier

Talkeetna

Glacier

Ruth Glac i e r

Tokositna Glacier

Kanikula Glacier

K

a

h

i

l

t

n

a

G

l

a

c

i

e

r

H a y e s

G l a c i e

r

N. Branch Trimble Glacier

S. Branch Trimble

Glacier T r i u m v i r a t e G l a c i e r

North Twin Glacier

S. Twin Gl.

Harpoon Gla c i e r

Pot hol e Gla c i e r

Barrier Glacier

Kidazqueni Gl.

C a p p s G l a c i e r

Dogshead

Glacier

S h

a

m

r

o

c

k

G l

a

c i e

r

Blockade Glacier

Ta n

a

i

n

a

G l a

c

i

e r

Kings

Mountain

Alger

Peak

Mount

Alpenglow

Mount

Alyeska

Bald

Mountain

Baleful

Peak

Barnes

Mountain

Bashful

Peak

Beluga

Mountain

Benign

Peak

Birch

Hill

Bird

Peak

Black

Peak

Blueberry

Hill

Bodenburg

Butte

Bold

Peak

Bradley

Peak

Bullion

Mountain

Burnt

Butte

Calliope

Mountain

Castle

Mountain

Cathedral

Mountain

Coach

Butte

Columbia

Peak

Crater

Peak

Dickason

Mountain

Dinglishna

Hill

Distin

Peak

Double

Peak

Eagle

Peak

East

Twin

Peak

Mount

Eklutna

Eska

Mountain

Mount

Estelle

Eva Peak

Fairview

Mountain

Flattop

Mountain

Mount

Gerdine

Goat

Mountain

Gold

Hill

Mount

Gordon

Lyon

Government

Peak

Granite

Peak

Harp

Mountain

Hurdygurdy

Mountain

Idaho

Peak

Indianhouse

Mountain

Kickstep

Mountain

Mount

Kliskon

Knob

Hill

Kohlsaat

Peak

Lava

Mountain

Lazy

Mountain

Little

Mount

Susitna

Mount

Magnificent

Matanuska

Peak

McDoel

Peak

McHugh

Peak

Montana

Peak

O'Malley

Peak

Organ

Mountain

Mount

Palmer

Peeking

Mountain

Pinnacle

Mountain

Pioneer

Peak

Porcupine

Butte

Ptarmigan

Peak

Puddingstone

Puntilla

Mountain

Radar

Hill

Raggedtop

Mountain

Red

Mountain

Skyscraper

Mountain

South

Peak

Sovereign

Mountain

Mount

Spurr

Mount

Stoney

Suicide

Peaks

Mount

Susitna

Tanaina

Peak

Temptation

Peak

The

Mitre

The Ramp

The

Wedge

Thunder

Bird Peak

Tincan

Peak

Mount

Torbert

Wells

Mountain

Mount

Williwaw

Willow

Mountain

Wishbone

Hill

Wolverine

Peak

Mount

Yenlo

West

Twin

Peak

Hill

Anchorage

Big Lake

Palmer

Wasilla

Susitna

Petersville

Skwentna

Houston

Knik

Sutton

Chickaloon

Willow

Eklutna

Hope

Tyonek

Talkeetna

Anna

Baker

Bruce

Dillon

Dolly Varden

Granite Point

Grayling

King Salmon

Monopod

Osprey

Shell "A"

Shell "C"

Spark Spurr

Steelhead

Tyonek

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

Kyh

Kyh

Qig

Qig

Qig

Qm

Qat

Qat

Qm

Qig

Qdl

Qgo

Qgo Twf?

Qdl

Qes

Qm

Qat

Qdl

Qgc

Tvs

Tvs

Kes

Kes

Kes

Kqd Kqd

Qm

Jqd

Tar

Jtr

Jtr

Qm

Qm

Qm

Qm

Qm

Qm

Km

Km

Km

Km

Tch

Tch

Qaf

Kgd

TKgd

Tar

Tar

Jtk

Qgc

Qgc

Qgc

Qsl

Qat

Qgc

Qsl

Qgc

Qgo

Qat

vs

Qsl

Qsl

Qaf

Qaf

KJs

Tkn

Tkn

Qat

Tkn

Qcg KJs

Qat

Qsl

Tch

Tch

Tw

Tar

Tar

Tar

TKg

TKg

TKg

TKg

TKg

TKg

KJs

Kes

KJs Kivs

Kv

Kv

Tpgr

Tpgr

Thg Thg

Kivs

Tvu

Tvu

Jtk

Jtk

Jtk

Km

Km Km

Km

Jc

Jt

Jt

Jqd

Jqd

Jqd

Jtr

Jtr

Jtk

Jtr

Jtr

Jtr

Jtr

Jtr

Jtr

Jtr

Jqd

Jtr

Jqd

Tar

Tar

Qm

Qm

Qm

Qho

Qsl

Qhg

Kv

Qho

Qho

Tkt

Qlc

Qlc

Qlc

Twf

Qhv

Kivs

Qm

Qdf

Qlc

Tpd

Tpgr

Thg

Tpgr

Tpgr

Qhv

Qhv

Tpgr

Qlc

Qgc

Qgc

Qgc

TKv

Qm

TKv

Qgc

Thg

TKv

Tpgr

Tpgr

Tpgr

Tpgr

Qm

Qm

Qm Qm

Qm

Tpgr

Tvu

KJs

Qat

Tgd

Tgd

Tgd Tgd

Tvu

KJs

Tgd?

Tgd

TKgd

Kgd

Tgd Kgd

Tvu

TKgd

TKgd

TKgd

TKgd

Tgd

TKg

KJs

TKgd?

TKgd

Kgd

TKgd

TKgd

TKgd

Qm

Jqd

Jpmu

Jqd

TKv TKgd?

TKgd

TKgd

TKgd

Kqms

KJs

KJs

KJs

Qm

KJs

KJs

TKg

Tpgr

TKg

TKg

KJs

TKg

KJs

KJs

KJs

Ksf

Ksf

Ksf

Ksf

TKg

KJs

KJs

Qm

Qm

KMm

KMm

Jum Qho

Kvs

Kvs

Kvs

Kvs

Qat

Kvs

Qat

Qho

Kvs

Qaf

KMm

Qm

Jsch

Jsch

Jsch

Jsch

KMm

KMm

KMm

KMm

KMm

Kvs

Kvs

Kvs

Kvs

Kvs

Kvs

Km

Jeqd

Jeqd

Jtk

Jtk

Jtk

Jtk

Jeqd

Jeqd

Qaf Qtf

Qtf

Tfv

Qm

Qm

Qat

Kvs

KMm

TKgd TKgd?

vs

Jpmu Tem

Tem

Jpmu

n

TKgd

TKgb

n

Qm

Qaf Qaf Qaf

Qaf

JPmb

n

vs

vs

vs

vs

vs

vs

vs

Tgd

Tgd

Qm

Qm

Qm

Qat

vs

vs

vs? vs

Tpgr

KMm

KMm

KMm

KMm

KMm

KMm

KMm

KMm

Qaf

Qlc

Qtf

Qtf

Qtf

Qtf

Qtf

Qtf

Qtf

Qtf

Qes

Qes

Qge

Qgo

Qes

Qge

Qes

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qm

Qgo

Qm

Qes

Qaf

Qaf

Qaf

Kum

Tar

Tar

Kps

Kps

JPam

Jtr

Tpgr

Tpgr

Tpgr

KJs

Qm Qm

KJs

KJs

KJs

Tpgr

Tpgr

Tpgr

Tpgr

Tpgr

KJs

KJs

Qm

KJs

Tks

Tkt

KJs

Qho

Qm

Qm

Qm

Qm

Qog

Qog

KJs

KJs

KJs

Qm

Qm

KJs

Qm

KJs

Tpgr

Tpgr

KJs

Qog

Qog

Tks

Tks

Tks

Tks

Tks

TKv

KJs

Qm

TKv

Tkn

Qlc

Qho

Qho

Qho

Qm

Qgo

Qm

Qsl

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qgo

Qat

Qge

Qat

Qm

Qgo

Qm

Qm

Qm

Qm

Qm

Qm

Qm

TKgd?

Qm

TKgd

JPmb

JPmb

Tfv

Tsu

Qhg

Qat

TKd

Qgo

Qm

Qgo

JPam

JPam

JPam

JPam

Qm

Qm

Qm

Qm

TKgd

TKgd

Kgd

TKgd

TKgd

TKgd

Qhg

Kqd

JPk Jtr

Jtr

Jqd

Qhg

Qho Jtr

Jtr

Jqd

Jqd

Jtk

Qhg

Qm

Qgc

Jqd Kqd

Jqd

Jqd

Kqd

Kqd

Qhg

Qho

Qm

Kqd

Kqd

TKgd Qm

Qaf

Kivs

Kivs

Kivs

Kivs Qgo

Qgl

Qgl

Qgl

Qgo

Qm

Qgc

Kivs

KJs

Kivs

Kivs

Qm

Qm

Qm

Qm

Qat

Qm

Qm

Qm

Kivs

Qge

Qgo

Qgo

Qgo

Kgd

Tpgr

Tpgr

Kgd

Kgd

Kvs

Kvs

Kvs

Kvs

Kvs

Qm

Qm

Kvgs

Kvgs

KMm

KMm

KMm

KMm?

KMm?

Qm

Qm

KMm

KMm?

Qog

Kvs

Kvs

Kvs

Qat

Qat

Kvs

Kvs

Kvs

Kvs

Kvs

Kvs

Qat

Qhg

Kvs

Kvs

Kvs

Kvs

KJs

KJs

KJs

KJs

KJs

KJs

KJs

KJs

KJs

KJs

KJs

Qhg

Qhg

KJs

Qs

Qm

KJs

Qm

Qaf

Qaf

KJs

Qm

Qho

Qho

Qho

Qgo

Qgo

Qgo

Qgo

Qm

Qaf

Qgo Qho Qm

Tkn

Qgo

Qgo

Qm

Qm

Qm

Qgc

Qm

Qm

TKv

Qm

Qs

Qhg

Tkt

Tkt

Qgo

Tpgr

KJs

Qm

Tkt

KJs

KJs

Qgc

Qat

Qat

Qat Qsl

Qsl

Qsl

Qsl

Qat

Qat

Qat

Qat

Qat

Qat

Qat

Qat

Qm Qm

Qm

Qs

Qs

Qm

Qs

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Qho

Qat

Qat

Qlc

Qgc

Qgc

Qgc

Qgc

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Qgc

Tkt

Tkt

Tkt

Qat

Tkt

Tpgr

Tkn

Qs

Qs

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Qs

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Tkt

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Tpgr

Tks

Qm

Tpgr

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Tkt

Qs

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Qs

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Tvu

vs

KJs?

vs?

n?

Qm

Qm

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vs

TKg

TKg

TKg

TKg

Tvu

Tvu

Qm

Qat

JPmb

Qaf

Qaf

Qlc

Qm

TKgd JPmb

vs

Kgd

Tpgr?

TKgb

Qgo

Qaf

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Tpgr?

Qm

TKgd

Qhg

Qhg

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JPmb

Jpmu

Qhg

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Tgd

KJs

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TKgb

TKgb

Tpgr

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vs

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Qaf

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Qhg

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Qs

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JPam

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Qm

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Qm

Qhg

Qhg

Qm

Qm

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Jtk

Jtk?

Qhg

Jlm

Jlm

Jlm

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Jlm

Jlm

Jlm Jqm

Jlm

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Qhg

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Tar Jtk

Jtk

Jtk

Jtk

Jtk

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Jum

Jum

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TKc

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TKc

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TKc

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TKc

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TKd

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Kum

Kum

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Jum

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Klt

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Qlc

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Qhg

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TKg

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Qm

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Qm

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Qm

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Qdl

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Qm

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Qaf

Qaf

Qaf

Qaf

Qge

Qge

Qge

Qge

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Qat

Qgm

TKg

TKg

TKgd

TKgd

TKgd

TKg

TKgd

TKgd

Tpgr

Tpgr

Tpgr

Tpgr

Tpgr

Kes

Kes

Tpgr

Tpgr

Tpgr

Qat

Qat

Kivs

Qm

Kes

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Qat

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Qm

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Kogr

Kogr

Kogr

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Qgo

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Qge

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Qm

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Qlc

Qm

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TKgb

Kes

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Qaf

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Qm

Qm

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Qm

Qm

Qm

Qm

Qm

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Kivs

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Qaf

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Qhv

Qhv

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Qv Qv Twf

Qm

Qm

Kes

Qat

Qlc

Qhg

Qhg

TKgd

Qhg

Qhg

Qhg

TKgb TKg

TKg

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Qgc

TKgd

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Qat

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Qat

Qat

Qat

Kv

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Tkn?

Qsl

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TKv

KJs

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KJs

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Qlc

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Qaf Qho

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KJs

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Tgn

Qm

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Qig

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Qgm

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KJs

KJs

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Qhg

Kv?

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Kogr Tpgr?

Tpgr

Tpgr?

Kv

Kv

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Kqd?

Qm

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Qaf

TKgg

KJq

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KJq

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Qaf

Qdl

Qat Qhg

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Qat

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Kgd

Kgd

KJq

TKgd

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KJq

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Jqd Jtk

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Qat

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Qtf

Qtf

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Jtk

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Qat

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Tgn

Thg

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TKgd

TKgb

Kgr

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Kqms

Kum

Kogr

Klt

KJq

Jtr

Jqd

Jqm

Jmu

Jeqd

Jum

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TKc

TKgg

Kvs

Kvv

Kvgs

Kvm

KMm

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KJms

Kmc

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JPk

Jpmu

JPam

JPmb

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Kivs

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Qgl

Qm

Qgm

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Tsu

Tkn

Tks

Tkb

Tkt

Tkh

Tts

Tvs

Tw

Twf

Tar

Tch

Tcl

Kyh

Kkd

Ksm

Kkg

Kcc

Km

KJs

Ksf

Kes

Khe

Jn

Jnk

Jni

Jnp

Jnst

Jnn

Jnc

Jc

Jcp

Jct

Jt

Jtt

Jtb

Jtc

Jtf

Jtg

Jtrg

Jtk

Jtkh

Jtkp

Jtkm

Jlm

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km

kb

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sv

pg

LIST OF MAP UNITS

[See Description of Map Units (in pamphlet) for complete unit descriptions. Some unit 

exposures on the map are too small to distinguish the color for unit identification. These units 

are labeled where possible, and all units are identified by atttributes in the database]

UNCONSOLIDATED DEPOSITS

Surficial deposits, undivided (Quaternary)

Alluvium along major rivers and in terraces (Holocene)

Modern tidal flat and estuarine deposits (Holocene)

Estuarine deposits (Holocene)

Alluvial fan deposits (Holocene and Upper Pleistocene)

Debris-flow deposits (Holocene)

Landslide and colluvial deposits (Holocene and Upper Pleistocene)

Beach deposits (Holocene)

Lacustrine, swamp, and fine silt deposits (Holocene and Upper Pleistocene)

Eolian deposits (Holocene)

Deltaic deposits (Holocene and Upper Pleistocene)

Glacial deposits

Young moraine deposits (Holocene)

Younger outwash deposits (Holocene)

Glaciolacustrine deposits (Holocene and Upper Pleistocene)

Major moraine and kame deposits (Upper Pleistocene)

Modified glacial deposits (Upper Pleistocene)

Glacioalluvium (Upper Pleistocene)

Outwash in plains, valley train, and fans (Upper Pleistocene)

Glacioestuarine deposits (Upper Pleistocene)

Bootlegger Cove Formation (Upper Pleistocene)

Intermediate age glacial deposits (Upper Peistocene)

Older glacial deposits (Middle or Lower Pleistocene)

SEDIMENTARY ROCKS

Sedimentary rocks, undivided (Tertiary)

Kenai Group, undivided (Pliocene to Oligocene)

Sterling Formation (Pliocene and Miocene)

Beluga Formation (Miocene)

Tyonek Formation (Miocene and Oligocene)

Hemlock Conglomerate, undivided (Oligocene)

Tsadaka Formation (Miocene or Oligocene)

Volcaniclasitc sedimentary rocks (Eocene or younger)

Wishbone Formation (Eocene)

West Foreland Formation (Eocene and Paleocene)

Arkose Ridge Formation (lower Eocene and upper Paleocene)

Chickaloon Formation (lower Eocene and upper Paleocene)

Copper Lake Formation, undivided (lower Eocene and Paleocene?)

Graywacke of the Yenlo Hills (Cretaceous?)

Kodiak Formation (Upper Cretaceous)

Saddle Mountain section of Magoon and others (1980) (Upper Cretaceous, 

Maastrichtian)

Kaguyak Formation (Upper Cretaceous, Maastrichtian and Campanian)

Cape Current terrane of Connelly (1978) (Upper Cretaceous)

Matanuska Formation (Upper Cretaceous, Maastrichtian, to upper Lower 

Cretaceous, Albian)

Turbiditic sedimentary rocks of the Kahiltna flysch sequence (Cretaceous, 

Aptian and Valanginian or younger, to Upper Jurassic?)

Feldspathic sedimentary rocks (Cretaceous)

Turbiditic sedimentary and volcanic rocks (Cretaceous, Aptian or younger)

Herendeen Formation (Lower Cretaceous, Barremian and Hauterivian)

Naknek Formation, undivided (Upper Jurassic, Tithonian to Oxfordian)

Katolinat Conglomerate Member (Tithonian)

Indecision Creek Sandstone Member (Tithonian and Kimmeridgian)

Pomeroy Arkose Member (Kimmeridgian and Oxfordian?)

Snug Harbor Siltstone Member (Kimmeridgian and Oxfordian)

Northeast Creek Sandstone Member (Oxfordian)

Chisik Conglomerate Member

Chinitna Formation, undivided (Middle Jurassic, Callovian)

Paveloff Siltstone Member

Tonnie Siltstone Member

Tuxedni Group, undivided (Middle Jurassic, lower Bathonian to Aalenian)

Bowser Formation (Middle Jurassic, lower Bathonian and upper Bajocian)

Twist Creek Siltstone (Bajocian)

Cynthia Falls Sandstone (Bajocian)

Fitz Creek Siltstone (middle Bajocian)

Gaikema Sandstone (lower middle Bajocian)

Red Glacier Formation (lower Bajocian to Aalenian)

Talkeetna Formation, undivided (Lower Jurassic)

Horn Mountain Tuff Member

Portage Creek Agglomerate Member

Marsh Creek Breccia Member

Limestone and marble (Lower Jurassic or Upper Triassic?)

Pogibshi formation of Kelley (1980), undivided (Lower Jurassic, Sinemurian 

to Hettangian and older?)

Port Graham formation of Kelley (1980) (Upper Triassic, Norian)

Kamishak Formation (Upper Triassic, Norian)

Ursus Member

Middle Member

Bruin Limestone Member

Shuyak Formation (Upper Triassic)

Shuyak Formation, sedimentary member

Shuyak Formation, volcanic member

IGNEOUS ROCKS

VOLCANIC AND HYPABYSSAL ROCKS

Volcanic rocks, undivided (Quaternary)

Dacitic to rhyolitic domes (Holocene)

Volcanic rocks (Holocene)

Andesite and dacite domes (Pleistocene)

Old volcanic rocks, undivided (Pleistocene or Pliocene)

Tertiary volcanic rocks, undivided (Tertiary)

Basaltic volcanic rocks (Pliocene)

Gibraltar Lake Tuff (Pliocene? to Oligocene?)

Paleogene volcanic rocks, undivided (Oligocene and Eocene)

Basalt and andesite

Tuffaceous felsic volcanic rocks (Eocene?)

Felsic volcanic and sub-volcanic rocks (Eocene)

Mafic volcanic rocks (Eocene)

Dikes and sills (Tertiary to Cretaceous)

Intermediate to mafic volcanic rocks (Paleocene)

Felsic tuff (early Tertiary or Cretaceous)

Older volcanic rocks, undivided (Paleocene to Upper Cretaceous)

Intermediate and felsic volcanic rocks (Cretaceous)

Mafic dikes, sills, and plugs (Triassic?)

Nikolai greenstone and related rocks (Upper and (or) Middle Triassic)

Cottonwood Bay Greenstone (Upper Triassic, Carnian or older)

PLUTONIC ROCKS

Intrusive rocks, undivided (Tertiary)

Intermediate intrusive rocks (Pliocene and latest Miocene)

Granitic rocks (Oligocene and late Eocene)

Gabbronorite (Oligocene? or Eocene?)

Hypabyssal granitic rocks (Paleocene?)

Granitic rocks of Paleocene age (Paleocene)

Biotite-hornblende-granodiorite

Biotite diorite

Granitic rocks, undivided (Paleocene to Late Cretaceous)

Granodioritic rocks

Gabbroic rocks (Tertiary and (or) Cretaceous)

Granite (Cretaceous)

Granodiorite (Late Cretaceous)

Quartz diorite (Late Cretaceous)

Quartz monzonite, monzonite, and syenite (Late Cretaceous)

Ultramafic rocks (Late Cretaceous)

Older granite (Cretaceous, Cenomanian)

Leucontonalite and trondhjemite (Early Cretaceous, Albian to Barremian)

Quartz monzodiorite (Cretaceous? and (or) Jurassic?)

Alaska-Aleutian Range Batholith (Jurassic phase)

Trondhjemite (Late Jurassic)

Quartz diorite, tonalite, and diorite (Jurassic)

Granodiorite and quartz monzonite (Middle and late Early Jurassic)

Mafic and ultramafic plutonic rocks (Middle and late Early Jurassic)

Plutons proximal to the Border Ranges Fault Zone

Quartz diorite and tonalite (Middle and Early Jurassic)

Mafic and ultramafic rocks, undivided (Middle Jurassic or older?)

Quartz diorite to diorite (Late Triassic)

MÉLANGE AND METAMORPHIC ROCKS

Cataclastite (Eocene? and Cretaceous, metamorphic age)

Gneiss (Tertiary or Cretaceous, metamorphic age)

Valdez Group (Upper Cretaceous)

Metasedimentary rocks, undivided

Mafic metatuff

Schist

Mélange of Iceworm Peak of Kusky and others (1997)

Metamorphosed intermediate volcanic and sedimentary rocks (Cretaceous)

Pelitic schist (Cretaceous?)

Metamorphosed mafic volcanic and sedimentary rocks (Mesozoic and 

Paleozoic)

McHugh and Uyak Complexes, undivided (Cretaceous to Mississippian)

Gabbro (Mesozoic)

Ultramafic plutonic rocks (Mesozoic)

McHugh Complex, graywacke and conglomerate (Early Cretaceous to Late 

Jurassic, Pliensbachian)

McHugh Complex, basalt and chert (Early Cretaceous, Albian to Middle 

Triassic, Ladinian)

Greenschist and blueschist (Jurassic, metamorphic age)

Kakhonak Complex (Jurassic, Triassic, and Permian? or older?)

Plutonic and metamorphic rocks, undifferentiated (Middle to Early Jurassic, 

metamorphic age)

Amphibolite (Lower Jurassic or older)

Marble (Jurassic, metamorphic age; Permian?, protolith age)

Basaltic to andesitic metavolcanic rocks (Triassic?, Permian, Cisuralian, and 

Pennsylvanian?)

BEDROCK

Bedrock, unknown

EXPLANATION OF MAP SYMBOLS

WELL SYMBOLS

Platform

Well, undefined

Gas producer

Oil producer

Gas injection

Water injection

Plugged and abandoned

Plugged and abandoned gas show

Plugged and abandoned oil show

Plugged and abandoned oil and gas show

Suspended

Waste disposal

LINE SYMBOLS

Contact—Dashed where approximate and inferred, dotted where concealed

Fault—Dashed where approximate and inferred, dotted where concealed

Thrust fault—Dashed where approximate and inferred, dotted where concealed. 

Sawteeth on upper plate

High-angle reverse fault—Dashed where approximate and inferred, dotted where 

concealed. Sawteeth on upper plate

Lineament

Syncline—Dashed where approximate and inferred. Large arrowhead shows 

direction of plunge

Anticline—Dashed where approximate and inferred. Large arrowhead shows 

direction of plunge

Crater rim

Moraine

Ice contact

Shoreline or riverbank

Dike

Road

City or town

Glaciers

Prepared in cooperation with the

Alaska Department of Naural Resources Division of Oil and Gas

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3153

Sheet 1 of 2

Pamphlet accompanies map

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

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 (http://pubs.usgs.gov/sim/3153/).

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

150°00'

153°00'

62°00'

60°39'

61°00'

153°00' 60°39'

61°00'

62°00'

150°00'

Printed on recycled paper

Turbiditic sedimentary rocks of the Kahiltna flysch sequence along the Happy 

River. A (Teriary?) felsic dike cuts through the sedimentary rocks in the center of 

the photograph. (photograph by Chad Hults)

Mount Spurr, Crater Peak, and Crater Glacier. (photograph by Chad Hults)

Terminal moraine of the Shamrock Glacier that divides Kenibuna Lake from 

Chackachamna Lake. (photograph by Chad Hults)