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159˚00'61˚00'

60˚00'

59˚00'158˚00'

158˚00'58˚15'

160˚00'

162˚30'58˚15'

59˚00'

165˚00'

168˚00'59˚30'

60˚00'

61˚00'168˚00'

165˚00' 162˚00'

EEK MOUNTAINS

G r ea t

R

i dg e

Gree

nston

e Ridg

e

WOOD

RIV

ER M

OUNT

AINS

K US K

OKW

I M M

OU N

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S

KI L

BU

CK

MO

UN

TA

I NS

WOOD

RIVE

R MOU

NTAIN

S

AH

KL

UN

M

OU

NT

AI

NS

GemukMountain

FisherDome

MountOratia

MountWaskey

ThumbMountain

MountPlummer

AeolusMountain

DowndraftMountain

RedMountain

SusieMountain

ChagvanMountain

TokomarikMountainJagged

MountainNichols

Hills

Tununak

Umkumiut

Toksook Bay

Nightmute

Chefornak

Kipnuk

Mekoryuk

Newtok

Kongiganak

Kwigilligok

Tuntululiak

Eek

K U S K O K W I M B A Y

KasiglukNunapitchuk

Atmautluak

Akrachak Akiak

KwethlukBethel

OscarvilleNapaskiak

Napakiak

Clarks Point

Ekuk

Manokotak

Twin HillsTogiak

Platinum

Goodnews Bay

Quainhagak

B E R I N G S E AH A Z E N B A Y

E T O L I N S T R A I T

K U S K OK

WI M

R

I V

E R

B A I R D I N L E T N u n a v a k p a kL a k e

K w e t h l u k River

E e k R i v e r

C r o o k e d C r e e k

Aniak

Lake

U p n u k L a k e

KisaralikLake

C h i k u m i n u kL a k e

L a k eC h a u e k u k t u l i

N u y a k u kL a k e

L a k eN e r k aT o

g ia k

La k

e

L a k eA l e k n a g i k

G o o d n e w sB a y

Ua li k

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e

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K a n t e k t o k R i v e r

T og i

a k

R i v e r

H a g e m e i s t e r S t r a i t

To g i a k B a yKulukak

Bay

SecurityCove

ChagvanBay

Mat og a

k R

iver

MetervikBay

N u s h u g a kB a y

L a k eN u n a v a u g a l u k

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l Cree

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N a y o r ur u n R i v e r

B R I S T O L B A Y

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B i n a k s l i t Bluff

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SCIENTIFIC INVESTIGATIONS MAP XXXXU.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

RECONNAISSANCE GEOLOGIC MAP FOR THE KUSKOKWIM BAY REGION OF SOUTHWEST ALASKACompiled by

Frederic H. Wilson, Chad P. Hults, Solmaz Mohadjer, and Warren L. Coonrad2007

DRAFT MAP 90% scale

Hydrologic base information derived from U.S. Geological Survey1:63,360 scale DLG files. Shaded relief derived from USGS2 arc second NED files. Alaska Albers Equal Area projection.

Index map, geographic setting of the Kuskokwim Bay region map area

B R I S T O L B A Y

B E R I N G S E A

BAIRDINLET BETHEL

CAPEMENDENHALL GOODNEWS BAY

HAGEMEISTERISLAND

KUSKOKWIMBAY

NUNIVAKISLAND

NUSHAGAKBAY

PRIBILOFISLANDS

ST MATTHEW

SOURCES OF INFORMATIONSee References section for complete bibiographical information

of published sources

BETHEL QUADRANGLE1:250,000 scale

Box, S.E., Moll-Stalcup, E.J., Frost, T.P., and Murphy, J.M., 1993Hoare, J.M., and Coonrad, W.L., 1959aHoare, J.M., and Coonrad, W.L., 1978

Wilson, F.H., 1977Wilson, F.H., and Hults, C.P., 2006, Unpublished data

BAIRD INLET QUADRANGLE1:500,000 scale

Coonrad, W.L., 19571:250,000 scale

Wilson, F.H., and Hults, C.P., 2006, Unpublished dataCAPE MENDENHALL QUADRANGLE

1:250,000 scaleHoare, J.M., Condon, W.H., Cox, A., and Dalrymple, G.B., 1968

GOODNEWS BAY QUADRANGLE1:250,000 scale

Box, S.E., 1985aHoare, J.M., and Coonrad, W.L., 1961bHoare, J.M., and Coonrad, W.L., 1978

Wilson, F.H., 1977Wilson, F.H., and Hults, C.P., 2006, Unpublished data

1:63,360 scaleHoare J.M., and Coonrad, W.L., field maps circa 1975

HAGEMEISTER ISLAND QUADRANGLE1:250,000 scale

Box, S.E., 1985aHoare, J.M., and Coonrad, W.L., 1961aHoare, J.M., and Coonrad, W.L., 1978

Wilson, F.H., and Hults, C.P., 2006, Unpublished dataKUSKOKWIM BAY QUADRANGLE

1:500,000 scaleCoonrad, W.L., 1957

1:250,000 scaleWilson, F.H., and Hults, C.P., 2006, Unpublished data

NUSHAGAK BAY QUADRANGLE1:250,000 scale

Box, S.E., 1985aHoare, J.M, and Coonrad, W.L, 1978

Wilson, F.H., Hults, C.P., and Coonrad, W.L., 2006, Unpublished data1:63,360 scale

Hoare, J.M, and Coonrad, W.L, field maps circa 1975NUNIVAK ISLAND QUADRANGLE

1:500,000 scaleCoonrad, W.L., 1957

1:250,000 scaleHoare, J.M., Condon, W.H., Cox, Allan, and Dalrymple, G.B., 1968

PRIBILOF ISLANDS QUADRANGLE1:63,360 scale

Barth, T.F.W., 1956SAINT MATTHEW ISLAND QUADRANGLE

1:250,000 scalePatton, W.W., Jr., Miller, T.P., Berg, H.C., Gryc, George,

Hoare, J.M., and Ovenshine, A.T., 1975

10 0 10 20 30 40Miles

SCALE 1:500 000

10 0 10 20 30 40 50Kilometers

!(

Saint PaulIslandSaint Paul

OtterIsland

Qvs

Qvs

Qpd

Qpd

QpdQTv

Qed

Qed

170°0'

170°0'

170°15'

170°15'

57°12' 57°12'

57°6' 57°6'

SCALE 1:250 0002.5 0 2.5 5 7.5 10

Miles

!(

Saint GeorgeIsland

Saint George

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Qpd

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169°30'W

169°30'W

169°45'W

169°45'W

56°36'N 56°36'N

56°30'N 56°30'NSCALE 1:250 000

2.5 0 2.5 5 7.5 10Miles

Saint MatthewIsland

S A R I C H E F S T R A I T

HallIsland

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172°30'

172°30'

173°0'

173°0'

60°30' 60°30'

60°15' 60°15'

2.5 0 2.5 5 7.5 10Miles

SCALE 1:300 000

ALASKA CANADARUSSIA

MAP AREA

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Glacial moraineOutwash deposits

Chloritic phyllite

Chert and argillite

Arkosic sandstone and slate

Marble and metabasaltic dikesMeta-chert and phyllitic meta-chert

Basalt flows, Matuyama polarity epoch Volcaniclastic sandstone and argillite

Granite

Melange

LimestoneMonzonite

Granodiorite Clastic rocks

Pillow basalt

Silt deposits

Reworked silt

Volcanic rocks

Beach deposits

Eolian depositsMarine terraces

Basalt and chert

Calcareous schist

Pyroclastic rocks

Alluvial depositsPhyllite and chert

Estuarian deposits

Metabasaltic schist

Argillaceous melange

Thin-bedded limestoneMafic intrusive rocksGreenstone and schist

Basalt flows, undivided

Coarse volcaniclastic rocksGlacial deposits, undivided

Alkalic basalt of Karon Lake

Green amphibole bearing schist

Volcanic and sedimentary rocks

Argillite and tuffaceous chert

Monzodiorite and quartz diorite

Volcaniclastic sedimentary rocks

Kuskokwim Group, nearshore facies

Older alkalic basalt of Karon Lake

Dismembered volcaniclastic turbidites

Marine arkosic sandstone and argillite

Quartz monzonite and quartz monzodiroite

Tidal flat and active estuarine deposits

Turbidites of Metervik Bay of Box (1985a)

Laminated tuff and associated rocks of Box (1985a)

Volcaniclastic glaucophane-hornblende-epidote schist

Volcaniclastic turbidites of Togiak Bay of Box (1985a)

Marine volcaniclastic sandstone, conglomerate, and argilliteMarble

Glaciers

Unmapped

Trondhjemite

Serpentinite

Pillow basalt

Gabbroic rocks

andesite flows

Coonrad (1983)

Pyroxene gabbro

Kuskokwim Group

Ultramafic rocks

Contact alteration

Andesite and basalt

Felsic intrusive rocks

Summit Island Formation

Volcaniclastic sediment

Granodiorite and granite

Rhyolite and dacite tuff

Diabasic intrusive rocks

Hoare and Coonrad (1983)

Volcanic rocks, undivided

Granitic rocks, undivided

Graywacke of Buchia Ridge

Aplite on St. George Islandof Hoare and Coonrad (1983)

Surficial deposits, undivided

Volcanic and sedimentary rocks

Volcanic and sedimentary rocks

Nukluk Volcanic Field, rhyolite

Peridotite on St. George Island

Volcanic graywacke and argillite

Alkalic basalt of Ahzwiryuk Bluff

Basaltic and andesitic lava flows

Hypabyssal felsic intrusive rocks

Togiak-Tikchik Complex, undivided

Hagemeister pluton of Box (1985a)

Tholeiitic basalt of Binakslit Bluff

Semiconsolidated marine beach deposits

Kanektok metamorphic complex, undivided

Interbedded volcanic and sedimentary rocks

Intermediate and silicic pyroclastic rocks

Nukluk Volcanic Field, basalt and andesite

Slate Creek pluton of Box and others (1993)

Volcaniclastic conglomerate, sandstone, and shale

Rhyolite and dacite flows, tuff, dikes, and sills

Sandstone, shale, and conglomerate deltaic deposits

Graywacke of Kulukak Bay of Hoare and Coonrad (1978)

Little Kasigluk River pluton of Box and others (1993)

Volcanic and sedimentary rocks of the Mount Oratia belt of

Calcareous graywacke and siltstone of the Eek Mountains belt

Limy grit and limestone of the Ungalikthuk belt of Hoare and

Eek and Swift Creek volcanic fields of Box and others (1993);

Volcanic rocks; tuff shown with dots, rhyolite shown with slashes

Bay quadrangles:

Bethel Quadrangle:

of Box and others (1993)

Hagemeister Island and southern Goodnews

Rock units of the Kisaralik Anticlinorium

JURASSICTERTIARY

QUATERNARY

CRETACEOUS

TERTIARY TO JURASSIC

TERTIARY AND (OR) CRETACEOUS

METAMORPHIC ROCKS OF THE TOGIAK-TIKCHIK COMPLEX

IGNEOUS ROCKSSEDIMENTARY ROCKS

AND COONRAD (1979)

TOGIAK-TIKCHIK COMPLEXUNCONSOLIDATED DEPOSITS

OPHIOLITE COMPLEX OF BOX (1985a)

KANEKTOK METAMORPHIC COMPLEX OF HOARE

LIST OF MAP UNITS

Pribilof Islands

Town

DRAFT MAP DRAFT MAP

TfiTtbTalb

QvbmQvb

QTvQcsQpd

QTab

<km<k

DOl

MDmMDv

Pls PcsPvsPv

}|a^Pcs^Pvs

^v^og^od^ob

^vs

J^otJ^p

Jln

}|p

Jgs^Pmb

Jmm

Jkw

Jgs

JvtJaJvc

}|p

KJba

K^vs

}|c}|v

}|s}|m

}m

}|t

Kv KspKpdKvKv

TJikKg

T}p

TJih

TKmTKqdTKgd

TKqmTKgsTKgrTKgTKaTKrTad

TnbaTnr Tvep

QTsQvsQgoQgmQmtQesQbQgQsdQedQrs

Jvs

J^cv

Jlt

KJbKJc

Kygv

JlgdJtk

Jgb

JmvJabJum

KcgcKvmKlgKgbrKkn

Kys

Kk

Ks

TJis

QaQtf

Qs

CORRELATION OF MAP UNITSUnconsolidated deposits and sedimentary rocks Igneous rocks Togiak-Tikchik Complex

Sedimentary and metamorphic rocksOphiolitic rocks

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC

PERMIAN

PENNSYLVANIAN

MISSISSIPPIAN

DEVONIAN

SILURIAN

ORDOVICIAN

CAMBRIAN

PROTEROZOIC

* Map unit Jgs has metamorphic age of Late Jurassic, protolith may be as old as Ordovician

Kanektok Metamorphiccomplex

*

Contact, dashed where approximate and inferred,dotted where concealedFault, unknown displacement, dashed whereapproximate and inferred, dotted where concealedNormal fault, dashed where approximate and inferred,dotted where concealed

+ Thrust fault, dashed where approximate, dotted whereconcealed

Shoreline or riverbankIce contact

Lineament

+ +

List of Line Symbols

Caldera or crater rim

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