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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
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SusieMountain
ChagvanMountain
TokomarikMountainJagged
MountainNichols
Hills
Tununak
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Toksook Bay
Nightmute
Chefornak
Kipnuk
Mekoryuk
Newtok
Kongiganak
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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
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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Wilson, F.H., 1977Wilson, F.H., and Hults, C.P., 2006, Unpublished data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Wilson, F.H., and Hults, C.P., 2006, Unpublished dataCAPE MENDENHALL QUADRANGLE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Wilson, F.H., 1977Wilson, F.H., and Hults, C.P., 2006, Unpublished data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
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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
!(
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Saint George
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169°30'W
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169°45'W
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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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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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Chert and argillite
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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
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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