! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( ! ( 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 Great Ridge Greenstone Ridge WOOD RIVER MOUNTAINS KUSKOKWIM MOUNTAINS KILBUCK MOUNTAINS WOOD RIVER MOUNTAINS A H K L U N M O U N T A I N S Gemuk Mountain Fisher Dome Mount Oratia Mount Waskey Thumb Mountain Mount Plummer Aeolus Mountain Downdraft Mountain Red Mountain Susie Mountain Chagvan Mountain Tokomarik Mountain Jagged Mountain Nichols Hills Tununak Umkumiut Toksook Bay Nightmute Chefornak Kipnuk Mekoryuk Newtok Kongiganak Kwigilligok Tuntululiak Eek KUSKOKWIM BAY Kasigluk Nunapitchuk Atmautluak Akrachak Akiak Kwethluk Bethel Oscarville Napaskiak Napakiak Clarks Point Ekuk Manokotak Twin Hills Togiak Platinum Goodnews Bay Quainhagak B E R I N G S E A HAZEN BAY ETOLIN STRAIT K U S K O K W I M R I V E R BAIRD INLET Nunavakpak Lake K w et h luk R i v e r E e k R i v e r C r ook e d C re e k Aniak Lake Upnuk Lake Kisaralik Lake Chikuminuk Lake Lake Chauekuktuli Nuyakuk Lake Lake Nerka Togiak Lake Lake Aleknagik Goodnews Bay Ualik Lake Jacksmith Bay Ka nt e kt ok R i ve r T o g i a k R i v er Hagemeister Strait Togiak Bay Kulukak Bay Security Cove Chagvan Bay Ma t o g a k R i v e r Metervik Bay Nushugak Bay Lake Nunavaugaluk M ar v e l C r e e k N a y o r u ru n R i v e r BRI S T OL BA Y I g u s h i k R i v e r W e a r y R i v e r N U S H U G A K R I V E R Ahzwiryuk Bluff Bi na k s l i t B l u f f T I K C H I K L A K E S NUSHAGAK PENINSULA M I L K C R E E K F A U L T M T O RA T I A FA U L T T R A I L C R E E K FA U LT G O L D E N G A T E F A U L T T O G I A K - T I K C H I K F A U L T G O O D N E W S FA U L T R I G H T H A N D F A U LT E A S T K U L U K A K F A U LT K U L U K A K F A U L T H A G E M E I S T E R F A U L T L AKE CRE EK FAUL T Pyrite Point Cape Peirce Cape Newenham Hagemeister Island Crooked Island Summit Island Right Hand Point Cape Constantine Nelson Island Nunivak Island High Island W a l r us Isl a n d s Round Island J^ot Pls TKpm TKgd TKg TKg TKg TKqd TKg TKg TKg TKg TKg TKg TKg TFi TKqd Kjb TKqm ^vs Jum Pls Pls TKqm TKqm TJih Ksp ^v TKm TKgd TKg Jgb Jum Jum TKm Jgb <km <km Pls TKqd TKqd Tnba TKr Ksp Qts Qg TKa Kkn Kkn Kkn Ksp Tnba TKqm TKg TKg TKgd Kkn Kkn Kkn <k Kkn Ksp <k Kk Kk Jgb Jgb Jgb Pls Pls Klg Klg Klg TKm Jgb TKg ^og ^og Pls Pls Jum ^og Jum Jum J^cs J^mv J^mb Jum ^ob ^od ^ob Ks Jln Ks Kv Jmm Kv Qgm Qgm Talb Talb Kkn TKr TKr TKr ^vs TKr Pls Pls Pls Pls Pls Pls Jum Jtr Jum Jum DOl Pls Pls Jgb Pls Pvs Pv Pv ^Pmb Jum Kv Qvb Ks Jlt Tfi Tfi Qgm ^og J^mb Qs ^Pmb ^Pmb Kv Qa Qa Jmm TKg DOl <km Pls MDm }|m Kkn }|s }|s }|c TKqd Kvm Kv TKr TKgr Jum Kv Qg Qgm Qtf Qgm Qtf Qg Qed Qb Qa Qg Qg Qg Jmm Qg Qes Tfi TKgs Jmm Qa Qg Jkw Qa Qs Qes Qa Qg Qg Jkw Qg Qes Qg Qes Qg Jmm Qg Qtf Qes Qes Qg Qmt Qg Qs Jlvs Ks Jlt Tfi Qg Qgo Qa Jmv Qtf Jlgd Qg Ks Jmv Qg Kv Qg Qg Qa Qvb Jvt Qg Qg Ks ^od Jmv Qg J^ot ^Pcs Jum ^Pmb ^od ^og ^Pmb ^ob Qs Qgo Qs Kv Kv ^og ^ob ^od ^ob Qg Qtf Qgo ^od Qa Qgo ^ob Jgb ^Pmb ^ob Jvt Qs ^ob Qa Qgo ^Pvs Qgo Jgb Qa Jum J^cv ^Pmb Qg ^ob Qg ^Pvs Qg Qa Qg Jln J^cv Qa Qgo Qgo Qg Qgo Qg Jln Qes Qg Qg Jmm Qg Jlt J^cv TKqd TKgd TKgd TKgd TKqm TKqm TKgs TKgr Qa Qa Qg Jvt Qg Jlt Qvb Qgo Qa Qgo Pv Pvs Qg Qg Qsd Qa Qg Qgo Qtf Qa Qg Qg Qg Qg Qg Qgo Qg Qg Qg Qa Qg Qg Qg Qg Qg Qg Qgo Qg Qa Qgo Qg Qg Qgo Qg Qg Qg Qgo Qg Qg Qg Qg Qg Qa Qgo Qg Qgo Qg Qg Qgo Qg Qgo Qa Qa Qgo Qa Qsd Qs Qgo Qg Qg Qsd Qgo Qgo Qa Qg Qa Qg Qgo Qa Qa Qgo Qg Qg Qg Qg Qs Qs Qg Qgo Qg Qg Qg Qg Qsd Qs Qg Qrs Qg Qg Qgo Qgo Qa Qg Qsd Qg Qa Qg Qgo Qg Qg Qg Qsd Qg Qgo Qa Qg Qtf Qa Qg Qg Qa Qg Qg Qa Qg Qg Qg Qg Qg Qg Qg Qg Qs Qsd Qgo ^ob Jlt? Jgb Pls Jgb ^Pmb J^cv Pvs ^Pvs Jkw Pvs Pvs Pv Kgbr? J^cv Jln ^Pvs TKg Pv Jkw Jln ^Pvs Jvt? J^cv Jln Jlt Kgbr J^cv Jkw Jlt ^Pmb Jlt J^cv Jkw Kgbr Jkw K^vs K^vs K^vs DOl Pv }|t K^vs K^vs Jkw }|t Jkw }|t K^vs }|t K^vs K^vs }|t K^vs Kvm }|t K^vs Qvb K^vs K^vs }|t K^vs K^vs Jum }|t Jkw Kvm Jgb TKg Jgb DOl }|t K^vs }|t K^vs K^vs Jkw K^vs }|t }|t <km ^Pcs }|t }|t K^vs Kvm K^vs K^vs ^Pcs <k }|t }|t K^vs K^vs }|t }|t K^vs }|t Kvm <k Kcgc K^vs }|t <k Kk K^vs TKgr ^vs }|t TKg }|t Pls Kvm K^vs DOl }|t Kvm }|t Kcgc K^vs }|t <k ^vs K^vs }|t Kcgc K^vs Kk Kvm DOl K^vs K^vs Kk DOl }|t <k K^vs Kvm Kk K^vs K^vs Kk }|t Kvm }m Kvm }|t Kvm }m Kvm Kk }|t Kk <k Kvm }|t Pls }m Pv ^vs K^vs K^vs K^vs K^vs Kk Kk Kcgc Kk Kkn Kvm Qg K^vs Qg Qg KJc Kvm Qgo Qa Qg Kk KJc Qg Qgo Kk Qgo Qsd <k Qgo Kkn TKa Kkn Kk Qs Jvs J^p Kvm }m Qgo MDv Qa Ja Qg Ja Qs Kk KJc Kkn Qgo Qg Qg Qgo Qa Qa Qg MDv Ja Qg }|p Pcs Qg Kkn Jgs Qg Jvs Qgo Jvs }|v Qgo J^p Kkn Ja Jgs Ja Qs Kkn Qgo Qs Kk Kkn Kk TKr TKa KJba Qg Qg Kkn Qg TKa TKa Tnr Qgo Qa Kk Tnr Qs Qa Tnba Qgo Qg Qgo Jvc Jab Jab TJis Kk Kk Kk Qs Jab Qa Qsd Qa Kk Kvm Kk Qgo Qrs Kk Qs Qa Qa Qa Qa TKgd TKgr Qrs Qrs Qrs Qrs Qrs Qs Qs Qs Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qgo Qa Qa Qa Qa Qg Qg Qsd Qsd Qsd Qsd Qsd Qsd Qsd Qsd Qsd Qsd Qsd Qg Qg Qg Qg Qg Qg Qg Qg Kk Kcgc Kk Kvm }|a Kkn Kvm KJc Kk TKqm Kk KJc Kv Kk }|s TKa Kk Kv Jab TJik Jvc TKa Jab TKr Kk Kk Jvc Kv Kg Jab Kk Kv Kk Kk Jvc Jab Kv Kk Kkn Kk Kv Kk Kk Kk Kk Kk TKqd Jab Kk Jvc Kvm TKgd Kv Kk Kv Kg Kk TKa TKa Jvc Jvc Jab TKr KJba Kkn KJc }m TKr TKr TKr Qtf Qtf Qsd Qb Qs Qmt Qs Qb Qtf Qa Qtf Qtf Qtf Qs Qs Qrs Qrs Qa QTv Qs Qa Qmt QTv Qmt Qa Qb Qmt Qs Qsd? Qmt Qa Qa Qs Qa Qa QTv Qs Qmt Qtf Qb Qmt Qmt Qmt Qs Qb Qs Qa Qcs Qvbm Qvb Qs Qs Qs Ttb Qvb Qs Qcs Qvb Qvbm Ttb Qb Qcs Qvb Qcs Qvbm Qcs Ttb Ttb Qvb Qcs Qvb Ttb QTab Kys Qvbm Qvbm Qs QTv Kys SCIENTIFIC INVESTIGATIONS MAP XXXX U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY RECONNAISSANCE GEOLOGIC MAP FOR THE KUSKOKWIM BAY REGION OF SOUTHWEST ALASKA Compiled by Frederic H. Wilson, Chad P. Hults, Solmaz Mohadjer, and Warren L. Coonrad 2007 DRAFT MAP 90% scale Hydrologic base information derived from U.S. Geological Survey 1:63,360 scale DLG files. Shaded relief derived from USGS 2 arc second NED files. Alaska Albers Equal Area projection. Index map, geographic setting of the Kuskokwim Bay region map area B R I ST O L B A Y BER I N G S E A BAIRD INLET BETHEL CAPE MENDENHALL GOODNEWS BAY HAGEMEISTER ISLAND KUSKOKWIM BAY NUNIVAK ISLAND NUSHAGAK BAY PRIBILOF ISLANDS ST MATTHEW SOURCES OF INFORMATION See References section for complete bibiographical information of published sources BETHEL QUADRANGLE 1:250,000 scale Box, S.E., Moll-Stalcup, E.J., Frost, T.P., and Murphy, J.M., 1993 Hoare, J.M., and Coonrad, W.L., 1959a Hoare, J.M., and Coonrad, W.L., 1978 Wilson, F.H., 1977 Wilson, F.H., and Hults, C.P., 2006, Unpublished data BAIRD INLET QUADRANGLE 1:500,000 scale Coonrad, W.L., 1957 1:250,000 scale Wilson, F.H., and Hults, C.P., 2006, Unpublished data CAPE MENDENHALL QUADRANGLE 1:250,000 scale Hoare, J.M., Condon, W.H., Cox, A., and Dalrymple, G.B., 1968 GOODNEWS BAY QUADRANGLE 1:250,000 scale Box, S.E., 1985a Hoare, J.M., and Coonrad, W.L., 1961b Hoare, J.M., and Coonrad, W.L., 1978 Wilson, F.H., 1977 Wilson, F.H., and Hults, C.P., 2006, Unpublished data 1:63,360 scale Hoare J.M., and Coonrad, W.L., field maps circa 1975 HAGEMEISTER ISLAND QUADRANGLE 1:250,000 scale Box, S.E., 1985a Hoare, J.M., and Coonrad, W.L., 1961a Hoare, J.M., and Coonrad, W.L., 1978 Wilson, F.H., and Hults, C.P., 2006, Unpublished data KUSKOKWIM BAY QUADRANGLE 1:500,000 scale Coonrad, W.L., 1957 1:250,000 scale Wilson, F.H., and Hults, C.P., 2006, Unpublished data NUSHAGAK BAY QUADRANGLE 1:250,000 scale Box, S.E., 1985a Hoare, J.M, and Coonrad, W.L, 1978 Wilson, F.H., Hults, C.P., and Coonrad, W.L., 2006, Unpublished data 1:63,360 scale Hoare, J.M, and Coonrad, W.L, field maps circa 1975 NUNIVAK ISLAND QUADRANGLE 1:500,000 scale Coonrad, W.L., 1957 1:250,000 scale Hoare, J.M., Condon, W.H., Cox, Allan, and Dalrymple, G.B., 1968 PRIBILOF ISLANDS QUADRANGLE 1:63,360 scale Barth, T.F.W., 1956 SAINT MATTHEW ISLAND QUADRANGLE 1:250,000 scale Patton, W.W., Jr., Miller, T.P., Berg, H.C., Gryc, George, Hoare, J.M., and Ovenshine, A.T., 1975 10 0 10 20 30 40 Miles SCALE 1:500 000 10 0 10 20 30 40 50 Kilometers ! ( Saint Paul Island Saint Paul Otter Island Qvs Qvs Qpd Qpd Qpd QTv Qed Qed 170°0' 170°0' 170°15' 170°15' 57°12' 57°12' 57°6' 57°6' SCALE 1:250 000 2.5 0 2.5 5 7.5 10 Miles ! ( Saint George Island Saint George Qvs T}p Tad Qpd Qpd QTv Qpd 169°30'W 169°30'W 169°45'W 169°45'W 56°36'N 56°36'N 56°30'N 56°30'N SCALE 1:250 000 2.5 0 2.5 5 7.5 10 Miles Saint Matthew Island SARICHEF STRAIT Hall Island Kygv TKgd TKgd Tvep Kv Kv TVep Kpd TVep Kpd Kv TKm TKgd Kv Kv Qs Kpd Tvep Qs Qs Kpd um Kv um Kpd Kv Kpd Tvep Kpd Kpd Qs Kpd Kpd Kpd Kpd 172°30' 172°30' 173°0' 173°0' 60°30' 60°30' 60°15' 60°15' 2.5 0 2.5 5 7.5 10 Miles SCALE 1:300 000 ALASKA CANADA RUSSIA MAP AREA Kg Kv Pv um ^v Ja <k }m Kk Ks Qg Qb Qa Qs ^ob Jtk Tnr Jgb Tad Jmv Tfi Jgs Jab Jum Ttb }|c Qcs }|v }|s Qvb }|m Qpd MDm QTv }|p Ksp Kpd Jln Jmm DOl TKm Jkw MDv Jvc Pcs Pvs Pls Jlt Jvt TKg ^vs <km J^p TKa }|a TKr Jvs KJb }|t T}p KJc ^og ^od Kvm Klg Kys Kkn QTs Qvs Qgo Qgm Qsd Qed Qmt Qes Qrs Qtf J^ot Talb ^Pcs ^Pvs ^Pmb KJba QTab TJik TJis Qvbm TJih TKqd TKgd TKqm J^cv TKgs TKgr Tvep Jlgd Tnba K^vs Kcgc Kgbr Kygv Glacial moraine Outwash deposits Chloritic phyllite Chert and argillite Arkosic sandstone and slate Marble and metabasaltic dikes Meta-chert and phyllitic meta-chert Basalt flows, Matuyama polarity epoch Volcaniclastic sandstone and argillite Granite Melange Limestone Monzonite Granodiorite Clastic rocks Pillow basalt Silt deposits Reworked silt Volcanic rocks Beach deposits Eolian deposits Marine terraces Basalt and chert Calcareous schist Pyroclastic rocks Alluvial deposits Phyllite and chert Estuarian deposits Metabasaltic schist Argillaceous melange Thin-bedded limestone Mafic intrusive rocks Greenstone and schist Basalt flows, undivided Coarse volcaniclastic rocks Glacial 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 argillite Marble 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 Island of 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 JURASSIC TERTIARY QUATERNARY CRETACEOUS TERTIARY TO JURASSIC TERTIARY AND (OR) CRETACEOUS METAMORPHIC ROCKS OF THE TOGIAK-TIKCHIK COMPLEX IGNEOUS ROCKS SEDIMENTARY ROCKS AND COONRAD (1979) TOGIAK-TIKCHIK COMPLEX UNCONSOLIDATED DEPOSITS OPHIOLITE COMPLEX OF BOX (1985a) KANEKTOK METAMORPHIC COMPLEX OF HOARE LIST OF MAP UNITS Pribilof Islands Town DRAFT MAP DRAFT MAP Tfi Ttb Talb Qvbm Qvb QTv Qcs Qpd QTab <km <k DOl MDm MDv Pls Pcs Pvs Pv }|a ^Pcs ^Pvs ^v ^og ^od ^ob ^vs J^ot J^p Jln }|p Jgs ^Pmb Jmm Jkw Jgs Jvt Ja Jvc }|p KJba K^vs }|c }|v }|s }|m }m }|t Kv Ksp Kpd Kv Kv TJik Kg T}p TJih TKm TKqd TKgd TKqm TKgs TKgr TKg TKa TKr Tad Tnba Tnr Tvep QTs Qvs Qgo Qgm Qmt Qes Qb Qg Qsd Qed Qrs Jvs J^cv Jlt KJb KJc Kygv Jlgd Jtk Jgb Jmv Jab Jum Kcgc Kvm Klg Kgbr Kkn Kys Kk Ks TJis Qa Qtf Qs CORRELATION OF MAP UNITS Unconsolidated deposits and sedimentary rocks Igneous rocks Togiak-Tikchik Complex Sedimentary and metamorphic rocks Ophiolitic 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 Metamorphic complex * Contact, dashed where approximate and inferred, dotted where concealed Fault, unknown displacement, dashed where approximate and inferred, dotted where concealed Normal fault, dashed where approximate and inferred, dotted where concealed + Thrust fault, dashed where approximate, dotted where concealed Shoreline or riverbank Ice contact Lineament + + List of Line Symbols Caldera or crater rim