u.s. geological survey open-file report 99-317, mapqm qa qa qa qa qmt qa tm qmt qa qm qm qm qm qa qa...

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Qm Qa Qm g Qv Qa Qm Qv Qv g g Qv Qb Qv Qv Qaf Qb Qv Qv Qv Qm Tbe Qm Qa QTv Qb Tmr Qm QTv Qpd QTv Qm Qa Qv Qpd Qa Qa Tbe Qi Qv Qm Qi Qb Tbe Qa QTv Qm Qa Qa Tv QTv Qa Tta Qm Qa Tta Qa Tv Qa Tta Tiu Tv Qpd Qv Tv Tbe Qm Qv Qv QTv QTv Qv QTv Qpd Tiu QTv QTv Tbe Qv Qv Qv Qpd QTv Qpd Qpd QTv Qv Qmt Qb Tg Qm Qm Qa Qm QTv Qm Qm Qm Qa Qm Qm Qm Qv Qm Qm Qm g Qa Qv QTm Qa Qa QTv QTv Qv Qv Qpd Qv QTv g Tmr Qv QTv QTv Qv Tmr Qv Qv g Qa Qa Qv Qm Tbe Tmr Qpd Qm Qa g QTv Tbe Tbe Qpd Ti Qa QTv Ti Tbe Tbe Qa Qa Qa Qb Qm Qa Qa Qm Qa Qa Qm QTm Qm Qm Qm Qa Qm Qa QTv Qm Qm Qm Qpd Qm Qv QTv Qm Qm Qa Qa QTv QTv QTv QTv QTv Qv Qm Qpd Qm Qv Qm QTv Qv Qv Qv Qa Qm Qv g Qa Qa Qpd QTv g Qm Qpd Tbe Qb Qv Qpd Tbe Tbe QTv Qpd Qv Qpd QTv Qpd Qa Qa Tbe Qpd Qmt Tbe Qmt Ks Qa Qm Qa Qa Qa Qm Qm Qa Qm Qm SEDIMENTARY ROCKS AND SURFICIAL DEPOSITS Qa Alluvial deposits Qaf Alluvial fan and landslide deposits Qb Marine beach and estuarine deposits Qmt Marine terrace deposits Qm Moraines and other glacial deposits TERTIARY Tmr Milky River Formation Tbl Bear Lake Formation Tta Tachilni Formation Tu Unga Formation Tbe Belkofski Formation Th Hemlock Conglomerate Ts Stepovak Formation Tt Tolstoi Formation Tc Copper Lake Formation CRETACEOUS Kh Hoodoo Formation Kc Chignik Formation Kk Kaguyak Formation Ks Shumagin Formation Ksm Mudstone Kp Pedmar Formation KJcv Chert and volcanic sequence Khe Herendeen Formation Kst Staniukovich Formation SEDIMENTARY ROCKS (continued) JURASSIC Jn Naknek Formation Jni Indecision Creek Sandstone Member Jnk Katolinat Conglomerate Member Jns Snug Harbor Siltstone Member Jnn Northeast Creek Sandstone Member Jnc Chisik Conglomerate Member Js Shelikof Formation Jk Kialagvik Formation Jt Talkeetna Formation TRIASSIC Trk Kamishak Formation PERMIAN Pls Limestone IGNEOUS ROCKS Volcanic Rocks QUATERNARY Qv Volcanic rocks Qpd Pyroclastic and debris-flow deposits QTv Volcanic rocks QTp Pyroclastic flow deposits QTm Morzhovoi Volcanics TERTIARY Tvu Volcanic rocks, undivided Tv Volcanic rocks Tm Meshik Volcanics TRIASSIC Trv Volcanic rocks PERMIAN Pv Volcanic rocks IGNEOUS ROCKS (continued) Intrusive Rocks QUATERNARY Qi Intrusive rocks TERTIARY Ti Intrusive rocks Tiu Intrusive rocks, undivided Tgd Granodiorite, Mt. Katmai region Tqd Quartz diorite, Mt. Katmai region Tg Granodiorite, Shumagin, Semidi, and Sanak Islands JURASSIC Jgd Granodiorite Jgr Granite Jqd Tonalite and quartz diorite Jgb Diorite and gabbro METAMORPHIC ROCKS QUATERNARY or TERTIARY QTc Contact-metamorphic rocks MESOZOIC JPk Kakhonak Complex Trc Cottonwood Bay Greenstone OTHER MAP SYMBOLS g Glaciers Water Altered zones Hornfelsed zones. Folds -- Certain Folds -- Inferred Folds -- Concealed Stratigraphic contacts -- Certain Stratigraphic contacts -- Approximate Stratigraphic contacts -- Approximate, queried Stratigraphic contacts -- Concealed Internal contacts Faults -- Certain Faults -- Approximate Faults -- Approximate, queried Faults -- Concealed Thrust faults, teeth on upper plate -- Certain Thrust faults, teeth on upper plate -- Approximate Thrust faults, teeth on upper plate -- Approximate, queried Thrust faults, teeth on upper plate -- Concealed Dikes Caldera or crater rim Ice contacts and shorelines Geology mapped by Narin Albert, 1983; W.H. Allaway, Jr., 1980-81; L.M. Angeloni, 1983-85; Peter Burrell, 1983; J.E. Case, 1977-81, 1983-1985; C.L. Connor, 1982; D.P. Cox, 1977-78, 1980; John Decker, 1985; R.L. Detterman, 1977-86, 1988; G.D. DuBois, 1985, 1988, 1990; C.L. Engelhardt, 1977; B.M. Gamble, 1983-84; S.A. Zurinski, 1986; C.D. Holloway, 1977; D.G. Howell, 1977; T.E.C. Keith, 1984; L.B. Magoon, 1979-80; Louie Marincovich, Jr., 1978, 1982, 1984; Eric Martin, 1984; Hugh McLean, 1977; J.W. Miller, 1979-86; T.P. Miller, 1973-75, 1977-78, 1979, 1981-82, 1988; M.A. Pernokas, 1983; B.L. Reed, 1983-84; J.R. Riehle, 1981-86; Nora Shew, 1981-82; R.A. Spicer, 1977-78; F.R. Weber, 1983-85; F.H. Wilson, 1977-86, 1988, 1990; J.A. Wolfe, 1977-78; M.E. Yount 1977-86. Data sources (by 1:250,000-scale quadrangle): Afognak: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; R.L. Detterman, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989 Bristol Bay: Detterman and others, 1987a, b; R.L. Detterman written commun., 1988 Chignik: Detterman and others, 1981a, b; R.L. Detterman written commun., 1988 Cold Bay: Kennedy and Waldron, 1955; Waldron, 1961; Burk, 1965; McLean and others, 1978; DuBois and others, 1989; F.R. Weber, written commun., 1989; T.P. Miller, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989-91; field work, F.H. Wilson, G.D. DuBois, and W.H. White, 1990 False Pass: Kennedy and Waldron, 1955; Waldron, 1961; Burk, 1965; McLean and others, 1978; DuBois and others, 1989; F.R. Weber, written commun., 1989; T.P. Miller, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989-91; field work, F.H. Wilson, G.D. DuBois, and W.H. White, 1990 Karluk: Detterman and others, 1987a, b; R.L. Detterman, written commun., 1988 Mt. Katmai: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; R.L. Detterman, written commun., 1989; interpretation of SLAR and Landsat imagery, F.H. Wilson, 1989 Naknek: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; Muller, 1952; interpretation of SLAR and Landsat imagery, F.H. Wilson, 1989 Port Moller: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989 Simeonof Island: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989 Stepovak Bay: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989 Sutwik Island: Detterman and others, 1981a, b; R.L. Detterman written commun., 1988 Ugashik: Detterman and others, 1987a, b; R.L. Detterman written commun., 1988 Base digitally derived from following U.S. Geological Survey 1:250,000-scale quadrangles, and contained 1:63,360-scale quadrangles in part, Afognak, 1952 (revised 1970); Bristol Bay, 1963 (revised 1977); Chignik, 1963 (revised 1976); Cold Bay, 1943 (revised 1975); False Pass, 1949 (revised 1970); Karluk, 1952 (revised 1981); Mt. Katmai, 1951 (revised 1975); Naknek, 1952 (revised 1981); Port Moller, 1953 (revised 1988); Simeonof Island, 1963; Stepovak Bay, 1963 (revised 1981); Sutwik Island, 1963; Ugashik, 1963 (revised 1975). Vicinity of Morzhovoi Bay to False Pass digitally derived from National Oceanic and Atmospheric Administration Chart 16535, Morzhovoi Bay and Isanotski Strait (Mercator Projection). Inset map digitally derived from Karluk (C-4 and C-5), Alaska, quadrangle, scale 1:63,360. USGS quadrangle sheets digitally transformed from: Universal Transverse Mercator projection, zones 3, 4, and 5 to: Albers Equal Area projection, 1st Standard Parallel; 55 degrees N 2nd Standard Parallel; 65 degrees N Central Meridian; 154 degrees W Projection origin; 50 degrees N Scale 1:500,000 By GEOLOGIC MAP OF THE ALASKA PENINSULA, SOUTHWEST ALASKA F.H. Wilson, R.L. Detterman, and G.D. DuBois LIST OF MAP UNITS LIST OF LINE SYMBOLS U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 99-317

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Page 1: U.S. Geological Survey Open-File Report 99-317, mapQm Qa Qa Qa Qa Qmt Qa Tm Qmt Qa Qm Qm Qm Qm Qa Qa Qa Jt Jt Tgd Tm Qm Jnc Qa Qa Jnn Qa Qm Qa Tc Qm Qa Tm Jt Qa Kk Qa Khe Tgd Kk Qm

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Qm SEDIMENTARY ROCKS AND SURFICIAL DEPOSITS

Qa Alluvial deposits

Qaf Alluvial fan and landslide deposits

Qb Marine beach and estuarine deposits

Qmt Marine terrace deposits

Qm Moraines and other glacial deposits

TERTIARY

Tmr Milky River Formation

Tbl Bear Lake Formation

Tta Tachilni Formation

Tu Unga Formation

Tbe Belkofski Formation

Th Hemlock Conglomerate

Ts Stepovak Formation

Tt Tolstoi Formation

Tc Copper Lake Formation

CRETACEOUS

Kh Hoodoo Formation

Kc Chignik Formation

Kk Kaguyak Formation

Ks Shumagin Formation

Ksm Mudstone

Kp Pedmar Formation

KJcv Chert and volcanic sequence

Khe Herendeen Formation

Kst Staniukovich Formation

SEDIMENTARY ROCKS (continued)

JURASSIC

Jn Naknek Formation

Jni Indecision Creek Sandstone Member

Jnk Katolinat Conglomerate Member

Jns Snug Harbor Siltstone Member

Jnn Northeast Creek Sandstone Member

Jnc Chisik Conglomerate Member

Js Shelikof Formation

Jk Kialagvik Formation

Jt Talkeetna Formation

TRIASSIC

Trk Kamishak Formation

PERMIAN

Pls Limestone

IGNEOUS ROCKS Volcanic Rocks QUATERNARY

Qv Volcanic rocks

Qpd Pyroclastic and debris-flow deposits

QTv Volcanic rocks

QTp Pyroclastic flow deposits

QTm Morzhovoi Volcanics

TERTIARY

Tvu Volcanic rocks, undivided

Tv Volcanic rocks

Tm Meshik Volcanics

TRIASSIC

Trv Volcanic rocks

PERMIAN

Pv Volcanic rocks

IGNEOUS ROCKS (continued)

Intrusive Rocks

QUATERNARY

Qi Intrusive rocks

TERTIARY

Ti Intrusive rocks

Tiu Intrusive rocks, undivided

Tgd Granodiorite, Mt. Katmai region

Tqd Quartz diorite, Mt. Katmai region

Tg Granodiorite, Shumagin, Semidi, and Sanak Islands

JURASSIC

Jgd Granodiorite

Jgr Granite

Jqd Tonalite and quartz diorite

Jgb Diorite and gabbro

METAMORPHIC ROCKS

QUATERNARY or TERTIARY

QTc Contact-metamorphic rocks

MESOZOIC

JPk Kakhonak Complex

Trc Cottonwood Bay Greenstone

OTHER MAP SYMBOLS

g Glaciers

Water

Altered zones

Hornfelsed zones.

Folds -- Certain

Folds -- Inferred

Folds -- Concealed

Stratigraphic contacts -- Certain

Stratigraphic contacts -- Approximate

Stratigraphic contacts -- Approximate, queried

Stratigraphic contacts -- Concealed

Internal contacts

Faults -- Certain

Faults -- Approximate

Faults -- Approximate, queried

Faults -- Concealed

Thrust faults, teeth on upper plate -- Certain

Thrust faults, teeth on upper plate -- Approximate

Thrust faults, teeth on upper plate -- Approximate, queried

Thrust faults, teeth on upper plate -- Concealed

Dikes

Caldera or crater rim

Ice contacts and shorelines

Geology mapped by Narin Albert, 1983; W.H. Allaway, Jr., 1980-81; L.M. Angeloni, 1983-85; Peter Burrell, 1983; J.E. Case, 1977-81, 1983-1985; C.L. Connor, 1982; D.P. Cox, 1977-78, 1980; John Decker, 1985; R.L. Detterman, 1977-86, 1988; G.D. DuBois, 1985, 1988, 1990; C.L. Engelhardt, 1977; B.M. Gamble, 1983-84; S.A. Zurinski, 1986; C.D. Holloway, 1977; D.G. Howell, 1977; T.E.C. Keith, 1984; L.B. Magoon, 1979-80; Louie Marincovich, Jr., 1978, 1982, 1984; Eric Martin, 1984; Hugh McLean, 1977; J.W. Miller, 1979-86; T.P. Miller, 1973-75, 1977-78, 1979, 1981-82, 1988; M.A. Pernokas, 1983; B.L. Reed, 1983-84; J.R. Riehle, 1981-86; Nora Shew, 1981-82; R.A. Spicer, 1977-78; F.R. Weber, 1983-85; F.H. Wilson, 1977-86, 1988, 1990; J.A. Wolfe, 1977-78; M.E. Yount 1977-86.

Data sources (by 1:250,000-scale quadrangle):Afognak: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; R.L. Detterman, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989

Bristol Bay: Detterman and others, 1987a, b; R.L. Detterman written commun., 1988

Chignik: Detterman and others, 1981a, b; R.L. Detterman written commun., 1988

Cold Bay: Kennedy and Waldron, 1955; Waldron, 1961; Burk, 1965; McLean and others, 1978; DuBois and others, 1989; F.R. Weber, written commun., 1989; T.P. Miller, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989-91; field work, F.H. Wilson, G.D. DuBois, and W.H. White, 1990

False Pass: Kennedy and Waldron, 1955; Waldron, 1961; Burk, 1965; McLean and others, 1978; DuBois and others, 1989; F.R. Weber, written commun., 1989; T.P. Miller, written commun., 1989; interpretation of vertical airphoto, SLAR, and Landsat imagery, F.H. Wilson, 1989-91; field work, F.H. Wilson, G.D. DuBois, and W.H. White, 1990

Karluk: Detterman and others, 1987a, b; R.L. Detterman, written commun., 1988

Mt. Katmai: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; R.L. Detterman, written commun., 1989; interpretation of SLAR and Landsat imagery, F.H. Wilson, 1989

Naknek: Riehle and others, 1987, 1993; Riehle and Detterman, 1993; Muller, 1952; interpretation of SLAR and Landsat imagery, F.H. Wilson, 1989

Port Moller: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989

Simeonof Island: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989

Stepovak Bay: Wilson and others, 1995; field work, F.H. Wilson, G.D. DuBois, R.L. Detterman, and W.H. White, 1989

Sutwik Island: Detterman and others, 1981a, b; R.L. Detterman written commun., 1988

Ugashik: Detterman and others, 1987a, b; R.L. Detterman written commun., 1988

Base digitally derived from following U.S. Geological Survey 1:250,000-scale quadrangles, and contained 1:63,360-scale quadrangles in part, Afognak, 1952 (revised 1970); Bristol Bay, 1963 (revised 1977); Chignik, 1963 (revised 1976); Cold Bay, 1943 (revised 1975); False Pass, 1949 (revised 1970); Karluk, 1952 (revised 1981); Mt. Katmai, 1951 (revised 1975); Naknek, 1952 (revised 1981); Port Moller, 1953 (revised 1988); Simeonof Island, 1963; Stepovak Bay, 1963 (revised 1981); Sutwik Island, 1963; Ugashik, 1963 (revised 1975).

Vicinity of Morzhovoi Bay to False Pass digitally derived from National Oceanic and Atmospheric Administration Chart 16535, Morzhovoi Bay and Isanotski Strait (Mercator Projection).

Inset map digitally derived from Karluk (C-4 and C-5), Alaska, quadrangle, scale 1:63,360.

USGS quadrangle sheets digitally transformed from: Universal Transverse Mercator projection, zones 3, 4, and 5 to: Albers Equal Area projection, 1st Standard Parallel; 55 degrees N 2nd Standard Parallel; 65 degrees N Central Meridian; 154 degrees W Projection origin; 50 degrees N

Scale 1:500,000

By

GEOLOGIC MAP OF THE ALASKA PENINSULA, SOUTHWEST ALASKA

F.H. Wilson, R.L. Detterman, and G.D. DuBois

LIST OF MAP UNITSLIST OF LINE SYMBOLS

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

OPEN-FILE REPORT 99-317