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 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

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