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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