Copyright 1984-2001 FileMaker, Inc. HBAM2016AUG95HPro 5.04group@the@unnamedcarbonaceousshalesandstoneandconglomerateofpro@@‚I‚@ @group@umargin@6onnorth-centralprinceofwalesislandunitconsistsofunn@others7siltstone@Otriassic@unfossiliferousmarbleonmainlandnorthwestofrevillagiged@@sedimentaryandvolcanicrocksundivided@@€@@R@.@@ndstoneandsiltstone@shaktolik@/tilltolstoilakeglaciation@volcaniclasticconglomeratesandstoneandshalenyacterrnae@7yukon-koyukukbasinsandstoneandsiltstone@2EH AK S B @EDE.@>DENDbEt@!D%€ E(€A+D*E)€A,€+E1€4D4E3€>A:D9E8€H@= @@0)hHBAM3016AUG95@‚Ã!HÃVIÃaLÃg`JÃPMÄ!jKÄ#aÄ#eÄ#Ä$Ä$aÄ'fÄ'sÄ4QÄ5Ä5Ä5Ä5Ä6QÄ6aÄ91QÄ93SÄ9QÄ9vPÄ9wNÄ9OÄ:1Ä:a}Ä:dÄ:Ä:Ä:ÄEÄE!ÄG1ÄJÄQYÄT1ÄU1XÄUTÄUVÄUWÄUUÄV2sÄa!nÄa"pÄboÄcuÄcqtÄcrÄcqÄhv\ÄhwZÄi![ÄiÄjA`ÄqA^ÄqB]ÄqwÄtQ_Äw'zÄw(vÄw)gÄw*hÄwlÄwjÄx#kÄxAÄxQiÄxaÄymÄz9cÄzC{{QWYW1973QWRWSW1974RW1975IWNWWWXW_WaWbWdWeWfWgWhW1976JWWWXW1977NWQWRWSWWWXWjW1978IWKWLWNWOWPWQWRWUWVWWWZW[W\WaWbWdWfWhWjW1979LWNWOWPW1980NWVWXW1981IWZW`WbW1982KWUWVWWWYW\WdW3‚rA5270ADiverse assemblage of sedimentary and volcanic rocks and their metamorphic equivalents. Found near British Columbia-Alaska border northeast of Revillagigedo Island (Berg and others, 1978, 1988; Elliott and Koch, 1981) and east of Juneau (Souther and others, 1979; Souther, 1971). Unit consists of (1) unnamed Middle Jurassic rhyolite and andesite; (2) Lower Jurassic andesite, basalt, conglomerate, and sandstone of the Hazelton Group; (3) Upper Triassic andesite and clastic sedimentary rocks rhyolite and andesite; (2) Lower Jurassic andesite, basalt, conglomerate, and sandstone of the Hazelton Group; (3) Upper Triassic andesite and clastic sedimentary rocksrocksh‚HA100BUnnamed lacustrine, fluvial, colluvial, glacial, beach, and marine deposits that are found in many areas of southeastern AlaskaCQsD QuaternaryESurficial sedimentary deposits FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚IA450AEdgecumbe Volcanics (basalt, andesite, and dacite) on Kruzof Island (Loney and others, 1975) and unnamed basaltic to rhyolitic rocks on islands west of Prince Wales Island (Eberlein and others, 1983), on Revillagigedo Island and mainland to east (Berg and others, 1978, 1988), Alaska-British Columbia border east of Wrangell Island (Elliott and Koch, 1981), and on Zarembo, Kuiu, and Kupreanof Islands (Brew and others, 1984). Rocks of Holocene age were recognized east of Wrangell Island (ElliElli06€yA1254DMiocene and Oligocene EGabbro 4E Pro 3.0 - 4.0F!V6V6P2(2( 8J_Aw xH 9/15/2006@ AGE DESCRIPTIONLABELNAMENSACLASS OVERPRINTSOURCESSYMBOLDAnsaclassB GA descriptionB GAlabelB GAageB GAnameB GAsourcesB GAsymbolB GA overprintB G A map labelB G H Pro 5.0 - 6.0M1,,./: AM PM PMYyTtNnFfNALL ODBF P^SundayMondayTuesday WednesdayThursdayFridaySaturdayJanuaryFebruaryMarchAprilMayJuneJulyAugust SeptemberOctoberNovemberDecemberQ1Q2Q3Q4 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter,  , X5{iD  jD{wHEkD {8 A $,.YesNo/,  , : AM PMB  C $,.YesNo/,  , : AM PMD  E $,.YesNo/,  , : AM PMF  G $,.YesNo/,  , : AM PMH  I $,.YesNo/,  , : AM PMJ   K $,.YesNo/,  , : AM PML  MN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMQR $,.YesNo/,  , : AM PM ! S $,.YesNo/,  , : AM PMT $,.YesNo/,  , : AM PMV  $,.YesNo/,  , : AM PMW  X  $,.YesNo/,  , : AM PMY    $,.YesNo/,  , : AM PM  BnsaclassDlabelFnameHageJ descriptionLsources A AWsymbolY overprint @BBA$ $B1*     @@B s@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PM    70SunMonTueWedThuFriSatJanFebMarAprMayJunJulAugSepOctNovDecArial MS Sans Serif @$A1$FPTH*SPATNAME WSPCFPTHA*Data-00:FHW Shared Folder Copy:nnsakey.FP5*NAMEA nnsakey.FP5 SPATAData-00:FHWSHA~1:nnsakey.FP5WSPCAD:\FHW Shared Folder Copy\A1RPTH RolyNAME WSPC"NAMEA SEunits.fp5 RPTHA SEUNITS.FP5 RolyAWSPCA"K:\chults\South East\SE Database\"!@A*FMRLFMRLAA3FMRLFMRLA AnnsakeyBunits`IItp‚}Bllite, tuff, greenstone, graywacke, chert, limestone, marble, phyllite, schist, and minor granitic rocks. Fossils from blocks are Early Cretaceous, Late Jurassic (?) or Triassic (?) in age (Loney and others, 1975; Johnson and Karl, 1985). Minimum age of unit is constrained by (1) mid-Cretaceous potassium-argon apparent ages on metamorphic minerals in the melange on Chichagof Island (Decker and others, 1980); (2) Early Cretaceous fossils in sedimentary matrix material near Sitka on Baranof CIsland (Plafker and others, 1976); and (3) Early Cretaceous fossils in matrix material near the coast northwest of Cross Sound (Plafker and others, 1977; George Plafker, written commun., 1984). Cretaceous age assigned to unit refers to time during which melange is interpreted to have formed. Metamorphic grade is primarily subgreenschist, greenschist, and, south of Cross Sound, glaucophane-schist facies (Decker and others, 1980). On Chichagof Island, unit consists of the Khaz Formation, whi @P @ @@0@0G‚FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A3900AHornblende and biotite diorite (Jualin Diorite) along east shore of Lynn Canal (Knopf, 1911; Redman, 1984a). The diorite produces a hornfelsic aureole in adjacent metasedimentary and metavolcanic rocks of probable Triassic or Permian age (unit KPsv) and is overlain unconformably by less metamorphosed Cretaceous and Jurassic sedimentary rocks (KJs) (Redman, 1984a). These relations suggest an emplacement age of Jurassic and (or) Triassic for the Jualin Diorite. As discussed above for CretaceBous to Permian sedimentary and volcanic rocks (KPsv), these relations also suggest that some rocks in the Cretaceous to Permian units (units KPsv, KPs, KPv, KPsvc) were metamorphosed and deformed prior to deposition of the Cretaceous and Jurassic strata (units KJs, KJv, and KJsv)CJTrdDJurassic and (or) Triassic *‚BHornblende diorite and gabbro that grades laterally into granodiorite and quartz diorite (unit Kgt). Potassium-argon ages are Late Cretaceous (Redman and others, 1984). Found in the Haines areaCKdbD CretaceousEDiorite and gabbroFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2495AUltramafic intrusive bodies of magnetite-bearing hornblende clinopyroxenite and subordinate dunite, peridotite, and hornblendite (Taylor, 1967). Several complexes are concentrically zoned from a core of dunite to rocks containing progressively less olivine and more hornblende and magnetite. Zoned bodies commonly intrude a two-pyroxene gabbro known to be of Late Triassic age on Duke Island (Gehrels and others, 1987). Geologic and geochemical considerations suggest that rocks in these bodies  RD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PM RI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM  $,.YesNo/,  , : AM PM  @BBA                       Gthe@thin-bedded@rtopsy@9type@unit@Odukeislandirvine1974andpercyisl@=ÄzH@)ą#a@71971@197811979@V1983@1986@%2@addicott@ age@ages@land&andesite@Bannette@apparent@jas@basaltic@bay@Iberners@nblack@-brew@cape@scarnian@clasts@'conodonts@@conspicuous@correlative@{crinoidal@"deposition@`dodds@^east-central@Wequivalents@Uetolin@facies@cfossils@g@Mgeochemical@graphitic@greenschist@a@a@al@granulite-facies@greenschist@acal@granulite-facies@greenschist@anulite-facies@greater@apart@parts@peratrovich@prior@;recognized@regionally@reported@sections@shallow-water@+siltstoneshalevolcanogenicgraywackeconglomerateandmino@sloko@subordinate@~thin-bedded@rtopsy@9 P_ABUUX  $,.YesNo/,  , : AM PM/‚A1254ALayered and locally zoned bodies of two-pyroxene +/- olivine +/- biotite +/- hornblende +/- quartz gabbro and subordinate troctolite, peridotite, leucogabbro, diorite, and tonalite. Unit consists of stocks on Revillagigedo Island and adjacent mainland (Berg and others, 1978, 1988; Koch and Elliott, 1984), northern Kupreanof and Kuiu Islands (Brew and others, 1984), Chichagof Island (Johnson and Karl, 1985; Loney and others, 1975), and north of Cross Sound (Brew and others, 1978). Stocks oneridotite, leucogabbro, diorite, and tonalite. Unit consists of stocks on Revillagigedo Island and adjacent mainland (Berg and others, 1978, 1988; Koch and Elliott, 1984), northern Kupreanof and Kuiu Islands (Brew and others, 1984), Chichagof Island (Johnson and Karl, 1985; Loney and others, 1975), and north of Cross Sound (Brew and others, 1978). Stocks ons onYO ABCDEF HIJKLMNOPQSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}ނ߂ႀむ䂀傀悀炀肀邀ꂀ낀삀킀  !"$%&'()*+,-./0123456789:;>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefhijklmnopqrstuvwxz{|}~@EH 8AK S A!C@ DIN@‚IBIB‚IB‚LA‚M@E‚NBD‚O@F‚QACE‚RAC‚SA‚TA‚U@AF‚VB ‚WAC‚XBT‚YEf‚[A‚\A}C‚^@‚_@F‚aAd‚b@iA‚cA‚d@AhE‚eB‚fACF‚gB‚hAQF‚j@RAEC‚k@DBK‚lAFC‚mF‚nBD0FFk‚o@B/F ‚pBgF‚qBF‚rB‚sA‚tA‚uAeCE‚vAPC‚x@q‚yAC‚zB‚|AFt‚}B2DpF‚~Fo‚F ‚@ BC‚AAHP LaserJet 5/5M PostScriptw odXXP?Rp_A+RdB|Custom page 1|CCCustom page 2|CCCustom page 3|CCfA~0'd‚Sedimenatry rocks metavolcanic rocksvided c rockserocksdites N  $,.YesNo/,  , : AM PMA%K K% %; ;% % %d d% %' '% %  B% % %R  R% /. ‚A1250evilagigedo Island and adjacent area of mainland yield potassium-argon apparent ages of early Miocene and late Oligocene (Smith and Diggles, 1981), and large body (La Perouse gabbro) northwest of Cross Sound yields a 40Ar/39Ar apparent age of Oligocene (Loney and Himmelberg, 1983).  CTgbDMiocene and Oligocene EGabbro FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A12500 ‚zA66163). On northeastern Chichagof Island, strata were metamorphosed to hornblende-hornfels facies during emplacement of adjacent Cretaceous intrusive rocks (Loney and others, 1975). Metamorphism in Glacier Bay area is also interpreted to have occurred during Cretaceous time (Brew and others, 1978). CDOsvDDevonian to Ordovician E)Sedimetary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚zA6616% 2QWUWVWWWZW\WaWbWdWfWgWhWjWkWlWnWpWrW}WWWWWWWW3QWUWVWWWZW\WaWbWdWfWgWhWjWkWlWnWpWrW}WWWWWWWW30-31oW31oW4QWaWbWdWfWgWhWjWlWrWWWW40ar/39arWW5QWdWfWjWlWrWWWW6QWdWfW7QW73oW74nW8QW9QWaOWWWXW\WeWnWqWuWxW}WWWWWWWWWWWWWWWWWWWaheterogeneoussuiteofplutonsconsistingprimarilyofbioVabdOWabovePWoWpWWWWWWWWWaddicottJWadjacentQWRWUWcWpWvWyWWWWWWWWadmiraltyKWLWQWRWVWZW\WjWnWoWpWuWvWWWWWWaegerineWWWafterQWW/'‚pA5011AShale, mudstone, graywacke, andesitic or basaltic rocks, subordinate chert and carbonate rocks, and the regionally metamorphosed equivalents of these strata. Nature and age of metamorphism is similar to that described above for Cretaceous to Permian sedimentary rocks (KPs). Protolith age indicated by stratigraphic relations with sedimentary and volcanic rocks of Cretaceous to Permian age (units KPs and KPv). Stippled area in unit southeast of Revillagigedo Island represents metasedimentarys with sedimentary and volcanic rocks of Cretaceous to Permian age (units KPs and KPv). Stippled area in unit southeast of Revillagigedo Island represents metasedimentaryary A/;!/6/!/+G!/N6_Q_+lT; o}I BT ; # I >*;  D0Uy D~U D5 *; 0y ~ ) {`crinoidal^WnWcrossJWKWLWNWOWPW}WWWcrosscuttingoWWWcrudeWdaciteIWdaciticlWdallfWjWkWmWWWWWWWdark-grayWW_WzWWdatafWjWkWlWmWnWpWsWWWWWWWWWdatedWdavisXWdczWWdcgyW|WdeckerNW}WWWdeep-waterNWdeformationQWnWWdeformedNWOWQWSWUWYWlWnWoWpWuWWWWWWWdeformeddisruptedandmetamorphosedgraywackesiltstonemudVdeformeddisruptedandmetamorphosedmafictointermediateaVdegreenWdepositedXW_WeWeWC‚AMetasedimentary and metavolcanic rocks derived from pre-Tertiary sedimentary and volcanic rocks during regional amphibolite- and local granulite- facies metamorphism. Common rock types include pelitic, semipelitic, and quartzofeldspathic schist and gneiss, and subordinate amphibolite, quartzite, marble, and calc-silicate. Protoliths are interpreted to be argillaceous marine strata, limestone, chert, subordinate mafic to felsic volcanic rocks, and minor intrusive rocks. Areas in which thereB may be a significant proportionof unmapped Tertiary or Cretaceous intrusive rocks are shown with a stipple pattern. Such areas comprise migmatite map units in some reports cited in this study (for example, Brew and Grybeck, 1984; Brew and others, 1984; Brew and Ford, 1985). Minimum age of rocks in unit is constrained by crosscutting tonalitic bodies of Paleocene and Late Cretaceous age (unit TKt) in the Coast Mountains (Gehrels and others, 1984). Protolith ages of Cretaceous (?), Jurassic_*interpreted}WWWWWW1986UWaWbWeWkWWWWWWWWWWWW1987TWUWVWWWaWbWdWlWWWWWWWWWWW1987aaWbWeWjWkWlWWWWWWW1987bfWjWkWmWWWWW1988IWQWUWVWWW\WlWnWoWpWrWWWWWWWWWWWWWWWWZW\WaWbWdWfWgWhWjWkWlWnWpWrW}WWWW30-31oW31oW4QWRWaWbWdWfWgWhWjWlWrWW40ar/39arW5QWRWdWfWjWlWrWW6QWdWfW7QW73oW74nW8QW9QWaOWWWXW\WeWnWqWuWxW}WWWWWWWabdOWabovePWoWpWWaddicottJWadjacentQWRWUWcWpWvWyWWWadmiraltyKWLWQWRWVWZW\WjWnWoWpWuWvWafterQWWlB wandWWWWWWWWWWWWWWWWWWWWWWW@clastsgWWclinopyroxeneWWWclinopyroxeniteWcoarseeWcoastKWmWoW}WWWWWWWWcoatsNWcobblegWcoevalmWcolluvialHWcolumbiaIWpWvWyWzWWWcolumbia-alaskarWuWcommonNWOWVWnWoWtW}WWWWWWWcommonlyWcommunJWMWNWOWQWXWuW}WWWWWWWcomplexesWcomponentWcompositionallyWcompriseWcomprises}WconcentricallyWconcordantWconformableUWconglomerateJWLWMWNWQWTWVWZW\W]WaWcWeWfWgWhWjWlWnWrWtW|WconglomerateandsedimentarybrecciainterbeddedwithsandsteVconglomeraticeW weeWfWqWyWWWWwebsterWwereIWNWXWeWnWuWvWyWzWWWWWwernerWwestIWTW\WaWdWmWuWvWxW}WWwest-central]W^WaWbWdWwestern_WcWWcWWWW7lÄzHeÄzIdÄzJaÄzd|ÄzqfÄ1xÄAbÄyÄaÄÄÄbÄcZW\WaWbWdWfWgWhWjWkWlWnWpWrW}WW119oW13W1911QW1912QWRW1926QWRW1929QWRWTWnWoWpW1941NW1957QWSWtW1959\WdWfWhWuWvWxWyW{W1963dWfWhW|W1965KWLWQWRWVWZW\WjWtWuW1967QWTWUWVWWWZW[W\W`WfWwWxW1970W1971KWjWrWW1972QWYW1973QWRWSWnWoWpWW1974RWuWvW1975IWNWWWXW_WaWbWdWeWfWgWhWnWqWsWxWyWzW}W~WW1976JWWWXWqW}W1977NWQWRWSWWWXWjWnWoWpWqW}WW1978IWKWLWNWOWPWQWRWUWVWWWZW[W\WaWbWdWfWhWjWlWnWoWpWrWuWxWyWzW|WWW‚B may be genetically related to some Cretaceous and Jurassic volcanic rocks (KJv) (Berg and others, 1972; Irvine, 1973). Potassium-argon apparent ages of the ultramafic rocks indicate emplacement during Early Cretaceous time (Lanphere and Eberlein, 1966). Rocks belonging to this suite are found on (1) Duke Island (Irvine, 1967, 1974); (2) Annette and Revillagigedo Islands (Berg and others, 1978, 1988); (3) small islands west of Etolin Island (Himmelberg and others, 1986) and Kupreanof IslanCd (Brew and others, 1984); and (4) on mainland near Myers Chuck (Ruckmick and Noble, 1959), Tracy Arm (Brew and Grybeck, 1984), and Klukwan (MacKevett and others, 1974). Undated ultramafic rocks provisionally assigned to unit on the basis of similar lithic type are queried on geologic map and consist of (1) hornblendite and hornblende pyroxenite on Revillagigedo Island (Berg and others, 1978, 1988); (2) peridotite, dunite, and pyroxenite in Coast Mountains near Tracy Arm (Brew and Grybeck,shalyVWshear}WshearedqW}WshelterQWSWshore\WdWxWWshowWshownqWuWWsidepWsignificantnWqWuWWWsilberlingYW\WnWsiliceousfWsillsWsiltstoneJWLWNWQWTWVWZW]WaWcWeWWsiltstoneshalesandstonegraywackeandsubordinatelimestonaVsiltstoneshalevolcanogenicgraywackeconglomerateandminocVminocVcVcV[mafictointermediatevolcanicbrecciaagglomerateandflowsiVmagmaticWmagnetiteWWmagnetite-bearingWmainWWmakeQWmanyHWuWWmapQW\WnWpWuWvWyWzWWmappednW~WmarbleVWWW\WdWfWnWoWqWsWtWuWvWyWzW}WWWWWWWmarginnWmarincovichLWmarineHWJWLWNWQWeW}WWmarinegraywackeandmudstonesubordinateconglomerateandaQVmartinQWRWmassiveWW\W^WdWfWkWwWmassivelimestoneandminordolomitecontaininglight-grayc^Vmassivethintothick-beddedlocallyreefoidallight-graylifVmassivetothick-beddedlimestoneandminordolomiteinmostWVmategraywackenWmaterial}Wmatrix}WWmaximumqWmayKW\WlWnWoWpWqWuWxWzW|WWWWmcclellandVWdWWWmdsvuWWWmedium-bedded\W^Wmelange}W~WWnblackVWZWdWjWwWblackargillitegraywackecalcareoussiltstonechertandminZVblackshaleshalylimestonesiltstonesandstoneconglomerateVVblocks}WWbodiesnWoWWWWWWWWWWbodyWWWWWbokanWborderIWrWuWzW}WWWbounded}WbowserWbrady}WbrecciaKWTWUWXWaWbWcWeWgWiWjWkWlWtWwW}WWWbregQWQWQWQWWWWWWW0G‚APeralkaline aegerine and arfvedsonite granite (Bokan Mountain Granite) on southern Prince of Wales Island (MacKevett, 1963) that yielded Jurassic potassium-argon (Lanphere and others, 1964), uranium-lead (zircon) (Saint-Andre and others, 1983), and rubidium-strontium (Armstrong, 1985) apparent ages; and an undated body of nepheline-eudialyte-bearing syenite north of the Bokan Mountain Granite (Eberlein and others, 1983) suspected to be of Jurassic ageCJgrD Jurassic EGranite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000. ‚oFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚nFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚oA5105AAndesitic or basaltic flows and locally fragmental rocks, subordinate clastic strata and carbonate, and the metamorphosed and deformed equivalents of these rocks. Regional metamorphism of these strata is similar to that described above for Cretaceous to Permian sedimentary rocks (KPs). Common rock types in higher grade regions include schist, gneiss, and amphibolite, although some of this amphibolite may be metagabbro (see sedimentary and volcanic rock unit KPsv described below). GraphiticV 21978WWWWWWWWWWpo‚}Fafker, writtern commun., 1984) CKsvmD Cretaceous E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2953AIncludes mafic volcanic and metavolcanic rocks that resemble rocks in the Cretaceous sedimentary and volcanic rocks melange unit (Ksvm) in structural and metamorphic characteristics. Common lithic types include greenstone, greenschist, and minor phyllite, graywacke semischist, marble, and metachert. Age of formation of this melange unit is constrained by stratigraphic and structural similarities with rocks in associated Cretaceous melange units (units Ksvm and Ksm). Consists of the Waterfa&limitnWlineatedWlithicNWPWmW}WWWWlithicallyNWfWnWlocalWWWWWlocalitiesIWlocallyNWZWfWnWoWrWWWWWlocatednWloneyIWNWWWXW_WaWbWdWeWfWgWhWqWxWyWzW}WWWWWWWWWWWWlongfWkWmWlower[W\W]WaWbWdWeWfWhWjWkWmWrWtWwW|WWlowerpermianbasaltpartofthehalleckformationonnorthe[Vnorthe[V[V[V[V[V[V[V[V[V[V[V5|metasedimentaryNWlWnWpWqWrWuWWWWWWWWmetasedimentaryandmetavolcanicrocksderivedfrompre-ordoVmetasedimentaryandmetavolcanicrocksderivedfrompre-tertVmetavolcaniclWnWoWpWqWrWuWWWWWWWWWmeters}WmicaWmid-cretaceous}Wmid-paleozoicWmiddleQWXWYW]W^WdWjWnWrWuWwWxWWWWWWWmiddleandlowerpennsylvaniansandstoneandsiltstoneconta]VmigmatiteuWWmineralogicallyWminerals}WminimumNWoW}WWWW4:minorNWQWVWWWZW]W^W_WbWcWdWeWjWnWuW|W}WWWWWWmioceneJWKWLWQWWWmississippian_W`WuWvWWWWmoderatelyNWSWUWYWlW}WWmoderatelydeformedandmetamorphosedgraywackemudstonesanSVmonzoniteWWWWWWWmoreWWmorrellNWOWPWmostIWUWWWfWhWvWyWWWmountainWmountainsWWXWqWWWWWWWWWmuch}WWmudstoneJWNWQWSWgWhWjWkWlWmWnWpWtWyW|WWWWmudstoneandgraywacketurbiditesbasalticandandesiticvollVmudstoneandgraywacketurbiditessubordinateconglomeratesjVrnQWTWWW[W\W^W`WaWgWhWjWlWnorthwestJWKWLWNWOWQWRWnorthwesternTWnotWWYW\Wnow-abandonedQWRWNWqueriedQWrangeQW‚AMetamorphosed and moderately deformed diorite and subordinate quartz diorite and gabbro on Annette Island, Revillagigedo Island, and mainland to northwest (Berg and others, 1978, 1988). A small quartz diorite body near northern Annette Island yielded a Cretaceous potassium-argon apparent age; the other bodies are undated. We have assigned a Cretaceous and Jurassic age on the basis of our interpretation that rocks in unit are genetically related to Cretaceous and Jurassic volcanic (KJv) andB sedimentary (KJs) rocksCKJdDCretaceous and Jurassic EDiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.)Ną#aą#q1QWUWVWWWZW\WaWbWdWfWgWhWjWkWlWnWpWrW}WWWWWWWW119oW13W1911QWW1912QWW1926QWW1929QWTWnWoWpWWW1941NW1957QWSWtW1959\WdWfWhWuWvWxWyW{WWWW1963dWfWhW|WWW1964WW1965KWLWQWVWZW\WjWtWuWWWWW1966W1967QWTWUWVWWWZW[W\W`WfWwWxWW1970WWWWWWWWWXW_WaWbWdWeWfWgWhWnWqWsWxWyWzW}W~WWWW1976JWWWXWqW}W1977NWQWRWSWWWXWjWnWoWpWqW}WWWW1978IWKWLWNWOWPWQWRWUWVWWWZW[W\WaWbWdWfWhWjWlWnWoWpWrWuWxWyWzW|WWWWWWX`@@@A Layout #1A Layout #1B$$$$@rtopsyKWLWtowardnWWtracyWWtraditionallynWtrbqWtrcYWtreadwellQWSWtrenchNWtrendnWtriassicTWWWXWYWnWoWqWrWsWtWuWvW}WWWWWWWWtroctoliteWtrondhjemiteWWtrosvvWtrsYWtrscnWtrsvYWuWWtrvWtsKWQWtuffKWOWUWbWcWkWqWtWwW}WWWtuffaceous`WqW}Wtuffaceousargilliteandgraywackeandsubordinatechertlim`VturbiditesNWhWjWkWlWturnerWtvIWtwo-pyroxeneWWWWtwo-pyroxenegabbroandsubordinatehornblendebiotitegabbrVtwo-pyroxenegabbroondukeislandirvine1974andpercyislVofmagnetite-bearinghornblendeVuncertainQWunconformitynWundateduWWWunderlainqWuWunderlieqWundifferentiatedSWuWundividedaWuW}WunfossiliferoussW{WrW5=8mufflerQWTWUWVWWWZW[W\W`WfWwWxWmuscoviteWWmyersWWnaturepWtWnearMWQWSWXWZWlWnWoWrW}WWWWWWWWWnearbymWqWrWyWWnehentaVWnepheline-eudialyteWnikolaiXWWWnehentaVWnepheline-eudialyteWnikolaiXWXW^W_WnonmarineLWnonmarinesandstoneshaleandconglomeratekootznahooformatLVnonmetamorphosedQWnorianUWnoriteWnorthNWOWPWuWWWWWWWnorth-central|WWnortheastKWQWZW[W\WnWrWsWWnortheasternaWyWzWnorthernQWTWWW[W\W^W`WaWgWhWjWlWxWWWnorthwestJWKWLWNWOWQWRWnWpWsWyWzW}WWWWnorthwesternTWnotWWYW\WqWuWwW~WWnow-abandonedQWRWobservationsnWoccuranceWoccuredWpriorQWnWWWprobableMWQWTWjWlWnWuWvWWWprobablyIWXWdWeWqWrWvWyW}WWproducesWprodusingNWprogressivelyWproportionqWuWproportionofWproterozoicWprotolithnWpWWWWprotolithsWprovidedWprovisionallyWpsVW[WuWptmsvrWWWpuppetsUWpybus\WuWpyramidfWvWpyroclastickWpyroxeneWWWWWpyroxeniteWWWWpyroxenitehornblenditeandrelatedultramaficrocksonsoutVquartzWWWWWWWWWWWWWWquartz-whiteWquartziteWWquartzofeldspathicWqueriedQWWWrWradiolariaWradiometricWrangeQWdWfWhWuWxWyW{WWWranges}WreassignedQWWrecognitionnWnW>ultramaficWWultramaficrocksVVundividedMWPWSWVWYW`WcWlWmWpWrWtWuWwWyW}WvolcanicIWKWMWOWPWSWUWVW[W`WbWcWiWkWlWmWoWpWqWrWtWuWwWxWyW}WWWWvolcanicrocksIVKVOV[VbViVkVoVxVVVVvolcanicrocksrhyolitictobasalticUValticUVUVUVUV:nobleWWnodules\W^W_WnonmarineLWnonmarinesandstoneshaleandconglomeratekootznahooformatLVnonmetamorphosedQWnorheastWnorianUWnoriteWnorthNWOWPWuWWWWWWWWnorth-central|WWnortheastKWQWZW[W\WnWrWsWWnortheasternaWyWzWnorthernQWTWWW[W\W^W`WaWgWhWjWlWxWWWnorthwestJWKWLWNWOWQWnWpWsWyWzW}WWWWWnorthwesternTWnotWWYW\WqWuWwWWWWnow-abandonedQWWobservationsnWoccuranceWoccuredWWWWWredWWWWWWWWWW<?withinW>'_conodontswWconsiderationsWWconsideredNWfWconsistcWgWpWrWvWWWconsistingWconsistsQWUWVWWWZW\W_WaWbWdWeWfWgWhWjWkWlWnWoWrWtWuWwWyWzW|W}WWWWWWWWWWWWWWconsistsof1blocksasmuchasseveralkilometersinlength}Vconsistsof1greenschist-faciesmassivetothin-beddedmarb\Vconsistsof1lateandmiddleordoviciandioriteandquartzVconsistsof1leucocraticbiotiteaegerinearfvedsonitegarnVof1leucocraticbiotiteaegerinearfvedsonitegarnVVnitegarnVVVVVVvotherIWVWWWYWgWqWWWWothersIWKWLWNWOWPWQWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW&PandesiteIWKWUWbWgWkWrWxWWandesitetobasalticflowsflowbrecciaagglomerateandtuffVandesiticKWQWSWUW`WbWkWlWoWpWtWxWWandesiticorbasalticflowsandlocallyfragmentalrockssuboVandesitictobasalticpillowflowsbrecciaandtufffelsicttV #8‚ADeformed, disrupted, and metamorphosed mafic to intermediate and minor felsic volcanic rocks that belong to a belt of regionally disrupted rocks in the Kupreanof-Zarembo Islands area. Rocks generally metamorphosed to greenschist and greenstone. Presence of relict pyroxene phenocrysts suggests that some metavolcanic rocks were probably derived from Cretaceous and Jurassic volcanic rocks (KJv), although metavolcanic rocks of Triassic (unit Trv) and Mississippian and Late Devonian (unit MDsBQv) age may also be included (Brew and others, 1984; McClelland and Gehrels, 1987)?CKDvdDCretaceous to Devonian EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A12500R‚kABasaltic pillow flows, pillow breccia, and aquagene tuff; massive andesite pyroclastic breccia; felsic breccia and tuff; subordinate interbeds of mudstone and graywacke turbidites and metamorphic equivalents of these strata. Unit consists of (1) mafic to felsic rocks (part of the Descon Formation) on southern Prince of Wales Island (Gehrels and Saleeby, 1986, 1987a); (2) unnamed basalt and metabasalt on Long and southern Dall Islands (Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, B1984); and (3) basaltic rocks (part of the Descon Formation) and unnamed andesitic breccia on central Prince of Wales Island (Eberlein and others, 1983). Age constrained by stratigraphic relations with Lower Silurian to Lower Ordovician sedimentary rocks (unit SOs), intrusive relations with plutons of Early Silurian and Late Ordovician age (unit SOq), and Early Silurian and Late Ordovician potassium-argon ages of volcanic rocks (Eberlein and others, 1983; Gehrels and Saleeby, 1987a)\‚Crels and Saleeby, 1987a); (2) small islands south of Gravina Island (Gehrels and others, 1987); and (3) Dall Island (Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, 1984)CpOmsvDpre-Ordovician E'Metasedimentary and metavolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A8752AMetacarbonate rocks derived from pre-Ordovician carbonate rocks during regional greenschist- and local amphibolite-facies metamorphism. Found as thin to thick marble layers and lenses intercalated with pre-Ordovician metasedimentary and metavolcanic rocks (pOmsv). Pre-Ordovician protolith age and Early Ordovician to Middle Cambrian metamorphic age are indicated by intercalation with the pre-Ordovician metasedimentary and metavolcanic rocks (pOmsv). Unit consists of part of the Wales Group K‚lAMudstone and graywacke turbidites, basaltic and andesitic volcanic rocks, and metamorphic equivalents of these strata. Unit consists of (1) part of the Descon Formation on Prince of Wales Island (Eberlein and others, 1983); (2) metasedimentary and metavolcanic rocks on southeastern Prince of Wales of Island that are assigned to the Descon Formation (Eberlein and others, 1983) but may be part of the Wales Group (called the Wales metamorphic suite by Gehrels and Saleeby, 1987a) (units pOmsv Band pOmc) (Redman, 1981); (3) moderately deformed and metamorphosed andesitic to dacitic volcanic rocks and subordinate clastic strata (part of the Descon Formation) on Annette and Duke Islands (Gehrels and others, 1987); (4) unnamed metasedimentary and metavolcanic rocks near Cape Fox (Berg and others, 1978, 1988; G.E. Gehrels and J.B. Saleeby, unpub. data, 1983); and (5) conglomerate, agglomerate, and volcanic breccia (part of the Bay of Pillars Formation) of probable Early Silurian age .‚A3404BBiotite and hornblende tonalite and quartz diorite on Chichagof Island that yielded a Middle Jurassic potassium-argon (hornblende) apparent age (Loney and others, 1975)CJtD Jurassic ETonaliteium-lead (zircon) (Saint-Andre and others, 1983), and rubidium-strontium (Armstrong, 1985) apparent ages; and an undated body of nepheline-eudialyte-bearing syenite north of the Bokan Mountain Granite (Eberlein and others, 1983) suspected to be of Jurassic age. CJgrD Jurassic EGranite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A3404BBiotite and hornblende tonalite and quartz diorite on Chichagof Island that yielded a Middle Jurassic potassium-argon (hornblende) apparent age (Loney and others, 1975)CJtD Jurassic ETonaliteealite‚D?west of Juneau (Knopf, 1912; Martin, 1926; Brew and Ford, 1985) CKJvD CretaceousEVolcanic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2840AIncludes sedimentary and metasedimentary rocks that are similar in structural and metamorphic characteristics to rocks in the Cretaceous sedimentary and volcanic melange unit (Ksvm). Common lithic types include dark-gray phyllite, light-gray quartzite, and graywacke semischist. Age of formation of this melange unit is constrained by stratigraphic and structural similarities with rocks in associated Cretaceous melange units (units Ksvm and Kvm). Fossils were not recovered from rocks in thisB unit. Consists of unnamed rocks mapped by Loney and others (1975) as "phyllite" and "graywacke semischist" units on Baranof IslandqCKsmD CretaceousESedimentary rocksnbayKWZW[W\WbWdWfWgWhWiWjWlWuWvWwWxWyWzW|W}WWWWWbeKWLWNWWWXWZW\WeWfWhWlWmWnWoWqWuWwWxWzW|WWWWWWWWWWWWbeachHWbecauseyWbeds\W_WeWbeenmWnWuWyWWbelongSWuWWWbelongingKWhWiWjWqWtWWWWbelowoWbeltVWdWuWWWbeneathqWbergIWQWUWVWWWYW\WlWnWoWpWrWsWuWWWWWWWWWWWWWWW|islandsIWKWLWNWQWVWWWXW\WaWbWcWfWjWkWlWnWqW}WWWWWWWWWWWWWWisletVWisochronWitWitsQWiyoukeen_WjlWpWjmsvWjohnsonNWWWXWqW}WWWWWWWjonesWWXWZW`WqWjosephcWjualinWWRF ‚lA668984); and (3) basaltic rocks (part of the Descon Formation) and unnamed andesitic breccia on central Prince of Wales Island (Eberlein and others, 1983). Age constrained by stratigraphic relations with Lower Silurian to Lower Ordovician sedimentary rocks (unit SOs), intrusive relations with plutons of Early Silurian and Late Ordovician age (unit SOq), and Early Silurian and Late Ordovician potassium-argon ages of volcanic rocks (Eberlein and others, 1983; Gehrels and Saleeby, 1987a). CSOvDSilurian and Ordovician EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚lA66890~-southeasternHWlWWsoutherKWrWWWWsouthermostWsouthernIWQWSWWWXWZWaWbWeWiWjWkWqWWWWWWWWWsouthwestQWnWsovmWxWWsphene-bearingWssgWiWyW|WsstWstcWstagesWsteeplyWstephensQWWWstippleqWuWWWstippledpWstocksWWstraitKWQWUWWWZWstrataKWNWQWSWUWVWYWZW[W_WaWdWeWfWhWjWkWlWnWoWpWqWrWtWuWvWyW|WWWWWWstratigraphicNWQWYWfWhWkWmWpWvWWWWstructuralWWstructureseWstudyWsubaerialXWeWsubgreenschistNWQWnW}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgfWjWkWlWmWnWpWWWWWWgabbropWWWWWWWWWWWWgabbroicgWgambieruWvWgarnetWWWWgarnet-bearingWgehrelsTWUWVWWWaWbWdWeWfWjWkWlWmWnWpWWWWWWWWWWWWWWWWWWgenerallyQWeWnWWWWWWWWgeneticallyWWWWWWWWWWWWWWWWWWglacialHWglacierKWZW[W\WdWfWhWuWxWyWzW|W}WWWWglaucophane-schist}WgneissNWOWQWnWoWqWuWyW}WWWgoonXWgradationalWgradeQWVWnWoWrW}WWgradesuWWgraniteWWWgraniticgW}WgranodioriteNWWWWWWWWWWWWWgranodioriticqWgranofelsyWgranuliteWWmkruzofIWNWksPWksmWksvmWWkuiuIWWW[W\W^WaWfWgWhWiWwWxWWWWWkumWWkupreanofIWQWTWVWWW\W`WdWnWoWuWWWWkupreanof-etolinWkupreanof-zaremboWkvPWkvmWlWlaWlackQWlacustrineHWladinianYWladrones^WlakeWlanphereWWWWWWlargerWzWWWlateQWTWWWYW_W`WkWnWoWwWxW}WWWWWWWWWWWWWWWWlateral|WlaterallyWlatestYWnWwWWlathramKWLWQWVWZW\WdWfWhWjWtWuWvWxWyW{WWWWlayeredNWWWWWlayeredandlocallyzonedbodiesoftwo-pyroxeneolivinebioVlayeringWgWWWWWWWqWrWwWyWzW{W|W}WWWWhalleckformationonnorthe[VunitIWKWQWSWUWVWWWZW[W]W_WaWbWcWdWeWfWgWhWjWkWlWnWoWpWqWrWtWuWvWwWxWyWzW|W}WWWWWWWWWWWWWWWWWWWWWWunitsYWdWfWgWhWjWlWmWnWpWqWsWuWvWxWyWzW|WWWWWWWunmappedWunmetamorphosedVWunnamedHWIWKWMWQWTWVWXWYWZW[W\W^WaWbWdWfWgWjWkWlWnWoWqWrWuWxWyWzW|W}WWWWWWrWuWxWyWzW|W}WWWWWWWWWWWWWW‚vCunit Sc)CTrOcDTriassic to OrdovicianECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚hFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.DK‚kCSOvDSilurian and Ordovician EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.PphenocrystsWWphyliterWphylliteNWQWVWZWnWtWuWyW}WWWWpillarsfWgWhWiWlWpillowUWbWcWkWtWwW}WWpinnacle}WplacenWplafkerJWMWNWOWPWQWWWXWqW}WWWplagioclaseWpleistoceneIWJWpleistocenetomiocenemarinemudstonesiltstonesandstoneaJVplioceneKWplutonskWWWWWWpointfWhWyWzW|WpolymicticfWgW|WpolymicticpebbleandcobbleconglomerateandsubordinatesegVpomclWpomsvlWWpoorlytWporphyriticgWWportbWcWportlandWpositionfWmWpossiblyQWfWhWWpotassium-argonkW}WWWWWWWWWWWWWWWWWpre-devoniangWWesenceeWWprimarilyQWuWzW}WprinceIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlW|WWW(‚YA4000AUnnamed, moderately deformed and metamorphosed graphitic limestone and slate of late Ladinian (latest Middle Triassic) age on Revillagigedo Island (Silberling and others, 1982). On the basis of regional stratigraphic relations and slightly older age, Silberling and others (1982) and Berg and others (1972) suggest that these strata are not correlative with strata assigned to other Triassic units (units Trs, Trc, and Trsv)CTrscD Triassic stigation Series Map I-1867, scale 1:600,000.‚YA4000AUnnamed, moderately deformed and metamorphosed graphitic limestone and slate of late Ladinian (latest Middle Triassic) age on Revillagigedo Island (Silberling and others, 1982). On the basis of regional stratigraphic relations and slightly older age, Silberling and others (1982) and Berg and others (1972) suggest that these strata are not correlative with strata assigned to other Triassic units (units Trs, Trc, and Trsv)CTrscD Triassic sic W\equivalentsPWQWkWlWnWoWpWrWtWyW|W}WWWWWWWW11979LWNWOWPWrWWWW1980NWVWXWuW}W1981IWZW`WbWlWnWpWrWwWWWWWWWWW1982KWUWVWWWYW\WdWnWpW}WWWWW^Upeast-centralTWbWdWWWeasternnWWWeberleinIWQWTW]W^W_WaWbWcWdWeWfWgWjWkWlW|WWWWWWWWWWWWWWedgecumbeIWedgecumbevolcanicsbasaltandesiteanddaciteonkruzofislIVeliasWelliottIWpWrWWWWWWelsewhere\WuWemplacementyWWWWWWWenclosed}WWendicottoWengelsWWWentirelyxWenvironmenteWenvironmentsXWeWeoceneKWLWNWWWWepidoteWequivalentqWqW!‚AHornblende -dominant, biotite-bearing tonalite and subordinate quartz diorite found as steeply dipping, foliated, and locally lineated sills in Coast Mountains (Brew and Ford, 1981). Found near Ketchikan (Berg and others, 1978, 1988; Elliott and Koch, 1981), near Petersburg (Brew and others, 1984), near Juneau (Brew and Grybeck, 1984; Brew and Ford, 1977, 1985), and north of Haines (MacKevett and others, 1974; Redman and others, 1984; E.C. Robertson, written commun., 1984; Barker and otherBs, 1986). Field and uranium-lead (zircon) data indicate emplacement in Paleocene and Late Cretaceous time, during waning stages of deformation and metamorphism in Coast Mountains (Gehrels and others, 1984; Brew and Ford, 1981)CTKtDPaleocene and Cretaceous E Tonalite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.9 A BCDEFGHIDEFGHI%trosvuc&trocvw('lpdsvwq(doczw')dsc{zC*dssc|zd+ksvm}:a,kdsdksm~:b-kdvdkvm:d.ptmsv#a/ptmc#q0pomsvb1pomcc2tgb#e3tgr#a4tgd#5tgtgt$6tkgtkt's7kgt58kdb59kum5:kg5;kd6Qkjgb:1?jgrE!@jtEAjtrdJBtrgbT1CtrgG1DplpsyiEsstxAFogbsoumxaGsoqaHcdg OO"‚AA heterogeneous suite of plutons consisting primarily of biotite, hornblende, magnetite +/- pyroxene +/- garnet granodiorite and subordinate quartz monzonite, tonalite, trondhjemite, and quartz diorite. On Chichagof Island there plutons are associated with Early Cretaceous gabbro (unit Kgb) and diorite (unit Kd). Many intrusive bodies show crude zoning from leucocratic rocks in interior to pregressively more mafic rocks toward margins. Potassium-argon apparent ages record emplacement primaBrily during Early Cretaceous time, although similar intrusive bodies northwest of Glacier Bay in Canada also yield Jurassic potassium-argon apparent ages (Chris Dodds, oral commun., 1984). Some bodies could also be of Silurian or Ordovician age. Found on Dall Island (Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, 1984), Prince of Wales Island and adjacent smaller islands (Eberlein and others, 1983; Brew and others, 1984), Kuiu Island (Brew and others, 1984), Admiralty Island (Lathr,qmainlandIWQW\WnWoWpWsWWWWWWWWWmainlyyWmakeQWHWuWWWmapQW\WnWpWuWvWyWzWWWWmappednW~WmarbleVWWW\WdWfWnWoWqWsWtWuWvWyWzW}WWWWWWWmarginnWmarginsWmarincovichLWmarineHWJWLWNWQWeW}WWmarinegraywackeandmudstonesubordinateconglomerateandaQVmartinQWRWmassiveWW\W^WdWfWkWwWmassivelimestoneandminordolomitecontaininglight-grayc^Vmassivethintothick-beddedlocallyreefoidallight-graylifVmassivetothick-beddedlimestoneandminordolomiteinmostWVmategraywackenWmaterial}Wmatrix}WWmaximumqWmayKW\WlWnWoWpWqWuWxWzW|WWWWWWWmcclellandVWdWWWmdsvuWWWmedium-bedded\W^Wmelange}W~WWE‚AMetasedimentary and metavolcanic rocks derived from pre-Ordovician basaltic to andesitic pillow flows, pillow breccia, and tuff breccia, volcanoclastic graywacke and mudstone, and minor limestone and felsic volcanic breccia and tuff during regional greenschist- and local amphibolite-facies metamorphism. Common rock types include greenschist, greenstone, quartz-white mica schist, and marble. Radiometric age constraints suggest that metamorphism occured during Early Ordovician to Middle CambBrian time (Turner and others, 1977; Gehrels and Saleeby, 1987a, b; M.A. Lanphere, oral commun., 1984). Pre-Ordovician protolith ages are indicated by intrusive relations with Cambrian diorite and granodiorite (Cdg) on eastern Prince of Wales Island and on southermost Gravina Island (Gehrels and others, 1987). Unit consists of part of the Wales Group (called the Wales metamorphic suite by Gehrels and Saleeby, 1987a) on (1) south-central Prince of Wales Island (Eberlein and others, 1983; Gehm!9‚ABiotite-dominant, hornblende- and sphene-bearing granodiorite and subordinate quartz monzonite, quartz diorite, and leucogranite found in Coast Mountains (Berg and others, 1978, 1988; Elliott and Koch, 1981; Brew and others, 1984; Webster, 1984; Brew and Grybeck, 1984; Brew and Ford, 1977, 1985; Souther and others, 1979; Redman and others, 1984; Barker and others, 1986). Concordant potassium-argon apparent ages on hornblende and biotite (Forbes and Engels, 1970; Smith and others, 1979) andBg uranium-lead (zircon) apparent ages (Gehrels and others, 1984) indicate emplacement during Eocene timeUCTgDEocene E Granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A1350`WdoddsMWNWyWzWWWdolomiteWW\W^WdominantWdosvzWdouglasSWWWdsyW|WdscyWzWdsscyWdsvyW{WdukelWWWWduniteWduringUW^W_WyW}WWWWWWWWWWdutrowWdvxWyWeMWXWfWjWkWlWmWnWpWuWWWWWWWearlWearliestwWearlyNWQWZW\W^W_W`WfWhWjWkWlWnWwW}WWWWWWWWWWWWWWWWWWeastIW\WnWoWpWrWWWWWWWWWWWedgecumbeIWedgecumbevolcanicsbasaltandesiteanddaciteonkruzofislIVelliottIWpWrWWWWWelsewhere\WuWemplacementyWWWWenclosed}WWendicottoWengelsWWWentirelyxWenvironmenteWenvironmentsXWeWeoceneKWLWNWWWW$includeNWOWVWnWoW}WWWWWWWincludedWWnWsWWincludesWWyWWWincludesmaficvolcanicandmetavolcanicrocksthatresembleVincludessedimentaryandmetasedimentaryrocksthataresimiVincreaseQWincreasesnWindicateUW^WfWhWWWWWindicatedpWWWWWWindicatesOWinferredsWuWinformationQWinlet}WinterbeddedKWPWUW[WcWeWmWnWoWinterbeddedgraywackemudstonemafictofelsicvolcanicrockmVinterbeddedsedimentaryandvolcanicrocksandtheirmetamorPVinterbedsUWbWdWkWintercalatedoWWintercalationWWinteriorWintermediateVWiWyWWinterpreteWfWinterpretationqWuWWWWinterpretedNWWWXWhWmWnWuWyW|WyWyWyWyWyWyWyWyWyWyW"^KdepositionQWUW^WfWhWnWWWdepositionalnWoWdepositsHWNWgWhWderivedgWiWyWzWWWWWWdesconjWkWlWmWdescribedPWoWpW}WWWWdetermineduWWWdevonian`WaWbWcWdWeWfWhWuWvWwWxWyWzW{W|WWWdiagnosticWWdifferentWdigglesWWWWWdioriteWWWWWWWWWWWWWWWWWWWdipXWdippingWdirectlywWdiscontinuous{WWdiscussedWdiscussionWdisruptedNWVWdWuWWWdiverserWWdiverseassemblageofgenerallyfoliatedandlayeredgranodiVdiverseassemblageofsedimentaryandvolcanicrocksandtherVdodduWvWvWvWvWvWvWvWvWeoceneKWLWNWequivalentqWequivalentsPWQWRWkWlWnWoWpWrWW\Wetolin-kupreanofRWgreenschistNWQWVWiWmWnWtWuW}WWWWWWWgreenschist-facies\WWgreenstoneVWXWiWrWtW}WWWWWWWWWWWzHconglomeraticeWgWconglomeraticrockseVgVdepositsHWdioriteWWWdioriteandgabbroVdioriteandgranodioriteVgabbroWgranitegranodioriteWWWgranodioriteandtonaliteVVmappedWmetacarbonateWWmetacarbonaterocksVVmetasedimentaryWWmetasedimentaryandmetavolcanicrocksVVmetavolcanicWWnotWquartzWquartzdioriteVrhyoliticUWrocksIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWmenatryrocks]V]Vyrocks]V]Vmenatryrocks]V]V]V]Vatryrocks]V]V]V]V]Vks]V]V]V]V]VfaciesNWOWQWVWmWnWyW|W}WWWfairweather}WfanNWfanshowQWfaultxW}Wfault-bounded}Wfaults}WfaunanWfavoredfWfeldspathicuWfelsicVWkWmWnWqWtWuWWWWfieldWfilledWflowUWXWWflowsUWVWXWbWcWiWjWkWoWtWWWfluvialHWfoliatedpWWWWWfoliatedandmetamorphosedhornblendedioriteandbiotitehoVfoliationWfollowingnWforPWoWpWzWWWWWforbesWWWfordKWQWSW\WdWfWhWnWoWpWuWvWxWyW{W|WWWWWWWWWformationJWKWLWQWSWUWVWZW[W\W]W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWtWuWvWwWxWyWzW|W}WWWWWformed}WforresterjWfossiliferous\WqWqWqWqWqWqWqWi‚aASiltstone, shale, sandstone, graywacke, and subordinate limestone breccia, arkose, conglomerate, and volcanic rocks. Unit consists of (1) the Lower Devonian Karheen Formation in the Annette-Gravina Islands area (Gehrels and others, 1987) and on southern Prince of Wales Island (Herreid and others, 1978; Gehrels and Saleeby, 1986, 1987a; Savage and Gehrels, 1984); (2) unnamed Lower Devonian strata on west-central Prince of Wales Island and on smaller islands to west (Eberlein and others, 198B3); (3) unnamed Devonian (?) graywacke, argillite, and arkose on northern Kuiu Island (Brew and others, 1984); and (4) undivided part of the Devonian Cedar Cove Formation on northeastern Chichagof Island (Loney and others, 1975)CDsDDevonianESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.2‚uCtrata correlative with the Upper Triassic Hyd Formation (unit Trsv), the Permian Pybus Formation (unit Pc) and Cannery Formation (unit Ps on Admiralty Island), the Mississippian and Devonian Cannery Formation (unit MDsv on Kupreanof Island), the Ordovician Hood Bay Formation (unit SOs), and various strata elsewhere assigned to Devonian, Silurian, or Ordovician units. Rocks in part of unit may also belong to belt of regionally disrupted rocks (unit KDsd and KDvd). Areas on Admiralty Island Dthat may be underlain by a significant proportion of younger intrusive rock are shown with a stipple pattern. In the Chilkat Range west of Haines unit consists of unnamed metasedimentary and metavolcanic rocks (MacKevett and others, 1974; E.C. Robertson, written commun., 1984; Redman, 1984b) that are of known Mississippian age (Redman and others, 1985) and probable Triassic to middle Paleozoic age (MacKevett and others, 1974; Berg and Grybeck, 1980; Redman, 1984b). These rocks are herein i(#‚[AKLower Permian basalt (part of the Halleck Formation) on northern Kuiu Island (Muffler, 1967) and unnamed Permian basaltic (?) rocks northeast of Glacier Bay (Brew and others, 1978). Age constrained by interbedded Lower Permian clastic strata (unit Ps) on Kuiu Island and interbedded Permian carbonate rocks (Pc) in Glacier Bay areaKCPvDPermianEVolcanic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.'‚pFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚qA5271AUnnamed fossiliferous argillite of Cretaceous age; variably metamorphosed chert, tuffaceous sandstone, felsic tuff, argillite, and light-gray, thin-bedded limestone of Mesozoic or Paleozoic age; highly sheared metasedimentary, metavolcanic, and granodioritic rocks of Mesozoic and Paleozoic (?) age; and amphibolite, gneiss, schist, and marble of Mesozoic or Paleozoic age (Johnson and Karl, 1985; Loney and others, 1975). We assign a maximum age of Permian on the basis of our interpretation t‚dECarbonate rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.d ‚bA7030ltstone, shale, sandstone, graywacke, and subordinate limestone breccia, arkose, conglomerate, and volcanic rocks. Unit consists of (1) the Lower Devonian Karheen Formation in the Annette-Gravina Islands area (Gehrels and others, 1987) and on southern Prince of Wales Island (Herreid and others, 1978; Gehrels and Saleeby, 1986, 1987a; Savage and Gehrels, 1984); (2) unnamed Lower Devonian strata on west-central Prince of Wales Island and on smaller islands to west (Eberlein and others, 198B3); (3) unnamed Devonian (?) graywacke, argillite, and arkose on northern Kuiu Island (Brew and others, 1984); and (4) undivided part of the Devonian Cedar Cove Formation on northeastern Chichagof Island (Loney and others, 1975). CDsDDevonianESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.IDs‚bA7030apparentfW}WWWWWWWWWWWWWWWWWWWapparentlypWWWaquageneUWbWcWkWwWareHWIWKWNWOWPWQWSWUWWWYW`WcWfWhWlWnWqWtWuWvWwWyWzW}WWWWWWWWWWWWWWWWareaVW[W\WaWfWpWyWzWWWWWWWWWWWareasHWNWQWUWVWWWfWhWpWqWuWyWWWWWareasnottobefilledthatliewithincoveragetypicallynoVarfvedsoniteWWargillaceousWargilliteNWQWZW`WaWfWjWqW|W}WWarkoseaWarmoWWWarmstrongWWWWWWWWWWWWWWWWWWbasaltIWKWOWUWXW[WbWjWkWrWxWbasaltandbasaltictuffnorthofcrosssoundthataredeforOV‚nB metamorphic grade along northwest trend of these map units. Common rock types in higher grade strata include phyllite, schist, and gneiss. Late Triassic fossils were recovered from carbonaceous slate and limestone assigned to this map unit near Juneau (Ford and Brew, 1977; H.C. Berg, unpub. data, 1981), and similar strata (locally mapped as Triassic clastic sedimentary and carbonate rocks (Trsc)) on Revillagigedo Island yielded latest Middle Triassic fauna (Silberling and others, 1982). OCn Revillagigedo Island, phyllite and mategraywacke are locally in depositional contact with crinoidal marble of known Permian age (unit Pc) and are interbedded with crinoidal marble of probable Permian age (Berg and others, 1978, 1988; H.C. Berg, unpub. data, 1975). Some strata included in this unit are interpreted to be Cretaceous or Jurassic in age on the basis of the following observations: (1) Berg and others (1978, 1988) report that metasedimentary rocks in this unit on Revillagigedo &nageskWnW}WWWWWWWWWWWWWWWagglomerateiWlWWalaskaHWWWXWqWWalaska-britishIWzWWWalbianQWalkaliWallcWfWalongKW\WdWmWnWoWuWxWzWWWWalsoWWXWeWnWuWyWWWWalthoughfWhWoWWWamphiboleWamphiboliteNWOWQWnWoWpWqWyW}WWWamphibolite-faciesWWanQWnW}WWWWWWandHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWW.]‚ABiotite +/- hornblende +/- muscovite +/- garnet granodiorite, granite, quartz monzonite, tonalite, and quartz diorite. Unit consists of muscovite- and locally garnet-bearing granodiorite, granite, and tonalite on Baranof and Chichagof Islands and in Glacier Bay. Where dated, these intrusive bodies yield Eocene potassium-argon apparent ages (Loney and others, 1975; Decker and Plafker, 1982; Johnson and Karl, 1985; Brew and others, 1978). In the Chilkat Range and on southeastern Baranof IslaBnd, intrusive bodies consist of biotite- and hornblende-bearing quartz diorite and granodiorite that yield Oligocene potassium-argon apparent ages (Loney and others, 1975; MacKevett and others, 1974; Brew and Ford, 1985)CTgd DOligocene and Eocene E Granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A1305I-bernersQWWbetweenTW\WnW}WbiotiteWWWWWWWWWWWWWWWWWbiotiteandhornblendetonaliteandquartzdioriteonchichaVbiotitehornblendemuscovitegarnetgranodioritegranitequaVbiotitehornblendepyroxenegranitealkaligranitequartzmoVbiotite-bearingWbiotite-dominantWWbiotite-dominanthornblendeandsphene-bearinggranodioriteVbiotite-dominanthornblende-bearinggranodioriteandtonalitVV2 ‚Bll Greenstone on western Chichagof Island, which yielded radiolaria of Early Cretaceous age (Johnson and Karl, 1985), and unnamed metavolcanic rocks on Baranof Island that are referred to as "greenschist and greenstone" unit by Loney and others (1975)CKvmD Cretaceous EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2971ADeformed, disrupted, and metamorphosed graywacke, siltstone, mudstone, and subordinate chert, limestone, and volcanic and intrusive rocks that belong to a belt of regionally disrupted rocks in the Kupreanof-Etolin Islands area. Common metamorphic rock types include subgreenschist- to greenschist-facies graywacke semischist, phyllite, argillite, slate, and subordinate greenstone, greenschist, and marble. Unit consists of blocks as much as several kilometers in length of Triassic sedimentar2‚}Dch is a melange of blocks enclosed in a sedimentary and volcanic matrix, and the Freeburn assemblage, which consists of fault-bounded blocks of sedimentary and volcanic rocks (Decker, 1980; Karl and others, 1982; Johnson and Karl, 1985). The Freeburn assemblage comprises rocks described by Loney and others (1975) as the Pinnacle Peak Phyllite and an unnamed schist unit in the Kelp Bay Group. On Baranof Island, unit consists of rocks described by Loney and others (1975) as the Khaz FormatioEn, part of the undivided Kelp Bay Group, and an unnamed "schist gneiss, amphibolite, and greenschist" unit (Karl and others, 1982). Northwest of Cross Sound, unit consists of melange between Brady Glacier and Border Ranges faults (Tarr Inlet suture zone) that is continuous and probably correlative with part of melange on Chichagof and Baranof Islands (Decker and Plafker, 1982) and part of melange facies of the Yakutat Group west of the Fairweather fault (Plafker and others, 1977; George Pl4‚yAGraywacke, mudstone, shale, limestone, and subordinate mafic to intermediate volcanic rocks that have been metamorphosed in most areas to hornfels, slate, phyllite, schist, amphibolite, marble, gneiss, and granofels. Unit consists of unnamed rocks on northeastern Chichagof Island, in Glacier Bay area, and in the Chilkat Range. Loney and others (1975) suggest that metamorphic rocks on Chichagof Island were derived mainly from the Point Augusta Formation (unit Ss) and from Devonian volcanic Brocks of the Freshwater Bay Formation (unit Dv). In Glacier Bay area and the Chilkat Range rocks are probably the metamorphic equivalents of Devonian and Silurian strata found nearby (units Ds, Dv, Dcg, Ss, Sc, DSsc, DSc, and DSv) (Lathram and others, 1959; Brew and others, 1978; Brew and Ford, 1985). We suggest that this unit also includes rocks of Ordovician age because Ordovician strata are found in contiguous map units northwest of Glacier Bay in British Columbia (Campbell and Dodds, 19thin-beddedWW\WdWjWqWthin-beddedtomassivegraylimestoneandminorshaleinterbdVthisIWWWnWoWqWtWuWvWyWWWWWWWWWWthosePWthroughxWtidalfWhW|WtimeQWUW^W_WfWhWyW}WWWWWWWWtkopeWtktpWWtoIWJWKWLWNWOWPWQWSWVWWWXWYWZW\W^W_WaWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW|W}WWWWWWWWWWWWWWWWWWWWWWtonalitepWWWWWWWWWtonaliticWWWWWW]W_WaWbWcWdWeWfWgWhWjWkWunitsYWdWfWgWhWjWunmetamorphosedVWunnamedHWIWKWMWQWRWTWVWXWYWZW[W\W^WaWbWdWfWgWjWcapeQWlWcarbonaceousMWNWnWcarbonaceousshalemudstoneandgraywackesubordinatelimestnVcarbonateWW[W\WiWnWoWpWsWtWuWvWzW|WWWWcarbonaterocksregionallymetamorphosedtograymarblemackvVcarbonaterocksthatweremetamorphosedtothintothick-bedzVcarbonate-richWcarboniferousrWW\W^W_W`WgWjWnWpWqWchert-pebble]Wcherty\WchichagofNWWWXW_WaWbWdWeWfWgWhWqWchilkatdWfWhWchitistoneWWclarkjWclasticKW[WhWlWnWoWrWclastsgWclinopyroxeneRWcoarseeWcoastKWmWoWcoatsNWcobblegWcoevalmWcolluvialHWcolumbiaIWpWcolumbia-alaskarWcommonNWOWRWVWnWoWcommunJWMWNWOWQWXWconformableUWconglomerateJWLWMWNWQWTWVWZW\W]WaWcWeWfWgWhWjWlWnWrW\V‚}A2950AConsists of (1) blocks as much as several kilometers in length of marine sedimentary and volcanic rocks, and their metamorphic equivalents, that are bounded by fault or shear zones; and (2) blocks as much as several tens of meters in length of marine sedimentary and volcanic rocks, and their metamorphic equivalents, enclosed in a matrix of moderately metamorphosed and penetratively sheared graywacke, argillite, tuff, and pillow breccia. Common lithic types in blocks include tuffaceous argied in a matrix of moderately metamorphosed and penetratively sheared graywacke, argillite, tuff, and pillow breccia. Common lithic types in blocks include tuffaceous argiargicrubidium-strontiumWWrubinWruckmickWWruthWsaginawwWsaginawbayformationonkuiuislandfromyoungesttooldestwVsaintWsaint-andreWsaleebyaWbWeWfWjWkWlWmWpWWWWWWWWWWWsamezWsandstoneJWLWMWNWQWSWTWVW]WaWeWgWjWqWrW|WsandstoneandmudstoneturbiditesandsubordinateconglomeraNVsavageaWbWdWscgWiWvWyWzW|Wscg|WschistNWOWQWnWoWqWrWuWyW}WWWsectionseWAorIWQWUWXWfWjWnWoWpWqWuWvWxWzW|W}WWWWWWWWWWWWoralWWWordovicianjWkWmWuWvWyWzWWWWWWWWWWvWyWzWWWWWWWWWWWWWWW|c1:600000HWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWalaskaHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWeWeWy-o‚A98BEAreas not to be filled that lie within coverage, typically not mappedCnmDunknownEAreas not mappedl Prince of Wales Island and on southern Gravina Island that yielded Late and Middle Cambrian preliminary uranium-lead (zircon) apparent ages (Gehrels and Saleeby, 1987b; Gehrels and others, 1987), and foliated and layered leucogranodiorite on southern Dall Island that has yielded an Early Cambrian uranium-lead (zircon) apparent age (G.E. Gehrels, unpub. data, 1984, Gehrels, 1984, 1987; GehrBels and Saleeby, 1987b). CCdgD Cambrian EDiorite and granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A98BEAreas not to be filled that lie within coverage, typically not mappedCnmDunknownEAreas not mappedilled that lie within coverage, typically not mappedx‚AFoliated and metamorphosed hornblende diorite and biotite +/- hornblende granodiorite on east-central Prince of Wales Island and on southern Gravina Island that yielded Late and Middle Cambrian preliminary uranium-lead (zircon) apparent ages (Gehrels and Saleeby, 1987b; Gehrels and others, 1987), and foliated and layered leucogranodiorite on southern Dall Island that has yielded an Early Cambrian uranium-lead (zircon) apparent age (G.E. Gehrels, unpub. data, 1984, Gehrels, 1984, 1987; GehrBels and Saleeby, 1987b)CCdgD Cambrian EDiorite and granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.brtrpcstrpsvttrsTtrscYtrsvVtrvUtsLtsvMtvKandMWPWSWVWYW`WcWlWmWpWqWrWtWuWwWyW}WWWWWWWWareasWareasnotmappedVbasalticUWXWbasalticrocksXVcarbonateWWYW\W^W_WdWfWmWqWsWvWzW{WcarbonaterocksWV\V^V_VdVfVsVvVzV{VclasticYWmWqWclasticsedimentaryandcarbonaterocksundividedYVclasticsedimentaryvolcanicandcarbonaterocksqVclasticsedimentaryvolcanicandcarbonaterocksundividedmVonaterocksundividedmVmVmVmVdmVmV"correlativeIWKWPWWWXWYW\WdWeWfWpWqWuWvWxWzW}WWWWcorrelativesSWcouldWcoveaWdWeWtW|WcoverageWcrawfordWcreekfWgWvWWcretaceousNWOWPWQWnWoWpWqWsWyW}WWWWWWWWWWWWWWWWWWWWWWWWWWcrosscuttingoWWWcrudeWdaciteIWdaciticlWdallfWjWkWmWWWdark-grayWW_WzW~WdatafWjWkWlWmWnWpWsWWWWWWdatedWdavisXWdczWWdcgyW|WdeckerNW}WWWdeep-waterNWdeformationQWnWWdeformedNWOWQWRWSWUWYWlWnWoWpWuWWWdeformeddisruptedandmetamorphosedgraywackesiltstonemudVdeformeddisruptedandmetamorphosedmafictointermediateaVdegreenWdepositedXW_WeWw GalaskafWgWhWiWjWkWlWmWnWoWpWqW‚\AConsists of (1) greenschist-facies, massive to thin-bedded marble of Early Permian age on Revillagigedo Island (Silberling and others, 1982; Berg and others, 1978, 1988) and of Permian (?) age on mainland east of Admiralty Island (Brew and Grybeck, 1984); (2) medium-bedded dolomite, limestone, and subordinate gray chert beds and nodules (Pybus Formation) on northern Kuiu and Kupreanof Islands (Lower Permian) (Muffler, 1967; Brew and others, 1984), Admiralty Island (Permian) (Lathram and otBhers, 1965), and a small island between northern Prince of Wales and Etolin Island (Lower Permian) (Brew and others, 1984); and (3) unnamed fossiliferous gray limestone, cherty limestone, and limestone conglomerate of Permian age northeast of Glacier Bay (Brew and others, 1978) and along west shore of Lynn Canal (Lathram and others, 1959; Brew and Ford, 1985). Marble on Revillagigedo Island and on mainland east of Admiralty Island may not be correlative with Permian carbonate rocks elsewheLnsubordinateMWNWQWUW\W_W`WaWbWfWgWhWjWkWlWnWoWpWuWyWWWWWWWWWWWWWWWWWsuchWWsuggestWWXWYWeWnWvWyWzWWWWWWWsuggestedxWsuggestingWsuggestsWsuitelWWWWWWsukkwanjWWWsuspectedWsutterWsuture}WsvxWsyeniteWWWWWsyeniteonsukkwanislandthatcontainsbiotiteamphiboleaeVsyeniticWWsymondsQWtarr}WtaylorWtens}Wns}W}W}WWWWWWWthermallyNWtheseNWQWRWYWiWkWlWnWoWpWrWtWuWtheseobservationsfWtheyxWthickeWthick-beddedWW_WfWuWzWthin_WfWuWzW{Wthindiscontinuousunfossiliferouslimestonelayersassociat{Vthintothick-beddeddark-graylimestonesubordinatebedsan_V"‚APrimarily hornblende +/- biotite +/- clinopyroxene diorite and subordinate quartz diorite and gabbro. Generally found in association with Early Cretaceous granodiorite (unit Kg) and gabbro (unit Kgb). Found on Prince of Wales Island (Eberlein and others, 1983; Gehrels and Saleeby, 1986, 1987a) and on Chichagof Island (Loney and others, 1975; Johnson and Karl, 1985). As described above for the Cretaceous granodiorite unit (Kg), some rocks in this unit may be of Late Jurassic or of Silurian Bor Ordovician ageCKdD Cretaceous EDiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2550 scale|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW#‚C (?), Triassic, Permian (?), Carboniferous (?), and Proterozoic (?) are indicated by (1) relations along Alaska-British Columbia border east of Juneau which suggest that rocks in this unit grade into strata of Triassic and older age and that these Triassic rocks locally contain clasts of older metamorphic rocks (Souther, 1971); (2) a preliminary rubidium-strontium isochron of Proterozoic apparent age (R.L. Armstrong, oral commun., 1984) determined on high-grade metamorphic rocks along AlaDska-British Columbia border north of Juneau (Souther and others, 1979; Werner, 1978); (3) occurance of Triassic strata near Alaska-British Columbia border north of Juneau (not shown on map) which are adjacent to, and perhaps overlie, high-grade metamorphic rocks (Brew and others, 1985); (4) relations southeast of map area in Portland Canal-Terrace area which suggest that similar metamorphic rocks were derived from Cretaceous and Jurassic strata (Douglas, 1986), the Jurassic Bowser Lake GrozzonedWWWzones}WzoningWcdgdcddcgedoczdosvydsadsc{dssc|dsvcxdvbjgrjmsvrjtjtrdkdkdbkdsdkdvdkgkgbkgtkjdkjgbkjsQkjsvSkjvkpsnkpsvpkpsvcqkpvoksNksmksvPksvm}kumkvOkvmmc_mdsv`nmogbpac^padsvwpas]pc\pomcpomsvppasypsZptmcptmsvpv[qsHqtsJqtvIscfscggsoqsosjsosvlsosvcmsoumsovksshsstsvitgtgbtgdtgrtgttkgtkttrbXtrcWtrgtrgbtrocvtrosvusvuvuuP4‚wA6095ASaginaw Bay Formation on Kuiu Island. From youngest to oldest, unit consists of silty limestone, calcareous chert and limestone, black chert, and massive aquagene tuff and pillow breccia (Muffler, 1967). Silty limestone and calcareous chert and limestone are known to be Middle and Lower Pennsylvanian; age of black chert is not known directly; and volcanic rocks yielded earliest Late to latest Early Devonian conodonts (Dutro and others, 1981; Brew and others, 1984)CPaDsvDPennsylvanian to Devonian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚xA7020nian to Devonian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚xA70207020xA7020A7020b<sedimentaryHWJWLWMWNWPWQWSWTWVWYWZW]W`WaWcWhWjWlWmWnWpWqWrWtWuWwWyW|W}WWWsedimentaryandvolcanicrocksundividedMVPVSVVV`VcVlVpVrVtVuVwVyV}VsedimentaryrocksJVLVNVQVTVZV]VaVhVjVnV|VVVsurficialHWsurficialsedimentarydepositsHVsyeniteWsyeniteandtrondhjemiteVtoUWtonaliteWWtrondhjemiteWtrondhjemiteWWjemiteWWWWWWWcWWultramaficrocksVVundividedMWPWSWVWYW`WcWlWmWpWrWtWuWwWyW}WvolcanicIWKWMWOWPWRWSWUWVW[W`WbWcWiWkWlWmWoWpWqWrWtWuWwWxWyW}WWWvolcanicrocksIVKVOVRV[VbViVkVoVxVVVvolcanicrocksrhyolitictobasalticUV‚QAMarine graywacke and mudstone, subordinate conglomerate and andesitic to basaltic volcanic rocks, minor limestone, and regionally metamorphosed and deformed equivalents of these strata. Metamorphic grade generally increase from subgreenschist facies or nonmetamorphosed on southwest to greenschist and in some areas amphibolite facies to northeast. Rock types in higher grade parts of unit are primarily phyllite, schist, and gneiss. Strata are queried on geologic map where metamorphism and deBformation, or lack of stratigraphic information, make correlation with sedimentary rocks of known Cretaceous and Jurassic age uncertain. Regional metamorphism and deformation occurred after Early Cretaceous time and prior to deposition of the Kootznahoo Formation (unit Ts) of Miocene to Paleocene age (Buddington and Chapin, 1929). Fossils range in age from Cenomanian or Albian to Late and possibly Middle Jurassic (Breg and others, 1972; Brew and others, 1984). Unit consists of (1) the Grav l?ageIWKWLWMWNWOWPWQWTWWWXWYWZW[W\W`WfWhWjWkWlWnWoWpWqWrWsWtWuWvWwWxWyWzW}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWXWqWalaska-britishIWzWWWalbianQWalkaliWallcWfWalongKW\WdWmWnWoWuWxWzWWWalsoWWXWeWnWuWyWWalthoughfWhWoWWamphiboliteNWOWQWnWoWpWqWyW}WWWamphibolite-faciesWWanQWnW}WandHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWV`unpubfWjWkWlWmWnWpWsWWWWWWWupgradedNWWnWpWsWWWWWWWupgradedNWNWWnWpWsWWWWWWWWWkWlWmWnWpWsWWWWWWWWNWupperTWXWbWcWdWfWhWrWtWuWxW|WWuppertriassicconglomeratelimestoneandcalcareoussiltstoTVuranium-leadWWWWWWWvaldezNWOWvariablyqWvariousgWuWvaryVWvolcanicIWKWMWOWPWQWRW`WaWeWfWiWkWlWmWnWoWpWrWuWwWxWyWzW{W|W}W~WWWWWWWWWWWvolcanicsIWKWRWSWUWcWvolcanoclasticWvolcanogenicNWcWwadleighdWwalesIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlW|WWWWWWWWWWwaningWwasVWzW$r‚B consists of plutons on Revillagigedo Island and adjacent mainland (Berg and others, 1978, 1988; Eberlein and others, 1983; Zen and Hammarstrom, 1984a, b), in Etolin-Kupreanof Islands area (Brew and others, 1984; Burrell, 1984; Buddington and Chapin, 1929), on mainland east of Admiralty Island (Buddington and Chapin, 1929; Brew and Grybeck, 1984; Souther and others, 1979; Brew and Ford, 1985), and in the Haines region (MacKevett and others, 1974; Redman and others, 1984; Earl Redman, writtCen commun., 1985). Plutons that are mineralogically or compositionally different from main suite of intrusive bodies are queried on geologic maplCKgtD Cretaceous EGranodiorite and tonalite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2494+ ‚A12600tersburg (Brew and others, 1984; Souther and others, 1979), near Tracy Arm (Brew and Grybeck, 1984), near Juneau (Ford and Brew, 1973; Brew and Ford, 1977, 1985; Souther and others, 1979), southeast of Haines (Souther and others, 1979; Werner, 1978), and near Skagway (Redman and others, 1984) CpTmsvD pre-TertiaryE%Metasedimetary and metavolcanic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A12600LslokoKWslope-basinNWsmallTW\WbWWWWWWsmallplutonstobatholithsofgranodioritetonaliteandsubVsmalleraWWsmithWWWWWWsomeNWQWfWhWnWoWpWzWWWWWWWWWWWsonnevilWsoqkWsoskWmWuWsosvmWWsoundJWKWLWNWOWPW}WWWsouthNWQWbW}WWsouth-centralWsoutheastoWpWWWWWWgWiWyW|WstcWstephensQWRWWstippleqWuWWstippledpWstocksWWstraitKWQWUWWWZWstrataKWNWQWRWSWUWVWYWZW[W_WaWdWeWfWhWjWkWlWnWoWpWqWrWtWuWvWyW|WWWWstratigraphicNWQWRWYWfWhWkWmWpWvW~WWstructural~WWstructureseWstudyWsubaerialXWeWsubgreenschistNWQWnW}WW‚SAModerately deformed and metamorphosed graywacke, mudstone, sandstone, and andesitic to basaltic rocks. Strata belong to the Shelter Formation in southern Lynn Canal (Barker, 1957) and are undifferentiated correlatives of the Treadwell Slate (unit KJs), the Seymour Canal Formation (unit KJs), and the Douglas Island Volcanics (unit KJv) near Juneau (Ford and Brew, 1973, 1977; Brew and Ford, 1985)CKJsvDCretaceous and JurassicE*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚TA44704470i‚bABasaltic and subordinate andesitic pillow flows, breccia, aquagene tuff, and minor sedimentary interbeds. Unit consists of (1) unnamed basaltic-andesitic pillow flows and breccia (Lower Devonian) on small islands south of Annette Island (Gehrels and others, 1987) and on southern Prince of Wales Island (Herreid and others, 1978; Gehrels and Saleeby, 1986, 1987a); (2) basaltic rocks in the Port Refugio Formation (Upper Devonian) on west-central Prince of Wales Island (Eberlein and others, 1B983); (3) Lower Devonian rhyolite in Kasaan Bay on east-central Prince of Wales Island (Eberlein and others, 1983; Savage, 1981); and (4) Upper Devonian andesite, basalt, and minor rhyolite (Freshwater Bay Formation) on Chichagof Island (Loney and others, 1975)CDvD Devonian EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚cA6928group@have@hood@however@include@_interpreted}$intertonguing@islands@Jjuneau@koch@kruzof@Nlayers@limit@3lynn@mafictointermediatevolcanicbrecciaagglomerateandflows@,mainland@[many@mesozoic@metasedimentary@4minor@5muffler@:noble@=occurred@onnorth-centralprinceofwalesislandunitconsistsofunn@or@vother@Aour@part@parts@percy@phenocrysts@Spre-ordovician@prior@;recognized@regionally@reported@rubidium-strontium@usedimentary@shaly@+silty@sloko@southeastern@Lsubordinate@~tertiary@heastern@Lsubordinate@~tertiary@outheastern@Lsubordinate@~tertiary@@southeastern@Lsubordinate@~tens@bbroandsubordinatehornblendebiotitegabbr@‚zACarbonate rocks that were metamorphosed to thin- to thick-bedded, dark-gray to white marble. Consists of unnamed rocks on northeastern Chichagof Island and in Glacier Bay area. Loney and others (1975) suggest that marble on Chichagof Island was derived primarily from limestone in the Point Augusta Formation (unit Sc). Marble in Glacier Bay area was derived in large part from limestone of Devonian (unit Dc), Silurian (unit Sc), or Devonian and Silurian (DSc) age (Brew and others, 1978). SomB e marble in unit may be correlative with Ordovician limestone in map units along Alaska-British Columbia border northwest of Glacier Bay (Campbell and Dodds, 1983). Metamorphic relations are the same as for Devonian to Ordovician sedimentary and volcanic rocks (DOsv)CDOcDDevonian to Ordovician ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.-s}brewIWKWLWNWOWPWQWSWTWUWVWWWZW[W\W^W`WaWdWfWgWhWiWjWlWnWoWpWsWuWvWwWxWyWzW{W|WWWWWWWWWWWWWWWWWbritishpWrWuWvWyWbrothersWbuddingtonQWTWnWoWpWWWburntTWburrellWbutWWXWlWtWbyNWWWXW[WfWhWkWlWoWpWqWuWvWxW}WWWWWWWWWWWWcMWXWnWsWuWWWWcalc-silicateWWcalcareousLWTWUWZWwW|WcalledlWWWcambrianWWWcampbellMWNWOWPWuWvWyWzWWcanadaWcanalQWSW\WdWpWxWWcanal-terraceWcanneryVWZW`WtWuWWcapdWdWdWdWdWdWdWWdWdW_Wconsistsof1greenschist-faciesmassivetothin-beddedmarb\V ‚SA2822, 1983); (3) unnamed rocks in the Etolin-Kupreanof Islands region and adjacent areas of mainland (Brew and others, 1984; Buddington and Chapin , 1929); (4) the Douglas Island Volcanics and the Brothers Volcanics (part of Stephens Passage Group) on and near Admiralty Island (Lathram and others, 1965) and in the Juneau area (Ford and Brew, 1973, 1977; Brew and Ford, 1985); and (5) part of the now-abandoned Berners Formation (strata reassigned, in part, to the Douglas Island Volcanics) nortD@hwest of Juneau (Knopf, 1912; Martin, 1926; Brew and Ford, 1985) CKJsvDCretaceous and Jurassic EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚SA28222822$JintertonguingWintofWhWWWintrudeWintrudedpWWintrusionsWintrusivegWkWnWoWqWuWyWWWWWWWWWWirvineWWWisLWNWWWXWfWnWoWpWuWvWwWyW}WWWWWWWisalndWWislandIWKWLWNWQWSWTWUWVWWWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWrWsWuWvWwWxWyWzW|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW0/p‚oB slate assigned to unit contains Late Triassic fossils near Juneau (Brew and Grybeck, 1984, p.31), and marble intercalated with metavolcanic rocks contains Permian and Permian (?) fossils near Juneau, along coast southeast of Juneau, and in Endicott Arm (Buddington and Chapin, 1929, p.73, 119; Ford and Brew, 1973; Brew and Grybeck, 1984, p.30-31). Minimum depositional age constrained by interbedded Cretaceous to Permian sedimentary rocks (KPs) and by crosscutting Late Cretaceous intrusive C=bodies (unit Kgt) Consists of unnamed rocks on Revillagigedo Island (Berg and others, 1978, 1988) and on mainland east of Kupreanof Island (Brew and others, 1984), east of Admiralty Island (Brew and Grybeck, 1984; Buddington and Chapin, 1929), and east of Juneau (Ford and Brew, 1973, 1977; Brew and Ford, 1977, 1985)CKPvDCretaceous to PermianEVolcanic rocks 3,lynnQWSW\WdWpWxWWmWWmackevettuWvWWWWWWWWWWmaficVWiWkWmWnWuWyWWWWWQWRW\WnWoWpWsWmainlyyWmakeQWmanyHWuWmapQW\WnWpWuWvWyWzWmappednW~WmarbleVWWW\WdWfWnWoWqWsWtWuWvWyWzW}WmarginnWmarincovichLWmarineHWJWLWNWQWeW}WmarinegraywackeandmudstonesubordinateconglomerateandaQVmartinQWRWmassiveWW\W^WdWfWkWwWmassivelimestoneandminordolomitecontaininglight-grayc^Vmassivethintothick-beddedlocallyreefoidallight-graylifVmassivetothick-beddedlimestoneandminordolomiteinmostWVmategraywackenWmaterial}Wmatrix}WmaximumqWmayKW\WlWnWoWpWqWuWxWzW|WmcclellandVWdWmdsvuWmedium-bedded\W^Wmelange}W~Wh‚dAThin-bedded to massive, gray limestone and minor shale interbeds. Unit consists of (1) the Upper and Middle (and probably upper Lower) Devonian Wadleigh Limestone in west-central Prince of Wales Island region (Eberlein and others, 1983; Savage and Gehrels, 1984); (2) unnamed Lower Devonian limestone on east-central Prince of Wales Island (Eberlein and others, 1983); (3) unnamed Middle and Lower Devonian limestone and marble in belt of disrupted rocks (units KDsd and KDvd) on Kupreanof IslaBnd (Brew, 1982; Brew and others, 1984; McClelland and Gehrels, 1987); (4) upper part of the Cedar Cove Formation (Upper and Middle Devonian) on Chichagof Island (Loney and others, 1975); (5) the Black Cap Limestone (Middle Devonian) in Glacier Bay (Rossman, 1963; Brew and others, 1978); and (6) strata correlative with the Black Cap Limestone in Chilkat Range and along west shore of Lynn Canal (Lathram and others, 1959; Loney and others, 1975; Brew and Ford, 1985)CDcD Devonian ‚fAMassive, thin- to thick-bedded, locally reefoidal, light-gray limestone and subordinate shale and polymictic conglomerate. Unit consists of (1) unnamed Silurian limestone and marble on Dall and Long Islands (Eberlein and others, 1983; Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, 1984); (2) part of the Upper and Lower Silurian Heceta Limestone Of Prince of Wales Island (Eberlein and others, 1983; Brew and others, 1984); (3) the Upper Silurian Kuiu Limestone and limestone layers inB the Upper and Lower Silurian Bay of Pillars Formation on Kuiu Island (Muffler, 1967; Brew and others, 1984); (4) the Kennel Creek Limestone (Devonian and (or) Silurian; the Silurian age is favored by Loney and others, 1975), and limestone layers in the Upper (?) Silurian Point Augusta Formation on Chichagof Island (Loney and others, 1975); (5) the Willoughby Limestone, Pyramid Peak Limestone, and limestone layers in the Tidal Formation (all considered to be Silurian by Rossman, 1963) in t‚UABasaltic pillow flows, pillow breccia and breccia; rhyolitic tuff with calcareous interbeds, flow breccia, and banded ash-flow tuff, and subordinate andesitic breccia and aquagene tuff. Rocks in most areas are moderately recrystallized and deformed. Fossils from interbedded rocks or from conformable adjacent strata indicate deposition during Norian and Carnian time. Unit consists of (1) rhyolite (part of the Hyd Group) on Annette Island (Berg, 1982; Gehrels and others, 1987); (2) rhyolite Bx(Puppets Formation; part of the Hyd Group) and basalt (Chapin Peak Formation; part of the Hyd Group) on Gravina Island (Berg, 1982; Berg and others, 1978, 1988; Gehrels and others, 1986, 1987); and (3) rhyolite and subordinate basalt (Keku Volcanics) and basalt and andesite (Hound Island Volcanics; part of the Hyd Group) in Keku Strait (Muffler, 1967; Brew and others, 1984)fCTrvDTriassicE&Volcanic rocks (rhyolitic to basaltic)(twhereQWWWWwhichcW}WWWwhiteWWzWwhitestripeWWwilloughbyfWvWwithIWKWNWOWPWQWUWWWXWYW\WcWdWeWfWiWkWmWnWoWpWqWsWuWvWxWzW{W}WWWWWWWWWWWWWWwithinWwoodsworthWworkpWpWpWpWpWpWpWpWpWpWkjsQkjsvRSkpsnksNksvPkvOlpc^lps]mc_mdsv`pc\psZpv[qsHqtsJqtvIscfscggsosjsosvlsosvcmsovksshsvitrbXtrcWtrsTtrscYtrsvVtrvUtsLtsvMtvKandMWPWSWVWYW`WcWlWmWbasalticUWXWbasalticrocksXVcarbonateWWYW\W^W_WdWfWmWcarbonaterocksWV\V^V_VdVfVclasticYWmWclasticsedimentaryandcarbonaterocksundividedYVclasticsedimentaryvolcanicandcarbonaterocksundividedmV}‚fChe Glacier Bay area (Rossman, 1963; Brew and others, 1978); and (6) unnamed Devonian and Silurian (?) limestone in Chilkat Range (Lathram and others, 1959; Brew and Ford, 1985). Loney and others (1975) report that limestone in the Chilkat Range is lithically similar to the Kennel Creek Limestone and contains similar fossils. On the basis of theseobservations and apparent similarity in stratigraphic position, we interpret limestone in "limestone and marble" and "siliceous argillite and volcDVanic" units of Lathram and others (1959) to be correlative with the Kennel Creek Limestone and limestone layers in the Point Augusta Formation on Chichagof Island. Although stratigraphic relations and fossils indicate that most strata in unit are Silurian in age, deposition of strata in some areas possibly continued into Early Devonian time CScD Silurian ECarbonate rocks ‚JA565BPleistocene to Miocene marine mudstone, siltstone, sandstone, and conglomerate (Yakataga Formation) northwest of Cross Sound (Plafker and Addicott, 1976; George Plafker, written commun., 1984) CQTsDQuaternary and TertiaryESedimentary rocks ks in this unit on Zarembo, Kupreanof, and Kuiu Islands are probably correlative with rocks in the Tertiary volcanic rocks unit (Tv). hCQTvDQuaternary and TertiaryEVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚JA565BPleistocene to Miocene marine mudstone, siltstone, sandstone, and conglomerate (Yakataga Formation) northwest of Cross Sound (Plafker and Addicott, 1976; George Plafker, written commun., 1984) CQTsDQuaternary and TertiaryESedimentary rocks ocks SpercyWperhapsIWQWWWperidotiteWWpermianZW[W\WnWoWpWqWrWsWtWuWvWWWWWperouseWpetersburgWWWWWWWWW~WWWpillarsfWgWhWiWlWpillowUWbWcWkWtWwW}Wpinnacle}WplacenWplafkerJWMWNWOWPWQWWWXWqW}WpleistoceneIWJWpleistocenetomiocenemarinemudstonesiltstonesandstoneaJVplioceneKWplutonskWpointfWhWyWzW|WpolymicticfWgW|WpolymicticpebbleandcobbleconglomerateandsubordinatesegVpomclWpomsvlWpoorlytWporphyriticgWportbWcWpositionfWmWpossiblyQWRWfWhWpotassium-argonkW}Wpre-devoniangWpre-tertiaryrWWpredominantlyuWpresenceeWWprimarilyQWuWzW}WprinceIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlW|W‚ME*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚NA2866ASandstone and mudstone turbidites and subordinate conglomerate (Sitka Graywacke) on Baranof, Chichagof, Kruzof, and Yakobi Islands (Loney and others, 1975; Johnson and Karl, 1985; Decker, 1980) and regionally metamorphosed carbonaceous siltstone, volcanogenic graywacke, mudstone, and minor conglomerate (Valdez Group) north of Cross Sound (Brew and others, 1978; George Plafker, written commun., 1984). Strata are interpreted to be deep-water marine trench, slope-basin, and fan deposits. The ‚NBSitka Graywacke is moderately deformed and disrupted, regionally metamorphosed as high as greenschist facies in some areas, and thermally upgraded to hornblende-hornfels facies locally (Decker and others, 1979; Johnson and Karl, 1985). Common rock types in metamorphosed regions south of Cross Sound include metagraywacke and argillite. Rocks north of Cross Sound are regionally metamorphosed from subgreenschist facies to as high as amphibolite facies, produsing graywacke semischist, phylliteC, slate, and layered schist, semischist, and gneiss (Brew and others, 1978). These metasedimentary rocks are correlated with strata in the Valdez Group to northwest by lithic similarity (Brew and Morrell, 1979) and by stratigraphic continuity (Plafker and Campbell, 1979; Campbell and Dodds, 1983). Early Cretaceous fossils were found in the Sitka Graywacke on Kruzof Island (Reed and Coats, 1941); minimum age of these strata is constrained by Eocene granodiorite (Tgd) on Baranof Island (Loney‚FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A7670ABHornblende gabbro and subordinate hornblende pyroxenite and hornblendite on Sukkwan Island that yielded a Middle Ordovician potassium-argon apparent age (Eberlein and others, 1983) and an undated metagabbro on southern Dall Island interpreted to be correlative (G.E. Gehrels, unpub. data, 1984; Gehrels and Saleeby, 1987b)BCOgbD Ordovician EGabbroFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A8500imapHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmiscellaneousHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWIbasalticIWKWOWQWSWUWXWZW[WbWcWkWlWoWpWqWtWxWWWbasalticandsubordinateandesiticpillowflowsbrecciaaquabVbasalticflowsandflowbrecciagoondipgreenstoneonchichXVbasalticpillowflowspillowbrecciaandaquagenetuffmassikVbasalticpillowflowspillowbrecciaandbrecciarhyolitictUVbasaltic-andesiticbWbasisNWYWfWmWnWqWuWWWWWbatholithsWWWhWiWjWlWuWvWwWxWyWzW|W}WWWbeKWLWNWWWXWZW\WeWfWhWlWmWnWoWqWuWwWxWzW|WWWbeachHWbecauseyWbeds\W_WeWbeenmWnWuWyWbelongSWuWWWbelongingKWhWiWjWqWtWWWbelowoWbeltVWdWuWWWbeneathqWbergIWQWRWUWVWWWYW\WlWnWoWpWrWsWuWWWWWWWWWWS;pre-ordovicianWWpre-permianWpre-tertiaryrWWWWpredominantlyuWpregressivelyWpreliminaryWWpresenceeWWprimarilyQWuWzW}WWWWprimarilyclinopyroxenegenerallyaugitehornblendebiotiteVprimarilyhornblendebiotiteclinopyroxenedioriteandsuborVprinceIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlW|WWWWWWWWWWWWWWWWWWWWWWWWWW9OtypemWWtypesNWOWPWQWVWnWoWtW}WWWWWWWtypicallyWultramaficuWWWWWultramaficintrusivebodiesofmagnetite-bearinghornblendeVuncertainQWunconformablyWunconformitynWundateduWWWWWunderlainqWuWunderlieqWundifferentiatedSWuWundividedaWuW}WWunfossiliferoussW{WunfossiliferousmarbleonmainlandnorthwestofrevillagigedsVsVundividedaWuW}WWunfossiliferoussW{W{W{W{W{W{W{W{W{W{W{W=occurredQWyWWofHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWolderYWWoldestqWwWoligoceneKWMWWWWoligoceneandeocenebasaltandandesiteadmiraltyislandvoKVolistostromalgWhWolivineWWWonIWKWLWNWQWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWsWuWvWwWxWyWzW|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWzWWW;miscellaneousWWWWWWWW \ ‚A8751tacarbonate rocks derived from pre-Tertiary carbonate rocks and carbonate-rich clastic strata during regional amphibolite- and local granulite-facies metamorphism. Found as discontinuous marble lenses, as thick continuous marble layers, and as calc-silicate gneiss. Age constrained by intercalation with pre-Tertiary metasedimentary and metavolcanic rocks (pTmsv) described above. Found in Coast Mountains northeast of Petersburg (Brew and others, 1984) and southeast of Juneau (Brew and GrybB eck, 1984).CpTmcD pre-TertiaryEMetacarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A875151t>‚|BQte and limestone (Rendu Formation) (Rossman, 1963; Brew and others, 1978; Brew and Ford, 1985). Strata in Glacier Bay may be lateral equivalents of the Tidal Formation (Upper Silurian) (units Ss and Sc), the Point Augusta Formation (Upper? Silurian) (unit Ss and Sc) and lower part of the Devonian Cedar Cove Formation (units Dcg and Ds)?CDSscDDevonian and Silurian ESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.[geologicalHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgeologyHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWW‚QCina Island Formation and unnamed strata on Gravina Island (Berg and others, 1978, 1988); (2) unnamed strata on Annette Island, Revillagigedo Island, southern Etolin Island, and adjacent parts of mainland (Berg and others, 1978, 1988; Eberlein and others , 1983); (3) the Seymour Canal Formation (part of the Stephens Passage Group) and its metamorphic equivalents near Etolin and Kupreanof Islands and adjacent areas of mainland (Buddington and Chapin, 1929; Brew and others, 1984); (4) an unnDamed unit of sandstone and mudstone in Keku Strait (Muffler, 1967); (5) the Seymour Canal Formation on Admiralty Island (Lathram and others, 1965), northern Kupreanof Island (Brew and others, 1984), and perhaps near Cape Fanshow (Muffler, 1967; Buddington and Chapin, 1929); (6) the now-abandoned Symonds Formation (strata reassigned to the Seymour Canal Formation) and the Shelter Formation on islands in southern Lynn Canal (Barker, 1957; Brew and Ford, 1985); (7) the Treadwell Slate and unn ‚JFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚KA1059AOligocene and Eocene basalt and andesite (Admiralty Island Volcanics) on Admiralty Island (Lathram and others, 1965); unnamed Oligocene basaltic rocks on islands in Icy Strait (Hudson and others, 1982); basaltic rocks (Cenotaph Volcanics) of Miocene and Oligocene age along coast northwest of Cross Sound (Brew and others, 1978); unnamed Pliocene (?) and Miocene (?) andesite in Glacier Bay (Brew and Ford, 1985); and andesitic to rhyolitic tuff and breccia (Sloko Group) of Eocene age northeaseas! CT+ %+I+' +agraphiticYWoWgravinaQWUWVWWWnWWWWWWgrayWW\WdWuWvWgraywackeNWQWSWZW`WaWcWeWgWhWjWkWlWmWnWpWtWyW}WWWWWWgraywackeandmudstoneturbiditesandsubordinateolistostrohVgraywackemudstoneshalelimestoneandsubordinatemafictoyVgreaternWyVgreaternWnWregionallyNWOWQWmWpWuWvWWWWregionsNWoWrelatedpWWWWWWWrelationsYWfWhWkWpWvWzWWWWWWrelativelyVWnWreliablyVWuWrelictWrendu|WreportfWnWnWnWnWMWNWOWPWQWRWSWUWVWWWZW[W\W`WaWbWdWeWrossmandWfWsaleebyaWbWeWfWsandstoneJWLWMWNWQWSWTWVW]WaWeWsandstoneandmudstoneturbiditesandsubordinateconglomeraNVsavageaWbWdWschistNWOWQWsectionseWsedimentaryPWQWRWTWbWeWsemischistNWVWseparatedVWseymourQWSWshaleLWMWVW_WaWcWdWeWfWshallow-watereWshalyVWshelterQWSWshore\WdWsilberlingYW\WsiltstoneJWLWNWQWTWVWZW]WaWcWeWsiltstoneshalesandstonegraywackeandsubordinatelimestonaVXpartsQWVWWWpassageQWWWpatternqWuWWWpatternsvWWpc[WnWsWuWWpeakUWfWvW}WpebblegWpeliticWpenetratively}Wpennsylvanian]W^WvWwWWperalkalineWperalkalineaegerineandarfvedsonitegranitebokanmountainVperatrovich_WiWlWpillowUWbWcWkWtWplacenWplafkerJWMWNWOWPWQWWWXWqWpleistoceneIWJWpleistocenetomiocenemarinemudstonesiltstonesandstoneaJVplioceneKWplutonskWpointfWhWpolymicticfWgWpolymicticpebbleandcobbleconglomerateandsubordinatesegVpomclWpomsvlWpoorlytWporphyriticgWportbWcWpositionfWmWpossiblyQWRWfWhWpotassium-argonkWpre-devoniangWpre-tertiaryrWpredominantlyuWpresenceeWprimarilyQWuWprinceIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlWW‚QEamed strata near Juneau (Ford and Brew, 1973, 1977; Brew and Ford, 1985); (8) part of the now-abandoned Berners Formation (strata reassigned , in part, to the Seymour Canal Formation) northwest of Juneau (Knopf, 1911, 1912; Martin, 1926; Buddington and Chapin, 1929; Redman, 1984a; Brew and Ford, 1985); and (9) argillite, siltstone, and sandstone of probable Cretaceous and Jurassic age south of Haines (George Plafker, written commun., 1984) sCKJsDCretaceous and Jurassic ESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.Eg‚B(called the Wales metamorphic suite by Gehrels and Saleeby, 1987a) on southern Prince of Wales Island (Eberlein and others, 1983)oCpOmcDpre-Ordovician EMetacarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.Ba!*$&Usoq@% @Y @& @YN-M @EEM @EM @EN-M @EEN-M @EEN-M @EM @EN-M @EE-M @EM @EN-M @EN-M @EN-M @EN-M @EE @E @NkochIWpWrWWWWWWkootznahooKWLWQWkpsoWpWqWsWWWkpsvnWoWqWWWkpsvcWkpvnWpWqWWreanofIWQWTWVWWW\W`WdWnWoWkvPWlackQWlacustrineHWladinianYWladrones^WlateQWTWWWYW_W`WkWnWoWlatestYWnWlathramKWLWQWRWVWZW\WdWfWhWjWlayeredNWlayersfWgWhWleastXWlensesgWhWlessnWlight-gray^W_WfWlimestoneQWTWVWWWYWZW\W]W^W_W`WaWcWdWeWfWgWhWjWmWnWlimitnWlithicNWPWmWlithicallyNWfWnWlocalitiesIWlocallyNWZWfWnWoWlocatednWloneyIWNWWWXW_WaWbWdWeWfWgWhWlongfWkWmWlower[W\W]WaWbWdWeWfWhWjWkWmWlowerpermianbasaltpartofthehalleckformationonnorthe[V3) ‚sA4521(4) Permian limestone; and (5) Carboniferous greenstone, limestone, and clastic sedimentary rocks (Hutchison and others, 1979; Berg and others, 1978, 1988; Souther and others, 1979; Souther, 1971). Rocks locally metamorphosed to semischist, phylite, and schist. Nearby metasedimentary and metavolcanic rocks of pre-Tertiary age (pTmsv) probably consist in large part of higher grade equivalents of these strata. CJMsvDJurassic to Mississippian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚sA452165cMfossilsNWQWUWWWXW^W`WfWhWnWoWuWvW}WWfoundHWIWNWPW]WcWiWmWpWqWrWxWyWWWWWWWWWWWWWfoxlWfragmentaloWfreeburn}WfreshwaterbWxWyWfromNWQWUWVWWWgWiWnWsWuWvWwWxWyWzW}WWWWWWWWWWWWWgoonXWgradeQWVWgraniticgWgranodioriteNWgraphiticYWgravinaQWRWUWVWWWgrayWW\WdWgraywackeNWQWRWSWZW`WaWcWeWgWhWgraywackeandmudstoneturbiditesandsubordinateolistostrohVgreenschistNWQWRWVWiWgreenschist-facies\WgreenstoneRWVWXWiWgroupKWNWOWQWRWUWVWWWgrybeckVW\Wgypsum_WhainesMWQWXWhalleckZW[WhamiltonWWhecetafWgWherreidaWbWhighNWOWVWhigherQWVW71m1971KWjWrWW1972QWYWW1973QWSWnWoWpWWWW1974uWvWWWWWWWWW1975IWNWWWXW_WaWbWdWeWfWgWhWnWqWsWxWyWzW}WWWWWWWWWWW1976JWWWXWqW}W1977NWQWSWWWXWjWnWoWpWqW}WWWWWWWWW1978IWKWLWNWOWPWQWUWVWWWZW[W\WaWbWdWfWhWjWlWnWoWpWrWuWxWyWzW|WWWWWWWWWW~GtertiaryIWnWWWtexasWtgWtgdNWtgtWthannWthatHWKWOWPWVWWWXWYWcWeWfWhWlWmWnWoWpWqWuWvWyWzW}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWZW[W_WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWtWuWvWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWtheirPWrW}WWtherenWWWthermallyNWtheseNWQWRWYWiWkWlWnWoWpWrWtWuWWWWWWtheseobservationsfWtheyxWthickeWWWthick-beddedWW_WfWuWzWthin_WfWuWzW{WWthindiscontinuousunfossiliferouslimestonelayersassociat{Vthintothick-beddeddark-graylimestonesubordinatebedsan_VjasNWOWVWmWnWvWxWzW}WWWWWWWWWWash-flowUWassemblagerW}WWassignqWassignedWWXWYWlWnWoWuW}WWWWassignmentuWassociatednWvW{W|WWWWWassociationWatIWXWaugiteWWaugustafWhWyWzW|WaureoleWbjWlWpWWWWWbandedUWbaranofNWqW}WWWWWbarkerQWSWtWWWWWbarlowtWbasaltIWKWOWUWXW[WbWjWkWrWxWbasaltandbasaltictuffnorthofcrosssoundthataredeforOVOVOVOVOVOVOVOVOVOSunnamedcarbonaceousshalesandstoneandconglomerateofproMVunnameddevonianorsilurianandesiticvolcanicrocksfoundxVunnamedfossiliferousargilliteofcretaceousagevariablymqVunnamedlacustrinefluvialcolluvialglacialbeachandmarinHVunnamedmoderatelydeformedandmetamorphosedgraphiticlimeYVrTWXWbWcWdWfWhWrWtWuWxWuppertriassicconglomeratelimestoneandcalcareoussiltstoTVvaldezNWOWvariablyqWvariousgWuWvaryVWvolcanicIWKWMWOWPWQWRW`WaWeWfWiWkWlWmWnWoWpWrWuWwWxWvolcanicsIWKWRWSWUWcWvolcanogenicNWcWwadleighdWwalesIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlWwasVWweeWfWqWwereIWNWXWeWnWuWvWwestIWTW\WaWdWmWuWvWxWwest-central]W^WaWbWdWwestern_WcWOVRV‚NDy and others, 1975). The Sitka Graywacke and rocks north of Cross Sound are considered to be Cretaceous in age on the basis of these constraints and correlation with lithically similar rocks in the Yakutat Group and Valdez Group (Plafker and others, 1977; Brew and Morrell, 1979)CKsD CretaceousESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚OA2891ABasalt and basaltic tuff north of Cross Sound that are deformed and regionally metamorphosed as high as amphibolite facies (Brew and others, 1978; George Plafker, written commun., 1984). Common rock types include schist, gneiss, and amphibolite (Brew and others, 1978). Correlation with volcanic rocks in Valdez Group to northwest indicates a Cretaceous age (Plafker abd Campbell, 1979; Brew and Morrell, 1979)CKvD Cretaceous EVolcanic rocks H‚FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚PA2865AInterbedded sedimentary and volcanic rocks, and their metamorphosed equivalents, that are correlative and continuous with Cretaceous sedimentary (Ks) and volcanic (Kv) rocks. Found north of Cross Sound (Brew and others, 1978; Brew and Morrell, 1979; Plafker and Campbell, 1979). Age constraints, lithic types, metamorphic characteristics, and regional correlations are similar to those described above for Cretaceous sedimentary (Ks) and volcanic (Kv) rocksCKsvD CretaceousE*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚QA2820s, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚QA282000201havemWnWuWyW}WWWWWhazeltonrWhecetafWgW|WhereinuWherreidaWbWjWheterogeneousWhighNWOWVWmWhigh-gradeWhigherQWVWnWoWrWhighlyqWhillWhimmelbergWWholoceneIWhomogeneousnWk‚nDIsland are locally identical in protolith to Cretaceous and Jurassic strata (unit KJs) on Annette and Gravina Islands; (2) Brew and others (1984) suggest that some rocks in this unit on mainland east of Kupreanof Island may have Cretaceous or Jurassic protolith ages; and (3) Buddington and Chapin (1929, p.74) report that conglomerate and phyllite in this unit on mainland east of Admiralty Island are lithically similar to conglomerate and slate of Cretaceous and Jurassic age (unit KJs) on eEastern Admiralty Island. Contact between rocks of Cretaceous and Jurassic age (units KJs, KJv, and KJsv) and Cretaceous to Permian rocks in this and associated map units (units KPv and KPsv) is located along northeast margin of relatively homogeneous metagraywacke and phyllite . Intrusive bodies of Late Cretaceous age (unit Kgt) place a younger limit on depositional age of these strata. Age of metamorphism and deformation has traditionally been interpreted to be Late Cretaceous and (or) ea0‚nFrly Tertiary (Buddington and Chapin, 1929). However, recognition of (1) an unconformity separating metasedimentary and metavolcanic rocks of probable Triassic or Permian age (unit KPsv) from less metamorphosed Cretaceous and Jurassic strata (unit KJs) northwest of Juneau (Redman, 1984a); and (2) a greater degree of metamorphism and deformation in this unit than in strata of probable Cretaceous and Jurassic age on Revillagigedo Island (G.E. Gehrels, unpub. data, 1984) suggest that some rockGs in this unit may have been metamorphosed and deformed prior to deposition of Cretaceous and Jurassic strata. Consists of unnamed rocks on Revillagigedo Island (Berg and others, 1978, 1988) and on mainland east of Kupreanof Island (Brew and others, 1984), east of Admiralty Island (Brew and Grybeck, 1984; Buddington and Chapin, 1929), and east of Juneau (Ford and Brew, 1973, 1977; Brew and Ford, 1977, 1985) .CKPsDCretaceous to Permian ESedimentary rocks N3layersfWgWhWsW{WWWleastXWlength}WWlensesgWhWWWlessnWWWleucocraticWWleucodioriteWleucogabbroWWleucograniteWleucogranodioriteWlieWlight-gray^W_WfWqWWlimestoneQWTWVWWWYWZW\W]W^W_W`WaWcWdWeWfWgWhWjWmWnWqWrWwWyWzW{W|W}WWWWlimestonesvWqWrWwWyWzW{W|W}WWWWWWW,‚AConsists of (1) leucocratic biotite +/- aegerine +/- arfvedsonite +/- garnet syenite and subordinate leucodiorite on southern Prince of Wales Island (Gehrels and Saleeby, 1986, 1987a); (2) biotite and hornblende trondhjemite on Annette and Gravina Islands and mainland to southeast (Gehrels and others, 1987); and (3) undivided biotite and (or) hornblende syenite and trondhjemite on Chichagof Island (Loney and others, 1975). Silurian age indicated by a minimum potassium-argon apparent age onB Chichagof Island (Lanphere and others, 1965) and by uranium-lead (zircon) apparent ages of rocks from Annette, Gravina, and Prince of Wales Islands and mainland to southeast (Gehrels and Saleeby, 1987a, b; Gehrels and others, 1987)CSstD Silurian ESyenite and trondhjemite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A675060 ‚A2920tamorphosed and moderately deformed diorite and subordinate quartz diorite and gabbro on Annette Island, Revillagigedo Island, and mainland to northwest (Berg and others, 1978, 1988). A small quartz diorite body near northern Annette Island yielded a Cretaceous potassium-argon apparent age; the other bodies are undated. We have assigned a Cretaceous and Jurassic age on the basis of our interpretation that rocks in unit are genetically related to Cretaceous and Jurassic volcanic (KJv) andB sedimentary (KJs) rocks.  CKJdDCretaceous and Jurassic EDiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A29200^hoodjWuWhornblendeWWWWWWWWWWWWWWWWWWWWhornblendeandbiotitedioritejualindioritealongeastshoVhornblendeandbiotitegranodioriteandminorquartzdioriteVhornblendedioriteandgabbrothatgradeslaterallyintograVhornblendedominantbiotite-bearingtonaliteandsubordinateVhornblendegabbroandsubordinatehornblendepyroxeniteandVhornblende-bearingWWWhornblende-hornfelsNWyWhornblenditeWWWhornfelsyWhornfelsicWhoundUWhoundUWUWhydUWVWWWtWuWicyKWidenticalnWimpurejWinHWIWKWLWNWOWQWRWSWUWVWWWXWZW[W\W`WaWbWdWeWfWgWhWmWnWoWpWqWrWsWtWuWvWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWq.‚yC(983). On northeastern Chichagof Island, strata were metamorphosed to hornblende-hornfels facies during emplacement of adjacent Cretaceous intrusive rocks (Loney and others, 1975). Metamorphism in Glacier Bay area is also interpreted to have occurred during Cretaceous time (Brew and others, 1978)CDOsvDDevonian to Ordovician E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.Z ‚A2493984; Grybeck and others, 1977); (3) hornblendite and pyroxene- and hornblende-bearing gabbro on eastern Admiralty Island (Lathram and others, 1965); (4) serpentinized peridotite or pyroxenite on north-central Admiralty Island (Lathram and others, 1965); and (5) peridotite and serpentinite on eastern Baranof Island (Loney and others, 1975). %CKumD Cretaceous EUltramafic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A24933rtheIWKWLWNWQWSWUWVWWWXWYWZW[W_WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWtWuWvWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWtheirPWrW}WWWtherenWWWthermallyNWtheseNWQWYWiWkWlWnWoWpWrWtWuWWWWWWWWWtheseobservationsfWtheyxWthickeWWWthick-beddedWW_WfWuWzWthin_WfWuWzW{WWthindiscontinuousunfossiliferouslimestonelayersassociat{Vthintothick-beddeddark-graylimestonesubordinatebedsan_V_V_VwrangellIWWWXWqWwrittenJWMWNWOWQWXWuW}WWWWWwrittern}WyakatagaJWyakobiNWXWqWyakutatNW}WyieldWWWWWyieldednWwWWWWWWWWWWWyieldsXWWWyoungernWuWyoungestwWzaremboIWVWWzarembo-kuiuLWzenWzirconWWWWWWWzone}Wdcddcgedoczdosvydsadsc{dssc|dsvcxdvbjgrjmsvrjtjtrdkdkdbkdsdkdvdkgkgbkgtkjdkjgbkjsQkjsvRSkpsnkpsvpkpsvcqkpvoksNksm~ksvPksvm}kumkvOkvmlpc^lpdsvwlps]mc_mdsv`pc\pomcpomsvpsZptmcptmsvpv[qsHqtsJqtvIscfscggsosjsosvlsosvcmsovksshsvitgtgbtgdtgrtgttkgtkttrbXtrcWtrocvtrosvuV‚XA4420ABasaltic flows and flow breccia (Goon Dip Greenstone) on Chichagof and Yakobi Islands that were deposited, at least in part, in subaerial environments (Loney and others, 1975; Johnson and Karl, 1985) and unnamed basalt near Haines (Plafker and Hudson, 1980; Redman and others, 1984; E.C. Robertson, written commun., 1984; Davis and Plafker, 1985). The Goon Dip Greenstone is assigned a Triassic (?) age by Loney and others (1975), but Plafker and others (1976) and Jones and others (1977) suggeosited, at least in part, in subaerial environments (Loney and others, 1975; Johnson and Karl, 1985) and unnamed basalt near Haines (Plafker and Hudson, 1980; Redman and others, 1984; E.C. Robertson, written commun., 1984; Davis and Plafker, 1985). The Goon Dip Greenstone is assigned a Triassic (?) age by Loney and others (1975), but Plafker and others (1976) and Jones and others (1977) suggegge)‚tAAndesitic to basaltic pillow flows, breccia, and tuff; felsic tuff; graywacke, mudstone, shale, chert, conglomerate, and carbonate; and the metamorphic equivalents of these strata. Unit consists of the Barlow Cove Formation (Barker, 1957) and strata belonging to the Hyd Formation (Upper Triassic) and the Cannery Formation (Lower Permian) (Lathram and others, 1965). Phyllite, greenstone, greenschist, and marble are common rock types in this unit, but nature and age of metamorphism are poorlBy knownCTrPsvDTriassic and Permian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.gC‚qBhat the oldest rocks in this unit are found beneath nearby Triassic basaltic rocks (Trb) and may be equivalent to Permian strata that underlie correlative Triassic basaltic rocks in Wrangell Mountains of southern Alaska (Plafker and others, 1976; Jones and others, 1977). Found on Chichagof, Baranof, and Yakobi Islands. Strata in this unit are probably not correlative with rocks belonging to other Cretaceous to Permian units (units KPs, KPv, and KPsv). Areas that may be underlain by a signiCDficant proportion of intrusive rock are shown with a stipple pattern CKPsvcDCretaceous to Permian E3Clastic sedimentary, volcanic, and carbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.#‚VA4471ABlack shale, shaly limestone, siltstone, sandstone, conglomerate, and limestone; felsic, intermediate, and mafic flows; and minor black chert. Rocks vary from relatively unmetamorphosed to as high as greenschist facies. Common rock types in higher grade areas include phyllite, slate, semischist, marble, greenschist, and greenstone. Unit consists of (1) the Nehenta Formation and other strata (parts of the Hyd Group) on Annette and Gravina Islands (Berg and others, 1978, 1988; Gehrels and oreenstone. Unit consists of (1) the Nehenta Formation and other strata (parts of the Hyd Group) on Annette and Gravina Islands (Berg and others, 1978, 1988; Gehrels and o ot‚TAUpper Triassic conglomerate, limestone, and calcareous siltstone and sandstone (Burnt Island Conglomerate) west of Etolin Island (Karl, 1984) and on northwestern Kupreanof Island (Muffler, 1967); unnamed silty limestone of Late Triassic age on small island between Etolin Island and northern Prince of Wales Island (Brew and others, 1984); and unnamed conglomerate and sedimentary breccia of probable Late Triassic age on east-central Prince of Wales Island (Buddington and Chapin, 1929; EberleB.in and others, 1983; Gehrels and others, 1987)CTrsDTriassicESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚UA4474Bj_annetteQWUWVWWWbWlWnWWWWWWannette-gravinaaWbWlWnWWWWWWWWsunnamedcarbonaceousshalesandstoneandconglomerateofpro@unpub@upper@we@(where@wrangell@zoned@trpc@zconglomeratic@bsedimentary@ultramafic@<>@?1992@1:600000@walaskaf|rbergHe@g@gehrelsygehrelsgeandberghc1992geologyofsoutheasternalaskageological@geologyh@investigationXmap@miscellaneousof@nscale|series@southeasternnsurvey@u southeasternnsurvey@u outheasternnsurvey@u F‚lC:on northern Prince of Wales Island (Brew and others, 1984)CSOsvDSilurian and Ordovician E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚mA6800AInterbedded graywacke, mudstone, mafic to felsic volcanic rocks, and limestone that have been regionally metamorphosed as high as greenschist facies (Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, 1984). Found along west coast of Dall Island and on Long Island and interpreted to be coeval with nearby Lower Silurian to Lower Ordovician rocks of the Descon Formation (units SOv, SOs, and SOsv) on the basis of similarities in stratigraphic position and lithic type (Gehrels and Saleeby,B( 1987b; G.E. Gehrels, unpub. data, 1984)CSOsvcDSilurian and Ordovician E>Clastic sedimentary, volcanic, and carbonate rocks, undivided k‚nA5010ACarbonaceous shale, mudstone, and graywacke; subordinate limestone, chert, conglomerate, and mafic volcanic rocks; minor felsic volcanic rocks; and the metamorphosed and deformed equivalents of these rocks. Regional metamorphic grade in these strata and in associated Cretaceous to Permian volcanic and sedimentary rocks (units KPv and KPsv) generally increases from subgreenschist or greenschist facies on southwest to amphibolite facies toward northeast. There are also significant changes inits KPv and KPsv) generally increases from subgreenschist or greenschist facies on southwest to amphibolite facies toward northeast. There are also significant changes in2P‚vACarbonate rocks regionally metamorphosed to gray marble (MacKevett and others, 1974; Lathram and others, 1959; Brew and Ford, 1985; Redman and others, 1985). Fossils of Pennsylvanian (?) or Permian (?), Paleozoic (?), and Devonian (?) or Silurian (?) age were recovered from unit west of Haines (MacKevett and others, 1974) and fossils of probable Mississippian age were recovered from marble in associated Triassic to Ordovician strata (unit TrOsv) (Redman and others, 1985). Adjacent units inB British Columbia consist of carbonate rocks of Triassic, Devonian, Silurian, and Ordovician age (Campbell and Dodd, 1983). Age of strata in unit on Admiralty Island (referred to as part of Gambier Bay Formation) is constrained by stratigraphic relations with Triassic to Ordovician clastic strata (unit TrOsv). Regional map patterns suggest that most carbonate rocks in this map unit are probably of Silurian age and correlative with the Kennel Creek, Pyramid Peak, and Willoughby Limestones (s'carnianUWXWcarterjWcdgWcedaraWdWeW|WcenomanianQWcenotaphKWcentraleWgWjWkWchangesnWchannelpWchapinQWTWUWnWoWpWWWcharacteristicsPWWWchertVWZW\W^W_W`WgWjWnWpWqWtWuWwW}WWWchert-pebble]Wcherty\WchichagofNWWWXW_WaWbWdWeWfWgWhWqWyWzW}WWWWWWWWWchilkatdWfWhWuWxWyW{WWWchitistoneWWchrisWchuckWWcitedWclarkjWclasticKW[WhWlWnWoWrWuWvW|WWclasticsedimentaryrockssubordinatemafictofelsicvolcanuVuVcolumbia-alaskarWuWcommonNWOWRWVWnWoWtWcommunJWMWNWOWQWXWuWconformableUWconglomerateJWLWMWNWQWTWVWZW\W]WaWcWeWfWgWhWjWlWnWrWtW|WofnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWsHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWscaleHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W{W{WWWWWureportedLWZWreportsWrepresentspWresembleWretreatuWrevilagigedoWrevillagigedoIWQWYW\WnWoWpWrWsWWWWWWWWrhyoliteUWbWrWrhyoliticIWKWUWriverWrobertsonMWXWuWWWrockNWOWQWVWnWoWqWtWuWWWWWrocksIWKWMWNWOWPWQWSWUWVWWWZW[W\W`WaWbWdWeWgWhWiWkWlWmWnWoWpWqWrWsWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWrossmandWfWhW|W|W|W|W|W|W|W|W|W|W|W|W|W|WgWjWqWrW|WsandstoneandmudstoneturbiditesandsubordinateconglomeraNVsavageaWbWdWscgWiWvWyWzW|Wscg|WschistNWOWQWnWoWqWrWuWyW}WWkssubordipV ‚WCon northern Kuiu and Kupreanof Islands (Muffler, 1967; Brew and others, 1984); and (3) the Whitestripe Marble on Chichagof Island (Loney and others, 1975; Johnson and Karl, 1985)CTrcDTriassicECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚fFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.u+sedimentaryPWQWTWbWeWgWhWiWkWnWoWpWrWsWuWzW|W}WWWWWWWWWseeoWWsemipeliticWsemischistNWVWrWWWWseparatedVWseparatingnWserpentiniteWserpentinizedWseveral}WWWseymourQWSWshaleLWMWVW_WaWcWdWeWfWjWnWpWtWyWshalemudstonegraywackeandesiticorbasalticrockssubordipVshallow-watereWpV1‚gA6618APolymictic pebble and cobble conglomerate and subordinate sedimentary breccia, olistostromal deposits, sandstone, graywacke, mudstone, and limestone. Clasts consist of porphyritic andesite, limestone, graywacke, mudstone, granitic to gabbroic intrusive rocks, chert, and other rocks derived from various pre-Devonian units. Unit consists of layers and lenses of polymictic conglomerate in (1) unnamed units on northern Prince of Wales Island (Brew and others, 1984); (2) the Heceta Limestone (uUnit consists of layers and lenses of polymictic conglomerate in (1) unnamed units on northern Prince of Wales Island (Brew and others, 1984); (2) the Heceta Limestone (u(ue‚uAClastic sedimentary rocks, subordinate mafic to felsic volcanic rocks, thin- to thick-bedded gray carbonate, chert, and minor ultramafic rocks that have been regionally metamorphosed to slate, phyllite, greenschist, schist, gneiss, and marble in many areas. Age and grades of metamorphism have not been reliably determined. Rocks assigned to unit on Admiralty Island belong to the Gambier Bay Formation, the Retreat Group, and the "undifferentiated metamorphic rocks" and the "migmatite, gneissB, and feldspathic schist" units of Lathram and others (1965). Devonian fossils were recovered from marble in the Gambier Bay Formation; the Retreat Group is inferred to be Devonian in age on the basis of correlation with the Gambier Bay Formation; and the undivided metamorphic rocks are undated (Lathram and others, 1965). The Triassic to Ordovician age assignment on Admiralty Island reflects our interpretation that this map unit consists primarily of regionally metamorphosed and deformed sh‚eA6937AConglomerate and sedimentary breccia interbedded with sandstone, siltstone, shale, and minor graywacke, limestone, and volcanic rocks. Sedimentary structures and presence of red beds and thick sections of coarse conglomerate suggest that strata in Prince of Wales Island region were deposited in subaerial to shallow-water marine environments (Ovenshine, 1975; Gehrels and Saleeby, 1987a). Strata on Chichagof Island were probably also deposited in a shallow-water marine environment (Loney ao shallow-water marine environments (Ovenshine, 1975; Gehrels and Saleeby, 1987a). Strata on Chichagof Island were probably also deposited in a shallow-water marine environment (Loney a aQ‚iA6740AMafic to intermediate volcanic breccia, agglomerate, and flows and greenschist and greenstone derived from these rocks. Found with Silurian sedimentary (Ss) and carbonate rocks (Sc) belonging to the Bay of Pillars Formation on southern Kuiu Island (Brew and others, 1984)CSvD Silurian EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚jA6690AMudstone and graywacke turbidites, subordinate conglomerate, sandstone, and shale, and minor limestone, chert, and basalt flows and breccia. Unit consists of (1) unnamed strata of probable Early and Silurian to Middle Ordovician age on Sukkwan and Dall Islands (Eberlein and others, 1983; Gehrels and Saleeby, 1987b; G.E. Gehrels, unpub. data, 1984); (2) unnamed strata of Silurian and (or) Ordovician age on Forrester Island (Clark and others, 1971); (3) Lower Silurian to Lower Ordovician str+xsiltyTWwWsilurianfWhWiWjWkWlWmWuWvWxWyWzW{W|WWWWWWWsimilarNWPWfWnWoWpWWWWWsimilaritiesmWWWsimilarityNWfWsWsitkaNW}WskagwayWWWslateNWQWSWVWYWZWnWoWuWyWWslicexWslightlyYWYWZWnWoWuWyWWslicexWslightlyYWYWYWYWsoutheasternnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWherasternWWWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWuHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWD ‚jBata belonging to the Descon Formation and unnamed units on southern Prince of Wales Island (Eberlein and others, 1983; Gehrels and Saleeby , 1987a, b; Herreid and others, 1978); (4) part of the Lower Silurian to Lower Ordovician Descon Formation on central and northern Prince of Wales Island (Eberlein and others, 1983; Brew and others, 1984); and (5) thin-bedded black argillite, black chert, and black impure limestone of Ordovician age (Hood Bay Formation) on southern Admiralty Island (LatC$hram and others, 1965; Carter, 1977)CSOsDSilurian and OrdovicianESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚kA6712JjuneauKWQWSWnWoWrWWWWWWjurassicQWnWrW}WWWWWWWWWWWWWWkarheenaWeW|WkarlNWTWWWXWqW}WWWWWWWkasaanbWkdWWkdsdVWdWuWkdvdVWdWuWkekuQWUWVWWWZWkelp}WkennelfWgWvWketchikanWWWkgWWkgbWWkgtnWoWWkhaz}Wkilometers}WWkjdWkjgbWkjsSWnWWWWWWWkjsvnWWkjvSWnWWWWWWklawak]WklukwanWknopfQWWWknownQWnWtWuWwWWWWWWWW‚cASiltstone, shale, volcanogenic graywacke, conglomerate, and minor limestone that are interbedded with basaltic pillow flows, breccia, and aquagene tuff. Unit consist of the Coronados Volcanics (Devonian), the Devonian (?) St. Joseph Island Volcanics, and part of the Upper Devonian Port Refugio Formation, all of which are found on western Prince of Wales Island and adjacent islands (Eberlein and others, 1983)CDsvD Devonian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚dA6938vGonnorth-centralprinceofwalesislandunitconsistsofunn|V gehrelsyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgehrelsgeandberghc1992geologyofsoutheasternalaskaHVIVJVKVLVMVNVOVPVQVSVTVUVVVWVXVYVZV[V\V]V^V_V`VaVbVcVdVeVfVgVhViVjVkVlVmVnVoVpVqVrVsVtVuVvVwVxVyVzV{V|V}VVVVVVVVVVVVVVVVVVVVVVVVVVVV@{conspicuousWconstrainedNW[WkWoWvW}WWWWWWconstraintsNWPWWWcontactnWcontainKWWWcontaining]W^WWWWcontainsfWoWWcontiguousyWcontinuedfWhWcontinuityNWcontinuousPW}WWcoreWcornwallisWWcoronadoscWcorrelatedNWcorrelationNWOWQWWWuWcorrelationsPWaAgroupKWNWOWQWUWVWWWlWrWuW}WWWWWWgrybeckVW\WnWoWpWuWWWWWWWWgypsum_WhnWsWWhainesMWQWXWuWvWWWWWhalleckZW[WhamiltonWWhammarstromWhasnWWWWWf} ‚\A5765wer Permian basalt (part of the Halleck Formation) on northern Kuiu Island (Muffler, 1967) and unnamed Permian basaltic (?) rocks northeast of Glacier Bay (Brew and others, 1978). Age constrained by interbedded Lower Permian clastic strata (unit Ps) on Kuiu Island and interbedded Permian carbonate rocks (Pc) in Glacier Bay area. MCPvDPermianEVolcanic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚\A57651Q‚hAGraywacke and mudstone turbidites and subordinate olistostromal deposits, layers, and lenses of limestone, and conglomerate. Unit consists of (1) most of the Bay of Pillars Formation (Upper and Lower Silurian) on northern Prince of Wales Island and Kuiu Island (Brew and others, 1984); (2) the Upper (?) Silurian Point Augusta Formation on Chichagof Island (Loney and others, 1975); (3) the Upper Silurian Tidal Formation in Glacier Bay (Rossman, 1963; Brew and others, 1978); and (4) clastic sB~edimentary rocks belonging to the Devonian and Silurian (?) units of Lathram and others (1959) in the Chilkat Range (interpreted to be Upper Silurian by Loney and others, 1975, and Brew and Ford, 1985). Although stratigraphic relations and fossils indicate that most strata in unit are Silurian in age , deposition of strata in some areas possibly continued into Early Devonian timelCSsD Silurian ESedimentary rocks 4mesozoicqWWmetabasaltkWmetacarbonateWWmetacarbonaterocksderivedfrompre-ordoviciancarbonateroVmetacarbonaterocksderivedfrompre-tertiarycarbonaterockVmetachertWmetagabbrooWpWWmetagraywackeNWnWmetamorphicPWQWkWlWnWrWtWuWyWzW}WWWWWWWWmetamorphismQWnWoWpWtWuWyWWWWWWWWmetamorphosedNWOWPWQWSWYWZWlWmWnWoWpWqWrWuWvWyWzW}WWWWWWWWmetamorphosedandmoderatelydeformeddioriteandsubordinatVVVpartKWQWUWVWXWZW[WaWcWdWfWjWkWlWpWrWuWvWxWzW|W}WWWWWWWWV%1983IWMWNWQWTW]W^W_WaWbWcWdWeWfWgWjWkWlWuWvWyWzW|WWWWWWWWWWWWWWWW1984IWJWLWMWNWOWQWTWUWVWWWXWZW\W^W`WaWdWfWgWhWiWjWkWlWmWnWoWpWsWuWwWxW}WWWWWWWWWWWWWWWWWWWWWW1984aQWnWpWWW1984buW1985IWKWNWQWSWWWXW\WdWfWhWnWoWpWqWuWvWxWyW{W|W}WWWWWWWWWWWWWW1985aW1985bWWWWjWlW5QWRWdWfWjWlW6QWdWfW7QW74nW8QW9QWaOWWWXW\WeWnWabdOWabovePWaddicottJWadjacentQWRWUWcWadmiraltyKWLWQWRWVWZW\WjWnWafterQWAourqWuWWWovenshineeWoverlainWoverlieWpnWoWWpaleoceneLWQWpWWWWWpaleogeneMWpaleozoicqWuWvWWWWWE‚^A6030ARMassive limestone and minor dolomite containing light-gray chert nodules (Ladrones Limestone) on west-central Prince of Wales Island (Eberlein and others, 1983) and unnamed, medium-bedded to massive crinoidal limestone on northern Kuiu Island (Brew and others, 1984). Fossils indicate deposition during Middle and Early Pennsylvanian timeRCPacDPennsylvanian ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚_A6340rlein and others, 1983) and unnamed, medium-bedded to massive crinoidal limestone on northern Kuiu Island (Brew and others, 1984). Fossils indicate deposition during Middle and Early Pennsylvanian timeRCPacDPennsylvanian ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚_A6340UcfetolinQWTW\WsWWWetolin-kupreanofWWexampleWexperiencedWW;xrecognizedIWWrecordWrecoverednWuWvWWrecrystallizedUWpWredeWredmanQWXWlWnWpWuWvWWWWWWWreedNWreefoidalfWreferredvWWrefers}WreflectsuWrefugiobWcWregionLWdWeWWWWregionalPWQWYWnWoWvWWWWWWWWWWWWWWWWWilarityNWsitkaNWslateNWslokoKWslope-basinNWsomeNWsoundJWKWLWNWOWPWsouthNWsoutheasternHWsoutherKWsouthernIWstraitKWstrataKWNWstratigraphicNWsubgreenschistNWsubordinateMWNWtertiaryIWtgdNWthatHWKWOWPWtheIWKWLWNWtheirPWthermallyNWtheseNWthisIWtoIWJWKWLWNWOWtopsyKWLWtrenchNWtsKWtuffKWOWturbiditesNWtvIWtypesNWOWPWunitIWKWunnamedHWIWKWMWu‚eBnd others, 1975). Unit consists of the Lower Devonian Karheen Formation on southern Prince of Wales Island (Gehrels and Saleeby, 1986, 1987a) and on central Prince of Wales Island (Eberlein and others, 1983), and conglomeratic rocks in the Cedar Cove Formation on Chichagof Island (Loney and others, 1975) that we interpret to be generally correlative with the Lower Devonian Karheen FormationwCDcgD Devonian EConglomeratic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚fA6960‚{A6932BThin, discontinuous, unfossiliferous limestone layers associated with Devonian and Silurian volcanic rocks (DSv) in the Chilkat Range (Lathram and others, 1959; Brew and Ford, 1985)CDScDDevonian and Silurian ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚|A6953AOn north-central Prince of Wales Island unit consists of unnamed limestone, sandstone, calcareous mudstone, and polymictic conglomerate interpreted to be facies equivalents of the Silurian Heceta Limestone (unit Sc), associated Silurian clastic strata (units Ss and Scg), and the Lower Devonian Karheen Formation (unit Dcg) (Eberlein and others, 1983). In Glacier Bay, unit consists of unnamed clastic sedimentary and minor carbonate and volcanic rocks and of Devonian and (or) Silurian argilli953953[manyHWuWWWmapQW\WnWpWuWvWyWzWWWWmappednWWWmarbleVWWW\WdWfWnWoWqWsWtWuWvWyWzW}WWWWWWWmarginnWmarginsWmarincovichLWmarineHWJWLWNWQWeW}WWmarinegraywackeandmudstonesubordinateconglomerateandaQVmartinQWWmassiveWW\W^WdWfWkWwWmassivelimestoneandminordolomitecontaininglight-grayc^Vmassivethintothick-beddedlocallyreefoidallight-graylifVmassivetothick-beddedlimestoneandminordolomiteinmostWVmategraywackenWmaterial}Wmatrix}WWmaximumqWmayKW\WlWnWoWpWqWuWxWzW|WWWWWWWmcclellandVWdWWWmdsvuWWWmedium-bedded\W^Wmelange}WWWWWWWWv‚AConsists of (1) Late and Middle Ordovician diorite and quartz diorite and Early Silurian to Late Ordovician biotite quartz monzonite on Prince of Wales Island (Gehrels and Saleeby, 1987a; Eberlein and others, 1983; Saleeby and others, 1984; Lanphere and others, 1964); (2) Early Silurian to Late Ordovician diorite, quartz diorite, and their metamorphosed and deformed equivalents on Gravina, Annette, and Duke Islands (Gehrels and others, 1987); and (3) layered and foliated quartz diorite andB@ diorite on southern Dall Island and in small area (near Ruth Bay) on southern Prince of Wales Island (Gehrels and Saleeby, 1986, 1987a). These rocks are interpreted to be genetically related to Early Silurian and Ordovician volcanic rocks (units SOv and SOsv) (Eberlein and others, 1983; Gehrels and Saleeby, 1987a, b).CSOqDSilurian and Ordovician EQuartz diorite F‚_AfThin- to thick-bedded, dark-gray limestone, subordinate beds and nodules of light-gray chert, and minor shale and gypsum, unit consists of the Peratrovich Formation on western Prince of Wales Island (Eberlein and others, 1983) and the Iyoukeen Formation on Chichagof Island (Loney and others, 1975). Strata deposited during Late and Early Mississippian timefCMcD MississippianECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.MGgeochemicalWWgeologicQWWWWgeorgeJWMWNWOWQW}WWglacialHWglacierKWZW[W\WdWfWhWuWxWyWzW|W}WWWWglaucophane-schist}WgneissNWOWQWnWoWqWuWyW}WWWgoonXWgradationalWgradeQWVWnWoWrW}WWgradesuWWgraniteWWWgraniticgW}WgranodioriteNWWWWWWWWWWWWWWgranodioriticqWgranofelsyWgranuliteWgranulite-faciesW-‚A2340AAndesite to basaltic flows, flow breccia, agglomerate, and tuff (generally containing conspicuous clinopyroxene phenocrysts), subordinate graywacke and mudstone, and regionally metamorphosed and deformed equivalents of these strata. Greenschist facies metamorphism in some areas yielded common rock types of greenstone and greenschist. Age constrained by intertonguing stratigraphic relations with Cretaceous and Jurassic sedimentary rocks (KJs). Geologic and geochemical considerations suggesreenschist. Age constrained by intertonguing stratigraphic relations with Cretaceous and Jurassic sedimentary rocks (KJs). Geologic and geochemical considerations sugges‚APyroxenite, hornblendite, and related ultramafic rocks on southern Prince of Wales Island (MacKevett, 1963; Gehrels and Saleeby, 1986, 1987a), on southern Dall Island (G.E. Gehrels, unpub. data, 1984), and on east-central Prince of Wales Island (Loney and others, 1987). Ultramafic rocks on southern Prince of Wales Island are interpreted to be Silurian on the basis of gradational relations with syenitic rocks of Silurian age (Sst). The intrusive body on Dall Island yielded a Late OrdovicianB potassium-argon (hornblende) apparent age (M.A. Lanphere, written commun., 1984). An Early Silurian potassium-argon (biotite) apparent age has been determined on the body on east-central Prince of Wales Island (Loney and others, 1987)CSOumDSilurian and OrdovicianEUltramafic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A7650_howevernWWhudsonKWXWhutchisonpWrWWhydUWVWWWtWuWicyKWidenticalnWimpurejWinHWIWKWLWNWOWQWSWUWVWWWXWZW[W\W`WaWbWdWeWfWgWhWmWnWoWpWqWrWsWtWuWvWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW(upperTWXWbWcWdWfWhWrWtWuWxW|WWuppertriassicconglomeratelimestoneandcalcareoussiltstoTVuranium-leadWWWWWWWWvaldezNWOWvariablyqWvariousgWuWvaryVWvolcanicIWKWMWOWPWQW`WaWeWfWiWkWlWmWnWoWpWrWuWwWxWyWzW{W|W}WWWWWWWWWWWWWvolcanicsIWKWSWUWcWWvolcanoclasticWvolcanogenicNWcWwadleighdWwalesIWTW\W]W^W_WaWbWcWdWeWfWgWhWjWkWlW|WWWWWWWWWWWwaningWwasVWzWwaterfallWzWzW}‚\C,re in map area (Silberling and others, 1982)CPcDPermian ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚]A6031BMiddle and Lower Pennsylvanian sandstone and siltstone containing minor limestone and chert-pebble conglomerate (Klawak Formation). Unit found on west-central Prince of Wales Island (Eberlein and others, 1983)CPasD PennsylvanianESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.X ‚A1655rnblende -dominant, biotite-bearing tonalite and subordinate quartz diorite found as steeply dipping, foliated, and locally lineated sills in Coast Mountains (Brew and Ford, 1981). Found near Ketchikan (Berg and others, 1978, 1988; Elliott and Koch, 1981), near Petersburg (Brew and others, 1984), near Juneau (Brew and Grybeck, 1984; Brew and Ford, 1977, 1985), and north of Haines (MacKevett and others, 1974; Redman and others, 1984; E.C. Robertson, written commun., 1984; Barker and otherBs, 1986). Field and uranium-lead (zircon) data indicate emplacement in Paleocene and Late Cretaceous time, during waning stages of deformation and metamorphism in Coast Mountains (Gehrels and others, 1984; Brew and Ford, 1981). CTKtDPaleocene and Cretaceous E Tonalite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A1655‚A16626 ‚APrimarily clinopyroxene (generally augite) +/- hornblende +/- biotite +/- olivine gabbro, leucogabbro, and subordinate norite, syenite, and pyroxenite. Found on Prince of Wales Island (Eberlein and others, 1983), Kuiu Island (Brew and others, 1984), and Chichagof Island where it is associated with Early Cretaceous granodiorite (unit Kg) and diorite (unit Kd) (Loney and others, 1975; Johnson and Karl, 1985). As described above for the Cretaceous granodiorite unit (Kg), some rocks in this unB;it may be of Late Jurassic or of Silurian or Ordovician age)CKgbD Cretaceous EGabbroFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2990   eandberghc1992geologyofsoutheasternalaskaVcaleWHWWWWeriesWseriesHWWseriesHWWurveyWrveyHWWWWHWuHWWWWuHWWWWuHWW bergHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWcHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWeHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgehrelsHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWxWxWVIVJVKVLVMVNVOVPVQVRVSVTVUVVVWVXVYVZV[V\V]V^V_V`VgVnVoVpVqVrVsVtVuVvVwVzV}V~VVVVVVVVVVVVVVVVVVVVVVW DYrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.?w1992HWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWalaskaHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWg‚OFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.  ‚LA500 of Juneau (Brew and Ford, 1985; Souther, 1971). Volcanic rocks northwest of Cross Sound are interbedded with clastic strata belonging to the Topsy Formation (unit Ts) (Brew and others, 1978), and the Admiralty Island Volcanics contain clastic strata that may be in part correlative with the Kootznahoo Formation (unit Ts) (Lathram and others, 1965). OCTvDTertiaryEVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚LA500d0‚`A5930ATuffaceous argillite and graywacke and subordinate chert, limestone, and andesitic volcanic rocks (Cannery Formation) on northern Kupreanof Island (Muffler, 1967; Brew and others, 1984). Fossils are Late Devonian and Early and Late Mississippian in age (Jones and others, 1981)CMDsvDMississippian and Devonian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚aA6939 G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚aA69393737T‚XB,st that the Goon Dip Greenstone is probably correlative with the Upper and (or) Middle Triassic Nikolai Greenstone in the Wrangell Mountains of southern Alaska. Basalt near Haines yields Carnian fossils and is also interpreted by Davis and Plafker (1985) to be correlative with the Nikolai GreenstoneCTrbDTriassicEBasaltic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.$‚ADiverse assemblage of generally foliated and layered granodiorite, quartz monzonite, tonalite, and their metamorphic equivalents. May include a significant component of pre-Tertiary metasedimentary and metavolcanic rocks (pTmsv) in some areas. Where recognized, such areas are indicated by a stipple pattern. Constraints on age provided by crosscutting Eocene granodiorite plutons (Tg) and the interpretation that some rocks in this unit have experienced regional early Tertiary to Late CretaceBous metamorphism (Forbes and Engels, 1970; Smith and Diggles, 1981). We suggest, however, that most rocks in this unit are correlative with rocks in the Paleocene granodiorite and tonalite unit (unit Tgt). Found in Coast Mountains east and north of Ketchikan (Berg and others, 1978, 1988; Elliott and Koch, 1981), east of Petersburg (Brew and others, 1984), east of Admiralty Island (Brew and Grybeck, 1984), and in Skagway area (Barker and others, 1986)CTKgDPaleocene and Cretaceous seriesHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWofHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWmWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWWsHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WgWhWiWnWoWpWqWrWsWtWuWvWwWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWWscaleHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WgWhWiWnWoWpWqWrWsWtWuWvWwWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWWW ‚uA5200desitic to basaltic pillow flows, breccia, and tuff; felsic tuff; graywacke, mudstone, shale, chert, conglomerate, and carbonate; and the metamorphic equivalents of these strata. Unit consists of the Barlow Cove Formation (Barker, 1957) and strata belonging to the Hyd Formation (Upper Triassic) and the Cannery Formation (Lower Permian) (Lathram and others, 1965). Phyllite, greenstone, greenschist, and marble are common rock types in this unit, but nature and age of metamorphism are poorlB y known. CTrPsvDTriassic and Permian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚uA5200200*6‚DV 1984; Grybeck and others, 1977); (3) hornblendite and pyroxene- and hornblende-bearing gabbro on eastern Admiralty Island (Lathram and others, 1965); (4) serpentinized peridotite or pyroxenite on north-central Admiralty Island (Lathram and others, 1965); and (5) peridotite and serpentinite on eastern Baranof Island (Loney and others, 1975) CKumD Cretaceous EUltramafic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.hHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWi-1867HWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWinvestigationHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWWWWWWW| alaskarWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWandHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbergbergberg#‚WAMassive to thick-bedded limestone and minor dolomite in most areas, but in Keku Strait unit includes thin-bedded, dark-gray limestone, and on Chichagof Isalnd unit consists of massive white to gray marble (Whitestripe Marble). Diagnostic fossils from limestone and dolomite are Late Triassic in age. Marble on Chichagof Island is assigned a triassic (?) age by Loney and others (1975), but is interpreted by Plafker and others (1976) and Jones and others (1977) to be Late Triassic by correlatiBon with the Chitistone Limestone in the Wrangell Mountains of southern Alaska. Plafker and others (1976) and Jones and others (1977) also suggest that the Whitestripe Marble is not correlative with other carbonate rocks included in this unit. Unit consists of (1) limestone and marble (parts of the Hyd Group) on Annette and Gravina Islands (Berg and others, 1978, 1988; Berg, 1982; Gehrels and others, 1987); (2) the Cornwallis Limestone and Hamilton Island Limestone (parts of the Hyd Group) uWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWaddicottJWadjacentQWUWcWpWvWyWWWWWWWWadmiraltyKWLWQWVWZW\WjWnWoWpWuWvWWWWWWaegerineWWWafterQWWWWWWWoC‚By and volcanic rocks (Trsv), Permian carbonate rocks (Pc), and Devonian carbonate rocks (Dc) enclosed in a matrix of strata belonging to the Stephens Passage Group (Lower Cretaceous and Jurassic, unit KJs) and perhaps the Cannery Formation (Mississippian and Upper Devonian, unit MDsv) or other Mesozoic or Paleozoic units (Brew, 1982; Brew and others, 1984; H.C. Berg, unpub. data, 1978; McClelland and Gehrels, 1987)CKDsdDCretaceous to Devonian ESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2972‚AMetacarbonate rocks derived from pre-Tertiary carbonate rocks and carbonate-rich clastic strata during regional amphibolite- and local granulite-facies metamorphism. Found as discontinuous marble lenses, as thick continuous marble layers, and as calc-silicate gneiss. Age constrained by intercalation with pre-Tertiary metasedimentary and metavolcanic rocks (pTmsv) described above. Found in Coast Mountains northeast of Petersburg (Brew and others, 1984) and southeast of Juneau (Brew and GrybB eck, 1984)CpTmcD pre-TertiaryEMetacarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.+‚Eup (Woodsworth and others, 1983, p.13; Hill, 1985a), and strata of probable Permian (Hill, 1985b) and pre-Permian age (Hutchison, 1982); and (5) map patterns suggesting that rocks in unit were derived in part from nearby Jurassic to Mississippian sedimentary and volcanic rocks (JMsv). Regional metamorphism apparently occurred (1) during early Tertiary to Late Cretaceous time (Forbes and Engels, 1970; Smith and Diggles, 1981; Gehrels and others, 1984); (2) after deposition of sedimentary anFd volcanic rocks of probable Triassic or Permian age (belonging to map unit KPsv) and prior to deposition of Cretaceous and Jurassic strata (unit KJs) (see discussion of Cretaceous to Permian sedimentary rocks, KPs); (3) in part prior to Late Triassic time (Souther, 1971; Brew and others, 1985); and (4) perhaps during mid-Paleozoic to Proterozoic or other time. Unit consists of unnamed rocks in Coast Mountains east of Ketchikan (Berg and others, 1978, 1988; Elliott and Koch, 1981), east of |seriesWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWsoutheasternHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWWWWWWWWWWWWWWWWWsurveyHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WgWhWnWoWpWqWrWsWtWuWvWwWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWWuHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WgWhWnWoWpWqWrWsWtWuWvWwWyWzW}W~WW‚@A\CE‚B‚@B/‚@A.‚Am‚A]‚A!‚AX‚@AE$‚B‚B‚B*D‚@AZC"‚A‚A‚A6‚@A0‚A.‚@GF‚E‚@F,‚A‚A‚AF‚Ay‚@xF-‚@BDH‚FDH‚F,S‚A3620AHornblende and biotite granodiorite and minor quartz diorite (part of Texas Creek Granodiorite of Berg and others, 1977) norheast of Revillagigedo Island (Berg and others, 1978, 1988) that yielded a latest Triassic potassium-argon (hornblende) apparent age (Smith and Diggles, 1981)CTrgD Triassic E Granodiorite estigation Series Map I-1867, scale 1:600,000.‚A3620AHornblende and biotite granodiorite and minor quartz diorite (part of Texas Creek Granodiorite of Berg and others, 1977) norheast of Revillagigedo Island (Berg and others, 1978, 1988) that yielded a latest Triassic potassium-argon (hornblende) apparent age (Smith and Diggles, 1981)CTrgD Triassic E Granodiorite , 1977) norheast of Revillagigedo Island (Berg and others, 1978, 1988) that yielded a latest Triassic potassium-argon (hornblende) apparent age (Smith and Diggles, 1981)CTrgD Triassic E Granodiorite orite orite ;‚EDiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A4320BTwo-pyroxene gabbro on Duke Island (Irvine, 1974) and Percy Islands (Berg and others, 1978, 1988) that yields a Late Triassic uranium-lead (zircon) apparent age (Gehrels and others, 1987)CTrgbDTriassicEGabbroFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.investigationXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW\W]W^W_W`WgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWWmiscellaneousHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWyWzW}W~WWWWWWWWWWWWWWWWWWWWWWWWW‚UFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000. DgeologyWWWWWWWWWWWBygehrelsgeandberghc1992geologyofsoutheasternalaskaVVVVVVVVVVVelsgeandberghc1992geologyofsoutherasternalaskVTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgeologyHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWW*\@E Sedimenatry X!Vag`P!j#a?#e>#@$A$aB'fD'sC4QY5E5H5F5G6QI6aJ91 93 9QZ9v 9w9 :1L:a6:d7:8:9:KENE!MG1QJOQT1PU1U UUUV2,qtvIVqtsJg`tvK!jtsLatsvMPksN9w kvO9 ksvP9v kjsQ91 kjsvS93 trsTUtrvUUtrsvVUtrcWUtrbXU1trscYQpsZhwpv[i!pc\hvpas]qBpac^qAmc_tQmdsv`jAdsazJdvbAdsvcz9dcdzIdcgezHscfzq scggw)!sshw*"svixQ#sosjw$sovk# surveyHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWuHWIWJWKWLWMWNWOWPWQWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}WWWWWH‚Bt that some volcanic rocks in this unit are genetically related to Early Cretaceous ultramafic bodies (unit Kum) (Irvine, 1973, 1974) and possibly to Early Cretaceous and (or) Jurassic diorite (KJd) and gabbro (KJgb) (Berg and others, 1978, 1988). Unit consists of (1) volcanic rocks (Gravina Island Formation) on Gravina Island (Berg and others, 1978, 1988); (2) unnamed rocks on Annette and Revillagigedo Islands and adjacent areas of mainland (Berg and others, 1978, 1988; Eberlein and otherCs, 1983); (3) unnamed rocks in the Etolin-Kupreanof Islands region and adjacent areas of mainland (Brew and others, 1984; Buddington and Chapin , 1929); (4) the Douglas Island Volcanics and the Brothers Volcanics (part of Stephens Passage Group) on and near Admiralty Island (Lathram and others, 1965) and in the Juneau area (Ford and Brew, 1973, 1977; Brew and Ford, 1985); and (5) part of the now-abandoned Berners Formation (strata reassigned, in part, to the Douglas Island Volcanics) north&% Usoq‚LANonmarine sandstone, shale, and conglomerate (Kootznahoo Formation) in the Zarembo-Kuiu Islands region (Brew and others, 1984) and on Admiralty Island (Lathram and others, 1965), and marine calcareous sandstone and siltstone (Topsy Formation) of Miocene age northwest of Cross Sound (Brew and others, 1978; Marincovich, 1979). Age of the Kootznahoo Formation is reported to be Eocene and Paleocene in the Zarembo-Kuiu Islands region and Miocene to Eocene on Admiralty Island (Brew and others, 1B984). CTsDTertiaryESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚MA794BUnnamed carbonaceous shale, sandstone, and conglomerate of probable Paleogene age and subordinate Oligocene volcanic rocks near Haines (George Plafker, written commun., 1984; E.C. Robertson, written commun., 1984; Campbell and Dodds, 1983).CTsvD Tertiary b‚IBxott and others, 1981) and on Kruzof Island (Loney and others, 1975), and basaltic rocks of Holocene and (or) Pleistocene age are found on southern Kupreanof Island (Brew and others, 1985, 1985) and perhaps at other localities. Most volcanic rocks in this unit on Zarembo, Kupreanof, and Kuiu Islands are probably correlative with rocks in the Tertiary volcanic rocks unit (Tv)fCQTvDQuaternary and TertiaryEVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚I‚J@F‚KB ‚L@A‚ME‚NBD‚OF‚P@‚QACE‚S@A‚TA‚UAF‚V@B#‚WA C‚X@B‚Y@TE(‚[Af‚\@A}C‚^@‚_A‚`@‚aAd‚b@iA‚cA‚dAEh‚e@B‚fACF‚g@B1‚hAFQ‚i@‚jB‚kADCR‚l@KAFC‚mF‚n@BkDFF0‚oBF/‚p@ B'Fg‚qB‚r@B3‚s@A)‚tA‚u@ACeE2‚vACP‚w@‚xA4‚yAqC‚z@A‚{@‚|B‚}@tBDpF2‚Bo‚B ‚AC‚A#CEG+‚@A ‚mFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.%Y, OO;‚KBat of Juneau (Brew and Ford, 1985; Souther, 1971). Volcanic rocks northwest of Cross Sound are interbedded with clastic strata belonging to the Topsy Formation (unit Ts) (Brew and others, 1978), and the Admiralty Island Volcanics contain clastic strata that may be in part correlative with the Kootznahoo Formation (unit Ts) (Lathram and others, 1965). OCTvDTertiaryEVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.]Xr‚ABiotite-dominant, hornblende-bearing granodiorite and tonalite containing local foliation and layering. Uranium-lead (zircon) data indicate emplacement during Paleocene time (Gehrels and others, 1984). Found in Coast Mountains east of Petersburg (Brew and others, 1984), east of Juneau (Brew and Ford, 1977, 1985; Gehrels and others, 1984), and near Skagway (Barker and others, 1986)CTgtD Paleocene EGranodiorite and tonalite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A1662ZZ‚Ctam and others, 1965), Chichagof Island (Loney and others, 1975; Johnson and Karl, 1985), north of Cross Sound (Decker and Plafker, 1982; George Plafker, written commun., 1984), in Glacier Bay area (Brew and others, 1978), and in Chilkat Range (Lathram and others, 1959; Sonnevil 1981; Brew and Ford, 1985; MacKevett and others, 1974; E.C. Robertson, written commun., 1984)PCKgD Cretaceous E Granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2540 ‚VBthers, 1987); (2) unnamed strata in the belt of disrupted rocks (unit KDsd and KDvd) on Kupreanof and Zarembo Islands (Brew, 1982; Brew and others, 1984; Berg and Grybeck, 1980; McClelland and Gehrels, 1987); and (3) the part of the Hyd Formation (Hyd Group of Muffler, 1967, in Keku Islet area) on Admiralty Island that was reliably separated from the Cannery Formation (unit Ps) (Lathram and others, 1965)CTrsvD Triassic E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚WA4473‚E Granodiorite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A2480ASmall plutons to batholiths of granodiorite, tonalite, and subordinate quartz monzonite to quartz diorite and diorite. Most bodies contain biotite and hornblende, many have magmatic epidote and garnet and are plagioclase porphyritic, and some contain pyroxene and (or) muscovite. Potassium-argon and 40Ar/39Ar, and uranium-lead apparent ages of these bodies are generally Late Cretaceous (Smith and Diggles, 1981; Brew and others, 1984; Sutter and Crawford, 1985; Rubin and Saleeby, 1987). UnitpUaVogbWcdgXnmYkjv4QZksm9Q*$x#%sosvlw&sosvcmy'kpsna!(kpvob)kpsvpa"*kpsvcqc+jmsvrc,trpcsV2-trpsvtcq.trosvuc/trocvw(0padsvwq1dsvx12dosvy3doczw'4dsc{zC5dssc|zd6ksvm}:a7kvm:d8kdsd:9kdvd::ptmsv#a;ptmc#qtgb#e?tgr#a@tgd#Atg$Btgt$aCtkt'sDtkg'fEkgt5Fkdb5Gkum5Hkg5Ikd6QJkgb6aKkjd:Lkjgb:1MjgrE!NjtEOjtrdJPtrgbT1QtrgG1RppasyiSsstxATsoumxaU g‚pB and metavolcanic rocks intruded by deformed and metamorphosed gabbro (recrystallized to amphibolite) that is apparently related to foliated Paleocene and Cretaceous tonalite (TKt) (G.E. Gehrels and J.B. Saleeby, unpub. data, 1984). The Work Channel amphibolite to southeast in British Columbia (Hutchison, 1982) and some amphibolite in Cretaceous to Permian map units to northwest may consist in part of correlative metagabbro. Unit found on (1) Revillagigedo Island and adjacent areas of mainC6land to southeast (Berg and others, 1978, 1988) and northwest (Elliott and Koch, 1981); (2) mainland east of Admiralty Island (Buddington and Chapin, 1929; Brew and Grybeck, 1984; Brew and Ford 1977, 1985; Ford and Brew, 1973, 1977); and (3) east side of Lynn Canal (Buddington and Chapin, 1929; Redman, 1984a)CKPsvDCretaceous to PermianE*Sedimentary and volcanic rocks, undivided Tf‚YE3Clastic sedimentary and carbonate rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚ZA5766ABlack argillite, graywacke, calcareous siltstone, chert, and minor basaltic rocks, limestone, and conglomerate. Unit consists of (1) part of the Halleck Formation of Early Permian age near Keku Strait (Muffler, 1967; Brew and others, 1984; Jones and others, 1981); (2) the Cannery Formation on southern Admiralty Island (reported to be Early Permian in age, Lathram and others, 1965); and (3) unnamed Permian strata northeast of Glacier Bay (Brew and others, 1978). Strata locally metamorphosedB to slate and phylliteCPsDPermian ESedimentary rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚[A5810H‚sANUnfossiliferous marble on mainland northwest of Revillagigedo Island (H.C. Berg, unpub. data, 1975) and on and northeast of Etolin Island (Brew and others, 1984). Age inferred from similarity with Triassic and Permian marble layers included in units of Cretaceous to Permian sedimentary rocks (KPs) and of Permian carbonate rocks (Pc)NCTrPcDTriassic and (or) Permian ECarbonate rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚tA5260&a!'a")b(c.cq-c+c*hvhwi!iRjAqAqBq0tQw'3w(/w) w*!w%w#x#$xASxQ"xaTy&z9zC4zHzIzJzd5zq11A2aUVWb<c=#a:#q;qsH!qtvIVqtsJg`tvK!jtsLatsvMPksN9w kvO9 ksvP9v kjsQ91 kjsvS93 trsTUtrvUUtrsvVUtrcWUtrbXU1trscYQpsZhwpv[i!pc\hvpas]qBpac^qAmc_tQmdsv`jAdsazJdvbAdsvcz9dcdzIdcgezHscfzq scggw)!sshw*"svixQ#sosjw$sovk ‚G( Petersburg (Brew and others, 1984; Souther and others, 1979), near Tracy Arm (Brew and Grybeck, 1984), near Juneau (Ford and Brew, 1973; Brew and Ford, 1977, 1985; Souther and others, 1979), southeast of Haines (Souther and others, 1979; Werner, 1978), and near Skagway (Redman and others, 1984) CpTmsvD pre-TertiaryE&Metasedimentary and metavolcanic rocksFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.Y‚FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A5875ASyenite on Sukkwan Island that contains biotite +/- amphibole +/- aegerine +/- augite and yielded potassium-argon apparent ages of Early Permian (hornblende) and Late Pennsylvanian (biotite) (Eberlein and others, 1983). This body is apparently correlative with syenitic plutons in the Saint Elias mountains region of southern Alaska that yield a Late Pennsylvanian potassium-argon (hornblende) apparent age (MacKevett and others, 1986)CPPasyDPermian and (or) PennsylvanianESyeniteFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A6730x‚FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.mE‚ABiotite +/- hornblende +/- pyroxene granite, alkali granite, quartz monzonite, and subordinate syenite, granodiorite, and diorite. Unit consists of (1) stocks on mainland southeast of Revillagigedo Island that yield potassium-argon apparent ages of early Miocene and Oligocene (Berg and others, 1978, 1988); (2) large plutons of Miocene and (or) Oligocene age on Etolin, Zarembo, Kupreanof, and Kuiu Islands (Brew and others, 1984); and (3) part of the Oligocene Tkope River intrusions along AlBhaska-British Columbia border north of Glacier Bay (MacKevett and others, 1974; Campbell and Dodds, 1983)VCTgrDMiocene and Oligocene EGranite FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A1273‚B Revilagigedo Island and adjacent area of mainland yield potassium-argon apparent ages of early Miocene and late Oligocene (Smith and Diggles, 1981), and large body (La Perouse gabbro) northwest of Cross Sound yields a 40Ar/39Ar apparent age of Oligocene (Loney and Himmelberg, 1983) CTgbDMiocene and Oligocene EGabbro FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000..‚ATwo-pyroxene gabbro and subordinate hornblende +/- biotite gabbro and diorite. These intrusive rocks generally found adjacent to and intruded by Early Cretaceous zoned ultramafic bodies (unit Kum). Found on mainland near Myers Chuck (Ruckmick and Noble, 1959; Eberlein and others, 1983). We have assigned a Cretaceous and Jurassic age on the basis of our interpretation that rocks in unit are genetically related to Cretaceous and Jurassic volcanic (KJv) and sedimentary rocks (KJs)CKJgbDCretaceous and Jurassic EGabbroFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚A3410F‚gBYnit Sc) and the Bay of Pillars Formation (unit Ss) on central and northern Prince of Wales Island (Eberlein and others, 1983; Brew and others, 1984); (3) the Kuiu Limestone (unit Sc) and the Bay of Pillars Formation on Kuiu Island (Brew and others, 1984); and (4) the Kennel Creek Limestone (unit Sc) on Chichagof Island (Loney and others, 1975)GCScg D Silurian EConglomeratic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚hA6619ek‚uE[nterpreted to be predominantly correlative with sedimentary and volcanic rocks of Permian, Devonian, and Silurian age in Glacier Bay (Brew and others, 1978) and in the Chilkat Range (Lathram and others, 1959; Brew and Ford, 1985) and of Triassic to Ordovician age along British Columbia-Alaska border north of Glacier Bay (Campbell and Dodd, 1983) CTrOsvDTriassic to OrdovicianE)Sedimentary and volcanic rocks, undividedFGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚vA6617‚rB; (4) Permian limestone; and (5) Carboniferous greenstone, limestone, and clastic sedimentary rocks (Hutchison and others, 1979; Berg and others, 1978, 1988; Souther and others, 1979; Souther, 1971). Rocks locally metamorphosed to semischist, phylite, and schist. Nearby metasedimentary and metavolcanic rocks of pre-Tertiary age (pTmsv) probably consist in large part of higher grade equivalents of these strataCJMsvDJurassic to Mississippian E*Sedimentary and volcanic rocks, undivided FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.q‚xAUnnamed Devonian or Silurian andesitic (?) volcanic rocks found in a fault slice on northern Kuiu Island (Muffler, 1967; Brew and others, 1984); unnamed Devonian and Silurian basaltic and (or) andesitic rocks in Glacier Bay (Brew and others, 1978); and unnamed Devonian (?) and Devonian to Silurian (?) basalt and andesite in the Chilkat Range and along west shore of Lynn Canal (Lathram and others, 1959; Loney and others, 1975; Brew and Ford, 1985). Volcanic rocks in Glacier Bay and in ChilkB at Range may be in part or entirely correlative with the Upper Devonian Freshwater Bay Formation (unit Dv) or Volcanic rocks of Silurian age (units Sv or SOv), or, as suggested by Brew and Ford (1985), they may range in age from Middle Devonian through Late SilurianCDSvDDevonian and Silurian EVolcanic rocks FGehrels, G.E., and Berg, H.C., 1992, Geology of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1867, scale 1:600,000.‚yA7200