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MLabelNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unitA&AjNSAmod+A"#$o Description0A)+,.r Minimum ageu Maximum agexQclass9A 23456 @B#"{@B#"{@fAL  !%&'(*-/01LB#"{@      /  #$ "! +.),( rs m @@B s@ A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMpq< 243651 qt R F $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMsu R K $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMtv R Q $,.YesNo/,  , : AM PMR $,.YesNo/,  , : AM PMS $,.YesNo/,  , : AM PMT $,.YesNo/,  , : AM PMU $,.YesNo/,  , : AM PMuw R V $,.YesNo/,  , : AM PMW $,.YesNo/,  , : AM PMX $,.YesNo/,  , : AM PMY $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PMvx R [ $,.YesNo/,  , : AM PMf\ $,.YesNo/,  , : AM PMf] $,.YesNo/,  , : AM PMf^ $,.YesNo/,  , : AM PMf_ $,.YesNo/,  , : AM PMfwy  ` $,.YesNo/,  , : AM PMA)x  x) ){ {) )k k) )[ [) )K   K)   xz  B)  )Y   Y) )  )g g) )* *) ) )8 C8) ) ) s  s)  ) c  c)   ) S  S)   )   ) a y}  DD a)   @BBfA> >                      /24356$"#.5jmm@jt@pl@:tial@trut@andesite@{basalt@beach@deposits@flat@fossiliferous@gabbroic@gemukmountainpluton@-granitic@2hoare@Aintrusive@ljurassiclaminatedtuffsandassociatedrocks@ kuskokwimgroupchert-clastprovenancerocksdeltaicfacies@@kuskokwimgroupchert-clastprovenancerocksouter-fanturbi@0little@.maficintrusiverocks@metervik@morainal@older@plain@rhyoliteanddacitetuff@Xrocks9Qsand@2sedimentaryrocksofsummitisland@semiconsolidatedmarinebeachdeposits@silt@surficial@tholeiitic@tikchikterranemelange@Ktuffandsedimentaryrocks@Tunconsolidated@Tunconsolidated@ssicjurassicandjurassic@late@,Dlatecretaceous@+maastrichtian@paleocene@paleoceneandcretaceous@zZJ  }g@FK_mv}ACEjCHMRW\AC @D IDIGD"A%K(A-I1C5A7B:J?DCNINLEQDUC~X@AYA[D`BeCiDmAnFpDsDwD{B~C€A€B€A€F € A € A € D€A€A€F€B€D €A!C"€A'C(€ A)C*€"E/€%D4€'A;€)@=D?€,AC€/CHCH?€,AC€/CHE/€%D4€'A;€(A=€)D?€,AC€/CHH @@@ MARIA A!zg $ )+,UC QuaternaryDBasaltic flows and sills. Flows range in thickness from 20 cm to 7 m or more. Some are vesicular, some dense. Compositionally they are basalt and olivine hylobasanite, alkalicGPI002H330IPribilof IslandsJIgneousK450N4500VB!Basaltic flows, St. George IslandC QuaternaryDBasaltic flows and sills. Flows range in thickness from 20 cm to 7 m or more. Some are vesicular, some dense. Compositionally they are basalt and olivine basanite, alkalicGPI002H331IPribilof IslandsJIgneousK450N4500WB!Hylobasanitic flows, Otter IslandC QuaternaryD;Lava flows of hylobasanite at leaat 325 feet thick, alkalicGPI002H332IPribilof IslandsJIgneousK450N4500bh003Vbh004!6?EZx|}',OȂςЂт҂ӂՂւׂقڂbi001bi002_-bi003#'.5cm002acm003OS\cehgo001go0027Pj!1578T]|}‚ɂ̂go005 Xm6BakmsxzÂgo006+> )2jpv{Ăgo008 3=Chg001hg0028FQk9?U^qu~EV .earlyWWWWWWWW)€A$Two U/Pb age of igneous protolith of 2.06 Ga from zircon. Nd/Sm isotopic systematics indicate that the rocks formed at 2 Ga. Amphibolite-facies metamorphism U-Pb age of 1.78 Ga from sphene. Cretaceous overprinting of most K/Ar ages suggest thermal/dynamothermal event between 120 to 150 Ma$GBH002H9420IBethelJ MetamorphicK9420€ApCmBMetamorphic complexC preCambrianDCoarse-grained pink gneiss and medium- to coarse-grained light- to dark-gray schist constituting a sequence of highly sedimentary, volcanic, possibly some intrusive rocksGBH004H39420IBethelJ MetamorphicK9420€AKCggB3Gemuk Group, graywacke, siltstone, and conglomerateC$Early Cretaceous to Mississippian(?)#coarse-grainedporphyritictoseriateleucocraticbiotitegrVcoarselyWWWWcoarsening/thickeninWW WcoastBWCWDWcoatedqWcobbleWWWWWWWcodedWcoeval7WWWcogeneticrWWWW WWWWWcoherentlyaWbWcWdWeWfWgWhWiWjWcoherentlydeformedvolcaniclasticturbiditessoutheastofraVbVcVdVeVfVgVhViVcollapsewWcolluvialBWFWcolluviumCWDWEWIWwWxWyW|WWcolumbiaPWcolumnarPWQWXWYW{Wcolumnar-jointedRWSW[W\W]W^WgWhWiWqWyWzWWWcolumnar-jointedandesiteflowscappingsmallhillsthatovezVcombinationWWP9€AEFGHIJKNOPRSVWXYZ[\wƂǂȂ΂ςЂт҂ӂՂւׂقڂ8poorlytowell-sortedsandandgravelwithsomesiltandaf@predominantly@bpredominately@Jprehnite@prennite-pumpellyite@primarily@Npyrite@raised@ree@9replacement@right@\ropy@s3@"schistosecalcareoussiltstonelimestoneandgreenishtuffac@ scoriaceous@ scrap@sedimentaryrocks@serpentiniteserpentinizedduniteandwebsteriteultramafic@steriteultramafic@gpA Rock agesB   @?A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMbVpoorlytowell-sortedsandandgravelwithsomesiltandafEVpoorlytowell-sortedsiltgravelandbouldersinterracesaBVCVpoorlytowell-sortedsiltsandgravelandboulders~Vpoorlytowell-sortedsiltsandgravelandbouldersstipple{V}VporphyriesWWrWsWtWuWWWWWporphyriticjWkWlWmWnWoWxW|WWWBWCWDWEWFWLWMWPWWWWWporphyriticplagioclase-pyroxeneandesiteflowsandflowbreEVporphyriticpropyliticallyalteredoneandtwo-pyroxeneandeFVporphyry{W}WWportionkWlWpossibly}WWW WWWWpost-metamorphicWWWWpost-triassicmWnWoWpotassiumWpre-consolidationWWpre-metamorphicWWWWpre-valanginiansWtWuWprecludesWominantlyWWpredominantlyaltereddark-greentoalmostblackmaficvolcaVpredominantlyalteredmaficvolcanicrocksofpermianagedaV>'stratigraphicallymWnWoWsuggestWW Wthat5Wthe!W'W,WWthereforemWnWoWthirdaWbWcWdWeWfWgWhWiWjWthismWnWoWthree"Wtithonian[WxWyWzWtoTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWmWnWoWpWvW{WWWWWWWWWWtogiakkWlWtoptWuWvWtriassicWWWWWWWtuffsLWMWturbiditesmWnWoWturonian"W#W%W&W)W*Wtwo#WunitaWbWcWdWeWfWgWhWiWjWrWWunits&Wupper'W,WaWbWcWdWeWfWgWhWiWjWrWWWupperunitofabundantlyfossiliferouswellbeddedsandstonerV  PF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PM K $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM  N  O  P  Q  R  S  T  U  V  W  X  Y[ $,.YesNo/,  , : AM PM] $,.YesNo/,  , : AM PM _ $,.YesNo/,  , : AM PMb $,.YesNo/,  , : AM PMfg $,.YesNo/,  , : AM PMi $,.YesNo/,  , : AM PMj  kl $,.YesNo/,  , : AM PM m $,.YesNo/,  , : AM PMn $,.YesNo/,  , : AM PMo  pq $,.YesNo/,  , : AM PMr  s $,.YesNo/,  , : AM PMt $,.YesNo/,  , : AM PMu   xv $,.YesNo/,  , : AM PMw $,.YesNo/,  , : AM PMx  yfz $,.YesNo/,  , : AM PMf{ $,.YesNo/,  , : AM PMf| $,.YesNo/,  , : AM PMf } $,.YesNo/,  , : AM PMf~ $,.YesNo/,  , : AM PMf $,.YesNo/,  , : AM PMf Ar131f3qE"2-DgHqZ"FQXh^s![(mht%GiBs$ld$4$\(a:(8:X qn  $  $ c C(:6  (:(:%  (: >9s& BqT BV BT B=To "w9( &D{<$ '$%) $*<) +? !,  !-  !. ;   ;/ ; E .CD, 0/EA(1.2/A.(3/6A(4.5/A&(6(p:7(=:c8TB+ FJ9 UGg1: Ug%1;  U*gh1<  Ulg1=  Ug1>  Ug1?  MLabelNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unitA&A jNSAmod+A"#$o Description0A)+,.r Minimum ageu Maximum agexQclass9A 234567 @B#"{@B#"{@fAL  !%&'(*-/01LB#"{@       /  #$ "! +.),( 2 3 4 5 671 @@B s@ A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PM RC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PM RH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PM RM $,.YesNo/,  , : AM PMN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMQ $,.YesNo/,  , : AM PM RR $,.YesNo/,  , : AM PMS $,.YesNo/,  , : AM PMT $,.YesNo/,  , : AM PMU $,.YesNo/,  , : AM PMV $,.YesNo/,  , : AM PM RW $,.YesNo/,  , : AM PMX $,.YesNo/,  , : AM PMY $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PM[ $,.YesNo/,  , : AM PMf U\ $,.YesNo/,  , : AM PMf] $,.YesNo/,  , : AM PMf^ $,.YesNo/,  , : AM PMf_ $,.YesNo/,  , : AM PMf` $,.YesNo/,  , : AM PMf A'x  x' '{ {' 'k k' '[ [' 'K   K'   B'  'Y   Y' '   'gg''**''' C '  '  '   ' E  E'   '   '   '    ' p    p' Dv   ' 3    3' ~   @ @BBfA@ @         U                  /"$#)+,.23456 7  !@A!VDEF(LIST8LISTA8Sedimentary Igneous Metamorphic Unconsolidated Tectonite8VDEFA((FMRLA  A/FMRLFMRLAA6FMRLFMRLA A7FMRLFMRLA A9FMRLFMRLA A?FMRLFMRLAA:FMRLFMRLA  A?FMRLFMRLA   A<FMRLFMRLA   AQFMRLFMRLA AkeyBrefsClithDdescripEageFqkeyGdomlithHMaplabelJAreaK Radiometric` % MARIA nnsakey.FP3 NAMEA nnsakey.FP5 RPTHA NNSAKEY.FP5 WSPCAD:\Databases\A9FPTHRPTH NAME WSPCMARI FPTHADATA:Databases:nsalith.FP5MARIA nsalith.FP3 NAMEA nsalith.FP5 RPTHA NSALITH.FP5 WSPCAE:\Databases\A1 RPTH RolyNAME WSPCNAMEA KBdescrp.FP5 RPTHA KBDESCRP.FP5 RolyAWSPCAE:\E.4\Kusko\FP5\A1RPTH RolyNAME WSPC NAMEA nsaage.fp5 RPTHA NSAAGE.FP5 RolyAWSPCA E:\DB-5\ A1 RPTH RolyNAME WSPC NAMEA nsaqkey.fp5 RPTHA NSAQKEY.FP5 RolyAWSPCA E:\E.1\DB-5\ RPTHRolyNAMEWSPC NAMEAnsadomlith.fp5RPTHANSADOMLITH.FP5RolyAWSPCA E:\E.1\DB-5\   A1 RPTH RolyNAME WSPC NAMEA nsakey.FP5 RPTHA NSAKEY.FP5 RolyAWSPCA E:\E.1\DB-5\ A1RPTHRolyNAMEWSPCNAMEAkbradiometric.FP5RPTHAKBRADIOMETRIC.FP5RolyAWSPCAE:\E.3\Kusko\A1 nRPTH RolyNAME WSPCNAMEA kbradio.FP5 RPTHA KBRADIO.FP5 RolyAWSPCAE:\E.4\Kusko\FP5\ !A!VDEF(LISTILISTAIALT ALT-POT ALT-BIO ALT-SER ALT-ARG HFS HFS-ALB HFS-HBL HFS-PYX HFS-SAN QIVDEFA(( A/FMRLFMRLAA6FMRLFMRLA A7FMRLFMRLA A9FMRLFMRLA A?FMRLFMRLAA:FMRLFMRLA  A?FMRLFMRLA   A<FMRLFMRLA   AQFMRLFMRLA AkeyBrefsClithDdescripEageFqkeyGdomlithHMaplabelJAreaK Radiometric`!ARock class ListB Nsamods list`@  A?FMRLFMRLA  A/FMRLFMRLAA6FMRLFMRLA A7FMRLFMRLA A9FMRLFMRLA A?FMRLFMRLAA7FMRLFMRLA  ASFMRLFMRLA AkeyBrefsClithDdescripEageFqkeyHMaplabelK Radiometric`metric`keyBrefsClithDdescripEageFqkeyHMaplabelJAreaK Radiometric``ClithDdescripEageFqkeyGdomlithHMaplabelJAreaK Radiometric`BUUX  $,.YesNo/,  , : AM PMOHA NSAREFS.FP5 WSPCAH:\NSA\A9FPTHRPTH NAME WSPCMARI FPTHAROCKET2:Databases:nnsakey.FP5MARI70SunMonTueWedThuFriSatJanFebMarAprMayJunJulAugSepOctNovDec1ArialSystemFujiyamaExtraBold Lucida FaxTimes New Roman Helvetica MS Sans SerifLucida HandwritingLucida Calligraphy Arial Narrow Verdana Times Tahoma Courier @   n A1 RPTH RolyNAME WSPCNAMEA kbrefs.FP5 RPTHA KBREFS.FP5 RolyAWSPCAE:\E.3\Kusko\A9FPTHRPTH NAME WSPCMARI FPTHAROCKET2:Databases:nnsakey.FP5MARIMARI FPTHAROCKET2:Databases:nnsakey.FP5MARIcE Pro 2.0 - 2.1cA AzHHzA@Gould H - HP LJ 5M (lj5m1)4C odXXLetterDINU"4A1 BA{d€K2830Group, graywacke, siltstone, and conglomerate.ZEF BD  D I A CCHA FK_ACV@@FKACI B!F#K$A%C&"F(K)b*n+w,B-D.N/B0G1L2R3W4A5C67'@8H;Y<A=C>C?H@MA@CB: KEAFCGD FIKJ_KmLvMBND\@ONPBQGRLSQTVU[9B[@W]@WWH KZ B[F\Y H^Y_A`CaCbJcPd@fe] FhKi_jmkvl}mBnDoFp2rqFsKtQuVv[w`xByDzQfi@K5810‚Ã! Ã!@Ã!`Ã"@ !"#Ã"`$%&'(Ã"p)*+Ã",-./Ã"0Ã#12Ã# 3456Ã#`789:;<=>?Ã$`@Ã%ABCDEÃ90FÃBGHIJÃBKLMÃCNOÃDPQRSTXYZÃF[\]^ÃVUVW_`ÃWpabcdeÄ!4fÄ!5ghiÄ!djklmnoÄ"!pÄ""qÄ"1rÄ$sÄ'tuvwxÄ'yÄ'z{|Ä'6}Ä'Q~Ä'fÄ'gÄ'h Ä'i Ä'qÄ'vÄ'Ä*q Ä*!"#$%&')*+,Ä12-./0Ä2123Ä24Ä2656Ä2a7Ä289:Ä3!=>Ä3q?@ABCDEFGÄ3rHIJKÄ3vLMÄ6!NOÄ6APÄ9CRÄ9SÄ9TUVÄ9WÄ9XÄ:YÄAZÄB1[ÄBA\ÄBa]^_`ÄBbabcdefghijÄBcklÄCAmnopÄCeqrÄCfstuvÄCqwÄD!xyz{ÄDxÃ!Ã! rÃ!0Ã!@Ã!`Ã!p789Ã"1PQÃ"0FÃ"P$Ã"`?@Ã"p)Ã#0NOÃ# bc!Ã#0de5Ã#@7Ã#P89Ã#`:1Ã#TUVÃ$RS]^_Ã$ [\Ã$0]qÃ$@^Ã$`Ã$Ã%AfÃ% ghÃ%0iÃ%`Ã%pÃ%Ã&0Ã&0Ã&`Ã'jklÃ' Ã'0Ã'`Ã'}~Ã'Ã'|Ã1 AÃ10Ã: KÃ:0LÃ:@MÃA TÃA0LÃBGÃB HÃB0IÃB@JÃC )ÃC`2ÃDUÃD VÃD0WÃQsÃW~ÃaXYÃa Ãa0mnoÃaPBCDÃap Ãa6ÃbabcÃb dÃb0eklÃb@fÃbPgÃb`hÃbpirÃbmnoÃcxyÃc zÃc0stÃcPÃcpÃcÃdÃd0ÃdPÃdpÃdÃeÃe0ÃePÃepÃeÃfÃf0ÃfPÃfpÃq@Ãq`Ãq Ãs`;ÃspÃtÃuBÃ@à Ã0%Ã@<ÃP*pDqUnconsolidated alluvial, colluvial, glacial outwash, lacustrine, and eolian conglomerate, sand, silt, and mudrockGBH002H105IBethelJUnconsolidatedK100N1000AQuBUnconsolidated depositsCHoloceneDUnconsolidated depositsGNI003H110INunivak IslandJUnconsolidatedK100N1000AQuBUnconsolidated depositsCHoloceneDUnconsolidated depositsGCM003H110ICape MendenhallJUnconsolidatedK100N1000 AQuBSurficial depositsC QuaternaryDxUndifferentiated fluvial and marine gravel, sand, silt, and mud; organic materials; eolian sand and silt; and colluvium.GKB003H300I Kuskokwim BayJUnconsolidatedK100N1000 BSurficial deposits, undividedC Quaternary?DfAreas on map not assigned to bedrock geologic units, assumed to be surficial deposits. Not described.GGO005H501I Goodnews BayJUnconsolidatedK100N1000 BSurficial deposits, undividedC Quaternary?DfAreas on map not assigned to bedrock geologic units, assumed to be surficial deposits. Not described.GHG003H501bunconsolidatedalluvialcolluvialglacialoutwashlacustrineFVunconsolidateddepositsGVHVunconsolidatedglacialtillgroundlateralandendmoraineszVunderlainlWmWnWunderlainbeolderestuarineandalluvialdepositslVunderlyingaWbWcWyWWW WBWCWDWsWtWuWWWWWWWWWWWWWWWunderneathWndifferentiatedfluvialandmarinegravelsandsiltandmudCVDVEVIVRVSVUVVVundivided^W_WfWgWhWoWunfoliatedWW WunitWXWYWzWW WWW(W1W2W;W<WBWunitsJWKWLWWWW WWBWunsortedWupwWuponLWupperXWYW~WWWW WWW W6WBWuppermostWupwardWW Wvalanginian6WvalleyPWQWvaricolored(W;W<WvariedLW8W9Wvaries,WvarietyWWW WvariousWvaritymWnWvarnish~Wvary'Wvegetal]WverywW&W(W;W<WBW geologicJWKWLWWWghostsWWgiveWWgivenWWglacialFWMWOWPWQWmWnWwWxWyWzW|WW~WglacialdriftdepositedduringthelastthreeglacialadvancwVxVyV|VglaciatedLWglaciofluviatileWglassTWZWsWtWuWglassytWglobermanBWCWDWgneissWWgneissandschistinthekanektokriverregionsedimentaryvVgneissesWgoodnewsbWtWuWWWWWWWgooglefWgWhWoWgradeWWWWgradesrWWWWgradingWWWgrainWWWgrained&WgranitesWWWWW WWWPWWgranitic}WWWWWWW W WWWWWWWhornblendeWWWhornblende-biotiteWhornfelsWWWhotwWhowever@WLWhylobasaniteUWWWhypabyssalrWice-contactWimagefWgWhWoWimpressivepWinpWtWuWvWBWCWUWVWmWnWoWqWrWvWwW}WWWWW IHagemeister IslandJUnconsolidatedK100N1000 BSurficial deposits, undividedC Quaternary?DfAreas on map not assigned to bedrock geologic units, assumed to be surficial deposits. Not described.GNG006H501I Nushagak BayJUnconsolidatedK100N1000 AQcB ColluviumC QuaternaryDtChiefly frost-rived rubble, loccally includes stream alluvium, terrace gravels, glacial deposits, and windblown siltGHG005H607IHagemeister IslandJUnconsolidatedK100N1000AQsBSurficial deposits, undividedC QuaternaryGNG007H701I Nushagak BayJUnconsolidatedK100N1000AQcB ColluviumC QuaternaryDsChiefly frost-rived rubble, locally includes stream alluvium, terrace gravels, glacial deposits, and windblown siltGGO008H707I Goodnews BayJUnconsolidatedK100N1000AQcB ColluviumC QuaternaryDsChiefly frost-rived rubble, locally includes stream alluvium, terrace gravels, glacial deposits, and windblown siltGGO006H807I Goodnews BayJUnconsolidatedK100N1000AQcB ColluviumC QuaternarydepositsBWCWDWEWGWHWIWJWKWLWNWRWSWUWVWWWXWYW\W^W_W`WdWeWfWgWhWiWjWkWlWoWqWrWsWtWuWvWwWxWyW|WAWBWCWDWEWFWGWHWJWMW?W@WAWLWMWdevonianWdevonianlimestoneVdiabasicWWdikesWWdioriteWdismemberedmWnWoWdomeWdomes=W>Wdrift{W}W~WWeekvW{WWeekriverplutonandrelatedplutonicrocksVeekvolcanicfieldandesiteflowsandporphyry{VeekvolcanicfieldrhyolitevVeolianqWrWeoliandepositsqVrVepiclasticWestuarineiWjWkWlWfacies"W#W$W)W*W,WdWeWfWgWhWiWfandWeWfWgWhWiWfelsicjWkWlW}WWWfelsicintrusiverocksjVkVlVfelsicrocks}VfieldpWqWtWuWvWwWyWzW{W=W>WEWFWGWHWIWJWKWfine-grainedIWfisherWfisherdomeandmarvelcreekplutonsundividedVacemVnVmekoryukRWSW[W\W]W^W^W0areasAWJWKWLWaWbWcWtWuWvWWareasnotmappedonsaintmatthewandhallislandsAVareasonmapnotassignedtobedrockgeologicunitsassumedJVKVLVargillaceousmWnWoWWWargillaceousmelangeofblacktogreenweaklytointenselyfVargillite4W:WRWTWUWVWXWvW{WWWWWWWWWWWWWWWWWWWWasXWYWvWwWyW=WHWZW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWuWxWyWzWWWWWWWWWashwWHWash-fallLWMWash-flowpWtWashywWassemblage8W9WaWbWcWdWeWfWgWhWiWjWrWsWtWuWxWyWzWWWWWassemblagesmWnWoWWWWWWWWassignedJWKWLW(W;W<WQWWWassociated@WAWDW}WBWCWDWsWtWuWWWWWWDChiefly frost-rived rubble, but locally includes small amount of bog deposit, flood-plain alluvium, terrace deposit, glacial gravel, and wind-blown silt.GBH004H3107IBethelJUnconsolidatedK100N1000BTidal flat depositsCQuaternary, HoloceneDRUndifferentiated fluvial and marine gravel, sand, silt, and mud; organic materialsGBI001H2I Baird InletJUnconsolidatedK103N1030BTidal flat depositsCQuaternary, HoloceneDRUndifferentiated fluvial and marine gravel, sand, silt, and mud; organic materialsGKB001H103I Kuskokwim BayJUnconsolidatedK103N1030AQtfB Tidal flatsCQuaternary, HoloceneGNG001H103I Nushagak BayJUnconsolidatedK103N1030BTidal flat depositsCQuaternary, HoloceneDRUndifferentiated fluvial and marine gravel, sand, silt, and mud; organic materialsGHG001H603IHagemeister IslandJUnconsolidatedK103N1030BTidal flat depositsCQuaternary, HoloceneDRUndifferentiated fluvial and marine gravel, sand, silt, and mud; organic materialsGGO001H703I Goodnews BayJUnconsolidatedK103N1030AQaBAlluvial depositsCHoloceneDFlood-plain alluvium (sand, gravel, and boulders), beach (sand and small pebbles) and estuarine deposits (clay rich silt), and dunes (fine-grained sand).GGO002H105I Goodnews BayJUnconsolidatedK105N1050AQaBAlluvial depositsCHoloceneDFlood-plain alluvium (sand, gravel, and boulders), beach (sand and small pebbles) and estuarine deposits (clay rich silt), and dunes (fine-grained sand).GHG002H105IHagemeister IslandJUnconsolidatedK105N1050AQalBAlluvial depositsCHoloceneDFlood-plain alluvium (sand, gravel, and boulders), beach (sand and small pebbles) and estuarine deposits (clay rich silt), and dunes (fine-grained sand).GNG002H105I Nushagak BayJUnconsolidatedK105N1050AQfBFlood plain alluviumC QuaternaryD&Alluvium, includes some beach depositsGHG005H605IHagemeister IslandJUnconsolidatedK105N1050AQfBFlood plain alluviumC QuaternaryD&Alluvium, includes some beach depositsYGGO008H705I Goodnews BayJUnconsolidatedK105N1050AQaBAlluvial depositsCHoloceneDFlood-plain alluvium (sand, gravel, and boulders), beach (sand and small pebbles) and estuarine deposits (clay rich silt), and dunes (fine-grained sand).GNG007H705I Nushagak BayJUnconsolidatedK105N1050AQfBFlood-plain alluviumC QuaternaryDYMud, silt, sand, gravel, boulders, and intermixed wood, peat, and other vegetal material.GBH004H3105IBethelJUnconsolidatedK105N1050AQalBAlluvial depositsC QuaternaryDAlluvial ssand, gravel, and silt along major streams and rivers. Deposits are locally transitional to undivided surficial deposits, estuarine and tidal flats deposits. Locally older alluvium may constitute the material of marine terracesGKB003H3105I Kuskokwim BayJUnconsolidatedK105N1050AQalBAlluvial depositsC Quaternary  the^W_WfWgWhWpWwWxWyW|WLWPWQWpWrWwW}W~WWWWW W5W6W7WTWUWVWmWnWoWvW{WWWWWWWWWWWWthereforemWnWoWthermalBWCWDWWWWthermally4WtheseWWtheyUWVWthickWWXWYWWWW W)W*W6W8W9WBWCWDWRWTWUWVW]W^W_W`WkWlWmWnWoWpWvW{WWWWWWWWWWhick-bedded"W#W$W:WthicknessUWVWthin WWW W"W#W:Wthintothick-beddedgreentuffaceoussandstonesiltstonear:Vthin-bedded"W&W(W;W<WQWRWTWUWVWXWthin-beddedfine-grainedquartzosesandstoneandslatewith"Vthin-beddedgreentobrownargillitewithoccasional1to4-RVthinly4Wthinlyinterbeddedfine-grainedgraywackeandsiliceousargi4VthirdaWbWcWdWeWfWgWhWGDAlluvial ssand, gravel, and silt along major streams and rivers. Deposits are locally transitional to undivided surficial deposits, estuarine and tidal flats deposits. Locally older alluvium may constitute the material of marine terracesGBI003H3105I Baird InletJUnconsolidatedK105N1050 AQrsBReworked silt depositsC QuaternaryD"Silt, sandy silt, and bog depositsGGO008H710I Goodnews BayJUnconsolidatedK113N1130!AQrsB Reworked siltC QuaternaryAChiefly reworked silt, sandy silt, and bog deposits underlying a plain transitional with or slightly above areas of flood-plain alluvium of Recent age and separated from higher plains and residual 'islands' of older silt deposits by an erosional scrap 10 to 50 feet high.GBH004H3110IBethelJUnconsolidatedK113N1130"AQrsB Reworked siltC Quaternarysilt`WaWbWcWsWtWuWvWsiltdepositssVtVuVvVsiltstone&WWWWWWWWWslateYWWslatecreekplutonYVsomeKWstpWGWIWJWKWLWUWVWsW~WstocksWsubdividedpW{WsummitWWWWW W WJWKWLWNWandFWholoceneFWRWSWTWUWVWholoceneandpleistoceneFVpleistoceneFWquaternary RWSWTWUWVW !"#$%&'()*+,-./quaternaryholoceneRVSVTVUVVV10aWbWcW50aWbWcWaaWbWcWmWnWaboveaWbWcWaddedcWadjacentbWadjoiningcWageaWbWcWalluvialBWFW^W_WfWgWhWlWmWnWoWalluvialssandgravelandsiltalongmajorstreamsandriver^V_ValluviumMWOWPWQWWWXWYWZW[W\W^W_WaWbWcWalluviumincludessomebeachdepositsZV[Valong^W_WfWgWhWoWamountQWanaWbWcWandAWBWCWDWEWFWIWMWOWPWQWRWSWUWVWWWXWYW\W]W^W_W`WaWbWcWfWgWhWlWmWnWoWW7Ksiltsandysiltandbogdeposits`Vsiltstone!W%W&W'W)W*W+W,W-W.W/W1W2W3W5W:WRWTWUWVW]W^W_W`WpWvW{WWWWWWWWWWWWWWWWWslightlyaWbWcWsmallQWWWXWYW\WWvWxWzW{W|WW W WW'W,Wsmall1kmsquaremediumtocoarse-grainedintergranularto Vsmall1kmsquarequartzmonzodioriteintrusioninkkcdofk VsmallextensivelyalteredhornblendedioritestocksanddikeVsmallintrusionsofabout1kmsquarehornblende-biotitegraVsmalloutcropsandcolumnarjointedandesiteflowssubordina{VsoftFWsomeZW[WtWuWvWEWKWUWVW|WsomewhatmWnWoWsortedWsouthernrWsparseTWspeckledWsquareWW W WWWssand^W_WstpWsteeply|Wstipple{W}Wstock}Wstock-likexWstocksWWstreamMWOWPWWW Wstream-floodWW WierosionalaWbWcWerosionallyWWWYWerosionallyneutralmedium-grainedhypidiomorphic-granumafiYVeruptionsWespeciallymWnWestimateWestimatedWWestuarineWWXWYW\W^W_WlWmWnWeuhedralWWeventWWWevents@WAWDWevidenceWWexcept6WaWbWcWdWeWfWgWhWiWjWWWexposedWW WJWWWWWexposuresWextensionbWjWWextensivelyWWWWextrapolationtWuWextrusiverWfkWlWf1WWf2WWfabric2W3WmWnWoWWWWWWWWWWWWfabricsWWfacies}W,WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWrWsWtWuWxWyWzWWWWWWWWWWWWolumnarjointedtholeiiteandalkalPVQVfinemediumandcoarse-grainedlighttodark-grayrarelypinVVV VVV"APDerived by extension from adjacent Goodnews Bay quadrangle map. Chiefly reworked silt, sandy silt, and bog deposits underlying a plain transitional with or slightly above areas of flood-plain alluvium of Recent age and separated from higher plains and residual 'islands' of older silt deposits by an erosional scrap 10 to 50 feet high.PGKB003H3113I Kuskokwim BayJUnconsolidatedK113MQN1130#AQrsB Reworked siltC QuaternaryAEChiefly reworked silt, sandy silt, and bog deposits underlying a plain transitional with or slightly above areas of flood-plain alluvium of Recent age and separated from higher plains and residual 'islands' of older silt deposits by an erosional scrap 10 to 50 feet high. Polygons added to match adjoining Bethel quadrangle.EGBI003H3113I Baird InletJUnconsolidatedK113N1130$AQbBBeach depositsC QuaternaryGNG002H114I Nushagak BayJUnconsolidatedK115N1150%AQbBBeach depositsC QuaternaryGNG007H702I Nushagak BayJUnconsolidated 1scrapaWbWcWscreensWWseWW WseaFWseacoastkWlWseamsWWWWW WWsecondaryWWsectionWW WaWbWcWdWeWfWgWhWiWjWkWlWWWWsections#W$WmWnWoWxWyWsecurityWWWWsediemtsLWsedimentaryWWWWW W!W0W1W5W8W9WTWUWVW]W^W_W`WmWnWoWpWqWvW{WWWWWWWWWWWWWWWWWchdepositspoorlybeddedsoftpeFVsensemWnWoWseparatedaWbWcWsequenceWWW!W#WXW[WkWlWmWnWoWsequences$WseriateWWPWserpentine~WOWserpentiniteNWserpentinite-matrixNWseveralWWW Wseverely=W>Wsf1mWnWoWsf2mWnWoWshaleWWWWW W!W$W%W&W)W*W+W2W3W6WKW[W\Wu alt>hfs4M`quq"4/‚Ä! Ä!AÄ!aÄ"A !"#Ä"a$%&'(Ä"q)*+Ä",-./Ä"0Ä#12Ä#!3456Ä#a789:;<=>?Ä$a@Ä%ABCDEÄ91FÄBGHIJÄBKLMÄCNOÄDPQTXYZÄDRSÄF[\ÄF]^ÄVUVW_`ÄWqabcde@%K115N1150&AQbBOlder beach depositsC QuaternaryAOlder raised beach ridges on mainland along Kuskokwim Bay. Derived from interpretation of topographic maps and Google Earth image. Deposits are locally transitional to undivided surficial deposits, alluvial deposits, and locally may constitute the material of marine terracesGKB003H3115I Kuskokwim BayJUnconsolidatedK115N1150'AQbBOlder beach depositsC QuaternaryAOlder raised beach ridges on mainland along Kuskokwim Bay. Derived from interpretation of topographic maps and Google Earth image. Deposits are locally transitional to undivided surficial deposits, alluvial deposits, and locally may constitute the material of marine terracesGBI003H3115I Baird InletJUnconsolidatedK115N1150(AQbBOlder beach depositsC Quaternary9raisedfWgWhWmWnWoWraisedsurfaceunderlainbyavarityofunconsolidateddeposmVnVrandomlyWWrangeUWVWTWUWVWaWbWcWdWeWfWgWhWiWjWvW{WWWWWrangingWWW WWWWWWrarepW6WaWbWcWdWeWfWgWhWiWjWWWWWWWWWWrarelyWWW WWWWre-assigned)Wreassigned2WrecentaWbWcWrecessiveWreconstructedaWbWcWdWeWfWgWhWiWjWrecordedWWrecordsWWrecrystalizedWrecrystallizationWrecrystallizedWWWWWWWWWWWWWWWredWWWWWWWWtedWrelationshipWrelativelyWrelativelyhomogeneousunitoffinelyfoliatedandcrenulateVrelictWreliefvWreplacedaWbWcWdWeWfWgWhWiWjWWWWWWW5MloccallyMWlongeraWbWcWdWeWfWgWhWiWjWloosepWlowJWrWWWWWWlow-angleWWWWWlow-lyingXWYWlowerXWYWWW W6WkWlWrWWWWWWWWWWlowestaWbWcWdWeWfWgWhWiWjWAWmay^W_WfWgWhWtWuWvWmedium-grainedPWQWmekoryukRWSWmemberstWuWvWmicrocrystsXWYWminorXWYWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWmostpW@WAWDWmostprobablyassociatedwithlatewisconsineventsAVDVmostlyBWpWmovespWmudCWDWEWIWRWSWUWVW]Wmudsiltsandgravelbouldersandintermixedwoodpeatando]VmudrockFWnoLWnonmarinetWuWvWnonporphyriticXWYWnormallyNWOWRWSWnorthpWnotAWJWKWLWofQW^W_WaWbWcWfWgWhWmWnWoWpWtWuWvWW@WKWLWNWOWPWQWRWSWWWXWYW(AOlder raised beach ridges on mainland along Kuskokwim Bay. Derived from interpretation of topographic maps and Google Earth image. Deposits are locally transitional to undivided surficial deposits, alluvial deposits, and locally may constitute the material of marine terracesGNI004H4115INunivak IslandJUnconsolidatedK115N1150)AQesBRaised estuarine depositsC QuaternaryGNG002H116I Nushagak BayJUnconsolidatedK116N1160*AQesBRaised estuarine depositsC QuaternaryGNG007H704I Nushagak BayJUnconsolidatedK116N1160+AQesBRaised estuarine depositsC QuaternaryGGO006H6116I Goodnews BayJUnconsolidatedK116N1160,AQmtBRaised estuarine depositsC QuaternaryD2Underlain be older estuarine and alluvial depositsGNG007H706I Nushagak BayJUnconsolidatedK117N1170-AQmtBMarine terraceC QuaternaryDRaised surface underlain by a varity of unconsolidated deposits, especially including older beach, estuarine, alluvial, and probably glacial depositsGKB003H3117derivedbyextensionfromadjacentgoodnewsbayquadranglembVdescribedJWKWLWuWWWWdescriptionjWdeterminationWWdeterminationsWWW WBWCWDWdetritusWWWWW WaWbWcWdWeWfWgWhWiWjWmWnWoWWWdevelopedIWWWWdevelopmentWWWWWWWdevitrifiedsWtWuWdevonianWdiabaseWWW?W@WWWWWWWWdiabasicWWWWWWdiallageWdiametervWHWWdikesWWdikesjWkWlWmWnWoWxWWWWWWWWWBWCWDWLWMWWWWWWWWWWWelongatenorth-trendingerosionallyresistantmafictointerVelsewhereqWendzW{W}Wenhanced@WeolianCWDWEWFWIWtWuWvWepochNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWequivalentrWerodedoWerosion~WV  Ã"p)*+Ã",-./Ã"0Ã#12Ã# 3456Ã#`789:;<=>?Ã$`@Ã%ABCDEÃ90FÃBGHIJÃBKLMÃCNOÃDPQRSTXYZÃF[\]^ÃVUVW_`ÃWpabcdeÄ!4fÄ!5ghiÄ!djklmnoÄ"!pÄ""qÄ"1rÄ$sÄ'tuvwxÄ'yÄ'z{|Ä'6}Ä'Q~Ä'fÄ'gÄ'h Ä'i Ä'qÄ'vÄ'Ä*q Ä*!"#$%&'Ä*)*+,Ä12-./0Ä2123Ä24Ä2656Ä2a7Ä289:тÄ3!=>Ä3q?@ABCDEFGÄ3rHIJKÄ3vLMÄ6!NOÄ6APÄ9ACRÄ9SÄ9TUVÄ9WÄ9XÄ:YÄAQZÄB1[ÄBA\ÄBa]^_`ÄBbabcdefghijÄBcklÄCAmnopÄCeqrÄCfstuvÄCqwÄD!xyz{ÄD|ÄE}~ÄEaÄEbÄEÄF!ÄIÄIÄIÄIÃ`Ãp,Ãà 2Ã03Ã`=ÃCDÃÃ`>ÃÄ"!pÄ""qÄ$4Ä$MÄ$1Ä$aÄ&3uÄ&GÄ&aÄ'tÄ'uÄ'zÄ'vÄ'yÄ'{Ä'wÄ'fÄ'g Ä'qÄ'vÄ'wÄ'xÄ*"Ä**Ä*#Ä*$Ä*%Ä*&Ä*+Ä2'3Ä2:Ä3!=Ä3v>Ä3HÄ3EÄ3IÄ3JÄ3FÄ3KÄ3GÄ5q Ä5r Ä5Ä6!NÄ6APÄ9!RÄ9SÄ9WÄ9XÄ:YWOWSW\WaWcWeWhWcapemendenhallHVOVSV\VaVcVeVhVgoodnewsJWOWPWVWWW[W`WkWsWwW}W~WCWPWXWjWmWgoodnewsbayJVOVPVVVWV[V`VkVsVwV}V~VCVPVXVjVmVhagemeisterKWMWUWXWZWxW{WBWFWQWYWkWnWhagemeisterislandKVMVUVXVZVxV{VBVFVQVYVkVnVinletCWRW_WcWgWnWuW_WislandDWGWKWMWUWXWZWhWoWxW{WBWFWNWQWRWYW[W]W^W`WbWdWfWgWiWkWnWislandspWGWHWIWJWKWLWMWUWVWWWsW-I Kuskokwim BayJUnconsolidatedK117N1170.AQmtBMarine terraceC QuaternaryDRaised surface underlain by a varity of unconsolidated deposits, especially including older beach, estuarine, alluvial, and probably glacial depositsGBI003H3117I Baird InletJUnconsolidatedK117N1170/AQbBOlder beach depositsC QuaternaryAOlder raised beach ridges eroded to constitute raised marine terraces on mainland along Kuskokwim Bay. Derived from interpretation of topographic maps and Google Earth image. Deposits are locally transitional to undivided surficial deposits, alluvial deposits, and beach depositsGNI004H4117INunivak IslandJUnconsolidatedK117N11700B5Late alluvial sediments, mostly sand, St. Paul IslandC QuaternaryDLate alluvial sediments, mostly sand. In most places, the sand is loose and moves with the wind. Along the north shore of St. Paul Island, impressive dunes are formedGPI002H120IPribilof IslandsJUnconsolidatedK119N11901AQdBEolian deposits[are^W_WfWgWhWoWpWtWuWvW@WLWUWVWmWnWoW|WWBWCWDWIWTWUWVWsWtWuWvW{WWWWWWWWWWareaqWrWwWWW6WkWlWWWWW'surficialBWCWDWEWIWJWKWLWNWsurficialdepositsBVCVDVEVIVsurficialdepositsundividedJVKVLVNVswifttWuWzWHWswiftcreekvolcanicfieldandesiteflowszVswiftcreekvolcanicfieldlithicair-falltuffHVswiftcreekvolcanicfieldrhyoliteuVswiftcreekvolcanicfieldrhyoliteash-flowtufftVterracemWnWterrane2W3W:WRWSWXWZW\WwWWWWWWWWWWWWWWWWterrnae[WtertiarymWnWoWtertiaryrhyolitemVnVoVWNWvalleyPWQWvolcanic_W`WaWandFWwWxWyW|WNWOWRWSW[W\W]W^WbWcWdWeWearlyZWholoceneFWRWSWTWUWVW12wWxWyW|WNWOWRWSW[W\W]W^WbWcWdWeWholoceneandpleistoceneFVwVxVyV|VlateZWorFWZWpleistoceneFWwWxWyW:|WFWNWOWPQRWSWTZW[W\W]W^WbWcWdWeWpleistoceneandholoceneNVOVRVSV[V\V]V^VbVcVdVeVp6 kuskokwimEWIWSW^WbWfWmWtWkuskokwimbayEVIVSV^VbVfVmVtVmatthewAWBWrWWW4WAWLWMWmendenhallHWOWSW\WaWcWeWhWnunivakDWGWhWoWNWRW[W]W^W`WbWdWfWgWiW.W/W0WnunivakislandDVGVhVoVNVRV[V]V^V`VbVdVfVgViV.V/V0VnushagakLWNWTWYW\WdWeWiWjWlWqWrWyW|W@WAWDWlWoWWWW W@WDW_W`WcWdWeWfWgWhWiWoWnushagakbayLVNVTVYV\VdVeViVjVlVqVrVyV|V@VAVDVlVoVVVV V@VDV_V`VcVdVeVfVgVhViVoVpribilofpWGWHWIWJWKWLWMWUWVWWWsW~WpribilofislandspVGVHVIVJVKVLVMVUVVVWVsV~VsaintAWBWrWWW4WAWLWMWabcdefghijklmnopqrstuvwxyz{|}~ =>?@BCDEFGHIJKL"p1CHoloceneDDunes (fine-grained sand).GNG002H110I Nushagak BayJUnconsolidatedK120N12002AQdBEolian depositsCHoloceneDDunes (fine-grained sand).GNG007H710I Nushagak BayJUnconsolidatedK120N12003AQsB Silt depositsC QuaternaryD'Light- to dark-gray silt and sandy siltGGO008H722I Goodnews BayJUnconsolidatedK121N12104AQsdB Silt depositsC QuaternaryA]Inferred by extrapolation from adjacent Bethel and Goodnews Bay quadrangles. Chiefly light- to dark-gray silt and sandy silt containing abundant permafrost. Deposits become sandier with depth and locally contain pebbles and wood fragments. Deposits are probably of nonmarine fluvial origin but may include eolian and marine members in some areas.]EcOrganic muck containing mammoth remains and nonmarine gastropods occur locally near top of depositsGKB003H3121I Kuskokwim BayJUnconsolidatedK121MQN12105AQsdB Silt depositsC QuaternaryfadjoiningcWadvanceswWxWyW|WaeoluskWlWaffinitiesWaffinityBWCWDWWafterBWCWDWrWWWWcW|WWWW WkWlWmWnWoWsWtWuWxWyWzWWWWWages@WBWCWDWWWWWWWaggregateWahzwiryukfWair-fallHWIWalbitexWWalkaliXWYWalkali-olivinePWQWalkalicNWOWUWVWWWbWcWdWeWfWalkalicbasaltofahzwiryukbluffnubblymottledflowsandpfValkalicbasaltofkaronlakecinderconesflowsandtephranNVOVdVeValkalicbasaltofkaronlakecinderconesflowsandtephrarbVcVall@WalluvialBWFW^W_WfWgWhWlWmWnWoWpWWW Walluvialssandgravelandsiltalongmajorstreamsandriver^V_ValluviumMWOWPWQWWWXWYWZW[W\W^W_WaWbWcWwWxWyW|WWalluviumincludessomebeachdepositsZV[ValmostBWCWDWaWbWcWdWeWfWgWhWiWjWWWw2gastropodstWuWvWLWghostsWWgivenWWgoodnewsWWhauterivian5W6WhavemWnWoWxWyWzWhoarekWlWidentifiedmWnWoWxWyWzWin&W5WXWaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWWWjcXWklb16Wklb1preservesabundantvalanginianfaunaklb2yieldsrareh6Vklb26WlateWWWWW W"W#W%W&W'W(W)W*W,W2W3W;W<WQWRWTWUWVW[W]W^W_W`WlatejurassicandorearlycretaceousagefrompoorlypreserRVlocalities(W;W<WQWlocallytWuWvWlow&WmaestrichtianWW WmammothtWuWvWmap!WkWmarineFW[Wmarinepelecypodsofbajocianagemiddlejurassicmarinepel[Vmegafossil"W#W%W&W)W*Wmiddle'W,W[W]W^W_W`WkWmucktWuWvWneartWuWvWnondiagnostic$WnonmarinetWuWvWnorth!Wnortheast5A]Inferred by extrapolation from adjacent Bethel and Goodnews Bay quadrangles. Chiefly light- to dark-gray silt and sandy silt containing abundant permafrost. Deposits become sandier with depth and locally contain pebbles and wood fragments. Deposits are probably of nonmarine fluvial origin but may include eolian and marine members in some areas.]EcOrganic muck containing mammoth remains and nonmarine gastropods occur locally near top of depositsGBI003H3121I Baird InletJUnconsolidatedK121N12106AQsB Silt depositsC QuaternaryAChiefly light- to dark-gray silt and sandy silt containing abundant permafrost. Deposits become sandier with depth and locally contain pebbles and wood fragments. Deposits are probably of nonmarine fluvial origin but may include eolian and marine members in some areas.EcOrganic muck containing mammoth remains and nonmarine gastropods occur locally near top of depositsGBH004H3122IBethelJUnconsolidatedK121N12107AQg+beJWKWLWlWrWWWWbeachBWWWXWYWZW[W\WfWgWhWmWnWoWFWbecometWuWvWbecomesWWbeddedFW)W*WmWnWoWrWWWWWWWbeddingIWaWbWcWdWeWfWgWhWiWjWWWWWbedding-planemWnWoWbedrockJWKWLWbedsHWmWnWoWWWWbeenLWmWnWoWbeforesWbeginningWW WbelievedWWWbelowmWnWoWWbeltWWWWbethelcWtWuWWWWbiotitemWnWoWWWWWW WWWsWtWuWWWWbiotite-augite Wbiotite-bearingWWbiotite-hornblendeWWW W WPWWbirdWWblackXWYWZWtW|WWW W&W6WEWJWKWOWwWxWyWblackdenselyweldedandesitetuffexposedinlowhillsandJVblockwWmWnWoWblockswWmWnWoWWWWWWblocky1WWWHother]WmWnWoWWWWWWothers)W2WBWCWDW]W^W_W`WpWWoutyWWoutcrops{WouteraWbWcWdWeWfWgWhWiWjWoutwashFWWBWCWoutwash-fanEWoverWWWWoverlainWWWWoverlieLWzWoverliesqWBWCWDWWWWWoverlyingLWsWWWWWWWWWWoxfordianaWbWcWdWeWfWgWhWiWjWoxidesTWWpWWpalevWpalepinktoorangerhyolitedomesfoundassmallknobsorlvVpale-greenOWWpale-pinkPWpaleocurrent6WpaleocurrentsWW WkWlWpaleoslopeaWbWcWdWeWfWgWhWiWjWpaleozoicWWpartrWWkWlWWWWWWWWWWWWWWWpartiallytocompletelyrecrystallizedcalcareousphyllitesVVpartiallytocompletelyrecrystallizedschistoserockswithV7BGlacial DepositsCHolocene and PleistoceneDGlacial drift deposited during the last three glacial advances. Sand, gravel, and boulders. Includes moraines. Also includes colluvium, talus, landslide debris, alluvium, and local silt.GGO002H106I Goodnews BayJUnconsolidatedK125N12508AQgBGlacial DepositsCHolocene and PleistoceneDGlacial drift deposited during the last three glacial advances. Sand, gravel, and boulders. Includes moraines. Also includes colluvium, talus, landslide debris, alluvium, and local silt.GHG002H106IHagemeister IslandJUnconsolidatedK125N12509AQgBGlacial DepositsCHolocene and PleistoceneDGlacial drift deposited during the last three glacial advances. Sand, gravel, and boulders. Includes moraines. Also includes colluvium, tallus, landslide debris, alluvium, and local silt.GNG002H106I Nushagak BayJUnconsolidatedK125N1250:AQtB Glacial tillC PleistoceneDAQdB Glacial driftC QuaternaryD6Poorly to well-sorted silt, sand, gravel, and bouldersGGO006H825I Goodnews BayJUnconsolidatedK125N1250?AQdB Glacial driftC Quaternary?DChiefly unsorted and poorly sorted sand, gravel, and boulders comprising various types of ice-contact and glaciofluviatile deposits; small areas of glacial outwash, colluvium, and alluvium included with unit.GBH004H3135IBethelJUnconsolidatedK125N1250@AQmBMorainal ridgesC QuaternaryDMorainal ridges of all ages; however most are probably associated with Late Wisconsin events. Topographic map interpretation enhanced by data from Warren CoonradGNG007H700I Nushagak BayJUnconsolidatedK135N1350AAQoBOutwash depositsC QuaternaryD3Most probably associated with Late Wisconsin eventsGNG002H140I Nushagak BayJUnconsolidatedK140N1400BAQoBOutwash depositsC QuaternaryDSPoorly to well-sorted silt, gravel, and boulders in terraces and outwash fan-plainsGHG005H640IHagemeister IslandJUnconsolidatedK140N1400CAQoBOutwash depositsC QuaternaryDSPoorly to well-sorted silt, gravel, and boulders in terraces and outwash fan-plainsGGO008H740I Goodnews BayJUnconsolidatedK140#chieflyunsortedandpoorlysortedsandgravelandbouldersVchikuminukWWchlorite|WWWWWWWWWWWcinderNWOW_W`WaWbWcWdWeWclarkWWclassWWWWWclastWWclasticWW W6WWWWWWclasticsWWclastsKW%WHWaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWsWtWuWWWWWWWWclayWWXWYW\WcleavageaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWxWyWzWWWWWWWWWcleavedWWcliffsFWyWclinopyroxeneTWBWCWDWrW}W~WWWWWWclinopyroxeniteWWWWclinozoisiteWWWcmUWVWHWWcoalWWWWW W'W,W-W.W/WWWconsistsLWmWnWoWconstitute^W_WfWgWhWoWconstitutingEWcontactLW WWWispWLW~W WWIWPWaWbWcWdWeWfWgWhWiWjWkWlWxWyWzWWWWWWWWWWWWWWislandpW~WWWWBWCWDWWislandsAWaWbWcWisoclinalWWisolatedXWYWitWWWWWitsmWnWoWWWjlnmWnWoWWW W6WjlvWW WWjlvsuWjmgWWWWWjmmWW W6WmWnWoWjmuWWjmvWW WjointedPWQWXWYW{WjpbxWyWjpvssWWjtrmbWWWWWjtrmcWWjtrmvssWWWWWWWWjWjustWWk-arWWW WBWCWDWkWlWWWWWWWWWkaronNWOWbWcWdWeWkb7WkilometerWW WkinkedWkjc WXWkkcd WWWkkmfWkkshWkkv WWklb16WaWbWcWdWeWfWgWhWiWjWCN1400DAQoBOutwash depositsC QuaternaryD3Most probably associated with Late Wisconsin eventsGNG007H740I Nushagak BayJUnconsolidatedK140N1400EAQoBOutwash depositsC QuaternaryDvPoorly to well-sorted sand and gravel with some silt and a few boulders, constituting terraces and outwash-fan plains.GBH004H3140IBethelJUnconsolidatedK140N1400FAQTsB&Semiconsolidated marine beach depositsCPleistocene or PlioceneDmSemiconsolidated marine beach deposits. Poorly bedded, soft, pebbly siltstones cap volcanic rock sea cliffs.E.shallow marine fossils of Plio-Pleistocene ageGHG002H112IHagemeister IslandJ SedimentaryK282N2820GB%Pyroclastic deposits, St. Paul IslandC QuaternaryD+Pyroclastic deposits, largely basaltic tuffGPI002H310IPribilof IslandsJIgneousK310N3100HB"Pyroclastic deposits, Otter IslandC QuaternaryDPyroclastic depositsGPI002H311IPribilof IslandsJIgneousK310N3100IBTuff, St. George IslandC QuaternaryDTuffGPI002H312IPribilof IslandsJIgneousK310semiconsolidatedmarinebeachdepositsFVsequence-W.W/WserpentineOserpentiniteNserpentinizedWWserpentinizedultramaficrocksVVshale&W:W[WWsilicicLWMWX>plainZW[WpleistoceneKWpleistocenesedimentssomefossiliferousstpaulislandKVplummerWplutonW W WWWWWWYWWWplutonicWplutonsWWWW WPWWWWWporphyry{Wprovenance"W#W$W%W)W*WpyroclasticGWHWJWLWMWpyroclasticdepositsotterislandHVpyroclasticdepositsstgeorgeislandJVpyroclasticdepositsstpaulislandGVpyroxeneWquartz Wquartzmonzoniteofkipchukriver VquaternaryXWYWquaternarybasalttogiakbasaltofhoareandcoonrad1980XVYVraisediWjWkWlWraisedestuarinedepositsiVjVkVlVregionWrelatedWreworked`WaWbWcWreworkedsiltaVbVcVreworkedsiltdeposits`VrhyolitemWnWoWpWrWtWuWvWxW=W>Wrocks_W`WaWjWkWlW|W}WWWWWW WWWWWWWWWWWW W"W#W$W%W'W)W*W,W0W8WIN3100JB'Pyroclastic deposits, St. George IslandC QuaternaryD+Pyroclastic deposits, largely basaltic tuffGPI002H313IPribilof IslandsJIgneousK310N3100KB:Pleistocene sediments, some fossiliferous, St. Paul IslandC QuaternaryDPleistocene sediments, some fossiliferous. Polymictic, but composed primarily of basaltic boulders and clasts. Locally cross-beddedGPI002H291IPribilof IslandsJUnconsolidatedK317N3170LB*Fossiliferous sediments, St. George IslandC QuaternaryAFossiliferous sediments consisting of sand and yellow tuff containing rounded basalt pebbles. Sediemts overlie a glaciated surface of the peridotite upon which Pleistocene fossil shells have been cemented. The sediments are quite varied; however, a basal conglomerate has boulders of peridotite but primarly consists of basalt boulders. Overlying the basal conglomerate is a sand layer containing casts of fossil shells; however no CaCO3 is left and the casts disintegrate on contact.older^W_WaWbWcWfWgWhWlWmWnWoWfWiW|WWW WolderraisedbeachridgeserodedtoconstituteraisedmarineoVolderraisedbeachridgesonmainlandalongkuskokwimbaydefVgVhVolivineTWUWVWXWYWZW|WBWCWDWEWFWonAWJWKWLWfWgWhWoWLWPWQW|WWWW WWW WBWCWDWaWbWcWdWeWfWgWhWiWjWkWlWWWWWWWWWWWWWWWWWWshflowmappedinareabrokenblocksofdacitwVonlymWnWoWsWtWuWWWopaqueKWophioliteWoraWbWcWUWVWZWvWWWW W=WsWtWuWxWyWzWWWWWWWorangevW>WorderWW WorganicCWDWEWIWRWSWUWVWorientedWWorigintWuWvWWW W6WBWCWDWoriginalW WWWmWnWoWoriginally~WorthoclasemWnWoWorthopyroxeneBWCWDWLE,Pelecypods and gastropods of Pleistocene ageGPI002H292IPribilof IslandsJUnconsolidatedK317N3170MB"Sedimentary deposits, Otter IslandC QuaternaryD SedimentsGPI002H293IPribilof IslandsJIgneousK317N3170NAQkn1BAlkalic basalt of Karon LakeCPleistocene and HoloceneDqAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; normally polarized rocks of Brunhes polarity epochGNI003H120INunivak IslandJIgneousK320N3200OAQkn1BAlkalic basalt of Karon LakeCPleistocene and HoloceneDqAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; normally polarized rocks of Brunhes polarity epochGCM003H120ICape MendenhallJIgneousK320N3200PAQtbBBasalt of Togiak River ValleyC PleistoceneDFine- and medium-grained, columnar jointed tholeiite and alkali-olivine basalt flows on the floor of the broad Togiak River Valley.FK/Ar age of 0.758 +/- 0.2 m.y.GGO002H110I Goodnews BayJIgneousK330N3300QAQtbBBasalt of Togiak River ValleyC Pleistocene~QDFine- and medium-grained, columnar jointed tholeiite and alkali-olivine basaltflows on the floor of the broad Togiak River Valley.FK/Ar age of 0.758 +/- 0.2 m.y.GHG002H110IHagemeister IslandJIgneousK330N3300RAQmn1BTholeiitic basalt of MekoryukCPleistocene and HoloceneDrTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; normally polarized rocks of Brunhes polarity epochGNI003H130INunivak IslandJIgneousK330N3301SAQmn1BTholeiitic basalt of MekoryukCPleistocene and HoloceneDrTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; normally polarized rocks of Brunhes polarity epochGCM003H130ICape MendenhallJIgneousK330N3301TAQbBBasaltC PleistoceneDUnaltered olivine tholeiite basalt flows having diktytaxitic texture. Contains olivine, subophitic clinopyroxene, plagioclase and iron oxides with sparse interstitial volcanic glass.F%Whole rock K/Ar age of 0.418+0.016 MaGBH002H300IBethelJIgneousK330N3300UBBasaltic flows, St. Paul IslandolderfWgWhWoWolderbeachdepositsfVgVhVoVoreWorthogneissWothersWW WotterHWMWWWoutereWouter-fan"W#WoutwashAWBWCWDWEWoutwashdepositsAVBVCVDVEVpaleozoicWWWpaulpWGWKWUWpelititcWperidotite~Wperidotitestgeorgeisland~VpermianWWWWWWpermianlimestoneVVpermianpillowbasaltVVpermianvolcaniclasticrocksVVpermian-jurassicWWpermian-jurassicvolcaniclasticsandstoneandconglomerateVVphyllite2W3WwWWphylliticWpillowXWWWWWWSpleistoceneorplioceneFVplioceneFWZWfWgWhWiWprecambrian̂͂proterozoicWquaternary RWSWTWUWVW !"#$%&'()*+,-./03456;=>?@ABCDEGHIJKLMUVWXYZWs~quaternaryholoceneRVSVTVUVVVquaternaryortertiaryearlypleistoceneorlateplioceneZVquaternary/tertiary_`atertiaryZWfWgWhWiWjklmnopWqWrtWuWwWxyWzW|W}WWWWW W WWWWWWWW?W@WAWOWWYWWWW1978aXWYWWW1980XWYW20UWVW300XWYWvW325WW4vW50aWbWcW500vW7UWVWaaWbWcWmWnWEWLWXWYWwW|W}W~WWWWaboutXWYWWaboveaWbWcWabundanttWuWvWmWnWoWabundantsillsanddikescuttingkusandjlninvicinityofmVnVoVaccessoryXWYWmWnWoWWWacrossWWaddedcWadjacentbWtWuW~TXAQbBWwhole-rockBWCWDWwindpWwind-blownQWwindblownMWOWPWwisconsin@WAWDWwithaWbWcWpWtWuWvWW@WAWDWEWTWXWYWvW}WWWWW W WWWW W"W#W$W'W,W2W3W7WBWCWDWGWHWIWRWTWUWVWXW[W]W^W_W`WkWwood]WtWuWvWykWyellowLWyieldBWCWDW[DtTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; reversely polarized rocks of Matuyama polarity epochGNI003H131INunivak IslandJIgneousK350N3502\AQmr1BTholeiitic basalt of MekoryukCPleistocene and HoloceneDtTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; reversely polarized rocks of Matuyama polarity epochGCM003H131ICape MendenhallJIgneousK350N3502]AQmn2BTholeiitic basalt of MekoryukCPleistocene and HoloceneDsTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; normally polarized rocks of Matuyama polarity epochGNI003H132INunivak IslandJIgneousK350N3503^AQmn3BTholeiitic basalt of MekoryukCPleistocene and HoloceneDsTholeiitic basalt of Mekoryuk; massive, columnar-jointed flows; normally polarized rocks of Matuyama polarity epochGNI003H133INunivak IslandJIgneousK350N3503_AQTvBMafic volcanic rocksCQuaternary/TertiaryD#Basalt lava flows and cinder cones.GBI002H5I Baird InletJIgneousK450N4500`AQTvof\W]W^WbWcWdWeWfWgWhWiWmWnWoWpWrWsWwW|W}W~WWWWWWWW W W W WWWWWWWWWWWWW W!W%W'W,W-W.W/W1W5W6W7W8W9WAWBWCWDWEWKWNWOWTWUWVWXW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWoffshore6WoftenmWnWoWaWbWcWdWeWfWgWhWiWjWsWtWuWxWyWzWWWWWW@matchcW)W2Wmaterial]W^W_WfWgWhWmaterialsCWDWEWIWRWSWUWVWmatogakWWmatrixZWwWWmWnWoWmatthewAWmatuyama[W\W]W^WbWcWdWeWmay^W_WfWgWhWtWuWvWrWmeanderingWW WmechanismsmWnWoWmediumWWW W WWWWWWkWlW}W~WWWWWWWmediumtocoarse-grainederosionallyresistanthypidiomorphiVmediumtocoarse-grainedlocallypegmatitichornblendegabbrVVmediumtocoarse-grainedlocallypegmatiticintrusivegabbro}V~Vmediumtocoarse-grainedpyroxenegabbrodikeVmedium-grainedPWQWWWW W W"W#W+W?W@WIWYWqW|WWWWWWWmedium-grainedbiotite-hornblendegranodioriteofhagemeisteVmedium-grainedgraniticplutonicrocksrangingfromquartzmVVV VeWfWgWhWiWnorthpW@WKWLWNWOWPWQWRWSWWWXWYW[Wvmorainal@Wmorainalridges@VmostlypWmountain WWWmtWmtplummerplutonVnayorurunWnonmarineWW WnorthWnorthforkplutonVnotAWnotmappedAVnuklukpWqWnuklukvolcanicfieldbasaltandandesiteqVnuklukvolcanicfieldrhyolitepVnyacPWSW[WWnyacbonanzacreekandcolumbiacreekplutonsundividedPVofNWOWPWQWRWSWXWYW[W\W]W^WbWcWdWeWfWgWhWiWW WWWWWW W5W6W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWWWW`BMafic volcanic rocksCQuaternary/TertiaryD#Basalt lava flows and cinder cones.GNI002H5INunivak IslandJIgneousK450N4500aAQTvBMafic volcanic rocksCQuaternary/TertiaryD#Basalt lava flows and cinder cones.GCM002H5ICape MendenhallJIgneousK466N4660bAQkr1BAlkalic basalt of Karon LakeCPleistocene and HoloceneDwAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; reversely polarized rocks of Matuyama (?) polarity epochGNI003H121INunivak IslandJIgneousK466N4660cAQkr1BAlkalic basalt of Karon LakeCPleistocene and HoloceneDwAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; reversely polarized rocks of Matuyama (?) polarity epochGCM003H121ICape MendenhallJIgneousK466N4660dAQkn2BAlkalic basalt of Karon LakeCPleistocene and HoloceneDvAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; normally polarized rocks of Matuyama (?) polarity epochGNI003H122INunivak IslandJIgneousK466N4660eAQkn2BAlkalic basalt of Karon Lake`polygonscWpolymicticKWpolyphaserWpoorly{W}W~WWBWCWEWFWkWlWmWnWoWWpoorlyexposedwhitelimestoneatsouthwestendoflargerbeVpoorlytowell-sortedsiltgravelandbouldersinterracesaBVCVpoorlytowell-sortedsiltsandgravelandboulders~Vpoorlytowell-sortedsiltsandgravelandbouldersstipple{V}VporphyriesWWrWsWtWuWWWWWporphyriticjWkWlWmWnWoWxW|WWWBWCWDWEWFWLWMWPWWWWWporphyriticplagioclase-pyroxeneandesiteflowsandflowbreEVporphyriticpropyliticallyalteredoneandtwo-pyroxeneandeFVporphyry{W}WWportionkWlWpossibly}WWW WWWpost-metamorphicWWWWpost-triassicmWnWoWpotassiumWpre-consolidationWWpre-metamorphicWWWWpre-valanginiansWtWuWpredominantlyWominatelymWnWoWWWWoWeCPleistocene and HoloceneDvAlkalic basalt of Karon Lake; cinder cones, flows, and tephra; normally polarized rocks of Matuyama (?) polarity epochGCM003H122ICape MendenhallJIgneousK466N4660fATaB!Alkalic basalt of Ahzwiryuk BluffCTertiary, PlioceneDAlkalic basalt of Ahzwiryuk Bluff; nubbly mottled flows and pyroclastic ejecta; includes both normally and reversely polarized rocks older than Gauss polarity epochGNI003H140INunivak IslandJIgneousK1023gATbn1B$Tholeittic basalt of Binakslit BluffCTertiary, PlioceneDwTholeittic basalt of Binakslit Bluff; massive, columnar-jointed flows; normally polarized flows of Gauss polarity epochGNI003H141INunivak IslandJIgneousK1024hATbn1B$Tholeittic basalt of Binakslit BluffCTertiary, PlioceneDwTholeittic basalt of Binakslit Bluff; massive, columnar-jointed flows; normally polarized flows of Gauss polarity epochGCM003H141ICape MendenhallJIgneousK1024iATbB$Tholeittic basalt of Binakslit BluffCTertiary, PlioceneiDTholeittic basalt of Binakslit Bluff; massive, columnar-jointed flows; includes both normally and reversely polarized flows older than Gauss polarity epochGNI003H142INunivak IslandJIgneousK1024jATifBFelsic intrusive rocksCTertiaryDwLight-colored, fine-grained, commonly porphyritic felsic intrusive rocks. Chiefly rhyolitic to dacitic dikes and sillsF)K/Ar age of 13 +/- 0.5 m.y. from biotite.GGO002H160I Goodnews BayJIgneousK1053kATifBFelsic intrusive rocksCTertiaryDwLight-colored, fine-grained, commonly porphyritic felsic intrusive rocks. Chiefly rhyolitic to dacitic dikes and sillsF)K/Ar age of 13 +/- 0.5 m.y. from biotite.GHG002H160IHagemeister IslandJIgneousK1053lATifBFelsic intrusive rocksCTertiaryDwLight-colored, fine-grained, commonly porphyritic felsic intrusive rocks. Chiefly rhyolitic to dacitic dikes and sillsF)K/Ar age of 13 +/- 0.5 m.y. from biotite.GNG002H160I Nushagak BayJIgneousK1053mATrBTertiary rhyoliteCTertiaryflatRWSWUWVWflatsTWfloodZW[WfloodplainalluviumZV[Vflood-plain]Wflood-plainalluvium]VflowwWflowsUWVWWWyWzW{W=W>WAWEWFWGWSWWforkWformationWW WeorgeIWJWLWVWsW~WglacialwWxWyWzW{W|W}W~WWglacialdepositswVxVyV|Vglacialdrift{V}V~VVglacialtillzVgraniticWWWWWWW W WgraniticrocksVVVV VgranodioritehoareXWYWhylobasaniticWWhylobasaniticflowsotterislandWVigneousWigneousrocksofnayorurunriverareaVintrusivejWkWlWislandpWGWHWIWJWKWLWMWUWVWWWsW~WkaronNWOWbWcWdWeWkipchuk WlakeNWOWbWcWdWeWWlatepWlatealluvialsedimentsmostlysandstpaulislandpVmafic_W`WaWmaficvolcanicrocks_V`VaVmappedAWmarinemWnWFWmarineterracemVnVmarvelWmekoryukRWSW[W\W]W^Wmonzonite WmA5Abundant sills and dikes cutting Kus and Jln in vicinity of Nunavarchak Lake (only largest body shown). Consists of cream-colored, often iron-stained, aphanitic to porphyritic rhyolite to dacite. Phenocrysts are quartz, plagioclase, orthoclase, and accessory biotite and pyrite. Feldspars somewhat altered. 5FYields a K-Ar biotite age of 13.0 +/- 0.5 m.y.; however, its association with feeder dikes of Upper Cretaceous volcanic rocks suggest true intrusive age may be Late Cretaceous. GGO005H502I Goodnews BayJIgneousK1053nATrBTertiary rhyoliteCTertiaryA5Abundant sills and dikes cutting Kus and Jln in vicinity of Nunavarchak Lake (only largest body shown). Consists of cream-colored, often iron-stained, aphanitic to porphyritic rhyolite to dacite. Phenocrysts are quartz, plagioclase, orthoclase, and accessory biotite and pyrite. Feldspars somewhat altered. 5n@iron-stainedmWnWoWirregularGWirregularlyWenFYields a K-Ar biotite age of 13.0 +/- 0.5 m.y.; however, its association with feeder dikes of Upper Cretaceous volcanic rocks suggest true intrusive age may be Late Cretaceous. GHG003H502IHagemeister IslandJIgneousK1053oATrBTertiary rhyoliteCTertiaryA5Abundant sills and dikes cutting Kus and Jln in vicinity of Nunavarchak Lake (only largest body shown). Consists of cream-colored, often iron-stained, aphanitic to porphyritic rhyolite to dacite. Phenocrysts are quartz, plagioclase, orthoclase, and accessory biotite and pyrite. Feldspars somewhat altered. 5FYields a K-Ar biotite age of 13.0 +/- 0.5 m.y.; however, its association with feeder dikes of Upper Cretaceous volcanic rocks suggest true intrusive age may be Late Cretaceous. GNG006H502I Nushagak BayJIgneousK1053pATnrBNukluk Volcanic Field; rhyoliteCTertiary, EoceneKtholeiiticRWSW[W\W]W^WtholeiiticbasaltofmekoryukRVSV[V\V]V^VtholeitticgWhWiWtholeitticbasaltofbinakslitbluffgVhViVtidalRWSWTWUWVWtidalflatdepositsRVSVUVVVtidalflatsTVtikchikWWWtikchikterranemarinesandstoneshalelimestoneandconglomVtikchikterranemassivevolcanicandvolcaniclasticrocksVhikterranemelangeVtillzWtogiakPWQWXWYW:WRWXWZW\WkWlWwWWtogiakterraneargilliteandtuffaceouschertRVtogiakterranemarinearkosicsandstoneandargillite\Vtogiakterranemarinevolcaniclasticsandstoneconglomerate:VZVtogiakterranephylliteandchertwVtogiakterranepillowbasaltXVtogiakterranepillowbasaltandminorinterbeddedchertVtriassicWWWWWWtriassic-lowersWtWuWWWWWWWWtrondhjemite|WtuffIWrWtWyW8W9W:WHWIWJWKWWdaciticjWkWlWrWdarkrWKWdark-coloredWWdark-coloreddikesandsillsconsistingofdiabasebasaltdiVVdark-graysWtWuWvWXWYWWWWW WWW&W'W,WWWWWWWWdark-graytoblackfinelylaminatedshalesiltstoneandthin&Vdark-greenWWWWdata@W6WdebriswWxWyW|WBWCWDWdecollementsmWnWoWdefinedkWlWWWdefiningWdeformationaWbWcWdWeWfWgWhWiWjWmWnWoWWWWWWWdeformedWW WaWbWcWdWeWfWgWhWiWjWmWnWoWxWyWzWWdegreesWWWositQWwWdepositedwWxWyW|WkWlWdepositionmWnWoWdepositionalWW WdepositionallyBWCWDWdepositsBWGWHWJWKWLWMWOWPWWWXWYWZW[W\W^W_W`WaWbWcWfWgWhWlWmWnWoWtWuWvWWFWGWHWJWWW WAWLWMWrWamountQW|W'W,WWamounts'W,W-W.W/WmWnWoWWWWWWWWWWWwW~W6WmWanastomosingmWandAWBWCWDWEWFWIWMWOWPWQWRWSWUWVWWWXWYW\W]W^W_W`WaWbWcWfWgWhWlWmWnWoWpWsWtWuWvWwWxWyWzW{W|W}W~WWBWCWEWKWLWNWOWPWQWTWUWVWXWYWZW_W`WaWbWcWdWeWfWiWjWkWlWmWnWoWpWqWrWwWxWyW{W|W}W~WWWWWWWWWWW W W W WWWWWWWWWWWWWWWWW W!W"W$W%W&W'W(W)W*W+W,W-W.W/W1W2W3W4W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWWzNincludetWuWvWWWWWincludedWincludesMWOWPWQWZW[WwWxWyW|WXWYWfWiW|WWWWincludingmWnWWW WLWMWWWWincreasingWindicatemWnWoWW{W}WinduratedWW WBWCWDWinferredtWuWinferredbyextrapolationfromadjacentbethelandgoodnewstVuVinneraWbWcWdWeWfWgWhWiWjWintenseWWintenselyWWinterbeddedqW$W%W'W+W,W4WBWCWDWEWTWUWVWXW[WaWbWcWdWeWfWgWhWiWjWkWlWrWsWtWuWvWxWyW{WWWWWWWWWWWWWWWWWWWWinterbeddedshalesiltstonesandstoneandconglomeratecompo%VinterbedsBWCWDWRWkWlWWintercalatedWinterflowXWYWintergranular WWWintergranular-textur WinterlayeredWintermediateWLWMWpDModerately altered rhyolite flows, domes, and ash-flow tuffs. Rhyolite of the main volcanic field contains phenocrysts of sanidine, riebeckitic amphibole, and rare quartz.F5Ar/Ar total-fusion age of 54.7+1.6 Ma from riebeckiteGBH002H1110IBethelJIgneousK1110qATnbaB*Nukluk Volcanic Field; basalt and andesiteCTertiary, EoceneDMassive, columnar-jointed, basalt and subordinate andesite flows. Minor latite and dacite. Overlies Tnr in Fog River area. Elsewhere, interbedded.GBH002H1111IBethelJIgneousK1111rATrBRhyolite and dacite tuffCTertiaryA$Chiefly rhyolite and dacite welded tuff and tuff breccia and dark rhyolite vitrophyre in the northern part of map area. Chiefly light-colored rhyolite and dacite hypabyssal rocks in the southern part of the map area. May be extrusive and hypabyssal cogenetic equivalent of granodiorite (Tg)$GST002H101I Saint MatthewJIgneousK1120sBAplite, St. George IslandC Quaternary{basaltNWOWPWQWRWSWTXWYWZ[W\W]W^WbWcWdWeWfWgWhWiWqWEWXWWWWWWbasaltoftogiakrivervalleyPVQVbasalticUWVWSWWbasalticandandesiticlavaflowsnyacterraneSVbasalticflowsstgeorgeislandVVbasalticflowsstpaulislandUVbasaltsWWbay]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWWblockwWblufffWgWhWiWbonanzaPWbuchia5W6Wcanyon Wcanyoncreekpluton VchertRWchert-clast"W)W*WclasticWW Wcolluvium columbiaPWconglomerate(W+W,W1W2W3W:W;W<WQWZW[WconglomeraticdWcoonradXWYWcreektWuWzWW WHWPWYWcretaceousWWW WWW W6WBWCWDWcrippleWcripplemountainplutonVcrooked Wcrookedmountainpluton Vcrystal-vitricIWdaciterWyWdeltaic)W*W&northernrWnorthwardWWnorthwestWW WBWCWDWsWtWuWWWnorthwest-directedWWWnorthwest-over-southmWnWoWnorthwest-trendingWWnorthwest-vergentWWnorthwesternaWbWcWdWeWfWgWhWiWjWWWnorthwestwardaWbWcWdWeWfWgWhWiWjWnotAWJWKWLWWW WWnotedWnow~WnsaWWWWWWnubblyfWnumerousmWnWoWWWnunavarchakmWnWoWnwWW WnyacPWobscured6Wobsidian|WoccasionalRWoccasionallyWoccurmWnWoWWWWWWWWWWWWoccuronlyatredandsusiemtnsatwestendofmapareamedVVoccurrencekWlWmWnWoWoccurrencesWWoccursWWWWodorWWWWWofQW^W_WaWbWcWfWgWhWmWnWoWpWtWuWvWW@WKWLWNWOWPWQWRWSWWWXWYW[WsDgAplite granite dike intruding peridotite. Surface weathered before eruption of overlying basatic flowsGPI002H400IPribilof IslandsJIgneousK1301tATKstB2Swift Creek Volcanic Field; Rhyolite ash-flow tuffC'Early Tertiary and (or) Late CretaceousDeFresh to moderately altered, densely welded rhyolite ash-flow tuff. Chiefly black glassy vitrophyre.GBH002H1600IBethelJIgneousK1603uATKsrB$Swift Creek Volcanic Field; RhyoliteC'Early Tertiary and (or) Late CretaceousD/Frost-riven rubble from single rhyolite dome(?)GBH002H1601IBethelJIgneousK1603vATKerBEek Volcanic Field; RhyoliteCPaleocene and Cretaceous (?)DPale pink to orange rhyolite domes found as small knobs or large domical hills as large as 4 km in diameter with 300 to 500 m in relief.F2Whole rock K/Ar age of 62.5+1.9 Ma and 59.3+1.8 MaGBH002H1603IBethelJIgneousK1603wATKtbB(Tulip Volcanic Field; Block and ash flowC'Early Tertiary and (or) Late Cretaceous+blufffWgWhWiWbodiesxWWW WBWCWDWNWWWWWWWWWWWWbodymWnWoWOWkWlWWWWbogQW`WaWbWcWbonanzaPWborder}WbothfWiWmWnWoWWWWWWWWWWWbottomaWbWcWdWeWfWgWhWiWjWboudinageWWboudinagedWWboudinsmWnWoWboulder+WBWCWDWbouldersWWXWYW\W]WwWxWyW{W|W}W~WWBWCWEWKWLWboulderyBWCWDWboundaryaWbWcWdWeWfWgWhWiWjWboundedWWWbox W)W2WjWuWWWWWWbox'spWvW{WbraidedWW WbreakingWWbrecciarW>WHWLWMWsWtWuWWWWWWWWWWWWbrecciasXWYWW?W@WEWHWTWUWVWqWsWtWuWvW{WWWWWWWWWWsWckWlWYfreshtomoderatelyaltereddenselyweldedrhyoliteash-flowtVfromaWbWcWfWgWhWoWtWuW@WUWVWuWWWWW W WWW'W)W,W2WBWCWDWHWPWTWUWVWaWbWcWdWeWfWgWhWiWjWmWnWoWrWvW{WWWWWWWWWWWWWWWWWWWWWWfrost-rivedMWOWPWQWfrost-rivenuWfrost-rivenrubblefromsinglerhyolitedomeuVgabbro WWWWWkWlWWWWWWWWWWWWWWWgabbrodiabasebasaltandbiotitelamphrophyreinstockssilVgabbroicWWsWtWuW}W~WWWgarnetiferousWWgaussfWgWhWiWgemukWWWWWWgenerallyXWYWWW WmWnWoWWWWWWgentlyAWaWbWcWdWeWfWgWhWiWjWjWjWÄBÄBÄB!!ÄB$"#ÄB&&'ÄB(-.ÄB1[ÄB245ZÄB36ÄBA\ÄBF?ÄBQEÄBbjÄCqwÄDaZÄEÄEaÄR&(ÄR(/ÄS&Äa7ÄaVÄaaÄaqÄaÄaÄc(Äc6ÄcQÄr'+Är8vÄr9{ÄrApÄrvÄrw ÄrxÄryÄtÄu#ÄvS ÄzÄ1ą1$`ąBP|ąBq@xąBs`}ąBv`ąBxąB',ąC7 OWPWSWTWVWWWYW[W\W^W`WbWdWeWfWiWjWkWlWmWqWrWsWtWwWyW|W}W~W@WAWCWDWPWXWjWlWmWoWWWWWWW W WWWWWWW W!W)W1W2W5W6W7W8W@WBWDWTW]W_W`WaWcWdWeWfWgWhWiWjWkWmWoWpWsWvWxWzW{W|W}WWbethel!6:?ETZpqtuvwxyz{|} "#$%&'(*+,3:;<=>EFGHIJKNOPQRSVWXYZ[\wLpaleoceneandcretaceousvV{VpaleozoicWWWWWWWWWpermianWW‚ÂWւpleistoceneFWwWxWyW:|WFWNWOWPQRWSWTZW[W\W]W^WbWcWdWeWpleistoceneandholoceneNVOVRVSV[V\V]V^VbVcVdVeVaspleistoceneorpliocene@tertiaryandcretaceous@turonian@F20@g3.0@600@actinolite@adjacentDfadjoining@against@alignment@8along@amount@amphibole@an@and}andesite@~andesitic@[are@areas@arkosic@0assumed@aat@attitudes@Cbasalticandandesiticlavaflows@%basalticandandesiticvolcanicandvolcaniclasticrocksext@basaltictodaciticvolcanicandvolcaniclasticrocksvolcan@based@be@between@+bluff@bright@caco3@channelized@tcherts@chieflyunsortedandpoorlysortedsandgravelandboulders@coarse@#coarse-grainedporphyritictoseriateleucocraticbiotitegr@common@complete@complex@W?W@WAWBWCWDWEWFWGWHWLWMWSWTWUWVW[WqWvW{WWWWWWWWW W6W7WHWKWfreshtWBWCWDW€AiMedium-grained granitic plutonic rocks, ranging from quartz monzonite to granodiorite to diorite, with accessory biotite and (or) hornblende (Hoare and Coonrad, 1978a). Intrude a variety of units across map, with narrow biotite-hornblende hornfels zones. Age based on several K-Ar determinations. Probably cogenetic with Upper Cretaceous volcanic rocks (Kuv). iF)Age based on several K-Ar determinations.GGO005H542I Goodnews BayJIgneousK1655€AKugB"Upper Cretaceous granitic plutons CLate Cretaceous AiMedium-grained granitic plutonic rocks, ranging from quartz monzonite to granodiorite to diorite, with accessory biotite and (or) hornblende (Hoare and Coonrad, 1978a). Intrude a variety of units across map, with narrow biotite-hornblende hornfels zones. Age based on several K-Ar determinations. Probably cogenetic with Upper Cretaceous volcanic rocks (Kuv). iF)Age based on several K-Ar determinations.GHG003H542IHagemeister IslandJIgneousK1655€ATKifcream-coloredmWnWoWWWcreekOWPWcrenulatedWcrenulationWWWcretaceous|WWWW WBWCWDWaWbWcWdWeWfWgWhWiWjWWWWcriteriaaWbWcWdWeWfWgWhWiWjWcrookedBWCWDWOWcropyWcropsWcross-beddedKWrWcrosscuttingsWtWuWWcrudelyPWcrystalLWMWsWtWuWxWyWcrystallineWWWWWWcumulus-texturedWcurrentsmWnWoWcutBWCWDWWWWWWWWWcutsWcuttingmWnWoWWWWcyclesWW WkWlWdkWlWd1WWWWd2WWWd3WWWd4WWWdacitemWnWoWqWrWwWyW{WFWLWMWWWWWWdaciteandsubordinateandesiteflowsandunderlyingdaciteyV6 labradoriteXWYWlackskWlWlacustrineFWWW WIWlacustrinefluvialandair-falltuffveryfinetofine-grainIVlaharLWMWlakeNWOWbWcWdWeWmWnWoWWWlaminaeWlaminatedWW W&WIWxWyW{WWWWlastwWxWyW|WlatepW@WAWDWlatealluvialsedimentsmostlysandinmostplacesthesandpVlateralzW{W}WlatiteqWlavaWW_W`WaWlavaflowsofhylobasaniteatleaat325feetthickalkalicWVlayerLWleaatWWleftLWlengthWlessXWYWlesserW"W#WleucocraticWlightsWtWuWvWxWWWWW WWWlighttodark-graysiltandsandysiltsVlighttomedium-grayfine-grainedporphyriticalbiterhyolitxVlight-coloredjWkWlWrWlight-coloredfine-grainedcommonlyporphyriticfelsicintrujVkVlVlithic{WWW WlithologywWlittleZWlocalwWxWyW|WlocallyOWPWQW^W_WfWgWhWoWtWuWvWKW}W$umedium-grayxWmekoryukRWSW[W\W]W^WmelangeNWWWmemberWW W6WkWlWocrystsXWYWminorXWYWqW{WWWmmwWmoderatelypWtW|WWmoderatelyalteredrhyoliteflowsdomesandash-flowtuffsrpVmonzodiorite WWWWWmonzoniteWWWWWWW W W WWWWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWWmostpW@WAWDWmostprobablyassociatedwithlatewisconsineventsAVDVmostlyBWpWWmottledfWmountain}WmovespWmudCWDWEWIWRWSWUWVW]Wmudsiltsandgravelbouldersandintermixedwoodpeatando]VmudrockFWmudstoneWWWnarrowWWW WnayorurunWnearWnoLWZWnonmarinetWuWvWWWWWnonporphyriticXWYWnormallyNWOWRWSW]W^WdWeWfWgWhWiWnorthpWWnorth-trendingWp] sedimentaryF !"#$%&')*+,-./0123456789:ARSTUVXZ[\]^_`abcdefghijklmnopqv{ɂʂ˂Ђт҂ӂւׂقtectoniteunconsolidated  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEKL ‚Ã! Ã!@Ã!`Ã"@ !"#Ã"`$%&'(Ã"p"p€B/Fisher Dome and Marvel Creek plutons, undividedC'Early Tertiary and (or) Late CretaceousA8Small intrusions of about 1 km (square). Hornblende-biotite granite and granodiorite porphyry. Randomly oriented euhedral brown hornblende, brown biotite, plagioclase, and resorbed quartz phenocrysts in a fine-grained aplitic matrix of quartz, plagioclase, potassium feldspar, and minor biotite and hornblende.8GBH002H1655IBethelJIgneousK1655€ATgBGranitic rocksC Tertiary(?)DhPink, light- to dark-gray, fine- to coarse-grained granite, quartz monzonite, granodiorite, and diorite.GBH004H31655IBethelJIgneousK1655€ATnB%Igneous rocks of Nayorurun River areaCTertiaryDsIntrusive-extrusive complex consisting of dikes, sills, and related tuffs and breccias in the Nayorurun River area.F*K/Ar age of 60.7 +/- 1.8 m.y. from biotiteGGO002H162I Goodnews BayJIgneousK1656€ATialBAniak Lake plutonCTertiary, Paleocene capeHWOWSW\WaWcWeWhWcapemendenhallHVOVSV\VaVcVeVhVgoodnewsJWOWPWVWWW[W`WkWsWwW}W~WCWPWXWjWmWWWWW W WWWWWW!W)W1W2W5W6W7W8WBWTW]WaWjWkWmWpWsWvWxWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWW]VaVjVkVmVhagemeisterKWMWUWXWZWxW{WBWFWQWYWkWnWWWWW9W?WCWUW^WbWlWnWhagemeisterislandKVMVUVXVZVxV{VBVFVQVYVkVnVVVVV9V?VCVUV^VbVlVnVinletCWRW_WcWgWnWuW_W-WislandDWGWKWMWUWXWZWhWoWxW{WBWFWNWQWRWYW[W]W^W`WbWdWfWgWiWkWnWWWWW.W/W0W9W?WCWUW^WbWlWnWislandspWGWHWIWJWKWLWMWUWVWWWsW~W €ACoarse-grained, porphyritic to seriate leucocratic biotite granite pluton 10 km (square) in area. Speckled texture with randomly oriented feldspar phenocrysts. Porphyritic rhyolite dikes common in the uppermost part of pluton and in surrounding biotite hornfels.F2Ar/Ar total-fusion age of 60.8+1.8 Ma from biotiteGBH002H1320IBethelJIgneousK1656€ATKgBGranitic rocksCTertiary and CretaceousDFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz diorite. Subdivision of granite from original Hoare and Coonrad (1978) unit.F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGGO006H6165I Goodnews BayJIgneousK1656€ATKgBGranitic rocksCTertiary and CretaceousDFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz dioriteFtertiaryandcretaceousVVV VVVVVtertiaryeocenepVqVtertiarypaleoceneVtertiarypliocenefVgVhViVto|W'W,WAWTWUWVW]W^W_W`WpWvW{WWWWWWWWWWWWWWWWtriassicsWtWuWwWWWWWWWWWWWWWWWWWWtriassicandpaleozoicVtriassicandpermianVVVV325WW4vW40W400WW W50aWbWcWW500vWW600WW W7UWVWaaWbWcWmWnWEWLWXWYWwW|W}W~WWWWW WWWWWWW W'WaboutXWYWWaboveaWbWcWabundanceWW WabundanttWuWvWmWnWoWWWWabundantsillsanddikescuttingkusandjlninvicinityofmVnVoVaccessoryXWYWmWnWoWWWW WacrossWWW WaddedcWadjacentbWtWuW%subglacialXWYWsubhorizontalkWlWsubophiticTWWWWWsubophiticholocrystallineplagioclase-clinopyrdiabasegraiVfWgWhWiWjWsubwaverWWWsugaryGWsuggestaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWrWsuggestedaWbWcWdWeWfWgWhWiWjWsummitWWWWW WBWCWDWsurfacemWnWLWsW~WsurfacesaWbWcWdWeWfWgWhWiWjWmWnWoWsurficialJWKWLW^W_WfWgWhWoWsurroundingWWWsusieWWWWsyenitic WtalcBWCWDWtallusyW|WtaluswWxWtanGWtentativelyWtephraNWOWbWcWdWeWterminologykWlWterraceMWOWPWQWterraces^W_WfWgWhWoWBWCWEWterraneWtextureTWXWYWWtexturedGWtgrW4WthanXWYWfWiWWW WHWYWWWthatzW WWW WIWmWnWoW €F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGNG002H165I Nushagak BayJIgneousK1657€AKugB"Upper Cretaceous granitic plutons CLate Cretaceous AiMedium-grained granitic plutonic rocks, ranging from quartz monzonite to granodiorite to diorite, with accessory biotite and (or) hornblende (Hoare and Coonrad, 1978a). Intrude a variety of units across map, with narrow biotite-hornblende hornfels zones. Age based on several K-Ar determinations. Probably cogenetic with Upper Cretaceous volcanic rocks (Kuv). iF)Age based on several K-Ar determinations.GNG006H542I Nushagak BayJIgneousK1657€ AKugB"Upper Cretaceous granitic plutons CLate Cretaceous OgranodioriterWWWWWWWWW W W W WWWWWWWW4WPWYWWWgranular WWWWgraphiteWWelBWCWDWEWIWQWRWSWUWVWWWXWYW\W]W^W_WwWxWyW{W|W}W~WWBWCWEWgravelsMWOWPWgray}W7WwWWWWgraygreenandblackphyllitefine-grainedtuffandtuffaceowVgray-greenWgraywacke!W'W(W,W-W.W/W1W4W5W;W<WQW]W^W_W`WpWWWWWWgraywackeandconglomeratemassivefinetocoarse-grainedha(V;V<VQVVgreen(W7W:W;W<WQWRWsWtWuWwWxWyWWWWWWWgreen-coloredkWlWgreenishWWWgreenschistrWWWWWWWWWWgreenschist-blueschiWWWWWWWgreenschist-faciesWWgreenstoneWgreywackeWgriscomWWgrit'W,W7W  € AMedium-grained granitic plutonic rocks, ranging from quartz monzonite to granodiorite to diorite, with accessory biotite and (or) hornblende (Hoare and Coonrad, 1978a). Intrude a variety of units across map, with narrow biotite-hornblende hornfels zones. Age based on several K-Ar determinations. Probably cogenetic with Upper Cretaceous volcanic rocks (Kuv). Subdivision of syenitic rocks from Box (1985)F)Age based on several K-Ar determinations.GGO006H6542I Goodnews BayJIgneousK1657€ ATKikB!Quartz monzonite of Kipchuk RiverC'Early Tertiary and (or) Late CretaceousDSmall (< 1 km (square)) quartz monzodiorite intrusion in Kkcd of Kuskokwim Group causing contact metamorphism of Kkcd. Medium-grained, intergranular-textured biotite-augite quartz monzodiorite and quartz diorite.GBH002H1656IBethelJIgneousK1658€ AKickBCrooked Mountain plutonCLate Cretaceous € ANLarge composite pluton with thin gabbro and diorite margin that partially rims and is intruded by massive core of biotite-hornblende granodiorite and granite. Dominantly augite-biotite-hornblende and (augite-) hornblende-biotite granodiorite, quartz monzonite, and granite. Intrudes and contact-metamorphosed Ksl, Kkv, Kvs, and KJc.NF2Ar/Ar total-fusion age of 69.8+2.1 Ma from biotiteGBH002H2460IBethelJIgneousK1658€ AKiccBCanyon Creek plutonCLate CretaceousDSmall (~1 km (square)), medium- to coarse-grained, intergranular to hypidiomorphic granular augite-biotite quartz diorite to hornblende-biotite granodiorite.F2Ar/Ar total-fusion age of 70.3+2.1 Ma from biotiteGBH002H2461IBethelJIgneousK1658€ ATKgBGranitic rocksCTertiary and CretaceousBpaulpWpbWWWWpeat]Wpebble'W+W,W-W.W/WZWpebbletoboulderconglomeratecoarsesandstoneandminorin+Vpebble-cobbleWWWperidotiteformsbasementofislandmassiveoriginallywasa~VpermafrosttWuWvWphaseWphasesWphenocrystsmWnWoWpWwWWWpinkvW}WWWWW WWWpinkandgrayfine-grainedquartz-feldsparporphyrylocally}Vpinklighttodark-grayfinetocoarse-grainedgranitequartVplacespWplagioclaseTWmWnWoWWWplainaWbWcWWW WplainsaWbWcWEWplantWWWpleistoceneKWLWpleistocenesedimentssomefossiliferouspolymicticbutcompKVplutonW WWWWplutonicWWWWWW W WWW%WpolarityNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWpolarizedNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWpolished~Wpolygon)Wtcaco3LWcady}Wcalc-alkalineBWCWDWcalcareous1W6WWWWWWWWWWWWWWWWWWcalcic}W~WcalciteWWWcalciticWcapFWcapeWWWWcappingzWcarbonaceousWWWWW WcastsLWcataclastizedWcausing WcementedLW7Wcentral}WWWWWWchaekuktuliWWchagvanWWWchannelaWbWcWdWeWfWgWhWiWjWjWnewithless'Vchieflyconsistsofconglomeratefaciesofinterbeddedgrayw,Vchieflyfrost-rivedrubblebutlocallyincludessmallamountQVchieflyfrost-rivedrubblelocallyincludesstreamalluviumOVPVchieflyfrost-rivedrubbleloccallyincludesstreamalluviumMVchieflylighttodark-graysiltandsandysiltcontainingabvVchieflyreworkedsiltsandysiltandbogdepositsunderlyingaVcVchieflyrhyoliteanddaciteweldedtuffandtuffbrecciaandrVcontact-metamorphose WWcontact-metamorphosiWcontaintWuWvWWWWcontainingtWuWvWLWWWWWHWcontainsTWpWwW5WcontrastingWW WconvolutedmWnWoWcoonrad@WXWYWWWWW W WWW)W2W6WkWlWuWWWWWWWcoquinas5Wcore WPWcornerWWcountryWWcoveWWWWcraterWWa#cream-colored@dacitic@delta@depth@derivedrderivedbyextensionfromadjacentgoodnewsbayquadranglem@diktytaxitic@divisible@earth@erosional@fan@few@;fine-grained@fining@6fluvial@mfraction@Yfreshtomoderatelyaltereddenselyweldedrhyoliteash-flow@geologic@granodiorite@ gravel@Oground@,hoare@ice-contact@zinclude@indicates@Nintermediateandsilicicpyroclasticdepositsincludingdaci@niron-stained@is@jurassic@klb2@labradorite@lamphrophyre@6lateral@Olight-graytotansugarytexturedfine-grainedandesiteflow@ilimy@5loccally@m@magnetite@Mof\older@other@paul@pebbles@Bplain@`polygons@primarily@Nraised@right@\ropy@scrap@sedimentaryrocks@occur@- € DFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz diorite. Subdivision of quartz monzonite from original Hoare and Coonrad (1978) unit.F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGGO006H6166I Goodnews BayJIgneousK1658€ATgB GranodioriteCTertiaryD$Fine-grained hornblende granodioriteF2K/Ar age of 62.2 +/- 2 Ma (recalc) from hornblendeGST002H102I Saint MatthewJIgneousK1660€ATicpBCripple Mountain plutonC PaleoceneDElliptical, erosionally recessive pluton, 40 km (square). Coarse-grained, hypidiomorphic-granular hornblende-biotite granodiorite and granite, with lesser quartz monzodiorite and quartz monzonite. Aplite dikes near pluton margin.F2Ar/Ar total-fusion age of 62.2+1.9 Ma from biotiteGBH002H1350IBethelK1660€ATKinBNorth Fork plutonC'Early Tertiary and (or) Late Cretaceous:VtialticptifjkltimtjihWtjiktjisYtjvbstkea{tkervtkg tkietkiftkigtkik tkintkiptkmAtksaztksrutkstttktbwtktdytmtntnbaqtnrptrmnorxtrbtrdstrjvbtutrpzmtrubtrudtrugW W2eW3fW4agW4bhW4ciWahzwiryukfWair-fallHWalbitexWalbiterhyolitexValkalicNWOWbWcWdWeWfWalkalicbasaltofahzwiryukblufffValkalicbasaltofkaronlakeNVOVbVcVdVeValluvialWWXWYW\W^W_WpWalluvialdepositsWVXVYV\V^V_ValluviumZW[W]WandXWYWqWrWwWyW{WWWWWW W&W(W1W2W3W4W7W8W9W:W;W<W=W>W?W@WAWEWIWLWMWPWQWRWSWTWUWVWZW[W\WaWbWcWdWeWfWgWhWiWjWqWrWvWwWxWyWzW{WWWWWW{€ATwo phases: Main Felsic Phase is seriate to hypidiomorphic granular (augite-) hornblende-biotite quartz monzodiorite, granodiorite, and minor biotite granite. Aplite dikes are common. Mafic Phase is a coarse-grained cumulus-textured augite quartz gabbro and quartz dioriteFCAr/Ar total-fusion age of 64.3+1.9 Ma from biotite in Felsic Phase.GBH002H1660IBethelJIgneousK1660€ATKgBGranitic rocksCTertiary and CretaceousDFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz diorite. Subdivision of tonalite-monzonite from original Hoare and Coonrad (1978) unit.F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGGO006H6167I Goodnews BayJIgneousK1660€ATKieB+Eek River pluton and related plutonic rocksC'Early Tertiary and (or) Late CretaceousYfossiliferousKWLWfossiliferoussedimentsstgeorgeislandLVgabbroWroic}W~WWWgabbroicrocks}V~VgemukW(W;W<WQWgemukgroupgraywackesiltstoneandconglomerate(V;V<VQVgemukmountainplutonVgeorgeIWJWLWVWsW~WglacialwWxWyWzW{W|W}W~WWglacialdepositswVxVyV|Vglacialdrift{V}V~VVglacialtillzVgoodnews2W3WgraniticWWWWWWW W WWWWgraniticrocksVVVV VVVVgranodioriteWgraywacke(W1W4W5W6W;W<WQW]W^W_W`WpWgraywackeandconglomerate1Vgraywackeofbuchiaridge5Vgraywackeofkulukakbay]V^V_V`VgraywackeofkulukakbaysubdividedpVgraywacke-siltstone-W.W/Wgraywacke-siltstonesequence-V.V/VgreenstoneWgrit7Wgroup!W"W#W$W%W&W'W(W)W*W+W,W;W<WQWWWtwophasesmainfelsicphaseisseriatetohypidiomorphicgrVtwo-pyroxeneFWtypemWnWoWtypesWmWnWoWWWWtypicallyrWultramaficWWWWWWWunalteredTWunalteredolivinetholeiitebasaltflowshavingdiktytaxiticTVuncertainmWnWoWWWWunconformable|WunconformablyWWunconformity6WWWunconsolidatedFWGWHWmWnWzW€A'Sill 50 to 500 m thick crops out in discontinuous exposures over 10 km length cutting and contact-metamorphosing Kkcd of Kuskokwim Group north of Eek River. Dominantly medium- to coarse-grained, porphyritic to diabasic (hornblende) augite diorite, quartz diorite, and mafic quartz monzodiorite.'GBH002H1665IBethelJIgneousK1665€ATKigBGemuk Mountain plutonC'Early Tertiary and (or) Late CretaceousDElongate, north-trending, erosionally resistant, mafic to intermediate quartz gabbro to mafic granodiorite pluton, 25 km (square). Cuts and contact-metamorphoses units Kkv of Kuskokwim Group and Kvs of Togiak Terrane.GBH002H1666IBethelJIgneousK1665€ATKipBMt. Plummer plutonC'Early Tertiary and (or) Late CretaceousDMedium- to coarse-grained, erosionally resistant, hypidiomorphic granular augite-biotite mafic granodiorite, quartz monzodiorite, and quartz diorite pluton. Intrudes and contact metamorphoses Kkmf, Kksh, and Kkcd of Kuskokwim group.€F5K/Ar ages of 65.5+2.0 Ma and 66.6+2.0 Ma from biotiteGBH002H1667IBethelJIgneousK1665€AKihdB#Hornblende diorite stocks and dikesCLate CretaceousDgSmall, extensively altered, hornblende diorite stocks and dikes containing relict euhedral plagioclase.F5Ar/Ar total-fusion age of 68.0+2.0 Ma from hornblendeGBH002H2490IBethelJIgneousK1665€ATKgBGranitic rocksCTertiary and CretaceousDFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz diorite. Subdivision of quartz diorite and diorite from original Hoare and Coonrad (1978) unit.F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGGO006H6168I Goodnews BayJIgneousK1665€ATimBMafic intrusive rocksCTertiaryDhDark-colored dikes and sills consisting of diabase, basalt, dioritic and gabbroic mafic intrusive rocks.F(K/Ar age of 64.6 +/- 2 m.y. from biotiteGGO002H161I Goodnews BayJIgneousK1670€ATim]Gw ABCDEFGHI J K L M N   !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~  !"#$%&')*+,-./0123456789:=>?@ABCDEFGHIJKLMNOPRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~‚‚‚‚‚‚‚‚‚‚‚‚{diktytaxiticTWXWYWdillinghamWdioriteWWWWWWW W W W W WWWWWWWWWWWWdioriticWWaWbWcWdWeWfWgWhWiWjWdipWWdipping|WAWBWCWDWWWWdiscontinuousWWWdisintegrateLWdismemberedaWbWcWdWeWfWgWhWiWjWmWnWoWWWWdismembermentWWdisruptionmWnWoWdistinguishedmWnWoWWWdistributionWWdivergentrWdividedaWbWcWdWeWfWgWhWiWjWongatenorth-trendingerosionallyresistantmafictointerVelsewhereqWendzW{W}Wenhanced@WentirelyBWCWDWeolianCWDWEWFWIWtWuWvWepiclasticBWCWDW[Wepiclasticsequenceoftuffaceousmarinesandstoneshaleand[VepochNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWequivalentrWerodedoWerosion~W €BMafic intrusive rocksCTertiaryDgDark-colored dikes and sills consisting of diabase, basalt, dioritic and gabbroic mafic intrusive rocksF(K/Ar age of 64.6 +/- 2 m.y. from biotiteGHG002H161IHagemeister IslandJIgneousK1670€ATKgBGabbroCTertiary and CretaceousD2Medium- to coarse-grained pyroxene gabbro dike (?)GST002H202I Saint MatthewJIgneousK1670€ATmB Mafic rocksC Tertiary(?)DNGabbro, diabase, basalt, and biotite lamphrophyre in stocks, sills, and dikes.GBH004H31670IBethelJIgneousK1670€AKsB"Sedimentary rocks of Summit IslandC#Late Cretaceous (Maestrichtian (?))DSedimentary rocks of Summit Island. A sequence of intertonguing nonmarine conglomerate, sandstone, shale, and carbonaceous mudstone containing abundant plant detritus and a few coal seams. E%Palynomorphs indicate Late CretaceousGGO002H120I Goodnews BayJ SedimentaryK1960€AKsB"Sedimentary rocks of Summit IslandC#Late Cretaceous (Maestrichtian (?)).maficintrusiverocksVVmaficrocksVmaficvolcanicrocks_V`VaVmappedAWmarbleWmarbleandmetabasalticdikesgoodnewsterraneVmarbleizedWmarbleizedlimestoneVmargingWiWmarinemWnWFW:WZW\WWWmarineterracemVnVmarvelWmassivefWWmekoryukRWSW[W\W]W^WmelangeWWWmesozoicWWWmesozoicandpaleozoicrocksundividedVVVmetabasaltWmetabasaltandminormetachertgoodnewsterraneVmetabasalticWWWWmetachertWWWWmetagabbroWmetagabbroandgreenstoneVmetamorphicWWmetamorphiccomplexVmetamorphicrocksofkanektokriverregionVVmiddlejurassicgranodioriteplutonVmiddlejurassicinterbeddedvolcanicandsedimentaryrocksVVmiddlejurassicultramaficplutonsVVmiddlejurassicvolcaniclasticturbiditesoftogiakbaykVlVmixed#W$Wmonzonite W\"ropyXWYWrotationmWnWoWround7WBWCWDWWWroundedLW%WWWrubbleMWOWPWQWuWs1WWs2WWWWWWWWsaintAWsamewWsandBWCWDWEWFWIWRWSWUWVWWWXWYW\W]WpWqWrWwWxWyW{W|W}W~WWEWLWsandiertWuWvWsandstoneWWWWW W!W"W#W$W%W&W'W)W*W+W,W2W3W6W:WBWCWDWKW[W\WaWbWcWdWeWfWgWhWiWjWmWnWoWWsandstonesandyconglomeratepebblymudstonesiltstoneands2V3Vsandstone-rich$Wsandstone-shalemWnWoWWWsandstonesWW WBWCWDWkWlWmWnWoWrWWWsandy`WaWbWcWsWtWuWvWWW W2W3WBWCWDWaWbWcWdWeWfWgWhWiWjWsanidinepWscalymWnWoWschistoseWWWWWWWWWWWWWWWWWWhg003 YnCblnrtyhg005 ;Bkb001kb002kb003 "&-4ng001ng002$)19Al@_`ng006 o Dcdefghiong007%*,2<@Dni002`./ni003NR[]^bdfgi0ni004(/pi0020GHIJKLMUVWs~st002r4ALM 0`_`a-.‚!/2csedimentaryrocksofsummitislandVVVsedimentspWKWLWsemiconsolidatedFW!€DSedimentary rocks of Summit Island. A sequence of intertonguing nonmarine conglomerate, sandstone, shale, and carbonaceous mudstone containing abundant plant detritus and a few coal seams. E%Palynomorphs indicate Late CretaceousGHG002H120IHagemeister IslandJ SedimentaryK1960€AKsB"Sedimentary rocks of Summit IslandC#Late Cretaceous (Maestrichtian (?))DSedimentary rocks of Summit Island. A sequence of intertonguing nonmarine conglomerate, sandstone, shale, and carbonaceous mudstone containing abundant plant detritus and a few coal seams. E%Palynomorphs indicate Late CretaceousGNG002H120I Nushagak BayJ SedimentaryK1960€AKusB\Upper Cretaceous nonmarine clastic rocks (Summit Island Formation of Hoare and others, 1983)CLate Cretaceous "€ANonmarine clastic rocks, moderately to well indurated, including (in order of abundance) black carbonaceous shale, fine to coarse sandstone, conglomerate, and thin coal seams. probable depositional contact on deformed older rocks not exposed. Divisible into two subbasins by trace of Togiak fault, based on contrasting sandstones compositions. Sandstones of the Summit subbasin (SE of the Togiak fault) composed mostly of slaty sedimentary lithic fragments, similar to underlying Jurassic rocksB (Jln, Jmm). More than 1 km thick. Consists of lower conglomeratic member (200 m) of probable alluvial fan to braided stream origin, and upper carbonaceous shale member, with channelized sandstone bodies that fine and thin upward, of probable meandering stream-flood plain origin. Paleocurrents in upper member generally to the northeast. Sandstones of Hagemeister subbasin (NW of Togiak fault) composed of unfoliated volcanic detritus, similar to underlying Jurassic rocks (Jmv, Jlv). Hagemeis!'[€CXter section more than a kilometer thick, consisting of lower channelized sandstone member (600 m) of probable meandering stream origin, and upper sandy member (400 m) with coarsening/thickening upward cycles beginning with laminated siltstone-coal intervals; possibly lacustrine delta deposits. Paleocurrents generally to the northwest. 4EFFossils pollen suggest a Late Cretaceous, possibly Maestrichtian, age.GGO005H506I Goodnews BayJ SedimentaryK1960€AKusB\Upper Cretaceous nonmarine clastic rocks (Summit Island Formation of Hoare and others, 1983)CLate CretaceousMcoarsewWWW W$W+W6WBWCWDWZWkWlWvWcoarse-grainedWWWWW W WWWWWWWWHWPWkWlWxWyW}W~WWWWWWWWWWWWWcoarse-grainedpinkgneissandmediumtocoarse-grainedlighVWWWWcoarsening/thickeninWW WcoastBWCWDWcoatedqWcobbleWWWWWWWcodedWcoeval7WWWcogeneticrWWWW WWWWWcoherentlyaWbWcWdWeWfWgWhWiWjWcoherentlydeformedvolcaniclasticturbiditessoutheastofraVbVcVdVeVfVgVhViVcollapsewWcolluvialBWFWcolluviumCWDWEWIWwWxWyW|WWcolumbiaPWcolumnarPWQWXWYW{Wcolumnar-jointedRWSW[W\W]W^WgWhWiWqWyWzWWWcolumnar-jointedandesiteflowscappingsmallhillsthatovezVcombinationWWWmemberstWuWvWmertieWWmesozoicmWnWoWWWmetabasaltWWmetachertWWWWmetagabbroWmetamorphicWWWWWWWWWmetamorphic-mineralWmetamorphism WBWCWDWWWWmetamorphosedMWWmetamorphosesWmicaWWWmica-richWmicrocrystsXWYWmicrofoldWWWmid-oceanWmiddlekWlWmWnWoWrWsWtWuWWWWWWWWWWWWWWmidfanaWbWcWdWeWfWgWhWiWjWkWlWmildlyWWmileWWlydippingfreshtoweaklyalteredporphyBVCVDVmonzodiorite WWWWWmonzoniteWWWWWWW W W WWWWPWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWWW W(W;W<WBWCWDWQWTWUWVW {streams^W_WstretchingWWWstriae~WstrongWWWWWWWWWstronglyWWWstronglycleavedmedium-grainedgenerallythin-beddedarkosiVstronglylineatedandfoliatedmuscovitebiotite-muscoviteoVstructuralmWnWoWrWWWWWWWWstructurallyWWWWWWWWWWWWWWWWWstructurallycomplexassemblageofintercalatedchertlimestVstructure}WqWWstructuresxWmWnWoWsuWWWWWsubaerialXWYWBWCWDWsubaerialalkaliolivinebasaltflowscolumnarjointedwithXVYVsubbasinWW WsubbasinsWW Wsubdivide)WsubdivisionW W WWWvW{WsubdivsionpWsubdivsionofunitintobox's1985volcaniclasticturbiditespVMnonmarineclasticrocksmoderatelytowellinduratedincludiVV VnonporphyriticXWYWnonweldedLWMWnormallyNWOWRWSW]W^WdWeWfWgWhWiWnorthpWW2W6WOWWWnorth-trendingWnortheastWW WkWlWWWWWnortheast-dippingWnortheast-plungingaWbWcWdWeWfWgWhWiWjWnortheast-trendingkWlWWWW"(€ANonmarine clastic rocks, moderately to well indurated, including (in order of abundance) black carbonaceous shale, fine to coarse sandstone, conglomerate, and thin coal seams. probable depositional contact on deformed older rocks not exposed. Divisible into two subbasins by trace of Togiak fault, based on contrasting sandstones compositions. Sandstones of the Summit subbasin (SE of the Togiak fault) composed mostly of slaty sedimentary lithic fragments, similar to underlying Jurassic rocksB (Jln, Jmm). More than 1 km thick. Consists of lower conglomeratic member (200 m) of probable alluvial fan to braided stream origin, and upper carbonaceous shale member, with channelized sandstone bodies that fine and thin upward, of probable meandering stream-flood plain origin. Paleocurrents in upper member generally to the northeast. Sandstones of Hagemeister subbasin (NW of Togiak fault) composed of unfoliated volcanic detritus, similar to underlying Jurassic rocks (Jmv, Jlv). Hagemeis')a€CXter section more than a kilometer thick, consisting of lower channelized sandstone member (600 m) of probable meandering stream origin, and upper sandy member (400 m) with coarsening/thickening upward cycles beginning with laminated siltstone-coal intervals; possibly lacustrine delta deposits. Paleocurrents generally to the northwest. 4EFFossils pollen suggest a Late Cretaceous, possibly Maestrichtian, age.GHG003H506IHagemeister IslandJ SedimentaryK1960€ AKusB\Upper Cretaceous nonmarine clastic rocks (Summit Island Formation of Hoare and others, 1983)CLate Cretaceous(*€ ANonmarine clastic rocks, moderately to well indurated, including (in order of abundance) black carbonaceous shale, fine to coarse sandstone, conglomerate, and thin coal seams. probable depositional contact on deformed older rocks not exposed. Divisible into two subbasins by trace of Togiak fault, based on contrasting sandstones compositions. Sandstones of the Summit subbasin (SE of the Togiak fault) composed mostly of slaty sedimentary lithic fragments, similar to underlying Jurassic rocksB (Jln, Jmm). More than 1 km thick. Consists of lower conglomeratic member (200 m) of probable alluvial fan to braided stream origin, and upper carbonaceous shale member, with channelized sandstone bodies that fine and thin upward, of probable meandering stream-flood plain origin. Paleocurrents in upper member generally to the northeast. Sandstones of Hagemeister subbasin (NW of Togiak fault) composed of unfoliated volcanic detritus, similar to underlying Jurassic rocks (Jmv, Jlv). Hagemeis)/€ CXter section more than a kilometer thick, consisting of lower channelized sandstone member (600 m) of probable meandering stream origin, and upper sandy member (400 m) with coarsening/thickening upward cycles beginning with laminated siltstone-coal intervals; possibly lacustrine delta deposits. Paleocurrents generally to the northwest. 4EFFossils pollen suggest a Late Cretaceous, possibly Maestrichtian, age.GNG006H506I Nushagak BayJ SedimentaryK1960€!AKkBKuskokwim GroupC CretaceousDuKuskokwim Group. Marine sedimentary sequence consisting of graywacke, sandstone, conglomerate, siltstone, and shale.EPEarly Cretaceous (Albian) age assigned from fossils found north of the map area.GGO002H121I Goodnews BayJ SedimentaryK1970€"AKkcfBIKuskokwim Group; Chert-clast provenance rocks; Outer-fan turbidite faciesCLate Cretaceous (Turonian)DuThin-bedded, fine-grained, quartzose sandstone and slate with lesser thin- and thick-bedded medium-grained sandstone.DlatecretaceousVVV V V VVVV V-V.V/V=V>VBVCVDVFVGVKVLVMVNVlatecretaceouscampanianHVlatecretaceouscenomanian+Vlatecretaceousearlyturonianandorlatecenomanian&VlatecretaceousmaastrichtianEVJVlatecretaceousmaestrichtianVVVIVlatecretaceousturonian"V#V$V%V)V*VlatetriassicVVVVVmaestrichtianWWWIWmiddle|W'W,WTWUWVW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWvW{WWWWWWWWWWmiddlejurassickVlVVVVVVVVVmiddlelatecenomaniamandconiaciantolateearlycretaceou'V,Vmiddletoearlylatejurassic]V^V_V`VpVVmiddletolatetertiary|Vmississippian(W;WorFWZWtWuWwWyWzWW WWWWW&WRWSWXWOgroundzWgroundmassKWWWgroup WWWW!WWWWWWWh2sWWhagemeisterWW WBWCWDWrWWWWhallAWhandBWCWDWaWbWcWdWeWfWgWhWiWjWhard1W]W^W_W`WpWWWWWWhareWharzburgiteWWhasLW~Whauterivian6WhaveLWmWnWoWxWyWzWhavingTWKWWWWhighaWbWcWWhigheraWbWcWWhighlyZWWWxWyWzWWWWWWhighlyalteredrhyoliteanddaciteporphyriesWVhighlyvesicularandscoriaceousblackolivinebasaltflowsZVhillWWWWhillsvWzW=WJWWWhistoryrWWWWWWWWPWhornfelsWWWW Whornfelsed`WhotwWhowever@WLWhylobasaniteUWWWhypabyssalrWkWlWhypidiomorphic WWWhypidiomorphic-granuWYWikWlWmWnWoW:+occurtWuWvWmWnWoWoccurances&Woccurences#W%W)W*WoccurrencekWlWmWnWoWoccurrencesWWoftWuWvWFWLW!W&W1W2W3W7W8W9WTWUWVW[WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWqWrWvWwWxWyWzW{WWWWWWWWWWWWWWWWWWWWWon"W#W%W)W*WWWWWonexWyWzWor&W2W3WRWordovicianWWrinefossilsofplio-pleistoceneageFVsuggestWW Wthe!Wthree"WtoptWuWvWturonian"W#W%Wtwo#Wbh002:Tpqtuvwyz{ "#$%bh004!6?EZx|}bi001bi002_bi003#'.5cm002acm003OS\cehgo001go0027Pj!go005 Xmgo006+> go008 3=Chg001hg0028FQk-bh003@hg003@Ã!@Ã`@ÄB@ąCb@ bethel@cape@goodnewsbay@inlet@islandislands@kuskokwim@saintmatthew@p sedimentary@ Ã"piÄ9C@VÄI @cdCec*4q€"EOAge considered Turonian (Late Cretaceous) based on three megafossil collectionsGBH002H1970IBethelJ SedimentaryK1970€#AKkmfBCKuskokwim Group; Mixed provenance rocks; Outer-fan turbidite faciesCLate Cretaceous (Turonian)DYShale-rich sequence with lesser thin- to thick-bedded, medium-grained sandstone sections.ELAge considered Turonian (Late Cretaceous) based on two megafossil occurencesGBH002H1972IBethelJ SedimentaryK1970€$AKkmcBAKuskokwim Group; Mixed provenance rocks; Inner-fan-channel faciesCLate Cretaceous (Turonian)DMixed shale-rich and sandstone-rich sections, with coarse sandstone and pebbly sandstone in thick-bedded, amalgamated sequences with minor interbedded shale.E4Recovered fossils are nondiagnostic Cretaceous formsGBH002H1973IBethelJ SedimentaryK1970€%AKkvB*Kuskokwim Group; Volcanic provenance rocksCLate Cretaceous (Turonian)@.1kuskokwimgroupchert-clastprovenancerocksouter-fanturbi"Vkuskokwimgroupmixedprovenancerocksinner-fan-channelfac$Vkuskokwimgroupmixedprovenancerocksouter-fanturbiditef#Vkuskokwimgroupsedimentaryrocks'Vkuskokwimgroupsedimentaryrocksconglomeratefacies,Vkuskokwimgroupshaleandsiltstone&VkuskokwimgroupvolcanicbrecciaVkuskokwimgroupvolcanicprovenancerocks%VkuskokwimgroupvolcanicrocksVlakeNWOWbWcWdWeWWlaminatedxWyWzWlatepWlatealluvialsedimentsmostlysandstpaulislandpVlavaSWWlimestone7WWWWWWWWWWWWlimestoneandcalcareoussiltstoneandsandstoneVlimy7Wlimygritandlimestone7VlithicHWJWKWvolcaniclasticturbiditesmVnVoVlowerjurassicinterbeddedvolcanicandsedimentaryrocksrVmafic_W`WaWWWWAWmaficflowsandvolcaniclasticdepositsAVtholeiitePWQWTWtholeiiticRWSW[W\W]W^Wtholeiiticbasaltofmekoryukmassivecolumnar-jointedflowsRVSV[V\V]V^VtholeitticgWhWiWtholeitticbasaltofbinakslitbluffmassivecolumnar-jointegVhViVthoroughlyWWthoroughlyserpentinizedultramaficrocksprotolithswereprVVthoseWWWWthreewWxWyW|WthrustaWbWcWdWeWfWgWhWiWjWtidal^W_WtightWWtightlyaWbWcWdWeWfWgWhWiWjWkWlWtightlyfoldedvolcaniclasticturbiditesatleast1.7kmthikVlVtillzWtiny7WtithonianxWyWzWWWWWWWWWW W W WWWWWWWWWW W#W&W'W(W)W+W,W2W6W:W;W<W=W>W?W@WAWBWCWDWGWHWIWPWQWRWTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWQsandpWsandstone2W3W:WIWZW[W\WWWWWWWWschistWWWWWschistandmetachertVschistandmetachertlimestoneVschistsWWWWWWWsedimentaryMWWWW'W,W0W8W9WTWUWVWqWrWvW{WWWWWWsedimentarydepositsotterislandMVsedimentaryrocks0Veageconsideredturonianlatecretaceousbasedontwomegafos#VageconstrainedbyconodontsoflatestdevoniantoearliestVageconstrainedbymegafossiloccurancesoflatecenomanian&VagegivenbyshellfragmentsofatomodesmaspVVages5WWWWWalbian!W'W,Wammonite]W^W_W`WpWammonites6WTWUWVWvW{WandtWuWvWLW&W'W,W2W3W5W:WRWTWUWVW]W^W_W`WkWlWmWnWoWpWrWvW{WWWWWWWWWWWWWWWWWare$W'W,WWWarea!WkWlWWargilliteWWasmWnWoWxWyWzWassemblagesLWMWassigned!WWassociatedWWatWWWWWatomodesmaWWWWbajocian[WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWWofear8V9Vby&WcarbonaceousLWMWcenomaniam,W/;€%DInterbedded shale, siltstone, sandstone, and conglomerate composed of rounded clasts of volcanic, volcaniclastic, and plutonic rocks.EHAge considered Turonian (Late Cretaceous) based on megafossil occurencesGBH002H1974IBethelJ SedimentaryK1970€&AKkshB$Kuskokwim Group; Shale and siltstoneC9Late Cretaceous (Early Turonian and (or) Late Cenomanian)DcDark-gray to black, finely laminated shale, siltstone and thin-bedded, very fine grained sandstone.EAge constrained by megafossil occurances of late Cenomanian and (or) early Turonian age low in section and by overlying units of Turonian ageGBH002H1975IBethelJ SedimentaryK1970€'AKksB"Kuskokwim Group, sedimentary rocksCHmiddle Late (Cenomaniam and Coniacian) to late Early Cretaceous (Albian)9volcaniclastic%W6WAWBWCWDWZWaWbWcWdWeWfWgWhWiWjWkWlWpWrWvWWWWWWWWWWWvolcaniclasticsedimentaryrocksrangingfromcoarselybeddeVVOhlamphrophyreWlandslidewWxWyW|WlargevW WHWWWlargecompositeplutonwiththingabbroanddioritemargint VlargelyGWJW~WlargerWlargestmWnWoWlastwWxWyW|WlatepW@WAWDWBWCWDWWWWWWWlatealluvialsedimentsmostlysandinmostplacesthesandpVlater6Waat325feetthickalkalicWVlayerLWleaatWWleast6WleftLWlengthWlessXWYWlesserW"W#W'W,WleucocraticWlightsWtWuWvWxWWWWW WWW'W(W,Wlighttodark-graysiltandsandysiltsVlighttomedium-grayfine-grainedporphyriticalbiterhyolitxVlight-coloredjWkWlWrWlight-coloredfine-grainedcommonlyporphyriticfelsicintrujVkVlVlimestone(Wlithic{WWW W6Wlithic-feldspathic(WlithologywWlittleZWlittoral-W.W/WlocalwWxWyW|W1W5WlocallyOWPWQW^W_WfWgWhWoWtWuWvWKW}Wkshale-rich#W$Wshale-richsequencewithlesserthintothick-beddedmedium-#VshalesrWWWshallow6WrWWshallowlyWWWshaly1WshardssWtWuWshearmWnWoWWWshell5W7WWWshellsLWshorepWWWshowmWnWoWWshowbyextensionfromboxandothers1993argillaceousmelaVshowingZWkWlWshownmWnWoWuWWWWshowsxW}W~Wsilica-carbonateNWsiliceous|W4WWWsilicicLWMWsilicieousWsiliciousWWWWWsillWsill50to500mthickcropsoutindiscontinuousexposuresVsillsUWVWjWkWlWmWnWoWxWWWWWLWMWWWsiltCWDWEWFWIWMWOWPWQWRWSWUWVWWWXWYW\W]W^W_W`WaWbWcWsWtWuWvWwWxWyW{W|W}W~WBWCWEWF;shale-rich@7siltsandysiltandbogdeposits@siltstone-coal@Kslightly@qsoutheast@streams@%subglacial@ subordinate@summit@ the@thickbeddedquartzosesandstonepebblysandstoneandsubord@thintothick-beddedgreentuffaceoussandstonesiltstonear@=thirditholeiite@1tkg@toptogiak@_tuff@twophasesmainfelsicphaseisseriatetohypidiomorphicgr@unconsolidatedalluvialcolluvialglacialoutwashlacustrine@undifferentiated@bunsheared@uppermost@very@vesicular@9volcaniclastic%5volcano@warren@white@yields@eageconsideredturonianlatecretaceousbasedontwomegafos@3basal@cenomanian@Gconstrained@fossiliferous@fossilscollectedfrombasalzoneareconsideredlateearly@fragmentary@wgastropods@indicate@jurassic@on@>5vesicularUWVWZWsWtWuWvicinitymWnWoWWvitroclasticKWvitrophyrerWtWvitrophyriticLWMWvolcanicFWTWXWYWZWpWWWW WWW W%W'W,W-W.W/WBWCWDWKWLWMWTWUWVWaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWqWrWvW{WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWvolcanicandsedimentaryrocksconsistingofandesitictrachVvolcanicgraywackesiltstoneandminoramountsofpebblecon-V.V/Vvolcaniclasticasticinoramountsofpebblecon-V.V/Vvolcaniclasticasticasticonsistvolcaniclasticasticasticasticasticasticasticasticastic-organictWuWvWorganicmuckcontainingmammothremainsandnonmarinegastrotVuVvVoriginallyWWoriginallycalledcretaceousonmapnoterevisedtojurassicVVother5Woverlying&WoxfordianaWbWcWdWeWfWgWhWiWjWpaleozoicWpalynomorphsWWWpalynomorphsindicatelatecretaceousVVVpelecypod2W3Wpelecypodfossilcollectionofvalanginianandoflatejuras2V3VpelecypodsLW:W[WkWlWqWWWWWWpelecypodsandgastropodsofpleistoceneageLVpelecypodsoflatetriassicageVVpermianWWWWWWWpermianpelecypodsandpermianconodontsVVphanerozoicWWpleistoceneLWplio-pleistoceneFWpollenWW WLWMWpollenassemblagesfromcarbonaceoustuffsLVMVpoorlyRWmWnWoWpoorlypreservedradiolariafromsf1havebeenidentifiedasmVnVoVeWfWgWhWiWjW4=€'AChiefly consist of interbedded graywacke, siltstone, with lesser amounts of pebble grit and conglomerate and a small amount of coal. Well-indurated, commonly light- to dark-gray and weather brown. Vary from volcanic wacke to quartz-chert-feldspar-rich sandstone.EFossils collected from basal zone are considered late Early Cretaceous (Albian) age and fossils from the upper zone considered early and middle Late Cretaceous (Cenomanian and Coniacian)GBH004H31970IBethelJ SedimentaryK1970€(AKCggB3Gemuk Group, graywacke, siltstone, and conglomerateC$Early Cretaceous to Mississippian(?)`FcomplexWkWlWmWnWoWWWcomplexityWcomponentaWbWcWdWeWfWgWhWiWjWmWnWoWcomponentsWcomposedKWWW W%W6WkWlWmWnWoWWWWWWcomposite WcompositionTWUWVWvW{WcompositionalWcompositionallyUWVWcompositionsWW WaWbWcWdWeWfWgWhWiWjWcompressionWWWcomprisingWXWYWconcentricallyPWconesNWOW_W`WaWbWcWdWeWcongeneticBWCWDWconglomerateFWLWWWWWW W!W%W'W+W,W-W.W/W1W2W3W5W6W:WAWLWMWZW[W]W^W_W`WpWWWWWWWWWWWWWWWWWWconglomeratesBWCWDWkWlWWWWWWconglomeraticWW W7WaWbWcWdWeWfWgWhWiWjWkWlWconprisesWWW;?f€)AKkcdB=Kuskokwim Group; Chert-clast provenance rocks; Deltaic faciesCLate Cretaceous (Turonian)hin-bedded, light- to dark-gray and green lithic-feldspathic graywacke; massive varicolored argillite; banded slaty siltstone; minor amounts of limestone, calcareous graywacke, andesitic volcanic rocks, chert and silicious tuff(?). Graywacke, conglomerate and siltstone very similar to Kuskokwim group. Silty limestone, calcareous graywacke and siltstone more common in Gemuk. (Eastern part of unit iB?s 2830; central is assigned to NSA class 2320 and west to 1970.-EiFossils of early Cretaceous (Valanginian) and Late Jurassic age collected at widely scattered localities.GBH004H32830IBethelJ SedimentaryK1970€)AKkcdB=Kuskokwim Group; Chert-clast provenance rocks; Deltaic faciesCLate Cretaceous (Turonian)section&WseveralxWyWzWWWseveralchertshaveyieldedradiolariaofjurassicageoneoxVyVzV-pleistoceneageFVshow5WsimilarmWnWoWsinglewWsingleradiolariancollectionofearlyjurassicagewVslatemWnWoWstratigraphicallymWnWoWsuggestWW Wthat5Wthe!W'W,WthereforemWnWoWthirdaWbWcWdWeWfWgWhWiWjWthismWnWoWthree"Wtithonian[WxWtoTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWmWnWoWpWvWtogiakkWlWtoptWuWvWtuffsLWMWturbiditesmWnWoWturonian"W#W%W&W)W*Wtwo#WunitaWbWcWdWeWfWgWhWiWjWrWunits&Wupper'W,WaWbWcWdWeWfWgWhWiWjWrWupperunitofabundantlyfossiliferouswellbeddedsandstonerV 3=Chg001hg0028FQk9?U^=C€)DThick bedded quartzose sandstone, pebbly sandstone, and subordinate siltstone and shale. Re-assigned polygon from Hoare and Coonrad (1978) to subdivide Kuskokwim to match Box and others (1993)EHAge considered Turonian (Late Cretaceous) based on megafossil occurencesGGO006H321I Goodnews BayJ SedimentaryK1985€*AKkcdB=Kuskokwim Group; Chert-clast provenance rocks; Deltaic faciesCLate Cretaceous (Turonian)DXThick bedded quartzose sandstone, pebbly sandstone, and subordinate siltstone and shale.EHAge considered Turonian (Late Cretaceous) based on megafossil occurencesGBH002H1971IBethelJ SedimentaryK1985€+AKkbcB#Kuskokwim Group; Basal ConglomerateCLate Cretaceous (Cenomanian(?))DwPebble to boulder conglomerate, coarse sandstone, and minor interbedded medium-grained sandstone, siltstone, and shale.GBH002H1976IBethelJ SedimentaryK1985€,AKksB7Kuskokwim Group, sedimentary rocks, conglomerate faciesCHmiddle Late (Cenomaniam and Coniacian) to late Early Cretaceous (Albian) 0Kkuskokwimgroupchert-clastprovenancerocksdeltaicfacies)V*V2lhoareXWYWWW WhornblendeWhornblendedioritestocksanddikesVhylobasaniticWWhylobasaniticflowsotterislandWVhypabyssalWWhypabyssalfelsicintrusiverocksWVigneousWigneousrocksofnayorurunriverareaVinnerdWgWhWiWinner-fan-channel$Winterbedded:WrWWWWintercalatedWintermediateLWMWintermediateandsilicicpyroclasticdepositsLVMVWIWJWKWkipchukvolcanicfieldandesiteandbasaltflowsEVkipchukvolcanicfieldandesiteflowsFVkipchukvolcanicfieldbasalandesiteflowsGVkipchukvolcanicfieldfine-grainedtuffcrystal-vitrictuffIVkipchukvolcanicfieldlowerblackandesitelithictuffKVkipchukvolcanicfieldrhyolitedomesandflows>VkipchukvolcanicfieldupperblackandesitelithictuffJVkuskokwim!W"W#W$W%W&W'W)W*W+W,Wkuskokwimgroup!Vkuskokwimgroupbasalconglomerate+VpebblesWWXWYW\WtWuWvWLW7WpebblyFW$W)W*W2W3WWWWpebbyrWpegmatitic}W~WWWWWWpeirceWpelecypodskWlWpeliticWpenetrativekWlWpercentBWCWDWWWWWWperidotiteLWsW~Wperidotiteformsbasementofislandmassiveoriginallywasa~VpermafrosttWuWvWpermianWWWWWWWWWWWWWpervasivemWnWoWpervasivelyNWmWnWoWpervasivelydeformedanddismemberedtuffaceoussandstone-shmVnVoVpetrotectonicWphacoidsWWphaseWphasesWphenocrystsmWnWoWpWwWWWBWCWDWWWWphyllitewWWWWWWphyllitesWWphyllitic2W3WWphyricWWpillowTWUWVWXWqWsWtWuWvWxWyWzW{WWWWWWWWWWWWWWWWWWn)W2W?H€,A%Chiefly consists of conglomerate facies of interbedded graywacke and siltstone, with lesser amounts of pebble grit conglomerate and and a small amount of coal. Well-indurated, commonly light- to dark-gray and weather brown. Varies from volcanic wacke to quartz-chert-feldspar-rich sandstone.%EFossils collected from basal zone are considered late Early Cretaceous (Albian) age and fossils from the upper zone considered early and middle Late Cretaceous (Cenomaniam and Coniacian)GBH004H31970IBethelJ SedimentaryK1985€-AKsBGraywacke-siltstone sequenceCLate Cretaceous(?)DkVolcanic graywacke, siltstone, and minor amounts of pebble conglomerate and coal; probably littoral marine.GBI002H9I Baird InletJ SedimentaryK2021€.AKsBGraywacke-siltstone sequenceCLate Cretaceous(?)DkVolcanic graywacke, siltstone, and minor amounts of pebble conglomerate and coal; probably littoral marine.GNI002H9INunivak IslandJ SedimentaryK2021€/AKs?BGraywacke-siltstone sequence+ xlate,W-W.W/W=W>WAWBWCWDWEWFWGWHWIWJWKWLWMWNWRWSWXW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWpWwWWWWWWWWWWWWWWWWWWlateandmiddlejurassic[VaVbVcVdVeVfVgVhViVjVcenomanian&W+Wconiacian'W,WcretaceoustWuWvWwWyWzW{WWWWWWWW W W W W WWWWWWWWWWWWWW W!"W#W$W%W&W'W)W*W+W,W-W.W/W01W2W3W45W6W7W8W9W:W=W>WAWBWCWDWEWFWGWHWIWJWKWLWMWNWPWRWSWTWUWVWWWXWYWvW{WWWWWWWWWWWWdevonianWWWWWWWdevoniantoordovicianVVVVearlyZWtWuWwWyWzWW WWWWW&W'W,W1W2W3W5W6W7W8W9W:W?W@WAWPWRWSWTWUWVWWWXWYW]W^W_W`WmWnWoWpWqWrWsWtWuWvWwW{WWWWWWWWWWWWWWWWWWWWWWWWWWWgturonian"W#W$W%W&W)W*WupperWWuppertriassicVV0.2W0.3WW0.6HW0.7kWlW1W W WWW WRWkWlW1.0-m-wideWW1.5WW1.7kWlW1/2WW10aWbWcWWWWW100XWYW1000WWWW12W14wW1500WW159WW174kWlW183W186WW187WW1938WW1955}W1970WWWWW1973aWbWcWdWeWfWgWhWiWjWkWlW1975]W^W_W`WpW1976WW1978W WWW)W2WuWWWWWW1978aXWYWWWW WkWlWW1978bW1980XWYW19836W1984BWCWDW1985 WjWpWuWvW{WWWWW1993)W2WW2BWCWDWHWPWYWW2-56WBWCWDWW WBWCWDWacrossWWW WaddedcWadjacentbWtWuWBWCWcenomanian&W'WchertWWWchertsxWyWzWclastsmWnWoWcollected'W,WWWWWWcollection2W3WwWWcollections"WcommonlyWWWcomplexmWnWoWconiacian'W,WconodontWconodontcollectionofmiddletriassicandlatedevoniantoVconodontsWWWconsidered"W#W%W'W)W*W,WWWconsidereduppertriassicbasedonradiolarianagesofassocVVVWvW{WWWdeformationmWnWoWdepositionmWnWoWdepositstWuWvWearly!W&W'W(W,W1W2W3W5W7W8W9W:W;W<WQWRWTWUWVW]W^W_W`WmWnWoWpWqWvWwW{Wearlycretaceousalbianageassignedfromfossilsfoundnort!Vearlycretaceouspelecypodsandradiolarians:Vfauna6WXWWWforms$WmWnWoWfossil2W3WmWnWoWWeWfWgWhWiWjWd!WCI€/CLate Cretaceous(?)DkVolcanic graywacke, siltstone, and minor amounts of pebble conglomerate and coal; probably littoral marine.GNI002H10INunivak IslandJ SedimentaryK2021MQ€0AKsBSedimentary rocksC CretaceousDSedimentary rocksGNI003H150INunivak IslandJ SedimentaryK2021€1AKcgBGraywacke and conglomerateCEarly CretaceousDMarine sedimentary unit consisting of hard graywacke, shaly and blocky siltstone, and local conglomerate. Rocks commonly calcareous.E,Buchia of Early Cretaceous (Valanginian age)GGO002H125I Goodnews BayJ SedimentaryK2102€2AKtsBATurbidite sandstone, conglomerate, and phyllite, Goodnews terraneCEarly CretaceousDSandstone, sandy conglomerate, pebbly mudstone, siltstone, and shale with phyllitic fabric. Reassigned polygon from Hoare and Coonrad (1978) to match unit from Box and others (1993) to north.E_Pelecypod fossil collection of Valanginian, and of Late Jurassic and (or) Early Cretaceous, ageGGO006H325I Goodnews BayJ SedimentaryK2102€3AKtsHL€3BATurbidite sandstone, conglomerate, and phyllite, Goodnews terraneCEarly CretaceousD[Sandstone, sandy conglomerate, pebbly mudstone, siltstone, and shale with phyllitic fabric.E_Pelecypod fossil collection of Valanginian, and of Late Jurassic and (or) Early Cretaceous, ageGBH002H2116IBethelJ SedimentaryK2102€4AKvB Volcanic graywacke and argilliteC CretaceousDhThinly interbedded fine-grained graywacke and siliceous argillite thermally altered by granodiorite (Tg)GST002H1301I Saint MatthewJ SedimentaryK2105MHFS€5AKbBGraywacke of Buchia RidgeCEarly CretaceousDMarine sedimentary rocks of graywacke, siltstone, and conglomerate. Conglomerate, near the top of Buchia Ridge, contains local Buchia shell coquinas.EeBuchia and other "Fossils" show that it is Early Cretaceous in age (Valanginian and Hauterivian ages)GGO002H122I Goodnews BayJ SedimentaryK2125€6AKlbB+Lower Cretaceous graywacke of Buchia Ridge CEarly Cretaceous|T€3BI€6AL€7DP€:BR€=@UBW€ABY€BBZ€CA]C^€DBd€EFh€I@j€LAk€MFo€PAr€QESSs€TAu€UJx€YBy€\J|€_D}€aAC€bB€cAC€dAC€eAC€fAC€gAC€hAC€iAC€jB€kBBF€lBF€mBA€nBA€oBA€qD€rB€sB€uB€vA€xA€yA€zA€{E€A€A€D€E€A€BI€A€A€F€J€A€A€A€A€CB€A€A€BB€AC €BJ€BJ€BD€I€A C!€B#€D$€qsiltstone-coalWW WsiltstonesFWWWWsiltyWWWWWWsimilar}WWW W6W>WBWCWDWkWlWmWnWoWrWWWWWWWWWWWWWWWWWWWWsimilarityWWWWWsimplemWnWoWsingleuWWWWsitlyWsizeWWWslabWslate"WaWbWcWdWeWfWgWhWiWjWmWnWoWWWslatyWW W6WaWbWcWdWeWfWgWhWiWjWmWnWoWxWyWzWWWWWWWWWslickensidedNWmWnWoWWWWVW|WsomewhatmWnWoWsortedWsoutheast6WsouthernrWsparseTWspeckledWsquareWW W WWWssand^W_WstpWsteeply|WBWCWDWstipple{W}Wstock}Wstock-likexWstocksWWstreamMWOWPWWW Wstream-floodWW WIP-€6ALithic sandstone, conglomerate, and shale at least 2-5 km thick (Hoare and Coonrad, 1983). Clastic rocks composed mostly of slaty volcaniclastic rock fragments, similar to Jurassic rocks to the southeast (Jln, Jmm). No paleocurrent data available. Divisible into lower, coarse clastic member (Klb1) of shallow marine origin, and an upper calcareous black shale member (Klb2) of probable offshore marine origin. Klb1 preserves abundant Valanginian fauna; Klb2 yields rare Hauterivian ammonites. BsProbable basal angular unconformity obscured by later faulting, except north of map area (Hoare and Coonrad, 1983) aESKlb1 preserves abundant Valanginian fauna; Klb2 yields rare Hauterivian ammonites. GGO005H508I Goodnews BayJ SedimentaryK2125€7AKlgBLimy grit and limestoneCEarly Cretaceousc&mottledfWmountain}WmountainsWWmouthOWWWmovespWmtnkWlWWWWWWWmtnsWWWWWmuchWWWmudCWDWEWIWRWSWUWVW]Wmudsiltsandgravelbouldersandintermixedwoodpeatando]VmudrockFWmudstoneWWW2W3WWWWmudstonesrWmuscoviteWmuttiaWbWcWdWeWfWgWhWiWjWkWlWmylonitesWmylonitizationWWWWWWWmylonitizedWmzpzWWWnarrowWWW WWWWWWnayorurunWnearW5WaWbWcWdWeWfWgWhWiWjWrWWWWWWWWWWWnearlymWnWoWnearshoreWWneutralYWnewenhamWWWWnoLWZW6WWnoncoplanarWWWWnoneWnonexistantWnonmarinetWuWvWWWWWW WlprimarilyKWprimarlyLWprobableWW W6WBWCWDWWWWWprobablymWnWtWuWvW@WAWDWWWW W-W.W/WBWCWDWaWbWcWdWeWfWgWhWiWjWWWWWWWWWWWprocessesmWnWoWprominentWWproportionWWWpropyliticallyFWprotolithWWWWWWWprotolithsWWWWWWWWWWproximalkWlWpseudomorphicBWCWDWpseudomorphsWWpumpellyiteWWWWpvsWWWWW2XWYWquadranglebWcWquadranglestWuWquartzmWnWoWpWWWWWWWWW W W W W WWWWWWWW7WPW|WWWWquartz-chert-feldspa'W,Wquartz-feldspar}Wquartz-monzodioritePWquartzose"W)W*WquiteLWradiolariamWnWoWxWyWzWradiolarianWW6ilateralzW{W}WlatestaWbWcWdWeWfWgWhWiWjWxWyWzWlatiteqWlaumontiteqWlaumontitized8W9WlavaWW_W`WaWFWSW[WWWWlavaflowsofhylobasaniteatleaat325feetthickalkalicWVlavasWWlawsoniteWlayerLWlayeringWleaatWWleast6WBWCWDWkWlWleftLWlengthWlessXWYWHWYWWWWWlesserW"W#W'W,W?W@WKWPWleucocraticWlightsWtWuWvWxWWWWW WWW'W,WWWWWWWWlighttodark-graysiltandsandysiltsVlighttomedium-grayfine-grainedporphyriticalbiterhyolitxVlight-coloredjWkWlWrWlight-coloredfine-grainedcommonlyporphyriticfelsicintrujVkVlVlight-grayGWPW|WWWlight-graymedium-grainedintrusivetrondhjemiteconsisting|VVxWyW|W1W5WlocallyOWPWQW^W_WfWgWhWoWtWuWvWKW}WLR€7DLimy grit and limestone. Chiefly small, green, fine-grained angular rock fragments and minor round quartz pebbles cemented by gray bioclastic limestone consisting of tiny shell fragments. Coeval with the conglomeratic rocks of Buchia Ridge (Kb). E,Buchia of Early Cretaceous (Valanginian age)GGO002H123I Goodnews BayJ SedimentaryK2150€8AKtsBTuff and sedimentary rocksCEarly CretaceousDiThick, varied assemblage of andesitic, commonly laumontitized, tuffs, sedimentary rocks, and a few flows.EPBuchia of Early Cretaceous (Valanginian age) Radiolaria of Early Cretaceous ageGGO002H124I Goodnews BayJ SedimentaryK2180€9AKtsBTuff and sedimentary rocksCEarly CretaceousDiThick, varied assemblage of andesitic, commonly laumontitized, tuffs, sedimentary rocks, and a few flows.EPBuchia of Early Cretaceous (Valanginian age) Radiolaria of Early Cretaceous ageGHG002H124IHagemeister IslandJ SedimentaryK2180€:AKvsX2 rocks9W?W@WBWCWDWTWUWVWWWqWrWsWtWuWvWxWyWzW{W}W~WWWWWWWWWWWWWWWWWWWWWWWWWPU>€:BZTogiak Terrane; Marine volcaniclastic sandstone, conglomerate, shale, and interbedded tuffCEarly CretaceousDrThin- to thick-bedded, green tuffaceous sandstone, siltstone, argillite, conglomerate, tuff, and tuffaceous chert.E,Early Cretaceous pelecypods and radiolariansGBH002H2180IBethelJ SedimentaryK2180€;AKCggB3Gemuk Group, graywacke, siltstone, and conglomerateC$Early Cretaceous to Mississippian(?)AGraywacke and conglomerate, massive, fine- to coarse-grained hard, dark-gray; massive and thin-bedded, light- to dark-gray and green lithic-feldspathic graywacke; massive varicolored argillite; banded slaty siltstone; minor amounts of limestone, calcareous graywacke, andesitic volcanic rocks, chert and silicious tuff(?). Graywacke, conglomerate and siltstone very similar to Kuskokwim group. Silty limestone, calcareous graywacke and siltstone more common in Gemuk. (Eastern part of unit iB?s 2830; central is assigned to NSA class 2320 and west to 1970.-vvolcaniclastic:WAWZW[WkWlWmWnWoWsWtWuWWWWWWWWWvolcaniclasticconglomeratesandstoneandshalenyacterrnae[Vvolcanogenic?W@Wwell-beddedeWwithWWWK,tuffandsedimentaryrocks8V9VtuffstgeorgeislandIVtuffaceousIWRWtuffsxWyWzWtulipwWyW=WtulipvolcanicfieldblockandashflowwVtulipvolcanicfielddaciteandandesiteflowsanddacitetuyVtulipvolcanicfieldrhyolitedomesandflows=Vturbidite"W#W2W3Wturbiditesandstoneconglomerateandphyllitegoodnewsterra2V3VturbiditesaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWultramaficWWWWWWultramaficrocksVVWWW WWW WBWCWDWJWaWbWcWdWeWfWgWhWiWuppercretaceousgraniticplutonsVVV VuppercretaceousnonmarineclasticrockssummitislandformaVV VuppercretaceousvolcanicrocksBVCVDVvalleyPWQWvolcanic_W`WaWpWqWtWuWvWwWyWzW{W|W%W4W=W>W?W@WBWCWDWEWFWGWHWIWJWKWTWUWVWRW €=AKtrgB3Gemuk Group, graywacke, siltstone, and conglomerateC!Early Cretaceous to Late JurassicAGraywacke and conglomerate, massive, fine- to coarse-grained hard, dark-gray; massive and thin-bedded, light- to dark-gray and green lithic-feldspathic graywacke; massive varicolored argillite; banded slaty siltstone; minor amounts of limestone, calcareous graywacke, andesitic volcanic rocks, chert and silicious tuff(?). Graywacke, conglomerate and siltstone very similar to Kuskokwim group. Silty limestone, calcareous graywacke and siltstone more common in Gemuk. (Applies to eastern parBBt of unit; central is assigned to NSA class 2180 and west to 1970.0EiFossils of early Cretaceous (Valanginian) and Late Jurassic age collected at widely scattered localities.GBH004H32831IBethelJ SedimentaryK2180€=AKtrsils of early Cretaceous (Valanginian) and Late Jurassic age collected at widely scattered localities.GBH004H32831IBethelJ SedimentaryK2180€=AKtr_earlycretaceous1V2V3V5V6V7V8V9V:VPVearlycretaceousandorlatejurassicRVSVXVearlycretaceoustoearlyordovicianVVVearlycretaceoustolatejurassicVVVearlycretaceoustomiddlejurassicTVUVVVvV{VearlycretaceoustomississippianVVVearlyjurassicmVnVoVqVrVearlyjurassicandlatetriassicwVearlyjurassiclatetriassicVVVVVearlyjurassic-latetriassicsVtVuVVVearlymississippianandorlatedevonianVVearlyproterozoicVVVVWholoceneFWRWSWTWUWVW12wWxWyW|WNWOWRWSW[W\W]W^WbWcWdWeWholoceneandpleistoceneFVwVxVyV|Vjurassic<WQWRWSWTWUWVWWWXWYWZ[W\]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWvWwWxyz{W|W}W~WWWWWUY€=B.Tulip Volcanic Field; Rhyolite domes and flowsCLate CretaceousDXRhyolite domes and flows found as small knobs or hills. Moderately to severely altered.GBH002H2210IBethelJIgneousK2210€>AKvkrB0Kipchuk Volcanic Field; Rhyolite domes and flowsCLate CretaceousDModerately to severely altered, white to orange, platy rhyolite domes and flows, and minor rhyolite breccia. Lithologically similar to Ktr.GBH002H2265IBethelJIgneousK2210MALT€?ATvB(Volcanic rocks and volcanogenic depositsCEarly TertiaryDMostly andesitic and trachytic tuffs, breccias, and flows. Lesser basaltic andesite and diabase and fine- to medium-grained volcanogenic sedimentsGHG002H115IHagemeister IslandJIgneousK2260€@ATvB(Volcanic rocks and volcanogenic depositsCEarly TertiaryDMostly andesitic and trachytic tuffs, breccias, and flows. Lesser basaltic andesite and diabase and fine- to medium-grained volcanogenic sedimentsGNG002H115I Nushagak BayJIgneousK2260€AATKmQrhyoliteanddacitetuffrVridge5W6Wridges@WriverPWQWW WWWWrocks_W`WaWjWkWlW|W}WWWWWW WWWWWWWWWWWW W"W#W$W%W'W)W*W,W0W8WWZ€AB'Mafic flows and volcaniclastic depositsC!Early Tertiary to Late CretaceousDFlat-lying to gently dipping mafic flows of andesite and basalt, and volcaniclastic deposits of andesitic and basaltic tuff and conglomerateFKK/Ar age of 78.7 +/- 2 and 66.4+/- 2 m.y. from whole rock samples of basaltGST002H201I Saint MatthewJ SedimentaryK2260€BAKuvB Upper Cretaceous volcanic rocks CLate Cretaceous AModerately to steeply dipping, fresh to weakly altered porphyritic andesite flows and interbedded sandy to bouldery volcaniclastic rocks. Phenocrysts are plagioclase, clinopyroxene, orthopyroxene, pseudomorphic talc after olivine, and accessory magnetite. Mostly basaltic andesites of calc-alkaline affinity (Globerman and others, 1984). Associated dikes cut underlying units. Four whole-rock K-Ar determinations yield Late Cretaceous ages. Depositionally overlies Upper Cretaceous Summit IslanY]5€BBd Formation on Summit Island and adjacent mainland. On Hagemeister Island, consists of at least 2 km of thick (2-5 m) subaerial flows with very minor fluvial sandstone interbeds. On Crooked Island, consists of similar flows with more voluminous (25 percent) interbedded epiclastic volcanic sandstones and coarse boulder conglomerates. On coast northwest of Right Hand Point consists almost entirely of bouldery volcaniclastic sediments of probable debris flow origin, with very minor flows. On CRound Island, rocks are indurated by thermal metamorphism from adjacent pluton. Unit probably congenetic with Tkg intrusive bodies. dF?Four whole-rock K-Ar determinations yield Late Cretaceous ages.GGO005H504I Goodnews BayJIgneousK2260€CAKuvB Upper Cretaceous volcanic rocks CLate Cretaceous ~`andesitic|W8W9W?W@WAWHWSWTWUWVW[WvW{WWWWWWWWWWWWandesiticandbasalticlavaflowsflowbrecciasandtuffaceoVangular6W7WrWsWtWuWWWWapartWWWaphaniticmWnWoWsWtWuWWWaplitesWWWaplitegranitedikeintrudingperidotitesurfaceweatheredbsVapliticWapparentWWWWapparentlyWWWWappearanceaWbWcWdWeWfWgWhWiWjWrWappears~WWWappliesWWWrightBWCWDWaWbWcWdWeWfWgWhWiWjWrimmedWrims WriverPWQWqWWWkWlWWWWWWWWrivers^W_WrockFWXWYW6W7WPWWWWWrockispale-pinkweatheringlight-graycoarse-grainedporphPVrocksNWOWRWSW[W\W]W^WbWcWdWeWfWjWkWlWrWyW|W}WWWWWWW W WWWWWWWWWW W%W0W1W5W6W7W8W9WBWCWDWKWTWUWVWkWlWqWrWsWtWuWvW{W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWrodingitizedWWrollingWWWWZ^€CAModerately to steeply dipping, fresh to weakly altered porphyritic andesite flows and interbedded sandy to bouldery volcaniclastic rocks. Phenocrysts are plagioclase, clinopyroxene, orthopyroxene, pseudomorphic talc after olivine, and accessory magnetite. Mostly basaltic andesites of calc-alkaline affinity (Globerman and others, 1984). Associated dikes cut underlying units. Four whole-rock K-Ar determinations yield Late Cretaceous ages. Depositionally overlies Upper Cretaceous Summit IslanBd Formation on Summit Island and adjacent mainland. On Hagemeister Island, consists of at least 2 km of thick (2-5 m) subaerial flows with very minor fluvial sandstone interbeds. On Crooked Island, consists of similar flows with more voluminous (25 percent) interbedded epiclastic volcanic sandstones and coarse boulder conglomerates. On coast northwest of Right Hand Point consists almost entirely of bouldery volcaniclastic sediments of probable debris flow origin, with very minor flows. On ]d;€CCRound Island, rocks are indurated by thermal metamorphism from adjacent pluton. Unit probably congenetic with Tkg intrusive bodies. dF?Four whole-rock K-Ar determinations yield Late Cretaceous ages.GHG003H504IHagemeister IslandJIgneousK2260€DAKuvB Upper Cretaceous volcanic rocks CLate Cretaceous AModerately to steeply dipping, fresh to weakly altered porphyritic andesite flows and interbedded sandy to bouldery volcaniclastic rocks. Phenocrysts are plagioclase, clinopyroxene, orthopyroxene, pseudomorphic talc after olivine, and accessory magnetite. Mostly basaltic andesites of calc-alkaline affinity (Globerman and others, 1984). Associated dikes cut underlying units. Four whole-rock K-Ar determinations yield Late Cretaceous ages. Depositionally overlies Upper Cretaceous Summit IslantogiakPWQWWWW WkWlWsWtWuWtonaliteYWWtonalite-monzoniteWtoolkWlWtop5WaWbWcWdWeWfWgWhWiWjWWWtopographicfWgWhWoW@WtopsXWYWtraceWW WtrachyandesiteWWtrachyteWWtrachytic?W@WTWUWVWvW{WWtransitional^W_WaWbWcWfWgWhWoWWWWWWWWtriassicsWtWuWWWWWWWWWWWWtrondhjemite|WWWWWtrondhjemiticWtrondnjemiteWtrubWWWWWWWtrudWWWWWtrugWWWWtrutWWWWWWite-faciesarkosicsandstoneandshale\Vturbidite-faciesvolcaniclasticstratalocallyascoarseasZVturbiditesaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWturbiditymWnWoWtuyaXWYWtwoWWW WmWnWoWRplainaWbWcWWW WplainsaWbWcWEWplanaraWbWcWdWeWfWgWhWiWjWmWnWoWWWplanesaWbWcWdWeWfWgWhWiWjWkWlWplantWWWplatinumWWplaty>WGWpleistoceneKWLWpleistocenesedimentssomefossiliferouspolymicticbutcompKVplugsLWMWplutonW WWWWBWCWDWYWrWWWWWplutonicWWWWWW W WWW%WaWbWcWdWeWfWgWhWiWjWWWWWWplutonssWtWuWWWWWpointBWCWDWWWpolarityNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWpolarizedNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWpolished~Wpolygon)W2WjW0?assumedJWKWLWasymmetrymWnWoWWWWWDWPWkWlWaugiteXWYW WWWaugite-biotite WWaugite-biotite-hornb Wavailable6WavalanchewWaxesaWbWcWdWeWfWgWhWiWjWkWlWaxialaWbWcWdWeWfWgWhWiWjWkWlWbkWlWbajocianaWbWcWdWeWfWgWhWiWjWkWlWmWnWbanded(W;W<WQWbandingGWbarBWbasalLW6WbasaltLWNWOWPWRWSWTWUWVWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWqW{W|WWWWAWEWFWXWbasaltlavaflowsandcindercones_V`VaVbasaltflowsQWbasalticGWJWKWUWVW?W@WAWBWCWDWSW[WbasalticandandesiticlavaflowsSVbasalticflowsandsillsflowsrangeinthicknessfrom20cmUVVVbasaltsTWUWVWbasaniteVWbasaticsWbaseaWbWcWdWeWfWgWhWiWjWEundifferentiatedBWCWDWEWIWRWSWUWVWundifferentiatedbeachbaralluvialandcolluvialdepositsmBVundifferentiatedfluvialandmarinegravelsandsiltandmudCVDVEVIVRVSVUVVVundivided^W_WfWgWhWoWWWunfoliatedWW WWWWWWWWunitWXWYWzWW WWW1W2WBWCWDWTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWuWvWxWyW{WWWWWWWWWWWWWWWWWWWWWWWWunitaddedbyextensionofpolygonfrombox1985descriptionjVunitasdescribedbybox1985shownashornfelsandunitjlvuVuVuVshedonlyneargoodnewsbaycharacterizedbyrVVunitsJWKWLWWWW WWBWCWDWaWbWcWdWeWfWgWhWiWjWWWWWWWWWuWWWWWWMmostpW@WAWDWWWmostprobablyassociatedwithlatewisconsineventsAVDVmostlyBWpWWW W6W?W@WBWCWDWkWlWsWtWuWWWWWWWmostlyandesiticandtrachytictuffsbrecciasandflowsless?V@V@V@V^h€DBd Formation on Summit Island and adjacent mainland. On Hagemeister Island, consists of at least 2 km of thick (2-5 m) subaerial flows with very minor fluvial sandstone interbeds. On Crooked Island, consists of similar flows with more voluminous (25 percent) interbedded epiclastic volcanic sandstones and coarse boulder conglomerates. On coast northwest of Right Hand Point consists almost entirely of bouldery volcaniclastic sediments of probable debris flow origin, with very minor flows. On CRound Island, rocks are indurated by thermal metamorphism from adjacent pluton. Unit probably congenetic with Tkg intrusive bodies. dF?Four whole-rock K-Ar determinations yield Late Cretaceous ages.GNG006H504I Nushagak BayJIgneousK2260€EAKvk6B1Kipchuk Volcanic Field; Andesite and Basalt flowsCLate Cretaceous (Maastrichtian)DPorphyritic plagioclase-pyroxene-olivine andesite flows and flow breccias, minor interbedded flows of olivine basalt, and black andesite tuff.3yields6WWWyoungerWzoneWWWWWzonedPWzonesWWW WWWWWW1938W1978akWlWaWW WWabundant6WabundantlyrWadjacentmWnWoWageFWLWWW W!W"W#W%W&W'W)W*W,W1W2W3W5W7W8W9WRWTWUWVW[W]W^W_W`WkWlWmWnWoWpWqWvWwWxWyWzW{WWWWWWWWWWWWWWWWWWWageconsideredturonianlatecretaceousbasedonmegafossil%V)V*Vageconsideredturonianlatecretaceousbasedonthreemegaf"VwadjacentDWaWbWcWdWeWfWgWhWiWjWmWnWoWWWWWWWWF20UWVW200WW WPW2180WW22PW2320WWW25WBWCWDWWW2830WWW325WW4vW4-cmRW40W400WW W50aWbWcWW500vWW6aWbWcWdWeWfWgWhWiWjW600WW W7UWVW8kWlWaaWbWcWmWnWEWLWXWYWwW|W}W~WWWWW WWWWWWW W'W,W8W9WOW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWrWWWWWWWathickmarinesedimentaryunitreferredtoaswearygraywac]V^V_V`VaboutXWYWWaboveaWbWcWabundanceWW WabundanttWuWvWmWnWoWWWW6WKWTWUWVWvW{W|WabundantsillsanddikescuttingkusandjlninvicinityofmVnVoVabundantlyrWaccessoryXWYWmWnWoWWWW WBWCWDWacrossWWW Wdj€EF2Ar/Ar total-fusion age of 69.5+2.1 Ma from biotiteGBH002H2271IBethelJIgneousK2260€FAKvk3B&Kipchuk Volcanic Field; Andesite flowsCLate CretaceousDPorphyritic, propylitically altered, one- and two-pyroxene andesite lava flows. Minor olivine basalt flows, dacite flows, and andesite tuff.GBH002H2274IBethelJIgneousK2260€GAKvk1B,Kipchuk Volcanic Field; Basal Andesite flowsCLate CretaceousD~Light-gray to tan, sugary textured, fine-grained andesite flows with well-developed flow banding and irregular platy fracture.GBH002H2276IBethelJIgneousK2260€HAKslB0Swift Creek Volcanic Field; Lithic air-fall tuffCLate Cretaceous (Campanian)DModerately altered, andesitic lithic air-fall tuffs, tuff breccias, and altered andesite flows. Varies from coarse-grained lithic tuff breccia with clasts as large as 2 m in diameter to ash beds containing lithic fragments less than 0.6 cm in diameter.F1Whole rock Ar /Ar total-fusion age of 74.3+2.2 MaGBH002H2270IBethelJIgneousK2261O5light-graytotansugarytexturedfine-grainedandesiteflowGVlight-graytowhitecalciticanddolomiticmarblecutbypreVlimbsaWbWcWdWeWfWgWhWiWjWlimestone7WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlimestonemappedspeparatelyinmassivelybeddedgreenamphiVlimestonesWlimeyWWWWlimeyWWWWWWWWWWWandshaleatleast2-5kmthic6Vlithic-feldspathic(W;W<WQWWlithologically>WlithologywWlittleZWlittoral-W.W/WlobeaWbWcWdWeWfWgWhWiWjWlocalwWxWyW|W1W5W]W^W_W`WpWsWtWuWWWlocallyOWPWQW^W_WfWgWhWoWtWuWvWKW}WZW`WrW}W~WWWWWWWWWWWWWWWWhk€IAKvk5BXKipchuk Volcanic Field; Fine-grained tuff, crystal-vitric tuff, and tuffaceous sandstoneCLate Cretaceous (Maestrichtian)DLacustrine, fluvial, and air-fall tuff. Very fine- to fine-grained tuffs that are finely laminated. Air-fall tuff is fine- to medium-grained with well developed bedding.GBH002H2272IBethelJIgneousK2261€JAKvk4B8Kipchuk Volcanic Field; Upper black Andesite lithic tuffCLate Cretaceous (Maastrichtian)DDBlack, densely welded andesite tuff exposed in low hills and ridges.F3Whole rock K/Ar ages of 69.0+2.1 Ma and 71.4+2.1 MaGBH002H2273IBethelJIgneousK2261€KAKvk2B8Kipchuk Volcanic Field; Lower black Andesite lithic tuffCLate CretaceousDMassive, dark, fine-grained tuff having black opaque vitroclastic groundmass and abundant lithic fragments of volcanic rocks and lesser sandstone and shale.GBH002H2275IBethelJIgneousK2261€LAKiB-Intermediate and silicic pyroclastic depositsCLate Cretaceousjo€LACIntermediate and silicic pyroclastic deposits including: dacite, andesite, and rhyolite nonwelded tuff breccia and crystal tuff, dacite and rhyolite welded tuff, massive dacite breccia (lahar?), fine ash-fall tuff, volcanic conglomerate, and andesite and dacite porphyritic and vitrophyritic plugs, dikes, sills, and flows.CE*Pollen assemblages from carbonaceous tuffsFEK/Ar age of 74.1 +/- 2 and 74.4+/- 2 m.y. from biotite and hornblendeGST002H302I Saint MatthewJIgneousK2265€MAKiB-Intermediate and silicic pyroclastic depositsCLate CretaceousAZIntermediate and silicic pyroclastic deposits including: dacite, andesite, and rhyolite nonwelded tuff breccia and crystal tuff, dacite and rhyolite welded tuff, massive dacite breccia (lahar?), fine ash-fall tuff, volcanic conglomerate, and andesite and dacite porphyritic and vitrophyritic plugs, dikes, sills, and flows. Contact metamorphosedZE*Pollen assemblages from carbonaceous tuffsA KintrusivejWkWlWWWWWWWislandpWGWHWIWJWKWLWMWUWVWWWsW~WWWWWW WjurassicaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWrWsWtWuWxWyWzWWWWWWWWWWWWWWWassociatedrocksxVyVzVkaronNWOWbWcWdWeWkipchuk W>WEWFWGWIWJWKWkipchukvolcanicfieldandesiteandbasaltflowsEVkipchukvolcanicfieldandesiteflowsFVkipchukvolcanicfieldbasalandesiteflowsGVkipchukvolcanicfieldfine-grainedtuffcrystal-vitrictuffIVkipchukvolcanicfieldlowerblackandesitelithictuffKVkipchukvolcanicfieldrhyolitedomesandflows>VkipchukvolcanicfieldupperblackandesitelithictuffJVkulukak]W^W_W`WpWkuskokwim!W"W#W$W%W&W'W)W*W+W,WWWkuskokwimgroup!Vkuskokwimgroupbasalconglomerate+V6Y1fluvialCWDWEWIWRWSWUWVWtWuWvWBWCWDWIWWWfogqWfoldmWnWoWfolded|WaWbWcWdWeWfWgWhWiWjWkWlWxWyWzWWWWWWfoldingrWWWfoldsaWbWcWdWeWfWgWhWiWjWkWlWWWWWWfoliatedWWWWWWfoliationWWWWWforWWformationBWCWDWformedpWwWWWformingOWformsxW~WmWnWoWfossilLWmWnWoWfossiliferousKWLWrWWWWWWfossiliferoussedimentsconsistingofsandandyellowtuffcLVfossilsaWbWcWdWeWfWgWhWiWjWfoundvW=WWfourBWCWDWaWbWcWdWeWfWgWhWiWjWtureGWWWWWfracturedWWWfracturesqWfragmentaryWWfragmentstWuWvWWW W6W7WHWKWWWfreshtWBWCWDWN=intermediateandsilicicpyroclasticdepositsincludingdaciLVMVintermixed]WinterpillowWWinterpretationfWgWhWoW@WinterpretedwWkWlWinterstitialTWintertonguingWWWintervalsWW WintoXWYWWW W6WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWvW{WWWWWWWWWWWWWWintrudeWWW WWWintruded WkWlWrWWWWWintrudes WWintrudingsWWWintrusion WintrusionsWintrusivejWkWlWWWBWCWDWOW|W}W~WWWWWWWWWWWintrusive-extrusiveWintrusive-extrusivecomplexconsistingofdikessillsandreVironTWWkr€MFEK/Ar age of 74.1 +/- 2 and 74.4+/- 2 m.y. from biotite and hornblendeGST002H1302I Saint MatthewJIgneousK2265MHFS€NAKspB SerpentiniteCLate CretaceousDSmall, pervasively slickensided bodies of serpentinite, serpentinite-matrix melange, and silica-carbonate altered serpentinite.GBH002H2510IBethelJIgneousK2510€OAsB SerpentineC Tertiary(?)DoFibrous pale-green and massive black serpentine forming a small intrusive body north of mouth of Crooked Creek.GBH004H32510IBethelJIgneousK2510€PAKincB:Nyac, Bonanza Creek, and Columbia Creek plutons, undividedCEarly CretaceousARock is pale-pink weathering light-gray, coarse-grained porphyritic to seriate hornblende-biotite and biotite-hornblende granite, quartz monzonite, and lesser granodiorite and quartz-monzodiorite. Nyac (~200 km) is crudely concentrically zoned from hornblende-biotite granodiorite and granite at margin to hornblende-biotite granite at core. Bonanza Creek (~2 km) Columbia Creek (~22 km). saintmatthewAVBVrVVV4VAVLVMV igneousGHIJMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ =>?@BCDEFGHIJKLMNOPWYrstuxyz|}~‚ÂĂƂmetamorphicwǂȂ̂͂΂KslightlyaWbWcWWWWslipaWbWcWdWeWfWgWhWiWjWslumpaWbWcWdWeWfWgWhWiWjWkWlWsmallQWWWXWYW\WWvWxWzW{W|WW W WW'W,W7W=WNWOWWWsmall1kmsquaremediumtocoarse-grainedintergranularto Vsmall1kmsquarequartzmonzodioriteintrusioninkkcdofk VsmallextensivelyalteredhornblendedioritestocksanddikeVsmallintrusionsofabout1kmsquarehornblende-biotitegraVsmallmasseslessthan6kmsquareofmedium-grainedhypidioVsmalloutcropsandcolumnarjointedandesiteflowssubordina{VsmallpervasivelyslickensidedbodiesofserpentiniteserpenNVsoftFWsomeZW[WtWuWvWEWKWUWVW|WqWWWWWWWWWsomewhatmWnWoWsortedWsourceWWWWsourcesaWbWcWdWeWfWgWhWiWjWsouthWWWWWWWdWW Wos:€PANyac: K/Ar age of 101.1+3.0 Ma from hornblende; 108.5+3.3 Maand 120.0+3.6 Ma from biotite; and U/Pb age of 104 to 129 Ma from zircon. Bonanza Creek: Ar/Ar total-fusion age of 110+3.3 Ma from biotite. Columbia Creek: K/Ar age of 115.0+3.5 Ma from biotite.GBH002H2530IBethelJIgneousK2530€QAKCggB3Gemuk Group, graywacke, siltstone, and conglomerateC!Early Cretaceous to Late JurassicAGraywacke and conglomerate, massive, fine- to coarse-grained hard, dark-gray; massive and thin-bedded, light- to dark-gray and green lithic-feldspathic graywacke; massive varicolored argillite; banded slaty siltstone; minor amounts of limestone, calcareous graywacke, andesitic volcanic rocks, chert and silicious tuff(?). Graywacke, conglomerate and siltstone very similar to Kuskokwim group. Silty limestone, calcareous graywacke and siltstone more common in Gemuk. (Applies to eastern parBBt of unit; central is assigned to NSA class 2320 and west to 1970.0rua€RAKJcB.Togiak Terrane; Argillite and tuffaceous chertC'Early Cretaceous and (or) Late JurassicDThin-bedded green to brown argillite with occasional 1- to 4-cm thick tuffaceous chert, siltstone, and fine-grained tuff interbeds.ENLate Jurassic and (or) Early Cretaceous age from poorly preserved radiolariansGBH002H2810IBethelJ SedimentaryK2832€SAKJbaB/Basaltic and Andesitic lava flows, Nyac terraneC'Early Cretaceous and (or) Late JurassicD"Basaltic and andesitic lava flows.GBH002H2871IBethelJ SedimentaryK2870€TAKJvsBVolcanic and sedimentary rocksC#Early Cretaceous to Middle Jurassicaltic and andesitic lava flows.GBH002H2871IBethelJ SedimentaryK2870€TAKJvsBVolcanic and sedimentary rocksC#Early Cretaceous to Middle JurassiclchannelizedWW WkWlWchaotickWlWcharacteristicWWcharacterizedmWnWoWxWyWWWWWWWchemicalWchert:WRWXWaWbWcWdWeWfWgWhWiWjWmWnWoWwWWWWWWWWWWWWWWWWWWWWWWW WWW'W,W7WWchieflyblackporphyriticolivinebasaltincludessomeandes|Vchieflyconsistofinterbeddedgraywackesiltstonewithless'Vchieflyconsistsofconglomeratefaciesofinterbeddedgrayw,Vchieflyfrost-rivedrubblebutlocallyincludessmallamountQVchieflyfrost-rivedrubblelocallyincludesstreamalluviumOVPVchieflyfrost-rivedrubbleloccallyincludesstreamalluviumMVchieflylighttodark-graysiltandsandysiltcontainingabvVchieflyreworkedsiltsandysiltandbogdepositsunderlyingaVcVchieflyrhyoliteanddaciteweldedtuffandtuffbrecciaandrVsx€TA8Thick marine unit consisting of volcanic and sedimentary rocks. Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias. Interbedded with the volcanic rocks are tuffaceous siltstone, tuffaceous cherts, and massive thin-bedded argillite.8E_Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.GGO002H127I Goodnews BayJ SedimentaryK2872€UAKJvsBVolcanic and sedimentary rocksC#Early Cretaceous to Middle JurassicA8Thick marine unit consisting of volcanic and sedimentary rocks. Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias. Interbedded with the volcanic rocks are tuffaceous siltstone, tuffaceous cherts, and massive thin-bedded argillite.8E_Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.GHG002H127IHagemeister IslandSvolcanicandsedimentaryrocksTVUVVVqVvVVVVvolcanicandsedimentaryrockssubdivided{Vvolcanicgraywackeandargillite4Vvolcanicrocks|VVvolcanicrocksandvolcanogenicdeposits?V@VfragmentaryTWUWVWvW{WWWfragments]W^W_W`WpWWWfrom!W'W,WLWMWRW]W^W_W`WaWbWcWdWeWfWgWhWiWjWmWnWoWpWWWWuy€UJ SedimentaryK2872€VAKJvsBVolcanic and sedimentary rocksC#Early Cretaceous to Middle JurassicA8Thick marine unit consisting of volcanic and sedimentary rocks. Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias. Interbedded with the volcanic rocks are tuffaceous siltstone, tuffaceous cherts, and massive thin-bedded argillite.8E_Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.GBH003H127IBethelJ SedimentaryK2872€WATJihB!Hypabyssal felsic intrusive rocksC,Early Tertiary (?), Cretaceous, and JurassicD.Highly altered rhyolite and dacite porphyries.GBH002H2885IBethelJIgneousK2885€XAKJbBTogiak Terrane; Pillow basaltC'Early Cretaceous and (or) Late JurassicD_Very altered pillow basalt sequence. Interbedded with argillite and thin-bedded chert of KJc.E$Radiolarian fauna in interbedded KJcGBH002H2890IBethelJ SedimentaryK2890€YATJisx|€YBSlate Creek plutonC,Early Tertiary (?), Cretaceous, and JurassicDErosionally neutral, medium-grained hypidiomorphic-granular, mafic hornblende tonalite and granodiorite pluton, less than 2 km (square).GBH002H2905IBethelJIgneousK2900€ZAJvsBLTogiak Terrane; Marine volcaniclastic sandstone, conglomerate, and argilliteCJurassicD]Turbidite-facies volcaniclastic strata, locally as coarse as fine-grained pebble conglomerateGBH002H3121IBethelJ SedimentaryK3005€[AJvcB?Volcaniclastic conglomerate, sandstone, and shale, Nyac terrnaeCLate and Middle JurassicDEpiclastic sequence of tuffaceous marine sandstone, shale, and conglomerate with minor interbedded basaltic and andesitic lava flowsEhMarine pelecypods of Bajocian age (Middle Jurassic); Marine pelecypods of Tithonian age (Late Jurassic)GBH002H3120IBethelJ SedimentaryK3120€\AJaB6Togiak Terrane; Marine arkosic sandstone and argilliteCJurassicD,Turbidite-facies arkosic sandstone and shaleGBH002H3130IBethel'ice-contactWichWidentifiableWidentifiedmWnWoWxWyWzWigneouskWlWWWWWWWWimagefWgWhWoWimpressivepWinpWtWuWvWBWCWUWVWmWnWoWqWrWvWwW}WWWW WWWWW W$WHWJWTWUWVWaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWvW{WWWWWWWWWWWWWWWWWWWWWWWWWWWWinchesWWandesiteqWyWzW{WEWFWGWJWKWandesiticSWWandesiticandbasalticlavaflowsandmarineepiclasticrockVaniakWaniaklakeplutonVaplitesWaplitestgeorgeislandsVareaWargillaceousWWargillite4WRWZW\WWWarkosic\WWarkosicsandstoneandslategoodnewsterraneVashwWash-flowtWassociatedxWyWzWbasal+WGWy}_€\J SedimentaryK3130€]AJkBGraywacke of Kulukak BayCMiddle to early Late JurassicDA thick marine sedimentary unit referred to as "Weary graywacke" by Hoare and others, 1975. Consists of very hard graywacke and siltstone with local conglomerate.EkBuchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.GGO002H130I Goodnews BayJ SedimentaryK3150€^AJkBGraywacke of Kulukak BayCMiddle to early Late JurassicDA thick marine sedimentary unit referred to as "Weary graywacke" by Hoare and others, 1975. Consists of very hard graywacke and siltstone with local conglomerate.EkBuchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.GHG002H130IHagemeister IslandJ SedimentaryK3150€_AJkBGraywacke of Kulukak BayCMiddle to early Late Jurassic|:€_DA thick marine sedimentary unit referred to as "Weary graywacke" by Hoare and others, 1975. Consists of very hard graywacke and siltstone with local conglomerate.EkBuchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.GNG002H130I Nushagak BayJ SedimentaryK3150€`AJkBGraywacke of Kulukak BayCMiddle to early Late JurassicDA thick marine sedimentary unit referred to as "Weary graywacke" by Hoare and others, 1975. Consists of very hard graywacke and siltstone with local conglomerate. Locally hornfelsedEkBuchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.GNG002H20130I Nushagak BayJ SedimentaryK3150MHFS€aAJmmB4Middle and Upper Jurassic turbidites of Metervik BayCLate and Middle Jurassic[~andesiteqWyWzW{W?W@WAWBWCWDWEWFWGWHWJWLWMWWandesitesBWCWDW}€aACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig€aCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GGO005H510I Goodnews BayJ SedimentaryK3151€bAJmmB4Middle and Upper Jurassic turbidites of Metervik BayCLate and Middle JurassicACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsdivisibleXWYWWW W6WkWlWmWnWoWdolomiticWdomeuWwWdomespWvW=W>WdomicalvWdominantly WWdowndraftWWdownwardWWdriftwWxWyW|WdunesWWXWYW\WpWqWrWdunesfine-grainedsandqVrVdunite~WWWWWWWdunite-pyroxeniteWWduplicatedWWduringwWxWyW|WwWekWlWmWnWoWWWWearlymWnWoWrWsWtWuWWWWlongateWelongatenorth-trendingerosionallyresistantmafictointerVelsewhereqWendzW{W}Wene-directedkWlWenhanced@WentirekWlWentirelyBWCWDWaWbWcWdWeWfWgWhWiWjWkWlWeolianCWDWEWFWIWtWuWvWepiclasticBWCWDW[WrWsWtWuWepiclasticsequenceoftuffaceousmarinesandstoneshaleand[VepochNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWequivalentrWerodedoWerosion~Wwfossilscollectedfrombasalzoneareconsideredlateearly'V,VfossilsinrelatedrocksnorthofmapareaareassignedamiVfossilsofearlycretaceousvalanginianandlatejurassicagVVVVVfossilsofpermianageinlimestonesoutheastofquardangleVfossilspollensuggestalatecretaceouspossiblymaestrichtVV VfossilsrecoveredfromlimestonearepermianandlatetriassVfound!W>rarefossilsrangefrombajocianbaseofthirdunittooxforaVbVcVdVeVfVgVhViVjVrecovered$WWrecoveredfossilsarenondiagnosticcretaceousforms$VrecrystallizedWWrecrystallizedradiolariansphanerozoicVVredWWredtoblacklaminatedargillitewithradiolarianghostslocVVrelatedWremainstWuWvWremovedWremovesWreportedWrevisedWWriverkWlWrocksWsandstonesrWscatteredWWWWW€bB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to RigCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GHG003H510IHagemeister IslandJ SedimentaryK3151€cAJmmB4Middle and Upper Jurassic turbidites of Metervik BayCLate and Middle Jurassic;=fanWW WaWbWcWdWeWfWgWhWiWjWfan-plainsBWCWfaultWW WaWbWcWdWeWfWgWhWiWjWsWtWuWWWWWWWWfault-boundedmWnWoWWWfaultedWWWWWWfaulting6WfaultsWWWWWfauna6WWWfeaturesWWWWWfeetaWbWcWWWWWWWWfeldsparWWfeldspar-richWWfeldsparsmWnWoWfelsicjWkWlW}WWfetidWWWWWpale-greenandmassiveblackserpentineformingasmOVfieldpWfillkWlWfilledWWfinePWQWXWYWWWWW WWWWW W&W(W;W<W?W@WIWLWMWQWqWWWWWWWWWfineandmedium-grainedcolumnarjointedtholeiiteandalkalPVQVfinemediumandcoarse-grainedlighttodark-grayrarelypinVVV VVVV$mineralaWbWcWdWeWfWgWhWiWjWmWnWoWrWsWtWuWxWyWzWWWWWWWWmineralsWWWWminimumWWcWdWeWfWgWhWiWjWkWlWmWnWmixed$Wmixedshale-richandsandstone-richsectionswithcoarsesan$VmmwWmoderatelypWtW|WWW W=W>WBWCWDWHWmoderatelyalteredandesiticlithicair-falltuffstuffbrecHVmoderatelyalteredrhyoliteflowsdomesandash-flowtuffsrpVmoderatelytoseverelyalteredwhitetoorangeplatyrhyolit>VmoderatelytosteeplydippingfreshtoweaklyalteredporphyBVCVDVmonzodiorite WWWWWmonzoniteWWWWWWW W W WWWWPWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWWW W(W;W<WBWCWDWQWTWUWVWkWlW€cACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig€cCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H510I Nushagak BayJ SedimentaryK3151€dAJmm1B]Middle and Upper Jurassic turbidites of Metervik Bay, conglomeratic inner fan facies (Unit 1)CLate and Middle Jurassicq%southeast6WaWbWcWdWeWfWgWhWiWjWsWtWuWWWWWsoutheast-dippingaWbWcWdWeWfWgWhWiWjWWWsoutheast-facingaWbWcWdWeWfWgWhWiWjWsoutheasternWWsouthernrWsouthwestWWWspWWWWspacedxWyWzWsparseTWspeckledWspeparatelyWsporadicWWWsporadicallyWWWWsquareWW W WWWYWWssand^W_WstpWstaticrWsteepkWlWWWsteeply|WBWCWDWstipple{W}Wstock}Wstock-likexWstocksWWstrataZWWWstratigraphicallymWnWoWWstreamMWOWPWWW Wstream-floodWW W9verywW&WBWCWDWIWXW]W^W_W`WmWnWoWpWWWWWWveryalteredpillowbasaltsequenceinterbeddedwithargilliXVvesiclesWW€dACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig+€dCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H511I Nushagak BayJ SedimentaryK3151€eAJmm2BjMiddle and Upper Jurassic turbidites of Metervik Bay, well-bedded outer (or mid?) fan lobe facies (Unit 2)CLate and Middle Jurassicvalanginian1W2W3W5W6W7W8W9WWWWWWvalleykWlWwellrWweylaqWweylapelecypodsofearlyjurassicageqVwhichxWyWzWwidelyWWWWWwithWWWWyieldedxWyWzWyields6Wzone'W,Wbh002:Tpqtuvwyz{ "#$%&*+3:=>EFGHIJKNPRSWXYZ[\wƂǂ003Vbh004!6?EZx|}'(,; )2jpv{Ăgo008 3=Chg001hg0028FQk9?U^qu~€eACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig€eCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H512I Nushagak BayJ SedimentaryK3151€fAJmm3B]Middle and Upper Jurassic turbidites of Metervik Bay, massive mid fan channel facies (Unit 3)CLate and Middle Jurassic8\along^W_WfWgWhWoWpWaWbWcWdWeWfWgWhWiWjWWWWalsowWxWyW|WxWyWzWWWWWWWWWalterationZWalteredmWnWoWpWtW{W~WW4W=W>WBWCWDWFWHWNWWWXWmWnWoWsWtWuWxWyWzWWWWWWWWWWWWWWWalteredandirregularlycataclastizedtrondhjemiticplutonicValteredclinopyroxenegabbrolocallyupto5percentorthopyValternatingmWnWoWWWamalgamated$Wammonites6W€fACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig0€fCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H513I Nushagak BayJ SedimentaryK3151€gAJmm4aBnMiddle and Upper Jurassic turbidites of Metervik Bay, conglomeratic inner fan facies (Unit 4a, channel margin)CLate and Middle JurassicbeachdWeWfWgWhWoWFWbeachdepositsdVeVbinakslitgWhWiWblackJWKWblockwWblocksWWblufffWgWhWiWbonanzaPWbrecciaWbuchia5W6WcalcareousWWWWWWcalcareousschistVVcanyon Wcanyoncreekpluton VchannelfWgWhWiWchertRWwWWWWWWchertandargillitegoodnewsterraneVchert-clast"W)W*WchloriticWclasticWW WcoarsesWtWuWcolluvium columbiaPWcomplexWconglomerate+W,W1W2W3W:WZW[WWWWWWWWWconglomeraticdWgWhWiWcoonradXWYWcreektWuWzWW WHWPWYWcretaceousWWW WWW W6WBWCWDWcrippleWcripplemountainplutonVcrooked Wcrookedmountainpluton Vcrystal-vitricIWdaciterWyWdeltaic)W*W*W€gACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig)€gCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H514I Nushagak BayJ SedimentaryK3151€hAJmm4bBgMiddle and Upper Jurassic turbidites of Metervik Bay, conglomeratic inner fan facies (Unit 4b, channel)CLate and Middle Jurassic€hACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig0€hCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H515I Nushagak BayJ SedimentaryK3151€iAJmm4cBnMiddle and Upper Jurassic turbidites of Metervik Bay, conglomeratic inner fan facies (Unit 4c, channel margin)CLate and Middle Jurassicklb26WkmvWWW W WWWWWW W6WBWCWDWPWYWaWbWcWdWeWfWgWhWiWjWkWlWWknobsvW=WkslzW Wktr>WkusmWnWoWkuskokwimfWgWhWoW}W WWWW!W)WWWWWWWWkuskokwimgroupmarinesedimentarysequenceconsistingofgr!VkuvWWW Wkvs WWkwethlukWWl2WWWWWWW€iACoherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost entirely derived from plagioclase-rich volcanic sources. Minor slaty clastsB near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar slaty cleavage weak except near northwestern fault boundary. Adjacent to Rig€iCht Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GNG006H516I Nushagak BayJ SedimentaryK3151€jAJmmB4Middle and Upper Jurassic turbidites of Metervik BayCLate and Middle JurassicAUnit added by extension of polygon from Box (1985). Description from Box: Coherently deformed volcaniclastic turbidites southeast of Right Hand Fault. Reconstructed 6 km section, divided into four turbidite facies units (using criteria of Walker and Mutti, 1973): (from bottom to top) a conglomeratic inner fan facies unit; a well-bedded, outer fan lobe facies unit; a sandy, often massive, midfan channel facies unit; and a conglomeratic inner fan facies unit. Sandstone compositions almost T*unconsolidatedGWHWunconsolidateddepositsGVHVundividedJWKWLWNWWPWWWWunitdWeWfWgWhWiWupperWWW WWW WBWCWDWJWaWbWcWdWeWfWgWhWiWjWsWtWuWWWWWWWWWWWWWWuppercretaceousgraniticplutonsVVV VuppercretaceousnonmarineclasticrockssummitislandformaVV VuppercretaceousvolcanicrocksBVCVDVuppertriassicdiabasicintrusiverocksVVuppertriassicpillowbasaltsVVuppertriassicpyroxenegabbroVuppertriassictrondhjemiteVuppertriassic-lowerjurassiccalcareousschistsVVuppertriassic-lowerjurassiccoarsevolcaniclasticrockssVtVuVWpWqWtWuWvWwWyWzW{W|W%W4W=W>W?W@WBWCWDWEWFWGWHWIWJWKWTWUWVWqWrWvW{WWWWWWbasedWWW WWW WaWbWcWdWeWfWgWhWiWjWWWWWWWWbasement~WbasinkWlWbastiteWWbaybWfWgWhWoWtWuWWWWWWWWWWWWuppermostWupwardWW WkWlWWusingaWbWcWdWeWfWgWhWiWjWvalanginian6WvalleyPWQWkWlWvariableWvariablymWnWoWvaricoloredWWWWWvariedLW8W9Wvaries,WHWmWnWoWWWWvarietyWWW WWWvariousWvaritymWnWvarnish~Wvary'WvaryingmWnWoWvegetal]WveinletsWWvergenceaWbWcWdWeWfWgWhWiWjW=1 9thirdiWjWWWthismWnWoWW€jBentirely derived from plagioclase-rich volcanic sources. Minor slaty clasts near base of lowest unit, and minor component of slate, dioritic plutonic and chert detritus in upper unit. Interbedded slump folds suggest southeast-facing paleoslope. Rare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). Tightly folded around gently northeast-plunging axes and subvertical axial planes. Northwestward vergence suggested by longer southeast-dipping limbs. Axial planar CNslaty cleavage weak except near northwestern fault boundary. Adjacent to Right Hand thrust cleavage is folded and bedding dismembered by slip along cleavage surfaces. Deformation probably latest Jurassic-earliest Cretaceous, based on appearance as clasts in Klb1. Partially replaced by prehnite-pumpellyite mineral assemblage. *ETRare fossils range from Bajocian (base of third unit) to Oxfordian (in upper unit). GGO006H3151I Goodnews BayJ SedimentaryK3151€kAJmt 3Gbasal'W,WbaseaWbWcWdWeWfWgWhWiWjWbased"W#W%W)W*WWWbayWWbeddedrWWWbeenmWnWoWbelemnites]W^W_W`WpWbelowmWnWoWWblackWWbuchia1W5W7W8W9W]W^W_W`WpWbuchiaandotherfossilsshowthatitisearlycretaceousin5Vbuchiainoceramusbelemnitesandrareammonitefragmentsran]V^V_V`VpVbuchiaofearlycretaceousvalanginianage1V7Vbuchiaofearlycretaceousvalanginianageradiolariaofear8V9Vby&WkWlWWWWWWWcalledWWcarbonaceousLWMWcenomaniam,WD€kB7Middle Jurassic volcaniclastic turbidites of Togiak BayCMiddle Jurassic ATightly folded volcaniclastic turbidites at least 1.7 km thick. Sandstones and conglomerates composed entirely of volcanic and hypabyssal igneous clasts. A few tool marks and interbedded slump folds suggest ENE-directed paleocurrents. Middle Jurassic age constrained by occurrence of Bajocian pelecypods northeast of map area in Togiak River valley (Hoare and Coonrad, 1978a). Intruded by Aeolus Mtn. gabbro body with 174 +/- 8 m.y. K-Ar amphibole age. Section in seacoast divisible into buff-c€kBolored lower member (1 km thick) and bright green-colored upper member (0.7 km). Lower unit consists of thin-bedded facies D and E fine-grained turbidites (terminology of Walker and Mutti, 1973), with channelized facies A, B, and C medium- to coarse-grained sandstones and minor chaotic facies F interbeds. Upper, more tuffaceous member mostly thin-bedded facies D and E turbidites with coarse conglomerates in upper part showing poorly defined thinning and fining upward cycles. Similar congloC*meratic rocks intruded by Aeolus Mtn. gabbro. Entire sequence interpreted as deposited on proximal channelized portion (i.e., upper to midfan) of turbidite basin fill complex. Unit is folded around subhorizontal, northeast-trending axes and steep axial planes, and lacks a penetrative cleavage. EMiddle Jurassic age constrained by occurrence of Bajocian pelecypods northeast of map area in Togiak River valley (Hoare and Coonrad, 1978a).€kFLIntruded by Aeolus Mtn. gabbro body with 174 +/- 8 m.y. K-Ar amphibole age. GGO005H512I Goodnews BayJ SedimentaryK3152€lAJmt B7Middle Jurassic volcaniclastic turbidites of Togiak BayCMiddle Jurassic ATightly folded volcaniclastic turbidites at least 1.7 km thick. Sandstones and conglomerates composed entirely of volcanic and hypabyssal igneous clasts. A few tool marks and interbedded slump folds suggest ENE-directed paleocurrents. Middle Jurassic age constrained by occurrence of Bajocian pelecypods northeast of map area in Togiak River valley (Hoare and Coonrad, 1978a). Intruded by Aeolus Mtn. gabbro body with 174 +/- 8 m.y. K-Ar amphibole age. Section in seacoast divisible into buff-c=thickbeddedquartzosesandstonepebblysandstoneandsubord)V*VthickmarineunitconsistingofvolcanicandsedimentaryrocTVUVVVvV{Vthickvariedassemblageofandesiticcommonlylaumontitized8V9VthickwidespreadmarineunitconsistingofvolcanicandsediVVVthick-bedded"W#W$W:WthicknessUWVWmWnWoWWWWWthin WWW W"W#W:WWWWWentuffaceoussandstonesiltstonear:Vthinwidespreadfine-grainedcrystallinelimestonefetidodoVthin-bedded"W&W(W;W<WQWRWTWUWVWXWkWlWvW{WWWWWWWWWWWWWWWthin-beddedfine-grainedquartzosesandstoneandslatewith"Vthin-beddedgreentobrownargillitewithoccasional1to4-RVthinly4Wthinlyinterbeddedfine-grainedgraywackeandsiliceousargi4VthinningkWlWthirdaWbWcWdWeWfWgWhWwarren@Wwas~WWwater-laid|WweakaWbWcWdWeWfWgWhWiWjWWWWweaklyBWCWDWWWWWweaklytomoderatelyfoliatedandflattenedpillowedandmasVweaklytostronglyfoliatedmetabasalthavingvariablerecryVweary]W^W_W`WpWweather'W,WweatheredsWweatheringPWwebsteriteWWwehrliteWWweldedrWtWJWLWMWwellWW WIWmWnWoWrWwell-beddedaWbWcWdWeWfWgWhWiWjWWwell-beddedcleavedsandstoneshalethinlimestoneinterbedsVwell-defined{W}Wwell-developedxWGWwell-foliatedWwell-formedWwell-indurated'W,Wwell-sorted{W}W~WBWCWEWwereWWwestWWWWWWWWWWWWWWwesternWwhereWwhichLWmWnWoWxWyWzWWWWWWWWeldBWCWDWyieldedxWyW-)northeastkWlWnoteWWindicateWWWinoceramus]W^W_W`WpWinterbeddedXWinvertebrateWinvertebratefossilsreportedbymertie1938Vis5WxWyWzWit5WjmmmWnWoWXWklb16Wklb1preservesabundantvalanginianfaunaklb2yieldsrareh6Vklb26WlateWWWWW W"W#W%W&W'W(W)W*W,W2W3W;W<WQWRWTWUWVW[W]W^W_W`WlatejurassicandorearlycretaceousagefrompoorlypreserRVlocalities(W;W<WQWlocallytWuWvWlow&WmaestrichtianWW WmammothtWuWvWmap!WkWlWmarineFW[Wmarinepelecypodsofbajocianagemiddlejurassicmarinepel[Vmegafossil"W#W%W&W)W*WmesozoicmWmiddle'W,W[W]W^W_W`WkWlWmWmiddlejurassicageconstrainedbyoccurrenceofbajocianpekVlVmucktWuWvWneartWuWvWnondiagnostic$WnonmarinetWuWvWnorth!Wnortheast€lBolored lower member (1 km thick) and bright green-colored upper member (0.7 km). Lower unit consists of thin-bedded facies D and E fine-grained turbidites (terminology of Walker and Mutti, 1973), with channelized facies A, B, and C medium- to coarse-grained sandstones and minor chaotic facies F interbeds. Upper, more tuffaceous member mostly thin-bedded facies D and E turbidites with coarse conglomerates in upper part showing poorly defined thinning and fining upward cycles. Similar congloC*meratic rocks intruded by Aeolus Mtn. gabbro. Entire sequence interpreted as deposited on proximal channelized portion (i.e., upper to midfan) of turbidite basin fill complex. Unit is folded around subhorizontal, northeast-trending axes and steep axial planes, and lacks a penetrative cleavage. EMiddle Jurassic age constrained by occurrence of Bajocian pelecypods northeast of map area in Togiak River valley (Hoare and Coonrad, 1978a).€lFLIntruded by Aeolus Mtn. gabbro body with 174 +/- 8 m.y. K-Ar amphibole age. GHG003H512IHagemeister IslandJ SedimentaryK3152€mAJlnB5Lower Jurassic? dismembered volcaniclastic turbiditesCEarly Jurassic (?)APervasively deformed and dismembered tuffaceous sandstone-shale sequence, predominately argillaceous. Sedimentary structures variably preserved and indicate deposition from turbidity currents and other mass flow processes. Original thickness uncertain. Sandstones composed of volcanic detritus with very minor chert component. Partially altered to prehnite-pumpellyite mineral assemblages. Unit divisible into two structural facies types, which occur as alternating, fault-bounded blocks. StrucXconsist'WWWconsistingLWWWWWW W!W1W7WTWUWVWvW{W|W}W~WWWWWWWWWconsistsLWmWnWoWWW W,WBWCWDW]W^W_W`WkWlWpWWWWWWWWWconsituteWconstitute^W_WfWgWhWoWWWconstitutingEWWconstrainedkWlWsWtWuWWWconstraintsWWWWcontactLW WWWW WMWWWWW€mBtural facies type one (SF1) characterized by generally well bedded sections that show varying amounts of prelithification disruption (i.e. flowage of sandstone beds, thick convoluted sections, numerous bedding-plane decollements). SF2 distinguished by its pervasive cleavage and the occurrence of sandstone boudins in an argillaceous matrix. Cleavage varies from an anastomosing "scaly" fabric of slickensided surfaces to nearly planar slaty cleavage. Fold asymmetry in both SF1 and SF2 and bloCck rotation in SF2 suggest deformation by simple shear mechanisms with a northwest-over-southeast sense. Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. u€mA.Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. .GGO005H518I Goodnews BayJ SedimentaryK3230€nAJlnB5Lower Jurassic? dismembered volcaniclastic turbiditesCEarly Jurassic (?)APervasively deformed and dismembered tuffaceous sandstone-shale sequence, predominately argillaceous. Sedimentary structures variably preserved and indicate deposition from turbidity currents and other mass flow processes. Original thickness uncertain. Sandstones composed of volcanic detritus with very minor chert component. Partially altered to prehnite-pumpellyite mineral assemblages. Unit divisible into two structural facies types, which occur as alternating, fault-bounded blocks. Struc:possiblyWW Wpost-triassicmWnWoWpre-lateWprehnite-pumpellyiteWpreservedRWmWnWoWpreserves6WquadrangleWquardangleWquestionableWradiolaria8W9WTWUWVWmWnWoWvWxWyWzW{WradiolariaoflatejurassictoearlycretaceousageandfragTVUVVVvV{VradiolarianXWwWWWWWWradiolarianfaunaininterbeddedkjcXVradiolarians:WRWWWrangeaWbWcWdWeWfWgWhWiWjWranging]W^W_W`WpWrare6W]W^W_W`WaWbWcWdWeWfWgWhWiWjWpWjurassic2W3WRWTWUWVW[W]W^W_W`WkWlWmWnWoWpWqWvWwWxWyWzW{WWWWWWWWWWWWkjcXWklb16Wklb1preservesabundantvalanginianfaunaklb2yieldsrareh6Vklb26WkuskokwimWWlaminatedWWlateWWWWW W"W#W%W&W'W)W*W,W2W3WRWTWUWVW[W]W^W_W`WpWvW{WWWWWWWWWWlatejurassicandorearlycretaceousagefrompoorlypreserRVlatestxWyWzWWlimestoneWWWlimestonesWWWlimestonescommonlycontainpermianfossilsVVVlocalitiesWWWWWWoWmiddle'W,W[W]W^W_W`WkWlWmWnWoWpWmiddlejurassicageconstrainedbyoccurrenceofbajocianpekVlVmucktWuWvWneartWuWvWnondiagnostic$WnonmarinetWuWvWnorth!Wnortheast€nBtural facies type one (SF1) characterized by generally well bedded sections that show varying amounts of prelithification disruption (i.e. flowage of sandstone beds, thick convoluted sections, numerous bedding-plane decollements). SF2 distinguished by its pervasive cleavage and the occurrence of sandstone boudins in an argillaceous matrix. Cleavage varies from an anastomosing "scaly" fabric of slickensided surfaces to nearly planar slaty cleavage. Fold asymmetry in both SF1 and SF2 and bloCck rotation in SF2 suggest deformation by simple shear mechanisms with a northwest-over-southeast sense. Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. u€nA.Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. .GHG003H518IHagemeister IslandJ SedimentaryK3230€oAJlnB5Lower Jurassic? dismembered volcaniclastic turbiditesCEarly Jurassic (?)APervasively deformed and dismembered tuffaceous sandstone-shale sequence, predominately argillaceous. Sedimentary structures variably preserved and indicate deposition from turbidity currents and other mass flow processes. Original thickness uncertain. Sandstones composed of volcanic detritus with very minor chert component. Partially altered to prehnite-pumpellyite mineral assemblages. Unit divisible into two structural facies types, which occur as alternating, fault-bounded blocks. StrucminorXWYWqW{WWW$W+W-W.W/W7W>WBWCWDWEWFW[WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWsWtWuWxWyW|WWWWWWWWWWWWWWWWmississippianWmixed$WxWyWmixedshale-richandsandstone-richsectionswithcoarsesan$VmixedunitcharacterizedbybandedtofinelylaminatedcrystxVyVyVoliteflowsdomesandash-flowtuffsrpVmoderatelytoseverelyalteredwhitetoorangeplatyrhyolit>VmoderatelytosteeplydippingfreshtoweaklyalteredporphyBVCVDVmonzodiorite WWWWWmonzoniteWWWWWWW W W WWWWPWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWWW W(W;W<WBWCWDWQWTWUWVWkWlWrWvWamphibolepWkWlWWWWWWWWWWWWWWWWWWWWamphibolesWamphiboliteWWamphibolitesWamygdaloidalWWWWWWamygdulesWWWWBWCWEWKWLWNWOWPWQWTWUWVWXWYWZW_W`WaWbWcWdWeWfWiWjWkWlWmWnWoWpWqWrWwWxWyW{W|W}W~WWWWWWWWWWW W W W WWWWWWWWWWWWWWWWW W!W"W$W%W&W'W(W)W*W+W,W-W.W/W1W2W3W4W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyW{W|W€oBtural facies type one (SF1) characterized by generally well bedded sections that show varying amounts of prelithification disruption (i.e. flowage of sandstone beds, thick convoluted sections, numerous bedding-plane decollements). SF2 distinguished by its pervasive cleavage and the occurrence of sandstone boudins in an argillaceous matrix. Cleavage varies from an anastomosing "scaly" fabric of slickensided surfaces to nearly planar slaty cleavage. Fold asymmetry in both SF1 and SF2 and bloCck rotation in SF2 suggest deformation by simple shear mechanisms with a northwest-over-southeast sense. Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. uw€oA.Poorly preserved radiolaria from SF1 have been identified as post-Triassic Mesozoic forms. Clasts of slate similar to SF2 occur stratigraphically below Bajocian fossil occurrence in adjacent Middle Jurassic turbidites (Jmm). Deposition and deformation of this complex therefore Early Jurassic in age. .GNG006H518I Nushagak BayJ SedimentaryK3230€pAJkB$Graywacke of Kulukak Bay, subdividedCMiddle to early Late JurassicDSubdivsion of unit into Box's (1985) volcaniclastic turbidites. A thick marine sedimentary unit referred to as "Weary graywacke" by Hoare and others, 1975. Consists of very hard graywacke and siltstone with local conglomerate.EkBuchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.GGO006H6130I Goodnews BayJ SedimentaryK3230€qAJlvsBVolcanic and sedimentary rocksCEarly JurassicaCatWW6WBWCWDWPWkWlWWWWWWWWWWWWWWWatomodesmaWWWWiteXWYW WWWaugite-biotite WWaugite-biotite-hornb WaugiticWavailable6WavalanchewWaxesaWbWcWdWeWfWgWhWiWjWkWlWaxialaWbWcWdWeWfWgWhWiWjWkWlWWWbkWlWbajocianaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWWbanded(W;W<WQWxWyWWbandingGWbarBWbasalLW6WbasaltLWNWOWPWRWSWTWUWVWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWqW{W|WWWWAWEWFWXWsWtWuWxWyWzWWWWWWWWWbasaltlavaflowsandcindercones_V`VaVbasaltflowsQWbasalticGWJWKWUWVW?W@WAWBWCWDWSW[WrWWWWWWWWqsedimentaryrocks0VsedimentaryrocksofsummitislandasequenceofintertonguiVVVsedimentspWKWLWM?W@WBWCWDWsemiconsolidatedFWsemiconsolidatedmarinebeachdepositspoorlybeddedsoftpeFVsensemWnWoWseparateWseparatedaWbWcWWseparatesWWWseparatingWWsequenceWWW!W#WXW[WkWlWmWnWoWWWWWsequences$WWWWseriateWWPWsericiteWsericitizedWWWserpentine~WOWWWserpentiniteNWWWWWWWWVVserpentinite-matrixNWserpentinizedWWWWWsetsWWWseveralWWW WxWyWzWWWseveralhundredfeetofvolcanicbrecciaatornearbaseofVseverely=W>Wsf1mWnWoWsf2mWnWoWshaleWWWWW W!W$W%W&W)W*W+W2W3W6WKW[W\W_atopWqWrWsWtWuWvWxWyWzW{W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW goodnewsbayJVOVPVVVWV[V`VkVsVwV}V~VCVPVXVjVmVVVVV V VVVVVV!V)V1V2V5V6V7V8VBVTV]VaVjVkVmVpVsVvVxVzV{V|V}VVVVVVVVVVVVVVVVVVVVVVVVVVVVhagemeisterKWMWUWXWZWxW{WBWFWQWYWkWnWWWWW9W?WCWUW^WbWlWnWqWrWtWuWyW~WWWWWWWWWWWWWWWWWWWWWWWWhagemeisterislandKVMVUVXVZVxV{VBVFVQVYVkVnVVVVV9V?VCVUV^VbVlVnVqVrVtVuVyV~VVVVVVVVVVVVVVVVVVVVVVVVnWqWrWtWuWyW~WWWWWWWWWWWWWe€qDMarine unit of mafic flows, some pillow structure, volcanic breccias, and massive fine- to medium-grained volcanogenic sedimentary rocks. Fractures commonly coated with laumontiteE'Weyla pelecypods of Early Jurassic age.GHG002H132IHagemeister IslandJ SedimentaryK3254MHFS€rAJlvB:Lower Jurassic interbedded volcanic and sedimentary rocks CEarly JurassicABasaltic to dacitic volcanic and volcaniclastic rocks. Volcanic rocks (locally pillowed) typically plagioclase +/- clinopyroxene +/- hornblende porphyries. Interbedded with pyroclastic and epiclastic rocks derived from similar volcanic rocks. Grades from a lower unit of massive angular pebby mudstones (marine subwave base deposits) to upper unit of abundantly fossiliferous, well bedded sandstones and shales, locally cross-bedded (shallow marine deposits). Intruded (after folding?) by earlyDlateZWtWuWwWyWzW|WWWWW W W W WWWWWWWWWWW W"W#W$W%W&W'W)W*W+WM@ marineunitofmaficflowssomepillowstructurevolcanicbrqVmarkedWWWmarkskWlWmasksWWmassmWnWoWmassesWmassiveRWSW[W\W]W^WgWhWiWqW~W WKWLWMWOWTWUWVWaWbWcWdWeWfWgWhWiWjWqWrWvWxWyW{WWWWWWWWWWWWWWWWWWWWWWWWWmassiveandthin-beddedchertinterbeddedwithsiltstoneandVVVndbasalticflowsminoramountsoftrachyVmassivecolumnar-jointedbasaltandsubordinateandesitefloqVmassivedarkfine-grainedtuffhavingblackopaquevitroclasKVmassivefinetocoarse-grainedlocallypegmatiticgreenishmVmassivepillowbasaltandbasalticbrecciainterbeddedwithVmassiverecrystallizedgraylimestonewithfetidodorofh2sVVmassivelyWmassivelybeddedgreenamphiboleandchloriteschistinterbeVQmarineunitofmaficflowssomepillowstructurevolcanicbr@massiveandthin-beddedpartlyrecrystallizedcream-colored@@match@medium-gray@members@$mineral@minor@mm@most@cmottled@Mnonmarineclasticrocksmoderatelytowellinduratedincludi@&northern@of\older@one@other@partial@partiallytocompletelyrecrystallizedschistoserockswithpaul@pebbles@Bpillowbasalthighlydeformedoftenwithslatyorspacedcle@plain@`polygons@predominantlyaltereddark-greentoalmostblackmaficvolca@Jprehnite@prennite-pumpellyite@primarily@Npyrite@raised@ree@9replacement@right@\ropy@s3@"schistosecalcareoussiltstonelimestoneandgreenishtuffac@ scoriaceous@ scrap@sedimentaryrocks@serpentiniteserpentinizedduniteandwebsteriteultramafic@€rB Middle Jurassic Hagemeister pluton. Partial static replacement by low greenschist facies mineral assemblage; more complete replacement near Hagemeister pluton (with appearance of actinolite). Divergent structural attitudes suggest polyphase folding history. EIUpper unit of abundantly fossiliferous, well bedded sandstones and shalesGHG003H516IHagemeister IslandJIgneousK3254€sATJvbB:Upper Triassic-Lower Jurassic coarse volcaniclastic rocks CEarly Jurassic-Late TriassicADense green tuffs, tuff breccias, pillow breccias, minor pillow basalt, and associated epiclastic rocks. Breccia clasts are aphanitic or plagioclase-clinopyroxene porphyries, often vesicular, mostly angular. Interbedded hyaloclastites and crystal tuffs. Devitrified glass shards common. Altered to prehnite-pumpellyite facies mineral assemblage; local hornblende and biotite hornfels around Middle Jurassic gabbroic plutons. Age northwest of Togiak fault constrained by underlying Upper Triassi derivedrWWW]depthtWuWvWderivedbWfWgWhWoWaWbWcWdWeWfWgWhWiWjWffactinoliterWWWactinoliticWaddedcWjWWWadjacentbWtWuWBWCW,zqhoareXWYWWWWW W WWW)W2W6W]W^W_W`WkWlWpWuWWWWWWWholocrystallineWWhomoclinalWWhomogeneousWhorizontalXWYWhorn}WhornblendeWWWW WWWWYWrWsWtWuW}W~WWWWWWWWWWWWWWWWWWhornblende-biotiteW W WWWPWhornblende-biotite-pWhornblenditeWWhornfelsWWWW WsWtWuWWWWWWWWWhornfelsed`WhotwWhowever@WLWhundredWWhyaloclastiteWWhyaloclastitessWtWuWhylobasaniteUWWWhypabyssalrWkWlWhypidiomorphic WWWWhypidiomorphic-granuWYWikWlWmWnWoWWWWbasaltictodaciticvolcanicandvolcaniclasticrocksvolcanrVbasaltsTWUWVWsWtWuWvW{WWWWWWWWWWWWbasaniteVWbasaticsWbaseaWbWcWdWeWfWgWhWiWjWrWWWWWfossiliferousrWWWWfossiliferousdevonianshallowmarinelimestoneVfossilsFWWW W!W$W'W,W5WaWbWcWdWeWfWgWhWiWjWWWWWWWWWWWWWWWW€sB{c basalts and crosscutting early Middle Jurassic plutons; southeast of fault, constrained only to pre-Valanginian age. iGGO005H522I Goodnews BayJIgneousK3255€tATrJvbB:Upper Triassic-Lower Jurassic coarse volcaniclastic rocks CEarly Jurassic-Late TriassicADense green tuffs, tuff breccias, pillow breccias, minor pillow basalt, and associated epiclastic rocks. Breccia clasts are aphanitic or plagioclase-clinopyroxene porphyries, often vesicular, mostly angular. Interbedded hyaloclastites and crystal tuffs. Devitrified glass shards common. Altered to prehnite-pumpellyite facies mineral assemblage; local hornblende and biotite hornfels around Middle Jurassic gabbroic plutons. Age northwest of Togiak fault constrained by underlying Upper TriassiB{c basalts and crosscutting early Middle Jurassic plutons; southeast of fault, constrained only to pre-Valanginian age. iGHG003H522IHagemeister IslandJIgneousK3255€uATrJvbbrightkWlWbroadPWQWbroadlyWWbrokenwWbrownW'W,WRWbrownishWbrownish-black~WbrunhesNWOWRWSWbuchia5W7Wbuff-coloredkWlWbutQWtWuWvWKWLWWWWWWWWbyaWbWcWmWnWtWuW@WXWYW WWW W4W6W7WBWCWDW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWrWsWtWuWxWyWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWckWlW€uB:Upper Triassic-Lower Jurassic coarse volcaniclastic rocks CEarly Jurassic-Late TriassicAUnit as described by Box (1985), shown as hornfels and unit Jlvs by Hoare and Coonrad (1978). Dense green tuffs, tuff breccias, pillow breccias, minor pillow basalt, and associated epiclastic rocks. Breccia clasts are aphanitic or plagioclase-clinopyroxene porphyries, often vesicular, mostly angular. Interbedded hyaloclastites and crystal tuffs. Devitrified glass shards common. Altered to prehnite-pumpellyite facies mineral assemblage; local hornblende and biotite hornfels around Middle JBurassic gabbroic plutons. Age northwest of Togiak fault constrained by underlying Upper Triassic basalts and crosscutting early Middle Jurassic plutons; southeast of fault, constrained only to pre-Valanginian age. GHG002H1522IHagemeister IslandJIgneousK3255MHFS€vAKJvsBVolcanic and sedimentary rocksC#Early Cretaceous to Middle Jurassic_tuffGWIJWLWrWtW{W|W:WAWEWFWHWIWJWKWLWMWRWsWtWuWwWxWyW{WWWWWWWWtuffaceous:WRWTWUWVW[WkWlWmWnWoWvWwWxWyW{WWWWWWWWWWWWWWWWWWWWWWtuffsXWYWpWW8W9W?W@WHWIWTWUWVWsWtWuWvWxWyW{WWWWWWturbiditeaWbWcWdWeWfWgWhWiWjWkWlWWWturbidite-faciesZW\Wturbidite-faciesarkosicsandstoneandshale\Vturbidite-faciesvolcaniclasticstratalocallyascoarseasZVturbiditesaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWWWturbiditicWWWturbiditicthin-beddedmediumtofine-grainedvolcaniclasticVturbiditymWnWoWtuyaXWYWtwoWWW WmWnWoWWWWearthfWgWhWoWeastWWWWeasternWWWWWWedificeXWYWeekWeitherWejectafWellipsoidsWWellipticalWellipticalerosionallyrecessivepluton40kmsquarecoarse-VelongateWelongatenorth-trendingerosionallyresistantmafictointerVelongationWWWWelsewhereqWWWWenclosingWWendzW{W}WWWWene-directedkWlWenhanced@WentirekWlWentirelyBWCWDWaWbWcWdWeWfWgWhWiWjWkWlWWWWWeolianCWDWEWFWIWtWuWvWepiclasticBWCWDW[WrWsWtWuWepiclasticsequenceoftuffaceousmarinesandstoneshaleand[VepidoteWepidote-quartz-chlorWepochNWOWRWSW[W\W]W^WbWcWdWeWfWgWhWiWequivalentrWerodedoWerosion~Wp€vAThick marine unit consisting of volcanic and sedimentary rocks. Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias. Interbedded with the volcanic rocks are tuffaceous siltstone, tuffaceous cherts, and massive thin-bedded argillite. Subdivision of unit into Box's (1985) Coarse volcaniclastic sedimentary rocks.E_Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.GGO006H6127I Goodnews BayJ SedimentaryK3255€wAJTrpB"Togiak Terrane; Phyllite and chertC$Early Jurassic and Late Triassic (?)DIGray, green, and black phyllite, fine-grained tuff, and tuffaceous chert.E7Single radiolarian collection of Early Jurassic (?) ageGBH002H3260IBethelJ MetamorphicK3260€xAJctB.Jurassic laminated tuffs and associated rocks CJurassic€xAMixed unit characterized by banded to finely laminated crystal lithic tuffs with interbedded green, white, and black tuffaceous cherts. Minor interbedded sections of massive, coarse-grained lithic tuff and (or) pillow basalt (Jpb). Highly deformed, often with slaty or spaced cleavage, which is also folded. Partially altered to prennite-pumpellyite facies mineral assemblage. Several cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). EtSeveral cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). GGO005H520I Goodnews BayJIgneousK3310€yA Jct (Jpb)B.Jurassic laminated tuffs and associated rocks CJurassicdeltaWW WdeltaicWWdenseUWVWsWtWuWdensegreentuffstuffbrecciaspillowbrecciasminorpillowsVtVdenselytWJWdepositQWwWdepositedwWxWyW|WkWlWdepositionmWnWoWWdepositionalWW WdepositionallyBWCWDWdepositsBWGWHWJWKWLWMWOWPWWWXWYWZW[W\W^W_W`WaWbWcWfWgWhWlWmWnWoWtWuWvWWFWGWHWJWWW WAWLWMWrWNprennite-pumpellyitexWyWzWpreserveWWpreservedmWnWoWpreserves6WWWWWpressureW1tkgBWCWDWtnrqWtoJWKWLW^W_WaWbWcWfWgWhWoWsWtWuWvW{W}W~WBWCWEWUWVWXWYWjWkWlWmWnWoWtWvWwWxW}W~WWWWWWWWW W W WWWWWWWWWW W#W&W'W)W+W,W2W6W:W=W>W?W@WAWBWCWDWGWHWIWPWRWTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWoWoWoWoWcmmwWWWmoderatelypWtW|WWW W=W>WBWCWDWHWWWWWWWmoderatelyalteredandesiticlithicair-falltuffstuffbrecHVmoderatelyalteredrhyoliteflowsdomesandash-flowtuffsrpVmoderatelytoseverelyalteredwhitetoorangeplatyrhyolit>VmoderatelytosteeplydippingfreshtoweaklyalteredporphyBVCVDVmonzodiorite WWWWWmonzoniteWWWWWWW W W WWWWPWWmorainal@Wmorainalridgesofallageshowevermostareprobablyassoci@VmoraineswWxWyWzW{W|W}WmoreUWVWWW WBWCWDWTWUWVWkWlWrWvW{WWWWWWWWWWWW>>sf1mWnWoWsf2mWnWoWshalesrWshallowFWWshallowmarinefossilsofplio-pleistoceneageFVshellWWWnWoWsinglewWsingleradiolariancollectionofearlyjurassicagewVslatemWnWoWstratigraphicallymWnWoWsuggestWW Wthat5Wthe!W'W,WthereforemWnWoWthirdaWbWcWdWeWfWgWhWiWjWthismWnWoWthree"Wtithonian[WxWyWzWtoTWUWVW]W^W_W`WaWbWcWdWeWfWgWhWiWjWmWnWoWpWvW{WWWWtogiakkWlWtoptWuWvWtriassicWWWWWWtuffsLWMWturbiditesmWnWoWturonian"W#W%W&W)W*Wtwo#WunitaWbWcWdWeWfWgWhWiWjWrWunits&Wupper'W,WaWbWcWdWeWfWgWhWiWjWrWWWupperunitofabundantlyfossiliferouswellbeddedsandstonerV.Hsf1@show@>stratigraphically@valanginian@€yAMixed unit characterized by banded to finely laminated crystal lithic tuffs with interbedded green, white, and black tuffaceous cherts. Minor interbedded sections of massive, coarse-grained lithic tuff and (or) pillow basalt (Jpb). Highly deformed, often with slaty or spaced cleavage, which is also folded. Partially altered to prennite-pumpellyite facies mineral assemblage. Several cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). EtSeveral cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). GHG003H520IHagemeister IslandJIgneousK3310€zAJpbB.Jurassic laminated tuffs and associated rocks CJurassic€zAPillow basalt. Highly deformed, often with slaty or spaced cleavage, which is also folded. Partially altered to prennite-pumpellyite facies mineral assemblage. Several cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). EtSeveral cherts have yielded radiolaria of Jurassic age, one of which is identified as Tithonian (latest Jurassic). GGO005H521I Goodnews BayJIgneousK3310€{AKJvsB*Volcanic and sedimentary rocks, subdividedC#Early Cretaceous to Middle JurassicAoThick marine unit consisting of volcanic and sedimentary rocks. Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias. Interbedded with the volcanic rocks are tuffaceous siltstone, tuffaceous cherts, and massive thin-bedded argillite. Subdivision of unit into Box's (1985) Laminated tuff.owhite>WxWyWWWWWWWWWwhitegrayandbrownishlocallygarnetiferousmarbleizedlimVe-rockBWCWDWwideWWwidespreadWWWWWWwindpWwind-blownQWwindblownMWOWPWwisconsin@WAWDWwithaWbWcWpWtWuWvWW@WAWDWEWTWXWYWvW}WWWWW W WWWW W"W#W$W'W,W2W3W7WBWCWDWGWHWIWRWTWUWVWXW[W]W^W_W`WkWlWmWnWoWpWqWrWvWxWyWzW{WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWwithinWwood]WtWuWvWykWlWWWWWWyellowLWyieldBWCWDWWWWWWyieldedxWyWzWWB` pillowbasalthighlydeformedoftenwithslatyorspacedclezVpillowbasaltsaphanitictoporphyriticwithinterbeddedpilVVpillowbasaltsassociatedbrecciasanddiabasicintrusiveinVVpillowedrWWpinkvW}WWWWW WWWWWpinkandgrayfine-grainedquartz-feldsparporphyrylocally}Vpinklighttodark-grayfinetocoarse-grainedgranitequartVplWWplacersWWplacespWplagioclaseTWmWnWoWWWBWCWDWrW|W}W~WWWWWWWWWWWWWWWWWWWWplagioclase-clinopyrsWtWuWWWplagioclase-pyroxeneEWplagioclase-richaWbWcWdWeWfWgWhWiWjWlocallytWuWvWWWWWlocallyfossiliferouswithmiddlejurassicfaunaVVlow&WmaestrichtianWW WmammothtWuWvWmap!WkWlWWWWmarineFW[WWWmarinepelecypodsofbajocianagemiddlejurassicVmarinepelecypodsofbajocianagemiddlejurassicmarinepel[Vmegafossil"W#W%W&W)W*WmertieWmesozoicmWnWoWmiddle'W,W[W]W^W_W`WkWlWmWnWoWpWWWWWWWWmiddlejurassicageconstrainedbyoccurrenceofbajocianpekVlVmississippianWWWmississippianfossilsVmountainsWmucktWuWvWneartWuWvWnondiagnostic$WnonmarinetWuWvWnorth!WWWWnortheastWnortheastheastheastheastheastheastFnortheastkoccur@-organic@:possibly@rarefossilsrangefrombajocianbaseofthirdunittooxfor@section@>section@>€{E_Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.GGO006H6128I Goodnews BayJ SedimentaryK3310€|AJtB TrondhjemiteCJurassic and Jurassic (?)DqLight-gray, medium-grained intrusive trondhjemite consisting of abundant quartz, plagioclase, and minor chlorite.GGO002H169I Goodnews BayJIgneousK3380€}AJgBGabbroic rocksCJurassic and Jurassic (?)DMedium- to coarse-grained, locally pegmatitic intrusive gabbroic rocks consisting of hornblende, clinopyroxene, and calcic plagioclaseF5K/Ar age range of 159.3 to 186.9 m.y. from hornblendeGGO002H167I Goodnews BayJIgneousK3406€~AJgBGabbroic rocksCJurassic and Jurassic (?)DMedium- to coarse-grained, locally pegmatitic intrusive gabbroic rocks consisting of hornblende, clinopyroxene, and calcic plagioclaseF5K/Ar age range of 159.3 to 186.9 m.y. from hornblendeGHG002H167IHagemeister IslandJIgneousK3406€AJmgB Middle Jurassic gabbroic plutonsCMiddle Jurassic}jurassicandjurassic|V}V~VVVVjurassicpermianVVjurassic-latesWtWuWWW~ and}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWand/orWWWWZ€AMedium- to coarse-grained (locally pegmatitic) hornblende gabbro to diorite bodies, slightly altered (i.e., sericitized plagioclase, hornblende partially replaced by actinolite and chlorite, prehnite-quartz veinlets). Intrusive into a variety of units with narrow contact zone of hornblende- and biotite-bearing hornfels. At Downdraft Mtn. and Crater Hill, plutons intrude both unfoliated volcaniclastic rocks and structurally underlying schistose rocks. Similar hornblende gabbro bodies (localBly pegmatitic) occur marginal to dunite-pyroxenite bodies at Red and Susie Mtns. K-Ar amphibole ages range from 186 to 159 (minimum) m.y., or Middle Jurassic. FNK-Ar amphibole ages range from 186 to 159 (minimum) m.y., or Middle Jurassic. GGO005H546I Goodnews BayJIgneousK3406€AJmgB Middle Jurassic gabbroic plutonsCMiddle Jurassicjmmabcjjmm1djmm2ejmm3fjmm4agjmm4bhjmm4cijmtkljmujmvjpbyWzjpvss|jtrmbjtrmcjtrpwjumjvc[jvsZkb5kcg1kcgg(;kvs:nmpzcspzmgqqaqalqb$%&'(/TXYqc qd12;=>?qes)*+qfqg789WLWMWWWWrhyolitedomesandflowsfoundassmallknobsorhillsmoder=VrhyoliticjWkWlWrichWWXWYW\Wridge5W7WWridgesfWgWhWoW@WJWriebeckiticpWanaWbWcWXWYWwW~W6WmWnWoWWWanastomosingmWnWoWandAWBWCWDWEWFWIWMWOWPWQWRWSWUWVWWWXWYW\W]W^W_W`WaWbWcWfWgWhWlWmWnWoWpWsWtWuWvWwWxWyWzW{W|W}W~WWBWCWEWKWLWNWOWPWQWTWUWVWXWYWZW_W`WaWbWcWdWeWfWiWjWkWlWmWnWoWpWqWrWwWxWyW{W|W}W~WWWWWWWWWWW W W W WWWWWWWWWWWWWWWWW W!W"W$W%W&W'W)W*W+W,W-W.W/W1W2W3W4W5W6W7W8W9W:W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWRWSWTWUWVWWWXWYW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyW{W|W|W|Wj€AMedium- to coarse-grained (locally pegmatitic) hornblende gabbro to diorite bodies, slightly altered (i.e., sericitized plagioclase, hornblende partially replaced by actinolite and chlorite, prehnite-quartz veinlets). Intrusive into a variety of units with narrow contact zone of hornblende- and biotite-bearing hornfels. At Downdraft Mtn. and Crater Hill, plutons intrude both unfoliated volcaniclastic rocks and structurally underlying schistose rocks. Similar hornblende gabbro bodies (localBly pegmatitic) occur marginal to dunite-pyroxenite bodies at Red and Susie Mtns. K-Ar amphibole ages range from 186 to 159 (minimum) m.y., or Middle Jurassic. FNK-Ar amphibole ages range from 186 to 159 (minimum) m.y., or Middle Jurassic. GHG003H546IHagemeister IslandJIgneousK3406€AJvsBVolcanic and sedimentary rocksCMiddle to early Late Jurassic€DVolcanic and sedimentary rocks consisting of andesitic, trachytic, and basaltic flows and breccias with interbedded fine- to coarse-grained sedimentary rocksEPFossils in related rocks, north of map area, are assigned a Middle Jurassic age.GBH003H131IBethelJ SedimentaryK3450€AJabBKAndesitic and Basaltic lava flows and marine epiclastic rocks, Nyac terraneCMiddle JurassicDYAndesitic and basaltic lava flows, flow breccias, and tuffaceous marine sedimentary rocksE3Marine pelecypods of Bajocian age (Middle Jurassic)GBH002H3450IBethelJ SedimentaryK3450€AKkvBKuskokwim Group, volcanic rocksCJurassicASMassive andesitic and basaltic flows; minor amounts of trachyte, trachyandesite, and dacite; some interbedded tuffaceous sedimentary rocks; and locally several hundred feet of volcanic breccia at or near base. These rocks from a belt of low rolling hills on the west flank of the Kuskokwim Mountains from the Kwethluk River and northward.S€EYOriginally called Cretaceous on map; note revised to Jurassic and removed from Kuskokwim.GBH004H32261IBethelJIgneousK3450€AKkvB!Kuskokwim Group, volcanic brecciaCJurassicAISeveral hundred feet of volcanic breccia at or near base of massive andesitic and basaltic flows; minor amounts of trachyte, trachyandesite, and dacite; some interbedded tuffaceous sedimentary rocks. These rocks from a belt of low rolling hills on the west flank of the Kuskokwim Mountains from the Kwethluk River and northward.IEYOriginally called Cretaceous on map; note revised to Jurassic and removes from Kuskokwim.GBH004H32261IBethelJIgneousK3450€AJmvB;Middle Jurassic interbedded volcanic and sedimentary rocks CMiddle JurassicsjurassicWWWWWWWWWWWWWWWWWWWąCbOąCЂтąC ąC0ąEąE ąE0ąE@ąF5ąFąFąJS bairdCWRW_WcWgWnWuW_W-WbairdinletCVRV_VcVgVnVuV_V-VbayEWIWJWLWNWOWPWSWTWVWWWYW[W\W^W`WbWdWeWfWiWjWkWlWmWqWrWsWtWwWyW|W}W~W@WAWCWDWPWXWjWlWmWoWWWWWWW W WWWWWWW W!W)W1W2W5W6W7W8W@WBWDWTW]W_W`WaWcWdWeWfWgWhWiWjWkWmWoWpWsWvWxWzW{W|W}WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWTZpqtuvwxyz{|} "#$%&'(*+,3:;<=>EFGHIJKNOPQRSVWXYZ[\włƂǂ€ABasaltic and andesitic volcanic and volcaniclastic rocks, extensively altered to prehnite-pumpellyite facies assemblage. Volcanic rocks more common in lower third of exposed section, characterized by plagioclase + clinopyroxene +/- hornblende porphyries. Interbedded clastic rocks composed almost entirely of volcanic lithic detritus, except lower conglomerates, which contain a minor proportion of clasts of granitic plutonic rocks similar to adjacent Hagemeister pluton. Sedimentary facies raBXnge from fluvial deltaic to nearshore marine to subwave base turbidites. Locally fossiliferous with Middle Jurassic fauna. Strata broadly homoclinal with steep southeast dip and local zones of intense, northwest-vergent deformation. Unit structurally overlies Lower Jurassic rocks on southeast-dipping fault (probable faulted unconformity). FE1Locally fossiliferous with Middle Jurassic fauna.GGO005H514I Goodnews BayJ SedimentaryK3451€AJmv%basalticandandesiticvolcanicandvolcaniclasticrocksextVVbasalticflowsandsillsflowsrangeinthicknessfrom20cmUVVV€B;Middle Jurassic interbedded volcanic and sedimentary rocks CMiddle JurassicABasaltic and andesitic volcanic and volcaniclastic rocks, extensively altered to prehnite-pumpellyite facies assemblage. Volcanic rocks more common in lower third of exposed section, characterized by plagioclase + clinopyroxene +/- hornblende porphyries. Interbedded clastic rocks composed almost entirely of volcanic lithic detritus, except lower conglomerates, which contain a minor proportion of clasts of granitic plutonic rocks similar to adjacent Hagemeister pluton. Sedimentary facies raBXnge from fluvial deltaic to nearshore marine to subwave base turbidites. Locally fossiliferous with Middle Jurassic fauna. Strata broadly homoclinal with steep southeast dip and local zones of intense, northwest-vergent deformation. Unit structurally overlies Lower Jurassic rocks on southeast-dipping fault (probable faulted unconformity). FE1Locally fossiliferous with Middle Jurassic fauna.GHG003H514)€IHagemeister IslandJ SedimentaryK3451€AJumBUltramafic rocksCJurassic and Jurassic (?)DCSerpentinite, serpentinized dunite and websterite ultramafic rocks.F5K/Ar age range of 176.4 to 186.9 m.y. from hornblendeGGO002H168I Goodnews BayJIgneousK3495€AJumBUltramafic rocksCJurassic and Jurassic (?)DCSerpentinite, serpentinized dunite and websterite ultramafic rocks.F5K/Ar age range of 176.4 to 186.9 m.y. from hornblendeGHG002H168IHagemeister IslandJIgneousK3495€AJmuB#Middle Jurassic ultramafic plutons CMiddle Jurassic'€AOccur only at Red and Susie Mtns. at west end of map area. Medium-grained dunite, wehrlite, and clinopyroxenite, partially (less than 25 percent) replaced by serpentine minerals. Around margins cut by numerous coarsely pegmatitic hornblendite dikes. Northeast flank of Susie Mtn. appears to grade into adjacent hornblende gabbro body. Intrusive into surrounding schistose country rock, with moderately wide (1/2 mile) zone of hornblende- and biotite hornfels. Hornblendite dikes yield Middle JuByrassic K-Ar amphibole ages. Apparent source of platinum placers between Red Mtn. and Susie Mtn. (Bird and Clark, 1976). gF>Hornblendite dikes yield Middle Jurassic K-Ar amphibole ages. GGO005H548I Goodnews BayJIgneousK3495€AJmuB#Middle Jurassic ultramafic plutons CMiddle Jurassicg03.0W300XWYWvW3000W325WW4vW4-cmRW40W400WW W45-46WW5W5-25WW5-cmW50aWbWcWWW500vWWWWW5005W5090W6aWbWcWdWeWfWgWhWiWjWW60-90WWWW~WWWWW WWWWWWW W'W,W8W9WOW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWrWWWWWWWWWWWWWathickmarinesedimentaryunitreferredtoaswearygraywac]V^V_V`VabdWaboutXWYWWaboveaWbWcWWabundanceWW WabundanttWuWvWmWnWoWWWW6WKWTWUWVWvW{W|WWWWabundantsillsanddikescuttingkusandjlninvicinityofmVnVoVabundantlyrWaccessoryXWYWmWnWoWWWW WBWCWDWacrossWWW W€AOccur only at Red and Susie Mtns. at west end of map area. Medium-grained dunite, wehrlite, and clinopyroxenite, partially (less than 25 percent) replaced by serpentine minerals. Around margins cut by numerous coarsely pegmatitic hornblendite dikes. Northeast flank of Susie Mtn. appears to grade into adjacent hornblende gabbro body. Intrusive into surrounding schistose country rock, with moderately wide (1/2 mile) zone of hornblende- and biotite hornfels. Hornblendite dikes yield Middle JuByrassic K-Ar amphibole ages. Apparent source of platinum placers between Red Mtn. and Susie Mtn. (Bird and Clark, 1976). gF>Hornblendite dikes yield Middle Jurassic K-Ar amphibole ages. GHG003H548IHagemeister IslandJIgneousK3495€ATKgBGranitic rocksCTertiary and CretaceousDFine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks. Chiefly quartz monzonite, granodiorite, and quartz diorite€F?K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblendeGHG002H165IHagemeister IslandJIgneousK3510€AJmfB#Middle Jurassic granodiorite plutonCMiddle JurassicAMedium-grained biotite-hornblende granodiorite of Hagemeister Island; slightly altered (i.e. sericitized plagioclase, chlorite partially replacing biotite and hornblende). Intrusive into Lower Jurassic rocks (Jlv) with narrow contact metamorphic zone of hornblende-biotite-plagioclase hornfels. Clasts of similar granodiorite clasts occur in adjacent Bajocian conglomerates. Yielded K-Ar hornblende age of 183 +/- 7 m.y. F1Yielded K-Ar hornblende age of 183 +/- 7 m.y. GHG003H544IHagemeister IslandJIgneousK3510€APzmgBMetagabbro and greenstoneC Paleozoic (?)DMassive, fine- to coarse-grained, locally pegmatitic, greenish metagabbro and greenstone. Probable dismembered altered ophiolite complex consisting of mafic flows, dikes, volcaniclastic rocks, and gabbro.GHG002H147IHagemeister IslandD€J MetamorphicK3890€ATrubB"Upper Triassic (?) pillow basalts CUpper Triassic APillow basalts, aphanitic to porphyritic, with interbedded pillow breccia, hyaloclastite, and interpillow and interbedded red and white radiolarian chert. Porphyries consist of plagioclase + clinopyroxene phenocrysts with intergranular to subophitic groundmass of plagioclase and clinopyroxene and secondary replacement minerals. Commonly amygdaloidal with abundant vesicles filled by chlorite, clinozoisite, prehnite, pumpellyite or calcite, or some combination. Considered Upper Triassic baseB2d on radiolarian ages of associated bedded chert.  EPConsidered Upper Triassic based on radiolarian ages of associated bedded chert. GGO005H524I Goodnews BayJIgneousK3891€ATrubB"Upper Triassic (?) pillow basalts CUpper Triassic metervikaWbWcWdWeWfWgWhWiWjWmideWfWmiddleaWbWcWdWeWfWgWhWiWjWkWlWWWWWWWWmiddleandupperjurassicturbiditesofmetervikbayaVbVcVjVmiddleandupperjurassicturbiditesofmetervikbayconglomdVgVhViVmiddleandupperjurassicturbiditesofmetervikbaymassivefVmiddleandupperjurassicturbiditesofmetervikbaywell-beeVmiddlejurassicgabbroicplutonsVVmiddlejurassicgranodioriteplutonVmiddlejurassicinterbeddedvolcanicandsedimentaryrocksVVmiddlejurassicultramaficplutonsVVmiddlejurassicvolcaniclasticturbiditesoftogiakbaykVlVminorWWWmixed#W$Wmonzonite W<=completerWcompletelyWWWWWWJprehniteWWWWprehnite-pumpellyiteaWbWcWdWeWfWgWhWiWjWmWnWoWsWtWuWWWWWprehnite-quartzWWprelithificationmWnWoWpremetamorphicWcommonWWsWtWuWWWWWWWWcommonlyjWkWlWxW'W,W1W8W9WqWWWWWWWWG_constrained&WkWlWWWWcontainWWWcontainingtWuWvWcoonradkWlWcretaceousWWWWW W!W"W#W$W%W'W)W*W,W1W2W3W5W7W8W9W:WRWTWUWVWvW{WWWWWWWWdeformationmWnWoWdepositionmWnWoWdepositstWuWvWdevonianWWWWWWearliestWearly!W&W'W,W1W2W3W5W7W8W9W:WRWTWUWVW]W^W_W`WmWnWoWpWqWvWwW{WWWWWWWWWearlycretaceousalbianageassignedfromfossilsfoundnort!Vearlycretaceouspelecypodsandradiolarians:VeastWWeekWfaciesWfauna6WXWWWforms$WmWnWoWfossil2W3WmWnWoW€APillow basalts, aphanitic to porphyritic, with interbedded pillow breccia, hyaloclastite, and interpillow and interbedded red and white radiolarian chert. Porphyries consist of plagioclase + clinopyroxene phenocrysts with intergranular to subophitic groundmass of plagioclase and clinopyroxene and secondary replacement minerals. Commonly amygdaloidal with abundant vesicles filled by chlorite, clinozoisite, prehnite, pumpellyite or calcite, or some combination. Considered Upper Triassic baseB2d on radiolarian ages of associated bedded chert.  EPConsidered Upper Triassic based on radiolarian ages of associated bedded chert. GHG003H524IHagemeister IslandJIgneousK3891€AJtB TrondhjemiteCJurassic and Jurassic (?)DqLight-gray, medium-grained intrusive trondhjemite consisting of abundant quartz, plagioclase, and minor chlorite.GHG002H169IHagemeister IslandJIgneousK3892€ATrutBUpper Triassic (?) trondhjemiteCLate Triassic(?) onewWFWmWnWoWxWyWzWoneblockandashflowmappedinareabrokenblocksofdacitwVonlymWnWoWsWtWuWWWWWWopaqueKWopenWWWophioliteWWWopposingWWWoraWbWcWUWVWZWvWWWW W=WsWtWuWxWyWzWWWWWWWWWWWWWWWWWWWWorangevW>WorderWW WordovicianWWWorganicCWDWEWIWRWSWUWVWorientedWWorigintWuWvWWW W6WBWCWDWoriginalW WWWmWnWoWWWoriginally~WWWoriginallymappedasmzpzbyhoareabdcoonrad1978unitisVoriginallyshownaspartofunitkjvsbyhoareandcoonrad1VorthoclasemWnWoWorthogneissWorthopyroxeneBWCWDWWWW@ islandspWGWHWIWJWKWLWMWUWVWWWsW~W€AAltered and irregularly cataclastized trondhjemitic plutonic rocks composed of plagioclase and quartz with minor seams of chlorite, sericite, and clinozoisite (lawsonite locally: Hoare and Coonrad, 1978b). Shown on map only south of Security Cove but small bodies occur within altered diabase near Cape Newenham. Security Cove body is a northeast-dipping slab faulted above and below against schistose rocks (JTrmb and JTrmvss, respectively). Tentatively assigned a Late Triassic age based probB~able cogenetic relationship with Upper Triassic basalt (Trub) and other components of dismembered ophiolite (Trud, Trug, su). lGHG003H554IHagemeister IslandJIgneousK3892€ATrudB,Upper Triassic (?) diabasic intrusive rocks CLate Triassic(?) +ZmaastrichtianEWJWmaestrichtianWWWIWmesozoicWWWWWWWWmesozoicandorpaleozoicVVVVVVVVmiddle|W'W,WTWUWVW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWvW{WWWWWWWWWWWmiddlejurassickVlVVVVVVVVVmiddlelatecenomaniamandconiaciantolateearlycretaceou'V,Vmiddletoearlylatejurassic]V^V_V`VpVVmiddletolatetertiary|VmiddletriassictolatedevonianVmississippianWWWWWorFWZWtWuWwWyWzWW WWWWW&WRWSWXWWWWWWWWWWWordovicianWWWWWWWWWWWr€ASubophitic, holocrystalline plagioclase-clinopyroxene diabase (grain size to 1.5 mm). Occurs as 0.3 to 1.0-m-wide sills and dikes with basalt and chert screens west of Matogak River mouth, as thick sills intruding chert at Pyrite Point, as dikes cutting gabbro south of Chagvan Bay, and elsewhere mostly massive and highly altered to low greenschist facies assemblage. Altered to hornblende hornfels west of Matogak River mouth by underlying gabbroic pluton (Griscom, 1978); K-Ar amphibole age Bof hornfels is 187 +/- 10 m.y. Believed to be cogenetic with associated, overlying Upper Triassic pillow basalt (Trub). Faulted over mafic schists on hill just west of Matogak River mouth. F2K-Ar amphibole age of hornfels is 187 +/- 10 m.y. GHG003H550IHagemeister IslandJIgneousK3893€ATrudB,Upper Triassic (?) diabasic intrusive rocks CLate Triassic(?) {truttrvstv|?@xo1dW1980XWYW1983WW W2eW3fW4agW4bhW4ciWahzwiryukfWair-fallHWalbitexWalbiterhyolitexValkalicNWOWbWcWdWeWfWalkalicbasaltofahzwiryukblufffValkalicbasaltofkaronlakeNVOVbVcVdVeValluvialWWXWYW\W^W_WpWalluvialdepositsWVXVYV\V^V_ValluviumZW[W]WamphiboliteWamphibolite-faciesWamphibolite-faciesorthogneissandamphibolitewithminorinVandXWYWqWrWwWyW{WWWWWW W&W1W2W3W4W7W8W9W:W=W>W?W@WAWEWIWLWMWPWRWSWTWUWVWZW[W\WaWbWcWdWeWfWgWhWiWjWqWrWvWwWxWyWzW{WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW  subordinateqWyW{W)W*WWWsubverticalaWbWcWdWeWfWgWhWiWjWsubwaverWWWsugaryGWsuggestaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWrWWWsuggestedaWbWcWdWeWfWgWhWiWjWWsuggestingWWWsuggestsWWWWWWWsW~WsurfacesaWbWcWdWeWfWgWhWiWjWmWnWoWsurficialJWKWLW^W_WfWgWhWoWsurroundingWWWsusieWWWWsyenitic WsynWWsynmetamorphicWWtalcBWCWDWtallusyW|WtaluswWxWtanGWtectoniteWWtentativelyWtephraNWOWbWcWdWeWterminologykWlWterraceMWOWPWQWterraces^W_WfWgWhWoWBWCWEWterraneWtextureTWXWYWWtexturedGWtgrW4WthanXWYWfWiWWW WHWYWWWthatzW WWW WIWmWnWoW€AOriginally mapped as MzPz by Hoare abd Coonrad (1978), unit is shown as described by Box (1985) with hornfels of Hoare and Coonrad (1978) added. Subophitic, holocrystalline plagioclase-clinopyroxene diabase (grain size to 1.5 mm). Occurs as 0.3 to 1.0-m-wide sills and dikes with basalt and chert screens west of Matogak River mouth, as thick sills intruding chert at Pyrite Point, as dikes cutting gabbro south of Chagvan Bay, and elsewhere mostly massive and highly altered to low greenschisBPt facies assemblage. Altered to hornblende hornfels west of Matogak River mouth by underlying gabbroic pluton (Griscom, 1978); K-Ar amphibole age of hornfels is 187 +/- 10 m.y. Believed to be cogenetic with associated, overlying Upper Triassic pillow basalt (Trub). Faulted over mafic schists on hill just west of Matogak River mouth. >F2K-Ar amphibole age of hornfels is 187 +/- 10 m.y. GHG002H1550IHagemeister IslandJIgneousK3893MHFS€ATrugB"Upper Triassic (?) pyroxene gabbroV = ÄIÄIÄIÄJaÄJÄJÄQFÄS&ÄX!ÄYÄZaÄa7ÄaVÄaaÄaqÄaÄc(Äc6ÄcJÄhAÄhWÄi!‚ÂĂՂÄu#ÄvǂÄzɂʂÄ!Ä1͂΂ €CLate Triassic(?)AAltered clinopyroxene gabbro, locally up to 5 percent orthopyroxene. Augitic pyroxene (diallage) often kinked and fractured, occasionally rimmed or replaced by pale-green actinolitic amphibole. Plagioclase partially to completely replaced by fine aggregate of albite, epidote, chlorite, calcite and iron oxides. Grain size varies from 0.2 to 3.0 cm, defining complexly crosscutting intrusive bodies. Compositional layering rare. Locally grades into diabase (Trud) south of Chagvan Bay by increas€Bsing proportion of crosscutting diabasic dikes. Faulted over schistose rocks around Security Cove and Cape Peirce, locally mylonitized (epidote-quartz-chlorite-calcite) along contact. Similar mylonites occur sporadically along contact between gabbro and structurally underlying diabase near Cape Newenham. Believed cogenetic with associated diabase (Trud), pillow basalt (Trub), trondnjemite (Trut) and serpentinized ultramafic rocks (su), as part of a dismembered ophiolite of uncertain petrotCectonic affinity. GHG003H552IHagemeister IslandJIgneousK3894€AsuBSerpentinized ultramafic rocks -zgabbroic}W~WWWgabbroicrocks}V~VgemukWWWWWWWWWWWgemukgroupVgemukgroupchertsiltstonegraywackeandlimestoneVgemukgroupgraywackesiltstoneandconglomerateVVVVVgemukgrouplimestoneandcalcareoussiltstoneandsandstoneVgemukgroupvolcanicrocksVVsandstoneVgemukgroupvolcanicrocksVVVVWW W WWWWgraniticrocksVVVV VVVVgranodioriteWgraywacke(W1W4W5W6W;W<WQW]W^W_W`WpWWgraywackeandconglomerate1Vgraywackeofbuchiaridge5Vgraywackeofkulukakbay]V^V_V`VgraywackeofkulukakbaysubdividedpVgraywacke-siltstone-W.W/Wgraywacke-siltstonesequence-V.V/VgreenstoneWgrit7Wgroup!W"W#W$W%W&W'W(W)W*W+W,W;W<WQWWWWWWW C islandWWWWWWWWWWW: inletCWRW_WcWgWnWuW_W-WislandDWGWKWMWUWXWZWhWoWxW{WBWFWNWQWRWYW[W]W^W`WbWdWfWgWiWkWnWWWWW.W/W0W9W?WCWUW^WbWlWnWqWrWtWuWyW~WWWWWWWWWWWWW€AThoroughly serpentinized ultramafic rocks. Protoliths were predominately harzburgite (5-25 percent bastite pseudomorphs after orthopyroxene) with subordinate dunite and rare clinopyroxenite. Locally near Cape Newenham preserves a lineated tectonite fabric. Varies from blocky, unsheared protoliths to slickensided serpentinite enclosing blocks with original fabrics. Serpentinite locally cut by boudinaged rodingitized diabasic dikes on east shore of Security Cove. Both types occur as narrow, B`fault-bounded bodies separating mafic igneous units or structurally underlying schistose units. NGGO005H556I Goodnews BayJ MetamorphicK3895€AsuBSerpentinized ultramafic rocks €AThoroughly serpentinized ultramafic rocks. Protoliths were predominately harzburgite (5-25 percent bastite pseudomorphs after orthopyroxene) with subordinate dunite and rare clinopyroxenite. Locally near Cape Newenham preserves a lineated tectonite fabric. Varies from blocky, unsheared protoliths to slickensided serpentinite enclosing blocks with original fabrics. Serpentinite locally cut by boudinaged rodingitized diabasic dikes on east shore of Security Cove. Both types occur as narrow, B`fault-bounded bodies separating mafic igneous units or structurally underlying schistose units. NGHG003H556IHagemeister IslandJ MetamorphicK3895€APzcsBCalcareous schistC PaleozoicDISchistose calcareous siltstone, limestone, and greenish tuffaceous rocks.GGO002H150I Goodnews BayJ MetamorphicK3950€APzcsBCalcareous schistC PaleozoicDISchistose calcareous siltstone, limestone, and greenish tuffaceous rocks.GHG002H150IHagemeister IslandJ MetamorphicK3950€AJTrmc8againstWageaWbWcW|WWWW WkWlWmWnWoWsWtWuWxWyWzWWWWWWWWWWWWWWWWWWWWWWWWWWages@WBWCWDWWWWWWWWWWWWaggregateWahzwiryukfWair-fallHWIWalbitexWWalbite-epidote-chlorWalkalicNWOWUWVWWWbWcWdWeWfWalkalicbasaltofahzwiryukbluffnubblymottledflowsandpfValkalicbasaltofkaronlakecinderconesflowsandtephranNVOVdVeValkalicbasaltofkaronlakecinderconesflowsandtephrarbVcVall@WalluvialBWFW^W_WfWgWhWlWmWnWoWpWWW Walluvialssandgravelandsiltalongmajorstreamsandriver^V_ValluviumMWOWPWQWWWXWYWZW[W\W^W_WaWbWcWwWxWyW|WWalluviumincludessomebeachdepositsZV[ValmostBWCWDWaWbWcWdWeWfWgWhWiWjWWWEunshearedWWunsortedWupwWWWuponLWWWupperXWYW~WWWW WWW W6WBWCWDWaWbWcWdWeWfWgWhWiWjWkWlWrWsWtWuWWWWWWWWWWWWI€B0Upper Triassic-Lower Jurassic calcareous schistsCEarly Jurassic-Late TriassicAPartially to completely recrystallized calcareous phyllites and schists. Protoliths include calcareous sandstones and shales, limestone conglomerates, limestone, volcanic conglomerates and mafic volcanic rocks. Clastics locally preserve turbidite features. Greenschist to transitional greenschist-blueschist metamorphic mineral assemblages. Strong fabric development (S2) by synmetamorphic flattening and (or) mylonitization. Lineation (L2) formed by mineral alignment (amphibole, plagioclase) €Bor clast elongation. Similar syn- and post-metamorphic structural history to both overlying schistose units (JTrmb, JTrmvss). Also preserves a pre-metamorphic deformation (D1); pre-metamorphic deformation recorded by tight folds (F1) with axial planar slaty cleavage (S1), both of which are folded by synmetamorphic folds (F2) with noncoplanar foliation (S2). Similarity of protoliths to structurally underlying rocks (Pb, Pvs, Pl) suggests Permian age of protoliths. Metamorphic age constraintCs as for JTrmb and JTrmvss. GGO005H540I Goodnews BayJ MetamorphicK3950€AJTrmcB0Upper Triassic-Lower Jurassic calcareous schistsCEarly Jurassic-Late TriassicV\earlytertiary?V@VearlytertiaryandorlatecretaceoustVuVwVyVzVV VVVVVearlytertiarycretaceousandjurassicWVYVVearlytertiarytolatecretaceousAVeocenepWqWholoceneFWRWSWTWUWVW12wWxWyW|WNWOWRWSW[W\W]W^WbWcWdWeWholoceneandpleistoceneFVwVxVyV|VjurassicRWSWTWUWVWWWXWYWZ[W\]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWvWwWxyz{W|W}W~WWWWWWWNpyritemWnWoWWWpyroclasticGWHWJWfWyWLWMWrWpyroclasticdepositsHVpyroclasticdepositslargelybasaltictuffGVJVpyroxeneWWWWpyroxeniteWWqb1XWYWqb2XWYWquadranglebWcWWWWquadranglestWuWquartzmWnWoWpWWWWWWWWW W W W W WWWWWWWW7WPW|WWWWquartz-chert-feldspa'W,Wquartz-feldspar}Wquartz-micaWquartz-monzodioritePWquartz-sericiteWWquartziteWquartzitesWquartzose"W)W*WquiteLWradiolariamWnWoWxWyWzWradiolarianWWWWWWWW €APartially to completely recrystallized calcareous phyllites and schists. Protoliths include calcareous sandstones and shales, limestone conglomerates, limestone, volcanic conglomerates and mafic volcanic rocks. Clastics locally preserve turbidite features. Greenschist to transitional greenschist-blueschist metamorphic mineral assemblages. Strong fabric development (S2) by synmetamorphic flattening and (or) mylonitization. Lineation (L2) formed by mineral alignment (amphibole, plagioclase) Bor clast elongation. Similar syn- and post-metamorphic structural history to both overlying schistose units (JTrmb, JTrmvss). Also preserves a pre-metamorphic deformation (D1); pre-metamorphic deformation recorded by tight folds (F1) with axial planar slaty cleavage (S1), both of which are folded by synmetamorphic folds (F2) with noncoplanar foliation (S2). Similarity of protoliths to structurally underlying rocks (Pb, Pvs, Pl) suggests Permian age of protoliths. Metamorphic age constraint€Cs as for JTrmb and JTrmvss. GHG003H540IHagemeister IslandJ MetamorphicK3950€AJTrmbB6Upper Triassic-Lower Jurassic (?) metabasaltic schistsC Early Jurassic (?)-Late TriassicAPartially to completely recrystallized schistose rocks with mafic igneous protoliths, including pillow basalts, angular volcanic breccia, pebbly mudstone, fine tuffaceous sedimentary rocks, diabase, gabbro, and rare chert. Greenschist to transitional greenschist-blueschist metamorphic mineral assemblages. Strong fabric development by flattening and/or synmetamorphic mylonitization (D2). Foliation (S2) moderately to shallowly dipping. Locally developed mineral lineation (plagioclase, amphibl@jurassiclaminatedtuffsandassociatedrocksxVyVzVkanektokWkaronNWOWbWcWdWeWkasiglukWkilbuckWkipchuk W>WEWFWGWIWJWKWkipchukvolcanicfieldandesiteandbasaltflowsEVkipchukvolcanicfieldandesiteflowsFVkipchukvolcanicfieldbasalandesiteflowsGVkipchukvolcanicfieldfine-grainedtuffcrystal-vitrictuffIVkipchukvolcanicfieldlowerblackandesitelithictuffKVkipchukvolcanicfieldrhyolitedomesandflows>VkipchukvolcanicfieldupperblackandesitelithictuffJVkulukak]W^W_W`WpWkuskokwim!W"W#W$W%W&W'W)W*W+W,WWWkuskokwimgroup!Vkuskokwimgroupbasalconglomerate+V scoriaceousZW" schistosecalcareoussiltstonelimestoneandgreenishtuffacVVschistsWWWWWWWWWWWWsummitWWWWW WBWCWDWsurfacemWnWLWsW~WsurfacesaWbWcWdWeWfWgWhWiWjWmWnWoWsurficialJWKWLW^W_WfWgWhWoWsurroundingWWWsusieWWWWWWsyenitic WsynWWWWsynmetamorphicWWWWWWWtalcBWCWDWtallusyW|WtaluswWxWtanGWtaylorWtectoniteWWtemperatureWtentativelyWtephraNWOWbWcWdWeWterminologykWlWterraceMWOWPWQWterraces^W_WfWgWhWoWBWCWEWterraneWtextureTWXWYWWtexturedGWtgrW4WthanXWYWfWiWWW WHWYWWWWWthatzW WWW WIWmWnWoWWW €Bole) and stretching lineation (L2). Sporadically developed crenulation cleavage (S3), often in two sets at 60-90 degrees apart and with opposing microfold asymmetry, suggesting west- to northwest-directed compression. Both D2 and D3 features folded around northeast-trending open folds (D4). Schists cut by unfoliated hornblende gabbro bodies (Jmg) of Middle Jurassic age. Similarity of protoliths to those structurally overlying rocks (Trub, Trud, Trug) suggests Upper Triassic protolith ages.Cb Two mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. Unit bounded by low-angle faults from overlying unfoliated mafic rocks (Trub, Trud, Trug) and from underlying schistose clastic rocks (JTrmvss). Lower fault marked by sporadic serpentinite (su) with gabbro (Trug) and Trondhjemite (Trut) blocks. >FgTwo mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. GGO005H536I Goodnews Bayq€J MetamorphicK3990€AJTrmbB6Upper Triassic-Lower Jurassic (?) metabasaltic schistsC Early Jurassic (?)-Late TriassicAPartially to completely recrystallized schistose rocks with mafic igneous protoliths, including pillow basalts, angular volcanic breccia, pebbly mudstone, fine tuffaceous sedimentary rocks, diabase, gabbro, and rare chert. Greenschist to transitional greenschist-blueschist metamorphic mineral assemblages. Strong fabric development by flattening and/or synmetamorphic mylonitization (D2). Foliation (S2) moderately to shallowly dipping. Locally developed mineral lineation (plagioclase, amphib'Ä*@fÄD|^d @] @ GP@ MARIA A!vuppertriassic-lowerjurassicmetabasalticschistsVVVuppertriassic-lowerjurassicvolcaniclasticschistsVVvalleyPWQWvolcanic_W`WaWpWqWtWuWvWwWyWzW{W|W%W4W=W>W?W@WBWCWDWEWFWGWHWIWJWKWTWUWVWqWrWvW{WWWWWWWWWWWW{tuppertriassic-lowerjurassicmetabasalticschists@volcanicandsedimentaryrocks@vvolcaniclastic@Scenomanian@Eearlyearlycretaceous@Vearlytertiary@jurassicjurassicandjurassic@late@,Dlatecretaceous@+maastrichtian@paleocene@paleoceneandcretaceous@t}chertsTWUWVWvWxWyWzW{WWWWchertyWWWWWWchieflyMWOWPWQWaWbWcWtWuWvWWZWjWkWlWrWtW|WWWW WWW'W,W7WWWchieflyblackporphyriticolivinebasaltincludessomeandes|Vchieflyconsistofinterbeddedgraywackesiltstonewithless'Vchieflyconsistsofconglomeratefaciesofinterbeddedgrayw,Vchieflyfrost-rivedrubblebutlocallyincludessmallamountQVchieflyfrost-rivedrubblelocallyincludesstreamalluviumOVPVchieflyfrost-rivedrubbleloccallyincludesstreamalluviumMVchieflylighttodark-graysiltandsandysiltcontainingabvVchieflymassiveandthin-beddedfine-grainedsiliceousrocksVchieflyreworkedsiltsandysiltandbogdepositsunderlyingaVcVchieflyrhyoliteanddaciteweldedtuffandtuffbrecciaandrVrVrVj600WW W7UWVWW8kWlW8000WaaWbWcWmWnWEWLWXWYWwW|W}W~WWWWW WWWWWWW W'W,W8W9WOW]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWrWWWWWWWWWWWWWWWWWWWWathickmarinesedimentaryunitreferredtoaswearygraywac]V^V_V`VabdWaboutXWYWWaboveaWbWcWWabundanceWW WabundanttWuWvWmWnWoWWWW6WKWTWUWVWvW{W|WWWWWWWabundantsillsanddikescuttingkusandjlninvicinityofmVnVoVabundantlyrWaccessoryXWYWmWnWoWWWW WBWCWDWaccurateWacrossWWW WjurassicWW W6WkWlWmWnWoWrWsWtWuWxWyWzWWWWWWWWWWWWWWWWjurassic-earliestaWbWcWdWeWfWgWhWiWjWjustWWk-arWWW WBWCWDWkWlWWWWWWWWWWWWWWWkanektokWkaronNWOWbWcWdWeWkb7WkcglWkilometerWW WkinegnakWWkinkedWkjc WXWkjvsWkkcd WWWkkmfWkkshWkkv WWklb16WaWbWcWdWeWfWgWhWiWjWjW€Bole) and stretching lineation (L2). Sporadically developed crenulation cleavage (S3), often in two sets at 60-90 degrees apart and with opposing microfold asymmetry, suggesting west- to northwest-directed compression. Both D2 and D3 features folded around northeast-trending open folds (D4). Schists cut by unfoliated hornblende gabbro bodies (Jmg) of Middle Jurassic age. Similarity of protoliths to those structurally overlying rocks (Trub, Trud, Trug) suggests Upper Triassic protolith ages.Cb Two mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. Unit bounded by low-angle faults from overlying unfoliated mafic rocks (Trub, Trud, Trug) and from underlying schistose clastic rocks (JTrmvss). Lower fault marked by sporadic serpentinite (su) with gabbro (Trug) and Trondhjemite (Trut) blocks. >FgTwo mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. GHG003H536IHagemeister Islandq€J MetamorphicK3990€AJTrmbB6Upper Triassic-Lower Jurassic (?) metabasaltic schistsC Early Jurassic (?)-Late TriassicAOriginally shown as part of unit KJvs by Hoare and Coonrad (1978), unit shown as described by Box (1985) with hornfels from Hoare and Coonrad (1978) added. Partially to completely recrystallized schistose rocks with mafic igneous protoliths, including pillow basalts, angular volcanic breccia, pebbly mudstone, fine tuffaceous sedimentary rocks, diabase, gabbro, and rare chert. Greenschist to transitional greenschist-blueschist metamorphic mineral assemblages. Strong fabric development by fBYpartiallytocompletelyrecrystallizedschistoserockswithVpartlyWWpatternWW€Blattening and/or synmetamorphic mylonitization (D2). Foliation (S2) moderately to shallowly dipping. Locally developed mineral lineation (plagioclase, amphibole) and stretching lineation (L2). Sporadically developed crenulation cleavage (S3), often in two sets at 60-90 degrees apart and with opposing microfold asymmetry, suggesting west- to northwest-directed compression. Both D2 and D3 features folded around northeast-trending open folds (D4). Schists cut by unfoliated hornblende gabbro bCodies (Jmg) of Middle Jurassic age. Similarity of protoliths to those structurally overlying rocks (Trub, Trud, Trug) suggests Upper Triassic protolith ages. Two mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. Unit bounded by low-angle faults from overlying unfoliated mafic rocks (Trub, Trud, Trug) and from underlying schistose clastic rocks (JTrmvss). Lower fault marked by sporadic serpentinite (su) with gabbro (Trug) and Trondhjemite (Tr€Dut) blocks. FgTwo mica separates yield Late Jurassic K-Ar ages, probably resulting from Late Jurassic thermal event. GHG002H1536IHagemeister IslandJ MetamorphicK3990MHFS€AJPvssB?Permian-Jurassic (?) volcaniclastic sandstone and conglomerate CJurassic (?)-PermianAUnit distinguished only near Goodnews Bay. Characterized by round cobble conglomerate, entirely composed of plagioclase phyric volcanic clasts, alternating with turbiditic sandstone-shale sequences. Distribution suggests it unconformably overlies Permian (?) basalt (Pb) and Permian (?) volcaniclastic units, and is structurally overlain by schistose rocks with similar protolith (JTrmvss) on its southeastern flank. Structural fabric becomes more prominent to southwest, apparently grading intBo JTrmvss unit. Intruded by pyroxenite and hornblende gabbro bodies on and adjacent to Susie Mtn., which give Middle Jurassic K-Ar amphibole ages. F#Middle Jurassic K-Ar amphibole agesGGO005H532partialrWpartially WaWbWcWdWeWfWgWhWiWjWmWnWoWxWyWzWWWWWWWWWWWWWWpartiallyrecrystallizedschistoserockswithsandstoneshalVVpartiallytocompletelyrecrystallizedcalcareousphyllitesVVpartiallytocompletelyrecrystallizedschistoserockswithV7serpentiniteserpentinizedduniteandwebsteriteultramaficVVserpentinite-matrixNWserpentinizedWWWWWsetsWWWseveralWWW WxWyWzWWWWWWseveralhundredfeetofvolcanicbrecciaatornearbaseofVseverely=W>Wsf1mWnWoWsf2mWnWoWshadowWWshaleWWWWW W!W$W%W&W)W*W+W2W3W6WKW[W\WWWWWGP#   P## €I Goodnews BayJ SedimentaryK3991€AJPvssB?Permian-Jurassic (?) volcaniclastic sandstone and conglomerate CJurassic (?)-PermianAUnit distinguished only near Goodnews Bay. Characterized by round cobble conglomerate, entirely composed of plagioclase phyric volcanic clasts, alternating with turbiditic sandstone-shale sequences. Distribution suggests it unconformably overlies Permian (?) basalt (Pb) and Permian (?) volcaniclastic units, and is structurally overlain by schistose rocks with similar protolith (JTrmvss) on its southeastern flank. Structural fabric becomes more prominent to southwest, apparently grading intBo JTrmvss unit. Intruded by pyroxenite and hornblende gabbro bodies on and adjacent to Susie Mtn., which give Middle Jurassic K-Ar amphibole ages. F#Middle Jurassic K-Ar amphibole agesGHG003H532IHagemeister IslandJ SedimentaryK3991€AJTrmvssB4Upper Triassic-Lower Jurassic volcaniclastic schistsC Early Jurassic (?)-Late Triassic:jt|jtrmbjtrmcjtrmvssjtrpwjumjvc[jvsZkb5kcg1kcgckcggЂт҂قkcglkcgvՂkiLMkicc kick kihdkincPkjbXkjbaSkjcRkjvsTUVv{kk!kkbc+kkcd)*kkcf"kkmc$kkmf#kks',kksh&kkv%klb6klg7ks-./0kslHkspNktr=kts2389kug kus kuvBCDkv4kvk1Gkvk2Kkvk3Fkvk4Jkvk5Ikvk6Ekvkr>kvs:mdmmdvmzpzmzpzamzpzbmzpzcmzpzmmzpzpmzpzsmzpzvnmpbÂpckpclpcmYqc qd12;=>?qes)*+qfqg789WlithologywWlittleZWlittoral-W.W/WlobeaWbWcWdWeWfWgWhWiWjWlocalwWxWyW|W1W5W]W^W_W`WpWsWtWuWWWWWlocallyOWPWQW^W_WfWgWhWoWtWuWvWKW}WZW`WrW}W~WWWWWWWWWWWWWWWWWWWWWWWWmfiningkWlWflankWWWWWWflat-lyingAWflat-lyingtogentlydippingmaficflowsofandesiteandbasAVflats^W_WflattenedWflatteningWWWWWWWflood-plainQWWWXWYW\WaWbWcWflood-plainalluviumsandgravelandbouldersbeachsandandWVXVYV\VfloorPWQWflowwWxW}WBWCWDWEWGWmWnWoWWflowagemWnWoWflowsNWOWPWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWpWqWsWyWzW{W|W8W9W=W>W?W@WAWBWCWDWEWFWGWHWLWMWSWTWUWVW[WqWvW{WWWWWWWWWWW4<€AWeakly to strongly foliated metabasalt having variable recrystallization to greenschist-facies assemblage of albite-epidote-chlorite-actinolite. Interbedded sequences of thin-bedded, white to green metachert having white mica-rich laminae. Mid-ocean ridge chemical (REE) affinities.F|Metamorphic cooling constrained to Late Jurassic or Early Cretaceous time based on K/Ar age of 146.0+15.0 Ma from actinoliteGBH002H5240IBethelJ MetamorphicK5239€ADOsBSchist and metachertCDevonian(?) to Ordovician(?)DMassively bedded green amphibole and chlorite schist interbedded with metachert; overlain by crystalline limestone, phyllite, and minor amounts of chlorite, graphite, and quartz-sericite schists.GBH004H35240IBethelJ MetamorphicK5239€APlB LimestoneCPermianDjThin, widespread, fine-grained, crystalline limestone. Fetid odor. Generally tuffaceous, locally cherty.GGO002H140I Goodnews BayJ SedimentaryK5730€APlB LimestoneCPermianalignmentWWalkaliXWYWalkali-olivinePWQWalkalicNWOWUWVWWWbWcWdWeWfWalkalicbasaltofahzwiryukbluffnubblymottledflowsandpfValkalicbasaltofkaronlakecinderconesflowsandtephranNVOVdVeValkalicbasaltofkaronlakecinderconesflowsandtephrarbVcVall@WWalluvialBWFW^W_WfWgWhWlWmWnWoWpWWW Walluvialssandgravelandsiltalongmajorstreamsandriver^V_ValluviumMWOWPWQWWWXWYWZW[W\W^W_WaWbWcWwWxWyW|WWalluviumincludessomebeachdepositsZV[ValmostBWCWDWaWbWcWdWeWfWgWhWiWjWWWWW<reeWreferred]W^W_W`WpWregardedXWYWregion}WWrelatedWrelationshipWrelativelyWWrelativelyhomogeneousunitoffinelyfoliatedandcrenulateVrelictWreliefvWreplacedaWbWcWdWeWfWgWhWiWjWWWWWWplpvpvspzcspzmgqqaqalqb$%&'(/TXYqc qd12;=>?qes)*+qfqg789Ä3q?@ABCDEFGÄ3rHIJKÄ3vLMÄ6!NOÄ6APÄ9CRÄ9SÄ9TUVÄ9WÄ9XÄ:YÄAZ҂ÄB1[ÄBA\ÄBa]^_`ÄBbabcdefghijÄBcklÄCAmnopÄCeqrÄCfstuvÄCqwÄD!xyz{ÄD