Copyright 1984-2001 FileMaker, Inc. HBAM2016AUG95HPro 5.0'{brownish-gray@metamorphic@sshaleandsandstoneexposedinthenorthwestbairdmountains@E |@b@F€@€W@€\@d22ACI B!F#K$A%C&"F(K)b*n+w,B-D.N/B0G1L2R3W4A5C67'A98H;Y<A=C>C?H@MA@CB: KEAFCGD FIKJ_KmLvMBNDONPBQGRLSQTVUAVCW XH KZ B[F\Y H^Y_A`CaCbJcPd@fe] FhKi_jmkvl}mBnDoFp2rqFsKtQuVv[w`xByg@YHBAM3016AUG95@]101CWDW]WWCWDWEWFWGWHWSWTWUW541BWEWZW;W<W=WKWLWMWNWOWPW542RW?W@W572FWW*W+Wda ABdg;LMNOdhfHIJKCWDWEWFWGWHWdhf101CVDVEVFVGVHVdlPQdmu?@RW>?W@WIJKWLWMWNWOWPWdmu541KVLVMVNVOVPVdmu542RV?V@VdnSTdob!doc"UVdpcgndpcmWXdpcscABWYZW[\QRSWTWUWdpcsc101SVTVUVdpcsc541BVZVdpcsmdpsCW]Wdps101CV]Vdsc ^dsq _`abcdejcsjdabfghijklVjdkkg9mnonomnono4albite-richBWZWamblerMWamblersequenceMVamountsGWCW]WamphiboliteAWfWgWhWiWjWkWlWandAWBWCWGWHWPWQWTWUWVW_W`WeWlWrWuWW@WCWDWRW]WfWgWhWiWjWkWlWangayuchamAWfWgWhWiWjWkWlWangayukaqsraqfWFWkAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGAR004H2009I Ambler RiverJ MetamorphicK5133AKs&F!    $IH Pro 5.0 - 5.5 A  BC:\Program Files\Claris Corp\Claris\ USENGLSH.MPRCC:\Program Files\Claris Corp\Claris\USER.UPRLJ D^"M1,,./: AM PM AMYyTtNnFfNFMPROCOMSP^SundayMondayTuesday WednesdayThursdayFridaySaturdayJanuaryFebruaryMarchAprilMayJuneJulyAugust SeptemberOctoberNovemberDecemberQ1Q2Q3Q4 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter,  , X5 Y}#% u*o44/4/2008@AGECLASS DESCRIPTIONFOSSILLABEL MAP UNITNSACLASS NSAMOD QCLASS QUADRANGLE RADIOMETRIC AGE ROCK CLASS SOURCE UNIT NAME            DAMap unitB A Unit nameB AAgeB GM QuaternaryA DescriptionB GAFossilB ARadiometric ageB ASourceB GMJU011EAClassB  A QuadrangleB GMJuneauuu `@@@A Layout #1@@2A Layout #2@@ APrinter@@AImporter@@A Long view@@$ABig text@@Atomskey@@ATable @@A Description @@A GSA color @@ANora's @@A Age table @@AQ-code@@ADominant@@AArea selection@@A Rock ages          A Layout #1B$$$$@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PM  A Rock classB GMUnconsolidated ANSAclassB  ALabelB  ANSAmodB GAQclassB GsA Layout #2B @*A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PM PD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PM I $,.YesNo/,  , : AM PMJ  K  L  M  N  O  P  Q  R  S $,.YesNo/,  , : AM PMT  U $,.YesNo/,  , : AM PMV  W $,.YesNo/,  , : AM PMX    A)J)*;-I:<M?gLNQ@^^B 1#*0 2C5>C DU GET Vh  YEf l}oO}  C U YJ Rock classK QuadrangleLSourceMRadiometric ageNFossilO DescriptionPAgeQ Unit nameRMap unitTClassVNSAclassXNSAmod @B#"{@B#"{@A0 0B#"{@      @@B s@ A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PM RC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PM UH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PM A%xx%%hh%%XX%%HH% %8  8%  Bj%   %F   X @BBA              6    qAPrinterB%$$$$@A   $,.YesNo/,  , : AM PMB   $,.YesNo/,  , : AM PMC   $,.YesNo/,  , : AM PMD   $,.YesNo/,  , : AM PME   $,.YesNo/,  , : AM PM  PF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PM K $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM  N  O  P  Q  R  S  T  U  V  W  X  Y[ $,.YesNo/,  , : AM PM] $,.YesNo/,  , : AM PM _ $,.YesNo/,  , : AM PMb $,.YesNo/,  , : AM PMd $,.YesNo/,  , : AM PMe  gh $,.YesNo/,  , : AM PMi  j $,.YesNo/,  , : AM PM A$q6&54g<qN"=4JiTqf"UQbilt"m.zjv'KkBv='oDyVD1Rqbytc8qp qn  EW7  GT+j Cc(uq  gtz(p  ~ +# b.`"c<$D  /co%-+j& '/1=(/ =&)/=*MLabelNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap uniteNSAmod'A "i. @B#"{@  B#"{@AB !BB#"{@         "         " rAImporterB%$$$$@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PM PF   $,.YesNo/,  , : AM PMG   $,.YesNo/,  , : AM PMH   $,.YesNo/,  , : AM PMI   $,.YesNo/,  , : AM PMJ   $,.YesNo/,  , : AM PM K   $,.YesNo/,  , : AM PML   $,.YesNo/,  , : AM PMM   N  O   P   Q   R   S   T   U   V   W   X   Z  $,.YesNo/,  , : AM PM[  \ $,.YesNo/,  , : AM PM]  A$V0S$&3K1U=R1$=J?WKT?:KLNViNZKlYxVl5xNB{XU{M+dp, eqs,  t%1,  &2 CBN, CR3?, 3B R^, /S_}~~XvxMClassNQclassONSAclassP Rock classQ QuadrangleRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unit[NSAmod]Label @B#"{@B#"{@A8 8B$#"{@             !#sA Long viewB%$$$$@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PM! I $,.YesNo/,  , : AM PMJ  K  L  M  N  O  A+<.I<=N1@HMQ2T=a} : ( B' Bj  ?} XJ Rock classK QuadrangleLSourceM DescriptionN Unit nameOMap unit @   B#"{@B#"{@A B#"{@   &(rABig textB@% @9A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PM$ PF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PM#% KK $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM  N  O  P  Q  R  S  T  U  V  W  X  $& A6qH85FgNq`"O4\ifqx"gQti~t4'.jAw^(BLOlBfw(erpz2rz9qq0n    !+.j%" C)r  )q   MLabelNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unit @B#"{@B#"{@A0 0B#"{@            79AtomskeyB @A $,.YesNo/,  , : AM PMB  O $,.YesNo/,  , : AM PMP  U $,.YesNo/,  , : AM PMV  YZ $,.YesNo/,  , : AM PM") PF $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PM(* K $,.YesNo/,  , : AM PMM N O P Q R S T U V W X Y[ $,.YesNo/,  , : AM PM] $,.YesNo/,  , : AM PM_ $,.YesNo/,  , : AM PM)+ b $,.YesNo/,  , : AM PMfg $,.YesNo/,  , : AM PMi $,.YesNo/,  , : AM PMj kl $,.YesNo/,  , : AM PMm $,.YesNo/,  , : AM PM*, n $,.YesNo/,  , : AM PMopq $,.YesNo/,  , : AM PMr s $,.YesNo/,  , : AM PMt $,.YesNo/,  , : AM PMu v $,.YesNo/,  , : AM PM+- aw $,.YesNo/,  , : AM PMx y $,.YesNo/,  , : AM PMA$q7n$%8e<qO";$OgTqg"RMfhlt"i }iv'Ek,. Bv='oDdWDX\b_ubvV qn  EX  DX  mCbv1  aubv ~. f 2d"+ &. '-/ DI\%) I]*br +f0 , ~.  -/{ . ;   ;/ ; C, E0F'120'38'4|5('6bow7b=vh8cv,9 MLabel.0 jNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unitA&AjNSAmod+A!"#o Description0A(*+-r Minimum ageu Maximum agexQclass @B#"{@B#"{@AJ  $%&'),./0JB#"{@      .0  "# !  *-(+' @@$B s@A $,.YesNo/,  , : AM PM/1 RB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PM02 RG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PM13 RL $,.YesNo/,  , : AM PMN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMQ $,.YesNo/,  , : AM PM24 RR $,.YesNo/,  , : AM PMS $,.YesNo/,  , : AM PMT $,.YesNo/,  , : AM PMU $,.YesNo/,  , : AM PMV $,.YesNo/,  , : AM PM35 W $,.YesNo/,  , : AM PMX $,.YesNo/,  , : AM PMY $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PM46 A)x x))hh))XX))HH))8  8)  B) )F  F) ))'') ))))57 C )) B  B)   )   ) }  @BBA2 2                      .06' Q#!"-(*+9;oATableBB% @A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PM'8 A)R)/@2I@}GX JMX{lY njBMap unitPClassVNSAclassA @BBAB  BE A DescriptionB_ @A $,.YesNo/,  , : AM PMff̙B C $,.YesNo/,  , : AM PMff̙D E $,.YesNo/,  , : AM PMff̙F G $,.YesNo/,  , : AM PMff̙H I $,.YesNo/,  , : AM PMff̙J 8< pH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ  K  L  O  P  Q  R  S $,.YesNo/,  , : AM PMT  V $,.YesNo/,  , : AM PMW  X;= Y $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PM[ $,.YesNo/,  , : AM PM\ $,.YesNo/,  , : AM PM]  <> A)I)*=-H:QbTpactfIsL^O7]| B/@ 3I@ #  K" ar dNr|U;1 B=? C ju'qJ Rock classK QuadrangleLSourceO DescriptionPAgeQ Unit nameRMap unitTNSAclassWClassA]label @B#"{@Bt#"{@A* *B#"{@   @@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?A RH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PM@C M $,.YesNo/,  , : AM PMA%JJ%%MM%  %  % %  %/  /%z z%  B%j j%%Z @BBA   C:                 AB C  GIs A GSA colorB  @8A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PM:F  K $,.YesNo/,  , : AM PMff̙L M $,.YesNo/,  , : AM PMff̙N O $,.YesNo/,  , : AM PMff̙P Q $,.YesNo/,  , : AM PMff̙R S $,.YesNo/,  , : AM PMff̙T VEG  A6PK6 IEHPtLH [E{OL{+D5JJ5HQ F B1  0 T0  .I9s<"5O7ELg5/AFD  Cm]  m]m] ~BMap unitD Unit nameFAgeHSourceJClassL QuadrangleNNSAclassP DescriptionR descriptionTsourcesVMain @BfBA. .B     XZ ANora'sBB @ A $,.YesNo/,  , : AM PM̙B C $,.YesNo/,  , : AM PM̙D E $,.YesNo/,  , : AM PM̙F G $,.YesNo/,  , : AM PM̙H I $,.YesNo/,  , : AM PM̙J DJ P F $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMIK  K $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM N O P Q R S T U V W X Y[ $,.YesNo/,  , : AM PM] $,.YesNo/,  , : AM PMJL  _ $,.YesNo/,  , : AM PMb $,.YesNo/,  , : AM PMfg $,.YesNo/,  , : AM PMi $,.YesNo/,  , : AM PMj kl $,.YesNo/,  , : AM PMKM  m $,.YesNo/,  , : AM PMn $,.YesNo/,  , : AM PMopq $,.YesNo/,  , : AM PMr s $,.YesNo/,  , : AM PMt $,.YesNo/,  , : AM PMu LN a v $,.YesNo/,  , : AM PMw $,.YesNo/,  , : AM PMx A$q7$%8e<qO";$OgTqg"RMfhlt"i }iv'EkMO  Bv='oDdWDX\b_ubvV qn  EX  DX  mCcw4  bwdw#  bv ~. f   2d "+ &NP  D.  'I\%) I]*br +f0 !, ~. !-/{ !. ;   ;/ ;E E. 0G(120(38(4|5((6cnv7b6va8 MLabelOQ m NNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unitA&AjNSAmod+A"#$o Description0A)+,.r Minimum ageu Maximum agexQclass @B#"{@B#"{@fAJ  !%&'(*-/0JB#"{@       /  #$ "! +.),( @@B s@A $,.YesNo/,  , : AM PMPR R B $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PMQS R G $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PMRT R L $,.YesNo/,  , : AM PMM $,.YesNo/,  , : AM PMN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMSU R Q $,.YesNo/,  , : AM PMR $,.YesNo/,  , : AM PMS $,.YesNo/,  , : AM PMT $,.YesNo/,  , : AM PMU $,.YesNo/,  , : AM PMTV U V $,.YesNo/,  , : AM PMW $,.YesNo/,  , : AM PMX $,.YesNo/,  , : AM PMY $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PMUW  A)x  x) ){ {) )k k) )[ [) )K   K)   B)  )Y   Y) )   )gg))**)))VX  C8)   )  )   ) E  E)   )   @BBfA4 4                   WH    /$"#).+,\^s A Age tableBB   @A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH[  K $,.YesNo/,  , : AM PM̙L  A(7&ff*:*>8ff<L <JJff_o _Lmffq qF fBjfM[ O\]} 3XBSourceDClassFNSAclassHNSAmodJMap unitLQclass @BBfA Z\  B   @@B s@A $,.YesNo/,  , : AM PM̙B $,.YesNo/,  , : AM PM̙C $,.YesNo/,  , : AM PM̙D $,.YesNo/,  , : AM PM̙E $,.YesNo/,  , : AM PM̙[Y  F $,.YesNo/,  , : AM PM̙A,W W    p  p , @BBfA     ehp AQ-codeB   @@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMY_ p H $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ  K  L  O  P  Q  R  S $,.YesNo/,  , : AM PMT  V $,.YesNo/,  , : AM PMW  X^`  Y $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PM[ $,.YesNo/,  , : AM PM\ $,.YesNo/,  , : AM PM]  _a  A)I)*=-H:QbTpactfIsH B/@ 3I@ #  K" @Q CQQUY8. \?m`b  C\mg]rn$qJ Rock classK QuadrangleLSourceO DescriptionPAgeQ Unit nameRMap unitTNSAclassWClassA]label @B#"{@Bt#"{@A* *B#"{@  @@B s@A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMac R C $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMbd R J $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PMM $,.YesNo/,  , : AM PMN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMcf  P $,.YesNo/,  , : AM PMA%JJ%%B  B% % %P P%%  %   %  B% %% @BBA   f]                  de C  }r ADominantBB   @A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PM]i P F $,.YesNo/,  , : AM PMG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMhj  K $,.YesNo/,  , : AM PML $,.YesNo/,  , : AM PMM N O P Q R S T U V W X Y[ $,.YesNo/,  , : AM PM] $,.YesNo/,  , : AM PMik  _ $,.YesNo/,  , : AM PMb $,.YesNo/,  , : AM PMfg $,.YesNo/,  , : AM PMi $,.YesNo/,  , : AM PMj kl $,.YesNo/,  , : AM PMjl  m $,.YesNo/,  , : AM PMn $,.YesNo/,  , : AM PMopq $,.YesNo/,  , : AM PMr s $,.YesNo/,  , : AM PMt $,.YesNo/,  , : AM PMu km x v $,.YesNo/,  , : AM PMw $,.YesNo/,  , : AM PMx yfz $,.YesNo/,  , : AM PMf{ $,.YesNo/,  , : AM PMf| $,.YesNo/,  , : AM PMfln M } $,.YesNo/,  , : AM PMf $,.YesNo/,  , : AM PMfA$q7$%8e<qO";$OgTqg"RMfhlt"i }iv'Ekmo  Bv='oDdWDX\b_ubvV qn  EX  DX  mCcw4  bwdw# bv ~. f 2d"/A &np  D1?'I\%) I]*Ef +Hj]!, H[ !-G\}!. ;   ;/ ;E D- 0O(126(3<(4}5)(6cnv7b6va8- or  F90]1:1;`1< 1=1? 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  ` $,.YesNo/,  , : AM PMA)x  x) ){ {) )k k) )[ [) )K   K)   xz  B)  )Y   Y) )  )g g) )* *) ) )8 C8) ) ) s  s)  ) c  c)   ) S  S)   )   ) a y}  DD a)   @BBfA> >                      /24356$"#.khs@Ytrcs@area@carbonaceous@conglomeratesandstoneandshale@group@kanuyutconglomerate@marbleoftheschistbelt@metasedimentaryandmetavolcanicrocksundivided@+paragneiss@rocksofthehammondrivershearzone@Xterrane@jurassic@middleandlatedevonian@,paleozoicandproterozoic@0.5@1982@age-diagnostic@ages@all@amphibole@wand@Dandalusite@!area@assemblage@basin@ebelt-central@blackweatheringfinetomediumgrainedblackmetaquartzite@brachiopods@@pelitic@protoliths@quadrangle@quartz-rich@resemble@siltsone@similar@stretching@those@tuff@volumetrically@wiseman/chandalar@bryozoans@corals@fine@mollusks@cs002@ christian@ k }gHYACBGM~KBFK_mv}ACE@jCHMRW\AC@ @BkA@An@AEA @A A @J @BF BE@B AI@=E@@A@CE,C/AG2B4AE6G9D ;A <@ ?@@EBCIECFAFHAEJA ELA$F#MF%NF&OF'RB*SA.T@-UA0E/WC1XA4F3ZA6E5\A:E9^B=E<`A@F?bzg $ )+,AArea selectionB  @A $,.YesNo/,  , : AM PMfB  C $,.YesNo/,  , : AM PMfD  E $,.YesNo/,  , : AM PMfF  G $,.YesNo/,  , : AM PMfH  I $,.YesNo/,  , : AM PMfJ  g pH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ  K  L  O  P  Q  R  S $,.YesNo/,  , : AM PMT  V $,.YesNo/,  , : AM PMW  X ?Y $,.YesNo/,  , : AM PMZ $,.YesNo/,  , : AM PM\ $,.YesNo/,  , : AM PM]  ^ _  A)I)*=-H:QbTpactfIsH B/@ 3I@ #  K" @Q CQQUx<2 {?) C {0*q__r_`rJ Rock classK QuadrangleLSourceO DescriptionPAgeQ Unit nameRMap unitTNSAclassWClassA]label^ Rocktype1_ Rocktype2 @B#"{@Bt#"{@A. .B#"{@   @@B s@A $,.YesNo/,  , : AM PM RB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PMF $,.YesNo/,  , : AM PM RG $,.YesNo/,  , : AM PMH $,.YesNo/,  , : AM PMI $,.YesNo/,  , : AM PMJ $,.YesNo/,  , : AM PMK $,.YesNo/,  , : AM PM M $,.YesNo/,  , : AM PMA%JJ%%B  B%  %2 2%%  % %z  z% Bj%jj%X @BBA      ~             sA Rock agesB   @?A $,.YesNo/,  , : AM PMB $,.YesNo/,  , : AM PMC $,.YesNo/,  , : AM PMD $,.YesNo/,  , : AM PME $,.YesNo/,  , : AM PM~ uK $,.YesNo/,  , : AM PMfL  M $,.YesNo/,  , : AM PMfN  A+ E)0C 3cAH[ KMY`s cNqx  {[  KB  X   fB QuadrangleDUTMF N_latitudeH S_latitudeJE_longLW_longNState @BBA B       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 $,.YesNo/,  , : AM PMf C(:6  (:(:%  (: >9s& BqT BV BT B=To "w9( &D{<$ '$%) $*<) +? !,  !-  !. ;   ;/ ; Ar131f3qE"2-DgHqZ"FQXh^s![(mht%GiBs$ld$4$\(a:(8:X qn  $  $ cMLabelNNSAclassO Quadrangle P Rock classQClassRSourceSRadiometric ageTFossilU DescriptionVAgeW Unit nameXMap unitA&A/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` $,.YesNo/,  , : AM PMf A'x  x' '{ {' 'k k' '[ [' 'K   K'   B'  'Y   Y' '   'gg''**''' z @BBfA@ @         '    ' p    p' Dv   ' 3    3' ~   @ @BBfA@ @         U                  /"$#)+,.23456 7  A9FPTHRPTH NAME WSPCMARI FPTHADATA:Databases:nsalith.FP5MARIA nsalith.FP3 NAMEA nsalith.FP5 RPTHA NSALITH.FP5 WSPCAE:\Databases\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\ A1 RPTH RolyNAME WSPC NAMEA nsakey.FP5 RPTHA NSAKEY.FP5 RolyAWSPCA E:\E.1\DB-5\ A1 RPTH RolyNAME WSPC NAMEA nsakey.FP5 RPTHA NSAKEY.FP5 RolyAWSPCA E:\E.1\DB-5\ A1 RPTH RolyNAME WSPC NAMEA nsakey.FP5 RPTHA NSAKEY.FP5 RolyAWSPCA E:\E.1\DB-5\ ? RPTHA NNSAKEY.FP5 WSPCAD:\Databases\ !@A!VDEF(LIST8LISTA8Sedimentary Igneous Metamorphic Unconsolidated Tectonite8VDEFA((FMRLA  A/FMRLFMRLAA6FMRLFMRLA A7FMRLFMRLA A9FMRLFMRLA A?FMRLFMRLAA:FMRLFMRLA  A?FMRLFMRLA   A<FMRLFMRLA   AQFMRLFMRLA AkeyBrefsClithDdescripEageFqkeyGdomlithHMaplabelJAreaK Radiometric`  A1 $RPTHRolyNAMEWSPC NAMEAAlaskaquads.fp5RPTHAALASKAQUADS.FP5RolyAWSPCA E:\E.1\DB-5\ A1LRPTH RolyNAME WSPCNAMEA SBradio.FP5 RPTHA SBRADIO.FP5 RolyAWSPCAE:\E.5\Schistbelt\FP5\A1 fRPTH RolyNAMEWSPC NAMEA SBdescrip.FP5RPTHA SBDESCRIP.FP5 RolyAWSPCA E:\E.1\DB-5\ !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`k!ARock class ListB Nsamods list`@   A?FMRLFMRLA  A/FMRLFMRLAA6FMRLFMRLA A@FMRLFMRLA A9FMRLFMRLA A?FMRLFMRLAA?FMRLFMRLA   A<FMRLFMRLA   AQFMRLFMRLA AkeyBrefsClithDdescripEageFqkeyHMaplabelJAreaK Radiometric``ClithDdescripEageFqkeyGdomlithHMaplabelJAreaK Radiometric`70SunMonTueWedThuFriSatJanFebMarAprMayJunJulAugSepOctNovDecrArialSystemFujiyamaExtraBold Lucida FaxTimes New Roman Helvetica MS Sans SerifLucida HandwritingLucida Calligraphy Arial Narrow Verdana Times Tahoma Courier @  f $ LA1 RPTH RolyNAME WSPCNAMEA SBrefs.FP5 RPTHA SBREFS.FP5 RolyAWSPCAE:\E.5\Schistbelt\FP5\A9FPTHRPTH NAME WSPCMARI FPTHAROCKET2:Databases:nnsakey.FP5MARIA nnsakey.FP3 NAMEA nnsakey.FP5 RPTHFP3 NAMEA nnsakey.FP5 RPTH RPTHE Pro 2.0 - 2.1kAFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E5Marine mollusks of Late Early Cretaceous (Albian) ageGWI007H2091IWisemanJ SedimentaryK2180|EF BD  D I A CCHA FK_AC BFKACI B!F#K$A%C&"F(K)b*n+w,B-D.N/B0G1L2R3W4A5C67'A98H;Y<A=C>C?H@MA@CB: KEAFCGD FIKJ_KmLvMBNDONPBQGRLSQTVUAVCW XH KZ B[F\Y H^Y_A`CaCbJcPd@fe] FhKi_jmkvl}mBnDoFp2rqFsKtQuVv[w`xByDzandJWZW[W_WeWsWW@WDWRW^WWWWWWWW>W?W@WIWJWKWLWMWNWOWPWcambrianuW5WcarboniferousRWtW7WcretaceousFW/rW9:mnopWqWrWsWtuvwxy{|}~#WXYcretaceoustodevonianrVcretaceoustojurassicFVpVqVrVsVdevonianAWEWJW OWPWQWSWZW[W]W_WaWbWrWsW;W@WAWBWCDWHWIWJWKWLMNOPQRWSTUWVWWWXWYWZW[W\W]^W_`abcdefWgWhWiWjWkWlWWWW>W?W@WABCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWdevonianandsilurianJV^VdevoniantoordovicianaVdevoniantoproterozoicEVOVPVQVAVBVWVXVYVZV[V\VQVRVSVTVUVearlyAWfWgWhWiWjWkWlWVWearlyjurassictodevonianAVfVgVhViVjVkVlVVVVA{d,BjurassicAWFWRWSWfWgWhWiWjWkWlWpWqWrWsWVWjurassictocarboniferousRVjurassictodevonianSVlate]W_WW@WHWIWJWKWRW>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWlatedevonian]VHVIVJVKVCVDVEVFVGVHVlowerZWDWWWWlowermississippianandupperdevonianZVDVVVVmesozoicDW8WmesozoictopaleozoicDV8Vmiddle_WbWcWW@WEWRWUWVW9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWdproterozoiceVpaleozoicorproterozoicoVpaleozoictoproterozoicdVpVqVvVwV|VproterozoicEWOWPWQWcWdWeW&nWoWpWqWvWwW|WAWBWEWFproterozoictopaleozoicnVquaternaryxW>quaternaryortertiaryxVsilurianJW uWsiluriantocambrianuVtertiaryxWtoAWDWEWFWOWPWQWRWSWaWbWcWdWnWpWqWrWtWuWvWwW|WAWBWEWtriassictWtriassictocarboniferoustVupperZWDWimetamorphosedAWBWiWFWGWfWgWhWiWjWkWlWtWuWvWwWxWyW{WW*W+WVWWWXWYWmetamorphosedpillowbasalthyaloclasticbrecciabasaltictuAVfVgVhViVjVkVlVVVmetapelitefWFWWWmetaplutonicQWmetaquartziteIWLWQWdWfWkWmWqWwWFW_W`WaWbWcWdWeWWW WWWWmetarhyoliteMWAWBWmetarhyolitesMWAWBWmetasandstoneWWYW\W]W^W`WiWoWGWHWIWJWKWPWQWSWTWWWWW#W*W+W6WCWDWEWFWGWHWmetasedimentaryDWOW_WcWW@WAWBWEWRWYWZW[W\W8W9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWQWRWSWTWUWUWHWIWJWKWPWQWRWSWTW#W6W?W@WCWDWEWFWGWHWmetatuffSWTWmeterFWLW_W`WaWbWcWdWeWpWqWrWsWmetersGWLWMWOWxWAWYW[W\W_W`WaWbWcWdWeWAWBWQWRWtuffAWSWfWgWhWiWjWkWlWVWtuffaceousAWCWfWgWhWiWjWkWlW|W}W~WVWtuffsJW^WtwoEWHWMWOWVWiWrWuWAWBWGWWWXWYWZW[W\WWWW W!W*W+W5WAWBWQWRWSWTWUWZW[W[WypicallyWWpWWW$W%W&WunconformablytW7WundeformedoW#WunderliejWWWunderlyingHWWW W!W"Wundifferentiated[WunitAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWWW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWW@WAWCWDWEWFWGWHWIWJWKWPWQWRWUWVWWWXWYW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWW W W WWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W(W)W*W+W5W6WA AzHHzA@Gould H - HP LJ 5M (lj5m1)4C odXXLetterDINU"4A1 BA{d8H2069ntarycksK90459045d,ubunitelt $u@Gwi amblerriverbairdmountainsbettles chandalar christianhughes selawik asswisemanÄbDÄf6 Äf ÄtÄtqÄtvÄzSÄz6HÄz8?ÄzRÄzUÄ&Äa;Äq Ä-_Ä0ÄYÄZÄr. amblerriverÃ!>Ä*ÄZb2ÄaÄbVÄfq*ÄfvÄsÄtÄt1Ät9ÄzÄz&Äz6Äz8ÄzbÄz!"Äz3Äz(ÄF,ÄQ#ÄREÄ ÄAÄBÄf%ÄV<Äq=Ä&FbairdmountainsÄ2Ä59ÄaÄx15Äya+Äz6JÄz8)ÄaNÄaÄ[Ä"$Äc wisemanÄEÄz8^ÄaL shungnakÄzÄzbPÄ]Äc  christianÄtB'Äw ÄzTÄz%DÄz6IÄz8@Ä ÄaOÄqÄrÄ`Ä1Ä surveypassÃF8Ä7!:Ä7a/Äa4Äz6KÄz8GÄzbQÄzVÄCÄaMÄ6ÄbÄ\ÄcWÄ67  chandalar ÄcX bettles  @7RA @7RARAn|AMzPzsB SerpentiniteCMesozoic? to Paleozoic?AGreenish-gray, yellowish-green, olive green or greenish black serpentinite, minor basaltic rocks, harzburgite tectonite, and nephrite jade exposed in the southern Ambler River and adjacent Shungnak quadrangles. In the Cosmos Hills fault-bounded serpentinite bodies sit above metasedimentary rocks of the Schist belt and below basalt of the Angayucham terrane (JDab) and Cretaceous metasedimentary rocks (Ks). In the Jade Mountains, in the southwestern Ambler River quadrangle, serpentinite is mBixed with subordinate basaltic rocks, dunite, peridotite, and nephrite jade, and occurs adjacent to a thick sequence of basalts of the Angayucham terrane (JDab). This unit is part of the Angayucham terrane.GSH005H2073I Shungnak J MetamorphicK3498ADpCmB#Metamorphic rocks, Mosquito terraneCDevonian to Proterozoic?nak J MetamorphicK3498ADpCmB#Metamorphic rocks, Mosquito terraneCDevonian to Proterozoic? K88520€/AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GCH004H2040I Chandalar J SedimentaryK100N1000€0AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GCS004H2040I Christian J SedimentaryK100N1000€1AQsB)Surficial sedimentary deposits, undivided(C-locallyCWHWIWJWOWXW\W]WbWdWjWlW{WAWBWHWIWJWKWLWMWNWOWSWTWUWVWYWZW[W\W^W|W}W~W WWWWWW W!WQWRWSWTWUWZW[WlowBWFW~WpWqWrWsWtWuWvWwWxWyW{W,W-W.W/W0W1W2W3W4WWWXWYWlowerPWQWZW\W]WtWHWIWJWKWSWTWWW7Wm]WfWgWHWIWJWKWW WmaPWmade{WLWMWNWOWmaficAWBWCWFWHWKWLWOWQW]WeWnWAWBWFWHWIWJWKWYWZW[W\W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWWW W!W'W(W)WQWRWSWTWUWVWWWXWYWZW[W\W]Wmagnetite-bearingPWPWPWgPWgPWWxWWmayGWJWNWWWmW|W^WmediumMWmWqWmedium-beddedGWmedium-grainedGWmedium-grayXWmegacrystsMWmegafossilsAWIWXWbWUWVWmeta-argilliteiWkWGWfinegrainedtoconglomeraticgreywackeandfine-grainedlamCV|V}V~Vfine-grainedCWHWaWjWpW|W}W~WWWWW W!W$W%W&WZW[WfinelyoW#WfinerBWtWuWvWwWxWyW{WWWXWYWflaggy-beddedaWflat-lyingxWflat-lyingvesicularolivinebasaltflowsexposedinthesouxVflatteningBWtWuWvWwWxWyW{WWWXWYWflowMWAWBWflowsxWfluvial~W,W-W.W/W0W1W2W3W4WfoliatedAWBWHW]WnWHWIWJWKWfWgWhWiWjWkWlWtWuWvWwWxWyW{WWW W!W'WCWDWEWFWGWHWVWWWXWYWZW[W[W[W[W[W[WKW^WfossilsBWGWWWtWuWvWwWxWyWzW{WWWfound{WLWMWNWOWfourWWWWfromAWBWFWIWLWOWPWZWoW{WAWBWDWLWMWNWOWYWZW[W\W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyWzW{WWWW#WWH8moreCWQW|W}W~WCWDWEWFWGWHWmosquitoEWWWXWmostIWMWPWWWWWAWBWmostlyoW#WmounttW7Wmountain{WLWMWNWOWmountainsDWIWSWUWVWXWZW[WbWcWeWfWjW|W}WUWVWWWWW W WWWWWWW8W9W:Wmountains/amblerFWpWqWrWsWmtfWWmudstoneCWHWRW|W}W~WWW W!WZW[WmultipleaWmuscovite{WLWMWNWOWmyloniticEWZWoWWWXWWW#WmzpzgyWzWnanielikXWbWUWVWnearMWfWWAWBWnelson`WnephriteDW8WnooW|W#Wnoatak[WDWWnorth-centralRWnortheastEWuWWWXW5WnortheasternBWXWZWbWcWfWgWjWtWUWVWtWuWvWwWxWyW{WWWW WWW7W9W:WWWXWYWYWYWbWgWjWtWUWVWWWW WWWnorthwesternmostrWnotvWDWWWoccurAWKWMW\WfWFWSWTWfWgWhWiWjWkWlWWW(W)Wn,AKJmBMelangeCCretaceous to Jurassicschist, metabasite, minor felsic orthogneiss and meta-ultramafic rock exposed in two small areas along the Kobuk fault zone in the northeast Bettles and southwest Chandalar quadrangles. The rocks exhibit amphibolite-facies metamorphic assemblages, mylonitic foliations and well-developed stretching lineations. Age and affinity of the protolith rocks is unknown. This unit is part of the Mosquito terrane.F'54.8 +/- 1.3 Ma white mica cooling age GWI006H2008IWiseman J MetamorphicK8852AKJmBMelangeCCretaceous to JurassicERadiolarians, conodontsGBM004H2092IBaird Mountains K5145-quadrangleAWDWFWIWMWNWPWRWSWTWUWVWWWXWZW[WbWcWfWjWkWlWpWqWuWvWwWxWyWzW{W|WLWMWNWOWUWVWfWgWhWiWjWkWlWmWnWoWpWqWrWsWWWWWWW WWWWWW$W%W&W5W8W9W:WAWBWVWDWEWHWKWWWYWcWdWeWgWhWnWoWtW}WWWXWtWuWvWwWxWyWzW{WWWWW W W WWWWWWWWWWWWWW W!W"W#W'W(W)W7W8W9W:Wquandrangles`W6WquartzBWCWGWLWMWWWYWmWyW{WCWLWMWNWOW]W_W`WaWbWcWdWeWmWnWoWtWuWvWwWxWyWzW{W|W}W~WWWWW WAWquartzchertquartziteandslate-clastconglomeratewithminWVVVquartzconglomeratequartzitemetasandstonephylliteshaleaYVVVquartz-albite-oligocvWWquartz-albite-oligocschistwithstauroliteandandalusiteevVVquartz-micadWWW ERadiolarians, conodontsGBM004H2092IBaird Mountains J MetamorphicK5145ADpsB!Wacke and lesser amounts of shaleCDevonianADominantly gray-green lithic wacke, lesser brown quartz wacke, and black shale and silty shale exposed in the eastern map area. Wackes are fine- to medium-grained and thin to medium-bedded. Black shale forms up to 50 percent of the unit and occurs in layers up to 15 meters thick. The unit may be 1200 meters thick. Localities east of the map area yielded Late Devonian plant fossils and spores that are of Middle or Late Devonian and probable Early Devonian age. May be correlative to partB8s of unit Pzpg. This unit is part of the Phyllite belt.&GCS004H2083I Christian J SedimentaryK6900APzpgBPhyllite and graywackeC Paleozoic?Baird Mountains fATectonic assemblage of meter to kilometer-scale fault slivers of pillow basalt, mafic schist, metagabbro, metalimestone, metachert, metagraywacke, phyllite, and rare serpentinite exposed in low hills in the south central and southwestern part of the map area. Metamorphic grade varies from slice to slice and ranges from pumpellyite to greenschist-facies; relict igneous clinopyroxene is present in some metagabbros. One sliver of mafic schist on the Baird Mountains/Ambler River quadrangle boBcundary contains abundant blue amphibole, probably crossite. This unit is part of the Phyllite belt.Q]#collectedAWfWgWhWiWjWkWlWVWcombinedSWcommonCWQWWW]WHWIWJWKW|W}W~WWWcommonlyAW\WbWhWSWTWUWVWfWgWhWiWjWkWlWWWWWWWSWTWUWVWcomplexitySWcomposedWWiWGWWW*W+WWW W!W"WcompositionsHWWW W!W"Wconcretions\WSWTWconformablyRWconglomerateBWRWSWTWWWYW^WcWiWtWDWEWGWPWQWtWuWvWwWxWyWzW{WWWWWW*WconglomerateandfinergrainedsedimentaryrocksthatgradeBVtVuVvVwVxVyVzV{VconglomeraticCW|W}W~WconglomerteZWWWconodontsAWIWfWgWhWiWjWkWlWconsistsRWSW\WtWSWTWconsistsinascendingorderofdevonianmarinesedimentaryrSVconsistsofmetasandstoneandmetasiltstonewithsubordinate\VSVTVconstitutesLW_W`WaWbWcWdWeWcontactNWmWqW{WLWMWNWOW WWcontacts{WLWMWNWOW78=cs004P]cin0HJPhu004ks}3X[se005dx1Q\sh005L^ejry|2RVWsp004  '1@DIOT`fqu $'-;?AEMSZwi007$)+59JN[agv  #%*.7<>@BDNTTTTTTTNTTNTTTTNTTNTTYÄ1Z Ä1cRÄ1f)GÄ1gSTÄ1h5Ä1rÄ1sÄ1tBZÄ1v-Ä1w,Ä1x<Ä1yFÄ1z!8Ä13Ä1Ä1Ä1Ä1Ä12Ä1Ä1CÄ1 Ä1'Ä1 Ä1Ä1DÄ1Ä1Ä1 amblerAWIWJWMWNWTWWWYWmWnWpW{WWHWRWSWUWYWZWamblerriverAVIVJVMVNVTVWVYVmVnVpV{VVHVRVSVUVYVZVbairdBWFWHWLWSWUWVWXWZW[W\W]W^W_WaWbWcWeWfWhWjWlWrWsW|W}W~WAWBWEWFWbairdmountainsBVFVHVLVSVUVVVXVZV[V\V]V^V_VaVbVcVeVfVhVjVlVrVsV|V}V~VAVBVEVFVbettlesXchandalar/4678:CGKMQVW AThin-bedded to massive dolostone, metalimestone, and marble, locally graphitic or phyllitic exposed in fault slices in the Cosmos Hills. Minor thin, micaceous layers interpreted as airfall tuffs, and some buff to reddish gray dolostones thought to be of hydrothermal origin (Hitzman and others, 1982). Some intervals are fossiliferous and may represent biohermal build-ups. Hosts the copper-rich Ruby Creek (or "Bornite") and associated stratabound sulfide deposits. This unit is part of the CoBsmos Hills sequence.EYConodonts, brachiopods, gastropods, crinoids, tabulate and rugose corals, stromatoporoidsGAR004H2084I Ambler River J MetamorphicK5525 9 APzpcB Carbonate rocks of Phyllite beltC Paleozoicg greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thoseB in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GBM004H2007IBaird Mountains J MetamorphicK5560 APzpcB Carbonate rocks of Phyllite beltC Paleozoicv6similarHWtWwWWW W!W7WZW[WsimilaritiesbWUWVWsinglekWWsitDW8Wsize{WLWMWNWOWskarnNWPW{WLWMWNWOWskarn-bearingNWskarns{WLWMWNWOWslateTWVWWslate-clastWWWWsliceFWpWqWrWsWslicesJW^WsliverEWFWpWqWrWsWsliversAWFWfWgWhWiWjWkWlWpWqWrWsWVWslopes~W,W-W.W/W0W1W2W3W4WsmallEWHWSWUWVWZWfWmWFWWWXWWWWWW WWW W!WZW[WsmalleroW#Wsn{WLWMWNWOWsomeAWFWJWNW^W_WbWtW{WW@WLWMWNWOWPWQWUWVW^WfWgWhWiWjWkWlWpWqWrWsW7W>WIWJWVWsouthFWfWwWpWqWrWsWWsouth-centralCW|W}W~Wsouth-southwestyWtyWtyWbleQWstaurolitevWstraddlingpWstrainedoWstrataNWbWUWVWstrataboundJW^WstratifiedBWtWuWvWwWxWyWzW{WstratigraphicallySWstretchedWW  ADsqBQuartz-mica schistCDevonianAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick  > APzsgB Mafic schistC PaleozoicDGreen and greenish-gray schistose to massive irregularly-shaped bodies and lenses of mafic rocks in units Dsq and DPsc large enough to show at the scale of the map occur in the Survey Pass and Chandalar quadrangles. This unit is part of the Schist belt.GSP004H2006I Survey Pass ntervals are fossiliferous and may represent biohermal build-ups. Hosts the copper-rich Ruby Creek (or "Bornite") and associated stratabound sulfide deposits. This unit is part of the CoBsmos Hills sequence.EYConodonts, brachiopods, gastropods, crinoids, tabulate and rugose corals, stromatoporoidsGAR004H2084I Ambler River J MetamorphicK5525 APzsgB Mafic schistC PaleozoicDGreen and greenish-gray schistose to massive irregularly-shaped bodies and lenses of mafic rocks in units Dsq and DPsc large enough to show at the scale of the map occur in the Survey Pass and Chandalar quadrangles. This unit is part of the Schist belt.GSP004H2006I Survey Pass $intrusiveBWCWNW{WLWMWNWOWtWuWvWwWxWyW{W|W}W~WWWXWYWironUWironstone\WSWTWirregularly-shapedKW(W)W\W]WisAWBWCWDWEWFWGWHWIWJWKWMWNWQWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWyW{WW@WCWFWGWLWMWNWOWPWQWRWUWVWWWXW]W^WfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWW W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWVWWWXWYWZW[W\W]W]W]W]WW7WAWBWjadeDWIW8WjcstW7WjdabDW8WjurassicAWSWfWgWhWiWjWkWlWVWk-feldspar{WLWMWNWOWkanayutRWDWWkarentW7WkarlSWsWXW;coralsIWJWNWXWYW^W`WaWbWPWQWUWVW^WWW*W+W6WcoralsbrachiopodscrinoiddebrisconodontsIVcoralsstromatolitesconodontslatestmerameciantoearlychXVcretaceousBWCWtWuWvWwWxWyW{W|W}W~WWWXWYWcrinoidIWVWhWWWWWWWWcrinoidaltW7WcrinoidsJWYW^WWWcrinoidsbrachiopodscoralsforaminifersgastropodsmolluscaYVVVdebrisIWNWTWVWYWZW\WDWSWTWWWWWWWdevonianMW\W]W^W_WgWhWW@WHWIWJWKWPWQWRWSWTW WWWWWWW>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWPWWearly-earlyhWWWWWWWechinodermNWTWVWYWZWDWWWWWWWechinodermdebrisbrachiopodsmolluskscephalopodsandplantTVZVDVVVVechinoderms\W]WHWIWJWKWSWTWemsian-eifelianhWWWWWW F>Youngest detrital zircon population at one locality 370-360 MaGBM004H2000IBaird Mountains J MetamorphicK8602 ADaBAmbler sequenceCDevonianAInterlayered white to medium gray weathering metarhyolite, dark green weathering metabasite, pale gray weathering marble, and brown to dark gray weathering calcareous, pelitic and carbonaceous schist exposed in two areas in the Schist belt. "Metarhyolite porphyries" with megacrysts of feldspar up to 5 cm across and quartz quartz eyes up to 1 cm across are typical of the unit. "Aphanitic metarhyolite" layers and lenses are characteristic and show rare flow banding, breccia textures, and poEOne conodont of Devonian ageFU-Pb zircon ages from metarhyolite layers 378-386 Ma, bimodal igneous zircon population about 378 and 405 Ma from Arctic deposit. GAR004H2004I Ambler RiverK7260C B2are typical of the unit but volumetrically minor.  G2brownish-grayLW_W`WaWbWcWdWeWWbuffJW^Wbuild-upsJW^WbutAWLWNW\WtWSWTW_W`WaWbySW^W_WpWsWuWW@WFWPWQWcalc-silicatePWcalcareousLWMW]W_W`WdWeWfWgWpWqWW@WFWHWIWJWKWRW_W`WaWcalcite{WLWMWNWOWcanuWcarbonaceousMWUWlWcarbonateIWNWcWEWcarbonate-andBWZWcarbonate-richOWAWBWYWZW[W\WcarboniferousSWcentimeterLW_W`WaWcentralFWNWPWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqW{WW@WFWGWLWMWNWOWPWQWRWUWVWchandalarEWHWKWbWcWjWoWtWvWxWyWzW{WLWMWNWOWUWVWWWXWcharacteristicMWchertAWCWRWSWTWVWWWXWsWchertyAWtWchieflybWUWVWchloritePWWW{WLWMWNWOWclasticuWclastsBWCWWWclinopyroxeneFWcmMWcoarsedW{WLWMWNWOWcoarsecrystallinemarbleorangedolomiticmarblequartz-micdVcoarse-crystallineNWcoarselyhWcoevalbWUWVW EOne conodont of Devonian ageFU-Pb zircon ages from metarhyolite layers 378-386 Ma, bimodal igneous zircon population about 378 and 405 Ma from Arctic deposit. GAR004H2004I Ambler RiverJ MetamorphicK7260APzsmBMarble of the Schist beltC PaleozoicAMetacarbonate rocks that form an elongate belt in the central Ambler River quadrangle and are the only mappable occurrence of carbonate strata in the Schist belt. Unit surrounds the Redstone pluton and includes a variety of rock types. White, gray, and black, fine- to coarse-crystalline marble predominates. Local occurrence of garnet-epidote skarn in marble adjacent to granite (Dg) indicates intrusive relation between pluton and some parts of Pzsm, but other Pzsm lithologies, including theBv Devonian metalimestone, may be in fault contact with the skarn-bearing marbles. This unit is part of the Schist belt.dEAConodonts, corals, stromatoporoids, spines, and echinoderm debrisGAR004H2087I Ambler River J MetamorphicK7215Csc Bssible welded shard textures. Metabasites occur as pods and lenses; exposures in the Ambler River quadrangle retain remnant pillow structures. Near the Ambler River Survey Pass quadrangle boundary, where it has been studied in the most detail, the unit is thought to be 700-1,850 meters thick ; there, massive sulfide deposits are associated with the metarhyolites, including the world-class Arctic deposit. This unit is part of the Schist belt.eNassemblageFWeWpWpWqWrWsWWWWW$W%W&WassemblagesEWPWQWZWbWUWVWWWXWWWassigned^W`WPWQWassociatedJWMWzW^WAWBWSWTWUWatBWKWLWOWPWWWXWaWuW{WAWFWLWMWNWOWYW[W\W_W`WaWbWcWdWeWtWuWvWwWxWyW{WWWW(W)W5WQWRWWWXWYW\W]WavailableoW#WbairdFWSWUWVWXWZW[WaWbWcWeWfWjW|W}WUWVWpWqWrWsWWWWW W WWWWWWW9W:WbandingMWAWBWbasaltAWDWFWrWxWfWgWhWiWjWkWlWpWqWrWsW8WVWbasaltlimestoneandtwobeltsofmelangeexposedinthenorrVbasalticAWDWfWgWhWiWjWkWlW8WVWbasaltsDW8WbaseBWtWuWvWwWxWyW{WWWXWYWYWYWgWhWiWjWkWlWmWnWoWpWqWvWwW|WW@WAWBWCWFWGWPWQWRWUWVWYWZW[W\W]W_W`WaWbWcWdWeWpWqWrWsWV)interlayeredwhitetomediumgrayweatheringmetarhyolitedaMVAVBVinterlayers\WSWTWintermediateCW|W}W~WKWLWMWNWOWPWinterpillowAWfWgWhWiWjWkWlWVWinterpretedJWtW^W7WintervalsJWUW^WintoSWuW5W+marbleoftheschistbeltNVmelangepqrsmetachertAWfWgWhWiWjWkWlWSWTWUWVWmetaigneous_WW@WRW>W?W@WIWJWKWLWMWNWOWPWmetaintrusiveAWfWgWhWiWjWkWlWVWmetalimestoneAW`WPQfWgWhWiWjWkWlW6WVWmetamorphicEWdWfWFWWWXWWWWmetamorphicrocksmosquitoterraneEVWVXVmetamorphicrocksofmtangayukaqsraqfVVmetamorphicrocksofmtangayukaqsraqremetamorphosedFVVmetamorphicrocksoftheernielakeareadVVmetasedimentaryYW_WeWgWiWkWpWqWW@WGWRWWW WWWWWWW$W%W&W*W+W>W?W@WIWJWKWLWMWNWOWPWmetasedimentaryandlessermetaigneousrocks_VV@V>VIVJVmetasedimentaryandlessermetaigneousrockscalcareousironRV?V@Vmetasedimentaryandlessermetaigneousrocksvolcanic-rockbKVLVMVNVOVPVVOVPVVVcontainIWQWaWmWEW W;W<W=WSWTWUWcontainsBWFWHWPWSWiWjW{WGWLWMWNWOWRWpWqWrWsWtWuWvWwWxWyW{WWWWW W!W?W@WKWLWMWNWOWPWSWTWUWWWXWYWZW[WcontroloW|W#Wcopper-richJW^WcoralsIWXWcoreuW5WcorrelativeGW|WKWLWMWNWOWPWcosmopolitanbWUWVWVWVWCWdevonianAWGWIWNWSWdgNWdhf[WdiabaseAWdikes]Wdisplay]WdistributedZWdmuSWdn[WdobbWdocumentedUWdolomiticPWdolostoneIWJWRWTWXWaWbWdolostonesJWdominantlyGWLWdominantlygray-greenlithicwackelesserbrownquartzwackeGVdpscKWdsqKWduniteDWearlyBWGWIWeastGWeast-centralTWeasternGW`WelevatedUWelongateNWelsewhereSWendicottRWSWenoughKWequivalentSW[WespeciallyaWetivlukRWSWexhibitEWexpanses_WexperiencedaWexposedAWCWDWEWFWGWHWJWMWPWSWUWWWXWZW[W]W_WbW AGray marble, orange dolomitic marble, magnetite-bearing chlorite schist, and pelitic schist exposed in the central Survey Pass quadrangle. Adjacent to the Arrigetch pluton, the unit contains calc-silicate skarn. Mineral assemblages from most of the unit stabilized at albite-epidote-amphibolite facies; exposures southwest of the major orthogneiss bodies are apparently lower in grade. Albite-epidote-amphibolite facies metamorphism peaked at approximately 105 MaGSP004H2048I Survey Pass J MetamorphicK7360ADpCgnBSchist and paragneissCDevonian to Proterozoic?A{Pelitic schist, metaquartzite, mafic schist and other lithologies; gneissic textures are more common where the unit is adjacent to metaplutonic rocks. Mafic rocks within the unit contain assemblages stable in the albite-epidote-amphibolite facies; exposures west of the major orthogneiss bodies appear to be lower in grade. This unit part of the Arrigetch-Igikpak thermal high.{GSP004H2045mheterogeneousOW_WeWoWW@WAWBWRWYWZW[W\WWWWW#W>W?W@WIWJWKWLWMWNWOWPWQWRWSWTWUWheterogeneousassemblageofinterlayeredcalcareousmaficaneVVVVVheterogeneousexpansesofcalcareoussiliceousandvolcanicl_VV@V>VIVJVheterogeneousmixoffinelylaminatedmostlymyloniticlithooV#VhighQWhighwaycW9W:WhillsDWFWJW^WpWqWrWsW8WhitzmanJW^WhomogeneousHWpWWW W!W$W%W&WZW[Whorace{WLWMWNWOWhornblendezW{WLWMWNWOWhornfelszWhostsJWaW^WhughesBWtWuWvWwWxWyW{WWWXWYWYWYWWMWNWPWQWRWSWTWUWVWWWXWYWZW[W]W^W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWtWuWvWwWxWzW{W|W}WBWCWEWFWGWHWIWJWKWLWMWNWOWPWQWUWVWWWXWZW]W^WfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWVprotolithsOWAWBWYWZW[W\WQWRWSWTWUWpumpellyiteFWpWqWrWsWpyroxenezWpzpgGWpzsmNWquadangleiWGW*W+W€DA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `EjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GWI007H2044IWisemanJ MetamorphicK7225j€UALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. These exposures are dominated by metachert (mm-cm scale laminated quartz-rich rock) and calcareous schist, and contain several types of metaconglomerates. The metachert commonly contains cm-scale lenses and thin, mm-thickB layers of spessartine (Mn-rich) garnet or mafic metatuff. Metabasite bodies are associated with the metachert as well. Part of the Schist belt.EbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGCH004H2041I Chandalar J MetamorphicK8608€VAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianKMpeliticEWLWMWPWQWwWWWXW_W`WaWbWcWdWeWAWBWtabasiteminorfelsicorthogneissandmeta-EVWVXVpeliticschistmetaquartzitemaficschistandotherlithologQVpeninsulabWUWVWpercentGWperidotiteDWpg|WphylliteFWGWHWIWSWTWUWVWWWYW\W]W^W`WgWiWjWlWqWtWCWGWHWIWJWKWPWQWRWSWTW]Wphyllitefine-grainedschistandphylloniteofthecentralbjVphylliteorslatesiltsonesandstonelimestoneandchertinVVphylliticJWkW^WphylloniteHWjWpillowAWFWMWplantBWGWplatyLWhW_W`WaWbWcWplugsHWplutonNWPW{WLWMWNWOWplutons{WLWMWNWOWpodsMWpoorjWpoorlyBWoWporphyriesMWporphyroblastic{WLWMWNWOWpossibleIWMWXWpreciseIWprecludesSWpredominantlyCWpredominatesNWprehnite-pumpellyiteBWpresentFW{WLWMWNWOWpreserved\W{WLWMWNWOWSWTWprimaryAWprobableGWprobablyFWproterozoic}WprotolithEWWWXWnAMcpB)Carbonaceous chert and siliceous phylliteC MississippianDBlack carbonaceous metachert and siliceous phyllite exposed in a small area in the northwestern Baird Mountains quadrangle. Massive iron sulfide intervals with elevated silver and other metal values have been documented.E"conodonts, Devonian-Mississippian GBM004H2071IBaird Mountains J MetamorphicK6200AMklB0Kayak Shale of Endicott Group and Lisburne GroupC MississippianDPhyllite or slate, siltsone, sandstone, limestone, and chert in two small exposures in the northwestern Baird Mountains quadrangle and in a larger area in the Survey Pass quadrangle. EOstracodes, brachiopods, bryozoans, and echinoderm debris, conodonts, crinoid, bryozoan, and coralline debris, brachiopods, gastropods, sponge spicules, endothyrid foraminifersGBM004H2061IBaird Mountains J MetamorphicK63284AMcBQuartz-rich conglomerateCMississippian?e GroupC MississippianDPhyllite or slate, siltsone, sandstone, limestone, and chert in two small exposures in the northwestern Baird Mountains quadrangle and in a larger area in the Survey Pass quadrangle. EOstracodes, brachiopods, bryozoans, and echinoderm debris, conodonts, crinoid, bryozoan, and coralline debris, brachiopods, gastropods, sponge spicules, endothyrid foraminifersGBM004H2061IBaird Mountains J MetamorphicK6328AMcBQuartz-rich conglomerateCMississippian?he northwestern Baird Mountains quadrangle and in a larger area in the Survey Pass quadrangle. EOstracodes, brachiopods, bryozoans, and echinoderm debris, conodonts, crinoid, bryozoan, and coralline debris, brachiopods, gastropods, sponge spicules, endothyrid foraminifersGBM004H2061IBaird Mountains J MetamorphicK6328AMcBQuartz-rich conglomerateCMississippian?Endicott Group and Lisburne GroupC Mississippian:vAKsB"Conglomerate, sandstone, and shaleC Cretaceousentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EYSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GSP003H2038I Survey PassJ SedimentaryK1990vAKsB"Conglomerate, sandstone, and shaleC CretaceousvstretchingEWWWXWstrikeHWWW W!WZW[WstromatolitesXWstronglyBW]WHWIWJWKWtWuWvWwWxWyW{WCWDWEWFWGWHWWWXWYWstructuralSWstructuresMW\WSWTWAWBWCWDWEWFWGWHWstudiedMWAWBWstylewWsubmarineCW|W}W~WsubordinateCWDW\WcWhWwWEWSWTW|W}W~WWWWWWW8W9W:W;W<W=WsubunitHWiWGWWW W!W*W+WKWLWMWNWOWPWZW[WsubunitsHWWW W!WZW[WsuccessionTWtW7WsuggestingZWWWsulfideJWMWUW^WAWBWsurroundsNWsurveyKWMWPWVWWWYWZW`WcWdWgWnWpWWWWWWWW WW$W%W&W'W(W)W6W9W:WAWBW\W]Wtailleur6WtanfW{WLWMWNWOWWtantograyweatheringequigranulartoporphyroblasticfine{VLVMVNVOVOVOVOVOVWpWqWrWsWtWuWvWwWsicAW;bryozoansAWVW`WfWgWhWiWjWkWlWW*W+W6WVWburrowsRWtW7WcephalopodsRWTWZW`WDWWWW6WchancelloridcWEW9W:W;W<W=WchesterianXWcolonial^WPWQWcolumnalshWWWWWWWconodontMW0$%&AWBWconodontsAWFWIWJWNWOWSWUWVWXW\W]W^W_W`WaWbWcW%hWkWrWsWtWuWW@WAWBWEWHWIWJWKWPWQWRWSWTWUWVWYWZW[W\W^WfWgWhWiWjWkWlWpWqWrWsWWWWWWWWW*W+W5W6W7W9W:W;W<W=W>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWpackstoneburrowsandtracetVconodontsgraptolitesradiolarianscoralsgastropodsbryozoa`Vconodontssilicifiedtwo-holecrinoidcolumnalsoflateearlhVconodontsstromatolitesprotoconodontschancelloridscleritecVEVconularids`WcoralkWsWcorallineVW"fineOWAWBWYWZW[W\WQWRWSWTWUWforaminifersAWRWSWVWYWsWtWfWgWhWiWjWkWlWWWW7WVWforaminiferscephalopodsspongespiculesandradiolariansbuRVfossilsBW\WtWSWTWtWuWvWwWxWyW{W7WWWXWYWfragmentsTWYWZWkWsWDWWWWWWWfrasnian]WgWHWIWJWKW WCWDWEWFWGWHWHWteBWCW\W]W^W_WgWhWW@WHWIWJWKWlatedevoniansomefamennianconodontsbrachiopodsechinoder\Vlatemiddletoearlylatedevonianconodontsandmegafossils^VlatestXWlimestonesWlithostrotionidXWmarineBWCWmarinemollusksoflateearlycretaceousalbianageCVmegafossilsAW^W_WrWW@Wmegafossilsandconodontsaremiddleandearlylatedevonian_VV@VmeramecianXWmeramecian-earlyXWmicrofossilsuWmicrofossilsbrachiopodstrilobitesgraptolitesconodontsuVmid-famenniansWmiddle]W^W_WgWhWW@WHWIWJWmolluscanYWAQuartz- , chert-, quartzite-, and slate-clast conglomerate with minor thin layers of metasandstone and phyllite exposed in the Ambler River, Survey Pass, and Wiseman quadrangles. Quartz and chert clasts are most common; chert clasts are varicolored. The matrix of the conglomerate is composed of quartz, white mica, and chlorite, and clasts are typically stretched. Phyllite may be gray, green, or red. Rocks included in the unit resemble Kekiktuk Conglomerate of Brosg and others (1962), Band lack any age-diagnostic fossils. Kyanite has been identified in at least four exposures of the unit in the Survey Pass quadrangle. This unit is part of the Central belt.GAR004H2077I Ambler River J MetamorphicK6360 1APzZbB,Metasedimentary rocks of Bluecloud Mountain CPaleozoic to Proterozoic?A2Light, medium, and dark gray phyllite, dark gray to black metaquartzite, dark gray and grayish-brown calcareous phyllite, and reddish-brown weathering impure marble exposed in fault-bounded lenses along the Schist belt-Central belt contact in the Wiseman quadrangle. This unit is part of the Central belt.2GSP004H2002I Survey PassJ MetamorphicK86042AMzDmB9Igneous and sedimentary rocks of the Maiyumerak MountainsCCretaceous? to DevonianDBasalt, limestone, and two belts of melange exposed in the northwesternmost part of the map area. This unit is part of the Maiyumerak sequence.EConodonts and megafossilsGBM004H2076IBaird Mountains J TectoniteK4951seman quadrangle. This unit is part of the Central belt.2GSP004H2002I Survey PassJ MetamorphicK8604siltsoneVWWsiltstoneRWZWtWDWWWW7WsiltyGWaWCW]WsilurianIWbWUWVWsilurian-earlyIWsilverUWAMlBCarbonate rocksC MississippianA%Light- to medium-gray weathering, dark-gray metalimestone and dolostone with locally abundant layers and lenses of black chert; megafossils (mainly silicified) include corals and possible stromatolites exposed at one locality in the Nanielik antiform, northeastern Baird Mountains quadrangle. %E}Corals, stromatolites, conodonts (latest Meramecian to early Chesterian), Meramecian-early Chesterian lithostrotionid corals GBM004H2027IBaird Mountains J MetamorphicK6320AMuB Metasedimentary rocks, undividedC MississippianDQuartz conglomerate, quartzite, metasandstone, phyllite, shale, and metalimestone in the Ambler River, Survey Pass, and Wiseman quadrangles.ECrinoids, brachiopods, corals, foraminifers, gastropods, molluscan and echinoderm debris, possible bryozoan, pelecypod, brachiopod, ostracode fragments, foraminifersGAR004H2062I Ambler River J MetamorphicK6365AMDkBKanuyut ConglomerateBKanuyut ConglomerateexposuresMWPWQWSWTWVWWWaWoW{WBWDWEWLWMWNWOWZWWWWW#W;W<W=WAWBWSWTWUWextendsOWAWBWYWZW[W\WQWRWSWTWUWextrusiveBWtWuWvWwWxWyW{WWWXWYWeyesMWAWBWfaciesPWQWZW\WaWFWSWTWWWWfanCW|W}W~WfaultAWEWFWJWNWWWXW^WfWgWhWiWjWkWlWpWqWrWsWVWfault-boundedDWIWTWqWW8Wfault-boundedblocksofmarblemetalimestoneanddolostonetIVfe-ti{WLWMWNWOWfeldsparMWAWBWfelsicEWWWXWKWLWMWNWOWPWferruginousRW?W@WfewZWfWFWWWWWfineCWGWNWhWkWmW{WLWMWNWOW|W}W~W WWWWWWWWWagesIW}W W WairfallJW^WakiakBWZWalbiteLW{WFWLWMWNWOW_W`WaWbWcWdWeWWalbite-epidoteFWWalbite-epidote-amphiPWQWalbite-micaLW_W`WaWbWcWdWeWalbite-richBWZWmountsCWmWamphiboleFWaWamphibolitefWamphibolitemetaquartzitecalcareousschistmetapeliteandafVamphibolite-faciesEWanAWNWandAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWmWnWoWpWqWrWsWtWuWvWwWyWzW{W}W~WW@WAWBWandalusitevWangayuchamAWDWangayukaqsraqfWantiformXWbWtWuWBWanyWWaphaniticMWapparentlyPWappearQWapproximatelyPWarcticMWareBWCWGWHWIWJWLWMWNWOWPWQWWW\W]WaWbWfWoW{WAWBWareaAWFWGWUWVWZWhWkWnWrWtWwWareasEWMWZWjWargillaceousRWaWsWtWargilliteiWaroundfWarrigetchPWarrigetch-igikpakPWQWasJWLWMWSW_WbWfWW@WascendingSWfquartz-richLWOWoWpWAWBWYWZW[W\W_W`WaWbWcWdWeW#W$W%W&WQWRWSWTWUWquartziteTWWWYWZWoWtWDWWWWWWWW#W7WquartziteconglomeratephyllitemetalimestoneslatedolostonTVquartzitepebblyquartziteconglomerateandminorsiltstoneDVVquartzitepebblyquartziteconglomerteandminorsiltstoneeZVVVquartzitephyllitesiltstoneconglomerateshalesandstonelitV7VquartzosecWEW9W:W;W<W=WradiolarianAWfWgWhWiWjWkWlWVWradiolariansAWfWgWhWiWjWkWlWVWrangeBWIWyWtWuWvWwWxWyW{WWWXWYWYWWWreddishJW^Wreddish-brownqWredstoneNWregionallyBWtWuWrelationNWrelations{WLWMWNWOWrelativelyoWpWrelativelyhomogeneousassemblagedominatedbylightgreenispVrelictFWpWqWrWsWremnantMWremnants{WLWMWNWOWreportedIWZWrepresentCWJW^Wrepresents[WgmollusksBWCWSWTWZW]W^WcWDWEWHWIWJWKWPWQWtWuWvWwWxWyW{W|W}W~WWWW9W:W;W<W=WCWDWEWFWGWHWWWXWYWmonoplacophorancWEW9W:W;W<W=WofBWCWMWOWcWhWAWBWEWYWZW[W\WtWuWvWwWxWyW{W|W}W~WWWWWWW9W:W;W<W=WAWBWQWRWSWTWUWWWXWYWoneMWAWBWoneconodontofdevonianageMVAVBVorgW Worthocone`W6WostracodeYWWWostracodesVWWostracodesbrachiopodsbryozoansandechinodermdebrisconodVVVpackstonetW7W7W7WspongeOWRWVWsteinkernscWstromatolitesOWXWcWstromatoporoidsJWNW^WaWbWhWsWstromatoporoidsbrachiopodspelmatozoanbryozoanandcoralfsVtabulateJWtoBWXW]W^Wtrace\WtracesRWtrilobiteshWtwo-holehWar004 -.0bm004 !"#%&(*,23ch004/EJEchinoderm debris, brachiopods, mollusks, cephalopods, and plant fragmentsGBM004H2028IBaird Mountains J MetamorphicK6915AMDeBEndicott Group, undividedCMississippian and DevonianDShale and sandstone exposed in the northwest Baird Mountains quadrangle. Represents undifferentiated parts equivalent the Hunt Fork Shale (unit Dhf), the Noatak Sandstone (unit Dn) and the Mississippian Kayak Shale (part of unit Mkl). GBM004H2074IBaird Mountains J SedimentaryK6300ADnBNoatak SandstoneCDevonianA1Consists of metasandstone and metasiltstone with subordinate interlayers of green, gray, and maroon phyllite and local ironstone concretions. Semischistose textures and minerals indicative of lower greenschist facies metamorphism occur locally, but original sedimentary structures are commonly preserved. 1EzLate Devonian (some Famennian)conodonts, brachiopods, echinoderms, gastropods, pelecypods, plant debris, and trace fossilsGBM004H2056IBaird MountainsJ MetamorphicK6900C'Lower Mississippian? and Upper DevonianAQuartzite, pebbly quartzite, conglomerte, and minor siltstone. Exposed in a few small areas of northwestern Baird Mountains quadrangle, northeastern Ambler River quadrangle, and widely distributed in northern Survey Pass quadrangle. Semischistose and mylonitic textures and mineral assemblages suggesting lower greenschist facies metamorphism reported mainly from western part of map area.kanuyutconglomerateZVVVkanuyutconglomerateandnoataksandstoneDVVkayakTWVWWkayakshaleofendicottgroupandlisburnegroupVVVkekiktukTWkekiktukconglomeratekayakshaleofendicottgroupandlisbTVkivivikSWlakedWWlesserGW_WW@WCWRW]W>W?W@WIWJWKWLWMWNWOWPWlisburneTWVWWmaficAWKWnWfWgWhWiWjWkWlW'W(W)WVW\W]WmaficmetavolcanicandmetaintrusiverocksmetachertmetalimAVfVgVhViVjVkVlVVVmaficschistKVnV'V(V)V\V]VmaiyumerakrWmarbleNWPW(fresembleWWWWresistantLW_W`WaWbWcWdWeWretainMWAWBWrichBWlWBWZWtWuWvWwWxWyW{W WWWXWYWridges~W,W-W.W/W0W1W2W3W4W4WWzWsadlerochittWsandstoneHWRWSWVW[WsWtWsandstoneshaleargillaceouslimestonelimestonedolostonemRVsandysWscaleKWSWscalesLWOWscatteredLWschistAWDWEWFWHWKWLWMWNWOWPWQW`WdWfWjWmWnWoWpWqWvWwWzW{W|WschistoseKWkWschistswWscvstWsectionSWoWsedimentaryAWBWSW\WuWsedimentsAWsegregationmWsemipeliticLWsemischistoseZW\WseparatelySWsequenceDWJWSWrWsWsequencesuWsericite{WserpentiniteDWFWseveralSWTWaW}WsewardbWshaleGWRWSWYW[WtWshaleandsandstoneexposedinthenorthwestbairdmountains[VshardMWshowKWMWmWshowingSWshownSWshubliktWshungnakBWDWsiberianbWsignificant_WsiksikpukRWsilicalWsiliceousUW]W_W`WeWsilicifiedXWsills]WADhfBHunt Fork ShaleC Late DevonianADark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. Locally massive mafic sills and dikes up to 10 m thick are common. Mafic bodies in the unit (both strongly or weakly foliated parts) display lower greenschist-facies minerals.EhBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodontsGBM004H2018IBaird MountainsJ MetamorphicK6925ADlB MetalimestoneCDevonianDMetalimestone and lesser metasandstone, metasiltstone, phyllite, and minor conglomerate. Assigned in part to Beaucoup Formation by some workers. This unit is part of the Central belt.Elate Middle to early Late Devonian conodonts and megafossils (solitary and colonial corals, stromatoporoids, brachiopods, and mollusks)GBM004 ASplB Black phyllite and metalimestoneCSilurianAMBlack siliceous phyllite and metalimestone, metasandstone, metasiltstone, phyllite, and graphitic calcareous schist in the eastern Ambler River and western Survey Pass quandrangles. This unit is part of the Central belt. Originally mapped as the western part of unit MDcp of Nelson and Grybeck (1980), eastern part assigned to 6331afossils and conodonts are Middle and early Late DevonianFnU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocksGBM004H2017IBaird MountainsJ MetamorphicK6927 ASplB Black phyllite and metalimestoneCSilurianAMBlack siliceous phyllite and metalimestone, metasandstone, metasiltstone, phyllite, and graphitic calcareous schist in the eastern Ambler River and western Survey Pass quandrangles. This unit is part of the Central belt. Originally mapped as the western part of unit MDcp of Nelson and Grybeck (1980), eastern part assigned to 6331AvolumetricallyLWfW_W`WaWbWcWdWeWWwackeGW]WCWHWIWJWKW]WCWDWEWFWGWHWwackesGWwaswWweakly]WiWGWHWIWJWKW*W+Wweaklymetamorphosedmetasandstonemeta-argillitephylliteciVGV*V+VweatheringLWMWXWbWfWkWmWnWqW{WLWMWNWOWUWVW_W`WaWbWcWdWeWW WWW'WAWBWweldedMWAWBWwellHWbWUWVWWW W!WSWTWUWZW[Wwell-definedSWwell-developedEWWWXWwell-sortedBWtWuWvWwWxWyW{WWWXWYWwereSWwestQWwest-centralSWwesternAWZW`WaWdWjWlWmWoWpW}WBWZWfWgWhWiWjWkWlWWW W W W WWWW#W$W%W&W6WVWVWVWcoarselycrystallihVVVVVVVwidelyZWWWwisemanHWRWWWYWcWdWeWgWkWoWqWtWuWwW}WWWWW W W WWWWWWWWWW W!W"W#W8!ADObB Baird GroupCDevonian to OrdovicianABeige- to orange-weathering, laminated, partly argillaceous to silty metalimestone and light- to dark-gray, flaggy-bedded to massive metalimestone, marble, and dolostone. The unit hosts several mineral occurrences and metabasaltic rocks of unknown age that are especially abundant in western exposures. These rocks contain fine-grained blue amphibole (crossite) at multiple localities, indicating that the Baird Group has experienced blueschist facies metamorphism. This unit is part of the CeB ntral belt.d light- to dark-gray, flaggy-bedded to massive metalimestone, marble, and dolostone. The unit hosts several mineral occurrences and metabasaltic rocks of unknown age that are especially abundant in western exposures. These rocks contain fine-grained blue amphibole (crossite) at multiple localities, indicating that the Baird Group has experienced blueschist facies metamorphism. This unit is part of the CeB ntral belt.#B*Older carbonate rocks of the Central belt C!Middle Ordovician to Proterozoic?A>Dolostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite exposed in the northeastern Baird Mountains quadrangle, central Survey Pass quadrangle, and along the Dalton Highway in the Wiseman and Chandalar quadrangles. This unit is part of the Central belt.>EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGBM004H2015IBaird Mountains J MetamorphicK7740cosmosDWJW^W8WcreamfWWcreekJWtW^W7WcretaceousBWDWzWtWuWvWwWxWyW{W8WWWXWYWcrinoidIWcropIWcrossiteFWaWpWqWrWsWcrystallinedWhWWWWWWWWcu{WLWMWNWOWOWisIWdeformedBWdepositMWdepositsCWJWMWderivedOWdetailMWdetritusCWdevonianAWGWIWNWSWdgNWdhf[WdiabaseAWdikes]Wdisplay]WdistributedZWdmuSWdn[WdobbWdocumentedUWdolomiticPWdolostoneIWJWRWTWXWaWbWcWdolostonemetalimestonemarbleandsubordinatequartzosemetcVdolostonesJWdominantlyGWLWdominantlygray-greenlithicwackelesserbrownquartzwackeGVdpscKWdsqKWduniteDWearlyBWGWIWeastGWeast-centralTWeasternGW`WelevatedUWelongateNWelsewhereSWendicottRWSWenoughKWequivalentSW[WespeciallyaWetivlukRWSWexhibitEWexpanses_WexperiencedaWexposedAWCWDWEWFWGWHWJWMWPWSWUWWWXWZW[W]W_WbWcW'$APzZemB(Metamorphic rocks of the Ernie Lake areaCPaleozoic to ProterozoicA Coarse crystalline marble, orange dolomitic marble, quartz-mica schist, metaquartzite, calcareous schist, graphitic metaquartzite, and metabasite exposed in eastern Survey Pass and western Wiseman quadrangles. Locally gneissic. This unit is part of the Central belt. F*Protolith intruded by 971 Ma granitic rockGWI007H2012IWiseman J MetamorphicK8611%APzZcmB1Metasedimentary and metavolcanic rocks, undividedCPaleozoic and Proterozoic?DHeterogeneous assemblage of interlayered calcareous, mafic, and siliceous rocks exposed in the central Baird Mountains, Ambler River, and Wiseman quadrangles. This unit is part of the Central belt.E ConodontsGBM004H2046c?DHeterogeneous assemblage of interlayered calcareous, mafic, and siliceous rocks exposed in the central Baird Mountains, Ambler River, and Wiseman quadrangles. This unit is part of the Central belt.E ConodontsGBM004H20466J Metamorphic€9B*Older carbonate rocks of the Central belt C!Middle Ordovician to Proterozoic?A>Dolostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite exposed in the northeastern Baird Mountains quadrangle, central Survey Pass quadrangle, and along the Dalton Highway in the Wiseman and Chandalar quadrangles. This unit is part of the Central belt.>EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGAR004H2015I Ambler River J MetamorphicK7740+XGparagneissQWpartbWUWVWphylliteHWIWUW`W*lW WWW W!W6WZW[WphylliteandgraywackeHVVV V!VZV[Vquartz-micaLW_W`WaWbWcWdWeWquartz-micaschistLV_V`VaVbVcVdVeVquartz-richWWpWWW$W%W&Wquartz-richconglomerateWVVVquartz-richmetasedimentaryrockspV$V%V&VquartzitemW WremetamorphosedFWWrestrictedEW;W<W=WriveroWsW#WrocksAWEWIWJWRWSWXWYW_WbWcWdWeWfWgWiWkWoWpWqWrWtWuWyW|WW@WEWFWGWRWUWVWWWXW^WfWgWhWiWjWkWlWmWnWoWWWWW WWWWWWWW#W$W%W&W*W+W5W7W9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWVWVWVWVWVWWaleBWGWTWVW]WCWHWIWJWKW]WshearoWsiliceousUWlWsubunitBWZWsurficial~Wsurficialsedimentarydepositsundivided~VWsdaltoncW9W:WdarkHWLWMW]WgWlWnWoWqWFWHWIWJWKW_W`WaWbWcWdWeWW W WWWW W!W#W'WAWBWCWDWEWFWGWHWZW[Wdarkgraytoblackphylliteandbrown-weatheringgreywackesHVVV V!VZV[VdarkgraytoblackphylliteandcalcareousphyllitewithdargV V V ViabaseAWdikes]Wdisplay]WdistributedZWdmuSWdn[WdobbWdocumentedUWdolomiticPWdWdolostoneIWJWRWTWXWaWbWcWgWdolostonemetalimestonemarbleandsubordinatequartzosemetcVdolostonesJWdominantlyGWLWdominantlygray-greenlithicwackelesserbrownquartzwackeGVdpscKWdsqKWduniteDWearlyBWGWIWeastGWeast-centralTWeasternGW`WdWelevatedUWelongateNWelsewhereSWendicottRWSWenoughKWequivalentSW[WespeciallyaWetivlukRWSWexhibitEWexpanses_WexperiencedaWexposedAWCWDWEWFWGWHWJWMWPWSWUWWWXWZW[W]W_WbWcWdWeWfWgWdpartiallyAWfWgWhWiWjWkWlWVWpartlyaWpartsBWGWNW[W]WHWIWJWKWtWuWvWwWxWyW{WWWXWYWpassKWMWPWVWWWYWZW`WcWdWgWnWpWWWWWWWW WW$W%W&W'W(W)W6W9W:WAWBW\W]WpeakedPWpebble*W+WpebblyZWDWWWWW2'APzbsBBlack metasedimentary rocksC Paleozoic ProterozoicAAmphibolite, metaquartzite, calcareous schist, metapelite, and a few small bodies of metagranite and metagabbro, exposed in the northeastern Baird Mountains quadrangle around Mt. Angayukaqsraq, in the south central Baird Mountains quadrangle near the Kobuk River, and in the northeastern Ambler River quadrangle. Light-gray to tan weathering metagranite and cream to brownish-green metagabbro occur as small bodies up to 100 m across and are volumetrically minor. This unit is part of the CentrBal belt.FQ40Ar/39Ar - 680 Ma metamorphic age, overprinting event - 40Ar/39Ar age of 120 MaGBM004H2013IBaird Mountains J MetamorphicK9300'APzbsBBlack metasedimentary rocksC Paleozoic@Brachiopods - Middle Devonian or Frasnian (early Late Devonian)GSP004H2085I Survey Pass areadWWarrigetch-igikpakPWassemblagesbWUWVWbairdaWbairdgroupaVbasalt8bearingKWLWMWNWOWPWbeltIWNWOWbWcWAWBWEWUWVWYWZW[W\W9W:W;W<W=WQWRWSWTWUWbiotitevWWbiotiteschistvVVblack`WgWlWmW W W W6WblackmetasedimentaryrocksgV Vblackphylliteandmetalimestone`V6VblackphylliteandsiliceousphyllitelV VblackquartzitemV VbluecloudqWWcalcareousOWAWBWRWYWZW[W\W?W@WQWRWSWTWUWcalcareousschistalbite-richsubunitschistbeltBVZVcalcareousschistmetachertandconglomeratesubunitschistSVTVUVcalcareousschistschistbeltOVAVYV[V\VQVRVRVRVRVorthogneiss{V|VgraniticrocksyV}VgraywackeCWHWgroupTWVW[WaWhammondoWhillsJWhunt]Whuntforkshale]VigneousrWigneousandsedimentaryrocksofthemaiyumerakmountainsrVjessekWkanuyutZW)A=Weakly metamorphosed metasandstone, meta-argillite, phyllite, conglomerate, and rare marble exposed in two belts on the Wiseman/Chandalar quadangle boundary. This subunit, the northern belt, is composed of metasandstone and argillite, and contains abundant detrital white mica. This unit is part of the Central belt.=F5Detrital white mica -Ordovician 40Ar/39Ar cooling ageGWI007H2055I Wiseman J MetamorphicK6927 darkgraytoblackphylliteandlessergray-greenphyllitew]VHVIVJVKVCVDVEVFVGVHVdarkgreenweatheringfoliatedmaficschistexposedinoneanV'Vdark-bluish-greenFWWdark-grayXWaWbWUWVWdb6Wdbl6WdebrisIWdefinedsWdeformationoW#WdeformationalwWdeformedBWtWuWvWwWxWyW{WWWXWYWdepositMWAWBWdepositsCWJWMW~W^W|W}W~W,W-W.W/W0W1W2W3W4WAWBWdeposted~W,W-W.W/W0W1W2W3W4WderivedOWoWAWBWYWZW[W\W#WQWRWSWTWUWdetailMWAWBWdetailstW7WdetectableFWWdetritaliWGWdetritusCW|W}W~WdevonianAWGWIWNWSWfWgWhWiWjWkWlWVWdgNWdhf[WdiabaseAWfWgWhWiWjWkWlWVWdifferentiatedDWWdifferstW7Wdikes]WzWHWIWJWKWdioritic{W|WLWMWNWOWdirect|W|WWelevatedUWelisWelongateNWelsewhereSWab christianP]cin0HJPhughesks}3X[mountainsBWFWHWLWSWUWVWXWZW[W\W]W^W_WaWbWcWeWfWhWjWlWrWsW|W}W~WAWBWEWFW WGWKW]WpassKWOWPWQW`WgWqW@WDWIWOWTW`WfWqWuWWWWW WWWWW$W'W-W;W?WAWEWMWSWZWriverAWIWJWMWNWTWWWYWmWnWpW{WWHWRWSWUWYWZW_WpWtWWWW WWWWW(W,W6W8W9WFWLWWW  !"#$%&'()*+,-./0167:;<=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklpqrssedimentary2345> Ã!>ÃF8Ä2Ä6A9mnoÄ7A:Äa4ÄbQfghijklÄbVpqrsÄbaÄf6 Äf7(Äfq*ÄtÄt1Ät9ÄtÄz%DÄz&Äz6HIJKÄz8?@Äz!Äq Ä67Ä _`abcdeÄq.ÄcWXÄ&Ä!>*APzpBPhylliteC Paleozoic?AKPhyllite, fine-grained schist, and phyllonite of the Central belt that underlie areas of poor exposure in the northeastern Baird Mountains quadrangle, western Ambler River quadrangle, and northwestern Chandalar quadrangle. Locally contains minor lenses of metalimestone and metaconglomerate. This unit is part of the Central belt.KGBM004H2030IBaird Mountains J MetamorphicK5560+APzjB'Metasedimentary rocks of Jesse MountainC PaleozoicAGenerally fine grained, phyllitic to schistose, gray-weathering meta-argillite, black-weathering metaquartzite, marble, and brown weathering impure marble, exposed in a single area in the eastern Wiseman quadrangle. This unit is part of the Central belt.E'Conodonts; brachiopods; coral fragmentsGWI007H2032IWiseman J MetamorphicK6850,APzbB%Black phyllite and siliceous phylliteC Paleozoic?H2032IWiseman J MetamorphicK6850,APzbB%Black phyllite and siliceous phyllites ut~AFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E5Marine mollusks of Late Early Cretaceous (Albian) ageGBT005H2091IBettles J SedimentaryK2180meta-ultramaficEWWWXWmetabasalticaWmetabasaltsAWfWgWhWiWjWkWlWVWmetabasiteEWMWcWdWEWWWXWW9W:W;W<W=WAWBWSWTWUWocksthatformanelongatebeltinthecentraNVmetachertFWIWUWpWqWrWsWmetaconglomeratejWpWWW$W%W&WmetagabbroFWHWfWoWFWpWqWrWsWWWWW W!W"W#WmetagabbrosAWFWfWgWhWiWjWkWlWpWqWrWsWmetagranitefWFWWWmetagranitic{W}WLWMWNWOW W Wmetagraniticrocksofseveralproterozoicagesexposedinso}V V VmetagraywackeBWFWpWqWrWsWtWuWvWwWxWyWzW{Wmetagraywacke-richHWWW W!W"WmetaigneousOW_WW@WAWBWRWYWZW[W\WmetalUWmetalimestoneAWFWIWJWNWTWXWYW]W^W`WaWbWcWhWjWEWHWIWJWKWPWQWUWVW^WfWgWhWiWjWkWlWpWqWrWsWWWWWWWWWWW6W9W sgray-weatheringkWWgrayish-brownqWWgraywackeCW|W}W~WgreenDWKWMWWW\WnWSWTWWW'W(W)W8WAWBW\W]Wgreenandgreenish-grayschistosetomassiveirregularly-shaKV(V)V\V]VgreenishDW8Wgreenish-grayDWKWpW$W%W&W(W)W8W\W]Wgreenish-grayyellowish-greenolivegreenorgreenishblackDV8VgreenschistZW\WSWTWWWgreenschist-faciesBWFWHW]WHWIWJWKWpWqWrWsWtWuWvWwWxWyW{WWW W!WWWXWYWZW[WgreywackeCWHW|W}W~WWW W!WZW[WgroupRWSWaWtW7Wgrybeck`WharzburgiteDW8WhasMWWWaWbWDWUWVWWWWAWBWhaveAWBWHWUW{WLWMWNWOWfWgWhWiWjWkWlWtWuWvWwWxWyW{WWW W!WVWWWXWYWZW[W[W[W[W[W[WqFwiseman/chandalariWpWGW$W%W&W*W+WwithCWDWIWMWNWUWWWXW\W]W_WbWgWsWvWwWzW|WW@WFWHWIWJWKWRWSWTWUWVW|W}W~WWWW WW*W+W8W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWSWTWUWn-koyukukBWCWtWuWvWwWxWyWzW{WzoneEWoWWWXWzonesFWacrotretidcWEWageBWCWMWhWtWtWuWvWwWxWyWzW{WagnostidcWEWalbianCWalgaesWandJWNWRWSWTWVWYWZW\W^W_W`WaWcWrWsWtWW@WDWEWPWQWRWSWTW^Ware_WW@WRWarthropodscWEWbivalvesOWAWBWYWZW[W\WbrachiopodYWbrachiopodsAWIWJWSWTWVWYWZW\W]W^W`WcWgWhWkWsWtWuWDWEWHWIWJWKWPWQWSWTW^WfWgWhWiWjWkWlWbrachiopodslatefrasniantoearlyfammenianmollusksechino]VHVIVJVKVbrachiopodsmiddledevonianorfrasnianearlylatedevoniangVbryozoanVWYWsW-APzbqBBlack quartziteC Paleozoic?A%Black weathering, fine to medium grained black metaquartzite exposed in the western Schist belt along the contact between units Dsq and DPsc. May contain small amounts of mica and show segregation of quartz and graphite in layers parallel to foliation. This unit is part of the Central belt.%GAR004H2065I Ambler River J MetamorphicK8602.APzZmB Mafic schistCProterozoic? to Paleozoic?DDark green weathering foliated mafic schist exposed in one area on the boundary between the Ambler River and Survey Pass quadrangles. This unit is part of the Central belt.GAR004H2047I Ambler RiverJ MetamorphicK8661/AKhsB%Rocks of the Hammond River shear zoneC Cretaceous? area on the boundary between the Ambler River and Survey Pass quadrangles. This unit is part of the Central belt.GAR004H2047I Ambler RiverJ MetamorphicK8661/AKhsB%Rocks of the Hammond River shear zoneC Cretaceous?04H2022I Chandalar ?parallelmW WpartAWBWCWDWEWFWGWHWIWJWKWMWNWOWQWWWZW[W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzWW@WAWBWCWEWFWGWPWQWRWUWVWWWXWYWZW[W\W]W^WfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWW W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWUWVWWWXWYWZW[W\W]WpartofheterogeneousexpansesofcalcareoussiliceousandvRV?V@VKVLVMVNVOVPVPVPVV>thoseHWWW W!WZW[WthoughtCWJWMWxW^W|W}W~WAWBWKWLWMWNWOWPWtimingwWtinyEWtoBWCWDWFWGWHWJWKWLWMWNWOWPWQWSWXW]W^W`WaWbWfWgWhWkWlWmWoWqWtWvWwWxW{W|WAWFWHWIWJWKWLWMWNWOWPWQWUWVWYW[W\W^W_W`WaWbWcWdWeWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWW W W WWWWWWWWWWWW W!W#W(W)W7W8WAWBWCWDWEWFWGWHWKWLWMWNWOWPWQWRWWWXWYWZW[W\W]WtopBWtWuWvWwWxWyW{WWWXWYWtriassicAWfWgWhWiWjWkWlWVWVWVWVWVWblackweatheringfinetomediumgrainedblackmetaquartzitemV Vblack-weatheringkWWblocksIWblockyLW_W`WaWbWcWdWeWblueFWaWFWpWqWrWsWWblueschistaWwWFWWblueschist-facieswWbodiesDWHWKWPWQW]WfWoW{WFWHWIWJWKWLWMWNWOWWWWW W!W#W(W)W8WSWTWUWZW[W\W]WborniteJW^Wboth]W{WHWIWJWKWLWMWNWOWboulders~W,W-W.W/W0W1W2W3W4WboundaryAWCWFWHWMW]WiWnWpWyWGWHWIWJWKWfWgWhWiWjWkWlWmWnWoWpWqWrWsW|W}W~WWW W!W$W%W&W'W*W+WAWBWCWDWEWFWGWHWVWZW[WboundayEWyEWyEWkWlWAWBWbroad~W,W-W.W/W0W1W2W3W4WbrokenoW#WbrosgWWWWbrownGWMWOWkWoWAWBWCWRWYWZW[W\W]WW#W?W@WAWBWbrown-weatheringHWWW W!W"W{sbrownish-gray@brownish-green@Gby@Lcalcite@chandalar@cm@]collected@composition@contain@cosmos@dalton@darkgraytoblackphylliteandlessergray-greenphyllitew@discontinuously@ dunite@encompasses@exposures@finegrainedtoconglomeraticgreywackeandfine-grainedlam@foliation@frost-rived@Rgranitequartzmonzoniteandgranodioriteofthenorthernru@ gray-weathering@heterogeneous@hunt@minclude@)interlayeredwhitetomediumgrayweatheringmetarhyoliteda@intrusive@it@kayak@least@lesserClight@(locally@mainly@Cmarbles@meta-ultramafic@metabasites@metagabbro@metalimestone:metalimestoneandlessermetasandstonemetasiltstonephyllit@}llit@}rangle@quartz-rich@ranges@fresemble@river@schist@BINTfAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGSP004H2009I Survey PassJ MetamorphicK5133/AHeterogeneous mix of finely laminated, mostly mylonitic lithologies derived in part from adjacent units exposed in the eastern Wiseman and western Chandalar quadrangles. Unit is recessive, poorly exposed, and includes large (up to 0.5 km across) bodies of black quartzite and smaller exposures of quartz-rich schist, metagabbro, dark brown marble, and relatively undeformed metasandstone and metasiltstone. In thin section, minerals are strained and broken. No age control available. The uniBqt encompasses a zone of deformation between the Schist and Central belts. This unit is part of the Central belt. _GCH004H2022I Chandalar J MetamorphicK26500APzZqsB!Quartz-rich metasedimentary rocksCPaleozoic to Proterozoic?0.5oW#W1MWAWBW10]WHWIWJWKW10'sLW_W`WaWbWcWdWeW100fWW105PW10:1BWtWuWvWwWxWyW{WWWXWYW1200GW15GW1962WWWW19786W1980`W`WW1989bSW20{WLWMWNWOW300xW5MWAWBW50GWgW W700-1850MWAWBW7250yWaBWDWHWIWLWNWSWUWVWZWfWkWoW{WFWLWMWNWOWRW_W`WaWbWcWdWeWtWuWvWwWxWyWzW{WWWWWWWWW W!W"W#W8W?W@WWWXWYWZW[WaboutxWaboveDW8WabundanceCWLW_W`WaWbWcWdWeW|W}W~WabundantFWXWaWiWGWpWqWrWsWKWLWMWNWOWPWaccompaniedpW$W%W&WacrossMWfWoW{WLWMWNWOWW#WAWBWadjacentDWNWPWQWoWvWW#W8WaffectwWaffinitiesbWUWVWaffinityEWWWXWafterFWWageBWEWGWIWaWoWvW|WWWXWtWuWvWwWxWyWzW{WW#WWWXWYWencompassesoW#WendicottRWSWtW7WenoughKW(W)W\W]Wepidote{WFWLWMWNWOWWepisodewWequigranular{WLWMWNWOWequivalentSW[WwWespeciallyaWetivlukRWSWeventwWFWWexhibitEWWWXWexpanses_WW@WRW>W?W@WIWJWKWLWMWNWOWPWexperiencedaWFWWexposedAWCWDWEWFWGWHWJWMWPWSWUWWWXWZW[W]W_WbWcWdWeWfWgWiWkWlWmWnWoWpWqWrWuWvWwWxWyWzW|W}WW@WCWGWHWIWJWKWRWUWVWWWXW]W^WfWgWhWiWjWkWlWmWnWoWpWqWrWsW|W}W~WWWWWW W W W W WWWWWWWWWWW W!W#W$W%W&W'W*W+W5W8W9W:W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWVWZW[WexposurejWWWW3AMDerBEli River sequenceCMississippian and DevonianDDolostone, limestone, argillaceous or sandy limestone, sandstone, and limestone and dolostone with chert. This unit is part of the Eli River sequence defined by Karl and others, 1989). EStromatoporoids, brachiopods; pelmatozoan, bryozoan, and coral fragments, foraminifers, and algae (possibly mid-Famennian); spiculitic limestone; conodontsGBM004H2070IBaird Mountains J SedimentaryK69824ATrCsBSedimentary rocksCTriassic to Carboniferousd by Karl and others, 1989). EStromatoporoids, brachiopods; pelmatozoan, bryozoan, and coral fragments, foraminifers, and algae (possibly mid-Famennian); spiculitic limestone; conodontsGBM004H2070IBaird Mountains J SedimentaryK69824ATrCsBSedimentary rocksCTriassic to Carboniferousforaminifers; crinoidal packstone; burrows and trace fossils; brachiopods Wolfcampian ageGCH004H2026I Chandalar K5004kayakRW[WtW7WkekiktukWWtWWW7Wkilometer{WLWMWNWOWkilometer-scaleFWpWqWrWsWkivivikSWkmoW#Wkms{WLWMWNWOWknotsFWWknownvWWkobukEWfWWWXWWksDW8WkyaniteWWWWlackWWWWlaminatedCWaWoW|W}W~W#WSWTWUWlargeKWoWyW#W(W)W\W]WlargerVWWlateBWGWIWtWuWvWwWxWyW{WWWXWYWlaurentianbWUWVWlayersAWGWJWMWWWXW]WgWmWpWHWIWJWKW^WfWgWhWiWjWkWlWWW W W$W%W&WAWBWCWDWEWFWGWHWSWTWUWVWVWWVWW\W_W`WaWbWcWdWeW>W?W@WlensesHWKWLWMWXWjWqW_W`WaWbWcWdWeWWWWWW W!W"W(W)WAWBWlessLWSWhW{WLWMWNWOW_W`WaWbWcWdWeWWWWWWWlesserGW]W^W_WbWW@WCWHWIWJWKWPWQWRWUWVW]W>W?W@WW4EdConodonts; foraminifers; crinoidal packstone; burrows and trace fossils; brachiopods Wolfcampian ageGCH004H2026I Chandalar J SedimentaryK50045ASCvsBVolcanic and sedimentary rocksCSilurian to CambrianA=Volcanic rocks, volcaniclastic rocks, and clastic sedimentary rocks exposed in the core of the Doonerak antiform, northeast Wiseman quadrangle. The unit can be divided into at least two lithologic sequences, one dominated by volcanic rocks, the other by sedimentary rocks. This unit is part of the Doonerak antiform.=E=Microfossils, brachiopods, trilobites, graptolites, conodontsF2K-Ar and Ar-Ar ages of dikes 373-388 Ma and 478 MaGWI007H2057IWiseman J SedimentaryK67206APzZbsBBiotite schistCPaleozoic to Proterozoic?DQuartz-albite-oligoclase-biotite schist with staurolite and andalusite exposed in the southeastern Chandalar quadrangle, adjacent to rocks of the Schist belt. Age of metamorphism not known. This unit is part of the Ruby terrane.GCH004H20344AQuartzite, phyllite, siltstone, conglomerate, shale, sandstone, limestone, argillaceous limestone, dolomitic limestone, and cherty dolostone. Occurs in the Mount Doonerak area in northeastern Wiseman and northwestern Chandalar quadrangles, where it is interpreted to unconformably overlie lower Paleozoic rocks (map unit SCvs). Consists of Kekiktuk Conglomerate and Kayak Shale of the Endicott Group , Lisburne Group, Echooka Formation of Sadlerochit Group, and Shublik Formation and Karen CreBek Sandstone. Succession is similar to that of map unit JCs but differs in some details. This unit is part of the Doonerak antiform.rpelecypodYWWWpelecypods\WSWTWpelmatozoanhWsWWWWWWWplantBWTWZW\WDWSWTWtWuWvWwWxWyW{WWWWWWXWYWpossibleYWhWWWWWWWWWpossiblysWprotoconodontscWEW9W:W;W<W=WradiolarianSWradiolariansAWFWOWRW`WAWBWYWZW[W\WfWgWhWiWjWkWlWpWqWrWsW6WQWRWSWTWUWVWVWVpVqVrVsVradiolariansconodontsmegafossilsforaminifersbryozoansbrAVfVgVhViVjVkVlVrugoseJW^WscleritescWEW9W:W;W<W=WsilicifiedhWWWWWWWsolitary^WPWQWsome\WSWTWsparseBWtWuWvWwWxWyWzW{WsparseplantfossilsofearlytolatecretaceousageearlycBVtVuVvVwVxVyVzV{VspiculesOWRWVWAWBWYWZW[W\WWQWRWSWTWspiculiticsWspinesNWspongeOWRWVWAWBWYWZW[W\WWQWRWSWTWP#BUUX  $,.YesNo/,  , : AM PMO, : AM PMOOoliveDW8Wolive-coloredFWWolivinexWonEWFWSWbWiWnW~WGWUWVWpWqWrWsW'W*W+W,W-W.W/W0W1W2W3W4WlyNWEWFWWopcEWorDWGWHWJWLWSWVWWW]WsW{WHWIWJWKWLWMWNWOW^W_W`WaWbWcWdWeWWWWWW W!W"WorangePWbWdWUWVWWorange-weatheringOWaWgWAWBWRWYWZW[W\W WorderSWordovicianbWEWUWVWoriginJW^Woriginal\WSWTWoriginallyFWWorthogneissEWPWQW{W|WLWMWNWOWWWXWotherNWQWUWuWothersJWSWWWbWsWUWVW^WWWotukRWoutIWoutcropsLWFW_W`WaWbWcWdWeWWouterCW|W}W~Wover{WLWMWNWOWoverlietWoverliesRWoverprintAWFWfWgWhWiWjWkWlWWoverprintedFWWoxides{WLWMWNWOWpackageAWfWgWhWiWjWkWlWpaleMW|Wpalegray-greenmassivetogneissicgranitictodioriticort|VpaleozoicIWtW'9AKgBGranitic rocks C Cretaceousary?DFlat-lying, vesicular olivine basalt flows exposed in the southeast part of the Chandalar quadrangle. Thought to be about 300 meters thick. GCH004H2069I Chandalar JIgneousK350N35009AKgBGranitic rocks C Cretaceousevent to affect the schists was blueschist-facies. The blueschist episode was similar in grade, deformational style, and timing to the blueschist-facies event recorded in the Schist belt. This unit is part of the Ruby terrane.GCH004H2035I Chandalar J MetamorphicK86018AQTbBBasaltCQuaternary? or Tertiary?DFlat-lying, vesicular olivine basalt flows exposed in the southeast part of the Chandalar quadrangle. Thought to be about 300 meters thick. GCH004H2069I Chandalar JIgneousK350N35009AKgBGranitic rocks C Cretaceous09AKgBGranitic rocks C Cretaceoussouth of map area are 96-112 MaGWI006H2037IWisemanK2530:AKmB MigmatiteC CretaceousA^Intercalated granitic rocks, biotite schist, and hornblende hornfels; pyroxene hornfels and granitic dikes, associated with Cretaceous granitic rocks. All exposed in the northern Ruby terrane, along the southern margin of the Chandalar quadrangle. Includes one polygon southeast of Caro mapped by Brosge and Reiser as part of their map unit MzPzg.^GCH004H2036I ChandalarJ MetamorphicK2610;ADgBGranitic orthogneissCDevonian the Chandalar quadrangle. Includes one polygon southeast of Caro mapped by Brosge and Reiser as part of their map unit MzPzg.^GCH004H2036I ChandalarJ MetamorphicK2610;ADgBGranitic orthogneissCDevonianRgranitequartzmonzoniteandgranodioriteofthenorthernruyVmVnVoVgraniticCWzW{W|WLWMWNWOW|W}W~WgranodioriteyWmWnWoWgranodioritic{WLWMWNWOWgraphitemW WgraphiticJWLW`WdW^W_W`WaWbWcWdWeWW6Wgravel~W,W-W.W/W0W1W2W3W4WgrayHWJWLWMWNWOWPWWW\W]WbWgWhWlWqW{WAWBWHWIWJWKWLWMWNWOWRWSWTWUWVWYWZW[W\W^W_W`WaWbWcWdWeWWW W WWWWWWWWWW W!W?W@WAWBWCWDWEWFWGWHWQWRWSWTWUWZW[Wgraydarkgrayorbrownish-grayweatheringdominantlypelitiLV_V`VaVbVcVdVeVgraymarbleorangedolomiticmarblemagnetite-bearingchloriPVgraytodarkgraycarbonaceousphyllitelocallysilicarichlV Vgray-greenGW]W|WCWHWIWJWKW]WCWDWEWFWGWHWHW >AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GBM004H2040IBaird MountainsJ SedimentaryK100N1000sraq - 750 +/- 6 MaGBM004H2011IBaird Mountains J MetamorphicK9045>AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GBM004H2040IBaird MountainsJ SedimentaryK100N1000ountains J MetamorphicK9045>AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GBM004H2040IBaird MountainsJ SedimentaryK100N1000gravel, and boulders; fluvial gravel and sand; terrace deposits.GBM004H2040IBaird MountainsJ SedimentaryK100N1000 Y=ApCgBGranitic orthogneissC PaleozoicDuMetagranitic rocks of several Proterozoic ages exposed in southern Baird Mountains and western Wiseman quadrangles. F{U-Pb zircon ages: southern Baird Mtns quad - 705+/-35 Ma; Ernie Lake pluton - 971+/-5 Ma; Mt. Angayukaqsraq - 750 +/- 6 MaGBM004H2011IBaird Mountains J MetamorphicK9060exposed in southern Baird Mountains and western Wiseman quadrangles. F{U-Pb zircon ages: southern Baird Mtns quad - 705+/-35 Ma; Ernie Lake pluton - 971+/-5 Ma; Mt. Angayukaqsraq - 750 +/- 6 MaGBM004H2011IBaird Mountains J MetamorphicK9060 discontinuouslyhWWWWWWWdisplay]WHWIWJWKWdistributedZWWWdivideduW5WdmuSWdn[WdobbWUWVWdocumentedUWwWdolomiticPWdWtWW7WdolostoneIWJWRWTWXWaWbWcWgWhWsWtWEWFWUWVW^WW WWWWWWW7W9W:W;W<W=WdolostonelimestoneargillaceousorsandylimestonesandstonsVdolostonemetalimestonemarbleandsubordinatequartzosemetcVEV9V:V;V<V=VdolostonesJW^WdominantlyGWLW_W`WaWbWcWdWeWdominantlygray-greenlithicwackelesserbrownquartzwackeGVdominatedpWuW$W%W&W5WSWTWUWdooneraktWuW5W7WdpscKWmW W(W)W\W]WdsqKWmW W(W)W\W]W8WearliestwWearlyBWGWIWtWuWvWwWxWyWzW{WWWXWYWeastGWeast-centralTWeasternGW`WdWkWoWCW]WWW#W6WechookatW7WelevatedUWelisWelongateNWelsewhereSWtectonicFWpWqWrWsWtectonicassemblageofmetertokilometer-scalefaultsliverFVpVqVrVsVtectoniteDW8WtensOWAWYW[W\WQWRWterrace~W,W-W.W/W0W1W2W3W4WWlWmWnWoWWtexturesAWMWQWZW\WSWTWfWgWhWiWjWkWlWWWthanCW{WLWMWNWOW|W}W~WthatBWGWIWLWNWOWaWjWtWAWBWEWYWZW[W\W_W`WaWbWcWdWeWtWuWvWwWxWyWzW{WWWtheAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|WW@WAWBWCWEWFWGWHWIWJWKWLWMWNWOWPWQWRWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWW W W WWWWWWWWWWWXterraneAWEWWWXWfWgWhWiWjWkWlWVWtheAWNWSWbWcWdWoWrWEWUWVWfWgWhWiWjWkWlWW#W9W:W;W<W=WVWthermalPWthrustbWUWVWundividedPWYW[WeW~WWWWWWW,W-W.W/W0W1W2W3W4WvolcanicuW5WvolcanicandsedimentaryrocksuV5Vvolcanic-clastCW|W}W~Wvolcanic-clastgraywackeandmudstoneCV|V}V~Vvolcanic-rockKWLWMWNWOWPWwackeGWCW]WwackeandlesseramountsofshaleGVwackeandlesseramountsofshaleschistoseCV]VyoungerbWUWVWyoungercarbonaterocksofthenanielikantiformcentralbelbVUVVVzoneoW#W#W#W#W#WriverAWDWFWIWMWNWTWWWYWZW`WeWfWjWlWnWsWfWgWhWiWjWkWlWpWqWrWsWWWWWWWW WWWWWWW'W6W8WAWBWVWBWEWNWWWXWtWuWvWwWxWyWzW{WSWTWUWrocksBWCWDWEWIWKWNWQWSWWW_WaWcWeWtWuWvWzW}WW@WBWEWFWRWWWXWZWtWuWvWwWxWyWzW{W|W}W~WWWW W WWWWWW(W)W5W7W8W9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWrubble~W,W-W.W/W0W1W2W3W4WrubyJWvWwWyWzW^WmWnWoWWsadlerochittW7Wsand~W,W-W.W/W0W1W2W3W4WsandstoneHWRWSWVW[WsWtWDWWWWW W!W"W*W+W7WsandstoneshaleargillaceouslimestonelimestonedolostonemRVsandysWscaleKWSW(W)WSWTWUWscalesLWOWAWYW[W\W_W`WaWbWcWdWeWQWRWW ?ADmuB,Metasedimentary and lesser metaigneous rocksCMiddle and Late DevonianA#Heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. Includes significant expanses of rocks mapped as Beaucoup Formation by some workers. This unit is part of the Central belt.#EW?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWZW[WalsoHWSW{WLWMWNWOWWW W!WZW[WamblerAWBWDWIWMWNWTWWWYWZW`WeWfWjWlWnWfWgWhWiWjWkWlWtWuWvWwWxWyW{WWWWWWWW WWWWWWW'W6W8WAWBWVWWWXWYWamountsCWmW|W}W~W W W W WWyWzW{W}W~WW@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~W'shaleandsandstoneexposedinthenorthwestbairdmountains[VshardMWAWBWshearFWWshowKWMWmW W(W)WAWBW\W]WshowingSWshownSWshubliktW7WshungnakBWDWtWuWvWwWxWyW{W8WWWXWYWsiberianbWUWVWsignificant_WW@W>WIWJWsiksikpukRWsilicalW WsiliceousUW]W_W`WeWW@WHWIWJWKWRWWWWW6W>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWsilicifiedXWsills]WHWIWJWKWKWsshaleandsandstoneexposedinthenorthwestbairdmountains@siltsone@similar@southeast@vstretching@tectonic@terrane@thethem@lthin-bedded@>those@tuff@types@unit7units@varieties@Avolumetrically@where@wiseman/chandalar@within@qbivalves@brachiopodslatefrasniantoearlyfammenianmollusksechino@bryozoan@bryozoans@conodontsandmegafossils@;corals@devonian-mississippi@endothyrid@fine@gastropods@"marinemollusksoflateearlycretaceousalbianage@gmollusks@pelecypod@radiolariansconodonts@steinkerns@7cs004@8Ä1S@ amblerriver@achristian@selawik@b sedimentary@ @VFApCam_572B7Metamorphic rocks of Mt. Angayukaqsraq, remetamorphosedC Proterozoicate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite. Only exposures that contain the Ordovician part of unit OPc are included in this unit.EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGBM004H2042IBaird Mountains J MetamorphicFApCam_572B7Metamorphic rocks of Mt. Angayukaqsraq, remetamorphosedC Proterozoic40Ar/39Ar - 680 Ma metamorphic age, overprinting event - 40Ar/39Ar age of 120 MaGBM004H2068IBaird Mountains +HADhfBHunt Fork ShaleC Late DevonianA=Weakly metamorphosed metasandstone, meta-argillite, phyllite, conglomerate, and rare marble exposed in two belts on the Wiseman/Chandalar quadangle boundary. This subunit, the northern belt, is composed of metasandstone and argillite, and contains abundant detrital white mica. This unit is part of the Central belt.=F5Detrital white mica -Ordovician 40Ar/39Ar cooling ageGCH004H2055I Chandalar J MetamorphicK-HADhfBHunt Fork ShaleC Late Devonianl white mica -Ordovician 40Ar/39Ar cooling ageGCH004H2055I Chandalar J MetamorphicK-HADhfBHunt Fork ShaleC Late DevonianEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GAR004H2018I Ambler RiverK6925 Ã!>,-./01234ÃF8Ä*tuvwxy{WXYÄ2|}~Ä59mnoÄ7!:Ä7a/#ÄE8ÄZb2ÄaÄaÄa47ÄbDfghijklVÄbVpqrsÄf6 Äfq*Äfv !Z[Äf ÄsÄtÄtÄt1Ät9ÄtB' ÄtqÄtvÄw 6Äx155Äya+ÄzSTÄz%DÄz&Äz6HIJKÄz8)?@G^*+>IJÄzbPQÄzR?@ÄzKLMNOPÄz!"UVÄz3Äz(Ä ()\]ÄC]Ä&Ä6CDEFGHÄF, Äa;LMNOÄq ABÄqÄrÄQ#9:ÄRE;<=Ä6Ä -_`abcde Ä0$%&Ä1ÄAY[\QRÄBZÄSTUÄ"$Äf%Är.'ÄcWXÄV<Äq= Ä&FÄ67Ä!>,-./01234ÄF8888 JHEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GAR004H2018I Ambler RiverJ MetamorphicK6925IADhfBHunt Fork ShaleC Late DevonianADark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. Locally massive mafic sills and dikes up to 10 m thick are common. Mafic bodies in the unit (both strongly or weakly foliated parts) display lower greenschist-facies minerals.EjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GSP004H2018I Survey PassJ MetamorphicK6925JADhfBHunt Fork ShaleC Late DevonianEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GWI006H2018IWisemanK6925HADark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. Locally massive mafic sills and dikes up to 10 m thick are common. Mafic bodies in the unit (both strongly or weakly foliated parts) display lower greenschist-facies minerals. JJEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GWI007H2018IWisemanJ MetamorphicK6925KADhfBHunt Fork ShaleC Late DevonianADark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. Locally massive mafic sills and dikes up to 10 m thick are common. Mafic bodies in the unit (both strongly or weakly foliated parts) display lower greenschist-facies minerals.EjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GCH004H2018I ChandalarJ MetamorphicK6925LADgBGranitic orthogneissCDevonianzircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GSH005H2003IShungnakJADark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. Locally massive mafic sills and dikes up to 10 m thick are common. Mafic bodies in the unit (both strongly or weakly foliated parts) display lower greenschist-facies minerals.oandalusitevWWangayuchamAWDWfWgWhWiWjWkWlW8WVWangayukaqsraqfWWantiformXWbWtWuWBWUWVWZW5W7WanyWWWWaphaniticMWAWBWapparentlyPWappearQWapproximatelyPWarcticMWAWBWareBWCWGWHWIWJWLWMWNWOWPWQWWW\W]WaWbWfWoW{WAWBWEWFWHWIWJWKWLWMWNWOWSWTWUWVWYWZW[W\W^W_W`WaWbWcWdWeWtWuWvWwWxWyW{W|W}W~WWWWWWW W!W#W;W<W=WAWBWCWDWEWFWGWHWQWRWSWTWUWWWXWYWZW[W[W[WjWkWlWpWqWrWsWWWWWWWWWWW'W7WareasEWMWZWjWFWWWXWWWWWWAWBWargillaceousRWaWsWtW7WargilliteiWGW*W+WaroundfWWarrigetchPWarrigetch-igikpakPWQWasJWLWMWSW_WbWfWW@WUWVW^W_W`WaWbWcWdWeWW>WAWBWascendingSWggastropodsJWVWYW\W`WSWTW^WWWW6WghostsOWSWAWBWYWZW[W\WQWRWSWTWUWghostsofradiolariansspongespiculesbivalvesfinegraphitOVAVBVYVZV[V\VQVRVSVTVUVgraphiteOWAWBWYWZW[W\WQWRWSWTWUWgraptolites`WcWuWEW5W6W9W:W;W<W=WgrazingRWhyolithidscWEW9W:W;W<W=WlaminaeOWAWBWYWZW[W\WQWRWSWTWUWlateBWCW\W]W^W_WgWhWW@WHWIWJWKWPWQWRWSWTWtWuWvWwWxWyW{W|W}W~W WWWWWWW>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWWWXWYWlatedevoniansomefamennianconodontsbrachiopodsechinoder\VSVTVlatemiddletoearlylatedevonianconodontsandmegafossils^VPVQVlatestXWlimestonesWlithostrotionidXWmarineBWCWtWuWvWwWxWyW{W|W}W~WWWXWYWYWYWlluscanYW$MATan to gray weathering, equigranular to porphyroblastic, fine to coarse grained metagranitic bodies ranging in size from less than a kilometer to over 20 kms across, found in both the Schist and Central belts. Generally granitic in composition and made up of quartz, K-feldspar, albite, muscovite, and biotite. In the Chandalar quadrangle, the Horace Mountain pluton is dioritic to granodioritic in composition, and contains hornblende. Chlorite, sericite, Fe-Ti oxides, epidote minerals, andB calcite are also present in many of the plutons. Remnants of intrusive contact relations are locally preserved. Exposures of skarn have been mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). FXU-Pb zircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GCH004H2003I ChandalarJ MetamorphicK7250NADgBGranitic orthogneissCDevonian#*MADgBGranitic orthogneissCDevonianular to porphyroblastic, fine to coarse grained metagranitic bodies ranging in size from less than a kilometer to over 20 kms across, found in both the Schist and Central belts. Generally granitic in composition and made up of quartz, K-feldspar, albite, muscovite, and biotite. In the Chandalar quadrangle, the Horace Mountain pluton is dioritic to granodioritic in composition, and contains hornblende. Chlorite, sericite, Fe-Ti oxides, epidote minerals, andB calcite are also present in many of the plutons. Remnants of intrusive contact relations are locally preserved. Exposures of skarn have been mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). FXU-Pb zircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GSH005H2003IShungnakJ MetamorphicK6523MADgBGranitic orthogneissCDevonian&=OADgBGranitic orthogneissCDevonianATan to gray weathering, equigranular to porphyroblastic, fine to coarse grained metagranitic bodies ranging in size from less than a kilometer to over 20 kms across, found in both the Schist and Central belts. Generally granitic in composition and made up of quartz, K-feldspar, albite, muscovite, and biotite. In the Chandalar quadrangle, the Horace Mountain pluton is dioritic to granodioritic in composition, and contains hornblende. Chlorite, sericite, Fe-Ti oxides, epidote minerals, andB calcite are also present in many of the plutons. Remnants of intrusive contact relations are locally preserved. Exposures of skarn have been mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). %OFYU-Pb zircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GSP004H2003I Survey PassJ MetamorphicK7250PADlB MetalimestoneCDevonianDMetalimestone and lesser metasandstone, metasiltstone, phyllite, and minor conglomerate. Assigned in part to Beaucoup Formation by some workers. This unit is part of the Central belt.Elate Middle to early Late Devonian conodonts and megafossils (solitary and colonial corals, stromatoporoids, brachiopods, and mollusks)GCS004H2019I Christian J MetamorphicK6951QADlB MetalimestoneCDevonianDMetalimestone and lesser metasandstone, metasiltstone, phyllite, and minor conglomerate. Assigned in part to Beaucoup Formation by some workers. This unit is part of the Central belt.Elate Middle to early Late Devonian conodonts and megafossils (solitary and colonial corals, stromatoporoids, brachiopods, and mollusks)GCH004H2019I ChandalarJ MetamorphicK6951RADmu_5421%IBaird MountainsJ MetamorphicK8655SlightOWXWaWbWpWqWAWBWRWUWVWYWZW[W\WW$W%W&W?W@WQWRWSWTWUWlightgraybrownandlocallyorange-weatheringlithologicallOVAVBVYVZV[V\VQVRVSVTVUVlightmediumanddarkgrayphyllitedarkgraytoblackmetaqqVVlighttomedium-grayweatheringdark-graymetalimestoneandXVlight-grayfWWlimestoneRWSWVWrWsWtWW7WlimitedSWlineatedAWfWgWhWiWjWkWlWVWlineationsEWWWXWlisburneRWtW7WlithicGW]WCWHWIWJWKW]WCWDWEWFWGWHWlithofaciesbWUWVWlithologicuW5WlithologicallyHWOWAWBWYWZW[W\WWW W!WQWRWSWTWUWZW[WlithologiesNWOWQWoWAWYW[W\W#WQWRWlocalNW\WSWTWlocalitiesGWaWlocalityXWyXWmincludeXWbWUWVWincludedWWEWWW;W<W=WincludesNWSW_WoWyWzWW@WDWW#W>WIWJWincludingMWNWAWBWincreasesCW|W}W~WindicateIWindicatesNWindicatingaWindicative\WSWTWintercalatedIWzWintercalatedgraniticrocksbiotiteschistandhornblendehozVinterlayeredMWOWeWAWYW[W\WWWWWAWBWQWRW.&SADnBNoatak SandstoneCDevoniangneous rocks, calcareous, iron-rich componentsCMiddle and Late DevonianAhPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. This part of the unit contains a light brown, gray, and orange-weathering ferruginous and calcareous mica schist, phyllite, and metasiltstone. This unit is part of the Central belt.hE=Megafossils and conodonts are Middle and early Late Devonian FnU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocksGAR004H2052I Ambler RiverJ MetamorphicSADnBNoatak SandstoneCDevonianzLate Devonian (some Famennian)conodonts, brachiopods, echinoderms, gastropods, pelecypods, plant debris, and trace fossilsGAR004H2056I Ambler RivermetasedimentaryandmetavolcanicrocksundividedeVVVVVmetasedimentaryrocksiVGV*V+VmetasedimentaryrocksofbluecloudmountainqVVmetasedimentaryrocksofjessemountainkVVmetasedimentaryrocksundividedYVVVmetavolcanicAWeWfWgWhWiWjWkWlWWWWWVWmigmatite:mosquitoEWWWXWmountainkWqWWWmountainsrWmtfWFWWWmudstoneCW|W}W~WnanielikbWUWVWnoatak\WDWSWTWWnoataksandstone\VSVTVnorthernbWUWVWofAWGWIWJWNWSWTWVWbWcWdWfWkWoWqWrWCWEWFWUWVW]W^WfWgWhWiWjWkWlWWWWWWW#W9W:W;W<W=WVWoldercWEW9W:W;W<W=WoldercarbonaterocksofthecentralbeltcV9V:VoldercarbonaterocksofthecentralbeltrestrictedEV;V<V=Vorthogneiss{W}WLWMWNWOW W WAmiddleandlatedevonian_VV@VRV>V?V@VIVJVKVLVMVNVOVPVmiddledevoniantoordovicianbVUVVVmiddleordoviciantoproterozoiccVEV9V:V;V<V=VmississippianZW[WsWDWWWWmississippiananddevonian[VsVorxWordovicianaWbWcWEWUWVW9W:W;W<W=WpaleozoicDW dWeW'()*+,-nWpWqWvWwW|W=G WWWWWWW !$W%W&W'W()*+8WZ[\]]\]\]]]WZW[W\WWWWproterozoictopaleozoicnVquaternaryxW>quaternaryortertiaryxVsilurianJW uW^WsiluriantocambrianuVtertiaryxWtoAWDWEWFWOWPWQWRWSWaWbWcWdWnWpWqWrWtWuWvWwW|WAWBWEWUWVWWWXWYWZW[W\WfWgWhWiWjWkWlWpWqWrWsWWWtriassictWtriassictocarboniferoustVupperZWDWWWW/VBfYounger carbonate rocks of the Nanielik Antiform, Central belt and part of Northern Thrust AssemblagesCMiddle Devonian to OrdovicianAVery light- to dark-gray- (locally orange-) weathering, gray to black, commonly massive dolostone and lesser metalimestone and marble exposed in the northeastern Baird Mountains quadrangle in the Nanielik antiform and in the northwestern Chandalar quadrangle. Unit has similarities in lithofacies and biofacies to younger part of DOb, as well as coeval strata of the York Mountains on Seward Peninsula. Ordovician biotas include some megafossils and microfossils with Siberian affinities and oBthers with Laurentian affinities; Silurian and younger fossil assemblages are chiefly cosmopolitan. This unit is part of the Central belt.xE"Conodonts, corals, stromatoporoidsGCH004H2016I Chandalar J MetamorphicK6980WADpCmB#Metamorphic rocks, Mosquito terraneCDevonian to Proterozoic?*SA1Consists of metasandstone and metasiltstone with subordinate interlayers of green, gray, and maroon phyllite and local ironstone concretions. Semischistose textures and minerals indicative of lower greenschist facies metamorphism occur locally, but original sedimentary structures are commonly preserved. 1EzLate Devonian (some Famennian)conodonts, brachiopods, echinoderms, gastropods, pelecypods, plant debris, and trace fossilsGAR004H2056I Ambler RiverJ MetamorphicK6900TADnBNoatak SandstoneCDevonianA1Consists of metasandstone and metasiltstone with subordinate interlayers of green, gray, and maroon phyllite and local ironstone concretions. Semischistose textures and minerals indicative of lower greenschist facies metamorphism occur locally, but original sedimentary structures are commonly preserved. 1E{Late Devonian (some Famennian)conodonts, brachiopods, echinoderms, gastropods, pelecypods, plant debris, and trace fossils GSP004H2056I Survey Pass-WAPelitic schist, metabasite, minor felsic orthogneiss and meta-ultramafic rock exposed in two small areas along the Kobuk fault zone in the northeast Bettles and southwest Chandalar quadrangles. The rocks exhibit amphibolite-facies metamorphic assemblages, mylonitic foliations and well-developed stretching lineations. Age and affinity of the protolith rocks is unknown. This unit is part of the Mosquito terrane.F&54.8 +/- 1.3 Ma white mica cooling ageGCH004H2008I Chandalar J MetamorphicK8852 9\ALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. Within the unit, lithologies are interlayered at scales varying from millimeters to tens of meters. Part of the Schist belt.EbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGCH004H2001I Chandalar J MetamorphicK8605]ADps_101B-Wacke and lesser amounts of shale - schistoseCDevonianDSchistose varieties of gray-green lithic wacke, lesser brown quartz wacke, and black shale and silty shale exposed in the eastern map area. This unit is part of the Phyllite belt.GCS004H2083I Christian J MetamorphicK7200^ADScBCarbonate rocks of Cosmos HillsCDevonian and Silurian3XAPelitic schist, metabasite, minor felsic orthogneiss and meta-ultramafic rock exposed in two small areas along the Kobuk fault zone in the northeast Bettles and southwest Chandalar quadrangles. The rocks exhibit amphibolite-facies metamorphic assemblages, mylonitic foliations and well-developed stretching lineations. Age and affinity of the protolith rocks is unknown. This unit is part of the Mosquito terrane.F&54.8 +/- 1.3 Ma white mica cooling ageGBT005H2008IBettles J MetamorphicK8852YADpCscBCalcareous schist, Schist beltCDevonian to ProterozoicALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. Within the unit, lithologies are interlayered at scales varying from millimeters to tens of meters. Part of the Schist belt.dshungnak$Är@&Äz@'Ä5@% @P RPTHA A!{wiseman metamorphic€ bairdmountains €dhf@ €& €; metamorphic€Zjdab@€n metamorphic€{€pzm@€#€  @P RPTHA A!@ RPTHA A!!143YEbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGAR004H2001I Ambler River J MetamorphicK8605ZA DpCsc_541B4Calcareous schist - albite-rich subunit, Schist beltCDevonian to ProterozoicALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. These exposures in the western part of the schist belt, in the Akiak antiform, are rich in carbonate-and albite-rich rocksEbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGAR004H2063I Ambler River J MetamorphicK860736F[ADpCscBCalcareous schist, Schist beltCDevonian to ProterozoicDevonian to ProterozoicALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. These exposures in the western part of the schist belt, in the Akiak antiform, are rich in carbonate-and albite-rich rocks. Part of the Schist belt.EbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGAR004H2063I Ambler River J Metamorphic[ADpCscBCalcareous schist, Schist beltCDevonian to Proterozoicaminae, stromatolites, conodontsGAR004H2063I Ambler River J Metamorphic~€QALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. Within the unit, lithologies are interlayered at scales varying from millimeters to tens of meters. Part of the Schist belt. EbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGSE005H2001ISelawik J MetamorphicK8605€RADpCscBCalcareous schist, Schist beltCDevonian to Proterozoic4 7[ALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. Within the unit, lithologies are interlayered at scales varying from millimeters to tens of meters. Part of the Schist belt.EbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGWI007H2001IWiseman J MetamorphicK8605nsteinkernscWEW9W:W;W<W=WstromatolitesOWXWcWAWBWEWYWZW[W\W9W:W;W<W=WQWRWSWTWUWstromatoporoidsJWNW^WaWbWhWsWPWQWUWVW^WWWWWWWstromatoporoidsbrachiopodspelmatozoanbryozoanandcoralfsVtabulateJW^WtoBWXW]W^WHWIWJWKWPWQWtWuWvWwWxWyW{WCWDWEWFWGWHWWWXWYWtrace\WtWSWTW7WtracesRWtrilobiteshWuWWWWWWW5Wtwo-holehWWWWWWWwolfcampiantW7War004 -.0;?HRSUYZ_pt (,689FLbm004 !"#%&(*,23<=>ABEF GK]bt005Xlo{~4Ych004/4678:CGKMQVW\bhmw!&)+/5:=CIOUUOUUOUUOUUÄ1 _`abcdeÄ1AY[\QRÄ11Ä1;LMNOÄ1 ABÄ1 ()\]Ä1 !Z[Ä1WXÄ1fghijklVÄ1"= Ä1#$Ä1$&Ä1 :Ä1'"UVÄ1(?@>IJÄ1)HIJKÄ1*PQÄ120$%&Ä13/#Ä14(Ä1747Ä18Ä19Ä1A*Ä1C+Ä1E6Ä1F7Ä1G:Ä1H9mnoÄ1Ituvwxy{WXYÄ1J8Ä1Q>,-./01234Ä1RSTU1UCDEFGHÄ1VÄ1W%Ä1X.'Ä1YÄ1Z 6Ä1cR?@Ä1f)G*+Ä1gSTÄ1h55Ä1rÄ1sÄ1tBZÄ1v- Ä1w, Ä1x<Ä1yFÄ1z!8Ä13Ä1Ä18Ä1Ä1Ä12Ä1Ä1C]Ä1 ^Ä1' Ä1 Ä1Ä1DÄ1Ä1|}~Ä1pqrs amblerAWIWJWMWNWTWWWYWmWnWpW{WWHWRWSWUWYWZW_WpWtWWWW WWWWW(W,W6W8W9WFWLWm0<^AThin-bedded to massive dolostone, metalimestone, and marble, locally graphitic or phyllitic exposed in fault slices in the Cosmos Hills. Minor thin, micaceous layers interpreted as airfall tuffs, and some buff to reddish gray dolostones thought to be of hydrothermal origin (Hitzman and others, 1982). Some intervals are fossiliferous and may represent biohermal build-ups. Hosts the copper-rich Ruby Creek (or "Bornite") and associated stratabound sulfide deposits. This unit is part of the CoBsmos Hills sequence.EYConodonts, brachiopods, gastropods, crinoids, tabulate and rugose corals, stromatoporoidsGSH005H2084I Shungnak J MetamorphicK6927QiEJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGCS004H2009I Christian J MetamorphicK51339conodontsandmegafossilsrVconodontsbrachiopodsandmollusksforaminifersradiolarianSVconodontsbrachiopodscoralfragmentskVVconodontsbrachiopodsgastropodscrinoidstabulateandrugosJV^Vconodontsbryozoanscorals*V+VconodontscoralsandstromatoporoidsaVconodontscoralsstromatoporoidsbVUVVVconodontscoralsstromatoporoidsspinesandechinodermdebriNVconodontsdevonian-mississippiUVconodontsforaminiferscrinoidalpackstoneburrowsandtracetV7Vconodontsgraptolitesradiolarianscoralsgastropodsbryozoa`V6Vconodontssilicifiedtwo-holecrinoidcolumnalsoflateearlhVVVVVVVconodontsstromatolitesprotoconodontschancelloridscleritecVEV9V:V;V<V=Vconularids`W6WcoralkWsWWcorallineVWW9@_ADsqBQuartz-mica schistCDevonianAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  F>Youngest detrital zircon population at one locality 370-360 MaGAR004H2000I Ambler RiverJ MetamorphicK8602`ADsqBQuartz-mica schistCDevonian zircon population at one locality 370-360 MaGAR004H2000I Ambler RiverJ MetamorphicK8602`ADsqBQuartz-mica schistCDevonianF>Youngest detrital zircon population at one locality 370-360 MaGSP004H2000I Survey PassK8602AJDkB#Rocks of the Kivivik Creek sequenceCJurassic to DevonianAConsists, in ascending order, of Devonian marine sedimentary rocks equivalent to unit Dmu, sandstone, conglomerate, and shale of the Endicott Group (Devonian and Mississippian), limestone and tuff (Mississippian), chert and phyllite (Carboniferous), and Etivluk Group (Carboniferous to Jurassic), exposed in the northwestern Baird Mountains quadrangle. The sequence also includes limited exposures of less stratigraphically well-defined shale (Devonian) and limestone (Devonian and (or) MissisBQsippian). The sequence contains several units shown separately on this map elsewhere in the west-central Baird Mountains quadrangle; structural complexity and small scale of exposures precludes showing them separately on this section of the map. As a group, the units were combined into the Kivivik sequence by Karl and others (1989b). ?ce by Karl and others (1989b). ?lthin-beddedJW^Wthin-beddedtomassivedolostonemetalimestoneandmarbleloJV^VthisAWBWCWDWEWFWGWHWIWJWKWMWNWQWSWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWW@WCWDWEWFWGWPWQWRWUWVWWWXW]W^WfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWW W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWVWWWXWYWZW[W\W]W]W]WW@Ea`F>Youngest detrital zircon population at one locality 370-360 MaGSP004H2000I Survey PassJ MetamorphicK8602aADsqBQuartz-mica schistCDevonianAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  F>Youngest detrital zircon population at one locality 370-360 MaGWI007H2000IWisemanJ MetamorphicK8602bADsqBQuartz-mica schistCDevonianest detrital zircon population at one locality 370-360 MaGCH004H2000I ChandalarK8602<?5`AGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  varietiesLWCW]W_W`WaWbWcWdWeWvarietyNWvaryLW_W`WaWbWcWdWeWvaryingOWAWYW[W\WQWRWversusLW_W`WaWbWcWdWeWverybWUWVWverylighttodark-graylocallyorangeweatheringgraytoblbVUVVVvesicularxWvolcanicCWuW|W}W~W*W+W5WKWLWMWNWOWPWvolcanicrocksvolcaniclasticrocksandclasticsedimentaryuV5Vvolcaniclastic_WuWW@WRW5W>W?W@WIWJWKWLWMWNWOWPWschistAWDWEWFWHWKWLWMWNWOWPWQW`WdWfWjWmWnWoWpWqWvWwWzW{W|WAWBWFWLWMWNWOWRWWWXWYWZW[W\W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWqWrWsWWW WWWWWWWW W!W#W$W%W&W'W(W)W6W8W?W@WAWBWQWRWSWTWUWVWZW[W\W]WschistoseKWkWCW]WW(W)W\W]Wschistosevarietiesofgray-greenlithicwackelesserbrownCV]VschistswWscvstW7WsectionSWoWFWW#WsedimentaryAWBWSW\WuWSWTWfWgWhWiWjWkWlWtWuWvWwWxWyW{W5WCWDWEWFWGWHWKWLWMWNWOWPWVWWWXWYWYWYWWTWWWseparatelySWsequenceDWJWSWrWsW^W8WsequencesuW5Wsericite{WLWMWNWOWserpentiniteDWFWpWqWrWsW8WseveralSWTWaW}W W WsewardbWUWVWshaleGWRWSWYW[WtWCW]WWW7WmainlyXWZWWWmaiyumerakrWmajorLWOWPWQWAWBWYWZW[W\W_W`WaWbWcWdWeWQWRWSWTWUWmany{WLWMWNWOWmapAWCWFWGWKWSWZW]WhWrWtWwWzWCWHWIWJWKW]WfWgWhWiWjWkWlWpWqWrWsW|W}W~WWWWWWWWW(W)W7WCWDWEWFWGWHWVW\W]WmappableNWmapped_W`WyWzW{WW@WLWMWNWOW6W>WIWJWmarbleIWJWLWMWNWOWPWTWaWbWcWdWgWhWiWkWoWpWqWAWBWEWFWGWUWVWYWZW[W\W^W_W`WaWbWcWdWeWW WWWWWWWWWW#W$W%W&W*W+W9W:W;W<W=WAWBWQWRWSWTWUWWWmatrixWWWWmayGWJWNWWWmW|W^WWW WmediumMWmWqW WWmedium-beddedGWmedium-grainedGWmedium-grayXWmegacrystsMWmegafossilsAWIWXWbWUWVWfWgWhWiWjWkWlWmeta-argilliteiWkWGWWEJbbF>Youngest detrital zircon population at one locality 370-360 MaGCH004H2000I ChandalarJ MetamorphicK8602cADsqBQuartz-mica schistCDevonianAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  F>Youngest detrital zircon population at one locality 370-360 MaGCS004H2000I Christian J MetamorphicK8602dADsqBQuartz-mica schistCDevonianest detrital zircon population at one locality 370-360 MaGSE005H2000ISelawikK8602?D5bAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  bAEFDdAJFIfAg@NAMh@PEiE:j@QESkETlEUm@o@WpCZqA\r@[sA_t@^uCv@AwAcxAyA {@hA|@pA"}@oAu~A@tAy€A€@x@z€E{€B€A|€A€ F~€ @€ @€D€D€D!€@€@€@@!AG€#A€$@€%E€(D€*AE€-D€1CGK€5AE€7AE€9B€:AE€E€@B!€A@AE€BBE€DA€E@€FA€GE€I@€JCI€LA€MA€NA€O@A€PA€QA5€RA%€SA€T@A€UALbrownish-greenfWWbuffJW^Wbuild-upsJW^WbutAWLWNW\WtWSWTW_W`WaWbWcWdWeWfWgWhWiWjWkWlW7WVWcatePWcalcareousLWMW]W_W`WdWeWfWgWpWqWW@WFWHWIWJWKWRW_W`WaWbWcWdWcalcite{WLWMWNWOWcanuWcarbonaceousMWUWlWcarbonateIWNWcWEWcarbonate-andBWZWcarbonate-richOWAWBWYWZW[W\WcarboniferousSWcentimeterLW_W`WaWbWcWdWcentralFWNWPWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqW{WW@WFWGWLWMWNWOWPWQWRWUWVWchandalarEWHWKWbWcWjWoWtWvWxWyWzW{WLWMWNWOWUWVWWWXWcharacteristicMWchertAWCWRWSWTWVWWWXWsWchertyAWtWchieflybWUWVWchloritePWWW{WLWMWNWOWclasticuWclastsBWCWWWclinopyroxeneFWcmMWcoarsedW{WLWMWNWOWcoarsecrystallinemarbleorangedolomiticmarblequartz-micdVcoarse-crystallineNWcoarselyhWcoevalbWUWVWmicaLWWWiWmWGWRW_W`WaWbWcWdWeWWW W?W@Wmica-richLW_W`WaWbWcWdWeWmicaceousJW^WmicrofossilsbWUWVWmicrogabbroAWfWgWhWiWjWkWlWVWmiddleCWGWIW|W}W~WmillimetersOWAWYW[W\WQWRWmineralPWZWaWWWmineralized{WLWMWNWOWmineralsAW\W]WoW{WHWIWJWKWLWMWNWOWSWTWfWgWhWiWjWkWlW#WVWminorAWDWEWJWLWWWZW]W^WfWjWpWDWHWIWJWKWPWQWWWXW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWWWWWWWWW$W%W&W8WCWDWEWFWGWHWVWmississippianAWIWSW[WfWgWhWiWjWkWlWVWmixOWoWAWBWYWZW[W\W#WQWRWSWTWUWmixedDW8Wmkl[Wmm-cmSWTWUWmm-thickSWTWUWmn-richSWTWUWmonzoniteyWmWnWoWJdF>Youngest detrital zircon population at one locality 370-360 MaGSE005H2000ISelawikJ MetamorphicK8602eADsqBQuartz-mica schistCDevonianAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  F>Youngest detrital zircon population at one locality 370-360 MaGSH005H2000IShungnakJ MetamorphicK8602fAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianDI5dAGray, dark gray, or brownish-gray weathering, dominantly pelitic or semipelitic schist that constitutes a major unit along the length of the Schist belt. Outcrops vary from blocky and resistant (quartz-rich varieties) to platy and less resistant (mica-rich varieties), as the abundance of quartz versus mica and albite varies at centimeter to meter scales. Scattered lenses of mafic schist, calcareous schist, albite-mica schist, graphitic metaquartzite and marble up to 10's of meters thick B2are typical of the unit but volumetrically minor.  `Epeliticschistmetabasiteminorfelsicorthogneissandmeta-EVWVXVpeliticschistmetaquartzitemaficschistandotherlithologQVpeninsulabWUWVWpercentGWperidotiteDW8Wpg|WphylliteFWGWHWIWSWTWUWVWWWYW\W]W^W`WgWiWjWlWqWtWCWGWHWIWJWKWPWQWRWSWTW]WpWqWrWsWWWWWW W WWWWWW W!W*W+W6W7W?W@WCWDWEWFWGWHWZW[Wphyllitefine-grainedschistandphylloniteofthecentralbjVVVphylliteorslatesiltsonesandstonelimestoneandchertinVVVphylliticJWkW^WWphylloniteHWjWWWWW W!WZW[WpillowAWFWMWfWgWhWiWjWkWlWpWqWrWsWAWBWVWplantBWGWtWuWvWwWxWyW{WWWXWYWYWYWYWWprehnite-pumpellyiteBWpresentFW{WLWMWNWOWpWqWrWsWpreserved\W{WLWMWNWOWSWTWprimaryAWfWgWhWiWjWkWlWGbySW^W_WpWsWuWyWzWW@WFWPWQWW$W%W&W5W6W>WIWJWSWTWUWcalc-silicatePWcalcareousLWMW]W_W`WdWeWfWgWpWqWW@WFWHWIWJWKWRW_W`WaWbWcWdWeWWW WWWWWWW$W%W&W6W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWSWTWUW5WcarbonaceousMWUWlW WAWBWcarbonateIWNWcWEW9W:W;W<W=Wcarbonate-andBWZWcarbonate-richOWAWBWYWZW[W\WQWRWSWcarboniferousSWcentimeterLW_W`WaWbWcWdWeWcentralFWNWPWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqW{WW@WFWGWLWMWNWOWPWQWRWUWVWpWqWrWsWWWWW W W WWWWWWWWWWWWWWWW#W$W%W&W'W*W+W6W9W:W>W?W@WIWJWKWLWMWNWOWPWWNPPgAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGWI007H2009IWisemanJ MetamorphicK5133MgAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to Devoniannd rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGSP003H2009I Survey PassJ MetamorphicK5133gAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianoccurrenceNWoccurrencesaWoccursDWGWTWhWtWWWWWWW7W8WofAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWWWXWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W}WW@WAWBWCWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWW W W W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W]W]WMfhAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.f, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.:SfjAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane. cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane. frost-rived~W,W-W.W/W0W1W2W3W4Wfrost-rivedrubbleonslopesandbroadlowridgesglacially~V,V-V.V/V0V1V2V3V4VgarnetFWWSWTWUWgarnet-epidoteNWgeanticlinewWgenerallykW{WLWMWNWOWWgenerallyfinegrainedphyllitictoschistosegray-weatherinkVVgivetianIWglacially~W,W-W.W/W0W1W2W3W4WgneissicQWdW|WWgradeBWFWPWQWwWpWqWrWsWtWuWvWwWxWyW{WWWXWYWgradesBWtWuWvWwWxWyW{WWWXWYWgrainedBWCWkWmW{WLWMWNWOWtWuWvWwWxWyW{W|W}W~W WWWWXWYWgraniteNWyWmWnWoWoWoWoWQTjEJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGSH005H2009IShungnakJ MetamorphicK5133kAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.SUkEJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGHU004H2009IHughesJ MetamorphicK5133lAJDabBpMafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane CEarly Jurassic to DevonianAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.TlEJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGBT005H2009IBettlesJ MetamorphicK5133`iprobableGWprobablyFWpWqWrWsWproperyWproterozoic}W W WprotolithEWWWXWZ!oAKgBGranitic rocks C CretaceousDGranite, quartz monzonite, and granodiorite of the northern Ruby terrane, exposed along the southern boundary of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGBT005H2037IBettles JIgneousK2492pAKJmBMelange C CretaceousDGranite, quartz monzonite, and granodiorite of the northern Ruby terrane, exposed along the southern boundary of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGBT005H2037IBettles JIgneousK2492pAKJmBMelangeC CretaceousDGranite, quartz monzonite, and granodiorite of the northern Ruby terrane, exposed along the southern boundary of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGBT005H2037IBettles JIgneousK2492pAKJmBMelangedrangle.F/K-Ar dates from south of map area are 96-112 MaGBT005H2037IBettles JIgneousK2530pAKJmBMelangeERadiolarians, conodontsGAR004H2092I Ambler RiverK5145rocksofthehammondrivershearzoneoV#VrocksofthekivivikcreeksequenceSVrubywWrubyschistwVsandstoneBW\WDWSWTWtWuWvWwWxWyW{WWWWXWYWschistKWLWNWOWPWQWnWvWwWAWBWYWZW[W\W_W`WaWbWcWdWeWW'W(W)WQWRWSWTWUW\W]Wschistandmarbleundividedarrigetch-igikpakthermalhighPVschistandparagneissQVschistoseCW]WsedimentaryRWrWtWuW~W,W-W.W/W0W1W2W3W4W5W7WsedimentaryrocksRVtV7VsequenceMWSWsWAWBWserpentinite8shaleBWGWTWVW]WCWHWIWJWKW]WtWuWvWwWxWyW{WWCWDWEWFWGWHWWWXWYWshearoW#WsiliceousUWlW WsubunitBWZWKWLWMWNWOWPWSWTWUWsurficial~W,W-W.W/W0W1W2W3W4Wsurficialsedimentarydepositsundivided~V,V-V.V/V0V1V2V3V4V4V4Vkhs/#kjmpqrskm:kstuvwxy{WXYkvg|}~mcmcpmdemder3mdkDWWmdk101DVVmkklmklmlmumzdm2mzpzs8opc#9opccEW:;W<W=Wopcc541EV;V<V=Vpcam&FWWpcam572FVVpcg= pzb, pzbq- pzbs' pzj+pzm(pzp*pzpc pzpg !Z[pzsg ()\]pzsmpzw)G*W+Wpzw572*V+Vpzzb1pzzbs6pzzcm%pzzem$pzzg,-./01234qtb8scvs55spl 6666666 6666WiWjWkWlWandAWBWCWGWHWPWQWTWUWVW_W`WeWlWrWuWW@WCWDWRW]WfWgWhWiWjWkWlWtWuWvWwWxWyWzW{W|W}W~WWW WWWWWWW W!W"W5WangayuchamAWfWgWhWiWjWkWlWangayukaqsraqfWFWWWW\pCCretaceous to JurassicATectonic assemblage of meter to kilometer-scale fault slivers of pillow basalt, mafic schist, metagabbro, metalimestone, metachert, metagraywacke, phyllite, and rare serpentinite exposed in low hills in the south central and southwestern part of the map area. Metamorphic grade varies from slice to slice and ranges from pumpellyite to greenschist-facies; relict igneous clinopyroxene is present in some metagabbros. One sliver of mafic schist on the Baird Mountains/Ambler River quadrangle boBcundary contains abundant blue amphibole, probably crossite. This unit is part of the Phyllite belt.QERadiolarians, conodontsGAR004H2092I Ambler RiverJ MetamorphicK5145qAKJmBMelangeCCretaceous to JurassicRadiolarians, conodontsGSP003H2092I Survey PassK5145\_rAKJmBMelangeCCretaceous to JurassicATectonic assemblage of meter to kilometer-scale fault slivers of pillow basalt, mafic schist, metagabbro, metalimestone, metachert, metagraywacke, phyllite, and rare serpentinite exposed in low hills in the south central and southwestern part of the map area. Metamorphic grade varies from slice to slice and ranges from pumpellyite to greenschist-facies; relict igneous clinopyroxene is present in some metagabbros. One sliver of mafic schist on the Baird Mountains/Ambler River quadrangle boBcundary contains abundant blue amphibole, probably crossite. This unit is part of the Phyllite belt.QERadiolarians, conodontsGSH005H2092IShungnakJ MetamorphicK5145sAKJmBMelangeCCretaceous to JurassicnakJ MetamorphicK5145sAKJmBMelangeCCretaceous to Jurassiclarians, conodontsGHU003H2092IHughesK5145Z[qATectonic assemblage of meter to kilometer-scale fault slivers of pillow basalt, mafic schist, metagabbro, metalimestone, metachert, metagraywacke, phyllite, and rare serpentinite exposed in low hills in the south central and southwestern part of the map area. Metamorphic grade varies from slice to slice and ranges from pumpellyite to greenschist-facies; relict igneous clinopyroxene is present in some metagabbros. One sliver of mafic schist on the Baird Mountains/Ambler River quadrangle boBcundary contains abundant blue amphibole, probably crossite. This unit is part of the Phyllite belt.QERadiolarians, conodontsGSP004H2092I Survey PassJ MetamorphicK5145cmMWAWBWcm-scaleSWTWUWcoarsedW{WLWMWNWOWWcoarsecrystallinemarbleorangedolomiticmarblequartz-micdVVcoarse-crystallineNWcoarselyhWWWWWWWcodedyWcoevalbWUWVW_tAKsB"Conglomerate, sandstone, and shaleC CretaceousAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EYSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GAR004H2038I Ambler RiverJ SedimentaryK1990uAKsB"Conglomerate, sandstone, and shaleSedimentaryK1990uAKsB"Conglomerate, sandstone, and shale[^sATectonic assemblage of meter to kilometer-scale fault slivers of pillow basalt, mafic schist, metagabbro, metalimestone, metachert, metagraywacke, phyllite, and rare serpentinite exposed in low hills in the south central and southwestern part of the map area. Metamorphic grade varies from slice to slice and ranges from pumpellyite to greenschist-facies; relict igneous clinopyroxene is present in some metagabbros. One sliver of mafic schist on the Baird Mountains/Ambler River quadrangle boBcundary contains abundant blue amphibole, probably crossite. This unit is part of the Phyllite belt.QERadiolarians, conodontsGHU004H2092IHughesJ MetamorphicK5145KVplatyLWhW_W`WaWbWcWdWeWWWWWWWplugsHWWW W!WZW[WplutonNWPW{WLWMWNWOWplutons{WLWMWNWOWpodsMWAWBWpolygonyWzWpoorjWWWpoorlyBWoWtWuWvWwWxWyW{W#WWWXWYWporphyriesMWAWBWporphyroblastic{WLWMWNWOWpossibleIWMWXWAWBWpreciseIWprecludesSWpredominantlyCW|W}W~WpredominatesNWprehnite-pumpellyiteBWtWuWvWwWxWyW{WWWXWYWpresentFW{WLWMWNWOWpWqWrWsWpreserved\W{WLWMWNWOWSWTWprimaryAWfWgWhWiWjWkWlWVWVWVWVW amblerriverAVIVJVMVNVTVWVYVmVnVpV{VVHVRVSVUVYVZV_VpVtVVVV VVVVV(V,V6V8V9VFVLVbairdBWFWHWLWSWUWVWXWZW[W\W]W^W_WaWbWcWeWfWhWjWlWrWsW|W}W~WAWBWEWFW WGWKW]WbairdmountainsBVFVHVLVSVUVVVXVZV[V\V]V^V_VaVbVcVeVfVhVjVlVrVsV|V}V~VAVBVEVFV VGVKV]VbettlesXlo{~4Ychandalar/4678:CGKMQVW\bhmw!&)+/5:=CIOU selawikdx1Q\shungnakL^ejry|2RVWsurveyKWOWPWQW`WgWqW@WDWIWOWTW`WfWqWuWWWWW WWWWW$W'W-W;W?WAWEWMWSWZWsurveypassKVOVPVQV`VgVqV@VDVIVOVTV`VfVqVuVVVVV VVVVV$V'V-V;V?VAVEVMVSVZVwiseman$)+59JN[agv  #%*.7<>@BDNT igneous89mnometamorphic  !"#$%&'()*+,-./0167:;<=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklpqrs  !#$%&'()*+689:;<=>?@ABCDEFGHIJKLMNOPQRSTUVZ[\]]Äq.ÄcWXÄ&Ä!>wAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GCH004H2038I ChandalarJ SedimentaryK1990xAKsB"Conglomerate, sandstone, and shaleC Cretaceous2€\@D€]@€]@\D€]@€]@basinBWCWtWuWvWwWxWyW{W|W}W~WWWXWYWbeGWJWMWNWQWWWuWxW|W^WWW5WAWBWKWLWMWNWOWPWbeaucoup^W_WW@WPWQW>WIWJWKWLWMWNWOWPWbeenAWMWUWWW{WDWLWMWNWOWfWgWhWiWjWkWlWWWWAWBWVWbeigeaWbeigetoorange-weatheringlaminatedpartlyargillaceoustoaVbelowDW8WbeltDWFWGWHWIWKWLWMWNWOWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWvWwW|WW@WAWBWCWFWGWPWQWRWUWVWYWZW[W\W]W_W`WaWbWcWdWeWpWqWrWsWWWWW W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W6W8W9W:W>W?W@WAWBWIWJWKWLWMWNWOWPWQWRWSWTWUWZW[W\W]W]W]WrangesFWpWqWrWsWranging{WLWMWNWOWrareAWFWMWiWGWfWgWhWiWjWkWlWpWqWrWsW*W+WAWBWVWratiosBWtWuWvWwWxWyW{WWWXWYWrecessiveoW#WrecognizedHWWW W!WZW[WrecordedwWredWWWWreddishJW^Wreddish-brownqWWredstoneNWregionallyBWtWuWvWwWxWyW{WWWXWYWreiseryWzWrelationNWrelations{WLWMWNWOWrelativelyoWpW#W$W%W&WrelativelyhomogeneousassemblagedominatedbylightgreenispV$V%V&VrelictFWpWqWrWsWremainderyWremnantMWAWBWremnants{WLWMWNWOWreportedIWZWWWrepresentCWJW^W|W}W~Wrepresents[W[W[Ws[W"marinemollusksoflateearlycretaceousalbianageCV|V}V~VmegafossilsAW^W_WrWW@WPWQWRWfWgWhWiWjWkWlW>W?W@WIWJWKWLWMWNWOWPWVWmegafossilsandconodontsaremiddleandearlylatedevonian_VV@VRV>V?V@VIVJVKVLVMVNVOVPVmeramecianXWmeramecian-earlyXWmicrofossilsuW5WmicrofossilsbrachiopodstrilobitesgraptolitesconodontsuV5Vmid-famenniansWmiddle]W^W_WgWhWW@WHWIWJWKWPWQWRW WWWWWWW>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWmolluscanYWWW :{AKsB"Conglomerate, sandstone, and shaleC Cretaceous that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GHU004H2038IHughesJ SedimentaryK1990{AKsB"Conglomerate, sandstone, and shaleC Cretaceousr8metamorphismPWZW\WaWvWSWTWWWWR€VAMetamorphosed pillow basalt, hyaloclastic breccia, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGSH005H2009IShungnakJ MetamorphicK5133B"Conglomerate, sandstone, and shaleC CretaceousAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GBM004H2038IBaird MountainsJ SedimentaryK1990AKvgB%Volcanic-clast graywacke and mudstoneC Cretaceous> themSWthereMWAWBWthermalQWtheseaWBWFWZWWSWTWUWthickDWGWLWMW]WgWxWHWIWJWKW_W`WaWbWcWdWeW W8WAWBWthinGWJWWW]WoWFWHWIWJWKW^WWWW#WCWDWEWFWGWHWSWTWUWW)hunt[WhyaloclasticAWfWgWhWiWjWkWlWVWhydrothermalJW^WidentifiedWWWWigneousAWFWfWgWhWiWjWkWlWpWqWrWsWVWimbricateAWfWgWhWiWjWkWlWVWimpurekWqWWWinAWBWCWDWEWFWGWHWIWJWKWMWNWPWQWRWSWTWUWVWWWXWYWZW[W]W^W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWtWuWvWwWxWyWzW{W|W}WBWCWEWFWGWHWIWJWKWLWMWNWOWPWQWUWVWWWXWZW]W^WfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWWWWW W W W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W;W<W=WAWBWVWWWXWYWZW[W\W]W]W]W:APelitic schist, metabasite, minor felsic orthogneiss and meta-ultramafic rock exposed in two small areas along the Kobuk fault zone in the northeast Bettles and southwest Chandalar quadrangles. The rocks exhibit amphibolite-facies metamorphic assemblages, mylonitic foliations and well-developed stretching lineations. Age and affinity of the protolith rocks is unknown. This unit is part of the Mosquito terrane. (Tiny sliver on southern bounday of Wiseman)F'54.8 +/- 1.3 Ma white mica cooling age GWI007H2008IWiseman J MetamorphicK8852"u>}AKvgB%Volcanic-clast graywacke and mudstoneC CretaceousAFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E5Marine mollusks of Late Early Cretaceous (Albian) ageGSH002H2091I Shungnak J SedimentaryK2180}AKvgB%Volcanic-clast graywacke and mudstoneC Cretaceousretaceous (Albian) ageGSH002H2091I Shungnak J SedimentaryK2180}AKvgB%Volcanic-clast graywacke and mudstoneC CretaceousE6Marine mollusks of Late Early Cretaceous (Albian) age GHU002H2091IHughes K2180">|AKvgB%Volcanic-clast graywacke and mudstoneC Cretaceoust grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GBT002H2038IBettlesJ SedimentaryK1990|AKvgB%Volcanic-clast graywacke and mudstoneC CretaceouswithinOWQWhW{WAWFWLWMWNWOWYW[W\WWWWWWWWQWRWworkers^W_WW@WPWQW>WIWJWworld-classMWAWBWyellowish-greenDW8WyieldIWyieldedGWyorkbWUWVWyoungerbWUWVWyukon-koyukukBWCWtWuWvWwWxWyW{W|W}W~WWWXWYWzoneEWoWWWXW#WzonesFWWacrotretidcWEW9W:W;W<W=WageBWCWMWhWtWtWuWvWwWxWyW{W|W}W~WWWWWWW7WAWBWWWXWYWagnostidcWEW9W:W;W<W=WalbianCW|W}W~WalgaesWandJWNWRWSWTWVWYWZW\W^W_W`WaWcWrWsWtWW@WDWEWPWQWRWSWTW^WWWWWWW6W7W9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWare_WW@WRW>W?W@WIWJWKWLWMWNWOWPWarthropodscWEW9W:W;W<W=W=W=WWWWWW5W6W7W9W:W}i1metamorphic|W}W~WVWWWXWYWmetamorphic|rmetamorphism@imetamorphosed@metasiltstone@mica@Hmore@northern@occurrence@Oolive@one@orange@parallel@partially@pelitic@peliticschistmetabasiteminorfelsicorthogneissandmeta-@Kplaty@`probable@Vprotoliths@quadrangle@quadrangles@quartz-rich@ranges@fresemble@river@rock@scattered@schist@Bsediments@y4AMcBQuartz-rich conglomerateCMississippian?etaceousAFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E5Marine mollusks of Late Early Cretaceous (Albian) ageGBT004H2091IBettles J SedimentaryK2180AMcBQuartz-rich conglomerateCMississippian?BT004H2091IBettles J SedimentaryK2180AMcBQuartz-rich conglomerateCMississippian?H2077I Survey Pass K6370o}AFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E6Marine mollusks of Late Early Cretaceous (Albian) age GHU004H2091IHughes J SedimentaryK2180~AKvgB%Volcanic-clast graywacke and mudstoneC CretaceousWsoutheastxWzWsoutheasternvWWsouthernAWDWEWHWpWwWyWzW|W}WfWgWhWiWjWkWlWmWnWoW W WWW W!W$W%W&W*W+W8WVWZW[WsouthwestEWPWWWXWsouthwesternDWFWIWpWqWrWsW8WsparseBWtWuWvWwWxWyW{WWWXWYWspessartineSWTWUWsporesGWstabilizedPWstableQWstaurolitevWWstraddlingpW$W%W&WstrainedoW#WstrataNWbWUWVWstrataboundJW^WstratifiedBWtWuWvWwWxWyW{WWWXWYWstratigraphicallySWstretchedWWWWWWWamphiboleFWaWpWqWrWsWamphibolitefWFWWWamphibolitemetaquartzitecalcareousschistmetapeliteandafVFVVVamphibolite-faciesEWFWWWXWWanAWNWFWfWgWhWiWjWkWlWWVWWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWmWnWoWpWqWrWsWtWuWvWwWyWzW{W}W~WW@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W(W)W*W+W,W-W.W/W0W1W2W3W4W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWzI€AMDkBKanuyut ConglomerateC'Lower Mississippian? and Upper Devonian, quartzite-, and slate-clast conglomerate with minor thin layers of metasandstone and phyllite exposed in the Ambler River, Survey Pass, and Wiseman quadrangles. Quartz and chert clasts are most common; chert clasts are varicolored. The matrix of the conglomerate is composed of quartz, white mica, and chlorite, and clasts are typically stretched. Phyllite may be gray, green, or red. Rocks included in the unit resemble Kekiktuk Conglomerate of Brosg and others (1962), Band lack any age-diagnostic fossils. Kyanite has been identified in at least four exposures of the unit in the Survey Pass quadrangle. This unit is part of the Central belt.GWI006H2077IWiseman J MetamorphicK6370€AMDkBKanuyut ConglomerateC'Lower Mississippian? and Upper DevonianlomerateC'Lower Mississippian? and Upper DevonianEJEchinoderm debris, brachiopods, mollusks, cephalopods, and plant fragmentsGAR004H2028I Ambler River K6915tAQuartz- , chert-, quartzite-, and slate-clast conglomerate with minor thin layers of metasandstone and phyllite exposed in the Ambler River, Survey Pass, and Wiseman quadrangles. Quartz and chert clasts are most common; chert clasts are varicolored. The matrix of the conglomerate is composed of quartz, white mica, and chlorite, and clasts are typically stretched. Phyllite may be gray, green, or red. Rocks included in the unit resemble Kekiktuk Conglomerate of Brosg and others (1962), Band lack any age-diagnostic fossils. Kyanite has been identified in at least four exposures of the unit in the Survey Pass quadrangle. This unit is part of the Central belt.GSP004H2077I Survey Pass J MetamorphicK6360€AMcBQuartz-rich conglomerateCMississippian?x{€AQuartzite, pebbly quartzite, conglomerte, and minor siltstone. Exposed in a few small areas of northwestern Baird Mountains quadrangle, northeastern Ambler River quadrangle, and widely distributed in northern Survey Pass quadrangle. Semischistose and mylonitic textures and mineral assemblages suggesting lower greenschist facies metamorphism reported mainly from western part of map area.EJEchinoderm debris, brachiopods, mollusks, cephalopods, and plant fragmentsGAR004H2028I Ambler River J MetamorphicK6915€AMDkBKanuyut ConglomerateC'Lower Mississippian? and Upper DevonianAQuartzite, pebbly quartzite, conglomerte, and minor siltstone. Exposed in a few small areas of northwestern Baird Mountains quadrangle, northeastern Ambler River quadrangle, and widely distributed in northern Survey Pass quadrangle. Semischistose and mylonitic textures and mineral assemblages suggesting lower greenschist facies metamorphism reported mainly from western part of map area.z€EJEchinoderm debris, brachiopods, mollusks, cephalopods, and plant fragmentsGSP004H2028I Survey PassJ MetamorphicK6915€AMDk_101B)Kanuyut Conglomerate and Noatak SandstoneC'Lower Mississippian? and Upper DevonianDQuartzite, pebbly quartzite, conglomerate, and minor siltstone. This unit includes exposures where Kanayut has not been differentiated from Noatak Sandstone. EJEchinoderm debris, brachiopods, mollusks, cephalopods, and plant fragmentsGWI007H2089IWiseman J MetamorphicK6914€AMklB0Kayak Shale of Endicott Group and Lisburne GroupC MississippianDPhyllite or slate, siltsone, sandstone, limestone, and chert in two small exposures in the northwestern Baird Mountains quadrangle and in a larger area in the Survey Pass quadrangle. EOstracodes, brachiopods, bryozoans, and echinoderm debris, conodonts, crinoid, bryozoan, and coralline debris, brachiopods, gastropods, sponge spicules, endothyrid foraminifersGSP004H2061I Survey Pass J MetamorphicK6328€AMu€AAmphibolite, metaquartzite, calcareous schist, metapelite, and a few small bodies of metagranite and metagabbro, exposed in the northeastern Baird Mountains quadrangle around Mt. Angayukaqsraq, in the south central Baird Mountains quadrangle near the Kobuk River, and in the northeastern Ambler River quadrangle. Light-gray to tan weathering metagranite and cream to brownish-green metagabbro occur as small bodies up to 100 m across and are volumetrically minor. This unit is part of the CentrBal belt.FQ40Ar/39Ar - 680 Ma metamorphic age, overprinting event - 40Ar/39Ar age of 120 MaGAR004H2013I Ambler River J MetamorphicK9300€ApCam_572B7Metamorphic rocks of Mt. Angayukaqsraq, remetamorphosedC Proterozoicrmetalimestoneandlessermetasandstonemetasiltstonephyllit^VPVQVmetamorphicAWBWCWEWFWwWWWXWfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{W{W'€ F{U-Pb zircon ages: southern Baird Mtns quad - 705+/-35 Ma; Ernie Lake pluton - 971+/-5 Ma; Mt. Angayukaqsraq - 750 +/- 6 MaGSP004H2011I Survey Pass J MetamorphicK9060€ ApCgBGranitic orthogneissC PaleozoicDuMetagranitic rocks of several Proterozoic ages exposed in southern Baird Mountains and western Wiseman quadrangles. F{U-Pb zircon ages: southern Baird Mtns quad - 705+/-35 Ma; Ernie Lake pluton - 971+/-5 Ma; Mt. Angayukaqsraq - 750 +/- 6 MaGWI007H2011IWiseman J MetamorphicK9060€ APzbB%Black phyllite and siliceous phylliteC Paleozoic?DGray to dark gray carbonaceous phyllite, locally silica rich, exposed in the Central belt in the western Ambler River quadrangle. This unit is part of the Central belt.GAR004H2066I Ambler River J MetamorphicK7235|~€AAmphibolite, metaquartzite, calcareous schist, metapelite, and a few small bodies of metagranite and metagabbro, originally metamorphosed at amphibolite-facies rocks and overprinted by an albite epidote amphibolite facies event. Mafic outcrops in these areas are massive dark blue to dark-bluish-green with small knots of olive-colored epidote after garnet. Dolostone and marble occur along shear zones within the albite-epidote amphibolite facies rocks. The albite-epidote amphibolite facieBys rocks experienced a blueschist facies overprint detectable only in thin section. This unit is part of the Central belt.gFQ40Ar/39Ar - 680 Ma metamorphic age, overprinting event - 40Ar/39Ar age of 120 MaGAR004H2068I Ambler River J MetamorphicK9300€ ApCgBGranitic orthogneissC PaleozoicDuMetagranitic rocks of several Proterozoic ages exposed in southern Baird Mountains and western Wiseman quadrangles. AunitsKWOWSWmWoWAWBWYWZW[W\W W#W(W)W6WQWRWSWTWUW\W]WunknownEWaWWWXWupGWLWMW]WfWgWoW{WHWIWJWKWLWMWNWOW_W`WaWbWcWdWeWW W#WAWBWupperCW|W}W~WvaluesUWvaricoloredWWWWvariesFWHWLW_W`WaWbWcWdWeWpWqWrWsWWW W!WZW[W[W~€ APzbqBBlack quartziteC Paleozoic?A%Black weathering, fine to medium grained black metaquartzite exposed in the western Schist belt along the contact between units Dsq and DPsc. May contain small amounts of mica and show segregation of quartz and graphite in layers parallel to foliation. This unit is part of the Central belt.%GBM004H2065IBaird Mountains J MetamorphicK8602t belt along the contact between units Dsq and DPsc. May contain small amounts of mica and show segregation of quartz and graphite in layers parallel to foliation. This unit is part of the Central belt.%GBM004H2065IBaird Mountains J MetamorphicK8602his unit is part of the Central belt.GAR004H2066I Ambler River J Metamorphic€ APzbqBBlack quartziteC Paleozoic?GBM004H2065IBaird Mountains #€XAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EYSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GHU004H2038IHughesJ SedimentaryK1990€YAKsB"Conglomerate, sandstone, and shaleC Cretaceousg€ APzbsBBlack metasedimentary rocksC PaleozoicDDark gray to black phyllite and calcareous phyllite with dark gray to orange-weathering marble and dolostone layers up to 50 m thick, exposed in the northeastern Survey Pass and northwestern Wiseman quadrangles. This unit is part of the Central belt.E=Brachiopods Middle Devonian or Frasnian (early Late Devonian)GWI007H2085IWiseman J MetamorphicK6331€APzjB'Metasedimentary rocks of Jesse MountainC PaleozoicAGenerally fine grained, phyllitic to schistose, gray-weathering meta-argillite, black-weathering metaquartzite, marble, and brown weathering impure marble, exposed in a single area in the eastern Wiseman quadrangle. This unit is part of the Central belt.E'Conodonts; brachiopods; coral fragmentsGCH004H2032I Chandalar J MetamorphicK6850€APzmBMarbleC PaleozoicorphicK6850€APzmBMarbleC Paleozoic,DGray to dark gray carbonaceous phyllite, locally silica rich, exposed in the Central belt in the western Ambler River quadrangle. This unit is part of the Central belt.GBM004H2066IBaird Mountains J MetamorphicK7235&bryozoanVWYWsWWWW]QchandalarEWHWKWbWcWjWoWtWvWxWyWzW{WLWMWNWOWUWVWWWXWmWnWoWWWWWW W!W#W(W)W7W9W:WZW[W\W]WcharacteristicMWAWBWchertAWCWRWSWTWVWWWXWsWfWgWhWiWjWkWlW|W}W~WWWWVWchertyAWtWfWgWhWiWjWkWlW7WVWchieflybWUWVWchloritePWWW{WLWMWNWOWWWclasticuW5WclastsBWCWWWtWuWvWwWxWyW{W|W}W~WWW*W+WKWLWMWNWOWPWWWXWYWclinopyroxeneFWpWqWrWsWsWsW!€DWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGWI007H2023IWisemanJ MetamorphicK6983€APzmBMarbleC PaleozoicDWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGCH004H2023I ChandalarJ MetamorphicK6983€APzmBMarbleC Paleozoic€DWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGAR004H2023I Ambler RiverJ MetamorphicK6983€APzmBMarbleC PaleozoicDWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGSP004H2023I Survey PassJ MetamorphicK6983€APzmBMarbleC PaleozoicjendothyridVWWfamennian\WSWTWfammenian]WHWIWJWKWCWDWEWFWGWHWbrachiopodslatefrasniantoearlyfammenianmollusksechino]VHVIVJVKVCVDVEVFVGVHVbrachiopodsmiddledevonianorfrasnianearlylatedevoniangV V!€APzmBMarbleC PaleozoicDWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGSE005H2023ISelawikJ MetamorphicK6983ozoicDWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGSE005H2023ISelawikJ MetamorphicK6983€APzpBPhylliteC Paleozoic?AKPhyllite, fine-grained schist, and phyllonite of the Central belt that underlie areas of poor exposure in the northeastern Baird Mountains quadrangle, western Ambler River quadrangle, and northwestern Chandalar quadrangle. Locally contains minor lenses of metalimestone and metaconglomerate. This unit is part of the Central belt.KGAR004H2030I Ambler River J MetamorphicK5560€APzpBPhylliteC Paleozoic?ikJ MetamorphicK5525€APzpBPhylliteC Paleozoic?AKPhyllite, fine-grained schist, and phyllonite of the Central belt that underlie areas of poor exposure in the northeastern Baird Mountains quadrangle, western Ambler River quadrangle, and northwestern Chandalar quadrangle. Locally contains minor lenses of metalimestone and metaconglomerate. This unit is part of the Central belt.KGAR004H2030I Ambler River J MetamorphicK5560€APzpBPhylliteC Paleozoic?*devonian-mississippiUWearlyBWCWXW]W^W_WgWW@WHWIWJWKWPWQWRWtWuWvWwWxWyW{W|W}W~W W>W?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWWWXWYWearly-earlyhWWWWWWWechinodermNWTWVWYWZWDWWWWWWWechinodermdebrisbrachiopodsmolluskscephalopodsandplantTVZVDVVVVechinoderms\W]WHWIWJWKWSWTWCWDWEWFWGWHWemsian-eifelianhWWWWWWWW €APzZcmB1Metasedimentary and metavolcanic rocks, undividedCPaleozoic and Proterozoic?DHeterogeneous assemblage of interlayered calcareous, mafic, and siliceous rocks exposed in the central Baird Mountains, Ambler River, and Wiseman quadrangles. This unit is part of the Central belt.E ConodontsGAR004H2046I Ambler RiverJ MetamorphicK8655€APzZcmB1Metasedimentary and metavolcanic rocks, undividedCPaleozoic and Proterozoic?DHeterogeneous assemblage of interlayered calcareous, mafic, and siliceous rocks exposed in the central Baird Mountains, Ambler River, and Wiseman quadrangles. This unit is part of the Central belt.E ConodontsGSP004H2046I Survey PassJ MetamorphicK8655€APzZcmProterozoic?DHeterogeneous assemblage of interlayered calcareous, mafic, and siliceous rocks exposed in the central Baird Mountains, Ambler River, and Wiseman quadrangles. This unit is part of the Central belt.E ConodontsGSP004H2046I Survey PassJ MetamorphicK8655€APzZcmm€AKPhyllite, fine-grained schist, and phyllonite of the Central belt that underlie areas of poor exposure in the northeastern Baird Mountains quadrangle, western Ambler River quadrangle, and northwestern Chandalar quadrangle. Locally contains minor lenses of metalimestone and metaconglomerate. This unit is part of the Central belt.KGCH004H2030I ChandalarJ MetamorphicK5560€APzZbB,Metasedimentary rocks of Bluecloud Mountain CPaleozoic to Proterozoic?A2Light, medium, and dark gray phyllite, dark gray to black metaquartzite, dark gray and grayish-brown calcareous phyllite, and reddish-brown weathering impure marble exposed in fault-bounded lenses along the Schist belt-Central belt contact in the Wiseman quadrangle. This unit is part of the Central belt.2GWI007H2002IWiseman J MetamorphicK8604€APzZbsBBiotite schistCPaleozoic to Proterozoic?=€EEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GSP004H2044I Survey PassJ MetamorphicK7225€FADhf_101B$Hunt Fork Shale - foliated exposuresC Late DevonianA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `EjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GAR004H2044I Ambler RiverJ MetamorphicK7225€GADhf_101B$Hunt Fork Shale - foliated exposuresC Late Devonianl BtheWWWWWWWW W!W#W$W%W&W'W(W)W*W+W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]WtheiryWzWWzW,YpaleozoicandproterozoiceVVVVVpaleozoictoproterozoicdVpVqVvVwV|VVVV$V%V&VproterozoicEWOWPWQWcWdWeW&nWpWqWvWwW|WAWBWEWFWWXWYWZW[W\WWWWWWWW$W%W&W'W9W:W;W<W=WQWRWSWTWUWproterozoictopaleozoicnV'VquaternaryxW>,-./01234quaternaryortertiaryxVsilurianJW uW^W5W6siluriantocambrianuV5VtertiaryxWtoAWDWEWFWOWPWQWRWSWaWbWcWdWnWpWqWrWtWuWvWwW|WAWBWEWUWVWWWXWYWZW[W\WfWgWhWiWjWkWlWpWqWrWsWWWW$W%W&W'W5W7W8W9W:W;W<W=WQWRWSWTWUWVWtriassictW7WtriassictocarboniferoustV7VupperZWDWWWWZWDWWWWWW €A Coarse crystalline marble, orange dolomitic marble, quartz-mica schist, metaquartzite, calcareous schist, graphitic metaquartzite, and metabasite exposed in eastern Survey Pass and western Wiseman quadrangles. Locally gneissic. This unit is part of the Central belt. F*Protolith intruded by 971 Ma granitic rockGSP004H2012I Survey Pass J MetamorphicK8611€APzpgBPhyllite and graywackeC Paleozoic?ADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thosebo sedimentary345>tuvwxy{|}~,-./0123457WXYtectonite2-./01234ÃF8Ä*tuvwxyz{WXYÄ2|}~Ä59mnoÄ7!:Ä7a/#ÄE8ÄZb2ÄaÄaÄa47ÄbDfghijklVÄbVpqrsÄfq*Äfv !"Z[Äf ÄsÄtÄtÄt1Ät9ÄtB' ÄtqÄtvÄw 6Äx155Äya+ÄzSTÄz%DÄz&Äz6HIJKÄz8 )?@G^*+>IJÄzbPQÄzR?@ÄzKLMNOPÄz!"UVÄz3Äz(Ä ()\]ÄC]Ä6CDEFGHÄa;LMNOÄq ABÄ6, ÄqÄrÄQ:ÄRE;<=Ä6Ä -_`abcde Ä0$%&Ä1ÄAY[\QRÄBZÄSTUÄ"$Äf%Äq'Är.ÄcWXÄV<Äq= Ä&FÄ67Ä!>,-./01234ÄF8€B in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GSP004H2007I Survey PassJ MetamorphicK55650€B in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GAR004H2007I Ambler RiverJ MetamorphicK5565€APzpgBPhyllite and graywackeC Paleozoic?ADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to those €!B in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GCH004H2007I Chandalar J MetamorphicK5565€"APzpgBPhyllite and graywackeC Paleozoic?ADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to those/€ZADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thoseB in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GSP004H2007I Survey PassJ MetamorphicK5565€[APzpgBPhyllite and graywackeC Paleozoic?rgroupTWVW[WaWWhammondoW#WhighPWhillsJW^Whunt]WHWIWJWKWCWDWEWFWGWHWhuntforkshale]VHVIVJVKVhuntforkshalefoliatedexposuresCVDVEVFVGVHVigneousrWigneousandsedimentaryrocksofthemaiyumerakmountainsrViron-richRW?W@WjessekWWkanuyutZWDWWWW@€#AKhsB%Rocks of the Hammond River shear zoneC Cretaceous?o black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thoseB in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GHU003H2007IHughes J MetamorphicK 5560 & 5565€#AKhsB%Rocks of the Hammond River shear zoneC Cretaceous?sB%Rocks of the Hammond River shear zoneC Cretaceous?roterozoic?GWI006H2022IWiseman  €&CPaleozoic to Proterozoic?AjRelatively homogeneous assemblage dominated by light greenish-gray fine-grained quartz-rich schist, typically accompanied by minor layers of metaconglomerate, marble, and calcareous schist. Exposed in the southern Central belt in the western Survey Pass quadrangle and straddling the Wiseman/Chandalar quadrangle boundary. This unit is part of the Central belt.jEConodontGCH004H2021I ChandalarJ MetamorphicK8603€'APzZmB Mafic schistCProterozoic? to Paleozoic?DDark green weathering foliated mafic schist exposed in one area on the boundary between the Ambler River and Survey Pass quadrangles. This unit is part of the Central belt.GSP004H2047I Survey PassJ MetamorphicK8661€#AHeterogeneous mix of finely laminated, mostly mylonitic lithologies derived in part from adjacent units exposed in the eastern Wiseman and western Chandalar quadrangles. Unit is recessive, poorly exposed, and includes large (up to 0.5 km across) bodies of black quartzite and smaller exposures of quartz-rich schist, metagabbro, dark brown marble, and relatively undeformed metasandstone and metasiltstone. In thin section, minerals are strained and broken. No age control available. The uniBqt encompasses a zone of deformation between the Schist and Central belts. This unit is part of the Central belt._GWI007H2022IWiseman J MetamorphicK2650€$APzZqsB!Quartz-rich metasedimentary rocksCPaleozoic to Proterozoic?C+marblesNWmarginzWmarineSWmaroon\WSWTWmassiveBWJWKWMWUW]WaWbWhW|WFWHWIWJWKWUWVW^WtWuWvWwWxWyW{WWWWWWWW(W)WAWBWWWXWYW\W]WmatrixWWWWmayGWJWNWWWmW|W^WWW Wmayfield6Wmdcp`WmediumMWmWqW WWAWBWmedium-beddedGWmedium-grainedGWmedium-grayXWmegacrystsMWAWBWmegafossilsAWIWXWbWUWVWfWgWhWiWjWkWlWVWmelangerWmeta-argilliteiWkWGWW*W+W+W$€(APzsgB Mafic schistC Paleozoicic? to Paleozoic?DDark green weathering foliated mafic schist exposed in one area on the boundary between the Ambler River and Survey Pass quadrangles. This unit is part of the Central belt.GSP004H2047I Survey PassJ Metamorphic€(APzsgB Mafic schistC Paleozoical belt in the western Survey Pass quadrangle and straddling the Wiseman/Chandalar quadrangle boundary. This unit is part of the Central belt.jEConodontGCH004H2021I ChandalarJ MetamorphicK8603€'APzPmB Mafic schistCProterozoic? to Paleozoic?DDark green weathering foliated mafic schist exposed in one area on the boundary between the Ambler River and Survey Pass quadrangles. This unit is part of the Central belt.GSP004H2047I Survey PassJ Metamorphic€(APzsgB Mafic schistC Paleozoic47I Survey PassJ Metamorphic€(APzsgB Mafic schistC PaleozoicwhereMWQWtWwWDWW7WAWBWwhiteMWNWWWhWiWGWWWWWWWWWAWBWwhitetograylesscommonlyblackfinetocoarselycrystallihVVVVVVVwidelyZWWWwisemanEWHWRWWWYWcWdWeWgWkWoWqWtWuWwW}WWWWW W W WWWWWWWWWW W!W#W5W7W9W:WZW[W[WRcfoliationmW WfoliationsEWWWXWfork[WformNWformationRW^W_WtWW@WPWQW7W>WIWJWKWLWMWNWOWPWformsGWfossilbWUWVWfossiliferousJW]WHWIWJWKW^WCWDWEWFWGWHWfossilsBWGWWWtWuWvWwWxWyW{WWWWWXWYWfound{WLWMWNWOWfourWWWWfromAWBWFWIWLWOWPWZWoW{WAWBWDWLWMWNWOWYWZW[W\W_W`WaWbWcWdWeWfWgWhWiWjWkWlWpWqWrWsWtWuWvWwWxWyW{WWWW#WQWRWSWTWUWVWWWXWYWYWYWoneFWOWXWnWuWyWzWAWBWYWZW[W\WpWqWrWsW'W5WQWRWSWTWUWonlyNWEWFWW;W<W=WopcEW;W<W=WorDWGWHWJWLWSWVWWW]WsW{WHWIWJWKWLWMWNWOW^W_W`WaWbWcWdWeWWWWWW W!W8WCWDWEWFWGWHWKWLWMWNWOWPWSWTWUWZW[W[WordovicianbWEWUWVW;W<W=WoriginJW^Woriginal\WSWTWoriginallyFWWorthogneissEWPWQW{W|WLWMWNWOWWWXWotherNWQWUWuW5WothersJWSWWWbWsWUWVW^WWWotukRWoutIWoutcropsLWFW_W`WaWbWcWdWeWWouterCW|W}W~Wover{WLWMWNWOWoverlietW7WoverliesRWoverprintAWFWfWgWhWiWjWkWlWWoverprintedFWWoxides{WLWMWNWOWpackageAWfWgWhWiWjWkWlWpaleMW|WAWBWpalegray-greenmassivetogneissicgranitictodioriticort|VpaleozoicIWtW7W€*AkWeakly metamorphosed metasandstone, meta-argillite, phyllite, conglomerate, and rare marble exposed in two belts on the Wiseman/Chandalar quadangle boundary. This subunit, the southern of the two belts, is composed of phyllite, metasandstone with volcanic clasts, argillite, sandstone, pebble conglomerate and rare marble. This unit is part of the Central belt.kEConodonts, bryozoans, coralsGWI007H2055I Wiseman J MetamorphicK6927€+APzw_572BMetasedimentary rocksC PaleozoicAkWeakly metamorphosed metasandstone, meta-argillite, phyllite, conglomerate, and rare marble exposed in two belts on the Wiseman/Chandalar quadangle boundary. This subunit, the southern of the two belts, is composed of phyllite, metasandstone with volcanic clasts, argillite, sandstone, pebble conglomerate and rare marble. This unit is part of the Central belt.kEConodonts, bryozoans, coralsGCH004H2055I Chandalar J MetamorphicK6927@€,AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GAR004H2040I Ambler RiverJ SedimentaryK100N1000€-AQsB)Surficial sedimentary deposits, undividedC Quaternaryargillite, sandstone, pebble conglomerate and rare marble. This unit is part of the Central belt.kEConodonts, bryozoans, coralsGCH004H2055I Chandalar J Metamorphic€,AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GAR004H2040I Ambler RiverJ SedimentaryK100N1000€-AQsB)Surficial sedimentary deposits, undividedC QuaternaryntaryK100N1000€-AQsB)Surficial sedimentary deposits, undividedC Quaternary2040I Survey PassK100€$AjRelatively homogeneous assemblage dominated by light greenish-gray fine-grained quartz-rich schist, typically accompanied by minor layers of metaconglomerate, marble, and calcareous schist. Exposed in the southern Central belt in the western Survey Pass quadrangle and straddling the Wiseman/Chandalar quadrangle boundary. This unit is part of the Central belt.jEConodontGSP004H2021I Survey PassJ MetamorphicK8603€%APzZqsB!Quartz-rich metasedimentary rocksCPaleozoic to Proterozoic?AjRelatively homogeneous assemblage dominated by light greenish-gray fine-grained quartz-rich schist, typically accompanied by minor layers of metaconglomerate, marble, and calcareous schist. Exposed in the southern Central belt in the western Survey Pass quadrangle and straddling the Wiseman/Chandalar quadrangle boundary. This unit is part of the Central belt.jEConodontGWI007H2021IWisemanJ MetamorphicK8603€&APzZqsB!Quartz-rich metasedimentary rocksBcompositionHW{WLWMWNWOWWW W!WZW[WcompositionsHWWW W!WZW[Wconcretions\WSWTWconformablyRWconglomerateBWRWSWTWWWYW^WcWiWtWDWEWGWPWQWtWuWvWwWxWyW{WWWWWW*W+W7W9W:W;W<W=WWWXWYWconglomerateandfinergrainedsedimentaryrocksthatgradeBVtVuVvVwVxVyV{VWVXVYVconglomeraticCW|W}W~WconglomerteZWWWconodontsAWIWfWgWhWiWjWkWlWVWconsistsRWSW\WtWSWTW7WconsistsinascendingorderofdevonianmarinesedimentaryrSVconsistsofmetasandstoneandmetasiltstonewithsubordinate\VSVTVconstitutesLW_W`WaWbWcWdWeWcontactNWmWqW{WLWMWNWOW WWcontacts{WLWMWNWOWOWOWOWOWterraneAWDWEWvWwWyWzWWWXWfWgWhWiWjWkWlWmWnWoWW8WVWtexturesAWMWQWZW\WSWTWfWgWhWiWjWkWlWWWAWBWVWthanCW{WLWMWNWOW|W}W~WthatBWGWIWLWNWOWaWjWtWAWBWEWYWZW[W\W_W`WaWbWcWdWeWtWuWvWwWxWyW{WWW7W;W<W=WQWRWSWTWUWWWXWYWtheAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYW[W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|WW@WAWBWCWEWFWGWHWIWJWKWLWMWNWOWPWQWRWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWWW W W WWWWWWWWWWWWW€-DFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GSP004H2040I Survey PassJ SedimentaryK100N1000€.AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GWI007H2040IWisemanJ SedimentaryK100N1000)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GCH004H2040I Chandalar J SedimentaryK100N1000€0AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GCS004H2040I Christian J SedimentaryK100N1000€1AQsB)Surficial sedimentary deposits, undividedF€1K100N1000€2AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GSH005H2040I Shungnak J SedimentaryK100N1000€3AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GHU004H2040IHughes J SedimentaryK100N1000€4AQsB)Surficial sedimentary deposits, undividedC QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.GBT005H2040IBettles J SedimentaryK100N1000€5ASCvsBVolcanic and sedimentary rocksCSilurian to Cambrian=Microfossils, brachiopods, trilobites, graptolites, conodontsF2K-Ar and Ar-Ar ages of dikes 373-388 Ma and 478 MaGCH004H2057I Chandalar )€1GSE005H2040ISelawik J Sedimentary€1C QuaternaryDFrost-rived rubble on slopes and broad low ridges; glacially deposted sand, gravel, and boulders; fluvial gravel and sand; terrace deposits.% ABC DEFGH IJK L M N ABCDEFGHI J K L M N   !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxy{|}~  !#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]   H€6ASplB Black phyllite and metalimestoneCSilurianABlack siliceous phyllite and metalimestone, metasandstone, metasiltstone, phyllite, and graphitic calcareous schist in the eastern Ambler River and western Survey Pass quandrangles. This unit is part of the Central belt. Mapped as units Dbl and Db by Mayfield and Tailleur (1978)EwConodonts, graptolites, radiolarians; corals, gastropods, bryozoans, brachiopods, conularids, and orthocone cephalopodsGAR004H2049I Ambler River J MetamorphicK6686€7ATrCsBSedimentary rocksCTriassic to Carboniferousopods, conularids, and orthocone cephalopodsGAR004H2049I Ambler River J MetamorphicK6686€7ATrCsBSedimentary rocksCTriassic to Carboniferous Wolfcampian ageGWI006H2026IWiseman K5004€5A=Volcanic rocks, volcaniclastic rocks, and clastic sedimentary rocks exposed in the core of the Doonerak antiform, northeast Wiseman quadrangle. The unit can be divided into at least two lithologic sequences, one dominated by volcanic rocks, the other by sedimentary rocks. This unit is part of the Doonerak antiform.=E=Microfossils, brachiopods, trilobites, graptolites, conodontsF2K-Ar and Ar-Ar ages of dikes 373-388 Ma and 478 MaGCH004H2057I Chandalar J SedimentaryK6720Y[trcs47albite-richBWZWamberAWBWambersequenceAVBVamblerMWamblersequenceMVamountsGWCW]WamphiboliteAWfWgWhWiWjWkWlWVWandAWBWCWGWHWPWQWTWUWVW_W`WbWeWlWrWuWW@WCWDWRWUWVW]WfWgWhWiWjWkWlWtWuWvWwWxWyW{W|W}W~WWW WWWWWWW W!W5W6W>W?W@WIWJWKWLWMWNWOWPWSWTWUWVWWWXWYWZW[WangayuchamAWfWgWhWiWjWkWlWVWangayukaqsraqfWFWWWantiformbWUWVWVWVW€7EdConodonts; foraminifers; crinoidal packstone; burrows and trace fossils; brachiopods Wolfcampian ageGWI007H2026IWiseman J SedimentaryK5004€8AMzPzsB SerpentiniteCMesozoic? to Paleozoic?AGreenish-gray, yellowish-green, olive green or greenish black serpentinite, minor basaltic rocks, harzburgite tectonite, and nephrite jade exposed in the southern Ambler River and adjacent Shungnak quadrangles. In the Cosmos Hills fault-bounded serpentinite bodies sit above metasedimentary rocks of the Schist belt and below basalt of the Angayucham terrane (JDab) and Cretaceous metasedimentary rocks (Ks). In the Jade Mountains, in the southwestern Ambler River quadrangle, serpentinite is mBixed with subordinate basaltic rocks, dunite, peridotite, and nephrite jade, and occurs adjacent to a thick sequence of basalts of the Angayucham terrane (JDab). This unit is part of the Angayucham terrane.GAR004H2073I Ambler River J MetamorphicK3498€9AOPc€7AQuartzite, phyllite, siltstone, conglomerate, shale, sandstone, limestone, argillaceous limestone, dolomitic limestone, and cherty dolostone. Occurs in the Mount Doonerak area in northeastern Wiseman and northwestern Chandalar quadrangles, where it is interpreted to unconformably overlie lower Paleozoic rocks (map unit SCvs). Consists of Kekiktuk Conglomerate and Kayak Shale of the Endicott Group , Lisburne Group, Echooka Formation of Sadlerochit Group, and Shublik Formation and Karen CreBek Sandstone. Succession is similar to that of map unit JCs but differs in some details. This unit is part of the Doonerak antiform.rOnorthernHWZW]WiWyWzWGWHWIWJWKWmWnWoWWWWW W!WCWDWEWFWGWHWZW[Wnorthwest[WnorthwesternSWUWVWZWbWgWjWtWUWVWWWW WWW7WnorthwesternmostrWnotvWDWWWobviousCWDWEWFWGWHWoccurAWKWMW\WfWFWSWTWfWgWhWiWjWkWlWWW(W)WAWBWVW\W]W]W unit7W8W9W:W;W<W=W>W?W@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWVWWWXWYWZW[W\W]W\€:AOpCcB*Older carbonate rocks of the Central belt C!Middle Ordovician to Proterozoic?lostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite exposed in the northeastern Baird Mountains quadrangle, central Survey Pass quadrangle, and along the Dalton Highway in the Wiseman and Chandalar quadrangles. This unit is part of the Central belt.>EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGAR004H2015I Ambler River J Metamorphic€:AOpCcB*Older carbonate rocks of the Central belt C!Middle Ordovician to Proterozoic?Conodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGCH004H2015I Chandalar €=DDolostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite. Only exposures that contain the Ordovician part of unit OPc are included in this unit.EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGCH004H2042I Chandalar J MetamorphicK7741v€;EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGSP004H2042I Survey Pass J MetamorphicK7741€W?W@WIWJWKWLWMWNWOWPWQWRWSWTWUWmetalUWmetalimestoneAWFWIWJWNWTWXWYW]W^W`WaWbWcWhWjWEWHWIWJWKWPWQWUWVW^WfWgWhWiWjWkWlWpWqWrWsWWWWWWWWWWW6W9WqzbivalvesOWAWBWYWZW[W\WQWRWSWTWUWbrachiopodYWWWbrachiopodsAWIWJWSWTWVWYWZW\W]W^W`WcWgWhWkWsWtWuWDWEWHWIWJWKWPWQWSWTW^WfWgWhWiWjWkWlWWWWWWW WWWWWWWW5W6W7W9W:W;W<W=WCWDWEWFWGWHWVW€>ADmuB,Metasedimentary and lesser metaigneous rocksCMiddle and Late DevonianA#Heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. Includes significant expanses of rocks mapped as Beaucoup Formation by some workers. This unit is part of the Central belt.#thids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGCH004H2042I Chandalar J Metamorphic€>ADmuB,Metasedimentary and lesser metaigneous rocksCMiddle and Late DevonianA#Heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. Includes significant expanses of rocks mapped as Beaucoup Formation by some workers. This unit is part of the Central belt.#art of the Central belt.#t€:A>Dolostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite exposed in the northeastern Baird Mountains quadrangle, central Survey Pass quadrangle, and along the Dalton Highway in the Wiseman and Chandalar quadrangles. This unit is part of the Central belt.>EConodonts, stromatolites, protoconodonts, chancellorid sclerites, hyolithids, and steinkerns of monoplacophoran mollusks, acrotretid brachiopods,agnostid arthropods, graptolitesGCH004H2015I Chandalar J MetamorphicK7740€;AOpCc_541B5Older carbonate rocks of the Central belt, restrictedC!Middle Ordovician to Proterozoic?DDolostone, metalimestone, marble and subordinate quartzose metasedimentary rocks, carbonate conglomerate, and metabasite. Only exposures that contain the Ordovician part of unit OPc are included in this unit.€>E=Megafossils and conodonts are Middle and early Late Devonian FoU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocks GWI007H2017IWisemanJ MetamorphicK6927€?ADmu_542BNMetasedimentary and lesser metaigneous rocks, calcareous, iron-rich componentsCMiddle and Late DevonianAhPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. This part of the unit contains a light brown, gray, and orange-weathering ferruginous and calcareous mica schist, phyllite, and metasiltstone. This unit is part of the Central belt.hE=Megafossils and conodonts are Middle and early Late Devonian FoU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocks GSP004H2052I Survey PassJ MetamorphicK6972€@ADmu_542%€AADaBAmber sequenceCDevonianaigneous rocks, calcareous, iron-rich componentsCMiddle and Late DevonianAhPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. This part of the unit contains a light brown, gray, and orange-weathering ferruginous and calcareous mica schist, phyllite, and metasiltstone. This unit is part of the Central belt.hEW?W@WCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWlensesHWKWLWMWXWjWqW_W`WaWbWcWdWeWWWWWW W!W(W)WAWBWSWTWUWZW[W\W]WlessLWSWhW{WLWMWNWOW_W`WaWbWcWdWeWWWWWWWCWDWEWFWGWHWlesserGW]W^W_WbWW@WCWHWIWJWKWPWQWRWUWVW]W>W?W@W@W&*RBNMetasedimentary and lesser metaigneous rocks, calcareous, iron-rich componentsCMiddle and Late DevonianAhPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. This part of the unit contains a light brown, gray, and orange-weathering ferruginous and calcareous mica schist, phyllite, and metasiltstone. This unit is part of the Central belt.hE=Megafossils and conodonts are Middle and early Late Devonian FnU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocksGAR004H2052I Ambler RiverJ MetamorphicK6972€EADhf_101B$Hunt Fork Shale - foliated exposuresC Late DevonianA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `hinoderms; Middle to Late Devonian conodonts; GWI006H2044IWisemanJ MetamorphicK7225€EADhf_101B$Hunt Fork Shale - foliated exposuresC Late DevonianA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `! andDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]WorangePWbWdWUWVWWorange-weatheringOWaWgWAWBWRWYWZW[W\W W?W@WQWRWSWTWUWorderSWordovicianbWEWUWVW;W<W=WoriginJW^Woriginal\WSWTWoriginally`WFWWorthogneissEWPWQW{W|WLWMWNWOWWWXWotherNWQWUWuW5WothersJWSWWWbWsWUWVW^WWWotukRWoutIWoutcropsLWFW_W`WaWbWcWdWeWWouterCW|W}W~Wover{WLWMWNWOWoverlietW7WoverliesRWoverprintAWFWfWgWhWiWjWkWlWWVWoverprintedFWWoxides{WLWMWNWOWpackageAWfWgWhWiWjWkWlWVWpaleMW|WAWBWpalegray-greenmassivetogneissicgranitictodioriticort|VpaleozoicIWtW7WbrachiopodsIWbreadthHWWW W!WZW[WbrecciaAWMWfWgWhWiWjWkWlWAWBWVWbroad~W,W-W.W/W0W1W2W3W4WbrokenoW#WbrooksyWbrosgWWWWbrosgeyWzWbrownGWMWOWkWoWAWBWCWRWYWZW[W\W]WW#W?W@WAWBWQWRWSWTWUWbrown-weatheringHWWW W!WZW[W[W[WBsedimentsAWfWgWhWiWjWkWlWVWsegregationmW WsemipeliticLW_W`WaWbWcWdWeWsemischistoseZW\WSWTWWWseparatelySWsequenceDWJWSWrWsW^W8WsequencesuW5Wsericite{WLWMWNWOWserpentiniteDWFWpWqWrWsW8WseveralSWTWaW}W W WSWTWUWsewardbWUWVWshaleGWRWSWYW[WtWCW]WWW7W.-TJ MetamorphicK6900UADOcBfYounger carbonate rocks of the Nanielik Antiform, Central belt and part of Northern Thrust AssemblagesCMiddle Devonian to OrdovicianAVery light- to dark-gray- (locally orange-) weathering, gray to black, commonly massive dolostone and lesser metalimestone and marble exposed in the northeastern Baird Mountains quadrangle in the Nanielik antiform and in the northwestern Chandalar quadrangle. Unit has similarities in lithofacies and biofacies to younger part of DOb, as well as coeval strata of the York Mountains on Seward Peninsula. Ordovician biotas include some megafossils and microfossils with Siberian affinities and oBthers with Laurentian affinities; Silurian and younger fossil assemblages are chiefly cosmopolitan. This unit is part of the Central belt.xE"Conodonts, corals, stromatoporoidsGAR004H2016I Ambler River J MetamorphicK6980VADOc€GA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `EjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GBM004H2044IBaird MountainsJ MetamorphicK7225€HADhf_101B$Hunt Fork Shale - foliated exposuresC Late DevonianA`Dark gray to black phyllite and lesser gray-green phyllite with thin layers of siliceous or calcareous metasiltstone, lithic wacke, metasandstone, and minor layers of fossiliferous metalimestone exposed along the length of the northern boundary of the map. This part of the unit is more strongly foliated and sedimentary structures are less obvious. `!areaAWFWGWUWVWZWhWkWnWrWtWwWCW]WfWgWhWiWjWkWlWpWqWrWsWWWWWWWWWWW'W7WVWareasEWMWZWjWFWWWXWWWWWWAWBWargillaceousRWaWsWtW7WargilliteiWGW*W+WaroundfWWarrigetchPWarrigetch-igikpakQWasJWLWMWSW_W`WbWfWyWzWW@WUWVW^W_W`WaWbWcWdWeWW6W>WAWBWIWJWSWTWUWascendingSW€IADmuB,Metasedimentary and lesser metaigneous rocksCMiddle and Late DevonianA#Heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt. Includes significant expanses of rocks mapped as Beaucoup Formation by some workers. This unit is part of the Central belt.#E€KADmu_541BKMetasedimentary and lesser metaigneous rocks, volcanic-rock bearing subunitCMiddle and Late DevonianAPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt, thought to be correlative with the Beaucoup Formation. This subunit contains felsic to intermediate volcanic rocks or sedimentary rocks with abundant volcanic clasts. This unit is part of the Central belt.E=Megafossils and conodonts are Middle and early Late Devonian FJU-Pb zircon crystallization age of 393+/-2 Ma from a foliated felsic rock GBM004H2043IBaird MountainsJ MetamorphicK6973€LADmu_541BKMetasedimentary and lesser metaigneous rocks, volcanic-rock bearing subunitCMiddle and Late DevoniansubunitCMiddle and Late Devonianarly Late Devonian FJU-Pb zircon crystallization age of 393+/-2 Ma from a foliated felsic rock GAR004H2043I Ambler River€JE=Megafossils and conodonts are Middle and early Late Devonian FoU-Pb zircon crystallization age of 393+/-2 Ma from subunit that contains felsic to intermediate volcanic rocks GCS004H2017I Christian J MetamorphicK69270AjRelatively homogeneous assemblage dominated by light greenish-gray fine-grained quartz-rich schist, typically accompanied by minor layers of metaconglomerate, marble, and calcareous schist. Exposed in the southern Central belt in the western Survey Pass quadrangle and straddling the Wiseman/Chandalar quadrangle boundary. This unit is part of the Central belt.jEConodontGAR004H2021I Ambler RiverJ MetamorphicK8603€OAPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt, thought to be correlative with the Beaucoup Formation. This subunit contains felsic to intermediate volcanic rocks or sedimentary rocks with abundant volcanic clasts. This unit is part of the Central belt.E=Megafossils and conodonts are Middle and early Late Devonian FJU-Pb zircon crystallization age of 393+/-2 Ma from a foliated felsic rock GCH004H2043I ChandalarJ MetamorphicK6973€PADmu_541BKMetasedimentary and lesser metaigneous rocks, volcanic-rock bearing subunitCMiddle and Late Devonian€NAPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt, thought to be correlative with the Beaucoup Formation. This subunit contains felsic to intermediate volcanic rocks or sedimentary rocks with abundant volcanic clasts. This unit is part of the Central belt.E@E€@B€A@AE€BBE€DA€E@E€GA€HE€I@€JE€K@€LA€MA€NA€OA€PA€Q@A5€RA€SA€T@A€UA€VAj€VAjLcalcite{WLWMWNWOWcanuW5WcarbonaceousMWUWlW WAWBWcarbonateIWNWcWEW9W:W;W<W=Wcarbonate-andBWZWcarbonate-richOWAWBWYWZW[W\WQWRWSWTWUWcarboniferousSWcaroyWzWcentimeterLW_W`WaWbWcWdWeWcentralFWNWPWWW^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqW{WW@WFWGWLWMWNWOWPWQWRWUWVWpWqWrWsWWWWW W W WWWWWWWWWWWWWWWW#W$W%W&W'W*W+W6W9W:W>W?W@WIWJWKWLWMWNWOWPW8a3Ä1SE;<=Ä1TKLMNOPÄ1UCDEFGHÄ1VÄ1W%Ä1X.'Ä1YÄ1Z 6Ä1cR?@Ä1dGÄ1f)*+Ä1gSTÄ1h55Ä1rÄ1sÄ1tBZÄ1v- Ä1w, Ä1x<Ä1yFÄ1z!Ä13Ä1Ä18Ä1Ä1Ä12Ä1Ä1C]Ä1 ^Ä1' Ä1 Ä1Ä1Ä1DÄ1Ä1|}~Ä1pqrs amblerAWIWJWMWNWTWWWYWmWnWpW{WWHWRWSWUWYWZW_WpWtWWWW WWWWW(W,W6W8W9WFWLWW>BALight gray, brown and locally orange-weathering, lithologically heterogeneous mix of marble and carbonate-rich, quartz-rich, and mafic schist derived from metasedimentary and metaigneous protoliths, one of two major units that extends along the length of the Schist belt. These exposures in the western part of the schist belt, in the Akiak antiform, are rich in carbonate-and albite-rich rocksEbGhosts of radiolarians, sponge spicules, bivalves, fine graphite laminae, stromatolites, conodontsGBM004H2063IBaird Mountains J MetamorphicK8607j;€WAKsB"Conglomerate, sandstone, and shaleC Cretaceousa, basaltic tuff, diabase, microgabbro, radiolarian and tuffaceous chert, minor metalimestone, and rare mafic schist in an imbricate package exposed along the southern boundary of the map area. Commonly, metamorphic minerals partially overprint primary igneous and sedimentary textures in the metabasalts and metagabbros, but some foliated and lineated metabasalts occur in the western Ambler River quadrangle. Devonian, Mississippian, Triassic, Band Jurassic radiolarians, conodonts, and megafossils have been collected from chert, cherty tuff, metalimestone layers, interpillow sediments, and fault slivers. This unit is part of the Angayucham terrane.EJRadiolarians, conodonts, megafossils, foraminifers, bryozoans, brachiopodsGSH002H2009IShungnakJ MetamorphicK5133€WAKsB"Conglomerate, sandstone, and shaleC CretaceousH!metasiltstone\W]W^W`WoWHWIWJWKWPWQWRWSWTW#W6W?W@WCWDWEWFWGWHWmetatuffSWTWUWmeterFWLW_W`WaWbWcWdWeWpWqWrWsWmetersGWLWMWOWxWAWYW[W\W_W`WaWbWcWdWeWAWBWQWRWmetagabbroFWHWfWoWFWpWqWrWsWWWWW W!W#WZW[WmetagabbrosAWFWfWgWhWiWjWkWlWpWqWrWsWVWmetagranitefWFWWWmetagranitic{W}WLWMWNWOW W Wmetagraniticrocksofseveralproterozoicagesexposedinso}V V VmetagraywackeBWFWpWqWrWsWtWuWvWwWxWyW{WWWXWYWmetagraywacke-richHWWW W!WZW[WmetaigneousOW_WW@WAWBWRWYWZW[W\W>W?W@WIWJWKWLWMWNWOWPWQWRWSWTWUWmetalUWmetalimestoneAWFWIWJWNWTWXWYW]W^W`WaWbWcWhWjWEWHWIWJWKWPWQWUWVW^WfWgWhWiWjWkWlWpWqWrWsWWWWWWWWWWW6W9W9W9W9W7jradiolariansconodontsFVpVqVrVsVradiolariansconodontsmegafossilsforaminifersbryozoansbrAVfVgVhViVjVkVlVVVrugoseJW^WscleritescWEW9W:W;W<W=WsilicifiedhWWWWWWWsolitary^WPWQWsome\WSWTWsparseBWtWuWvWwWxWyW{WWWXWYWsparseplantfossilsofearlytolatecretaceousageearlycBVtVuVvVwVxVyV{VWVXVYVspiculesOWRWVWAWBWYWZW[W\WWQWRWSWTWUWspiculiticsWspinesNWspongeOWRWVWAWBWYWZW[W\WWQWRWSWTWUWUWUW€WAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GSH005H2038IShungnakJ SedimentaryK1990€XAKsB"Conglomerate, sandstone, and shaleC CretaceousdO€W@A€XA€YA#€Z@A€[AwandAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWmWnWoWpWqWrWsWtWuWvWwWyWzW{W}W~WW@WAWBWCWDWEWFWGWHWIWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyW{W|W}W~WWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWWW W!W#W$W%W&W'W(W)W*W+W,W-W.W/W0W1W2W3W4W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWCWCWZrockBWEWNWWWXWtWuWvWwWxWyW{WSWTWUWWWXWYWrocksBWCWDWEWIWKWNWQWSWWW_WaWcWeWtWuWvWzW}WW@WBWEWFWRWWWXWZWtWuWvWwWxWyW{W|W}W~WWWW W WWWWWW(W)W5W7W8W9W:W;W<W=W>W?W@WIWJWKWLWMWNWOWPWWWXWYW\W]Wrubble~W,W-W.W/W0W1W2W3W4WrubyJWvWwWyWzW^WmWnWoWWsadlerochittW7Wsand~W,W-W.W/W0W1W2W3W4WsandstoneHWRWSWVW[WsWtWDWWWWW W!W*W+W7WZW[WsandstoneshaleargillaceouslimestonelimestonedolostonemRVsandysWscaleKWSW(W)WSWTWUW\W]WscalesLWOWAWYW[W\W_W`WaWbWcWdWeWQWRWRWRWRWaconglomeratesandstoneandshaleBVtVuVvVwVxVyV{VWVXVYVcosmosJW^WcreekSWdeposits~W,W-W.W/W0W1W2W3W4WelisWeliriversequencesVendicottTWVW[WWendicottgroupundivided[VerniedWWexposuresCWDWEWFWGWHWfoliatedCWDWEWFWGWHWfork]WHWIWJWKWCWDWEWFWGWHWgraniticyW{W|W}WLWMWNWOWmWnWoW W Wgraniticorthogneiss{V}VLVMVNVOV V VgraniticrocksyV|VmVnVoVgraywackeCWHW|W}W~WWW W!WZW[W[W[Wc ~xAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EYSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GSE005H2038ISelawikJ SedimentaryK1990yAKsB"Conglomerate, sandstone, and shaleC Cretaceous€[ADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thoseB in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GHU004H2007IHughes J MetamorphicK5565  ADpCsc age-diagnosticWWWW^€]APzsgB Mafic schistC PaleozoicDGreen and greenish-gray schistose to massive irregularly-shaped bodies and lenses of mafic rocks in units Dsq and DPsc large enough to show at the scale of the map occur in the Survey Pass and Chandalar quadrangles. This unit is part of the Schist belt.GBM004H2006IBaird MountainsJ MetamorphicK7000greenish-gray schistose to massive irregularly-shaped bodies and lenses of mafic rocks in units Dsq and DPsc large enough to show at the scale of the map occur in the Survey Pass and Chandalar quadrangles. This unit is part of the Schist belt.GBM004H2006IBaird MountainsJ MetamorphicK70007€\DGreen and greenish-gray schistose to massive irregularly-shaped bodies and lenses of mafic rocks in units Dsq and DPsc large enough to show at the scale of the map occur in the Survey Pass and Chandalar quadrangles. This unit is part of the Schist belt.GSE005H2006ISelawikJ MetamorphicK7000 duniteDW8WearliestwWearlyBWGWIWtWuWvWwWxWyW{WWWXWYWeastGWeast-centralTWeasternGW`WdWkWoWCW]WWW#W6WechookatW7WelevatedUWelisWelongateNWelsewhereSWSWitMWtW7WAWBWjadeDWIW8WjcstW7WjdabDW8WjurassicAWSWfWgWhWiWjWkWlWVWk-feldspar{WLWMWNWOWkanayutRWDWWkarentW7WkarlSWsWhpE{AConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GBT005H2038IBettlesJ SedimentaryK1990€HEjBrachiopods (late Frasnian to early Fammenian), mollusks, echinoderms; Middle to Late Devonian conodonts; GCS004H2044I Christian J MetamorphicK7225 @ ?@@EBAC@D@F@AGAH@AEJA ELAM@$A#NAO@%F&RBS@*A.TJVB-WA/X@A1YE3[@4A6\@ A0^A9_@<`A@F?bb?b?b?bbF?b  AFault-bounded blocks of marble, metalimestone, and dolostone that crop out in southwestern Ambler River quadrangle. Carbonate rocks are locally intercalated with black phyllite, black metaquartzite, and metachert, contain megafossils (corals, brachiopods, crinoid debris), and yield conodonts that indicate a range of middle Paleozoic ages; most precise ages are Late Silurian-early Early Devonian, Middle Devonian (Givetian), and Early Mississippian. Corals of Devonian and possible Silurian BRage are reported from the Jade Mountains. This unit is part of the Phyllite belt.@E.Corals, brachiopods, crinoid debris, conodontsGAR004H2086I Ambler RiverJ MetamorphicK5570 ADScBCarbonate rocks of Cosmos HillsCDevonian and SilurianUW#mAKgBGranitic rocks C CretaceousDGranite, quartz monzonite, and granodiorite of the northern Ruby terrane, exposed along the southern boundary of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGCH004H2037I ChandalarJIgneousK2492nAKgBGranitic rocks C CretaceousDGranite, quartz monzonite, and granodiorite of the northern Ruby terrane, exposed along the southern boundary of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGCS004H2037I Christian JIgneousK2492y of the Chandalar quadrangle.F/K-Ar dates from south of map area are 96-112 MaGCS004H2037I Christian JIgneousK24925FAAmphibolite, metaquartzite, calcareous schist, metapelite, and a few small bodies of metagranite and metagabbro, originally metamorphosed at amphibolite-facies rocks and overprinted by an albite epidote amphibolite facies event. Mafic outcrops in these areas are massive dark blue to dark-bluish-green with small knots of olive-colored epidote after garnet. Dolostone and marble occur along shear zones within the albite-epidote amphibolite facies rocks. The albite-epidote amphibolite facieBys rocks experienced a blueschist facies overprint detectable only in thin section. This unit is part of the Central belt.gFQ40Ar/39Ar - 680 Ma metamorphic age, overprinting event - 40Ar/39Ar age of 120 MaGBM004H2068IBaird Mountains J MetamorphicK9300GAPzwBMetasedimentary rocksC Paleozoic$LATan to gray weathering, equigranular to porphyroblastic, fine to coarse grained metagranitic bodies ranging in size from less than a kilometer to over 20 kms across, found in both the Schist and Central belts. Generally granitic in composition and made up of quartz, K-feldspar, albite, muscovite, and biotite. In the Chandalar quadrangle, the Horace Mountain pluton is dioritic to granodioritic in composition, and contains hornblende. Chlorite, sericite, Fe-Ti oxides, epidote minerals, andB calcite are also present in many of the plutons. Remnants of intrusive contact relations are locally preserved. Exposures of skarn have been mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). FXU-Pb zircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GSH005H2003IShungnakJ MetamorphicK7250 ;ATan to gray weathering, equigranular to porphyroblastic, fine to coarse grained metagranitic bodies ranging in size from less than a kilometer to over 20 kms across, found in both the Schist and Central belts. Generally granitic in composition and made up of quartz, K-feldspar, albite, muscovite, and biotite. In the Chandalar quadrangle, the Horace Mountain pluton is dioritic to granodioritic in composition, and contains hornblende. Chlorite, sericite, Fe-Ti oxides, epidote minerals, andB calcite are also present in many of the plutons. Remnants of intrusive contact relations are locally preserved. Exposures of skarn have been mapped at the contacts and within the orthogneiss bodies. Skarns at the contacts of some of the plutons are mineralized (Sn or Cu). FXU-Pb zircon dates for orthogneiss 390-396 Ma; 375-395 Ma for orthogneiss at Mt. Igikpak GAR004H2003I Ambler RiverJ MetamorphicK7250  Ug1?  }C '  '  '   ' E  E'   '   '   '    ' p    p' Dv   ' 3    3' ~   @€MAPart of heterogeneous expanses of calcareous, siliceous, and volcaniclastic metasedimentary rocks, with lesser metaigneous rocks, exposed along the length of the Central belt, thought to be correlative with the Beaucoup Formation. This subunit contains felsic to intermediate volcanic rocks or sedimentary rocks with abundant volcanic clasts. This unit is part of the Central belt.E=Megafossils and conodonts are Middle and early Late Devonian FJU-Pb zircon crystallization age of 393+/-2 Ma from a foliated felsic rock GSP004H2043I Survey PassJ MetamorphicK6973€NADmu_541BKMetasedimentary and lesser metaigneous rocks, volcanic-rock bearing subunitCMiddle and Late Devonian!€DQuartz-albite-oligoclase-biotite schist with staurolite and andalusite exposed in the southeastern Chandalar quadrangle, adjacent to rocks of the Schist belt. Age of metamorphism not known. This unit is part of the Ruby terrane.GCS004H2034I Christian J MetamorphicK8601ADark gray to black phyllite and brown-weathering greywacke, sandstone, and mudstone exposed along the southern boundary of the schist belt. The unit varies in breadth along strike. In the Wiseman and Chandalar quadrangles, two subunits are recognized: a northern dark, fine-grained phyllite or phyllonite, and a southern metagraywacke-rich unit. The northern unit is lithologically homogeneous, well foliated, and locally contains small bodies of mafic schist similar in composition to thoseB in the underlying Schist belt. Greenschist-facies metagabbro plugs in the southern subunit also have compositions similar to mafic lenses in the Schist belt. This unit is part of the Phyllite belt.GBM004H2007IBaird Mountains J MetamorphicK5565€DWhite to gray (less commonly black), fine to coarsely crystalline, massive to platy marble and subordinate metalimestone and dolostone occurs discontinuously in all quadrangles within the map area. This unit is part of the Central belt.EConodonts, silicified two-hole crinoid columnals of late Early-early Middle Devonian (late Emsian-Eifelian) age; brachiopods; possible stromatoporoids; pelmatozoan; trilobitesGCS004H2023I ChristianJ MetamorphicK6983po|AFine grained to conglomeratic greywacke and fine-grained laminated mudstone exposed along the south-central boundary of the map. Mudstone is locally tuffaceous. Clasts are predominantly intermediate and mafic volcanic and intrusive rocks and chert with subordinate amounts of quartz, metamorphic, and granitic clasts. Metamorphic detritus increases in abundance in the upper part of the unit. Graywacke is more common than mudstone; the unit is thought to represent middle and outer submarineB< fan deposits. This unit is part of the Yukon-Koyukuk basin.*E5Marine mollusks of Late Early Cretaceous (Albian) ageGSH005H2091I Shungnak J SedimentaryK2180F€YAConglomerate and finer grained sedimentary rocks that grade from massive, poorly stratified rocks rich in mafic intrusive and extrusive clasts at the base of the unit to a well-sorted sedimentary rock rich in quartz and metagraywacke clasts at the top of the unit. Contains sparse plant fossils that range in age from late Early Cretaceous to Late Cretaceous. In the northeastern Shungnak and parts of Ambler and Hughes quadrangles, the unit is regionally metamorphosed to low metamorphic gradBes (prehnite-pumpellyite to low greenschist-facies) and deformed; rocks are strongly foliated and clasts have flattening ratios of 10:1. This unit is part of the Yukon-Koyukuk basin.EXSparse plant fossils of Early to Late Cretaceous age; Early Cretaceous? marine mollusks GBT005H2038IBettlesJ SedimentaryK1990&#shungnak surveypasswisemanÃ!,Ä*tÄE8ÄbDÄbVpÄf6 ÄfqÄfvÄf ÄtÄtqÄtvÄw6ÄzSÄz&Äz6HÄz8?ÄzRÄzLÄzUÄzÄ(Ä&Ä6FÄF Äa;Äq ÄQ9Ä-_Ä0ÄYÄZÄfÄbVÄfq*ÄfvÄsÄtÄt1Ät9ÄzÄz&Äz6Äz8ÄzbÄz!"Äz3Äz(ÄF,ÄQ#ÄREÄ ÄAÄBÄf%ÄV<Äq=Ä&FbairdmountainsÄ*vÄ2Ä59ÄaÄbDgÄtB ÄtqÄtvÄx15Äya+Äz%Äz6JÄz8)ÄzÄaNÄaÄÄ[Ä"$ÄcÄq  wisemanÄ*yÄ2|ÄEÄbDjÄbVrÄz8^ÄaLÄe shungnakÄ5nÄbDiÄzÄzbPÄzÄ]ÄÄc  christianÄ*uÄbDfÄbVqÄt9ÄtB'ÄtqÄtvÄw ÄzTÄz%DÄz&Äz6IÄz8@ÄzÄ ÄaOÄqÄrÄ`Ä1ÄÄq  surveypassÃF8Ä*w'Ä5mÄ7!:Ä7a/Äa4ÄbDhÄfqÄfv!Äx15ÄyaÄz6KÄz8G+IÄzbQÄzOÄzVÄzÄ)ÄCÄ6CÄaMÄQ:ÄR=Ä6ÄbÄ&Ä\ÄUÄcWÄ67  chandalar Ã!4Ä*{YÄ2~Ä5oÄbDlÄcX bettles Ã!1Ä*xÄzÄ\ÄdÄQÄf selawik Ã!3Ä*XÄ2}ÄbDkÄbVsÄfv[ hughes  @7RA @7RA$'Är.Ä amblerriverÃ!>Ä*ÄZb2ÄaÄbVÄfq*ÄfvÄsÄtÄt1Ät9ÄzÄz&Äz6Äz8ÄzbÄzK!"Äz3Äz(Ä6GÄF,ÄQ#ÄREÄ ÄAÄBÄf%ÄV<Äq=Ä&FbairdmountainsÃ!.Ä*vÄ2Ä59Ä7a#ÄaÄa7ÄbDgÄfv ÄtB ÄtqÄtvÄx15Äya+Äz%Äz6JÄz8)*>Äz@ÄzÄ6DÄaNÄqBÄR<ÄaÄ%ÄÄ[Ä"$ÄfÄcÄq  wisemanÃ!2Ä*yÄ2|ÄEÄbDjÄbVrÄz8^ÄaLÄe shungnakÃ!0Ä5nÄbDiÄzÄz8JÄzbPÄzÄ]Ä6HÄÄc  christianÃ!-Ä*uÄbDfÄbVqÄfvÄt9ÄtB'ÄtqÄtvÄw ÄzTÄz%DÄz&Äz6IÄz8@Äz?ÄzÄ Ä6EÄaOÄqAÄqÄrÄR;Ä`Ä$Ä1ÄÄ"ÄfÄr'Äq  surveypassÃ!/ÃF8Ä*w&%Äz!"Äz3Äz(Ä]Ä6GÄF,ÄQ#ÄREÄ ÄAÄBÄf%ÄV<Äq=Ä&FbairdmountainsÃ!.Ä*vÄ2Ä59Ä7a#ÄaÄa7ÄbDgÄfv ÄtB ÄtqÄtvÄx15Äya+Äz%Äz6JÄz8)*>Äz@ÄzNÄzÄ6DÄaNÄqBÄR<ÄaÄ%ÄÄ[ÄTÄ"$ÄfÄcÄq  wisemanÃ!2Ä*yWÄ2|ÄEÄbDjVÄbVrÄz8^ÄaLÄeÄR shungnakÃ!0Ä5nÄbDiÄzÄz8JÄzbPÄzPÄzÄ]Ä6HÄÄc  christianÃ!-Ä*uÄbDfÄbVqÄfvZÄt9ÄtB'ÄtqÄtvÄw ÄzTÄz%DÄz&Äz6IÄz8@Äz?ÄzMÄzÄ Ä6EÄaOÄqAÄqÄrÄR;Ä`Ä$Ä1ÄÄSÄ"ÄfÄr'Äq  surveypassÃ!/ÃF8Ä*w