work makAll play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All HBAM2016AUG95HPro 5.0 All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a goodCopyright 1984-1997 Claris Corporation and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. All play and no work makes John a good boy. cbundtzen@contains@display@(fork-upper@granite@least@4mapping@|pillow@siltstone@subunit@usually@f@intermediate@related@Bundivided@Hpattonwwjrwilsonfhlabaykaandshewnorainpreprec@6@k@d€'@X€6@Y€E@T€@&€@AaNNNN@€E€CAaNN@€E€CAaN€@€E€CNBFACGADCEHBFDGIBHDIJBJDKLALOAMCNQAORAPCQSARTASCTVEUXAVYAWZAX[BY]AZ^E[_B\`A]aA^bA_cB`dBae @0 ANAME@SPAT@AA!HBAM3016AUG95@L‚Ã!Ã!`Ã!Ã!Ã"Ã" Ã"pÃ"Ã#Ã#`Ã$`IÃ*Ã9`ÃAÃA`ÃFÃu Ä!Ä!Ä!Ä!"Ä!#Ä"Ä"1Ä$1,Ä&!/Ä'0Ä'3Ä'Ä'Ä'6Ä'8Ä'1Ä'A9Ä'RJÄ'aÄ'f;Ä'q<Ä'HÄ)&Ä)1Ä)2Ä)3Ä)4Ä* Ä*KÄ*Ä*Q Ä*RUÄ*SLÄ* Ä*RÄ*SÄ*VÄ11Ä12 Ä14Ä1AWÄ2\Ä2`Ä2Ä2&_Ä26aÄ2c]Ä2Ä2XÄ2YÄ2dd2dd2dd2dddd2dddd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2dd2ddd2ddoÄ5vÄ5!wÄ5"xÄ51~Ä5QÄ5VÄ5arÄ5qsÄ5vtÄ5uÄ5yÄ6!Ä61zÄ66{Ä6A|Ä6Q}Ä6Ä7Ä7Ä7Ä8Ä8Ä81Ä9! Ä9# Ä9&Ä9'Ä9(Ä92Ä9a Ä9b Ä9c Ä9qÄ9kÄ:Ä:1%Ä:V&WW/@AGE DESCRIPTIONLABELNAMEDAnsaclassB GA description@@?A Layout #1A Layout #1B$$$$ @BBB@ A  BUUX $,.YesNo/,  , : AM PM@Arial MS Sans Serif !jX5{iD  jD{wHEkD {0SunMonTueWedThuFriSatJanFebMarAprMayJunJulAugSepOctNovDec4m:v_A x 9/22/2005 E Pro 3.0 - 4.0F!  2(H Pro 5.0 - 5.5M1,,./: AM PM AMYyTtNnFfNALL ODBF P^SundayMondayTuesday WednesdayThursdayFridaySaturdayJanuaryFebruaryMarchAprilMayJuneJulyAugust SeptemberOctoberNovemberDecemberQ1Q2Q3Q4 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter,  , NSACLASSSOURCESDAnsaclassB GA descriptionB GAlabelB GAageB GAnameB GAsourcesB G $,.YesNo/,  , : AM PM@Arial MS Sans Serif ! `@@@A Layout #1A Layout #1B$$$$@A $,.YesNo/,  , : AM PMB  C $,.YesNo/,  , : AM PMD  E $,.YesNo/,  , : AM PMF  G $,.YesNo/,  , : AM PMH  I $,.YesNo/,  , : AM PMGBnsaclassDlabelFnameHageJ descriptionLsources A A @BBA B *           A99A#Areas that air photo interpretation suggest as being underlain by bedrock. Typically are of higher elevation than surrounding glacial deposits and show hints of structure. Also includes rubble of metasiltstone and chert in the Kantishna River quadrangle and other areas of unknown bedrock #CbuEBedrock of unknown type or age correlative with the Tertiary coal-bearing sequence (unit Tcb). In the Mount Hayes quadrangle, units Ts and Tsc of (Nokleberg and others, 1992a), consist J  K $,.YesNo/,  , : AM PML  MN $,.YesNo/,  , : AM PMO $,.YesNo/,  , : AM PMP $,.YesNo/,  , : AM PMQR $,.YesNo/,  , : AM PM@A2170‚Ã!Ã!`Ã!Ã!Ã"Ã" Ã"pÃ"Ã#Ã#`Ã$`IÃ*Ã9`ÃAÃA`ÃFÃu Ä!Ä!Ä!Ä!"Ä!#Ä"Ä"1Ä$1,Ä&!/Ä'0Ä'3Ä'Ä'Ä'6Ä'8Ä'1Ä'A9Ä'RJÄ'aÄ'f;Ä'q<Ä'HÄ)&Ä)1Ä)2Ä)3Ä)4Ä* Ä*KÄ*Ä*Q Ä*RUÄ*SLÄ* Ä*RÄ*SÄ*VÄ11Ä12 Ä14Ä1AWÄ2\Ä2`Ä2Ä4AoÄ4FvÄ5!wÄ51~Ä5QÄ5qsÄ5uÄ6!Ä9# Ä9&Ä9'Ä9(ÄD'ÄE[ÄIbbÄQC6ÄTQEÄYDÄa#vÄa1YÄa2cÄb#eÄb$^Äb1zÄbAXÄbB`ÄbCWÄbDZÄbQVÄcAÄcÄcÄd!ÄdQÄe!Äf6ÄfS_ÄfqÄfvÄg&ÄhQÄqfÄv3ÄvAÄw1ÄwÄz!ÄzgÄzqÄzwÄrÄaÄ1ÄÄ!Ä!Ä"ÄÄ!ÄÄ!ÄQÄÄ!ÄeA@Unit comprises numerous alkali basalt, basanite, and hawaiite cones, short flows, and maar craters. Cones and flows have little or no vegetative cover and still preserve some primary flow structures. Locally contains peridotite and pyroxenite xenoliths. Unit was erupted through and stratigraphically overlies unit QTb@CQabD PleistoceneEAlkalic basalt cones and flowsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A305BBlack glassy olivine tholeiitic basalt flows erupted from two small craters. Flows exhibit well-developed pahoehoe crusts and lack vegetative cover. One K/Ar isotopic determination from this unit gave a cooling age of 0.19 Ma CQtbDHolocene? and Pleistocene for]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWW Dudes the Wrangell Lava consisting chiefly of basalt and andesite in the southeastern part of the map area and olivine basalt and vesicular andesite in the northern part of the map area (Nokleberg and others, in press) :}_scientificWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWpWWWWW#W$W%W*W/W3W4W5W6W8W9WseriesCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGW RA100BChiefly silt and very fine sand including thick deposits of micaeous silt in the Koyukuk Flats and Nowitna and Innoko Lowlands. Local deposits of alluvial fan and glacial outwash gravelsCQuaD QuaternaryE$Surficial deposits, undifferentiatedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A300D QuaternaryE$Surficial deposits, undifferentiatedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A3000A300e APoorly consolidated nonmarine deposits occur in five areas listed below; the first three are located close to the Kaltag Fault. Pollen samples from these five areas range in age from Oligocene to Pliocene.: 1) Unalakleet quadrangle. Clay shale, lignite, and volcanic ash exposed on Norton Sound coast.; 2) Norton Bay quadrangle. Small body of coaly mudstone, lignite, poorly consolidated quartz gravel and sandstone exposed on north side of Unalakleet River valley; 3) Melozitna and TanBana quadrangles. Sandstone, claystone, conglomerate, and lignite exposed on south bank of Yukon River near the border of the Melozitna and Tanana quadrangles and small outcrops on the north side of the Yukon River in the Tanana quadrangle; 4) Tanana quadrangle. Sandstone, shale, coal, and lignite exposed on the Tozitna River and its tributaries in central part of Tanana quadrangle; 5) Selawik quadrangle. Tiny body of gravel and sand along an E-W fault in southern part of quadrangle NZL\A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4]A2152AFine- to coarse-grained, moderately to highly calcareous, turbiditic sandstone interbedded with dark-gray shale and siltstone. The sandstone occurs in beds 20 to 40 inches (50 to 100 centimeters) thick grading upward into finely cross-laminated, muscovite-rich siltstone and shale. The bases of sandstone beds commonly are marked by flute casts, ripple marks and rip-up clasts of underlying shale layers along with grit-size grains of quartz and chert. The siltstone and fine-grained sandst`Ftheshallowmarinedepositsinthelowerpartoftheunitks\VshaleMW\WAWRWSWUW\W]W_WWWWcWvWWWWWWWW W W W WWWW2WKWLWshallowsWUW\WVWWWWWWW W&W)WJW)Wshallow-marinelimestoneanddolostonefacieshavingreporteVngreporteVVVlow-marinelimestoneanddolostonefacieshavingreporteVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVporteVVVVlow-marinelimestoneanddolostonefacieshavingreporteVVVVVV.A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A1602BIncludes a wide variety of shallow intrusive rocks including rhyolite, dacite, trachyite, and andesite plugs, domes, sills, and dikes and larger more coarsely crystalline bodies of granite, granodiorite, tonalite, and monzonite porphyryCTKiDTertiary and Late CretaceousE?Shallow intrusive rocks of silicic and intermediate compositionA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4Blly to the northeast. Unit appears to be transitional between the carbonate-rich deposits of map unit Kcg and the volcanic-rich deposits of map unit Kvg. Poorly preserved marine mollusks of late Early Cretaceous (?) age are present in this unit in the Selawik quadrangle CKcvgD CretaceousE4Carbonate- and volcanic-clast graywacke and mudstoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A1823A*FMRLFMRLAA3FMRLFMRLA AnnsakeyBnsaunitsA0/ !@FWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.' ABCDEF ABCDEF  #,/03689; ANonmarine, fluvial, delta-plain deposits that grade downward into marine delta-front deposits. Fluvial deposits are characterized by fine-grained, locally cross-bedded quartzose sandstone interbedded with micaeous shale and siltstone. Near the base, the fluvial beds are composed of fine- to coarse-grained, lenticular, crossbedded, friable sandstone and conglomerate containing pebble- to grit-size clasts of quartz and chert and lesser amounts of mafic intrusive and extrusive rocks, and schiBst. Contains bituminous coal seams as much as 3 feet (90 centimeters) in thickness. Sandstone composed of quartz, chert, metamorphic detritus, and subordinate amounts of volcanic rock fragments. The quartzose nature of the lithic clasts (including polycrystalline quartz), as well as the relatively high proportions of potassium feldspar and micas suggest a mixed metamorphic and granitic provenance. These data, when combined with limited paleocurrent data, indicate that the unit progradeW\AThe shallow marine deposits in the lower part of the unit Ks are mapped separately along the Yukon River and in a belt to the west extending from the southern edge of the Norton Bay quadrangle to the western Kateel River quadrangle. These deposits compose a marine tongue that underlies the fluvial deposits and thickens westward. On the Yukon River, the marine deposits consist of fine- to coarse-grained, crossbedded, lenticular sandstone grading down into fine-grained sandstone and interbBedded dark-gray siltstone and shale. In the belt to the west, the marine deposits are composed predominantly of siltstone and shalesCKmsD CretaceousEMarine sandstone and siltstoneBP RA1971ll-indurated, thinly-bedded, dark-gray fossiliferous shallow marine shale containing conspicuous calcareous concretions, volcanic-lithic siltstone, sandstone, graywacke, and subordinate conglomerate. Diverse shallow to deep marine (in part, turbiditic) deposits derived from a northern source, either an unidentified mid-Cretaceous magmatic arc or the Jurassic arc represented in part by the Talkeetna Formation (Winkler, 1992). Upper part of unit is coeval with the flysch of the Valdez GrB}oup to the south. Rests with pronounced angular unconformity on Early Cretaceous and older strata (Csejtey and others, 1978)kCKmDALate Cretaceous (Maestrichtian) to late Early Cretaceous (Albian)EMatanuska FormationF Wilson and others, 1998 (DOGmap)RA1971O!RAFine-to medium-grained, thinly cross-bedded, fossiliferous sandstone and poorly exposed dark siltstone and shale. Clasts composed of 40 to 45 percent quartz, 45 to 50 percent volcanic and sedimentary lithic fragments, and 5 to 15 percent feldspar, chiefly plagioclase. Clasts set in a finely divided calcareous and argillaceous matrix. Unit deposited in a nearshore marine environment. Unit contains abundant early Late Cretaceous (Cenomanian) species of Inoceramus CKssDLate CretaceousE.Shallow marine sandstone, siltstone, and shaleA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4SA1985!TPSA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.49_EsComplexes of shallow intrusive rocks and altered Cretaceous sedimentary rocks of the Yukon-Koyukuk basin, undividedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A2170BObsolete map unitEUngalik ConglomerateA2182AnPoorly sorted fine- to coarse-grained graywacke sandstone, grit, and pebble to cobble conglomerate composed chiefly of volcanic rock and chert detritus. Interbedded dark mudstone. Unit is tentatively assigned an Early Cretaceous age. It locally contains abundant shell prisms thought to have been derived from large- shelled Early Cretaceous species of Inoceramus nCKgcDEarly Cretaceous?E#Volcanic graywacke and conglomerate_zFA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A2336ALithic tuffs, pillowed andesite flows, diabase, and volcanic conglomerate of shoshonitic composition, characterized chemically by very high K20, Rb, and Ba contents and low TiO2 content. Tuffs consists of coarse-grained volcanic rock fragments, crystals of plagioclase and clinopyroxene, and pumice. Flows consist of plagioclase and clinopyroxene phenocrysts in a groundmass of plagioclase laths and devitrified glass. The diabase is compositionally similar to the shoshonitic flows but hasQ<UA1941ANonmarine, fluvial, delta-plain deposits that grade downward into marine delta-front deposits. Fluvial deposits are characterized by fine-grained, locally cross-bedded quartzose sandstone interbedded with micaeous shale and siltstone. Near the base, the fluvial beds are composed of fine- to coarse-grained, lenticular, crossbedded, friable sandstone and conglomerate containing pebble- to grit-size clasts of quartz and chert and lesser amounts of mafic intrusive and extrusive rocks, and schiposed of fine- to coarse-grained, lenticular, crossbedded, friable sandstone and conglomerate containing pebble- to grit-size clasts of quartz and chert and lesser amounts of mafic intrusive and extrusive rocks, and schi1990BLight-gray quartz-pebble conglomerate and quartzose sandstone containing minor intercalated ashy tuff. Intruded by granodiorite of Late Cretaceous (~82 Ma) age. Limited areal extent in the northeast quadrant of the Melozitna quadrangleCKqcDearly Late CretaceousCh XA2180AMassive, poorly sorted conglomerate having pebble- to cobble-sized clasts chiefly of mafic intrusive and extrusive rocks and chert of various colors. Locally clasts of quartz, quartzite, granitic rocks, schist, and limestone are abundant but otherwise only occur in minor amounts. Interbedded fine-grained to gritty, dark-gray to green graywacke and mudstone. Grades upward into unit Kss and in part overlies and in part laterally gradational with unit Kvgm (Patton and others, 1978). Unit Bathought largely Albian but may include beds as young as Late Cretaceous (Patton and others, 1978)OCKcgDLate Cretaceous? and AlbianE7Melozitna sequence: Igneous pebble-cobble conglomerateF Wilson and others, 1998 (DOGmap)XA2180ce: Igneous pebble-cobble conglomerateF Wilson and others, 1998 (DOGmap)XA2180gW YA2181orly sorted, fine- to coarse-grained graywacke, sandstone, grit, and pebble- to cobble conglomerate composed chiefly of volcanic rock and chert detritus in the Medfra and Ophir quadrangles (Patton and others, 1980; Chapman and others, 1985)). Contains locally abundant large Inoceramus, brachiopods, and worm tubes. Includes massive volcanic conglomerate mapped as part of unit Kgs of Patton (1966) in the northwesternmost Kateel River quadrangle. This conglomerate is probably gradationalB0 with coarse breccia and agglomerate of unit KveCKvmD%early Late or late Early Cretaceous?)E#Volcanic graywacke and conglomerateF Wilson and others, 1998 (DOGmap)YA2181VNYAPoorly sorted, fine- to coarse-grained graywacke, sandstone, grit, and pebble- to cobble conglomerate composed chiefly of volcanic rock and chert detritus in the Medfra and Ophir quadrangles (Patton and others, 1980; Chapman and others, 1985)). Contains locally abundant large Inoceramus, brachiopods, and worm tubes. Includes massive volcanic conglomerate mapped as part of unit Kgs of Patton (1966) in the northwesternmost Kateel River quadrangle. This conglomerate is probably gradationalB0 with coarse breccia and agglomerate of unit KveCKvmD%early Late or late Early Cretaceous?)E#Volcanic graywacke and conglomerateFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.\A2101<kLUA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4VA1990AComposed chiefly of well-sorted and well-rounded clasts of white quartz and/or metagraywacke in a quartzose and micaceous matrix; schist, chert, greenstone, and limestone clasts occur in subordinate amounts. Conglomerate is interbedded with quartzose, cross-bedded sandstone and carbonaceous and micaceous mudstone. Contains rare interbeds of ashy tuff. Plant fossils and thin bituminous coal seams are locally abundant. Unit composed chiefly of debris eroded from the Arctic Alaska and RubZ[P]A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4Y]Bone generally contain thin layers of finely comminuted, carbonized plant debris. Calcareous discoidal concretions as much as 8 inches (20 cm) in diameter are common. The sandstone typically consists of poorly sorted clasts of quartz, chert, feldspar (chiefly plagioclase), muscovite, and carbonate rocks in a carbonate-rich matrix. Carbonate composes as much as 50 percent of the sandstone. Unit contains sparsely distributed ammonites of late Early Cretaceous (Albian) age and is interprCeted as a prodelta facies approximately correlative in age with the marine sandstone, siltstone, and shale deltaic deposits of unit Kms dCKcsD CretaceousE3Offshore calcareous sandstone, siltstone, and shaleY\_A2115AInterlayered siltstone, shale, sandstone, and conglomerate originally subdivided into coarse- and fine-grained units (Weber and others, 1992). Siltstone and sandstone are medium- to medium-dark-gray and greenish-gray, moderately sorted and very fine- to medium-grained. Conglomerate is dark-olive-gray to medium-dark-gray, iron-stained, polymictic, unsorted, subangular to well-rounded, ranges in grain size from granules to cobbles. Clasts are of local derivation and consist of quartzite, granules to cobbles. Clasts are of local derivation and consist of quartzite, [_Blimestone, mafic and felsic igneous rocks, greenstone, diorite and other intrusive rocks, sandstone, siltstone, phyllite, chert, rare grit, shale rip-ups, and very rare carbonatite. Beds are typically internally massive, large- to medium-scale, graded and amalgamated, having planar tops and bases. Local small-scale trough-crossbeds internally fill large-scale troughs and fining upward cycles are common. Conglomeratic graywacke occurs within lenses in unit. Minor small-scale scour-fillsCc locally fine upward into ripple-laminated medium-gray to black siltstone, and dark-gray to black shale. Albian age based on presence of Paragastroplites flexicostatus. Graywacke rich in volcanic detritus is locally characteristic and may correlate with the Kathul Graywacke in the Charley River quadrangle east of the map area (Dover and Miyaoka, 1988)?CKwcfDCretaceous, AlbianEWilber Creek flysch`A2105, 1998 (DOGmap)`A2105`AChiefly dark-greenish-gray, fine-grained to gritty, poorly sorted turbiditic graywacke composed largely of first- and second-cycle volcanic debris, but locally containing abundant granitic and metamorphic rock debris. Dark-gray mudstone interbeds. Graded bedding common. Contains some intercalated crystal tuff. Age assignment based on correlation with similar unit in Hughes quadrangle to north of map area (Patton and others, 1978). Unit stratigraphically underlies Norton Bay and MeloziBtna sequence sedimentary rocks and is thickest in Lower Yukon sub-basin (Patton and others, 1994a) on west. Unit interpreted as submarine fan turbidite (W.W. Patton, Jr., oral commun., 1998)CKvgmDCretaceous, AlbianEVolcanic graywacke and mudstoneaA2125, 1998 (DOGmap)aA2125kaATFine- to coarse-grained quartz-carbonate sandstone and conglomerate, quartzose limestone, and pebbly mudstone and siltstone. Sandstone clasts composed chiefly of quartz, carbonate rock, and quartz-mica schist debris. Unit contains abundant marine mollusks and belemnites of Early Cretaceous (Valanginian, Hauterivian, and Barremian) age.TCKqsDEarly CretaceousEQuartz-carbonate sandstoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4={ theWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWuBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWWoWWoWWoWWoWWoWWoWWoWWoWWoWWoWWnWoWpWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWwCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWwilsonBWCWDWEWFWMW\W]W^WcWlWoWpWa theWWWWWW W!W"W&W)W,W-W.W0W1W2W7W<W@WAWBWCWDWEWFWGWIWKWLWthecomplexesconsistof1acumulatemagmaticsuitecompose[VV V!V"VNGA9ERA_ASBzBxAyB}A@|B<A= B:A3!B6A/"BOAM&@pAA(B])BKAI+A-AG.AE0@A?1A52A7@:@E <AA@@AAABBA)ACBDAEAEFB*GAIAAJLA9A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A2106AMassive, poorly stratified pebble to boulder conglomerate, interbedded with dark graywacke and dark finely laminated mudstone. Unit composed of debris flows and alluvial fan deposits. Consists chiefly of andesitic volcanic rock detritus, but locally includes notable amounts of granitic and fine-grained tuffaceous material. Unit overlies volcanic breccia and agglomerate of unit Kv of the Koyukuk terrane. Unit stratigaphically overlies unit Kv and underlies unit Kcc. A granitic clast frB5om conglomerate yielded a K/Ar cooling age of 113 Ma #CKvcD CretaceousE2Volcanic-clast conglomerate, sandstone, and shale &Ä3!@ÄD@ÄfS@ÄhQ@Äv3@@10@110@1969@q1970@1977@1979@1982@,1989@1992a@1997@ W1997a@20@390@40@52@90@about@adjacentadjoining@age@age-diagnostic@ages@all@altered@amounts@amphibolite@and@\and/or@andesite@andesitic@approximately@Barea@lareas@arkosic@ash@associations@banded@Tbasanite@bases@9because@1bedded@bedding@beneath@bettles@bidzbig@biotite@blocks@boulder@buchia@chia@augeng@boulder@buchia@buchia@lastomylonitic@boudins@buchia@ltst@nenana@north@not@orthogneiss@Xk@kBlnAmoBp@nBs@pAsu@uAv~w@F~@~EC@AF€@AF€@A€A€A    €@€A€A A   €A €A €AF€€F€F€F€F€F€F€€€€F€€F€F€F€F€€F€€€€AC€B€A€A€A€ACE€B!D"€A%C&E'€B)D*€A-C.E/€B2D3€ A6C7E8€!B:D;€"A€#B?D@€$ACCDEE€%BHDI€&AJCKEL€(AM€)AO€*AP€+AQ€,AR€-ASCT€. E!Tholeiitic basalt cones and flowsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A350BIncludes the Wrangell Lava consisting chiefly of basalt and andesite in the southeastern part of the map area and olivine basalt and vesicular andesite in the northern part of the map areaCQTbDPleistocene and PlioceneE Basalt flowsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 A6402@rhyolitehypabyssalbodies^Vrhyolitic\Wrhyoliticvolcanicandsedimentaryrocks\Vrocks\WcWoWpWsWvWxWAWDWkWoWpWuWwWWWVWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWW)W+W,W:W;WJWrubyWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWhVXCW?W@WAWBWCWDWFWGWHWIWJWKWLWMWOWPWRWSWTWVWWWXWZW^W_WaWbWcWdWeWfWkWlWmWnWpWqWtWuWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWV1*beddedVWeWWW)W+Wed-bariteqWqWqWqWqWqWWWbeenMWNWVWWBWHWIWJWTWbela^W_WhWuWvWwWbelowZW\WbeltGWHWIWJWbelugaHWbethelBWbetter\WbetweeneWlWmWuWvWwWyW@WRWbigAW^WuWvWwWbiotiteVWfWgWhWiWjWmW{WEWFWGWbiotitebiotite-hornblendeandhornblendegranodioritequarthVbiotite-amphibolefWbiotite-bearingfWbiotite-bearingperalkalinealkali-feldspargraniteandbiotfVbiotite-hornblendegWhWiWjWmW{Wbiotite-muscovitelWbiotite-plagioclasefWbiotiticVWbioturbationPWbituminousSWUW[Wblack]W_Wblastomylonitic@WblocksWbodies[WeWkWmWyWzW|WW@WbordereWkWbothMWNW[W^WboulderPWYWboumaRWboundaryRWboxBWbrachiopodsXWYWbraidedPWVWbrecciaWWZW\WcWdWpWqWuWvWwWxWBWXWYWbroadlyVWbrownAWSWbrownish]Wbrownishblackolivinebasaltvesicularinpartlocallydisp]VbroxsonEWFWVisAWSWVWWWXWYW]W_W`WkWnW'W6WVWZW[W_W`WWWWWWWWWWWWWWWWWWWWWW W!W"W'W)W-W.W1W<W@WAWBWCWDWEWFWIWFWFWFWFWFWFWFW1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W.W.W.W)W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWochronWWisoclinally WisolatedWisomSWisotopic-W.WitBWeWWWWWWWWWWW W!W"W#W$W%W&W5W6WNW_WWWWWWWWWWWWWWWWundatedDW^Wundatedpartsofthealaska-aleutianrangebatholithintheDVunderlainBWunderlievWunderliesWW\W`WWWWunderlying]WkWunderwent<W@WAWBWCWundividedpWWW0Wundividedassemblageof1biotitegraniteandgranitegneissVundividedassemblageofinterlayeredimpuremarblequartz-mi0VunequivocaleWleWeWeWeWeWeWfWfWfWfWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWfWfWfWeWfWfWfWfWfW]WtWuWunequivocaldWeWfWWWWWfWfWKW<W[W\W]WtWuWunequivocaldWeWfWWWWWWWWW W W W W WWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W-W.W/W0W1W2W3W4W5W6W7W8W9W:W<W=W>W?W@WAWBWCWGWHWIWJWfalkalic@amphibolite@andAandesite@&argillaceous@/bodies@%calcareous@"coal@!composition@deposits@diorite@flows@granite@?hills@#flows@granite@?te@?andstoneandcorre@flows@granite@?/Lflows@lgranite@/ndcorre@Lflows@lgranite@/ntrocksofthenixonforksequencemeta-q@]metamorphicbasementrocksofthenixonforksequencepeliti@\metaplutonic@Jmysticanddillingerstratigraphicsequencesundivided@Fmysticstratigraphicsequenceolderlimestone@Emysticstratigraphicsequenceshaleandchert@Dmysticstratigraphicsequencesheepcreekformationandcorr@Cmysticstratigraphicsequencetatinarivervolcanicandequi@BlAmysticstratigraphicsequenceundivided@@nelchinalimestoneb2nenana@-nixonforksequenceparadiseforkformationandunnamedcorr@M@0fmoresWcWWWWW&W2WJWmostXWkWmostly[WW W!W"WmottledXWmountvWuWWWzWWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWsortedWWYW]W_W`WbWWWWWWIWsoundMWsourceUWW WsouthMWWWWIWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&WEWsoutherlyeWfWgWsoutherngWlWmWBW WWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W0W4W5W7W8W9WgWsouthwest@W W WWWWW-W.W5WJWKWLWsouthwesternyWzWRWiWjWkWlWmWNWdWeWfWgWspeW W2W3W:WspanneddWsparite;WsparseAW[WWDWFWsparselyiWjWkWlWmWsphene@Wspiculite2W3W6Wspiculitic2W3WspiliticVWWWsppWspurious[W\W]WspurrWsq7W8W9Wsqd0Wsqm0WstjWrWW<1includesthewrangelllavaconsistingchieflyofbasaltandFVincludesunsortedtopoorlysortedtilloutwashsandandgraVVIVincludingCWsWvWUWkWoWWWeWWWWWWWWWWWW WWIWJWincreaseVW)WincreasinglyXWsinglyXWXWXWXWXWXWyXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWXWeasinglyXWXWXWXWWWWWWWWWcreasesGWWWWWWWWWWWWWuWindicates WW/W2W3WdWeWfWindicatingOW:WkWlWmWnWindicativeuWindividual1WinduratedAWHW Winfer;WgWinferencecWdW2W3WinferredWWWWWWWWW W!W"W#W$W%W&W/W4WQWWWWWWWWinfoldedQWinformal[W\W]W^W`WdWeWfWWWsecond-cycle`Wle`WWtionSW[WoWsedimentVWsedimentaryHWMWNWXWZW\WbWxWAWOWTWseecWRWseparatedHWIWJWsequenceAWTWVWWWXWdWlWGWHWIWJWOWRWZWsequencesMWNWseriesBWHWIWJWserpentinizedWEWFWsethkoknaoWseveralkWshadesSWshaktolikTWshaleAWKWMWNWPWSWVW\WpWqWAWOWPWQWRWSWTWUWZW[W\W_Wshallow[WQWSWTWsheepcWshelfPWshow@WshownTWsideLWsiliceousBWRWsillimanite-bearing@Wsills^W_WdWkWtWsiltCWsiltstoneAWJWKWMWNWPWQWRWSWTWUWVWWWXW\WBWHWIWJWOWPWQWRWSWTWUWZW[W\W_WsimilarMWNWRWTW[W\W^W_W@WHWIWJWTWsingledWsischuoWuWvWwWsizePW_WslateAWsleetmute]WgWuWvWwWyWBWRWSWslightlyeWsliversAWsmall[W\W^W_WbWeWgWkWmWsmall-scale_WsmithDWEWGWHWIWJWKWLWsnowcapbWsolieHWpWqWsomebWdWkWBWOW]W^WsometimesdWexposedMWRWWWW W W WW0WKWLWexposureWexposuresvWW,Wextending\W,WextendsWextensiveWtensiveWWextentWWWWWWWWxtentWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWextentVW WWWWWWWWVextensively7W8W9WextentVW WWWWWWWWWWWWWWWVextensively7W8W9WextentVW WWWWWWWWWWnW}WGWPWRWSWUWfinetomedium-grainedhypautomorphicgranularquartzdiorit}Vfine-grainedAWaWBWUWfinerTWfinesPWfissileAWflatsTWflow@WflowsDWEWTWVWWW[W\WbWdWeWoWpWqWuWvWwWxWyWKWLWOWfluteRWfluvatileHWOWfluvialCWfluviatileAWRWTWUWVW[WOWfluviatileandalluvialfeldspathicandbiotiticsandstonecVV$porphyritic^WlW{W~W`WWWWporphyroblastsWporphyroclasticWporphyrysWyWWWWWWWWGWJWpossibleAWpossiblynW`WbWfWWWpotassiumUWnW'WWW WW7Wpotassium-richnW'W'WWWW WW7Wpotassium-richnW'W'W'W'WichnW'W'WppapWWWcWWWWWWWWWpascWWWWWWWWWWWppascWWWWWWWWWppascWWWWWmediumtomedium-dSVpredominatecWprefer_WpreferredTWprehniteVWprehnite-pumpellyiteWW Wpresence_W WpresentkWOWRW[WeWfWgW2W3WJWVWpreservedWWWWUWhWiWpressDWEWKWLWMWNWWWWWWW W!W"W#W$W%W&W0WtWuWWWWWWWWpresumablypWpresumedWWjWWnorthMW`WZWWnorth-centralWnortheastvWWWWWWWnortheasternVWWnorthernFWnorthwestAWZWnorthwesternvW0WnorthwesternmostYWWDWnortonMW\W`WWWW,W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0WW,W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW`WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW`W`WWWWWW[W]WgWlWmWuWvWpartingsRWpartsTWUWmWpattonbWcWoWpWqWuWvWwWpatton's[WpebbleAWHWYWpebblyAWMWNWYW7aconglomeraticXW_WconglomeriticVW)WconodontVWWWWW)W+WngiWiWiWnodont-bearinghWiWWconsistAW\WbWOW_WaWconsistentlyGWconsistingFWKW[W_WMWdWconsistsAWHWKWWW^WdWmWuWvWwWxWOWTWdWeWconsistsofbiotiteandbiotite-hornblendegranodioritelargmVconsistsoflightgraytopinkrhyoliticvolcanicrocksanduVvVwVconsolidatedAWLWconspicuousQWconstraineddWcontact@WAW\Wcontacts@WcontainAWTWUWOWcontainingAWRWVWOWPWQWRWVW`WcWcontainsoW@WXWYW[W]W`WcontinentalOWPWcontrastPW@WcontrolVW[WPWaWcontroversialRWconveyeddWcookDWEWHWKWLWcoonradBWcorrelate_WcorrelatedHWIWJWcorrelationTWHWIWJW`WcorrelationsTWcorrelativeAWSW@WUWcottacWcrassicolisaWcream\WcreekMWNWSWcWuWvWwWAWcWcretaceousoWW@WBWEWFWOWQWTWUWVWWWdWcropOWWWfoldedWfoliated_WWWW7Wfoliatedgneissicgranitecomposedofalbitepotassiumfelds7Vfor{WWWWforaminiferaeWfWfork3W3W3W3W3W3W3W3WW3W3W3W3W3W3W3W3W3W3W3W3WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWorkcWpWWWWWWWWWWWWWorkcWpWWWWWWWWWWWWWWWWWW(W)W*W+W,W1W4W5W6WpWrWWWWWWWWWWWWWWWWWWformationsHWMWNWWjWWWformedWWWWWWformerlybWWWforming0Wforms[W0WUWWS6ngWnilkokaWnixonvWnoDW_WWnoatak3Watak3W3W3W3W3W3W3W3W3W3W3W3W3W3W3W3W3W3W3W3WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWNWTWdWgWlW}W@WEWFWGWHWIWJWKWLWMWNWeWfWgWWWWWWWWWWWWW W!W"W#W$W%W&W0W7W8W9W=W>W?W@WAWBWCWGWHWIWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWnon-marineSWnonmarineHWSWTWUWZWtWnonplutonicWWWWWWWWWWnorian2W3W:WkWlWmWnWnormalZWtlmonzogabbro|WmonzonitesWyW|WsWuW^WWWWWWJWmorainalWWIWWWWWWWWWWWWWWWWWWWWWWWWWWWW|W}W~WW/W0W^WWWmorainalWWWWW4WJWQW_WbWWWWWWWmostRW[WgWkWzWHWIWJWdWfWgWiWjWkWlWmWUWWWWWWWWWWWWWWWWWWWmostlyQWyW-W.WWWWWWWmotionsdWmountAWTW^W_WcWdWgWhWlWmWuWvWwW}W~W@WEWFWGWHWIWJWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWW5W7W8W9W=W>W?W@WAWBWCWGWHWIWPWtWuWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWW5WWdf stretched-pebbleVWstrikeWWWstringersWstrongWstronglyWstronglyfoliatedquartzofeldspathicgneissconsistsofacoVstructuralWstructurallyWWVWW)WstructureBWstructuresDWWstrucurallyVW)W)W)WurallyVW)W)W)WallyVW)W)W)W)W)W)W)W)W)W)W)WW)W)W)W)W)WVWVWVWallyVWVWWWWWWWWWWWWWWWWWWWar_WsubbituminousMWNWsubcircularis7W8W9WMWkWlWmWnWsubdividedHWOWBWTWZW_W WvWwWWsubdivisions`WWsubductiondWsubjacentpWsubjectedWWsublaevis WsubleavisaW Wsubmarine^W`WW=W>W?W@WAWBWCWWsubordinateAW[WbWGWHWIWJWQW\W^WeWiWjWkWlWmW WWW5W7W8W9WJWWW^W_WaWcWdWeWfWkWlWmWnWpWvWwWWx1997avWzW1998`WWWWEWZWW1:63.360W2MWWW[WWWW W!W"W"W"W"W W!W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W2.2WWWWWWWWWWWWWWWWWWWWWWWWWWWWWW2.2WWWWWWWWWWWWWWWWWWWkWlWmWnW2000JW210XW25fWWWWWWW W!W"W#W$W%W&W25-m-thickoW269[W\W]W27fW28xW29fW@W295W3eW WtWWW3.4W30kW W1WWW30-45cW30-m-thickWW30.6HWIWJW302dWeWfW3090W31fW31.9GW311WW319W32fW34gW34.8kW35WW350WWlight-weatheringWlight-yellow\WligniteMWlimezWWWWWlimestoneVWWW_WaWWWbWeWfWvWWWWWWWWWWWWWWWWlimestone-clast W WWKWLWWWWWWWWWWWWWWWWWWWWWWWWWW W WWWWWWWWWcropareaoftheundivideddilimestone-clast W WWWWWt W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWst W WWWWWWWWWhertoWWWchertoWWWWdark-grayshaleand\VbundtzenvWeWzWbutAW`WkWuW~W_WvWWWWWWWW W WWWWW1WEWFWKWLWbuttonWWWWWWWWWWWWWWW1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWWWWWWWWtaclastiteWcenterbWcenters[WcentralDWEWeWKWLWcephalopodsaWchapman\WlWpWqWuWvWwWRWSWTWXWYWcharacteristic_Wcharley_WchertBWoWWBWRWWWXWYW[W]W^W_WdWeWhWchert-pebbleMWNWeWcherty\WeWchickaloonAWVWWchieflyFWGWdWyW{W@WBWCWDWEWFWMWNWOWWWXWYW]W^W`WiWjW-tillWWIWWWWWWWWWWWWWWWWWWWWWWWWWtjds_WtkbHWtkggGWHWIWJWtkgs@WtkvbWuWvWwWtkvdpWqWtkviiWjWkWlWmWtkvroWtkvtpWqWtmmWtmgfWtnepfWtoAWDWEWGWHWKWLWPWSWVWXWYW[W\W^W_WaWbWcWdWfWgWlWnWuWvWwWzW|W}WW@WAWBWEWFWGWHWIWJWKWLWNWOWPWQWRWSWTWUWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWiWjWkWlWmWoWpWqWrWsWtWuWvWwWxWyWzW{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@WAWBWCWGWHWIWJWKWLWMWNWOWQWUWWW9fossilVW6WfossiliferousRWeWfWWW WfossilsoWSWVWWWW_WeWWWWWW&WfosterWWXWYWzWWWWfoundkW_WWfractionsWWGWfragmentsRWUWnWWWWcWWWW W WWW2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2WW2W2W2WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWgWhWiWWWWWW W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW4W7W8W9WGWHWIWJWKWLWNWOWPWQWUWZW_WbWdWeWfWgW elevationBWWWIWelevationsZWelliottDWellipticalWelsewhereWWWembayedWemplaced&WemplacementWWWenclosedWWentirelyWWenvelopedWenvironmentRWW WeolianWWIWepidote&Wepidote-amphibolite<W@WAWBWCWepidote-rich0WequigranularlW{W|W~WWequivalentZWvWWerodedVWWWodedVWWWWWWWWWWWWWWWWWWWWWWodedVWWWWWWWWWWWVWWWWWWWWWWWWdedVWWWWWWWWWWWWWWWWWWWWWWWWWWWdVWWWWWWWWWVWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWVWWWWWWWVWWWWWWWWWWdVWWWWWWWWWWerodedVWWWWWWWWWWWWWWWedVWWWWWWWWWW!W"W#W$W%W&WeventsWWexcept|WexplainedcWexploration W40RW]WW W40ar[WW W!W"W40ar/39arEW[WW W!W"W421_WW45RWSW'W W5MWRW'WW WW50vWRW]W'WW WGWWWWWWWWWWWWWWWWWWWWWWck514WWWWWWWWWccretionaryWWaccumulationsbWacrosskWageAWHWKWPWVW[W^W_W`WbWcWdWfWkWoWuWagesVWaWdWgWiWjWkWlWmWagglomeratedWalaskaLWMWNWalkali-feldsparfWgWalllWmWalluvialPWUWVWalongoWalsoAWDWEWKWOWSWTW[W]W^W_WbWcWdWeWfWgWkWlWmWpWqWuWalsoincludesunnamedfluvatileconglomerateandcoal-bearinOValtereddWiWjWalthoughdWamountsMWNWanAWmWanchoragePWWW[W^W_WfWgWhWkWandAWBWCWDWEWFWGWHWJWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWjWkWlWmWnWoWpWqWrWsWtWuWandesiteFWGWTW[W_WaWbWcWdWBandesitickWvW'WWangayuchameWangayucham-tozitnaVWWWW&Waphanitic`Waplite0W7WapparentkWappearanceXWappearsvW[WcWWWWW W!W"W2W2Wapple9W9W9We9W9W9W9W9WW"W"W"W"W"W"W"W"WW"W"W"WW!W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWW&WWWWWWWWWWWWjWkWlWmWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WW W W WWWWWWareaAWBWDWEWFW\WgWlWmWrWsWuWvWwWxWyWzW|WBWKWLWMWOWZW_W`WiWjWkWlWmWnWoWpWqWWWWW WWWWWWWWWWWW W!W"W#WarealVWareasAWBWbWrWsWtWuWvWwWOWaWoWpWqW WWargilliteAW\WOWdWeWW W WWarkoseOWxrubbleBWrubyvWAWUWVWVWZW^WcWeWWWWWW WW)W2W7WsaWWaWWsable4W4W4W4W4W4Wle4W4W4W4W4W4W4WWuaryMWNWsandCW;WsandstoneAWHWJWKWLWMWNWOWPWQWRWTWUWVWWWXWYWdWpWqWOWPWQWRWSWTWUWVWXWYWZW[W\W]W^W_WaWbWcWeW WWWWWW4W7W8W9W:W;WJWKWLWNWdWsandstonesiltstoneandcoalJVsandstonesiltstoneshaleandconglomerateincludesfinetoRVsandwiched Wsandy6W7W8W9WscaleZWscalesdWscatteredrWsWtWWscgbWWWWWW W!W"W#W$W%W&WschistW@WAWGWHWIWJWWWaWWWWW-W.W/WschistoseEWFWWWWWWWWW W!W"W#W$W%W&W-W.W0Wschistosequartzdioritequartzmonzonitegranodioritehornb0Vschistosity@Wt@sunitscWAW_WkWWW WYWZWvWWWWWWWWW'W0WEWFWFWFWFWFWFWFWFWFWFWFWFW6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W'W'W'W'W'W'W(WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWrted_Wup@WfWgW5WupliftWupliftedVWupmostaWupperUW[W@WQWUW\WcWWWWWW0W2W3W5WUWkWlWmWnWxWWuppermemberdominantlythin-beddedveryfine-grainedspicul2V3VFpercentRWSW]W'W6WW WWperidotiteDWXWWWW]W'W6W WWperidotiteDWXWWWWWWWWWWWWWWWWWWWWWWWWWWWW]WgWpWtWpersonal_Wpervasive@WWWpervasivelyWWWW WpeweQWpggWpgcRWSWTWphaWphacoidallyWphase(W)W*W+W,W4Wphases@WHWIWJWphlogopiteWWWWWW W!W"W#W$W%W&Wphosphatic;WkWlWmWnWphylliteHWIWJW_WWRWSWTWYW_WdWeWfWphylliticOW;W_WvWwWpillowWWZW]WWoWpWqWPWRWSWTWVWYWkWlWmWnWtWxWpillowsWpilotaxiticrWsWpinkuWvWwWJWpjaHWIWJWpjcgHWIWJWpjtHWIWJWplaceWWplacedGWplacementRWplacescWWYWplafkercWWW0Wplagioclase W|hypabyssalpWyWwWWW W WWWKWLWice-contactWWIWidentifiedXWWiditarodkWeWigneous_W_WWWijoliteWimportantWimpureWWW+W0W0W0W0WW0W0W0W0W0W+W0W0WW0W0W0W0W0WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWimpureoWpWqW W2W3WWWWWWWWWWWWWWWpWinches[Winclude[W\WuWvWwWWWcWincludedAW[WbWgWoW@WRWTWoWincludesAWBWDWEWFWKWOWSWTW[W]W^W_WbWcWdWeWfWgWmWpWqWrWsWuWvWwWxW{WAWBWGWHWIWJWKWLWMWOWRWXWYWZWiWjWkWlWmWincludesanumberofdifferentunitsmappedinvariousareasAVincludesawidevarietyofgraniticrocksexposedthroughoutgVincludesrubbleofmetasiltstoneandchertinthekantishnaBVvthenWthereforeW-W.W<W@WAWBWCWEWFWtheseMWUW\WkW'WWWW W WW W WW W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WWWWWWWWWWrlocallyinterlayeredgneiVthickcomplexlydeformedaccretionarysequenceofflyschandWVthick-beddedXWbWWWWMWOWWthickeningWthickest`Wthickly<WthicknessUWVWOW[WJWWthinAWLWTWXWkWOWdW WWWWJWKWLWdWeWfWhWiWxWWWWWWWWWWwillZWwindWwind-blownWwindsWwinklerWWwisemaneW9WW9W9W9W9W9WW9W9W9W9WneW9W9W9W9W9WeWeWfWfWfWfWfWfWfWfWfWfWfWfWWeWfWfWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWeWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWWWWWWWWWWwiseman_WdWeWfWWWWWWWWWWWWWWWWwiseman_WdWeWfWWWWWWWWWWWWyetnaxWyieldgWyieldedkWEWFWdWeWfWgWyieldingiWjWlWmWGWrWsWtWuWvWwWxWyWzW{W|W}W~WyoungdWWWrWsWtWuWvWwWxWyWzW{W|W}W~WyoungereWyoungest@WGWyukon`Wyukon-tananaAWzircon@WzoneeWdWUyydeformed'WW0WdeltaSWWWzWdelta-frontUWW Wdelta-plainUWW Wdeltaic]WdependingWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWdepositionVWXWOWW4WMWuWWdepositionalPW W2W3W7W8W9WpWWWWWWWWWWdepositionallyWWdepositsDWEWLWKWLWQW\W WWWWderivation_W WderivedUWVWEWFWHWIWJWQWWWWGWHWIWJWUWpWWWWWWWWWWWWWWWWWWWWIquadrangleBWMW\WcWvWyWAWDWVWWWYW\W_W`WkWuWWWWWW WEWVWWWXWYWZW^W_WcWeWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW"52W53W54xW55'W56lW56m^W6XW60'W6WW600WWIW63{W64xW65uWWW66|W663W69yWW70vW|WuW705DW71{WW76sW78~WW8]W'WW85uW850W86VW87pW89~WW9eWWeWeWeWeWeWeWeWeWeWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWfWfWWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWWWWfWWWfWWfWWWfWWWfWWWTWaWdWeWfWgWhWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWW W W WWWWWWWWWWWWWWW W!W"W#W$W%W&W-W.W0W2W3W4W5W:W;WJWKWLWMWPWRWSWTWUWVWZW_WbWdWeWZnotWWnotableWnoviWnovimountainformationshallowwaterdepositspredominatelyVnowitnaCWvWWWWWnulatoVWZWzWWW)WEWFWnumerousDWyWWWWobliteratedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWoccur[W|W@WAWPWWWeWfWgW W WWKWLWWWZWaWWWWoccurredWoccurrence\W]W7W8W9WNWkWlWmWnWxWoccurrencesWoccurring WWWoccurs_WdWfWgWhWWWWWWWW W!W"W#W$W%W&WMWZWqWWWWoccursinlimitedareaineasternlimehillsquadrangleimpoqVoceanMWoceanicdWWoceanic-platedWoclsWodW7complexyWAWZWW0WcomplexesvWyWSW[WWW W!W"Wcomplexesarecomposedofsmallclosely-spacedrhyolitedaciyVVcomplexlyW0WcomponentWWcomponentsW0Wcompose\Wcomposed^WoWxWyWRWSWUWVWWWXWYW\W`WaWoW6W[W_W`WbWWWWWWWWWWWWWWWWWW W WWWWWWWWWW W!W"W7WIWcomposedchieflyofwell-sortedandwell-roundedclastsofwVVcomposedofquartz-carbonatesandstoneandconglomerateint6Vcomposes]WcompositionWcompositional^WcompositionallyWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW_WaWbWcWdWeWoWpWqWW WWWWWW6W:W;WJWNWOWbWcWgWkWlWmWnWoWpWtWvWwWxWtmineral[WW W!W"W&W-W.W<W@WAWBWCWminerals^WoW'WWWWEWFWGWminor\WvWAW_W'WWWXWZW[WvWWWWW W!W"W%WW%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W%W!W"W%W%W%W%W%W%W%W%W%W%W%W1W%W%W%W%W%W%W%W%W%W%W"W"W"W"W"W"W"W"W"WW!W"W"W"WWWWWWWWWWWWWWWa_WmlueWmmpWWWWWWWWWWmnleWmnoeWmoderatelyAWHWLWdW@WAW]W_WKWLWmoderatelydeeptodeepmarinesequenceoftightlyfoldedanKVLVmoffitWWWWmolWmoll-stalcupcWTWmolluscan\WmonomictWmonotis2W3W7W8W9WMWkWlWmWnWmonotonousXW Wmonotonoussequenceofintenselydeformedandlocallyhighly VallkWalluvialCWWWWWWalluviumWWIWalmostWWalongMWAW\W]WWWWWWW,WIWalsoBWvWkWWWbWeWzWWWWWWWDWEWFWFWFWFWFWFWFWFWFWFWW6W6W6WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWandalusite@WandesiteFWGWTW[W_WaWbWcWdWxWyWHWIWJWMWNWeWiWmlivengoodAWuWWWWXWYWvWWWWWWWWWlobeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWobeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW'W-W.W2W3W:W;Wlocallymappedunitconsistingofunitskjwcandkwcfinthe VlocatedDWEWMWNWKWLWlongfWgWWWWWWW W!W"W#W$W%W&WlowerUW[WTW\W`WaWcWWW W WW2W3W5W6W:W=W>W?W@WAWBWlozengesAWmHWOW[WW1W7W8W9Wma`WaWcWdWfWgWiWjWkWlWmWnWuWvWwWyW|W@WEWFWGWHWIWJWVWrWsWtWuWvWwWxWyWzW{W|W}W~WW WWW'W/W0WmackevettWWW2W3W5WW4€ASheared metamorphosed porphyritic quartz diorite. Contains biotite phenocrysts as large as 1 cm and numerous micro-veinlets of quartz (Silberman and others, 1979). K-Ar age on biotite yielded an age of 921+/-25 Ma and muscovite from mylonite along border yielded 663+/-20 Ma (Silberman and others, 1979). Intrudes quartz-mica schist of unit ZYnm in the southwest Ruby quadrangle. Corresponds to unit pCm of Silberman and others (1979)CYnqdDmiddle Proterozoic?EJMetamorphic basement rocks of the Nixon Fork sequence, Meta-quartz dioriteFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.ges range from 120 to 1230 Ma. Corresponds to unit Xi of Miller and Bundtzen (1994)CXiDEarly ProterozoicEIdono metamorphic complexF Wilson and others, 1998 (DOGmap)2|pillow@Nplagioclase@Cplanar@plutons@poorly@porphyritic@pr@$predominantly@uprimarily@proterozoic@3ps@ pyroxene@pzs@quadrangle@Iquadrangles@quartz-chert@quartzofeldspathic@r@radiometric@ranging@raven@reefy@relatively@resolve@ rhyolite@rock@nrocks@Aroots@rubble@same@scale@schistose@schwatka@second-cycle@section@separately@Vset@shale@shallow-water@sheet@sill-like@like@@shallow-water@-water@@shale@shallow-water@ater@rgiteanddunitenotdirectly@sgd@shallow-water@otdirectly@sgd@shallow-water@eanddunitenotdirectly@ntercalatedsequenceinvario@units@wm@4zoned@0_gradationalYWWgradationallyWgradeUWoWVWWWZWWWW WWW)WGWgraded_W`WWWW1WgradesSWVWWWWgrading\WXW\W]W_WWWgrain_Wgrains]W'W6WgrainstoneWWWWWWstoneWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWGWHWIWJWTWWW`WoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWgranodioritegWhWiWjWmW{W@WVWrWsWtWuWvWwWxWyWzW{W|W}W~W(W)W*W+W,W0WyWzW{W|W}W~WWWWgranodioriteofrainbowmountaininthemounthayesquadrangyVzV{V|V}V~VgrantzbWgranular}WgranuleHWSW;Wgranules_WhWiWrWWWZWWradiolari`Wradiolaria6WVWbWeWfWWW)WradiolarianoWVWbWfW)Wradiolarian-bearingeWeWeWeWeWfWfWfWfWfWfWfWfWfWfWfWfWingeWfWfWfWWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWfWWfWfWfWfWfWW%W&WrampartXWYW`WbWrangeLWMWNW[W^WbWcWgWyW|W@WCWDWGWHWIWJWfWgWrWsWtWuWvWwWxWyWzW{W|W}W~WW WWWW'W(W)W*W+W,W4WUWXWdWeWrangeskWuWvWwWzW_WiWjWkWlWmWWWWWWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W-W.Wranging[WdWWWrapidVWWrare_WaWdWnWWWWW WRWSWTWaWrarelyfWgWraspberry-W.WratherUWchieflycrystalandlithictuffsandvolcanicgraywackeintenVchieflydarkcarbonaceousgenerallynonfossilferousshalesi V VVKVLVchieflydark-greenish-grayfine-grainedtogrittypoorlysor`Vgreenish-grayfine-grainedtogrittypoorlysor`V`Vumtodark-graymudstoneandmedium-graytodark]VchieflyvariablyserpentinizedpyroxeniteperidotiteduniteEVFVcircleAWcitedAWRWclastOWclast-supportedYWclasticHWclastsPWoWWRWWW_WclayHWPWclaystoneAWKWLWMWNWRWclose@WEWFWclusterskWcm[WcoalAWHWJWKWMWNWSWUWOWTW[Wcoal-bearingAWMWNWOWcoarseAWIWXWYW_Wcoarse-grainedLWRWUWXWYW[W\W^WcoarseningVWcobbleAWHWPWYWXWYWcobble-sizedWWcobbles_WcoevalVWQWcollectedBWcolluvialCWcolor\WcolorsWWcolumnar]WcommentTWcommon\WkW_W`WcommonlySW]Wcommun[W^W_WcWhWuWvWwWTWZW]W^W`WcompilationHWIWJW Pcross-beddedRWSWUWVWW W WWWcross-laminated]W]W]W]W]WWinationWWWWWWyWzW{W|W}W~WcrossiteWcrude[WcrudelyAWcrystal`Wcrystal-lithicnWcsejteyAWMWNWPWTWVW[W^W_W`WdWeWhWiWjWmWuWvWwW@WGWHWIWJWOWQWeWfWgWhWcurrent-rippleWcurrentsXWcuteWcycles_WcyclicMWNWcylindroteuthisaWdacite[W^W`WbWdWkWoWpWqWuWvWwWxWeWiWjWkWlWmWdacite-andesiterWsWdaciticnWoWpWqWdarkaWRWUW[WoWpWqWdark-colorednWdark-coloredfinetomedium-grainedhornblendeandpyroxene-nVdark-grayAWOWQWRWTWUWWW[W\W]W^W_W`WaWeWdark-graytoolive-graymicaceousshaleandsiltstoneandli[Vdark-greenishWWWWdark-greenish-gray\W]W^W`WcWdark-olive-gray_Wdata\WRWSWdatedWdatediWjWlWfWgWdebrisUW[W`WdeckerRWdeepQWdefinedbWlWBWsc.territoryWtertiarySWtextureAWWtg^WthanBWSWuWWWWthatBWUW\WoWWWWVWZW[W_WfWWWWWWWWWWWWWWW WWW W!W"W&W'W)W<W@WAWBWCWDWGWGWGWGWGWGWGWGWGWGWGWDWDWDWDWBWCWCWCW6W6W6W6W6W6W6W6W6W6W)W)W)W)W)W)W)W)W)W)W)W1W)W)W)W)W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W(W)W*W+W,W-W.W/W0W1W=metamorphismVWW)WEWFWmetamorphosedVWYW_WWWWWWW'W)WEWFWGWmetamorphosedmaficigneousrocksrangingfrommetagabbroanVmetamorposedVWVWVWVWVWVWVWVWVWVWVWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmetavolcaniclasticGWHWIWmeteorHWIWJWmetersW=W>W?W@WAWBWCWKWLWxWmgbWWWWmgshGWmhaWWWWWmiZWmica@WHWIWJWEWJWWWWmicaceousUW[Wmicritic;Wmicrofossils;WgWmid-cretaceousQWdW WFverticaluWveryCW\WAW_WoWWWW_WWWWWWWvesicularFW]WWvesicularandcolumnar-jointedbasaltflowsandlahardeposi]Vvicinity W WWKWLWvolcanicMW\WvWRWUWXWYW_W`WnWoWpW[WbWcWeWzWWWWWWWW W WWWWWWWWWWW W!W"W&W(W2WWWWWWW W!W"W&W(W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W2W(W(W(W(W(W(W(W1W(WW"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW4W=W>W?W@WAWBWCWJWKWLWWWcWdWeWfWkWlWmWnWvWwWWWWWWWWWWWwaterbWmafic^WUWWWXW_WnWoWWW'WWW_WbWWWWWWW WWW&W'W(W(WW(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(W(WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW WWWWW Wcalc-schistamphiboliteaHVIVJVmajorWmanyTWcWW WWmapAWBWDWEWFWPWTWeWgWlWmWrWsWyWzW|WKWLWMWZW_W`WcWfWgWiWjWkWlWmWnWoWpWqWWWWWW WWWWWWWWWWW W!W"W#W$W%W&W-W.W0W6W;WmappedAW\WbWuWvWwW}W~W@WGWHWIWJWOWRWTWXWYWbWcWeWfWgWiWjWkWlWmWnWoWpWqWWWWWW W W WWW4W:W<W?jdvW&WjmtuZWjonesWWjrvW`WzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWing Wkgr@WkgsXWYWkgwZWkhcWWkilometerskWfWgW>arkosiceWfWaroundWEWFWasBWvWAWSWUWYW]W`WkWuWWWW'W6WEWVWXWZW[W_WbWfWWWWWWWWWWWW W W WWW W!W"W)W-W.W1W<W@WAWBWCWEWFWHWKWLWFWFWFWFWFWFWFWFWFWW1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W.W.W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbasinHWbasinsMWNWbasisdWoWHWIWJW\WiWjWkWlWmWbaslathWbatholitheW@WCWDWGWbayZW`WbcdeRWbeAWSWbWkW@WRWoWpWqWbecauseAWTW greenish-gray_WvWzWWWgreenschistVW_WWW&W'W(W)WGWgreenschist-blueschiW<W@WAWBWCWEWFWgreenschist-faciesWEWFWFWFWFWFWFWFWFWFWFWFWW)W)W)W)W)W)W)W)WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W0WhadGWhardPWoWpWqWharzburgiticWWWWWW W!W"W#W$W%W&WhasVW@WAWHWIWJWTW[WeWfWgWWW(W)W*W+W,W/W5WhauterivianaW W WhaveMWNWkWW@WBWGWdWW W WWWWWWWWWW W!W"W#W$W%W&W:WbleastWW-W.WEWFWlense-likeWWlenses_WeWlenticularUW\WfWW WlessSWuWWWWWlesserUWsWW WW<W@WAWBWCWCWCWCWCWCWCWCWCWCWCWCWCW6W6W4W5WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlesserBWUWOWpWWWWW WWWWWWWW W W#W$W%W&WXWlgaWWlgrWWliberty-W.WlightKWSW\WuWvWwWPWRWWWW W1W<WhWiWWWWWWWWWWlightandmedium-graytosilverygrayphylliteslatesiliceoVlightgraymassiveorthinlylaminatedquartziteandmediumVlighttodark-grayfinetomedium-grainedmassivetopoorly1V'dikesoWsWvWkWuWWW[WzWWWWWWW W!W"W0W7WJWdinoflagellatesnWdiorite|WDW_WsWuWWW'W^WzWWWDWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW#WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWdisconformablyWWWdisconformitiesWdiscontinuousWWWWWW W!W"W#W$W%W&W1WVWxWdiscordantWWWWWWWWWW W!W"W#W$W%W&W'WdiscussedWWdishnaaWdismemberedPWUWMmassiveWWXWYW_WoWWWWWWWWW'W'W9W9W9W9W9W9W9Wivebasaltflowsagglomeratetufffine-grainedvolcaniclVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWqWmcgrathAWTW^WfWpWqWRWSWmchughkWWmckinley^W_WhWlWuWvWwWmclearn\WmeanoWpWqWmedfraoWuWvWwWxWyWRWSWXWYWaWmediumSWAWOWRWSW]W_WWWWWmedium-beddedfWgWmedium-darkSWmedium-dark-grayAWPWSW_Wmedium-dark-olive-grSWmedium-grainedHWnW}WGWPWSW_WfWgWWWWWWmedium-grayKW\WaWRW]W_WWWWWmedium-olive-grayPWmedium-scale_WmegafossilsfWgWmelangeWdWeWfWgWWmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WmemberKWmembersKWMWNWmeta-andesiteHWIWJWW$roots[WW W!W"WW"W"W"W"W"W"WW!W"W"W"W"W"W"W"W"W"W"W"W"W"WWWroofWrootUWroots[WW W!W"W"W"W"W"WoofWWWrootWUWUWWWWWWroofWWWrootWUWUWWUWWWWWWWroofWWWrootWUWWextrusiveUWWWWW WfWWWWfabricWW1WDWfacies]WVW_WWWW)WGWfairbanksuWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW7W8W9W:WZW_WaWWWWWWWWWWW3-largely`WkWuWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWelyandesiticanddaciticcrystal-lithictuffandlithicnVlargelydaciteandesiteandbasaltandsubordinateandesiticiVjVkVlVmVlargelygraniticbutrangefromtourmaline-bearinggranitetrVsVtVuVvVwVxVyVzV{V|V}V~Vlargelyshallow-marineclasticrocksrangingfromshaleandVlarger WlateAWVWWBWOWVWWWbWeWfWgWW W WWWWWWWWWW W!W"W#W$W%W&W0W2W3W4W7W8W9W:W=W>W?W@WAWBWCWJWKWLWPWkWlWmWnWoWqWrWtWuWxWWWWWWWWtokatjikhvWtolovanaWtonalitesWyW~W'WWWWWWJWtongue\WtooyWWtopXWWWtopographicWtops_Wtourmaline-bearinguWtozitnaMWAWWWZW^W^W^WWZW^W^W^W^W^W^W^W^W_WtrabnWabnWnWnWnWnWnWnWnWnWnWnWmWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWWnW#W$W%W&WtrdvNWtriassicWBWdWeWfWgW WWWWWWW W!W"W#W$W%W&W-W.W2W3W4W7W8W9W:W;W=W>W?W@WAWBWCWJWKWLWNWOWRWSWTWVWXW_WkWlWtrmbVWZWtrmcdWeWfWtrmicacWhWiWtrmq_WtrmraYWtrmrbYWtrmrgXWtrmrlYWtrmrsYWtrmruWWtrmrvXWtrmscWtrn5WGWHWIWtrondhjemiteW'WtrondjemiteWWinterpretedXW]W`WEWZWWWWWWinterrelatedW0WinterspersedWWIWinterstitialWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW5W;WJWMWbWjWvWwWWWWWWintricatelyeWintroduced4WintrudeWWWWWW W!W"W#W$W%W&WintrudedAWVW-W.WWWWintrudesWWWWWW W!W"W#W$W%W&WWWWWintruding'Wintrusion@WWWWWWW W!W"W#W$W%W&W/WEWWintrusionsoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~W1WWWWWWWintrusiveGW[W`WbWeWyW{WNWWW_WWXWvWwWWWWWWWWWiron-oxideAWiron-stainedPW_Wirregular-shaped_WravenAWrbWrecalculatedXWrecentWrecentlyWrecognizedWWrecoveredWrecrystallizedbWWWWWredWreddish-brownvWredefineseWredepositedVW)WreedDWzWWWWWWWWWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW#WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWXWrelativeWWbWVsectionWsectionsWWsedimentary\WyWAWRWSW`WkWWWXWYWWW WWsedimentsWWIWseeWWselawikMWVWWWWWWWW,WIWsemischistVWseparatedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWserpentinizedultramaficrockalteredbaslatgreenandmaroohVsethkoknaoWseveralkWfWgWWshadesSWshaktolikTWshaleAWKWMWNWPWSWVW\WpWqWAWOWPWQWRWSWTWUWZW[W\W_WeWWWWWWWWWWWW-Wshallow[WQWSWTWbWshallowwatermarinesequenceofthinlybeddedcalcareoussabVshallow-marineeWWWWchieflymassivelybeddedlightgraytotandolomiticandcal+VchieflypeliticandquartzosemetasedimentaryrocksofgreenVGVchieflysiltandveryfinesandincludingthickdepositsofCVVVVfinesandincludingthickdepositsofCVVVVVveryfinesandincludingthickdepositsofCVVVVVVVVeryfinesandincludingthickdepositsofCVVVVVVveryfinesandincludingthickdepositsofCVVVVVVVveryfinesandincludingthickdepositsofCVVVVVveryfinesandincludingthickdepositsofCVVVVVveryfinesandincludingthickdepositsofCVVVVVcobbleAWHWPWYWXWYWcobble-conglomeratecWcobble-sizedWWcobbles_WcoevalVWQWcollectedBWcolluvialCWcolor\WcolorsWWcolumnar]WcommentTWcommon\WkW_W`WcommonlySW]Wcommun[W^W_WcWhWuWvWwWTWZW]W^W`WcWoWlationHWIWJW9buchiaoWWWWbuffWbuildupsWWWWWWWWWWWWWWWWWWWcbundtzen@by@ca@cambrian@carbonate@chapman@rchertVqchert-pebble@`chieflykchieflycrystalandlithictuffsandvolcanicgraywackeinte@chieflymassivelybeddedlightgraytotandolomiticandcal@chlorite@cited@coarse-grained@$collection@comparisons@complex@comprises@7conglomeratic@conodonts@consistsoflightgraytopinkrhyoliticvolcanicrocksand@contacts@yoliticvolcanicrocksand@contacts@graytopinkrhyoliticvolcanicrocksand@contacts@icvolcanicrocksand@contacts@hyoliticvolcanicrocksand@contacts@cross-bedded@cross-stratified@cumulate@zdarkplatylimestoneandlimyshaleisthemiddlethirdoft@Xdark-grayargillitedark-graytogreenish-graybeddedchert@date@Udeformed@described@different@dike@TsheetWsheet-likeWsheetsWshelfWWshellWshelledWshellyoWshonkiniteWshortDWshoshoniticWshowBWWshownuWZWWWWIWshungakVWshungnakWWWIWsideMWsignificantWsilberlingWWsilbermanWsiliceousWWvWWWWW8W8W8W8WW8W8W8W8W8W8W8W8W8W8W8W8W8W5W8W8W8W8W8W8W8WW8W8W8W9WW5W5W*W5W5W5W5W5W*WWW%W*W*W*W*W*W*W*W*W*W*W%W*W*W*W*W*W*W%W*W*WW%W*W*W%WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W7W8W9W^WWWWWWWWW_WskolaiWWdweZWweaklyVWW)WweatheringWWweberAW_WWWWXWYWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWdeveloped@Wwell-exposedWwell-foliated-W.Wwell-induratedQWRWWwell-induratedthinly-beddeddark-grayfossiliferousshallowQVwell-rounded_Wwell-sortedLWWWWwereTWdWeWfWgWiWjWkWlWmW W WW6W7W8W9WKWLWdWeWfWgWuWWwerhliteXWwest|W@WGW`WWwesternmWzWWWWKWLW^W_W`WdWeWfWkWlWmWnWoWpWrWWWWWWWubedding`WW1WbedrockBWbedsUWXW]W_WWWW`WfWWWWW W W WWKWLWbeen'W[WvWWWWWW W!W"WbeginningWbeingBWbelavWWbelemnitesaWbelieveZWbelieved[WW W!W"WbelongingyWWWbelowMWbelt\WWWWbeltsWWbelowMWbelt\WWWWbeltsWWsWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbest(W)W*W+W,WkWlWmWnWWWWyWaboulderWWWboumaXWboundedWWbrabbWbrachiopodWWWbrachiopodsYWWWbrackish-waterUWW Wbreccia\WvWYWoWbWWWWWWWbrecciasoWWWWbroadWWEWFWbrooksWWWWIWbrosgeXWYWbryozoancW2Wbryozoans`Wyozoans`W`Ws`W`W`W`W`W`W`W`W`W`W`W`W`W`W`W`Wozoans`W`WlcareoussiltstbryozoancWW2Wbryozoans`W`W`W`W`W`W`W`WWWWWWWWWWWWWWWWWWWWWWoansWWWWWWWWWbryozoansWWWWWWWWWWWWWWWWnsWWWWWzoansWWansWWWWansWWWWWWWansWWWWbryozoansWWoansWWWansWWWWWZofBWCWEWFWMW\W]W^WcWlWoWsWvWxWyWAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWzWzWzWzWzWzWzWzWzWzWzWzWzWzW~W~W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW interbeddedSWUWVWWW\W]WnWoWWWWVWbWcWfWWWWWWWWWW WWWWW)W+W2W<W@WAWBWCWinterbedsoWVW`WeWWWWWintercalated`WW'W'W8W8W8W8W8W8W8W8W8W8W8W8W8W8W*W*W*W*W*W*W*W*W*W*W*W*W*W*W*WWWWWWWWWWWWWWWWWWWWWWWWWWWWWW_WWWWWWWWWWWWWrlayeredSWTW_W<WMWinterlayeredblackshaleorslatelightolive-greenish-gray<VinterlayeredlimestoneandamygdaloidalbasaltflowslimestoMVinterlayeredsiltstoneshalesandstoneandconglomerateorig_Vintermediate^W_WpWqW]W^WintermixeddWeWPWintermixingdWinternal@WWinternally_WKWLWinterpretGW0WinterpretationAWYconodontseWWWWWWWWWconsist\W\W_W6W[WWW W!W"WconsistingFW W[WWWWWW W!W"WconsistsvWWW]WkWsW'WWWWWWWWWWWWWIWconsistschieflyofhornblendesyenitebiotite-hornblendemosVsVendemosVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVdemosVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVblendemosVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVsVeVVVVVVVurrocksuitesintenselydeformedandintricateVVVVVVVVVVVVVVVVVVVcrocksrangingfromgranitetoquartzdiVHpamcYWeWparabolicWWparagastroplites_WpartFWMWcWvWyWVWXWYW\WkWoWWW'W6WVWWWZW_WeWWWWWWWWWWW W WWWWW&W)W,W-W.W0W<W@WAWBWCWEWFWKWLWpartiallyWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW8W9WpebbleAWHWYWRWSWTWWWXWYW[WcWW WWWpebblesWJWpebblyAWMWNWYWaWWWpelecypodW7W8W9WpeliteWWpelitic@WWWWWpeninsulaWWW4Wpennsylvanian0WconsistsoflightgraytopinkrhyoliticvolcanicrocksandvVconsistsofmassivepoorlystratifiedandpoorlysortedcongWVconsolidatedMWconstantsXWconstrainedWconstraintWcontactAWkWEWW0WEWFWFWFWW0W0W0WWW0W0W0W0WonstraintWcontactAWkWEWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWcontainAWTWUWOWeWWWWW5WRWSWTWWWWWWWWWcontainingAWRWVWOWPWQWRWVW`WcWoWpWqWWWWWWWWWWWW W!W"W#W$W%W&W7W8W9W:WhWiWtWWWWWWWWWWWWWWWWWWWWWWWWWWWWWcontainsoW@WXWYW[W]W`WW:WJWMWoWpWuWWWWWW'comparisons^WcompellingWcompilationWWWcompiledWWcompiledWWWWWmpiledWWWpiledWW*finetocoarse-grainedsandgreatkobukandlittlekobuksanVfinetocoarse-grainedsandstonelimysandstonesandylimestVfinetocoarse-grainedthinlycross-beddedsandstoneandquaSVfinetomedium-grainedcommonlycalcareousgraywackeandgracV2Vfinetomedium-grainedmetagraywackeandmetasiltstonecompoVfine-grained^WlWxWUWXW\W]W_W`WoWvWVW_WWWWWWWWW W W WWWWW)W1WKWLWfine-grainedamygdaloidalspiliticpillowbasaltflowsandmvVfine-grainedequigranulartosparselyporphyriticgranitechlVfine-grainedporphyriticrhyolitecomposedofphenocrystsof^Vfphenocrystsof^Vf^VW=W>W?W@WAWBWCWDWFWJWMWkWlWmWnWtWWWWWWWWWWWfluteRWWfluvatileHWOWfluvialCWpWfluviatileAWRWTWUWVW[WOWfluviatileandalluvialfeldspathicandbiotiticsandstonecVV(fork-upper@formsfossil@frasnian@further@gabbroic@garnetiferous@glaciolacustrine@gradational@garnet-amphibolite@glacier@qdepositsincludesunsortedtopoorlysortedti@qsh-gray@greenstone@greenstoneandtufffirstdescribedbypaigeandknopf1907@ had@.hauterivian@having@healy@herein@hills@however@hurst@|hypabyssal@in@|inches@includes@includesrocksinthehealymountmckinleyandtalkeetnaqua@includesthewrangelllavaconsistingchieflyofbasaltand@indecision@W?W@WAWBWCWGWHWIWQWRWSWTWUWVW_WgWyWzW{W|W}W~WWWWWWW1979cWpWqWdWeWfWtW1980^WhWiWjWlWmWoWuWvWwWxWWRWSWXWYWaWcW W WWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W0W6WbWdWeWfWhWiWkWlWmWnWpWtWuWyWzW{W|W}W~WWWWWWWWWW;hereinWWWhighUWXWW WWWWWhigh-levelWhigh-leveldepositsofquartzpebblegraveloverliesbasaltVhigh-pressureVWW)WEWFWhigh-silicaWhigherBWhighly]WoW[WvWWWWWWW W!W"WIWhillAWWWWWWWWWWWWWWWWWWWrWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW0WDWFWUW[W\W]Whornblende-bearingUWhornblende-clinopyroDWFWhornblende-plagioclaEWFWhornblende-pyroxeneWWWWWW W!W"W#W$W%W&WhornblenditeWWhornfelsoWpWqWhostsqWhoweverRW[WgWkW@WOWeW WWWW0W4W6WZWbWdWeWfWhughes`WnWhurstaWhydrothermallyiWjWkWlWmWolduW[W_WWWW W WWW W!W"W-W.W<W@WAWBWCWEWFWHWKWLWFWWWWWW WWWWWWWWWWWWWWWoligoceneAWHWKWPWoliveWWolive-grayAW[WWolive-greenUWolive-greenfinetocoarse-grainedcross-beddedquartzosesaUVolive-greenish-gray<WoliverWolivineFW]WMWWWWWWW W!W"W#W$W%W&WomWomphaciteWWonLWPWTWVWZWdWgWoWHWIWJWQW\W]W_W`WbWcWdWfWgWiWjWkWlWmWoWpWqWWW WWWWWWWWWWW W!W"W#W$W%W&W/W0W4WEWJWWWXWZW[W\W]W^W_WaWdWeWfWkWlWmWnWuWxWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWu-shapedWu/pbWWWWW7WDWultramaficWWWWXWZW'WunalakleetMWoWyWWWuncertain[WW W!W"W1WDWunconformably'WW'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'WNWNWNWNWNWNWNWNWNWNWunconformityWconformityWWWWWWWWWWWWWWWWWunconsolidatedsiltsandandgraveloffluvialglacialcolluVlacialcolluCVVuCVuCVuCV ashMWash-fallVWpWashyVWassemblageAWWWZW^W_WeWWW&W0W<W@WAWBWCWassemblages<W@WAWBWCWassignedcWWWWWWW2Wassignment`W^Wassociated\WvWWWXWYWZWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbasalttorhyoliteflowspyroclasticdepositslahardepositsDVEVKVLVbasalticTWWW[WaWpWqWxWyWiWjWkWlWmWoWpWqWOWVWZWbasalticandesiticandrhyoliticflowstuffandbrecciaandpVqVandesiteFWpWsWxWyWkWoWWWWWWWWWJWandesiteandbasaltlavaflowsandvolcaniclasticrockstkapVpVpVpVpVpVpVpVpVpVpVVpVpVpVpVpVpVpVkapVpVmetagabbroWWWmetagraywackeVWWWWWW1WmetamorphicAWSWUWXW`WEWVWWWZW[WWWWWW WW W!W"W)W-W.W1W<W@WAWBWCWEWFWGWFWGWGWGWGWGWGWCW1W1W1W1W1W1W1W1W"W"W"W"W"W"WW!W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W W W W W'+displayXWWdisplayingWdissectedWdistinctWdistinctionkWdistinctiveWWdistinctivemarkerbedoflimemudstonewithinchertunitloVdistinctlyXWdistinguishedWWEWFWdistributed]WkWuW]WkWuWuWuWdistrictWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W WWWWWWWWeastcW@WGWTW_W W WWWWeasternOWbWWWWWWWW=with^WoWvWAWSWUWVWWWYW]W_W`WnWoWuWVWXW_W`WbWcWvWWWWWWWWWWWWWWWWWWW W W WWW&W'W)W-W.W0W1W2W7W<W@WAWBWCWDWEWFWIWKWLWFWFWFWFWFWFWFWFWFWFWFWFWFWFW7W2W2W2W1W1W1W1W1W1W1W1W1W.WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W1WJW_WhWiWtWuWWWWWWWWWWWwithinmapareaconsistsofpoorlydescribedmetasedimentaryVVVwithoutWWmetadiabaseWmetadiorite0W0WometabasiteWWWGWmetabasitemzzmaandfelsicschistdfundividedVmetachertYW_WWmetadiabaseWWaseWWWWWWWWWWWWWWWWWWWWWWWdiabaseWWWdiabaseWWWWWWzcrossbeddedUW\WW WcrossbeddingWcrosshatchuWcrustsEWcrystal`WnWpWbWcrystallinesWWWWWJWcrystallizationWWWWWWW7WDWGWcrystalsnWoWWcs-W.W0WcsejteyvWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWcsvIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWWIWIWIWIWIWIWIWsvGWHWIWIWIWWWWWWWWWIWWWWWWWWHWIWWWinedhornblendeandpyroxene-nVdark-grayAWOWQWRWTWUWWW[W\W]W^W_W`WaWeWWWW W WWWW1W6W massivegreenstonetothinlylayeredgreenschistbodiesthat'VmassivepoorlystratifiedpebbletoboulderconglomerateintVmassively&W+WmaterialWmatrixRWSWVWWW]WoWbWWWWW WWWmatrix-supportedXWbWWWW WWWmatrix-supportedXWXWoWbWWWW WWWmatrix-supportedXWXWXWXWx-supportedXWXWXWXWatrix-supportedXWXWWWWW WWWmatrix-supportedXWXWXWXWXW Wmatrix-supportedXWWmatsumoto W Wum-grainedHWnW}WGWPWSW_WfWgWWWWWWWWWmedium-grayKW\WaWRW]W_WWWWWWWWmedium-lightWWWmedium-olive-grayPWmedium-scale_WmegafossilsfWgWmelangeWdWeWfWgWWmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WmemberKWmembersKWMWNWmeta-andesiteHWIWJW\ andWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW#bigvWWWbimodal&W&W&W&W&W&W&W&W&W&W&W&W&WbiogenicWogenicWWWWWWWWWWWWWWWWWWWWWWWWWWWbearingfWbiotite-bearingperalkalinealkali-feldspargraniteandbiotfVbiotite-hornblendegWhWiWjWmW{Wbiotite-muscovitelWbiotite-plagioclasefWbiotiticVWbioturbationPWbituminousSWUW[Wblack]W_WeWWWW WWW7W8W9W<WOWkWlWmWnWxWblastomylonitic@W0WVWblocksWdWeWfWgWWPWVWblodgettuWblueschistdW-W.Wbodies[WeWkWmWyWzW|WW@WWWWWW1W4WEWkWlWmWnWtWuWbodyeWWWWWWW W!W"W#W$W%W&WbordereWkWWWWWWWW W!W"W#W$W%W&W-W.Wboss-W.WbothMWNW[W^WeW W7W8W9WuWXUdark-greenishWWdark-greenish-gray`WWdark-greenish-graymaficvolcanicrocksandinterbedsofblaVdark-olive-gray_Wdata\WcWUWWWWvWWW W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0W0WW W0W0W0W0W0W0W0W0W WWWWWWWWWWWWW W W WWWW W WWWW W W W W W W W W W W W W W W W WWWWWWWWWWWWW W WW W W W W W W WWWWWWWWWWWWW W W W W W W W W W WWWWWWWWWWWWW W W WisUW[W`W7W8W9WhWiWtWWWWWdeckerRWdeepQWKWLWpWtWuWdeep-marineWWdeep-wateruWdefinedbWlWBW W5Wdeformation7W8W9WwamountsUWVWWWXWsWWWW WWWWW<W@WAWBWCWamphibole'WeWamphibolesWWWWWWWWWWW'W/W0W7W8W9WWWWWWWWWWWWWWWWWWWWWWWWamphiboliticWamygdaloidalMWRWSWTWYWamygdulesMWanAWmW@WHWIWJWOWQW[WaWdWhWWWWWWWWW W!W"W#W$W%W&W-W.W0W2W3W4WEWMWZWhWiWWWWWWWWWWWWWWWWWWWWWanalogy-W.WanalysesOWanalysisEWFWanchoragePWWW[W^W_WfWgWhWkWWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W-W.W/WWWWWWWWWWWmtypesWWtypicalXWtypicallyBW]W_WoWuW[WvWWWWW W!W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWmay_WXWZW[W_WvWWWWWW W WWW W!W"W&W-W.WDWEWFWHWKWLWmcZWmccannWWWWWWWWWWnWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmedium-beddedfWgWmedium-darkSWmedium-dark-grayAWPWSW_Wmedium-dark-olive-grSWmedium-grainedHWnW}WGWPWSW_WfWgWWWWWWWWWWWWWWW W!W"W#W$W%W&Wmedium-grayKW\WaWRW]W_WWWWWWWWmedium-lightWWWmedium-olive-grayPWmedium-scale_WmegafossilsfWgWWmelangeWdWeWfWgWWmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WmemberKWmembersKWMWNWWmeta-andesiteHWIWJWmeta-areniteWWzslateAWVWeWWWWW)WslatyeWW W WWKWLWsleetmutevWslicesW&WslightDWslightlybWsliversAWsmallEWMW\WyWuWWWbWWWWWGWsmall-scale_WsmallerWW6W6Wy6W6W6W6W6W6W6WW6W6W6Wy6W6W6W6W6W6W6WhWWWWWWWsmoothWsnady6W6W6W6W6W6W6W6W6W6W6W6W6WWWhWWWsmoothWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWthWWWoothWWWWWWWWWWWWWWWWWWWWWWWWWWWthWWWWWWWWWWWWWWWhWWWkWBWOW]W^W`WW-W.W0WKWLWjWWWWWWWWWu3QprimarilyZWprimaryDWprismsWprobable\W6WW&W7Wprobably^WYWWWWWW W WWWWW'W0W1WKWLWprodelta]WproglacialWWIWprogradedUWW WprogradingSWprogressiveVWprominentWWIWproportionsUWVWW W)WW W)W)W)WW W)W)W)WW W W W W W W W W W W W W W W W WW W W WogressiveVWprominentWWproportionsUWW W WWW W W W W WW W W W W W W W WW W W W WWrozoicWWWWWWWWWprotolithAWEWFWGWWW-W.WWWWWWWWWWWWWWWWWprotolithsdWWW-W.WprovenanceUWW WprovideWWWprovidedpWprovisionally_Wproximity(W)W*W+W,WWWWWWymapsWmarbleAWWWWWWWWW+W0WGWmarginUWWWW WIWmarineRWSWUWWWXW\W]WaWoW6WWW W WWWmarked]WmarkerWmarks]WW1WmaroonWmassesWWWgrayblackandvariegatedchertandsiliceomassesWWWWWWWWWWWWWWWWWWWWmassesWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW5W5W5W5W5W5W5W5W5WW5W5W5W5W5W5W5W5W5WWmartin4WmassWmassesWWWW5W5W5W5W5W5WW5WWC planar_WplantoWSWUWVW]WWW WWWWWWplateau[WW W!W"WplatyWpleistoceneWWIWplioceneMWWWIWplugssWWWWJWpluton'W7Wplutonic W WWKWLWWWplutonismWWWWWWWWWWWWWWWWWWWWWWWWWWWismWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W WWplutonismWWWWWWWWWWWWWWW'WVWWWWWWWWWWWWWWWWWpmijWpodiformPWpogibshi4WpollenoWpolymetamorphicWWWWWWWpolymicteWWpolymicticAWUWOWSW_W WWWpolynathiformis7W8W9WpoorWWWWWWVcambrianWWWcampanianWcanWcanadaWcappingZWcarbonaceousVWvWW W WWWWKWLWWWWWW3WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWiltstoneshaleandclaystonelocallyKVcarbonateaWfWgW5W7W8W9W=W>W?W@WAWBWCWVWtWWWcarbonaterocksthatoverliethenikolaigreenstoneunittrn5Vcarbonate-dominatedWWcarbonate-platformpWcarbonatite_WcarboniferousOWcarbonizedTWcarden-W.WcaribouWcarryingVWcarterWcascadenWWcasspWqWuWvWwWZWdWeWfWgWWWcastleWcastsPWWcataclasticWWWWcataclastiteWcdeWcenterbWcenters[WcentimetersWcentralDWEWeWKWLWWWWWcephalopodsaWcf7W8W9WWWRincipientlyYWinclude\WvWXWZW_WvWWWWW&W4WincludedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWtWuWvWwWxWyWzW{W|W}W~WWWWW WWWWWW(W)W*W+W,W-W.W0WRWSWTWUWVWWWXWYWaWdWeWfWhWiWkWlWmWnWpWrWtWuWWWWWWWincludesanumberofdifferentunitsmappedinvariousareasAVincludesawidevarietyofgraniticrocksexposedthroughoutgVincludesjurassicphaseofthealaska-aleutianrangebatholi(V)V*V+V,V8kjvrWWWkjwc WkmcVWkms]WknowneWknsyWkobukWkoyukukCW[WWWWWWWWWW W!W"WkqcWWkrdvWks\WkssSW W WWKWLWksyWWEWFWkuskokwimkWkvnWvW'WWkveYWkvgWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWkvgWWWWWnWmnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWWnWnWnWnWnWnWnWnWnWWnWnWWnWnWWWWnWWWnWWWnWWnWadjacentWWWWWWWWWWWWWWWWWfurtherZWWWIWgabbro|WDWWW'WVWXWZW[W^WbWzWWWWW W!W"W)WDWgabbrodioriteserpentiniteandmaficvolcaniclasticrocksrVVgabbrosillsandsubordinatequartzdioritequartzmonzonite^V^V^V^VV^V^Vzonite^V^V^Vonite^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^VV^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^V^VVV^VWWWgemukBWgemutsWWgeneralbW WgenerallyMWNW[W\WkWmW@WoWpWqWW WW5W7W8W9WWWgeologicPWOWgeologyZWgeophysicalAWgeorgecWgilbertcWgivetianfWgWglacialCWglacier@WWJWglaucophaneRWSWTWVWglaucophane-bearingRWSWTWglennWW;Wgneiss@WEWFWgneissicAW.about'WEWaboveWabundanceSWWabundantoWRWUWVWXWYW`WaWnWoWbWfWWWWWWWWWW W WWWWWWW+W1Waccessory[WW W!W"Wactinolite&Wactive[WW W!W"WadjacentaladjacentacentadjacentacentacentacentWadjacentacentacentacentacentacentacentacentacentacentacentacentacentallyadjacentacentadjacentacentcentcentcentcentcentacentcentcentcentcentGWtGWtGWtGWtGWtGWtGWtGWtGWtGWjacentGWtGWtGWtGWWtGWtGWtGWjacentGWtGWtGWtGWtGWtGW W W W W W W WW W WW W WWW W WGWW W W W W W W WSresolveZWrespectivelyWrestrictedWW[WW W!W"WretrogressionWressionWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWrhyoliticGW\WeWpWqWtWuWvWwWNWrhyolitictoandesitedomesdikesswarmsandplugsandotherGVNVrhyoliticvolcanicandminorassociatedsedimentaryrocksar\VrhythmicallyWWWWrhythmicallyinterbeddeddark-graytoblackchertyargilliteVribbonWrich_WridgeUWWWWWWWridges[WZWridgewayOWrip-upWrip-ups_WrippleRWripple-laminated_WriverBWbWcWoWuWvWwWxWOWUWXWYWZW[W_WoWpWqWWWWW WWW-W.W0W;W=W>W?W@WAWBWCWaWjWWWWWWWWWWWWWWWWWWWWWWWWcrossXWWWWWWWWWWwmscontrolWWWconvoluteWcoolingEW]W^WlWxWyW{W|WVWoWpWsW~W'W[W_WWWWWWWWWWWWWWWW W!W"W-W.W0W<W@WAWBWCWEWFWGWcoquina-likeWWWcoralWWcoralsWWcored'Wcorner_WWcorrelate_WWWWWWWelatedWatedWWWatedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlativeAWSW@WUWWWWWWWWW-W.W/W5W6W=W>W?W@WAWBWCWaWWWWWWcorrespondingtWcorrespondseW/WGWHWIWQWYWZW[W\W]W^W_W`WcWdWeWfWcottacWtWWWcottonwood=W>W?W@WAWBWCWWH.€A5285A Metamorphosed mafic igneous rocks, ranging from metagabbro and metadiabase to greenstone, amphibolite, and garnet amphibolite. Variable intensity of sheared within unit. Unit Pzm of Dover (unpublished mapping, 1997), not mapped separately by Chapman and others (1982) CPzrmi~)greatWgreateruWgreenW9W9WgreenishWWWWWWhlorite-carbschistcommonlyhavingabundantpgreenishWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWH$€AFine- to medium-grained metagraywacke and metasiltstone composed chiefly of quartz and chert clasts, but in places containing a significant component of volcanic rock and feldspar clasts. Overprinted by low-grade penetrative metamorphic fabric, but turbidite features, such as graded bedding and sole marks, are locally discernible. Interbedded with subordinate amounts of phylliteCPzgD Paleozoic?E&Metagraywacke and subordinate phylliteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A5340ac^€ADark phyllite and minor metagraywacke that have a penetrative fabric ranging from slaty cleavage to weakly schistose. Unit locally contains slices of little deformed shallow-water Devonian carbonate rocks that are enveloped in basalt flows and debris-flow(?) breccias composed of blocks of vesicular basalt in a matrix of volcanic and carbonate debris. Age of unit is probably middle or late Paleozoic. Correlative with |pr unit in the Ruby terrane CPzpaD Paleozoic?E&Phyllite and subordinate metagraywackeA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4btroublesomeWtroughWWtrough-crossbeds_Wtroughs_WtrpbWtrpvWWtrscvWtubesYWtuff\WvWVW`WkWoWVWZWbWeWWWW)WtuffandbrecciaarecomposedofabundantlithicfragmentsoVtuffaceousXWpWvWWWWtuffaceous-richXWtuffsoWnWoWpWvWWWWWWW'Wturbidite`WWW1Wturbiditic]W`WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW[WtwffWtwgfWtwoKWkWHWIWJWeWfWgWiWjWkWlWmW W WWWW5WEWdWeWfWgWvWwWWWWWWWWW€A6956ALight- to medium-green chloritic schist, light- to medium-gray with silvery sheen phyllite, light- to medium-gray and greenish-gray, sandy in part, largely recrystallized limestone, and light- to medium-green greenstone. Schist and phyllite are partly calcareous, intensely folded and interbedded with thin limestone beds. Greenstone is basaltic, less common than other rock types. Unfossiliferous; probably older than the adjacent Frasnian limestone (unit DSl). Mapped only in the western  F<AQuartz-mica schist and lesser amounts of calc schist, quartzite, graphitic schist, chlorite schist, and quarto-feldspathic schist. Polydeformed greenschist-blueschist-facies characterized by quartz-muscovite-chlorite-albiteglaucophane assemblages. A relict epidote-amphibolite metamorphic assemblage suggests that, at locally, the unit underwent a pre-mid Devonian metamorphic event. Unit is interbedded with carbonate rocks of unit |ca and therefore is, in part, Paleozoic in age. HoweveBr, in the Baird Mountains quadrangle, unit is intruded by Proterozoic granitic rocks of unit PzZi, and therefore is locally as old as Proterozoic. K/Ar isotopic analyses of the schist yielded Early Cretaceous metamorphic mineral cooling ages CPzZsaDPaleozoic and ProterozoicE*Pelitic schist, calc schist, and quartziteOQthin-bedded\WWWWWthinlyRWSWWW W&W'W'W'W9W9W9W9Winterbeddeddark-grayargilliteandVVVVallyinterbeddeddark-grayargilliteandVVVVVVVVthinlybeddedmediumtodark-graylocallycalcareousphyllit;V;V;V;V;V;Vyllit;V;V;V;VWW W!W"W#W$W%W&W-W.W7W8W9W:WtholeiiticWWZWtholeiiticpillowbasaltpillowbrecciaandminoraquagenetZVthoseGWiWjWkWlWmWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~W WthoughWWWWWW W!W"W#W$W%W&Wthought@WEWFWPWWWWWW/W0WthreeMWNW W WWthroughgWdWWWWW(W)W*W+W,WthroughoutAWBW[WgWrWsWWWWWWW W!W"W#W$W%W&WthrustEWFWHWIWJWW W WWthrustingZWWti^WounitedCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWwCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6W€A8700ABanded, fine-grained, foliated, felsic volcanic rocks. Chiefly porphyry composed of large phenocrysts of embayed quartz and plagioclase in a very fine-grained quartzo-feldspathic groundmass that has a distinct micaceous overprint. Subordinate fine-grained quartzo-feldspathic rocks which probably represent recrystallized felsic flows and tuffs. Zircon fractions from two samples of a foliated quartz porphyry flow give a crystallization age of approximately 850 Ma CZvDLate ProterozoicEMetavolcanic rocksass that has a distinct micaceous overprint. Subordinate fine-grained quartzo-feldspathic rocks which probably represent recrystallized felsic flows and tuffs. Zircon fractions from two samples of a foliated quartz porphyry flow give a crystallization age of approximately 850 Ma CZvDLate ProterozoicEMetavolcanic rocksshallow-waterVWeWWWWW)Wshallow-waterdepositsconsistingofseveralrepeatedcyclesVshalyWWWshardsWsharpWshearedWW_WWWWshearedmetamorphosedporphyriticquartzdioritecontainsbiVsheenWtectonicallyintermixedwithchertandsheenWWWWWWWWnWWWWW)NBA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4CA8602AQuartz-mica schist and lesser amounts of calc schist, quartzite, graphitic schist, chlorite schist, and quarto-feldspathic schist. Polydeformed greenschist-blueschist-facies characterized by quartz-muscovite-chlorite-albiteglaucophane assemblages. A relict epidote-amphibolite metamorphic assemblage suggests that, at locally, the unit underwent a pre-mid Devonian metamorphic event. Unit is interbedded with carbonate rocks of unit |ca and therefore is, in part, Paleozoic in age. Howeve€whereasuWwhich^WyWSWkWcWWWWWWWW2Wwhite\WVWWWWWWWWwhiteface9Wglight-graymedium-beddedandcross-beddedqwhiteface9W9WVwhiteface9W9W9Wht-graymedium-beddedandcross-beddedqVwhiteface9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9Weface9W9W9W9WWWWWWWWWWWWWWWWWWWWWWWWWWWdWWWWWWWWWWWWWWWW$W%W&WwidelyLW_WkWlWrWsWtW{WRWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W=W>W?W@WAWBWCWwidelydistributedandexposedgraniticintrusiverockschie{Vwidelydistributedbiotite-muscovitegranitetoquartzmonzolV\VmudstoneMWVWWWXW`WaWnWWWWWWWWWWmullWmulti-grainWWWWWWWWWWWWWWWWWWWWWWWWWzcWWmzpzdyWzW{W|W}W~WmzpzgyWzW{W|W}W~WmzpziyWzW{W|W}W~WmzpzmyWzW{W|W}W~WmzpzpWWmzpzs/WWWWmzpzuWWWWWWmzpzumWWWWWWmzs WWWWmzsaHWIWJW Wmzu WWWWmzvWWWnagao WnaknekbWWWname4WnamedWnarroweWKWLWnationWWnature WxWnearkWGW[WoWpWqW1WKWLWWWWWWWWWWWWnearlyEWFWnecessaryZWnegondolella7W8W9WnelchinabWnelsonhWlWmW W WkWlWmWnWpWtWuWyWzW{W|W}W~WWWWWWWW €A5410^ €A7261PzscDMesozoic? to Proterozoic?E5Metabasite (MzZma) and felsic schist (Df), undivided A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A7261f the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.€A7260CPzscDMesozoic? to Proterozoic?E5Metabasite (MzZma) and felsic schist (Df), undivided A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A7261+' -19981:250000W1:500000BWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWHWHWHWHWHWHWHWHWHWHWHWHWHWHWW#W$W%W*W/W89-551#W$W%W*W/WaCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWWIquadranglesMWoWvWAWVWXWYWuWWWWWWWWZWeWzWWWWWWWWWWIWquailWquarto-feldspathic<W@WAWBWCWquartzMW^WoW|WDWRWSWUWVWWWXW]WaWsWuW~W'W6W^WzWWWWWWWWWWWWW W WWWWWWW1W7WGWquartz-carbonateaW6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6WW6W6W6W6W6W6W6W6W6W6W6WaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWWWWWeUWVW\WaW@having_WeWWhawaiiteDWhayesuWWWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W5W:W=W>W?W@WAWBWCWGWHWIWJWKWLWMWNWOWPWtWuWWWWWWWWWWWWhealycreeksanctuarysuntranalignitecreekandgrubstakefMVNVhemlockKWhenceWWherebWoW@WOWRWTWZWeWoWpWqWWWW7W8W9W_WtWWWWWWWWWWWWWWWWWWWWW(ZeastwardWWechinoid2WechinoidscWedge\WWWW,WIW,W,WWW,W,W,W,WctsWWWWWW€_B contains fossils of Silurian and Devonian age (Dumoulin and others, 1997). In the southeastern part of the Medfra quadrangle the unit is interlayered with mafic igneous rocks that yielded a K/Ar isotopic cooling age of 421 Ma. Unit may include rocks as old as Proterozoic CMzPzqD early Paleozoic and Proterozoic?E2Quartzite, grit, argillite, and quartz-mica schistA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4E^:€'Bt of the pluton has been metasomatized by potassium-rich fluids to a pink granite and granodiorite. In these altered rocks potassium feldspar forms rims on plagioclase grains and occurs as patches or veins replacing plagioclase. The pluton locally has been cataclastically deformed. Unit is unconformably overlain by andesitic volcaniclastic rocks of unit Kv. K/Ar isotopic cooling ages range from 173 to 130 Ma CJgtDLate and Middle JurassicETrondhjemite and tonaliteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 suggestsW<W@WAWBWCWsuite[WWW W!W"WsuluknavWsurroundedWsurroundingBWsyenitesWWWWsystemAWtzWWtacWWWWWWcWWWWWWWWWWWWWWWWWWWWWWtalcWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWanAWKW\WkWlWmWnWtanacrossQWtanana\WlWuWvWwWAWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWW WWW<WEWUWVWWWXWYW`WvWwWWWWFcoarse-grained{W|WSWUWYW\W]WaWvWwWWW_WbWWWWW WWWWWWWcoarselysWWWWWJWcoarser-grainedWcoastMWcoastalSWcoatedWcoatingsWcobbleYWWWWcobble-sizeWWcobbles_WWcollectedeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWcombinedWWcominco WcommentTWcommon\WkW_W`WWWWcommonlySW]W7W8W9W=W>W?W@WAWBWCWWWWWcommun[W^W_WcWhWuWvWwWTWZW]W^W`WcWoWpWqW WW-W.W0W=W>W?W@WAWBWCWUWVWZW[W\W]W_WtWuWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWPk€ARanges from light gray to white partly recrystallized limestone to coarsely crystalline marble. Dark finely crystalline dolomitic marble. Interbedded calc schist, chloritic schist, and quartzite in subordinate amounts. Unit ranges in age from Ordovician to Mississippian and may locally include rocks as old as Cambrian. Contains scattered fossils, chiefly conodonts, from map area and from exposures of the unit in contiguous parts of the Arctic Alaska terrane north of the map area CPzcaD PaleozoicECarbonate rocksA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4TP€@GAJ€A€@RAv€@VA€AYCW€A:€@aA€@cAe€Agm€@pArEs€@B€AC€@€@A€B€B^€@A€@B@BBB€@B€@BB€@B€@BBB€@BB€@B€@BB€B€AA€B€AAA€AB€A€B€AB€AA€A€A€A€AB€A€AB€AB€AA 3BWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWW63BWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWW98-133BWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWaCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWRWWRWW|WRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRWWRW easternZWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWJ€vA5012ADominantly dark gray, typically phyllitic, siliceous to carbonaceous argillite and shale, with subordinate but characteristic clast-supported chert-rich conglomerate, greenish-gray chert, tuffaceous volcaniclastic rocks, yellowish- to reddish-brown highly calcareous argillite or limestone, and minor intrusive rocks; locally may include older (Mississippian? or Devonian?) or younger (Cretaceous) rocks (Dover, unpublished data, 1997). Mapped in Tanana quadrangle. In Livengood quadrangle, eB@quivalent rocks have been subdivided into two units, Trsc and Ps..  wilsonWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWGWGWGWGWGWGWGWFWFWFWFWCWCWCWCWCWBWBW7W7W7W7W7W7W7W7W7W7W7W7W7W2W2W2W2W2W2W2W2W2W2W2W1W1W1W1W1W1W1W1W1W1W1W0W.W.W.W.W"W"W"W"W"W"W"W#W"W"W{}dividedRW WdocWdolomiteWWWWdolomite-calcite-magEWdolomiticWWWW+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+W+We-magEWdolomiticWWWWWWW+W+W+W+W+W+Walcite-magEWdolomiticWWWWWWWWWWWWWWWWWWWWfWpWvWwWdominantlybasaltgreenstonegabbrodiabaseandchertminorVVdominantlydarkgraytypicallyphylliticsiliceoustocarbonvVwVdominantlyfinetomedium-grainedgarnet-bearingschistandGVdominantlymediumtomedium-dark-graygarnetiferousquartz-mAVdominantlymedium-darktodark-graythin-bandedbeddedradiodVeVfVdominantlymetabasaltslateandotherlow-grademetasedimentGVHVIV1982\WvWWWWWWWW1983WWXWzWWWW1984WW^WeW1985YWWWZWeW1988_WzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzW8_WzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzW~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W}W~W~W~W~W~W~W~W~W~W~W~W~W~WWWWWWWWW~W~W~W~W~W~WWWW=W>W?W@WAW1997[W\W^WcWAWTWL 1andWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWappendixBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWbasinCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\WWW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WWW W W W WWWWW*HwilsonfhdoverjhbradleydcweberfrbundtzentkandBVvVAVDVWVYV_V`VkVuVVVVVV VEVWVXVYVZV^VeVvVzVVVVVVVVVVVVVVVVVVVwisemanWsemanWWVVVVVVVVVVVVVVVVVVVVVVVVVwilsonandothers1998dogmapkarlsmdumoulinjaellersieVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV#VVVVVVVVVVV6ON!A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4"A5190AThe complexes consist of: 1) a cumulate magmatic suite composed of interlayered dunite, wehrlite, olivine clinopyroxenite, and gabbro, 2) a mantle suite composed of harzburgite, dunite, and minor clinopyoxenite, and 3) a metamorphic sole consisting of a highly tectonized layer of amphibolite, garnet amphibolite, and pyroxene granulite. The harzburgite in the mantle suite typically is partly to mostly serpentinized. Chromite is generally restricted to centimeter-scale layers in dunite and zsWzynmWbuczwadcddcsdfdgna7dgnrdspdstdswdtrjdvV)jgt'jmcbjmtruWjmtuZjpztm^jtrtmuXkbdvkcckcgkcs]kcvgkftkgukgckgd~kgrkguwkjmkjwkjwc kmcWkms\kmumknsykqcVkqsakrdpksU kscSksmskssR ksu KLksyktgnkvokvckvgXkvgm`kvlkkvmYkwcf___kwcf_cf_cf_cf__cf_wcf_cf_wcf_cf_cf_cf_cf_wcf__cf__cf__cf_wcf__cf__cf___wcf__wcf__f__cf__cf__cf___mgqmzb#mzg$mziDmzpzizmzpzq_mzpzum[ !"mzzma&mzzmr'mzzms(mzzrc0mzzumococlofcontpadlppamcpdmspzbs*Wpzcapzcs+pzd*Wpzdpzbs*Vpzgpzlslpzpapzpr1pzqms/pzrmႀpzrmipzrpgpzrqs悀炀肀9)becauseWbecomesXWbedWWWWWWWWWWWWWWWQ> digital!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLW:6N A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4!A5150AThe complexes consist of: 1) a cumulate magmatic suite composed of interlayered dunite, wehrlite, olivine clinopyroxenite, and gabbro, 2) a mantle suite composed of harzburgite, dunite, and minor clinopyoxenite, and 3) a metamorphic sole consisting of a highly tectonized layer of amphibolite, garnet amphibolite, and pyroxene granulite. The harzburgite in the mantle suite typically is partly to mostly serpentinized. Chromite is generally restricted to centimeter-scale layers in dunite and iwolverineWWWworkWwormYWwrangellFWwrittenvWZWzWWxenolithsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWsDWxmsoWWWyanertWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWyieldsRWSWTWyoungdWWWrWsWtWuWvWwWxWyWzW{W|W}W~WXWyoungereWyoungest@WGWyukon`Wyukon-koyukukUWyukon-tananaAWzircon@W0WzoneeWdWWWWWWWW W!W"W#W$W%W&W:W:oneEWlWpWsW[WWWW W!W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WW<WJWKWLWNWOWbWdWeWfWgWjWoWtWWWWWWWontWooid-richWWooidsWooliticWophiolitehWPWUWophirpWqWRWSWTWXWYWZWaWcWdWeWfWhWiWoppositeHWIWJWorAWIWfWgWmWW@WAWQWTWiWjWkWlWmWrWsWtWuWvWwWxWyWzW{W|W}W~WW W W WWWWWWWWWWW W!W"W#W$W%W&W-W.W7W8W9W;W<W=W>W?W@WAWBWCWvWwWxWWWWWWWWWWWWWWWWWWWWWWWWWWoralcWZW]W^W`WoWpWqWZWorangeIWWWorangelight-tanorlight-graymassive-beddedcoarseconglomIVorange-brownAWorange-weatheredW3/!Bas an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite. The complexes are believed to form the roots of the Koyukuk volcanic arc that appears to have been active from Jurassic to late Early Cretaceous The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. K/Ar isotopic cooling ages from the magmatic suite average 159 Ma and two 40Ar/39Ar determinations yielded a plateau age of 1C62 Ma. K/Ar isotopic cooling ages from the metamorphic sole at the base of the complexes range from 172 to 155 Ma and one 40Ar /39Ar determination from the metamorphic sole yielded a plateau age of 161 Ma CMzPzumDMesozoic and Paleozoic?EMafic-ultramfic complexes,hBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW;€[Bas an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite. The complexes are believed to form the roots of the Koyukuk volcanic arc that appears to have been active from Jurassic to late Early Cretaceous The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. K/Ar isotopic cooling ages from the magmatic suite average 159 Ma and two 40Ar/39Ar determinations yielded a plateau age of 1C62 Ma. K/Ar isotopic cooling ages from the metamorphic sole at the base of the complexes range from 172 to 155 Ma and one 40Ar /39Ar determination from the metamorphic sole yielded a plateau age of 161 Ma CMzPzumDMesozoic and Paleozoic?EMafic-ultramfic complexes1bases]W_Wbasin\WyWUWW WWWWbasiskWZWWWWbatholithDWbayMW\W`WWWW,W0WbeyWZW[WWWWWW W WWWWWW W!W"W-W.WDWEWFWKWLWFW9W9W9WbeaverWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWerWW=3 Bas an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite. The complexes are believed to form the roots of the Koyukuk volcanic arc that appears to have been active from Jurassic to late Early Cretaceous The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. K/Ar isotopic cooling ages from the magmatic suite average 159 Ma and two 40Ar/39Ar determinations yielded a plateau age of 1C62 Ma. K/Ar isotopic cooling ages from the metamorphic sole at the base of the complexes range from 172 to 155 Ma and one 40Ar /39Ar determination from the metamorphic sole yielded a plateau age of 161 Ma CMzPzumDMesozoic and Paleozoic?EMafic-ultramfic complexes8DQ€[A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4|=Bas an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite. The complexes are believed to form the roots of the Koyukuk volcanic arc that appears to have been active from Jurassic to late Early Cretaceous The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. K/Ar isotopic cooling ages from the magmatic suite average 159 Ma and two 40Ar/39Ar determinations yielded a plateau age of 1C62 Ma. K/Ar isotopic cooling ages from the metamorphic sole at the base of the complexes range from 172 to 155 Ma and one 40Ar /39Ar determination from the metamorphic sole yielded a plateau age of 161 Ma CMzPzumDMesozoic and Paleozoic?EMafic-ultramfic complexes<:NA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 A3498AThe complexes consist of: 1) a cumulate magmatic suite composed of interlayered dunite, wehrlite, olivine clinopyroxenite, and gabbro, 2) a mantle suite composed of harzburgite, dunite, and minor clinopyoxenite, and 3) a metamorphic sole consisting of a highly tectonized layer of amphibolite, garnet amphibolite, and pyroxene granulite. The harzburgite in the mantle suite typically is partly to mostly serpentinized. Chromite is generally restricted to centimeter-scale layers in dunite and 2,doverBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWfBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWUWVWWWWWWWVWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWWVWW]WWWWWWWWWWWWWWWWWWWW W W W WWWWWforCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVW\W50A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.41A5561APhyllite and subordinate fine-grained metagraywacke cut by abundant vein quartz. The phyllite and metagraywacke are overprinted by a low-grade penetrative metamorphic fabric, but turbidite features, such as sole marks and graded bedding, are locally discernible. Age of unit is uncertain, probably Devonian or late Paleozoic. Correlative with unit Pzpa in the Arctic Alaska terraneCPzprD Paleozoic?EPhyllite unit in the Ruby terrane CPzprD Paleozoic?E&Phyllite and subordinate metagraywackeAP€VA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003nrocks\WpWsWvWyWAWUWWWXW]W_W`WkWnWvWwWWWWWW'WVWWWXWYWZW_WbWcWeWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlYapproximatelyvW]WWWaptiannWarc[WW W!W"WarcticVWWWW1WareBWMW\WcWyWSWUWVWXW\W]W_WkWoWuWVWWW[W`WbWcWeWWWWWWWWWWWWWW WWWWWWW W!W"W&W)W0W1W2W2W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W2W2WW2W2W2W2W1W1W0W1W1W1W1W1W)W)WW"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W0W6W:W;WKWLWQWRWSWTWZWaWgWqWtWuWWWWWWWWWWWWWOWkUV4WA2030AConsists of massive poorly stratified and poorly sorted conglomerate composed of pebble- to cobble-size clasts in a graywacke and mudstone matrix. Clasts predominately mafic intrusive and extrusive rocks, varied colored chert, and locally metagraywacke. Limestone, quartz, and granitic rock clasts present in subordinate amounts. Conglomerate is interbedded with mafic- and calcareous-clast graywacke and mudstone. Unit composed chiefly of debris eroded from the Angayucham-Tozitna terraneB . Unit stratigraphically underlies unit Kqc. Contains marine mollusks of Early Cretaceous(?) age in the Selawik quadrangle mCKmcD CretaceousE:Mafic igneous-clast conglomerate, sandstone, and mudstone FWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.;€^A5113AGabbro sills and subordinate quartz diorite, quartz monzonite, and pyroxenite. Undated; age and assignment to the Tozitna assemblage based on lithologic associations and regional comparisons. Corresponds to informal Pzmi unit of Puchner (1984) in western Ruby quadrangleCJPztmDJurassic? and/or Paleozoic?EBTozitna assemblage (south): Mafic and ultramafic rocks, undividedFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.ed to greenschist facies composed of sheared and foliated grit, quartzite, quartz-muscovite schist, and subordinate thin carbonate rocks and metachert. No fossils found in this unit in the Medfra quadrangle, but to the east in the adjoining Mt. McKinley quadrangle itjoining Mt. McKinley quadrangle it"€'A3380ATrondhjemite, tonalite, and subordinate quartz diorite, diorite, and gabbro. Trondhjemite consists of 50 to 60 percent plagioclase, 25 to 45 percent quartz, 4 to 8 percent mafic minerals (chiefly biotite and subordinate amphibole). Tonalite has 50 to 55 percent plagioclase, about 20 percent quartz, 5 to 10 percent biotite, and 15 to 25 percent amphibole. Diorite and gabbro have as much as 30 percent mafic minerals, usually amphibole cored by minor clinopyroxene. Much of the western par has 50 to 55 percent plagioclase, about 20 percent quartz, 5 to 10 percent biotite, and 15 to 25 percent amphibole. Diorite and gabbro have as much as 30 percent mafic minerals, usually amphibole cored by minor clinopyroxene. Much of the western par)]varyingVW)WvegetationWvegetativeDWEWvein1Wveins'WveleskavWionWvegetativeDWEWvein1Wveins'WveleskavWavWavWeleskavWavWavWWJWWveins'WveleskavWvergenceHWIWJWJWJWJWJWJWJWJWWJWJWJWWJWJWJWWWWWWIWJWWW;outcropAWoutcropsMWAWouterXWWWWWouter-fanWoutside\WoutwardWoutwashCWWWWWWIWoverWoverlainSW'WWoverlievWWoverliesDWSWnWVWWWWW)WoverprintWoverprintedW1WowingXWoxidesoWoWoWoWoWoWoWoWoxidesoWoWoWoWoWoWoWoWoWoWoWoWoWpWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWpale-olive^WpaleoceneAWVW[WdWOWpaleodictyonRWpaleozoicEWFWeWWWWWWW W!W"W#W$W%W&W-W.WWWWpalynflora_WdWeWfW.Tyukon-koyukukCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWP$pBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWWpamphletBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWpartWpattonCWDWEWFWMW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\W\WWW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WW\WWW\WW\WW\WW\WW\WW\WWWWWWWWWWWWWpattonwwjrwilsonfhlabaykaandshewnorainpreprecCVDVEVFVMV\VVVVVVVVVVVVVWK€Xand others, 1998 (DOGmap)J €YA5020PofBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W W W W W WOpQ"A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4$A4880B@Massive, isotropic, medium-grained, light to medium green gabbroCMzgDMesozoicEGabbrocEBasaltFKarl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.$A4880B@Massive, isotropic, medium-grained, light to medium green gabbroCMzgDMesozoicEGabbroEGabbroa] Ä2&@ @ @ P0 AAAA/M"Bas an accessory mineral. The complexes are intruded by narrow dikes of fresh clinopyroxenite, hornblendite, gabbro, and gabbro pegmatite. The complexes are believed to form the roots of the Koyukuk volcanic arc that appears to have been active from Jurassic to late Early Cretaceous The protolith age of the mantle suite is uncertain and may be as old as Paleozoic. K/Ar isotopic cooling ages from the magmatic suite average 159 Ma and two 40Ar/39Ar determinations yielded a plateau age of 1C62 Ma. K/Ar isotopic cooling ages from the metamorphic sole at the base of the complexes range from 172 to 155 Ma and one 40Ar /39Ar determination from the metamorphic sole yielded a plateau age of 161 Ma CMzPzumDMesozoic and Paleozoic?EMafic-ultramfic complexesLInof!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWopen-fileBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWW9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9W9WQ9databasesCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWdigitalCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W€b€cA5021AFine- to medium-grained, commonly calcareous graywacke and granule conglomerate, which contain clasts of chert, shale, argillite, and volcanic rocks. Graywacke and conglomerate are interbedded with argillite. Unit contains microfossils and bryozoan and echinoids fragments assigned to a Permian(?) age in the Ruby quadrangle and assigned more generally to a late Paleozoic age in the Ophir quadrangle. Unit appears to interfinger locally with unit TrDc CTrMgDTriassic? to Mississippian?EGraywacke, grit, and argilliteA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003j €EA4340 and others, 1998 (DOGmap)€EA4340Y&4€E@SA€V@BAA@€W@AC€XJ€Y@KA€ZAE€[B8A;€^@D€_B!€`@An€b@AR€e@BD€v@)C€z@AFF€z@A€z@A€z@AAA€z@AAA€~@AAA€@B€@B€@B€B€B€B€B€BBC€B€B€B€B€B€B€BB€B€BB€B€B€B€B€B€BB€B*WfaultedWfaunaUWWWWWWW W+WfaunasVW)WW)W)W)W)WWVWWfaunasVWVWW W W W W W W W W W W W W W W W WWtWW W W W W W W WuresWWfeederskWlWmWnWfeetUW[WWWW W WfeldsparoWUW]W^WWWWWWW W Wfeldspathic^W WWWWWfelsicvWyW_WWWWWWWWWWWWWWWWfenestralWfewW WJWxWWfieldcWvWWfieldsWWfigeWWW_WbWWfill_WfinallyWfineCW{WGWPWRWSWUWXWYW[W\W^W_WaWfWgWWWW W1WMWbWgWWWWWWWWWWWWWWW W Wfinetocoarse-grainedequigranulartoporphyriticbiotiteg{Vfinetocoarse-grainedgranitequartzmonzonitegranodioriteVVseparatelycWyW\WWWWWW0WsequenceXW`WWsequencesoWserpentiniteWWserpentinizedWWXW[WW W!W"W"W"W"W"W"W"WiteandserpentinizedWWXW[WW W!W"W"W"W"W"W"W"W"W"W"W"W!W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WW"W"W"W"W"W"W"W"W"W!W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WserpentinizedperidotiteduniteandharzburgitehavingassocUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVUVVVVVVVVVVUVUV9W;W<WOWshallow[WQWSWTWbW4WshallowwatermarinesequenceofthinlybeddedcalcareoussabVshallow-marineeWWWWw3mcgrathzWmckinleyvW_WWWWWWWmclWWWWWWWWWWWWWWWWWWmclWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWHWnW}WGWPWSW_WfWgWWWWWWWWWWWWWWW W!W"W#W$W%W&W1Wmedium-grayKW\WaWRW]W_WWWWWWWW7W8W9Wmedium-lightWWWmedium-olive-grayPWmedium-scale_WmegafossilsfWgWWmelangeWdWeWfWgWW-W.WmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WmemberKW2W3WmembersKWMWNWWmeta-andesiteHWIWJWmeta-areniteWWdY€'@EB"€.@TASCT€.RASCT€.ASCT€.RASCT€.ASCT€.RASCT€.ASCT€.CT€.CT€.CT€.CT€.CT€.€-ASCT€.T€.€-ASCT€.ASCT€.€-ASCT€.CT€.ASCT€.CT€.€.ASCT€.ASCT€.CT€.€-ASCT€.XT€6@^Aj^€6Aj^€6Ajj€6@Bj€6@6@6@j€6@lk€7BmCn€8BoCp€9BuCv€;A}€AC€?B€@AC€AB€BAC€CB€EA€GA€HE€JA€KAC€LB€MA€NA€OB€QA€RA€SA€TA€UAC€VB€WAC€YA€ZAE€\E€_AC€aA€bAE€dBD€eBD€fBD€gD€iA€jA€kBD€lBD€mBD€nBD€pAC€rA€tAC€uAC€vC€xA€yA€zA€{A€|A€}A€~A€AC€BstatesCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWstudiesWsurveyBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWW(W)W*W+W-W.W/W0W1W2W3W4W5W6W7WpWwfintegrated'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWinteriorBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWandBWCWDWEWFWMW\W]W^WcWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWK(BjGreenstone and greenschist bodies representing altered mafic and intermediate volcanic and intrusive rocksCMzZmsDMesozoic? to Proterozoic?E MetabasiteA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003)A5280AVariably altered and metamorphosed flows and shallow intrusives of basalt, diabase, and gabbro interbedded with varying proportions of chert, argillite, slate, phyllite, volcaniclastic rocks, graywacke, and carbonate rocks. The basalt, diabase, and gabbro are weakly metamorphosed to prehnite-pumpellyite facies and generally increase in metamorphic grade structurally downward. Greenschist facies metamorphism and locally high-pressure blueschist metamorphism, as indicated by the presence o"j%€6A4032AComposed of quartz-carbonate sandstone and conglomerate in the lower part of unit and spiculitic chert in the upper part. Sandstone and conglomerate consist of detrital carbonate, quartz, and chert clasts, and calcareous fossil debris. Spiculite is composed of chert, fine quartz grains, and as much as 60 percent sponge spicules. Unit contains marine mollusks of Late Triassic (Norian) age in the lower part and radiolaria of probable Triassic age in the upper part CTrsD Late TriassicESpiculite and sandy limestoneert clasts, and calcareous fossil debris. Spiculite is composed of chert, fine quartz grains, and as much as 60 percent sponge spicules. Unit contains marine mollusks of Late Triassic (Norian) age in the lower part and radiolaria of probable Triassic age in the upper part CTrsD Late TriassicESpiculite and sandy limestonelson and others, 1998 (DOGmap)RSXA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A5145AMelange consists of blocks of carbonate rocks, chert, metagraywacke, and altered mafic volcanic and intrusive rocks in a matrix of phyllite. Within the melange unit the large blocks of carbonate rocks from units |ca and |cr and altered basalt, diabase, and gabbro from unit JDv are mapped separately. Melange probably formed during time of tectonic emplacement of Angayucham-Tozitna terrane structurally above Arctic Alaska and Ruby terranes. CKJmDEarly Cretaceous? and JurassicEMelangeqchert-pebbleoWWWchert-richvWcherty\WoWVWbWWW)WchieflyCWFWDWRWVWWWYW]W`WaW]W`WaWWaWWaWWaWWaWaWWaWaWWaWaWaWaWaWWaWWaWWaWWaWWaWWaWWaWWaWWaWWaWWaWWaWW`WaWWaWjWjWjWjWjWjWWjWWjWjW`WiWjWjWjWjWWjWjWjWjWjWc`  theEWVWWWXWYWZW[W^W_W`WcWeWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW3laterallyWlatesteWfWWlathslWWlaumontiteXWlavaFWoWpWxWnWWWWWlavas\WlawsoniteVW)Wlayer[WW W!W"Wlayered&W'WlayersoWXW]W[WWWW W!W"W4W4W4W4W4W4W4W4W4W4WlddWldlWWldlWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWrWWWa{theBWCWFWMW\WoWvWyWAWDWUWVWWWXWYW\W]W_WkWoWuWWWWWW W'W6W6W6W6W6W6W6W6W6W6W6W6W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1W1WWsteepAWsteigerXWstillDW&Wstock^WstrandAWstrataWstratifiedWWWstratigaphicallyWstratigraphicXWWWstratigraphicallyDWSWWW`WstreamWWWmWWWstreamWWWWWstreamWWWWWWWWWeamWWWWWWWamWWWWstreamWWWWWWWWWWWWeamWWWWWWWWWWeamWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWreamWW@7upwardSW]W_WoW_WWWusingXWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW)W*W+W,WvalanginianaW W W WvaldezWW^WiWjWkWWQWcWWWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W-W.W0WWWWWWWWWWWWWWWWWWvalley(W)W*W+W,WvalueuWvariableWvariablyEWFWiWjWkWlWmWWWWWWWWWWWWvariablymetamorphosedbutlargelylowergreenschistfaciesVVVVVVVVVVvaricoloredoWvariesOW4WWvarietycWgWWWWvariousAWOWSWWWZWdWWWWWWW W!W"W#W$W%W&W5WjWWWWWW5usually@varying@Fvertical@volcanic-rich@volcanics@we@wehrlite@dwestern[westward@whereas@wholly@will@with@within@wolverine@4yellow-gray@yukon@zs@0mgq@pzvs@@@@@zones@0mde@pzsc@@@@yukon@zones@0mde@pzsc@@zoned@00>) AFine-to medium-grained, thinly cross-bedded, fossiliferous sandstone and poorly exposed dark siltstone and shale. Clasts composed of 40 to 45 percent quartz, 45 to 50 percent volcanic and sedimentary lithic fragments, and 5 to 15 percent feldspar, chiefly plagioclase. Clasts set in a finely divided calcareous and argillaceous matrix. Unit deposited in a nearshore marine environment. Unit contains abundant early Late Cretaceous (Cenomanian) species of Inoceramus CKssDLate CretaceousE.Shallow marine sandstone, siltstone, and shaleA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 A1970FmapBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWmf-492WmillerWmiscellaneousWWWWWWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W{u[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWtedCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6W[WbWcWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"WwCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6W[WbWcWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"WwilsonBWCWDWEWFWMW\W]W^WcWlWoWpW^SQ€6A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4XCVBy terranes. Grades downward into unit (Kmc) reflecting the progressive unroofing of the Arctic Alaska and Ruby terranes beneath the Angayucham-Tozitna terrane. Unit is regionally metamorposed to stretched-pebble conglomerate, semischist, and phyllite in northeastern part of the Shungak quadrangle and in adjoining parts of the Ambler River and Hughes quadrangles. Sparse plant fossil collections from this unit range in age from late Early Cretaceous to Late Cretaceous. A K/Ar isotopicCX cooling age of 86 Ma was obtained from interbedded ash-fall tuff in Selawik quadrangle 4CKqcD CretaceousEBQuartz- and metagraywacke-clast conglomerate, sandstone, and shaleA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.+ANonmarine, fluvial, delta-plain deposits that grade downward into marine delta-front deposits. Fluvial deposits are characterized by fine-grained, locally cross-bedded quartzose sandstone interbedded with micaeous shale and siltstone. Near the base, the fluvial beds are composed of fine- to coarse-grained, lenticular, crossbedded, friable sandstone and conglomerate containing pebble- to grit-size clasts of quartz and chert and lesser amounts of mafic intrusive and extrusive rocks, and schiBst. Contains bituminous coal seams as much as 3 feet (90 centimeters) in thickness. Sandstone composed of quartz, chert, metamorphic detritus, and subordinate amounts of volcanic rock fragments. The quartzose nature of the lithic clasts (including polycrystalline quartz), as well as the relatively high proportions of potassium feldspar and micas suggest a mixed metamorphic and granitic provenance. These data, when combined with limited paleocurrent data, indicate that the unit progradegp€€A6900BTan- to brown-weathering, dull greenish gray, maroon, gray or white, thin- to medium-bedded, commonly cross-bedded, quartz metasandstone, metasiltstone and phyllite.CDnDDevonianENoatak SandstoneO€`A3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003wVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWweberBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWwilsonBWCWDWEWFWMW\W]W^WcWlWoWpWM &A5241Maroon, red, green, gray, black, and variegated chert and siliceous argillite, minor maroon calcareous siltstone and argillite, and rare maroon or gray limestone lenses.CJPeDJurassic to PennsylvanianEEtivluk Group, undividedFKarl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.&A5241S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.&A5241r` chertVWWWYWZW_W`WbWcWeWfWvWWWWWWWWWWWWWW WWWWWW)W2WchertmetachertmetatuffquartzitephylliteandotherassociYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVYVringWWWWWWWWWWWWert-bearingWWWWWWWWWWWWWWWWWWqchapman\WvWYWWWZWeWWWWWcharacteristic_WvW&WcharacterizedlWUWXWnWVWWWWWWW WW)W<W@WAWBWCWIWcharley_WWchemicallyWchertBWSWUWVWWWXWYW]W_WoW6W6WW6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6WYW]W_WoW6W6W6W6W6W6W6W6W6W6WWoW6W6W6W_WoW6W6W6WW6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W7W7WW6W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W7W6W7W7WW7W7W7W7W7W7W7W7W7W7WxterranesVWWWWzsiltstone\WoWRWSWUW\W]W_WaWWWWWWWWWWWWWW W W W WWKWLWsiltyWWWWsilurian_WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW`WeW WWWWWWW W!W"W#W$W%W&W-W.W6W=W>W?W@WAWBWCWNWWW_WbWdWeWfWkWlWmWnWWWWWWWWWWWWWWWWWWWsimilarities;WsimilarityWsinemurianKWLWsingledW-W.WsischuoWuWvWwWsizePW_WskolaiWWWWWWWWWWWWWWWWWWW$predominantly\WpredominatelyWWWprehnite-pumpellyiteVW)WpresenceXW_WVWWW)WEWFWpresentSWWWXWoWWWWWWpreserveDWpreservedWWWWWWprevailingWvailingWWWWgWWWWWWWWWWWWWWWilingWWWWWWWWailingWWWWWWWWWWWWngWWpreviousWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWpreviousWWWWWWusWWWWWWWWWusWWWWWWWWpresumedWWjWprevailingWpreviousWWWWousWWWWWWWWWWEshallowsWRWSWUWWWWW W WWJWshallowintrusiverocksofsilicicandintermediatecompositsVVVVJVshallowmarinesandstonesiltstoneandshaleRV VsheetsWshoshoniticWshoshonitictuffsandlavaflowsVVVsVVVWsiliciclasticpWsillsWsiltWsiltstoneRW\W]WWWWW W W WWskolaiWWWWWWWWWWWWWWWWWWWWWWWskolaigroupahtellplutonVVskolaigroupdioritecomplexVskolaigroupeaglecreekformationVskolaigroupgabbroandorthogneissVskolaigroupmarbleVVskolaigroupshallowstocksdikesandsillsVskolaigroupstationcreekandslanaspurformationsandequVskolaigroupstrelnametamorphiccomplexVVVVVVVVVVskolaigrouptetelnavolcanicsVVVVWWmdceWmedfraoWvWYW_WeWWWWW W WWKWLWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW WWWWWWWdium-dark-grayAWPWSW_WhWiWmedium-dark-olive-grSWmedium-grainedHWnW}WGWPWSW_WfWgWWWWWWWWWWWWWWW W!W"W#W$W%W&W1WMWgWmedium-grayKW\WaWRW]W_WWWWWWWW7W8W9W;WMWgWmedium-lightWWWmedium-light-gray;Wmedium-olive-grayPWmedium-scale_WmegafossilsfWgWWmelangeWdWeWfWgWW-W.WmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WUWVW_WmemberKW2W3WmembersKWMWNWWmertiegWmeta-andesiteHWIWJWmeta-areniteWWmeta-graywacke`Ws ]terraneVWWWWWWW WWWWWW&W)W1W7W7W7W7W7W7W7W7W1W1W1W)WWWWWWWWWWWWWL&mappingZWWWWWWWWWWWWWWWWcumulate[WW W!W"WcurrentWcutW1Wcycles_WWWcyclicallyoWWWcyclicallyinterbeddedfinetocoarse-grainedhighlycalcareVVVVVVVVyinterbeddedfinetocoarse-grainedhighlycalcareVVVVVVVVVVVVVVVVlcareVVVwaWWWczwadWczwgWczwlWWdWdaWWdaciteoWpWsWvWyWeWiWjWkWlWmWWWWWWWWWdaciterhyoliteandtrachyandesitelavaflowsdomessillsdioVVdaciticnWoWpWqWWdallpWdarkxWRWSWoWpWqWWWWWWWW W!W"W#W$W%W&W7W8W9WWWbWvWwWWWWWWWWWW W W WWWdarkgrayandblackchertsiliceousslateargilliteandlessVdarkgreenishveryfine-grainedchertytuffgradingintogrebV549A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4;A1655BFine to coarse-grained, equigranular to porphyritic, biotite granite and rarely muscovite-biotite granite. K/Ar isotopic cooling ages for this unit range from 71 to 63 MaCTKgD"early Tertiary and Late CretaceousEGranite and granodioriteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4W?W@WAWBWCWthreeMWNW W WWkWthroughgWdWWWWW(W)W*W+W,WRWSWTWthroughoutAWBW[WgWrWsWWWWWWW W!W"W#W$W%W&WthrustEWFWHWIWJWW W WWMWNW_WthrustingZWWti^Wd>6@6A7D88A99@5A{W?W@WAWBWCWkateelcWUWXWYWZW[Wkathul_WkatolinatWkcdWeWfWgWkcsRWkelley4WkenaiHW4Wkeyserling WkgVWkgr@WkgsXWYWkgwZWkhcWWkilometerskWfWgW" CTsDTertiaryEDSmall deposits of nonmarine conglomerate, sandstone, shale, and coalA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4QJdataCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWWWWWWWWWWWWWWWWWW WdigitalCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W[WWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W,K1989vWAW1992AW_WWWXWYWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW=W>W?W@WAWBWCWQW1997[W\W^WcWAWTWiclocalCW_WWWWlocalitieseWlocallyDWoWAWUWVWWWXWYW_W`WoW~W W'WVWWWXWcWvWWWWWWWWWWWWWWWWWW W W WWWWWWWW)W+W-W.W1W2W<W@WAWBWCWEWFWGWKWLWGWGWGWGWGWFWFWCWCW6W5W6W6W6W6W6W6W6W6W5W6W6W6W6W6W6W6W6W2W2W2W2W2W2W2W2W2W1W1W1W1W1W1W1W1W1W1W.W.WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWMWNWKWLWlolbWloneyUWlongfWgWWWWWWW W!W"W#W$W%W&WlowRWSWTWVWWWZW4granite@_graphitic@~great@ greenish-gray@greenstone@grit@hard@.hauterivian@having@healy@herein@hills@however@hydrothermally@|hypabyssal@in@incipiently@includes@includesthewrangelllavaconsistingchieflyofbasaltand@indeterminate@W?W@WAWBWCWdicotyledonRWdidWWxWdiffereWdifferencesWWWWWWudover\W_WWWvWWWWWWdown\WdownwardUWVWVWW W)WdriftWWIWdsWWWWsWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&WQWUWaWWWWWWWduringWdWWdusel-baconAWdutroWWWWeWeachkWlWmWnWeagleQWRWSWTWWearlierWWearlyW@WBWEWFWOWQWoWpWqW W WWWWWWWWWWW W!W"W#W$W%W&W-W.W2W3W4WJWKWLWOWtWuWWWWWWWeastcW@WGWTW_W W WWWWQWRWSWTWbWWeast-central0WeasternOWbWWWWWWWWj€A107BChiefly silt and very fine sand including thick deposits of micaeous silt in the Koyukuk Flats and Nowitna and Innoko Lowlands. Local deposits of alluvial fan and glacial outwash gravelsCQuaD QuaternaryE$Surficial deposits, undifferentiatedy coincides with the southern limit of glacial ice. In the Bettles quadrangle the southern margin of the unit is made up chiefly of lacustrine sediments deposited from a large proglacial lake.CQmD-Quaternary, Pleistocene and possibly PlioceneE%Glacial and glaciolacustrine depositsF Wilson and others, 1998 (DOGmap)€A107BChiefly silt and very fine sand including thick deposits of micaeous silt in the Koyukuk Flats and Nowitna and Innoko Lowlands. Local deposits of alluvial fan and glacial outwash gravelsCQuaD QuaternaryE$Surficial deposits, undifferentiatedj€AIncludes unsorted to poorly sorted till, outwash sand and gravel, alluvium, and eolian deposits. Along the southern edge of the Brooks Range, unit is characterized by little-modified middle and late Pleistocene drift including prominent morainal ridges (shown by hachured lines), ice-contact features, and glaciolacustrine deposits. Further south, in the Bettles, Hughes, Shungnak. and Selawik quadrangles, the unit is composed of discontinuous areas of highly modified drift of Pliocene? andBR early Pleistocene age interspersed with alluvium and eolian deposits. Glacial erratics occur in hilly parts of the central Shungnak and Hughes quadrangles to an elevation of 1,500 feet (600 meters). In the Bettles quadrangle the southern margin of the unit consists chiefly of lacustrine sediments deposited from a large proglacial lake@CQTglDPleistocene and Pliocene?E%Glacial and glaciolacustrine depositsA5amphiboliteAWamphibolitefaciesmetamorphicrocksAVamyWamycreekunitVandDWEWMW\WcWoWpWsWvWxW{WRWSWUWVWWWXWYW\W]W`WnWoWpWsWvW~WWW W'W6WVWWWXWZW^W_W`WbWcWeWfWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWBintermediate@mafic@0melange@6metamorphicbasementrocksofthenixonforksequencemeta-q@metamorphosed@minor@8nepheline@nixon@nonmarine@Kpillow@Dpzcs@pzcs@@noatak@Kpillow@Dpzcs@andstonesiltstone@Kpillow@Dpzcs@ateunitsofholitn@Kpillow@Dmarinecarbonateunitsofholitn@Kpillow@Desiliceoussiltstoneandargillite@Dcorr@Kphylliteslatesiliceoussiltstoneandargillite@Dliceoussiltstoneandargillite@Dcorr@Kphylliteslatesiliceoussiltstoneandargillite@Dunnamedcorr@Mnamedcorr@MMnamedcorr@Mamedcorr@MMpartingsWWpartly[WWWWWW W!W"WpartsDWVWVWZWWWWW)WIWpatches'WpatternuWpatternsAWpattonvWYW`WWWZWeWzWWWWpb/pbWWWWWWWWWWWWWWWWWWWWWWWWWWWWpavlis.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.W.WWWWWWWWW-W.WWWW-W.WW7W8W9WpebbleAWHWYWRWSWTWWWXWYW[WcWW WWWcWWWWWpebble-sizedWpebblesWJWpebblyAWMWNWYWaWWWpelagitetWpelecypodW7W8W9WpeliteWWpelitic@WWWWWQWWWWWWWWpeloidWWpeloidalWD unitVWWWXWYWZW^W_WbWcWeWfWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWW&W'W)W+W-W.W1W2W7W<W@WAWBWCWDWEWFWGWHWIWKWLWunitcomposedofsyenitemonzoniteandsubordinatequartzmoVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVtschieflyofbiotiteandmuscovite-biotitegrani?:flowsDWEWFW]WcWoWpWxWoWpWWWWWfluvialSWUWW WfluvialandshallowmarinesandstoneandconglomerateSVfluvialandshallowmarinesandstoneandshaleundividedUVV Vflysch_W WforkWWWformationWWWformationsWfossilWfossilcreekvolcanicsVgabbroVW)WHWgabbroanddiabaseHVglacialWWIWglacialandglaciolacustrinedepositsVVIVglaciolacustrineWWIWglobeWglobequartziteVgneissWW7WDWGWW7W7W7W7W7W7WWWWWWssWWWWWWWWWartziteVgneissWWWWWWWWWWWWgneissWWWWWW{fork-uppervWform[WW W!W"WformationWWWWformedWformerlyWforms^W'W'W'W'W'W'W'WWW'WWWWWWWWWWWWWWWWWWWW0WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWvolcanicskWWWvolcano-plutonicvWSWvrzWvrainWWWw`WzWwackestoneWWwasDWVWWWWWwaterWwater-laidWwaterlaideWwavelikeWwavyWWyWWWWWWWWvelikeWWWWWwavelikeWWWWWWWWWWWWwavelikeWWWWWWWWWWWWWWWWWWWWWWWWWWWikeWWWWWWWWWWWWWWWWWWWelikeWWWeWWWWWWWWWWWWWWWWWWWWelikeWWW€B northeast winds.; 3) Ruby quadrangle: A broad sheet of wind-blown silt and sand that extends over a wide area in the Nowitna Lowland south of the Yukon River. The sheet is much modified by stream erosion, but parabolic and longitudinal dune forms can be recognized in aerial photographs and on 1:63.360 scale topographic maps. The dune forms have a strong NE-SW orientation and suggest deposition by prevailing northeast winds. Small isolated sand sheets also occur in Bettles, Hughes, anCd Medfra quadrangles CQsDHolocene and PleistoceneEEEolian and water-laid sand and silt sheets and stabilized dune fieldsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A125T9|basaniteDWbaseoWUWXWVW[WWWWW WW W!W"W)Wbased_W`WXW^WeWWbasementWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW*zEE*Pelitic schist, calc schist, and quartziteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4FA9325AQuartz-mica schist, chlorite schist, quartzofeldspathic schist, quartzite, and micaeous and graphitic schist. Regionally metamorphosed to greenschist-facies, but also locally includes high-pressure greenschist-blueschist-facies (distinguished by the presence of glaucophane) and amphibolite-facies (distinguished by the presence of sillimanite and kyanite). Andalusite-cordierite hornfels and contact schist occur in broad bands around Cretaceous granitic bodies of units Kgr and Ksy. Unit  @A7453PzZuaDPaleozoic and ProterozoicEVPelitic schist, calc schist, and quartzite (|Innoko assemblage: Chert, argillite, and volcaniclastic rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.fera that range in age from latest Devonian to possibly as young as Triassic /CTrDcDTriassic? to DevonianEChert, argillite, and limestoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4scale 1:500,000.490UWuWW W921WWGW96WW99WaEW\W]W^WlWoWsWxWyWAWRWSWUWVWWWXW\W]WoWpWsWuWWW'WZW[W_W`WbWcWeWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWW W!W"W&W-W.W0W1W2W7W<W@WAWBWCWDWGWHWIWJWKWLWCWCW7W7W7W7W7W7W7W7W2W2W2W2W2W2W2W2W1W1W1W1W1W1W.W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWvolcanicgraywackeandconglomerateYVVvolcanicgraywackeandmudstone`VvolcanicrockskVvolcanic-clastXWWWWvolcanic-clastconglomeratesandstoneandshaleVvolcanic-clastgraywackeandmudstoneXVvolcaniclasticcWoWpWxWoWpWeWWWWvolcanicsWvolcano-plutonicyWvolcano-plutoniccomplexesyVwater-laidWwhirlwindWwhirlwindcreekformationVwhirlwindcreekformationVVWWdWWWWWwhirlwindWWVwater-laidWwhirlwindWWWWWW Wwilbercreekflysch_Vwilbercreekflyschandwolverinequartziteundivided VwishboneOWRWwishboneformationRVwolverineWWW WwolverinequartziteVVVyanertWWWyanertforksequenceandcorrelativerocksVyanertforksequenceandcorrelativerocksfine-grainedschiVVyoungeroWyukon-tananaWWWWWWWWWWWWWW EX@NSACLASSJ SB@F@A Ee A@"#A&#E,@(A/A10A23@23@{{{42@{{2@{42@{{2@{{A42@{2@{A42@{{2@{{A42@{42@{42@{42@{{2@{2@{A42@{{{2@{2@{42@{2@{D87B98A::B;>A<@A=C>E?AB@BAACBBFACGADCEHBFDGIBHDIJBJDKLALOAMCNQAORAPCQSARTASCTVEUXAVYAWZAX[BY]AZ^E[_B\`A]aA^bA_cB`dBaeAbCeEfaradiometricuWrainbowzWrampartXWYWrangeMWxW{W|WDWVWoWuW~W'WVWXW[WeWfWWWWWWWWWWWWWWW W!W"W)WGWHWIWrangesvW_WkWWWVWWWWW)WrangesfromlightgraytowhitepartlyrecrystallizedlimestVVVVVVVVVVVVWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWzW{W|W}W~WWWWWWWWWrapidVWWrare_WaWdWnWWWWW WRWSWTWaWhWiWWWWrarelyfWgWraspberry-W.WratherUWWWWW€E5Actively drifting and recently stabilized dune fieldsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A190AIncludes unsorted to poorly sorted till, outwash sand and gravel, alluvium, and eolian deposits. Along the southern edge of the Brooks Range, unit is characterized by little-modified middle and late Pleistocene drift including prominent morainal ridges (shown by hachured lines), ice-contact features, and glaciolacustrine deposits. Further south, in the Bettles, Hughes, Shungnak. and Selawik quadrangles, the unit is composed of discontinuous areas of highly modified drift of Pliocene? and pyroxenexWoW[W`WWW W!W"WpyroxeniteDW^WWpzbsWpzcWWpzcrW'WpzcsWWWpzdzWpzlWpzlcWpzmWpzmi^Wpzpa1WpzpcaWcaWWpzpccWpzpcsgWgWWgWWWgWWpzpcsqWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW`7light-grayWlight-greenWlight-olive\We\We\Wmudstoneandwackestonelimlight-greenWlight-olive\We\We\We\We\We\We\We\We\We\We\We\W\W\Wtzosesandstonlight-greendWJWWlight-olive\W\W\W\W\Wlight-olive-gray[WWWWolive-gray[WW -:A7450CPzZuaDPaleozoic and Proterozoicted to massive, quartz porphyritic rhyolitic plugs, flows, and pyroclastic deposits. May be correlative with the Whiteface Mountain Volcanics of the Wiseman quadrangle.CPzrDDevonianERhyoliteFKarl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.:A7450CPzZuaDPaleozoic and Proterozoicpyroclastic deposits. May be correlative with the Whiteface Mountain Volcanics of the Wiseman quadrangle.CPzrDDevonianERhyoliteFKarl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.:A7450CPzZuaDPaleozoic and ProterozoicfrasnianWWfreshUW[WW WW W!W"WHWfreshtoalteredgabbroicanddiabasicintrusivebodiesunitHVfresh-waterSWfriableUWW WfromEWMWlWxW{W|WSWUWVWWWXW\W_WkWoWpWuW~WWW'WVWZW[WbWeWfWzWWWWWWWWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWW W!W"W&W)W,WGWIW,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W1W,W,W,W,W)W)WW"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWwhmedium|WAW_WvWwWWWWWWmediumtocoarse-grainedequigranularbiotiteandhornblende|Vmediumtocoarse-grainedgraniticintrusiveandhypabyssalrwVwVwVwVmediumtohigh-gradepeliticschistcontainingsubordinateqVVVVmediumtoverydark-graydensetoveryfinelycrystallinenoVVVVVVVVVVVVgWkWlWmWnWWmedium-grayKW\WaWRW]W_WWWWWWWW7W8W9W;WMWgWWmedium-lightWWWmedium-light-gray;Wmedium-olive-grayPWmedium-scale_WmegafossilsfWgWWmelangeWdWeWfWgWW-W.WmelozitnabWuWvWwWVW`WnWrWsWtWuWvWwWxWyWzW{W|W}W~WUWVW_WmemberKW2W3WkWlWmWnWWWWWWWmembersKWMWNWWkWlWmWnWrWWWmentionWWWmertiegWmesozoicWWWWWWPjX€Blocally is interlayered with carbonate rocks of unit |cr and therefore is, at least in part, Paleozoic in age. However, some of the unit may be as old as Proterozoic. The regional metamorphism clearly pre-dates the widespread intrusion of the Early Cretaceous granitic bodies of units Kgr and Ksy. Metamorphic minerals in this unit in the Nulato quadrangle yielded K/Ar isotopic cooling ages of 134 and 136 Ma CPzZsrDPaleozoic and Proterozoic?E*Pelitic schist, calc schist, and quartziteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A8801ZkcF Wilson and others, 1998 (DOGmap)bAPoorly sorted nonmarine and shallow-water shelf deposits consisting of carbonate-rich conglomerate (calcirudite), sandstone (calcarenite), and shale (calcilutite). Unit contains abundant plant debris and thin seams of bituminous coal. Clast-supported cobble to boulder conglomerate, composed almost entirely of carbonate rocks, grades eastward into trough cross-bedded, medium- to coarse-grained sandstone and pebble conglomerate fan-delta deposits, which in turn grade eastward into cross-bBLedded, fine- to coarse-grained, inner and outer shelf sandstone and shale. Chert, volcanic rock, quartz, and schist detritus present in subordinate amounts. Unit derived in large part from Paleozoic carbonate rocks (Pzcs) of the Seward terrane. Unit contains sparse palynomorphs of Cretaceous(?) age in the Norton Bay quadrangle :CKccD CretaceousE2Carbonate-clast conglomerate, sandstone, and shaleDASGranite, granodiorite, diorite, and gabbro that have a slight to moderate gneissic fabric. The northwesternmost of the two bodies is Proterozoic and has yielded a U/Pb zircon crystallization age of 705 Ma. The southeasternmost body is of uncertain age. It may also be Proterozoic or it may be Devonian and correlative with unit DgnaSCPzZiDPaleozoic? and ProterozoicEGranitic gneissA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4EA8625YtholeiiticEWthosekWuWthoughtWthreeMWthroughDWWWWWWWthrustWWWtWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWthrustingWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W WWMWNW_WWWthrustingZWWWWWWWWW!beneathVWberriasianoWnoWoWbestnWWWWWWWWWWWWWWWfsubunitWubunitWWWWWitWWWWWWWWWW[mwestwardUW\WW WwhenUWW WwherecWvWkWVWW W WW)WKWLWtstudiedinthemcgrathquadranglebundtzenandotnVnVnVnVVnVnVnVnVnVnVnVnVnVnVnVnVnV€A105BGravel, sand, silt, and peat. Floodplain deposits in Koyukuk Flats and along Yukon River composed mainly of light gray micaceous siltCQfDHoloceneE#Floodplain and tidal flats depositsFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix. two belts of melange between strands of the Denali fault sFMystem, and correlated these with the Windy terrane of Jones and others (1982) CKmarD?Silurian to Cretaceous protoliths; Cretaceous melange formationEMelanges of the Alaska RangeF Wilson and others, 1998 (DOGmap)€A105BGravel, sand, silt, and peat. Floodplain deposits in Koyukuk Flats and along Yukon River composed mainly of light gray micaceous siltCQfDHoloceneE#Floodplain and tidal flats deposits€AFine- to coarse-grained sand. Great Kobuk and Little Kobuk Sand Dunes in the southwestern Ambler River and southeastern Baird Mountains quadrangles, and Nogahabara Sand Dunes in the Kateel River quadrangle. The Great Kobuk and Little Kobuk dune fields covering 24 square miles (65 square kilometers) and 3 square miles (8 square kilometers), respectively, are composed of parabolic or U-shaped dunes and large transverse dune ridges that locally develop into barchan-like dunes. Wind direBction varies from NE to SE. The Nogahabara Sand Dunes are characterized by a circular field 5 miles (8 kilometer) in diameter consisting of transverse dunes that migrate outward in wavelike fashion from a deflationary area in the central and western part of the field. The main field is surrounded by smaller circular and elliptical fields of wavelike transverse dunes that have been recently stabilized or partially stabilized by a thin cover of vegetationCQsaDHolocenekzWk-arXWeWWk-feldsparWk/arEW]W^WlWxWyW{W|WVWoWpWsW~W'W[W_WWWWWWWWWWWWWWWW W!W"W-W.W0W<W@WAWBWCWEWFWGWk20WkaltagMWZWkantishnaBWvWWWWWWkateelXWYW\WWWkathul_WkceWkccWkcgWWkenoWkgrWEWFWkgsYWkilometerWkilometersWsWWtersWWersWWWWWWWWWWWWWWWWtersWWtersWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWtersWWWWWWWWWWetersWWWmetersWWWWWWWmetersWWWWWWWWWWWWWWWWtrachyandesiteoWWtrachyitesWWWWJWtrachytepWtransitionalnWWWtransverseWtrdccW2Wtriassic6WXW`WfWWtributariesMWtrilobitesWtrmbZWtrmceWtrmraYWtrmrbYWtrmrgXWtrmrlYWtrmrsYWtrmruWWtrmrvXWtrondhjemite'Wtrondhjemitetonaliteandsubordinatequartzdioritediorite'Vte'V'Voritediorite'V'V'V'V'V'Vte'V'V'V'V'V'Ve'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'V'VW'Wjemite'W'W'WtrondjemiteWWWWWWWWW.ghauterivianaWnWhaveDWoW'W[WvWWWWWWW W!W"WDWDWDW"W"W"W"W"W"W"W"W"W"W"W"W1W"W"W"W"W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWi€BR early Pleistocene age interspersed with alluvium and eolian deposits. Glacial erratics occur in hilly parts of the central Shungnak and Hughes quadrangles to an elevation of 1,500 feet (600 meters). In the Bettles quadrangle the southern margin of the unit consists chiefly of lacustrine sediments deposited from a large proglacial lake@CQTglDPleistocene and Pliocene?E%Glacial and glaciolacustrine depositsA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A285BMHigh-level deposits of quartz pebble gravel; overlies basalt flows of unit TbCQTgrDQuaternary or TertiaryEQuartz gravel depositsfquartzofeldspathicWWW-W.WEWFWquartzoseUWVWaWWW WGWGWistandparagneissquartzoseUWVWaWWW WGWGWGWGWGWWWW W W W WWW W W W W W W W W W Wpathic-wWquartzoseUWVWaWWWWW W W W W W W W W8nephelineWWsequenceyoungerlimestonenephelineWWWngerlimestoneoVnephelineWWWphelineWWWWWWimestonetone€ADominantly argillaceous, containing distinctive tan-weathering gray calcareous siltstone and fine-grained sandstone, subordinate quartzite and chert, and locally, a few black clastic limestone interbeds. Corresponds to the CZwa unit of Weber and others (1992) in the Livengood quadrangle, unit ng of Pewe and others (1966) in the Fairbanks quadrangle, and the PzpCa unit of Foster and others (1983) in the Circle quadrangleCCZwaDCambrian? and Late ProterozoicE(Wickersham grit, Argillaceous upper unitFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.€A8640ically gradational with argillaceous upper unit (Czwa). Corresponds to the Zwg unit of Weber and others (1992) in the Livengood quadrangle, and the PzpCqg unit of Foster and others (1983) in the Circle quadranglefine-grainedtogrittygraywackeandlaminatedmicaceousmudVfine-toRW_WW Wfine-tomedium-grainedthinlycross-beddedfossiliferoussanRV VfinelyRWXW]WWWW WWfinelybandeddaciticandrhyoliticlavaflowsbasalbrecciaVfining_WfirstMW`WfissileWfiveMWflatWflatsCWWWWWWWWflexicostatus_WfloodplainWWWflowDWWWflow-bandedWflowsDWEW\W]WoWpWvWxWkWnWoWpWvWVWWWWWWWWWWWWW'W)WflowsofandesiteandbasaltinterbeddedwithtufftuffbrecoVfluids'Wflute]WfluvialUW\WW W\WW W W Wds'Wflute]WfluvialUW\WW W W W W W W W WW W W W W W W W W W W WW W W WW W W W WW W W WhillszWhillyWWIWhintsBWhorizons W WWKWLWhorizontaluWhornblende|WsWhornblende-bearingWhornblende-biotite~WWhornblendite[WW W!W"WhornfelsyWW W WWWEWFWKWLWhostyWWWWhowWWWWWWWWWWWWWWWWwWWWWWwWWWWWWWWWWWWWWWWWWWhowWWWWWWWWWWhowWWWWwWWWWWWWWWWWhowWWWWWWWWWWhowWWWWWWWWWWWWWWWWWWWWWWWWWWWhowWWWWWWWWWWhowWWWhowWWWWWWWWWWWWWWWWhughes`WnWhundredxWWWW> fXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWfieldWforCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W6Gmetamorphicbasementrocksofthenixonforksequencemeta-qVmetamorphicbasementrocksofthenixonforksequencemetavoVZ= surveyWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWtBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW8DmetamorphosedWmetavolcanicWmetavolcanicrocksVetamorphosedWWtrocksofthenixonforksequenceundivimetamorphosedWW  alaskaWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWHWHWHWHWHWHWHWHWHW{dominantlydarkgraytypicallyphylliticsiliceoustocarbonvVdominantlymediumtomedium-dark-graygarnetiferousquartz-mAVdominantlymedium-darktodark-graythin-bandedbeddedradioeVdominatedWmetamorphicquartziteschistosequartziteanddominatedWWWcquartziteschistosequartziteandVVdominatedWWWWtz-richandquartzofeldspathicparagneissquadominatedWWWWchandquartzofeldspathicparagneissquaVdominatedWWchandquartzofeldspathicparagneissquaVdominatedWWchandquartzofeldspathicparagneissquaVdominatedWWtz-richandquartzofeldspathicparagneissquaVVVnantlyquartz-richandquartzofeldspathicparagneissquaVVVVVVV V1992aWWzW1993vWW1994WWeWWW1994a`WWWeW1995WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW=W>W?W@WAWBWCWQWWWWWWWWWWWWWWWWWWWWWWWWWW1997[W\W^WcWAWTW)A€vCTrPsDTriassic to PermianESedimentary rocks, undividedFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.lcaniclastic rocks, yellowish- to reddish-brown highly calcareous argillite or limestone, and minor intrusive rocks; locally may include older (Mississippian? or Devonian?) or younger (Cretaceous) rocks (Dover, unpublished data, 1997). Mapped in Tanana quadrangle. In Livengood quadrangle, eB@quivalent rocks have been subdivided into two units, Trsc and Ps.CTrPsDTriassic to PermianESedimentary rocks, undividedF Wilson and others, 1998 (DOGmap)€xA5040+wickershamWwickershamgritargillaceousupperunitVwilber_W Wwilbercreekflysch_Vwilbercreekflyschandwolverinequartziteundivided VwolverineWWW WwolverinequartziteVVVyukon-koyukukWyukon-tananaWWWWWyukon-tananaWWWWWW-tananaWWWWWWWyukon-tananaWWWWWWnedschiyukon-koyukukWyukon-tananaWWWWWWWWWWyukon-tananaWWWWWWWWWWWWWWWWWWWWWWWWWW €zA5120anodiorite of Rainbow Mountain in the Mount Hayes quadrangle (unit grrm, Nokleberg and others, 1992a), diorite in the Circle and Bid Delta quadrangles (unit MzPzd, Foster and others, 1983; unit Pzd, Weber and others, 1978), and gabbro and quartz diorite in the Talkeetna, Tyonek, and McGrath quadrangles (unit MzPzg, Reed and Nelson, 1980; unit MzPzm, Magoon and others, 1976; unit MzPzi, Bundtzen and others, 1997a, T.K. Bundtzen, written commun., 1997). Also dark-gray to greenish-gray dikB es ranging from basalt to granodiorite in the Talkeetna quadrangle (unit MzPzi, Reed and Nelson, 1980) and volcanic rocks of unknown age in the Nulato and the Lime Hills quadrangles (unit vr, W.W. Patton, Jr., written commun., 1997; unit MzPzi, Reed and Gamble, 1988)CMzPziDMesozoic or PaleozoicE'Intrusive and volcanic rocks, undividedF Wilson and others, 1998 (DOGmap)€zA5120quartz-chertSWquartz-chloriteWGWquartz-micaAWaWWWWWWW0W<W@WAWBWCWEWFWquartz-micaschistandlesseramountsofcalcschistquartzi<V@VAVBVCVquartz-micaschistchloriteschistquartzofeldspathicschistVEVFVquartz-muscovite_WWquartz-muscovite-bioWGWquartz-muscovite-chl<W@WAWBWCWquartz-muscovite-gra-W.Wquartz-muscovite-graschistcalcschistquartzofeldspathics-V.VquartziteAW_WWWWYW_WWWWWWWWWWWW-W.W0W<W@WAWBWCWEWFWGWquartzo-feldspathicWWWWspathicWWWWWWWWWWWWWWWGWGWGWGWcWWWWWWWWWWWWWWWWWWquartzofeldspathicorthogneisspeliticschistandparagneissVquartzoseUWVW\WaWWWX€zAGranodiorite of Rainbow Mountain in the Mount Hayes quadrangle (unit grrm, Nokleberg and others, 1992a), diorite in the Circle and Bid Delta quadrangles (unit MzPzd, Foster and others, 1983; unit Pzd, Weber and others, 1978), and gabbro and quartz diorite in the Talkeetna, Tyonek, and McGrath quadrangles (unit MzPzg, Reed and Nelson, 1980; unit MzPzm, Magoon and others, 1976; unit MzPzi, Bundtzen and others, 1997a, T.K. Bundtzen, written commun., 1997). Also dark-gray to greenish-gray dikB es ranging from basalt to granodiorite in the Talkeetna quadrangle (unit MzPzi, Reed and Nelson, 1980) and volcanic rocks of unknown age in the Nulato and the Lime Hills quadrangles (unit vr, W.W. Patton, Jr., written commun., 1997; unit MzPzi, Reed and Gamble, 1988)CMzPziDMesozoic or PaleozoicE'Intrusive and volcanic rocks, undividedand others, 1998 (DOGmap)€{A5170 bidzW~W~W~W~W<€E2Quartzite, grit, argillite, and quartz-mica schistFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix. tyonektypeWWWWWWWWWWWWWWWWWWWWfF^rubymetamorphiccomplexmetamorphosedmaficigneousrocksVsa:W;WsandWpeliticandquartziticschistsa:W;WsandWWquartzofeldspathicparagneissandqsa:W;WsandWWWWWWWWWinWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWW W!W"W)W-W.W0W1W2W7W<W@WAWBWCWEWFWIWKWLWinlivengoodquadrangleweredescribedbyweberandothers1Vinches]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]W]WalkalicDWalkalicbasaltconesandflowsDValteredVWW)WalteredbasaltgabbrochertargillaceousrockstuffgraywackVV)VWWWWWWWWWWsitsVVlitefaciesmetamorphicrocksAVamyWWamycreekunitVVandOWSWTW\W^WbWcWeWiWjWmWoWpWqWrWsWtWuWvWwWxW|W}W~WEWFWGWHWIWJWSWUWXWYW[W\W]W^W`WaWhWoWpWqWWWWWW W WWWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W-W.W1W5W6W:W;W<W=W>W?W@WAWBWCWDWFWGWHWIWJWKWLWMWOWPWRWSWTWVWWWXWZW^W_WaWbWcWdWeWfWkWlWmWnWpWqWtWuWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWoffsetZWoffsetZWZWZWZWreefyWreflectingVWregional^WWEWFWregionallyVWWEWFWreifenstuhlAWEWWWXWYWrelatedWWrelationkWrelationshipkWXWWXWXWXWXWXWXWXWrelativeWWWiveWWWWWWWWWWWWbWWWWWWWWWWWWWWWWWWWWbWWWWWWWWWWWWWWWWWWWWWWWLEbundtzenBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWcBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWcentralBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWdBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWW!xcompositionsWWWWJWconesDWEWconglomerateMWSWVWWWYWbWWWWWWWcorrelativeWcreek_W WWWWcretaceousWcrystal-lithicbWdacitecWoWpWpWWWdaciteandrhyolitelavaflowsdomesandvolcaniclasticandoVVdaciteandrhyolitelavaflowsdomesandvolcaniclasticrockVVVVVVVVVVVVVVVVVVkVVVVVVVVVVockVVsdomesandvolcaniclasticrockVVVelavaflowsdomesandvolcaniclasticrockVVVVVWIG+A Chiefly massively bedded light gray to tan dolomitic and calcareous marble. Locally interbedded black to dark gray calcareous marble and subordinate impure marble and calcareous schist. Unit locally contains an abundant conodont fauna of Ordovician to Devonian age CPzcsD PaleozoicECarbonate rocksA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003,A5321BScattered exposures along the western edge of the map area extending from the Norton Bay quadrangle to the southwestern part of the Selawik quadrangleCPzZusDPaleozoic and Proterozoic?EXPelitic schist, calc schist, and quartzite (PzZss) and carbonate rocks (Pzcs), undivided-A5322xG WothersWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW3WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbtyonekDWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWzWoZ]sim-xxxxCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWsouthernWCBr, in the Baird Mountains quadrangle, unit is intruded by Proterozoic granitic rocks of unit PzZi, and therefore is locally as old as Proterozoic. K/Ar isotopic analyses of the schist yielded Early Cretaceous metamorphic mineral cooling ages CPzZsaDPaleozoic and ProterozoicE*Pelitic schist, calc schist, and quartziteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4DA8500kH€A8300AMixed assemblage of laminated fine-to coarse-grained quartzite, grit, and argillite grading upward into very fine-grained quartzite, argillite, phyllite, and chert. In southeast corner of Medfra quadrangle unit is metamorphosed to greenschist facies composed of sheared and foliated grit, quartzite, quartz-muscovite schist, and subordinate thin carbonate rocks and metachert. No fossils found in this unit in the Medfra quadrangle, but to the east in the adjoining Mt. McKinley quadrangle iBt contains fossils of Silurian and Devonian age (Dumoulin and others, 1997). In the southeastern part of the Medfra quadrangle the unit is interlayered with mafic igneous rocks that yielded a K/Ar isotopic cooling age of 421 Ma. Unit may include rocks as old as Proterozoic CPzZqD early Paleozoic and Proterozoic?c cooling age of 421 Ma. Unit may include rocks as old as Proterozoic CPzZqD early Paleozoic and Proterozoic?5Q2A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.44A6320Unit includes the Hunt Fork Shale, Noatak Sandstone, Kanayut Conglomerate, Kekiktuk Conglomerate, and Kayak Shale.CMDeDMississippian and (or) DevonianEEndicott Group, undividedFKarl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p. 4A6320oD MississippianEKogruk formationgical Survey Open-File Report 89-551, scale 1:250,000, 65 p.NUpermianVWcWW)W2WpervasivelyWWpeweWWphenocrysts^WoWxWoW`WWWWWphotoBWphotographsWphylliteVW_WVWYW_WeWWWWWWWWWW)W-W.W1Wphylliteandsubordinatefine-grainedmetagraywackecutbya1VphylliticvWvWvWvWlliticvWvWvWvWvWvWvWvWvWvWvWvWphylloniteWWphyllonitesWWWWWWWWWWWWWWWWWWWWWWWWphyllonitesWWWWWWWWWWWWWWWWWWWWWWWWphylloniteWphyllonitesWWWWWWWWWWWWonitesWWWWWWWWWWsWWWWWWWWWWWWWWWWWlonitesWWWWnitesWWWWWWWWWofWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWW W!W"W&W)W+W,W-W.W0W1W2W7W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWGWGWGWGWGWGWGWGWGWFWFWFWCWCWCWCW9W9W9W9W9W9W9W9W9W9W9W7W7W7W6W6W2W2W2W2W1W1W1W1W1W1W1W1W1W1W1W.W#W"W tbWtdcWWWWWMoral`WZWorangeW5W5Worange-weatheredWWWWWWWght-graymassive-beddedcoarseconglomorange-weatheredWWWeatheredWW#talkeetnazWtan\W+Wtan-weatheringWtananaMW\WvWAWuWWWWWW WEWWWXWYWvWWWWWWWW WEWWWXWYWvWWWWWWWWWWWWWWWWXWYWvWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW'kBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWs:EVPelitic schist, calc schist, and quartzite (|W?W@WwCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6W!1977XW1978vW`WzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWdWeWfWtWW1980^WhWiWjWlWmWoWuWvWwWxWWRWSWXWYWaWcW W WWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W0W6WbWdWeWfWhWiWkWlWmWnWpWtWuWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWn€`€aA5191unitWWWWunknownBWupperWvolcanic\WYW`WkWnWbWzWWWvolcanicandsedimentaryrocksVksVVksVVVVVVcksVVsVVVVVVVVVVVVVVVVVVVanicandsedimentaryrocksVVrocksVVVVVVVVVVVksVVVVVVVVVVVVksVVVVVVVVVVVVVVVVVVVVcanicrocksoftheorcagroupundividedZVvolcanicrocksundividedDVEVFV[VKVLVMVvolcaniclasticnWdWeWfWvolcaniclasticrocksnVvolcano-plutonicyWvrainWWvrainunitVVwestOWQWwestforelandformationQVwilber_W Wwilbercreekflysch_Vwilbercreekflyschandwolverinequartziteundivided VwishboneOWRWwishboneformationRVwolverineWWW WwolverinequartziteVVVyoungeroWvsoutheastAW_WWsoutheasternFWUWEWVW_WWWWW W)WsoutheasternmostDWDWDWDWDWDWDWDWDWDWW W W W W W W W W W W W W W W W W WWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W0W4W5W7W8W9WgWsouthwest@W W WWWWW-W.W5WJWKWLWsouthwesternyWzWRWiWjWkWlWmWNWdWeWfWgWspeW W2W3W:WspanneddWsparite;WsparseAW[WWDWFWWsparsetolocallyabundantandesiteandsubordinatedaciteaVsparselyiWjWkWlWmWWspfWsphene@WspiculesWWspiculite2W3W6Wspiculitic2W3WspiliticVWWWspongeWWsppWspruceWWWWWspurWWspurious[W\W]WspurrWsq7W8W9Wsqd0Wsqm0WsshWstjWrWW-includesBWFWsWvWAWYWkWuW~WWWWVWWWXWYWbWeWWWWWWWWWWW W WWWWW)W0WEWFWGWIWJWKWLWincludesawidevarietyofshallowintrusiverocksincludingsVVVVJVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVincludesjurassicphaseofthealaska-aleutianrangebatholi,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,V,VVV,V,V,VVVVVVVVVVVVofthealaska-aleutianrangebatholi(V)V*V+V,VVV,V,VVV,V>rtozitnaassemblagesouthmaficultramaficandsedimentaryroZVtrachytepWtrondhjemite'Wtrondhjemiteandtonalite'VtroublesomeWtroublesomeunitandpossiblycorrelativerocksVtuffnWVWbWW)WtuffandtuffbrecciaVtuffvolcanicgraywackeandmudstonenVtuffsWtypeBWultramaficWWWWXWZW^WWWWWWWQWWWXWZW^WWWWWWWWWXWZW^WaWWWWWWWWWWWWWWWWXWZW^WaWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW,biotiteoW{W|WsW~W'WWWWWWW0W7Wbiotite-hornblendesWbiotite-quartz-feldsWbituminousUWVWW WWWblackEW_WWWWWWWWWWW+WblackglassyolivinetholeiiticbasaltflowseruptedfromtwEVwEVdfromtwEVwEVwEVwEVackglassyolivinetholeiiticbasaltflowseruptedfromtwEVwEVwEVwEVwEVwEVblastomylonitesWWWWWWWaltflowseruptedfromtwEVblastomylonitesWWWWWWleiiticbasaltflowseruptedfromtwEVblastomylonitesWWastomylonitesWWWblastomylonitesWWtomylonitesWWWWWitesWWWWnWtWuWWWWbodyeWWWWWWW W!W"W#W$W%W&WbordereWkWWWWWWWW W!W"W#W$W%W&W-W.WWWWWWWWWWWboss-W.WbothMWNW[W^WeW W7W8W9WuW;vshaleMWRWUWVW]WW W W W WWWWWKWLWshalesiltstoneandsandstoneundivided V VVKVLVcandintermediatecompositsVVVVshallowmarinesandstonesiltstoneandshaleRV Vshallow-marineSWWsheeppWsheetsWsiliceousWsilicicsWWWWsiliciclasticpWsillsWsiltWsiltstoneRW\WWWWW W WskolaiWWWWWWWWWWWWWWWWWWWWWWWskolaigroupahtellplutonVVskolaigroupdioritecomplexVskolaigroupeaglecreekformationVskolaigroupgabbroandorthogneissVskolaigroupmarbleVVskolaigroupshallowstocksdikesandsillsVskolaigroupstationcreekandslanaspurformationsandequVskolaigroupstrelnametamorphiccomplexVVVVVVVVVVskolaigrouptetelnavolcanicsVVVV1997\WAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWWAWTWTWTWTWTWTWTWTWTWTWTWTWTWWTWWTW"coalMWcomplexWW0WcomplexofthekokrineshillsVcomplexofthereindeerhills0VcomplexesyW[WWW W!W"WcomplexesofshallowintrusiverocksandalteredcretaceousVVVVVVVVVVVofshallowintrusiverocksandalteredcretaceousVVVVVVVVVVVVVVVVVVVlowintrusiverocksandalteredcretaceousVVVVndalteredcretaceousVVlexesofshallowintrusiverocksandalteredcretaceousVVVVWWWWndstoneandligniteoVconglomeratesandstonesiltstoneshaleandvolcanicrocksVcorrelativepWWWWWWWWWWWWWWWWWcottaWcreek_WcW WWWpWWWWWWWWWWWWWcrystalbWKWLWbWcrystalandcrystal-lithicash-flowtuffbVcrystal-lithicbWdacite`WdeepRW%!&calcareous]WWcalcareousschistVcarbonateVWWWWW)W+W,W:W;Wcarbonateandvolcanic-clastgraywackeandmudstoneVVcarbonaterocksVV+Vcarbonate-clastWWWcarbonate-clastconglomeratesandstoneandshaleVVcarbonate-clastgraywackeandmudstoneVcarbonatiteEchertVWWW`WbWeWfWW)WchertandargilliteVchertargilliteandlimestonefVchertchertytuffargillitecrystal-lithictuffvolcanicbrebVchertybWlithictuffvolcanicbrebVchertybWbWbWchertybWbWchertybWbWbWPWitnaPWPWPWLVLVLVLVtaltuffargillitechertgraywackeandLVLVkeandLVLVchulitnasequencelimestoneandbasaltsequenceMVMVsequencelimestoneandbasaltsequenceMVMVenceMVMVasaltsequenceMVMVMVMVbVcrystal-lithicbWdacite`WdeepRW?hillsWW0Whypabyssal^WoWpWWigneousWigneous-clastWWinnokoeWinnokoassemblagechertargilliteandvolcaniclasticrockseVseVeVasticrockseVeVeVeVeVeVeVeVeVeViViViViViViViViViViViViViViVinnokoassemblagegraywackegVgVgVgVgVgVgVgVgVgVgVinnokoassemblageultramaficandmaficrocksundividedaVaVaVaVblageultramaficandmaficrocksundividedaVaVaVinnokoassemblageultramaficandmaficrocksundividedaVaVaVaVaVaVaVaVaVaVssemblageultramaficandmaficrocksundividedaVaVdaVaVaVaVassemblageultramaficandmaficrocksundividedaVVVundividedaVVividedaVVicandmaficrocksundividedaVVVmblageultramaficandmaficrocksundividedaVVVVVVVficandmaficrocksundividedaVVidedaVVmaficrocksundividedaVaVdaVaVu\prWpre-datesWEWFWpre-frasnianWpre-mid<W@WAWBWCWpre-ordovicianWWWWWaryVWpreacherWprecambrianWpreciselyWWpredominanceWpredominantcWWWpredominantlyUWSWWW7W8W9WWWWWWWWpredominantlyfluviatileandalluvialcarbonaceousmudstoneUVpredominantlyveryfinetomedium-grainedmediumtomedium-dSVpredominatecWprefer_WpreferredTWprehniteVWprehnite-pumpellyiteWW Wpresence_W WWpresentkWOWRW[WeWfWgW2W3WJWVWWWWpreservedWWWWUWhWiWWWWWWWWWWWpressDWEWKWLWMWNWWWWWWW W!W"W#W$W%W&W0WtWuWWWWWWWWWWWWWWWWWWWWWpresumablypWpresumedWWjWpreviousWW/"bodies^WbrecciabWWca:W;WcalcWW,W-W.W:W;W<W@WAWBWCWEWFWcalcschistquartz-micaschistandgreenstoneVwellformationsedimentaryrockssubunitOVcarbonatiteEcataclastiteWchert W<WchickaloonUWchickaloonformationUVchinitnaWWchinitnaformationVchinitnaformationtuxednigroupandcoevalsedimentaryrockVchitina(W)W*W+W,Wchitistone5Wchitistoneandnizinalimestonesundivided5VchulitnaJWcoal-bearingMWNWcoal-bearingrocksMVNVcoevalWcomplexdW0WcomplexesyWcompositionrWsWconglomerateYWoWUWVWWWXWYWWW:Wconglomerateandvolcanicsandstone:VconglomerateoftheorcagroupYVconglomeratesandstoneandligniteoVconglomeratesandstonesiltstoneshaleandvolcanicrocksVcreek_WcW WWWcrystalbWcrystalandcrystal-lithicash-flowtuffbVcrystal-lithicbWdacite`WdeepRWA/andesitecWpWxWoWWandesiteandbasaltlavaflowsandvolcaniclasticrocksxVoVVandesiteandbasaltlavaflowsandvolcaniclasticrockstaacVandesiteandbasaltlavaflowsandvolcaniclasticrockstkapVeandbasaltlavaflowsandvolcaniclasticandrelatedoVoVVgeultramaficrocksUVareaWargillaceousWargillite WKWLWcWdWeWfWWWargillitechertsandstoneandlimestone VargillitesiltstonesandstoneandminorconglomerateVassemblageQWRWSWTWUWVWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWhWiWassociatedEWFWhWGWHWIWaugenWWWbarrenWbasaltDWEWFW]WcWpWJWMWPWVWWbasaltflowsFV]VbasementWWWWWbasinWbatholiths(W)W*W+W,WbayZWbeaverWbedrockBWbedrockofunknowntypeorageBVbedsNWbeltHWIWJWbendWdippingAWdirectionWdirectionsWdiscernibleW1Wdiscoidal]WdiscontinuousWWIWdiscordantWWdiscussedWWssedWWWWdismemberedWWPWWWberedPWWWWWdiscreteWdiscussedWWdismemberedPWWWmberedPWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWdPWUWWWWWWWWWdisplay@divided@+dolostone@{dominantlydarkgraytypicallyphylliticsiliceoustocarbon@dover@dsl@udutro@easternZ(eastward@ elevation@erosion@exposed@extrusive@famennian@faulted@Ufeatures@*finetocoarse-grainedsandgreatkobukandlittlekobuksan@fine-grainedtogrittygraywackeandlaminatedmicaceousmud@folded@istosesedimentaryrocksofunithgsofthe@folded@entaryrocksofunithgsofthe@flysch@FBAQuartz-mica schist and lesser amounts of calc schist, quartzite, graphitic schist, chlorite schist, and quarto-feldspathic schist. Polydeformed greenschist-blueschist-facies characterized by quartz-muscovite-chlorite-albiteglaucophane assemblages. A relict epidote-amphibolite metamorphic assemblage suggests that, at locally, the unit underwent a pre-mid Devonian metamorphic event. Unit is interbedded with carbonate rocks of unit |ca and therefore is, in part, Paleozoic in age. HoweveBr, in the Baird Mountains quadrangle, unit is intruded by Proterozoic granitic rocks of unit PzZi, and therefore is locally as old as Proterozoic. K/Ar isotopic analyses of the schist yielded Early Cretaceous metamorphic mineral cooling ages CPzZsaDPaleozoic and ProterozoicE*Pelitic schist, calc schist, and quartziteXFBlocally is interlayered with carbonate rocks of unit |cr and therefore is, at least in part, Paleozoic in age. However, some of the unit may be as old as Proterozoic. The regional metamorphism clearly pre-dates the widespread intrusion of the Early Cretaceous granitic bodies of units Kgr and Ksy. Metamorphic minerals in this unit in the Nulato quadrangle yielded K/Ar isotopic cooling ages of 134 and 136 Ma CPzZsrDPaleozoic and Proterozoic?E*Pelitic schist, calc schist, and quartziteA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4GA864113BWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWW1973W1998BWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWV1989#W$W%W*W/W1998BWvWAWDWWDWV1989#W$W%W*W/W1998BWvWAWDWWDWWDWVV1989#W$W%W*W/W1998BWvWAWDWWDWV1989#W$W%W*W1998BWvWAWDWWDWWDWIWIWIWWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWIWWIWIWIWIWIWIWIWIWIWIWIWIWIWIWWIWIWIWIWIWIWWIWIWIWIWWIWIWIWIWIWWIWIWIWIWIWIWIWIWIWIWIWIWWIWWIWM]ostracodWWWWWWWherBWCWDWEWGWHWMWNWTWWKWLWNW_WfWgWWWW W-W.W7W8W9WDWFWGWHWIWKWLWRWSWTWYWZW[W\W]WbWjWkWlWmWnWothersAWDWEWHWMWNWPWQWSWTWVWZW[W\W]W^W_W`WbWcWdWeWfWgWiWjWlWmWoWpWqWuWvWwWxW}WW@WAWBWEWFWGWHWIWJWKWLWMWNWOWQWRWSWTWUWWWXWYW_W`WaWcWeWfWgWhWWWWWW W W WWWWWWWWWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W-W.W/W0W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWEWGWHWIWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W_WaWbWcWdWeWfWhWiWkWlWmWnWoWpWrWtWuWxWyWzW{W|W}W~WtimeWtimingWWWWWWWWWWinaWWWWtintina-kaltagAWtithonianWKWLWtjds_WtkbHWtkggGWHWIWJWtkgs@WtkvbWuWvWwWtkvdpWqWtkviiWjWkWlWmWtkvroWtkvtpWqWtmmWtmgfWtnepfWtoAWDWEWGWHWKWLWPWSWVWXWYW[W\W^W_WaWbWcWdWfWgWlWnWuWvWwWzW|W}WW@WAWBWEWFWGWHWIWJWKWLWNWOWPWQWRWSWTWUWWWXWYWZW[W\W]W^W_W`WaWbWcWdWeWfWgWiWjWkWlWmWoWpWqWrWsWtWuWvWwWxWyWzW{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@WAWBWCWGWHWIWJWKWLWMWNWOWQWUWWWhardXWWWhardfine-grainedtoconglomeraticlocallytuffaceousgraywaXVharzburgiteXW[WW W!W"WhasAWXW'WWWWWWWWDWDWDWDWDWDWDWDWWDWDWWWWWWWWWWWhasenWWnWWhasenWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWsenWWWWWWWWWWWWWWWWWWWWWWWWWWWW1stabilizedWWsubordinateWWsurficialCWWWWsurficialdepositsundifferentiatedCVVVVsyenitesWWWsyeniteandmonzonitesVsyenitemonzoniteandnephelinesyeniteVsyenitemonzoniteandnephelinesyenitenephelinesyeniteunVtacWtdcWtelsitnaWtheWWW0WtholeiiticEWtholeiiticbasaltconesandflowsEVtidalWWWtkapWtkdpWdpWdpWdpWdpWdpWdpWdpWdpWdpWdpWdpWtkapWtkdpWdpWdpWtkdpWdpWdpWkdpWdpWWdpWdpWtkdpWdpWtkdpWdpWdpWdpWkdpWdpWtkdpWdpWdpWdpWdpWdpWpWpWdpWpWdpWdpWdpWdpWdpWdpWWtkapWtkdpWdpWWtkdpWdpWdpWdpWdpWdpWdpW_W`WtozitnaassemblagenorthgreenstonechertandultramaficrocWVtozitnaassemblagenorthmaficandultramaficrocksXVtozitnaassemblagenorthsedimentaryrocksYVtozitnaassemblagesouthmaficandultramaficrocksundivide^V67maficWWWWXWZW^WWmaficandultramaficrocksVVmaficigneous-clastconglomeratesandstoneandmudstoneWVmafic-ultramfic[WW W!W"Wmafic-ultramficcomplexes[VV V!V"VmarineRWSWUW\WW W Wmarinesandstoneandsiltstone\V\Vone\V\V\V\Vne\V\V\Vne\V\V\Vndsiltstone\V\Ve\V\V\V\V\V\V\Vstone\V\V\V\V\V\V\Vltstone\V\Vone\V\V\V\V\V\V\V\V\V\V\V\V\V\VationQVQVWmatanuskaformationQVVVVE/smallMWsmalldepositsofnonmarineconglomeratesandstoneshaleandMVsouthZW^Wspiculite6Wspiculiteandsandylimestone6VspiliticvWspiliticbasaltanddiabasevVsprucecreeksequenceandcorrelativerocksVksVVVVVVVVVVVVVVVVVVVVVbordinateTWsubunitOWsubvolcanicrWsWsurficialCWsurficialdepositsundifferentiatedCVtalkeetna4Wtalkeetnaformation4VtatinakWlWmWnWtelsitnaWterraWtetelnaWWWWtheXWYWZWdWWHWIWJWeWfWgWhWWtohWyWtolovanaWWtolovanalimestoneVVtonalitehW|WtozitnaWWXWYWZW[W\W]W^W_W`WtozitnaassemblagenorthgreenstonechertandultramaficrocWVtozitnaassemblagenorthmaficandultramaficrocksXVtozitnaassemblagenorthsedimentaryrocksYVtozitnaassemblagesouthmaficandultramaficrocksundivide^VfrelatedvWrhyolite^WcWoWpWvWpWWWrhyoliteandrelatedrocksvVrhyolitedaciteandtrachytelavaflowsandvolcaniclasticrpVVVpVpVpVpVpVpVpVpVndsedimentaryrocks\VridgeWWriverkWlWmWnWWrocks\WcWoWpWsWvWxWAWCWDWEWFWiWjWkWlWmWnWoWpWqWrWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W7W8W9W=W>W?W@WAWBWCWGWHWIWJWOWQWUWWWXWYWZW[W\W]W^W`WaWdWeWfWvWwWxWyWzW{W|W}W~WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWrubyWWWWWWWWWWWWWWWWWWWWWWWbnlargelydaciteandesiteandbasaltandsubordinateandesitickVlargelygraniticbutrangefromtourmaline-bearinggranitetuVlargersWWWWJWlateRWSWUWVWXW]WnW6WVW[W`WcWWWWWWWWWWW W W W WWWWWW W!W"W)W1W2WIWKWLW2W2W2W2WlaterWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W WWWWWlaterWWWWWWWWWWWWWWWWWWWWWWWWWWWWW WWWWWlaterWWWWWWWWWWWWWWWWWW|least@leucogabbro@lighttodark-grayveryfinetomedium-grainedwell-sortedq@`light-gray@light-weathering@limited@livengood@local@locallymappedunitconsistingofunitskjwcandkwcfinthe@ilow-grade@lowerpartofalternatinggreenandmaroonlimemudstonesuc@mafic@magmatic@main@malignite@mapped@Lmapped@d@pedonlyinreconnaissancebutpresumedtoconsistofsom@{inreconnaissancebutpresumedtoconsistofsom@{{boundedexposureatbroadpassjusts@{appedonlyinafaultboundedexposureatbroadpassjusts@{?y1A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.42A5745AFine- to medium-grained, commonly calcareous graywacke and granule conglomerate, which contain clasts of chert, shale, argillite, and volcanic rocks. Graywacke and conglomerate are interbedded with argillite. Unit contains microfossils and bryozoan and echinoid fragments assigned to a Permian(?) age in the Ruby quadrangle and assigned more generally to a late Paleozoic age in the Ophir quadrangle. Unit appears to interfinger locally with unit TrDc CTrMgDTriassic? to Mississippian?EGraywacke, grit, and argillite 0melangemeta-quartzWmetabasiteW&'(metabasitemzzmaandfelsicschistdfundividedVmetagraywackeWWmetagraywackeandsubordinatephylliteVmetagraywacke-clastVWmetamorphicAWWWWWWWWWWWWWWWWWWWWWmetamorphicbasementrocksofthenixonforksequencecalc-sVVVVVVrphicbasementrocksofthenixonforksequencecalc-sVVlc-sVVtrocksofthenixonforksequencecalc-sVVVxonforksequencecalc-sVVVVVVVncecalc-sVV-sVVcksofthenixonforksequencecalc-sVValc-sVVequencecalc-sVVVsequencecalc-sVVVmorphicbasementrocksofthenixonforksequencecalc-sVVVcksofthenixonforksequencecalc-sVVc-sVVVVVsementrocksofthenixonforksequencemetavoVenixonforksequenceundiviVmetamorphosedWHcomprisesDWconcretions]WcondontsfWconesDWconeyWWconfinedcWconfinedtowest-centralpartofmelozitnaquadranglewherecVconformablynWconglomerateMWoWSWUWVWWWYW_WaWoWpW6WbWcWvWWWWWW W W WWWWWWW2WKWLWW3W3W3W3W3WW2W3W3W3W3W3W3W2W3W3W3W3W3W3W3W3W3W3WW2W3W3W3W3WW2W3W3W3W3WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWominor`Wmonzonite<sWWWmountainWmudstoneWWXW`WnWWWWmzzmaWWmzzmaWWrWqWrWrWuWuWuWuWrWuWuWuWuWuWrWtWuWuWysticjWnWoWpWqWrWtWuWuWWrWtWuWuWuWuWuWuWuWuWuWuWuWWqWrWtWuWuWuWuWnWoWpWqWrWtWuWuWuWWmWnWoWpWqWrWtWuWuWuWuWuWuWuWbRA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4A2023AComplexes are composed of small, closely-spaced rhyolite, dacite, andesite, granite, granodiorite, tonalite, and monzonite porphyry bodies, which intrude Cretaceous sedimentary deposits of the Yukon-Koyukuk basin. Intrusive bodies are too small and too numerous to be mapped separately. Sedimentary host rocks are altered to an erosion-resistant hornfels. A felsic hypabyssal body belonging to the complex in the southwestern part of Unalakleet quadrangle yielded a single K/Ar isotopic cooBling age of 69 Ma CTKicDearly Tertiary and CretaceousWa€AFine- to coarse-grained sandstone, limy sandstone, sandy limestone, siltstone and shale. Sandstone ranges from clean quartz arenite to a lithic arenite containing as much as 25 percent muscovite and metamorphic rock fragments. Where unit unconformably overlies units Pzs and Pzc, it contains a basal conglomerate that has large clasts of calc schist, quartz-mica schist, and chlorite schist in a micaceous and sandy matrix. Unit locally contains an abundant Permian brachiopod fauna.CPsDPermianE+Sanstone, sandy limestone, and conglomerateA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4F{sedimentary\WYWZWvWWWWsedimentaryrocksVsedimentaryrocksundividedvVsequenceWWWWWWWWWWWserpentinitePWPWPWPWPWPWPWPWPWPWPWPWPWPWinitePWPWPWPWseventymileassemblageultramaficrocksQVcrocksQVQVseventymileassemblageultramaficrocksQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVQVVQVQVQVQVileassemblageultramaficrocksQVVVVVVVtohWyWtonalitehW|WtrondhjemiteW'tsadakaOWPWtsadakaformationPVtsadakawestforelandandwishboneformationsundividedOVtuffbWpWqWKWLWtuxedniWWtuxednigroupVtyonekKWtyonekformationKVtypeBWultramaficEWFWhWWWWWWWWWWW W!W"W#W$W%W&WQWindeterminateWindeterminateorpoorlyidentifiedunitsinlivengoodquadraVindicateUWWWWWWW WGWindicatedVW)WindicateseWWindicativeWinferredWinformal^WeWWWWWeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmmetasedimentaryWWZWWWGWmetasiltstoneBWWmetasomatized'W0WmetatuffYWmetatuffYWYWYWYWYWmetatuffYWYWYWuffYWYWWWWWWWWWWWWmetasomatized'W0WmetatuffYWWWWWWWWWWWWWWWWWWWWWWWWYWWWWWWWWWWWWWW.WWWWWWWWWWWWWWWWWWWWWWWWmetavolcaniclasticGWHWIWmeteorHWIWJWmetersW=W>W?W@WAWBWCWKWLWxWWWWmgWWmgbWWWWmgshGWmhaWWWWWWWWWWmiZWmica@WHWIWJWEWJWWWWWWmicaceousUW[WWWWmicriteWmicritic;WWWWmicrofossils;WgWmid-cretaceousQWdW W7uncertainwWundifferentiatedCWWWWWundifferentiatedCWWWWWWWWWWdifferentiatedCWWWWWWWWWWW#granite,{W~WWWWgraniteandgranodiorite{VVVgraniticuWwWW7WDWgraniticgneissV7VDVgraniticrocksuVgraniticrocksofuncertainaffinitieswVgranodiorite{W~WWWWgranodioriteandgranite~VVgravelWgraywackeXWYW`WnWVWcWWWWW)W2WgraywackegritandargillitecV2VgreenstoneWWWWWGWgrit_WcWWW2W2W2W2WWWWWWWWWWWWWWWgritcWWWWWgrittyWWWWWWWgrittyWWWWWWWgrittyWWWWWWWWWWgrittyWWWWWWcWWWWWgrittyWWWWedimentaryrocksVVhornblende`Whornblendedacite`Vhypabyssal^W_WtWhypabyssalfelsicandintermediateintrusiverocks^VhypabyssalgraniteporphyrydikesandrhyoliticsillsandpltVhypabyssalmaficintrusiverocks_VigneousWWeunknownBWAWzWunpublished\WWWWvWWWWWunroofingVWunsorted_WWWIWupperXWoW6WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWuppermemberdominantlythin-beddedveryfine-grainedspicul3V3V3V3V3V3V3V3VV3V3V3V3V3V3V2V3V3V3V3V3V3VV3V3V3V3V3V2V3V3V3VV2V3VVV3V3V& :andWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWW)W,W-W.W2W:W;W<W@WAWBWCWEWFWGWHWIWJWKWLWGWGWGWGWGWGWFWFWHJrelated@2rhyolitehypabyssalbodies@frubymetamorphiccomplexmetamorphosedmaficigneousrocks@sandstone@Fsedimentary@;shale@shallow@vsilicic@Esmall@1stabilized@/tolovana@tozitnaassemblagesouthmaficultramaficandsedimentaryro@uncertain@>>sedimentaryro@uncertain@>aficrocksundivided@>vided@>ided@>cksundivided@0N\plagioclase^WlWoWxWRW]WoW'WWWW WWplainSWWWWWWWWWWKPpillow`Wpillowbasaltchertandminoragglomerate`VpossiblyWtchertandminoragglomerate`VpossiblyWWlyWWWsiblyWWWpossiblyWWtandminoragglomerate`VplutonWWpossiblyWWWWG.ANQuartz-muscovite-graphite schist, calc schist, quartzofeldspathic schist, phyllite, and quartzite. Unit is locally interlayered with unit |cs and is therefore, at least in part, Paleozoic in age. Some of the unit may be as old as Proterozoic. Samples of the schist yielded a metamorphic mineral K/Ar isotopic cooling age of 124 Ma NCPzZssDPaleozoic and Proterozoic?E*Pelitic schist, calc schist, and quartziteA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003/A5500BeGrayish-green or greenish-gray fine-grained quartz-muscovite-chlorite schist and mica-quartz schists.CPzqmsD PaleozoicEQuartz-mica schist;^sandstoneMWRWSWUWVWWW\W]WaWW W W W WWWWWKWLWsandy6WWsanstoneWsanstonesandylimestoneandconglomerateVschist_WWWWWWWWW,W-W.W:W;W<W@WAWBWCWEWFWGWschistphyllitelimestoneandgreenstoneVVVVVVVlimestoneunitVVVVVVVVVJ €A5310AWhite, medium- to coarse-grained marble occurring as massive lenticular interbeds, as much as 30-m-thick in the Strelna metamorphic complex in the Talkeetna Mountains quadrangle (units Jmrb, Jmb, and Pls Csejtey and others, 1978) and marble within the Skolai Group in the Valdez quadrangle (unit Pzm, Winkler and others, 1980; unit ma, G.R. Winkler, written commun., 1998). In the Talkeetna Mountains quadrangle, the protolith may have been limestone within the Talkeetna Formation (unit Jtk) BfXfor] geologic[geologicalh@7,in@integrated'[investigations@wjr@'k@ labay@map@hnora@of@L!Pp@Ipatton]$ap@hnora@'of@L!Pp@Ipatton]$$n]$^Ipatton]$^Ipatton]$of@L!Pothers@^Ipatton]$Ipatton]$prep@rqreconnaissance@report@Jscale:scientificshew@ostates@Zthe@=_up{[iwVowilsonsq*wilsonandothers1998dogmap@uq.yukon-koyukuk@HquadrangleWWWWWWWWWWWWWWWWWWW W WWWWWWWW)W,W0W2W<W@WAWBWCWEWFWIWKWLWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWFWCWCWCWCWCW9W9W9W9W9W9W9W9W2W2W2W2W2W2W2W2W0W0W0W0W0W0W0W,W)W#WWG €AjDeep-water deposits of finely laminated limestone and dolomitic limestone. Subordinate chert and siliceous siltstone. Formation was originally assigned an Ordovician to Devonian age on the basis of a sparse conodont fauna (Dutro and Patton, 1982. More recent work, however, indicates that it also contains conodonts of Cambrian age (Dumoulin and others, 1997) jCDCdDDevonian to CambrianEEast Fork Hills FormationA3Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,0003€A7581F Wilson and others, 1998 (DOGmap)DnonmarineMWnorthWWXWYWnoviWnovimountainandtelsitnaformationsundividedVofBWMWsWwWWWWWWW0WJWoffshore]Woffshorecalcareoussandstonesiltstoneandshale]VorBWparadiseWparadiseforkformationVpeliticWW,W-W.W:W;W<W@WAWBWCWEWFWGWpeliticschistcalcschistandquartziteV-V.V<V@VAVBVCVEVFVpeliticschistcalcschistandquartzitepzzssandcarbonate,Vpeliticschistcalcschistandquartzitesaandcarbonatero:V;Vpeliticschistquartzitequartzo-feldspathicgneissandgreeVGVphylliteWWW1phylliteandsubordinatemetagraywackeVaywackeVVkeVVVVVVVVVVVVVVeVVVVVVW1phylliteandsubordinatemetagraywackeVVVWWWWWWWWW_WWWWWWWWWWWy]mapped\WvWyWYW\WkWWWW WvWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW ,ordovicianVWWWWWWW)W+WorientationWoriginAWWWoriginalWWoriginally_WeWWWWorthoclase^WlWWlWWlWWlWWlWWlWWlWWlWWlWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWCNpillowvWYW`WWpillowedWpinkvW'WplacesYWWWWWWWWWWWWWWWWWWWWWplafkerWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWthin-bandedeWdedbufftoorange-weatheredlighttomediuthin-bandedeWeWfWfWnduratedconglomeratecontainingthin-bandeddWeWfWfWtedconglomeratecontainingVthin-bandeddWeWfWfW%€A8601AQuartz-mica schist, chlorite schist, quartzofeldspathic schist, quartzite, and micaeous and graphitic schist. Regionally metamorphosed to greenschist-facies, but also locally includes high-pressure greenschist-blueschist-facies (distinguished by the presence of glaucophane) and amphibolite-facies (distinguished by the presence of sillimanite and kyanite). Andalusite-cordierite hornfels and contact schist occur in broad bands around Cretaceous granitic bodies of units Kgr and Ksy. Unit the presence of glaucophane) and amphibolite-facies (distinguished by the presence of sillimanite and kyanite). Andalusite-cordierite hornfels and contact schist occur in broad bands around Cretaceous granitic bodies of units Kgr and Ksy. Unit Q2 digitalWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W W W Wv €A6960AShallow-marine limestone and dolostone facies having reported algal reefs. Middle Devonian to Middle Cambrian age range indicated by trilobites, conodonts, corals, stromatoporoids, and brachiopods; an unfossiliferous dolostone unit below Middle Cambrian strata has been assigned to Late Proterozoic (St. John and Babcock, 1997). Map distribution compiled from Miller and others (1989), Bundtzen (unpublished data, 1998), and Decker and others (1994). Locally includes the following units: DSBwc, Spf, Ont, CZdsCDZnDDevonian to Late ProterozoicEUNixon Fork sequence: Shallow-marine carbonate units of Holitna basin area, undividedF Wilson and others, 1998 (DOGmap)€A6960n Fork sequence: Shallow-marine carbonate units of Holitna basin area, undividedF Wilson and others, 1998 (DOGmap)€A6960; &nelsonWnephelineWWWWWWbandedbWWWWbandedchertargillitefine-grainedthin-beddedlimestoneanVbandedfine-grainedfoliatedfelsicvolcanicrockschieflypVbandsWWW0WEWFWbankMWbarchan-likeWbarremianaWnWbasalWWbasaltDWEWFW]WpWxWkWoWvWVWWWYWZW`WzWWWWWWWW)WbasaltgabbrodiabasebasaltictuffandchertmayincludemiZVbasalticxWkWvWZWeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWbasalticandesiticandrhyoliticflowstuffandbrecciaandVVVVVdesiticandrhyoliticflowstuffandbrecciaandpVqVqVqVVVVqV-datedWWZWdebrisVWWW]W`WaWoW6WWWWWWWWWdebris-flowWdeep-waterWWWWdeep-waterdepositsoffinelylaminatedlimestoneanddolomiVdeep-waterturbiditicandhemipelagicdepositsofdarkthin-VdeflationaryWWdeformationWonWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWv €A6620allow-marine limestone and dolostone comprises the upper third of the Nixon Fork stratigraphic sequence in its type area in the Medfra quadrangle. Age range is based on conodonts, stromatoporoids, corals, and ostracodes. Depositional setting interpreted as shallow marine. Includes Whirlwind Creek Formation in Medfra quadrangle (Patton and others, 1980; Dutro and Patton, 1982), unit DSl in the Mt. McKinley quadrangle (Bela Csejtey, Jr., written commun., 1993), units lDl, lDd, mDl, SLa,B and SDlw in the western McGrath quadrangle (Bundtzen, unpublished data, 1997), and unit SDlw(h) in the western Lime Hills quadrangle (Bundtzen, unpublished data, 1998)CDSwcD;Late Devonian, Frasnian through middle Silurian, WenlockianEMNixon Fork sequence: Whirlwind Creek Formation and unnamed correlative unitsF Wilson and others, 1998 (DOGmap)€A6620Y:€Cdant conodont, brachiopod, and coral fauna. It was originally assigned a Middle and Late Ordovician age by Dutro and Patton (1982), but subsequent investigations by Dumoulin and others (1997) indicate that it ranges from Early to Late Ordovician COntD OrdovicianE0Novi Mountain and Telsitna Formations, undividedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A5740Udark-grayXW\W]W_W`WWWWeWzWWWWWWW6W6W6W6W6W6W6WWWWWWWWWWWW4W6W6WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW€ANovi Mountain Formation: Shallow water deposits. Predominately calcareous siltstone and shale in lower part. Upper part characterized by cycles beginning with massive limestone commonly containing flat carbonate pebbles at the base and grading upward through thin irregularly bedded shaly limestone into calcareous siltstone or shale at the top. The formation contains a sparse Early Ordovician conodont fauna. Telsitna Formation: Chiefly shallow water limestone and dolomite. The lower paBrt dominated by highly fossiliferous thin-bedded fine-grained limestone containing silty interbeds. Middle part consists chiefly of nonfossiliferous dolomite. The upper part is composed mainly of limestone that ranges from thick bedded and fine-grained to thin-bedded and silty. Stringers and nodules of black chert occur near the top. The upper part locally is characterized by platy dark limestone containing conodonts indicative of deep-water deposition. The formation contains an abunobsidianWobsoleteWobsoletemapunitVobtainedVWoccurMWAWVWoWVWWWZWWWWWW)WEWFWIWoccurs]W_W'WZWWW4WoclsWWWWreaineasternlimehillsquadrangleimpooclsWodWWWWodWWWWWodWWWodWWodWWWodWWWWWWWWWdWWWWWWWWWWWWWWWodWWWWWWWWWWodWWWWWWWWWWodWWWWd westernWW,W,W,W,W,W,W`muscovite]WWWWW7Wmuscovite-biotite{WWWmuscovite-rich]WmuskoxWWWWWWWWWWWWWWWWWWWWWWmzpzdyWzW{W|W}W~WmzpzgyWzW{W|W}W~WmzpziyWzW{W|W}W~WmzpzmyWzW{W|W}W~WmzpzpWWmzpzs/WWWWmzpzuWWWWWWmzpzumWWWWWWmzs WWWWmzsaHWIWJW Wmzu WWWWmzvWWWnagao WnaknekbWWWname4WnamedWnarroweWKWLWnasinaWWnationWWWWnature WxWnearkWGW[WoWpWqW1WKWLWWWWWWWWWWWWnearlyEWFWnecessaryZWnegondolella7W8W9WnelchinabWnelsonhWlWmW W WkWlWmWnWpWtWuWyWzW{W|W}W~WWWWWWWW,x:otherBW_WWWWYWZWWW&W&W&W&W&W&WWW&W&W&W&W&W&W&W&W&WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWNWPWQWSWTWVWZW[W\W]W^W_W`WbWcWdWeWfWgWiWjWlWmWoWpWqWuWvWwWxW}WW@WAWBWEWFWGWHWIWJWKWLWMWNWOWQWRWSWTWUWWWXWYW_W`WaWcWeWfWgWhWWWWWW W W WWWWWWWWWWWWWWWWW W!W"W#W$W%W&W(W)W*W+W,W-W.W/W0W5W6W7W8W9W:W;W<W=W>W?W@WAWBWCWEWGWHWIWKWLWMWNWOWPWQWRWSWTWUWVWWWXWYWZW[W\W]W_WaWbWcWdWeWfWhWiWkWlWmWnWoWpWrWtWuWxWyWzW{W|W}W~W€B5Metabasite (MzZma) and felsic schist (Df), undivided CMzZfmDMesozoic? to Proterozoic?E5Metabasite (MzZma) and felsic schist (Df), undivided A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4~granite^WlWsWyW{WuW~W'WWWWWWWWWW7WDWJWgranitegranodioritedioriteandgabbrothathaveaslighttDVgraniticUWWWXW`WuWwWWWW WW<W@WAWBWCWEWFWGWgranodioritesWyWuW~W'WzWWWWWWWWDWJWgranodioriteofrainbowmountaininthemounthayesquadrangzVgranularxWgranulecW2Wgranules_Wgranulite[WWW W!W"W"W"W"W"W"W"WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlighttodark-grayveryfinetomedium-grainedwell-sortedqVVVlighttomedium-greenchloriticschistlighttomedium-grayVlight-brownWlight-brownweatheringcalcareousschistinterbeddedwithgrVt-brownweatheringcalcareousschistinterbeddedwithgrVVuWuWiticschistlighttomedium-grayVlight-brownuWW: €A5560inly and rhythmically interbedded dark-gray argillite and platy, laminated, gray siltstone. Very fine- to fine-grained, gray, chert-rich, turbiditic sandstone. Quartz- and chert-bearing granule- to pebble conglomerate, locally calcareous and fossiliferous. Foraminifera, conodonts, and brachiopods indicate a Permian age (Weber and others, 1992). Mapped in the Livengood quadrangle. In the Tanana quadrangle, equivalent rocks are part of unit TRPsCPsDPermianE7Argillite, siltstone, sandstone, and minor conglomerateF Wilson and others, 1998 (DOGmap)€A5560turnWWturonianUWW WtwinnedWtwoEWkWEW[WeWvWWWWWWWW W!W"WDWGWtwomembersonelargelyvolcaniconelargelysedimentaryvolVVVVVVVVtwo-holedWWWWWWWWWelyvolcaniconelargelysedimentaryvolVtwo-holedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWe €A5615determinate or poorly identified units in Livengood quadrangle. Black and greenish-gray siliceous slate, thinly interbedded gray chert, shaly chert, and minor breccia, siliceous, locally sandy siltstone displaying turbiditic sedimentary structures, red and greenish-gray, or dark-gray, locally calcareous shale, phyllite, minor quartz- sandstone, argillite, greenstone, lime mudstone to packstone, and limestone debris flows. Conodonts from a limestone clast in one debris flow indicate a LBate Devonian (Famennian) age (Weber and others, 1992). Includes units PDms and Pzs in the Livengood quadrangle (Weber and others, 1992)vCPDmsDPermian? to Devonian?ESedimentary rocksF Wilson and others, 1998 (DOGmap)€A5615[/wehrlite[WW W!W"Wwelded\WvWWwellUWW Wwell-developedEWwell-preservedUWW Wwell-roundedVW_WWWwell-sortedVWWWWwereXWkWeWWwerhliteXWwest\W`Wwest-centralcWwestern\WWWW'W^WeWeWeWeWeWeW'W^WeWeWeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWnWoWpWrWWWWWWWWWWWcg€AIndeterminate or poorly identified units in Livengood quadrangle. Black and greenish-gray siliceous slate, thinly interbedded gray chert, shaly chert, and minor breccia, siliceous, locally sandy siltstone displaying turbiditic sedimentary structures, red and greenish-gray, or dark-gray, locally calcareous shale, phyllite, minor quartz- sandstone, argillite, greenstone, lime mudstone to packstone, and limestone debris flows. Conodonts from a limestone clast in one debris flow indicate a LBate Devonian (Famennian) age (Weber and others, 1992). Includes units PDms and Pzs in the Livengood quadrangle (Weber and others, 1992)vCPDmsDPermian? to Devonian?ESedimentary rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.€A6530lsub-basin`WsubaerialSWWsubaerialcolumnar-jointedandesiteandbasaltlavaflowsthVsubangular_Wsubdivided_WvWsubmarineXW`WWWWsubordinate|WUWVWWWXWkWvW'WWW^W_W`WeWfWvWWWWWWWWWWW WWWW+W1WGWsubsequentWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWntWWWWWWbsequentWW1W+WWW+W+W+W+WWW+W+W+WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWsubunitWWWWWemS€ALight gray, massive or thinly laminated quartzite and medium- to dark-gray slate, phyllite, and laminated claystone. Unfossiliferous; age inferred on the basis of intrusion by Triassic rocks and by lithologic and stratigraphic similarity with the Keno Hill quartzite of Yukon Territory, Canada (Dover, 1994). Associated with gabbroic dikes and sills. Occurs in the White Mountains and Schwatka stratigraphic belts in Livengood and Tanana quadrangles and has limited exposure in the Circle quB0adrangle (F.R. Weber, unpublished mapping, 1998)CMgqD MississippianEGlobe quartziteFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.eomedium-darkeWmedium-dark-grayAW_Wmedium-grainedRW_W~WWWWWWcWWWW WWWW2Wmedium-gray\W_WWWWWWWmedium-greenWmedium-lightWWWmedium-scale_WmegacrystsWmegafossilsVW)WmelangeWmelangeconsistsofblocksofcarbonaterockschertmetagrayVmelozitnaMWcWvW`WuWWWW`WuWWWWWcWvW`WuWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmembersKWMWNWWkWlWmWnWrWWWWmentionWWWmertiegWmesozoicWWWWWWWWWlocallymappedunitconsistingofunitskjwcandkwcfinthe VlocatedMWlongitudinalWlowWWZWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWk€AUndivided assemblage of: 1) biotite granite and granite gneiss including augen gneiss, 2) quartzofeldspathic schist, quartzite, pelitic schist and amphibolite metamorphosed to upper amphibolite to lower granulite facies, and 3) marble and calc-silicate rocks. Field data are insufficient to map separately the complexly interrelated lithologic components of this unit. The granite and granite gneiss yielded a Cretaceous U/Pb isotopic zircon crystallization age of 118 Ma and CretaceousB K/Ar isotopic cooling ages of 110 to 120 Ma. The schist, quartzite, and carbonate rocks probably are correlative with units PzZsr and Pzcr of Paleozoic and Proterozoic(?) age CMzZkcDMesozoic to Proterozoic?EComplex of the Kokrines Hills jQ€A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4BYareaFW\WvWUW_W`WkWWWZWWWWWWW W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W,W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WWWWWWWWWWWWWWW correlates^Wcorrelation`Wcorrelative]WWWWW W WW0W1W7WDWKWLWcorrespondsYWZW^WeWWWWcoverDWEWWcoveringWWWWWWWWWWWWWWWWWWWWWWWWWWgWWWWWWWWWWWWWcoveringWWWWWWWWWWWWWveringWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWAcrockSWUWWWYW`WaWEWWWWWW WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWhmemberWmembersWmesozoicWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmr €A6910ay and green phyllite interlaminated with calcareous siltstone, quartzose sandstone, graywacke, and granule- to boulder conglomerate constitute the Quail unit of Weber and others (1992). Clasts in conglomerate include chert, dolostone, serpentinite, intermediate and mafic igneous rocks, quartzite, argillite, phyllite, slate, volcanic rocks, sandstone, and white quartz. At base are localized carbonate buildups of coral-bearing lime-mudstone and wackestone of Late Devonian (Frasnian) ageB (Weber and others, 1992). Slightly higher metamorphic grade than age and lithologically similar Cascaden Ridge unit of Weber and others (1992), here mapped as part of unit Dcb. Correlates with the Nation River Formation of the Charley River quadrangle (Brabb and Churkin, 1969)CDqDDevonianE Quail unitF Wilson and others, 1998 (DOGmap)€A6910 1969WWps€ARhythmically interbedded dark-gray to black cherty argillite to chert, and thin beds of black to gray, siliceous slate as mapped in the Livengood quadrangle. Associated with extensive mafic intrusive and extrusive rocks. Unidentified radiolaria are only reported fossils (Weber and others, 1992). Depositionally overlain by Frasnian carbonate buildups at base of Quail unit, hence Middle Devonian or older. Also includes unit Pzc in the Circle quadrangle, which consists of chert interlayerBed with argillite, and rare marble and quartzite, intruded by diorite and gabbro (Foster and others, 1983). Radiolaria from unit Pzc are not age-diagnostic but reported as "possibly of Mississippian age (Foster and others, 1983)"; this constraint is, however, less compelling than the pre-Frasnian age for the Troublesome unit in its type area. May correlate with the McCann Hill Chert of the Charley River quadrangle (Brabb and Churkin, 1969CDtrD Devonian?r9€E/Troublesome unit and possibly correlative rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.nd others, 1992). Interfingers with volcanic rocks of unit Dsv. Mapped only in northeastern Livengood and northwestern Circle quadrangles. Depositional environment interpreted as shallow marineCDsDMiddle to Early DevonianESchwatka limestone unitF Wilson and others, 1998 (DOGmap)merate, tuff, fine-grained volcaniclastic rocks, minor thin lenses of laminated platy impure limestone, and local lenticular bodies of calcite-cemented conglomerate (Weber and others, 1992) interbedded with limestone of unit Ds. Metamorphosed to greenschist facies. Mapped in Livengood and Circle quadranglesQCDsvDMiddle to Early DevonianEVolcanic part of Schwatka unit€A6955mississippianVWWWbWeWvWWWW&W)WmixedUW_WWWW Wmixedassemblageoflaminatedfine-tocoarse-grainedquartzi_VVmiyaoka_WmoderateDWmoderatelyAW]W_WmodifiedWWWIWmoffitWWmolluscanUWW WmollusksSWUWWWXWaWoW6WW WWWmonzodiorite|WsW~WWWWWW|WsW~WWWWWWWWWWWWWWWWWWWWWWWnzodiorite|WsW~WWWWWWWWWWWWWWWWWWWWeformedandlocallyhighlymonzodiorite|WsW~WWWW~WWWWWWWWWWWWe|W|W|We|We|We|We|Wiorite|W|WdslWWductileWductily0WdueWdumoulin_WWWWWduneWWdunesWWdunite[WW W!W"WduringWdusel-baconAWnAWAWAWAWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWeachkWlWmWnWeagleQWRWSWTWWearlierWWearliestWWearlyW@WBWEWFWOWQWoWpWqW W WWWWWWWWWWW W!W"W#W$W%W&W-W.W2W3W4WJWKWLWOWtWuWWWWWWWWWWWWWWWWeastcW@WGWTW_W W WWWWQWRWSWTWbWWWWeast-central0WWWeasternOWbWWWWWWWWRVG€AShallow-water deposits consisting of several repeated cycles. In the lower part of the formation the cycles grade from algal laminated dolomite into pelletoidal limestone and then into silty limestone and siltstone. In the upper part the cycles grade from thick-bedded reefy limestone into thin-bedded limestone. The formation contains an abundant Late Silurian and Devonian conodont, brachiopod, coral, and ostracod faunaCDSwDDevonian and late SilurianEWhirlwind Creek FormationA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 acontentWcontentsWcontiguousWcontinuesWcontinuousWcontinuum^Wcontinuum^Wm^Wcontinuum^Wm^Wm^Wm^WWm^Wontinuum^Wm^Wm^Wm^Wm^Wm^Wm^Wm^Wm^Wm^Wm^Wm^WWcontinuum^Wm^Wm^W]Rothers\WvWAWYW_W`WWWEWWWXWYWZW_WeWzWzWzWzWzWzWzWzWzWzWzWzWzWzW~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W~W<depositedRWWW WIWdepositionWWdepositionalWdepositionallyWdepositsBWCWMW]WyWSWUWXW\W]WWWWWWWWWWWWWWWWW WWWWWWWWIWderivation_WderivedWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWtlsilveryWsimilar\W`WWWeWWsimilarityWsingleyWWWsischuvWsize_W_W_W_W_W_W_W_W_W_WhuvWsize_W_W_W_W_W_W_W_Wze_W_W_W_W_W_WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW+dolostoneWWWdomalWdomeWWdomesoWpWsWWWWWJWdominantlyAWeWvWWdominantlyargillaceouscontainingdistinctivetan-weatherinVVVVVVVVVVVVVVVVVVVdominantlyclasticsequenceofpoorlysortedquartzitefeldsVVVfeldsVVVVVVVVVVVVVVVantlyclasticsequenceofpoorlysortedquartzitefeldsVVVVVVVeldsVVVVVVVVVaygarnetiferousquartz-mAVdominantlymedium-darktodark-graythin-bandedbeddedradiodVeVfVdominantlymetabasaltslateandotherlow-grademetasedimentGVHVIVdominantlypeliticandquartz-richschistinthehealyandmVVVdominantlypolymetamorphicquartziteschistosequartziteandVVVVVVdominantlyquartz-richandquartzofeldspathicparagneissquaVhydrothermallykWthermallykWkWlykWkWmWmWmWmWoseriesCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWsheetsBWvWAWDWWWYW_W`WkWuWWWWWW WEWWWXWYWZW^WeWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWvF{uvA2335BFine-grained, amygdaloidal, spilitic pillow basalt flows and medium- to coarse-grained spilitic diabase intrusive rocks. Contains subordinate andesitic and basaltic tuffs. Appears to overlie unit Kv and to underlie unit Krd CKbdDEarly CretaceousESpilitic basalt and diabaseA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4710SW'WW100]W105uW109WWWWWWWWWWWWWW109WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWxWyWzW{W|W}W~WWWWW110-120VW118WW120rWsWtWuWvWwWxWyWzW{W|W}W~WWWWWWW W!W"W#W$W%W&WWWW122WW123EWFWWW126EWFW129'W13.0aW1300-m-thickLW133W138UW1400-m-thickW148WW149'W15RW[W1500[W1500mUW151[W\W]W1530W155UW166WW169-171W172UW[W\W]W179W181W1900W19074W1924gW1926TW4W1955BW1959pWqWuWvWwWZWdWeWfWgWWW1959aBW1960bW1966cWUWXWYW\WoWpWqWWWW1968WWWWA rocksWWWWWWWWW W W WWWWWWWWWW&W'W(W)W2W<W@WAWBWCWEWFWGWHWJWKWLWs€A6966ALower part of alternating green and maroon lime mudstone, succeeded by yellowish-brown weathering, silty to shaly lime mudstone and wackestone, and a main, upper part of light-weathering peloid- and ooid-rich lime packstone and grainstone and rare dolostone in the White Mountains of east-central Livengood quadrangle. Conodonts, brachiopods, and corals indicate an Early Silurian age. In the same strike belt in southeastern Livengood quadrangle, a somewhat younger (Middle Devonian) unit ofe same strike belt in southeastern Livengood quadrangle, a somewhat younger (Middle Devonian) unit of;€B lime mudstone and wackestone has also been assigned to the Tolovana Limestone; this subunit continues into the Fairbanks and Kantishna River quadrangles. Rocks formerly assigned to the Tolovana Limestone in northwesternmost Circle quadrangle are herein assigned to the Schwatka unit (unit Ds); rocks formerly assigned to the Tolovana Limestone in north-central and northeastern Circle quadrangle are herein to unit DSl. Depositional environment interpreted as shallow marineCDStD!Middle Devonian to Early SilurianETolovana LimestoneFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.€A6680€AIn Livengood quadrangle were described by Weber and others (1992), consists chiefly of medium-grained gray dolostone, and light-gray, yellow-gray, or buff dolomitic mudstone, packstone, and wackestone. Coarser-grained rocks show abundant peloids and crossbedding; laminations present in mudstone; solution breccia and algal coatings present. Other interbedded rock types include chert, black argillite, lime mudstone, basaltic greenstone, tuff, tuffaceous siltstone, shale, and minor volcanicBlastic graywacke (Weber and others, 1992). In the Tanana quadrangle, consists of white, massive, locally laminated cherty dolostone having gray limestone at top and bottom of section (Dover, unpublished mapping, 1997). In the Circle quadrangle, consists of yellow-gray dolomite and gray to dark-gray and black argillite, shale, and siltstone, interlayered with light- and dark-gray chert, gray marble, and gray, fine-grained quartzite (Foster and others, 1983). Age poorly constrained; age r+€Cange given here is from Weber and others (1992). Must be older than the fossiliferous Middle Devonian strata that overlie it, and at least in part Cambrian or younger because it has yielded sponge spicules and unidentifiable radiolariaCSZaDSilurian to Late ProterozoicEAmy Creek unitFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.na quadrangles, unit Pzlc in Tanana quadrangle (Dover, unpublished mapping, 1997), the Nilkoka Group in Fairbanks quadrangle (Pewe and others, 1966), and unit DOc in Mount McKinley and Kantishna River quadrangles (Bela Csejtey, Jr., written commun., 1993; Chapman and B others, 1975)COlcD OrdovicianEChertF Wilson and others, 1998 (DOGmap)and others, 1998 (DOGmap)BpeloidsWpenetrativeWW1WpennsylvanianeWeWeWWWWWWWWWWWWWWWWWW"blocksWWblue-greenoWblueschistVW)WbodiessWyWWWEWVWbWWWWWWWWWW&W'W(W)WDWEWFWGWHWJWbodyMWyWWDWborderMWWborderingUWWW WbothVW)WbottomWWWWWtomWW)WbottomWWWWWWWWWWWWWWWWWWWWWWWWgUWWW WbothVWuW)WbottomWWWbottomWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWlmknA2320AChiefly crystal and lithic tuffs and volcanic graywacke interbedded with laminated mudstone. Tuffs and graywacke characterized by abundant potassium feldspar crystals and potassium-rich volcanic rocks fragments. Unit contains rare mafic and intermediate lava flows. Unit contains dinoflagellates of late Early Cretaceous (Hauterivian, Barremian, and possibly Aptian) age. Unit conformably overlies and is transitional into unit Kv CKtgDEarly CretaceousE&Tuff, volcanic graywacke, and mudstoneitsMWWjagerXWXWWXWXWXWjamWWWWWWWWWWWWWWWWWWWWWWWr€A7711ABDistinctive marker bed of lime mudstone within chert unit, locally characterized by coated ooids. Thickness varies from 10 to several ten's of meters, probably in part due structural thickening and repetition. Only mapped locally. Corresponds to unit Pzl, in part, of Chapman and others (1982) in the Tanana quadrangle BCOclD Paleozoic?E LimestoneFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.er bed of lime mudstone within chert unit, locally characterized by coated ooids. Thickness varies from 10 to several ten's of meters, probably in part due structural thickening and repetition. Only mapped locally. Corresponds to unit Pzl, in part, of Chapman and others (1982) in the Tanana quadrangle BCOclD Paleozoic?E LimestoneF Wilson and others, 1998 (DOGmap)€AgDark-greenish-gray mafic volcanic rocks and interbeds of black phyllite, chert-pebble conglomerate, light-green tuff, and graywacke (Reed and Nelson, 1980). Volcanic rocks include pillow basalt, breccia agglomerate, tuff, and massive basalt flows. Distinguished from unit Trpb (this map, unit Pzbs, Reed and Nelson, 1980) by presence of massive basalt flowsgCPzvsDlate or middle PaleozoicEVolcanic and sedimentary rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix., quartzite, limestone, chert, and phyllite. Sedimentary member consists of shale, chert, and limestone which are intruded by gabbro. Late Ordovician brachiopods, trilobites, gastropods, and conodonts have been recovered from sedimentary rocks in the volcanic memberntary rocks in the volcanic member^€B; Early Ordovician conodonts and trilobites have been recovered from the sedimentary member (Weber and others, 1992). Mapped in the White Mountains stratigraphic belt of Livengood, Circle, and Tanana quadrangles (Dover, 1994). Laterally equivalent to Livengood Dome ChertCOfcD OrdovicianEFossil Creek VolcanicsFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.€A7350BxLight-brown weathering calcareous schist interbedded with gray quartz-mica schist and marble. Brooks Range schist belt.CDcsDDevonianECalcareous schistFPatton, W.W., Jr., and Miller, T.P., 1973, Bedrock geologic map of Bettles and southern part of Wiseman quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-492, scale 1:250,000.€A5295A7242mwhollyWWWwidesWWWWWHWJWwidelyuWWwidespreadWEWFWWFWWuWuWBWBWBWBWBWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWCWwidelydistributedandexposedgraniticintrusiverockschieVVVVutedbiotite-muscovitegranitetoquartzmonzoVVVVVVVV ageWWWWWWWWWWW W W WWWWWWWWWWW W!W"W&W)W+W-W.W0W1W2W7W<W@WAWBWCWDWEWFWGWIWKWLW J€D Paleozoic?E=Ruby metamorphic complex -- Metamorphosed mafic igneous rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.tz, and feldspar. A U/Pb zircon determination from unit in the Tanana quadrangle yielded a crystallization age of 390 Ma, which suggests that it is approximately the same age as unit Dgna in the Arctic Alaska terrane CDgnrDDevonianEGranitic gneissA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A5525,000.4€A5525 1998 (DOGmap)€A5525zvolcanic-richWWvolcaniclasticpWWW'WVWWWeWvWWW W WW)WKWLWW)W*W*W*W*W*W*W*W*W*W*W*W*W*W*WWWWWWWWWWWWWWWWWWWWWWW W WWWWWWWWWWWWW W WWWQ€A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4KnixonWWWWWWWnixonforksequencenovimountainandtelsitnaformationsanVVVVntainandtelsitnaformationsanVVanVVVVVVVVVVVVVVationsanVVanVVarinecarbonateunitsofholitnVnixonforksequencewhirlwindcreekformationandunnamedcoVnizina5Wnon-marineSWnonmarineUW[Wnonmarineshalesiltstoneandsandstone[VnorthWWXWYWnortonZWnortonbaysequenceZVnoviWofBWXWYWZWdWrWsWWHWIWJWeWfWgWhWWWWolderrWorBWWorcaWWXWYWZWWorcagroupundividedWVorthogneissWothermWparadiseWpebble-cobbleWWpebblyaWpeliticHWIWJW/Wpeliticschist/Vphosphatic;Wphosphaticshaleandlimestone;VphylliteHWIWJW_Wphyllitepeliticschistcalc-schistandamphiboliteofthemHVIVJVplugstWplutonWWplutonicmWporphyrytW#0intermediatesWWWWJWintrusivesWDWzWWWWWJWintrusiveandvolcanicrocksundividedzVintrusiverocksDVkokrinesWlavacWoWpWxWoWpWWWWWlimestone6WfWWWWWWWWlimestoneandtheutukokformationandelilimestone6V6Vmestone6V6Ve6V6Vlilimestone6V6Vne6V6VV6VV6VVVVVVVlimestoneandmarble1V1V1V1Vstoneandmarble1V1Vble1V1Vlimestoneandmarble1V1Vrble1V1V1V1V1VVlimestoneandmarble1V1Vndmarble1V1VWlimestoneandchertVlimestoneandmarble1V1Varble1V1Vlimestoneandmarble1V1V1VoneandchertVlimestoneandmarble1VVmarble1VVlimestoneandmarble1VVVVV1VVVrineRW\W]Wmarinemudstoneandsandstone]Vmarinesandstoneandsiltstone\VmatanuskaQWmatanuskaformationQVestone n)rhyolite^WoWpWsWyWoWpWWWWWWWWWJWrhyolitedaciteandtrachyteflowsandcrystalandlithictupVrhyolitic\WvWWrhyoliticvolcanicandminorassociatedsedimentaryrocksar\VrhythmicallyWrhythmicallyinterbeddeddark-graytoblackchertyargilliteVrich_WridgesZWWWWIWrimmed^Wrims'Wrip-upXW]Wrip-ups_Wripple]Wripple-laminated_WrippledWriverBWMWvWVWXWYW\W_WWWWWWWWWWWWrobinsonWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW8390W39ar[WW W!W"W4MW'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'W'WWWWWWWWWWWW4.5]W]W=healykWhemipelagicWWhenceWhereWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWLmaligniteWmantle[WW W!W"WmantledlWmantlingWmapFW\WcW_W`WkWWWWWWWWWWW,W0WmappableWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmappableWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWuWvWwW}W~W@WGWHWIWJWOWRWTWXWYWbWcWeWfWgWiWjWkWlWmWnWoWpWqWWWWWW W W WWW4W:W<WJWKWLWOWPWbWgWjWkWlWmWnWtWuWvWwWWWWWWWWWWWWWWWWWWWWWWWWdiabasevWVWWWXWZWbWWW)WdiabasegabbroleucogabbroandgreenstoneultramaficrocksiXVdiabasicWHWdiameter]WWerencesWWWWWWWWWWWWWWWWWWWWWWWWW7geologicalWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWHWHWHWHWHWHWUxfamennianWfanCWXW`WWWWWWWfan-deltaWWfashionWfaultMWAWZWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW|qhoweverZWeWWWW<W@WAWBWCWEWFWhughesVWXW`WWWWIW3W3W3W3WWWWWWWWWWWWWWWWWWW€ASchistose felsic volcanic rocks, including flows, tuffs, and porphyritic hypabyssal? rocks, interlayered with metasedimentary rocks belonging to units | Ag A) A}A%AABAABAAbAbAbAAbAAbAbAAbAAbAbbAbAAbAbAbAbAbAbbAbbAAbAAbage-diagnosticWWWWWWWWWWW €A5565, and less precisely dated crinoids, corals, and gastropods were collected (Wahrhaftig, 1968). Meta-andesite from the northeastern Big Delta quadrangle yields a U-Pb zircon age of 375 Ma that is interpreted as an extrusive age of protolith (Dusel-Bacon and others, 1993, p. C-14). Comprised of the Totatlanika Schist of the Fairbanks (Pewe and others, 1966) and Healy quadrangles (Csejtey and others, 1992), various units of the Totatlanika Schist in the Chena River area (Smith and others,CP 1994), and the Pzsg unit of Weber and others (1978) in the Big Delta quadrangle,CMDtD&Early Mississippian to Middle DevonianE6Yukon-Tanana metamorphic complex -- Totatlanika SchistF Wilson and others, 1998 (DOGmap)€A5565gD Paleozoic?F Wilson and others, 1998 (DOGmap)en gneiss. Probably derived from the Totatlanika Schist (MDt). Mapped only in the Big Delta quadrangle where shown as unit Pzc by Weber and others (1978)CMDtmDmiddle Paleozoic?5 onlyeWWWWontWooid-richWooidsWopaqueoWophirYWZWcWeW W WW2WKWLWorDWAWkWuW'WvWWWWWWWWWW1WDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDWDW8W8W8W8W8W8W8W8W8W8W6W8W8W8W8W8W8W8W8W8W9W5W1W1W1W1W1W*W*W*W*W*W%WW%W%W%W%W%W%W%W%W%W%W%W%W%W%WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWpWqWZWorangeIWWWorangelight-tanorlight-graymassive-beddedcoarseconglomIVorange-brownAWorange-weatheredWG-packstoneWWWpahoehoeEWpaleocurrentUWW WWpaleocurrentsWWpaleozoic[W`WcWWWWWWWW W!W"W-W.W1W2W<W@WAWBWCWEWFWHWpalynfloraeWpalynofloraWpalynomorphsWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWu(9dutroWWWe-wMWearlyRWSWUWVWWWXW]WaWnWoW[WWWWWWWWWW W W W WWWWWWW W!W"W<W@WAWBWCWEWFWIWKWLWeast_W_WWWeast-centralWeasternWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWadepositsCWMWWWWWWWWWWIWdfWdiabasevWHWsequencepostriversandstonelymanhillsformatioVmatioVVuencepostriversandstonelymanhillsformatioVVVVVoVVVVVVVsequencepostriversandstonelymanhillsformatioVVVVVVWWeagleWequivalentkWlWmWnWWfaciesAWfelsic^WkWfelsicintrusiverockskVfine-grainedhWiWflowspWqWflowstuffandbrecciaundividedpVqVfluviatileTWfluviatilesedimentaryrocksandsubordinatevolcanicrocksTVflysch_W W W W Wflyschsequence Vflysch-likexWflysch-likesedimentaryrocksxVforelandOWQWformationIWJWKWPWQWRWUWVWdWOWQWcWWWW2W3W4WpWWWformationsOWWgabbro.~WDWFWPWWgabbrodiabaseandmetagabbroDVFVgemukBWgemukgroupBVcsillsandpltVhypabyssalmaficintrusiverocks_V:and/orVWXWandalusite-cordieritWEWFWFW}caWW&W<W@WAWBWCWcalcWWWW-W.W<W@WAWBWCWGWcalcschistthinbeddedschistoseimpuremarbleandfine-graVcalc-silicateWcalcareniteWWcalcareousRW]WoW6WcWvWWWWWW WWW+W2Wcalcareous-clastWWcalcilutiteWWcalciruditeWWWWWWWcalcitic*W*Walcitic*W*W*W*W*W*W*W*W*W*W*W*W*WitehWiWcalcite-cementedWcalcitic*W*W*Wcalcitic*W*W*W*W*WitictodolomiticmarbleindistinctivemarkerbedsinteVVVVVVVVVtodolomiticmarbleindistinctivemarkerbedsinteVVVVVVVVVVVVVVVVVVVVVVVVVH AAHP LaserJet 5/5M PostScriptw odXXP?Rp_A+RdB|Custom page 1|CCCustom page 2|CCCustom page 3|CCfA~0'd€A7260cke, grit, and argillite ywacke, grit, and argillite ist>undividedcWpWUW WWWZW^WvWzWWWW W W WWW,W:W;WKWLWungalikWungalikconglomerateVVVVVVVVVVVVVVVVVVVcanicDWEWFWSWTWZW[W\WdWeWKWLWMWXWYW`WiWjWkWlWmWW:WOWvolcanicandsedimentaryrocksundividedSVvolcanicgraywackeandconglomerateXVYVvolcanicgraywackeandmudstone`VvolcanicrocksiVjVkVlVmVvolcanicrocksofthecantwellformationdVvolcanicrocksoftheorcagroupundividedZVvolcanicrocksundividedDVEVFV[VKVLVMVvolcaniclasticnWvolcaniclasticrocksnVvolcano-plutonicyWvrainWWvrainunitVVwestOWQWwestforelandformationQVwilber_W Wwilbercreekflysch_Vwilbercreekflyschandwolverinequartziteundivided VwishboneOWRWwishboneformationRVwolverineWWW WwolverinequartziteVVV;0.19EW1MW[WWWWW W!W"W"W"W"W"W"W"W"WWWWWWW66806681670690269106911q692069306931r694069446945695269556956696069656966701072407242725072907291730073207325P73307402752075807610771077117907958000825083008310834083508410843084508558600860186108620862586308632863386408641865086608708700871088088018802890900910932093219322932393249325932693279400950951952990.2aW0.25`W0.5aW0.7 W1KWeW WtWWWWWWWWWWrcarbonate]WaW6WVW_WWWWWWWWWWWW&W)W<W@WAWBWCWEWFWcarbonate-rich]WWWWWcarbonatite_Wcarbonized]WWWWcassvWZWeWcasts]WcataclasticWWcataclastically'WcenomanianRWUWW W WWcentimeter-scale[WW W!W"WcentimetersUW]WW WcentralMWWWWWW W WWIWKWLWWWWWWWWWWWWWWWWWW W WWWWWW9W9WW9W9W9Wcf8W9W9W9W9W9W9W9W9W9W9W9WWWWWW W WWcf7W8W9W9W9W9WW9W= metersWWWIWmgbWWmiZWmicaEWWWWmicaceousVWWWWWWWmicaeousCWUWWWWWWW WEWFWGWmicasUWW Wmicro-veinletsWmicrofossilscW2WmicrolitesxWoWmidWidWWdWWoWmidWWWWWWWWWmid-cretaceousWaceousWWWWWWWWWWWWeousWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWmid-cretaceousWWWWWWWWWWWWWWWWWWWWWWWWWWpcmWpdmsWpeatWWWpebbleSWUWWWYWWW WWWWWpebblesWpebblyaWpegmatite[WW W!W"WpeliticWWWWGWpelletoidalWpeloidWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWloidalWWWWWWWWWWWWWlWWWWWWWWWWidalWWWWWoidalWWWWWWWWWWdalWWWWalWWWWWWWWWWWWWtsill-likeEWVW)WsillimaniteWEWFWsillsoWsWkWuWWW^WWWWWWJWsiltCWWWWWWWWWWWWWWWWWWWWWWWWWWsiltCWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW%Äv3Äv47ÄvAÄw1ÄwÄz!ÄzgÄzqÄzwÄrÄaÄa:Äb<Äd@ÄeAÄfBÄ1ÄÄ!Ä!Ä"ÄÄ!ÄDÄÄCÄ;Ä.Ä!Ä6EÄQÄRGÄÄ!ÄÄ6FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8`leucogabbroXWlight\WvWWWWWWWWWWW+WlightgraymassiveorthinlylaminatedquartziteandmediumVVtgraymassiveorthinlylaminatedquartziteandmediumVVVlighttodarksilverygraytogreenorblackphyllitewithi8V8V8V8Vttodarksilverygraytogreenorblackphyllitewithi8V8V8V8V8V8V8V8V8V8V8V8V8V8V8V8VV1V1V1V1V1Vpoorly1V1V1V1VVVVVVq1969XWYWWWWWWWWWWW andWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWHWHWHWHWGWGWGWGWGWGWGWGWGWFWFWFWFWangle (GilbeCrt and Redman, 1977). Unit appears to occupy regional stratigraphic position between the Totatlanika Schist and unit PzZyqs of this map. As mapped, includes the Keevy Peak as originally defined by Wahrhaftig (1968) in the Healy and Mount McKinley quadrangles; new age data support extension of the unit to the Big Delta, Circle, and Fairbanks quadrangles, and correlation with the Nasina assemblage in Yukon Territory proposed by Weber and others (1978). Includes unit Pzq in the Big Delta (IA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4JA1641BIncludes a wide variety of shallow intrusive rocks including rhyolite, dacite, trachyite, and andesite plugs, domes, sills, and dikes and larger more coarsely crystalline bodies of granite, granodiorite, tonalite, and monzonite porphyryCTKiDTertiary and Late CretaceousE?Shallow intrusive rocks of silicic and intermediate compositionA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 andWlowerpartofalternatinggreenandmaroonlimemudstonesucVlowlandWlowlandsCWWWWlozengesAWmZWmaEW]WlWvWxWyW{W|WVWoWpWsWuW~W'WEWXW[W_WeWWWWWWWWWWWWWWWWWWW W!W"W-W.W0WDWEWFWGWmaarDWmaastrichtianWWWWWWWanWWWWWWWWhtianWWWWWWWWWWWWmackevettWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW formsWWW%]€€A6522AStrongly foliated quartzofeldspathic gneiss. Consists of a coarse- to medium-grained porphyroclastic biotite-quartz-feldsparmuscovite mylonite gneiss containing resistant augen of K-feldspar in a ductile matrix of mica, quartz, and feldspar. A U/Pb zircon determination from unit in the Tanana quadrangle yielded a crystallization age of 390 Ma, which suggests that it is approximately the same age as unit Dgna in the Arctic Alaska terrane CDgnrDDevonianEGranitic gneissA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A5525ageEWMW]W^WlWvWyWAWUWVWWWXW]W_W`WaWnWoWpWsWWWW6WEWVWXW[W^W_W`WbWcWeWfWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW0yukonMW\W`WWWWWWyukon-koyukukyWUWW WWyukon-tananaAWzirconWWWWWWW7WDWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWGWDWDW7W7W7W7W7W7W7WWWWWWWWWWWWWWWWWWzoneaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaWaW5onWWWWWWWWWWWWWWWWWW3WW€FWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix. geologicWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWgeologicalBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWD! €^€_A5542AMixed assemblage of laminated fine-to coarse-grained quartzite, grit, and argillite grading upward into very fine-grained quartzite, argillite, phyllite, and chert. In southeast corner of Medfra quadrangle unit is metamorphosed to greenschist facies composed of sheared and foliated grit, quartzite, quartz-muscovite schist, and subordinate thin carbonate rocks and metachert. No fossils found in this unit in the Medfra quadrangle, but to the east in the adjoining Mt. McKinley quadrangle itoldervWWWWoligoceneMWolivineEWFW[W`WW W!W"Wolivine-bearingWonMW\W_W`WkW'WEWWWXWZW^WeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWOthickCW]WWWWWWWWthick-beddedWthickeningWthickens\Wthickest`WthicknessUWWW WthinoWVW]W_WeWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWG€zFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.)€e€fA6080A/Varicolored radiolarian chert, lenticular beds of fossiliferous limestone and interbedded argillite. Subordinate beds of sandy limestone, grit, and arkosic sandstone. Unit contains abundant radiolaria, condonts, and foraminifera that range in age from latest Devonian to possibly as young as Triassic /CTrDcDTriassic? to DevonianEChert, argillite, and limestoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€FWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.110uWW112WW113WW117W118WW120oWuWW0W124-W.W1265WGW130'W134WEWFW136WEWFW137oW15RWSW'W WW1500WWIW155[WW W!W"W159[WW W!W"W161[WW W!W"W162[WW W!W"W172[WW W!W"W173'W1959vWZWeW1966YWWWWWWWWWWWWWWWWWW1968WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWpzsWWpzzi<W@WAWBWCWpzzsrW'WpzzssWqtbDWtbDWbDWtbDWbDWbDWqtbDWbDWqtbDWbDWbDWbDWbDWbDWtbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWWbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWqtbDWbDWqtbDWbDWbDWbDWbDWbDWqtbDWbDWbDWtbDWbDWtbDWbDWbDWbDWqtbDWbDWbDWqtbDWbDWqtbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWqtbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWqtbDWbDWtbDWbDWbDWbDWbDWtbDWbDWbDWbDWbDWbDWbDWbDWbDWbDWDWbDWWWWWsole[WWW W!W"W1Wsole-markedWWsolutionWsomeDWXW`WWW W WWWW&W-W.W0WEWFWKWLWFWFW0W0W0W0W&WWWWWWWWdifferent&Wdike0Wike0W0WWWWdifficultRWRWW\;mustWmyloniteWWmzpzcWWmzpzdzWmzpzgzWmzpzizWmzpzmzWmzzmaWnarrow[WW W!W"WnatureUWW WneWne-swWnearMWUWVWWW W)WW)WW)W)WW)W)W)W)W)WW)W)WW)W)W)W)WW)W)W)W)W)W)W)W)W)W)W)W)WW)W)W)W)W)W)W)W)W)W)W)W)W)WW W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WW W W W WW W W W W W WW W W W W W W W W W W WWWnearlyEWFWnecessaryZWnegondolella7W8W9WnelchinabWnelson W WkWlWmWnWpWtWuWyWzW{W|W}W~WWWWWWWWJ€W€XA5130ADiabase, gabbro, leucogabbro, and greenstone; ultramafic rocks include serpentinized peridotite, harzburgite, and werhlite. Locally, may include minor associated sedimentary rocks. Tentative age range based on K-Ar age of 210+/-6 Ma reported by Brosge and others (1969; age recalculated using constants of Steiger and Jager, 1977) on gabbro in Rampart Group, and stratigraphic and/or intrusive relationship with rocks as young as Triassic. Includes unit TRMrg in the Tanana B-1 quadrangle (RBweifenstuhl and others, 1997), unit TRMrv in the Livengood quadrangle (Weber and others, 1992) (Foster and others, 1983)eCJTrtmuDJurassic? to TriassicE7Tozitna assemblage (north): Mafic and ultramafic rocksFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.E€€ A2812BNLocally mapped unit consisting of units KJwc and Kwcf in the Tanana quadrangleCKJwcD!Early Cretaceous or Late JurassicE6Wilber Creek flysch and Wolverine quartzite, undividedFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.FWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.dfsouthernMW\WWWIWsouthwestWWsouthwesternyWkWeWWW,WsparseVWVWWWWW)WsparselylW]WkWspatiallyWspeciesRWoW WWspicules6WWspiculite6Wspiculitic6WVW)WspiliticvWWWsponge6WWsquareWss0WstabilizedWstandlineSWWSWSWSWSWSWSWSWSWSWWSWSWSWSWSWSWSWSWSWSWSWeSWSW0WsshWstrWWstabilizedWstandlineSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWlineSWSWSWSWSWSWSWdlineSWSWSWSWSWSWSWSWSWdlineSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWneSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWSWndlineSWSWSWSWSWSWSWlineSWSWfsubunit@subvolcanic@suggests@#talkeetna@ tb@tectonic@terraneVxterranes@sterritory@the@cEa`theshallowmarinedepositsinthelowerpartoftheunitks@then@thick@thin-banded@Othin-bedded@this@tholeiitic@till@time@-tintina-kaltag@toYtokatjikh@trachyandesite@troublesome@turn@btyonek@types@u-shaped@undated@unfossiliferous@unitVunitcomprisesnumerousalkalibasaltbasaniteandhawaiite@Dunitconsistschieflyofbiotiteandmuscovite-biotitegranitunits@unknown@@upward@eupward@eeiotitegranitunits@unknown@@n@@@@unknown@@@0contactsWcontainoWUW]WoWWWWVWcWWWWW W&W)W2WcontainingUW`WWWW`WWWWWWWW WcontainsDWRWUWVWWWYW]W`WaWnWoWvW6W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWo* wilsonsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWoWoWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpWpW€A4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A108BChiefly silt and very fine sand including thick deposits of micaeous silt in the Koyukuk Flats and Nowitna and Innoko Lowlands. Local deposits of alluvial fan and glacial outwash gravelsCQuaD QuaternaryE$Surficial deposits, undifferentiatedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4€A110yrangingbWzWWWrareVW_WnWWWWWWrarely{WratioXWWratiosWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWnodulesWnogahabaraWnoklebergWWzWnon-diagnosticSWnonfossilferous W WWKWLWnonfossiliferousWnonmarineMWUWW WWWnonmarinefluvialdelta-plaindepositsthatgradedownwardiUVV Vnorian6W6W6W6W6W6W6W6W6WVnorian6W6WVnorian6W6W6W6W6W6W6W6W6W6Wian6W6W6Wnorian6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6W6WnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnWnW\WamphiboliteAWWW[WWWW W!W"W0Wamphibolite-faciesWEWFWamygdaloidalvWYWanMW^WyWUWoWEWZW[WWWWWWWWWWWW WWWW W!W"W+W0WIWanalysesWWW<W@WAWBWCWanchorageuWWWWWWWWWWWWWWWuWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWqJTreconnaissanceCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W_W`WbWcWfWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W#W$W%W&W'W(W)W*W+WscaleCWDWEWFWMW\W]W^WcWlWoWpWsWxWyW{W|WRWSWUWVWXW\W]WaWnWoWpWsWvWwW~W'W6WVW[W`WbWcWW(Acontainscontent@wcontrol@ correlates@mcr@cross@ cross-bedded@crossbedded@cumulate@zczwa@dark-gray@Xdark-greenish@dated@Udeformed@deposited@ydescribed@diabase@different@dikes@dipping@'different@dikes@dipping@''different@dikes@s@ikes@*GAChiefly pelitic and quartzose metasedimentary rocks of greenschist metamorphic facies. Micaeous quartzite and quartz-chlorite schist grade into quartz-muscovite-biotite-garnet schist. Subordinate calc schist and marble. Unit locally includes small bodies of greenstone and greenschist metabasite, granitic gneiss, and metamorphosed quartz porphyry. Zircon fractions from two samples of metamorphosed quartz porphyry indicate a crystallization age of 1,26550 Ma. Metamorphic mineralsBP from the schist yield K/Ar isotopic cooling ages that range from 921 to 296 Ma >CZsD ProterozoicEEPelitic schist, quartzite, quartzo-feldspathic gneiss, and greenstoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4!isolatedWisotopicEW^WlWxWyW{W|WVWoWpWsW~W'W[W_WWWWWWWWWWWWWWW W!W"W-W.W0W<W@WAWBWCWEWFWGWitVW_WWWWWWWWW)WDWDWDWDWDWDWDWDWWWWWWWWWWWWWW-tintina-kaltagAWtinyMWtio2WtkapWtkdpWtkvvWtkvcSWtkvikWtoMW\WcWlWvWxWyW{W|WAWRWSWUWVWWWXWYW\W]W_W`WaWkWoWuWvWwW~WWWWWW'WVWWWVWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWUWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWwYcontainsWWWWWWW W WWWWW+W2W2W2W>€€A7710ADark gray and black chert, siliceous slate, argillite, and less abundant greenstone, impure limestone, and dolostone. Age assigned on basis of graptolites. Includes the Livengood Dome Chert in the Livengood, Circle, and Tanana quadrangles, unit Pzlc in Tanana quadrangle (Dover, unpublished mapping, 1997), the Nilkoka Group in Fairbanks quadrangle (Pewe and others, 1966), and unit DOc in Mount McKinley and Kantishna River quadrangles (Bela Csejtey, Jr., written commun., 1993; Chapman and B others, 1975)COlcD OrdovicianEChertFWilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of Central (Interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 3 sheets, scale 1:500,000, 63 p. pamphlet, 13 p. appendix.JsWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW W W W WWWWWWWWWWWWWWWWWW W!W"W&W'W(W)W+W-W.W0W1W2W7W:W;W<W@WAWBWCWDWEWFWGWHWIWJWKWLWHWHWHWHWHWHWHWHW €€A7610ATwo members, one largely volcanic, one largely sedimentary. Volcanic member consists of alkali basalt, agglomerate, and volcaniclastic conglomerate. Agglomerate and conglomerate contain well-rounded clasts of basalt, granite, quartzite, limestone, chert, and phyllite. Sedimentary member consists of shale, chert, and limestone which are intruded by gabbro. Late Ordovician brachiopods, trilobites, gastropods, and conodonts have been recovered from sedimentary rocks in the volcanic member0 ႀむ䂀傀邀ꂀ낀킀  !"&'()+,-.0127:;<@ABCDEFGHIJKL€€A8610BCalc schist, thin bedded schistose impure marble, and fine-grained massive sandy marble. Contains subordinate quartz-mica schist and small bodies of greenstone. Unit underlies unit Ont and gradationally overlies unit ZsCZcD ProterozoicE/Calc schist, quartz-mica schist, and greenstoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4:scaleBWCWDWEWFWMW\W]W^WcWlWoWpWsWvWxWyW{W|WAWDWRWSWUWVWWWXWYW\W]W_W`WaWkWnWoWpWsWuWvWwW~WWWWWW W'W6WEWVWWWXWYWZW[W^W_W`WbWcWeWfWvWzWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW4within_WWWWwithoutWWWWWWWWWWWWonsistsofpoorlydescribedmetasedimentarywithoutWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW{plutonsuWWWpollenMWpolycrystallineUWW Wpolydeformed<W@WAWBWCWpolymictic_W_Wpolymictic_W_W_W_W_W_W_W_W_W_Wic_W_W_W_W_W_W_W_W_W_WpoorWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW€AChiefly pelitic and quartzose metasedimentary rocks of greenschist metamorphic facies. Micaeous quartzite and quartz-chlorite schist grade into quartz-muscovite-biotite-garnet schist. Subordinate calc schist and marble. Unit locally includes small bodies of greenstone and greenschist metabasite, granitic gneiss, and metamorphosed quartz porphyry. Zircon fractions from two samples of metamorphosed quartz porphyry indicate a crystallization age of 1,26550 Ma. Metamorphic mineralsBP from the schist yield K/Ar isotopic cooling ages that range from 921 to 296 Ma >CZsD ProterozoicEEPelitic schist, quartzite, quartzo-feldspathic gneiss, and greenstoneA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4IGHA1680BFresh to altered gabbroic and diabasic intrusive bodies. Unit intrudes rocks as old as middle Paleozoic and as young as Cretaceous. May represent a wide range of ages CTDgDTertiary? to Devonian?EGabbro and diabaseA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4IA135 ]Ä2&_Ä26aÄ2c]Ä2Ä2XÄ2YÄ2Ä3!pÄ3qkÄ41nÄ4AoÄ4FvÄ4GÄ5!wÄ51~Ä5QÄ5aÄ5qsÄ5uÄ6!Ä6&Ä6AÄ6FÄ6VÄ9# Ä9&Ä9'Ä9(ÄD'ÄE[ÄEÄE ÄIbbÄQC6ÄTQEÄYDÄa#vÄa1YÄa2cÄb#eÄb$^Äb1zÄbAXÄbB`ÄbCWÄbDZÄbQVÄbVÄba!Äb"ÄcAÄcR&ÄcS'ÄcT(Äc)ÄcÄcÄd!Äd1+Äd2,Äd3-ÄdQÄe!Äf20Äf6ÄfS_ÄfqÄfr1ÄfvÄg&ÄhQÄhV2ÄqfÄv3Äv47ÄvAÄw1ÄwÄz!ÄzgÄzqÄzwÄrÄaÄa:Äb<Äd@ÄeAÄfBÄ1ÄÄ!Ä!Ä"ÄÄ!ÄDÄÄCÄ;Ä.Ä!Ä6EÄQÄRGÄÄ!ÄÄ6F&(#EAndesite and basalt lava flows and volcaniclastic rocks (Ta) and dacite and rhyolite lava flows, domes, and volcaniclastic rocks (Td), undividedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4nppBRhyolite, dacite, and trachyte flows and crystal and lithic tuffs, felsic ash-fall tuffs, tuffaceous graywacke, and volcanic conglomerate. One K/Ar isotopic determination from this unit gave a cooling age of 87 MaCKrdDLate CretaceousEBRhyolite, dacite, and trachyte lava flows and volcaniclastic rocksA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4mnoBied glass. In upper part of the unit, the tuffs are highly calcareous and contain abundant shelly debris, including species of Buchia. Tuffs commonly occur in cyclically repeated sequences that grade upward from coarse tuff breccia and lapilli tuff to very fine-grained cherty tuff and blue-green radiolarian chert. Massive agglomerate, breccia and volcanic conglomerate are present locally. Unit contains abundant marine mollusks of early Early Cretaceous (Berriasian and Valanginian) ageC7. K/Ar isotopic cooling ages range from 137 to 120 Ma CKvDEarly CretaceousE7Andesite and basalt lava flows and volcaniclastic rocksA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4}|QA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4JKA1906AChiefly dark carbonaceous, generally nonfossilferous shale, siltstone and fine-grained sandstone. Poorly exposed except where altered to a dark slaty hornfels in the vicinity of plutonic and hypabyssal intrusive rocks. Locally includes a limestone-clast conglomerate in the central Medfra quadrangle and several volcaniclastic horizons in the Ophir quadrangle. Unit probably correlative in part with unit Kss of Late Cretaceous age, but some beds may be as old as late Early Cretaceous CKsuD CretaceousE*Shale, siltstone, and sandstone, undividedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4LA1942 }LAChiefly dark carbonaceous, generally nonfossilferous shale, siltstone and fine-grained sandstone. Poorly exposed except where altered to a dark slaty hornfels in the vicinity of plutonic and hypabyssal intrusive rocks. Locally includes a limestone-clast conglomerate in the central Medfra quadrangle and several volcaniclastic horizons in the Ophir quadrangle. Unit probably correlative in part with unit Kss of Late Cretaceous age, but some beds may be as old as late Early Cretaceous CKsuD CretaceousE*Shale, siltstone, and sandstone, undividedA4Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska - (Integrated digital geologic map databases of the United States): U.S. Geological Survey Scientific Investigations Series Map SIM-XXXX, scale 1:500,000.4 @SÄ*VÄ11Ä12 Ä14Ä1AWÄ2\Ä2`Ä2Ä2&_Ä26aÄ2c]Ä2Ä2XÄ2YÄ2Ä3!pÄ3qkÄ41nÄ4AoÄ4FvÄ4GÄ5!wÄ51~Ä5QÄ5aÄ5qsÄ5uÄ6!Ä6&Ä6AÄ6FÄ6VÄ9# Ä9&Ä9'Ä9(ÄD'ÄE[ÄEÄE ÄIbbÄQC6ÄTQEÄYDÄa#vÄa1YÄa2cÄb#eÄb$^Äb1zÄbAXÄbB`ÄbCWÄbDZÄbQVÄbVÄba!Äb"ÄcAÄcR&ÄcS'ÄcT(Äc)ÄcÄd!Äd1+Äd2,Äd3-ÄdQÄe!Äf20Äf6ÄfS_ÄfqÄfr1ÄfvÄg&ÄhQÄhV2ÄqfÄv3Äv47ÄvAÄw1ÄwÄz!ÄzgÄzqÄzwÄqÄrÄaÄa:Äb<Äd@ÄeAÄfBÄ1ÄÄ!Ä!Ä"ÄÄ!ÄDÄÄCÄ;Ä.Ä!Ä6EÄQÄRGÄÄ!ÄÄ6F @