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USGS Geologic Investigations Series I-2543, Map Without Base U.S. DEPARTMENT OF THE INTERIOR GEOLOGIC INVESTIGATIONS SERIES I–2543 U.S. GEOLOGICAL SURVEY Pamphlet accompanies map 30' 30' R 22 W 152°00' R 21 W R 20 W R 19 W R 18 W R 17 W151°00' R 16 W R 15 W R 13 W 150°00' R 11 W R 10 W 30' R 9 W R 8 W 149°00' R 6 W R 5 W 30' R 4 W R 3 W 148°00' R 1 W R 1 E 30' CORRELATION OF MAP UNITS LIST OF MAP UNITS POSTACCRETION COVER DEPOSITS PLUTONIC ROCKS POSTACCRETION COVER DEPOSITS Qs Surficial deposits (Quaternary) ree Qv Quaternary Be C k aver Qv Volcanic rocks (Quaternary) Qs Quaternary Thd Hornblende dacite (Pliocene) T 6 N QUATERNARY Tvs T 6 N Volcanic and sedimentary rocks (Tertiary) Thd Pliocene Tn Nenana Gravel (Pliocene and Miocene) Tn Pliocene TKs Sedimentary rocks (Miocene to Late Cretaceous) and Miocene Tu Usibelli Group (Miocene to Eocene) Tmg Mount Galen Volcanics of Decker and Gilbert (1978) (early Oli- CENOZOIC Tvs gocene and late Eocene) Miocene Tv Tu Early TERTIARY Volcanic rocks (Oligocene to Paleocene) 15' to Eocene 15' Miocene to Tmg Oligocene TKs Late and late Cantwell Formation (Paleocene and Late Cretaceous) Oligocene Tcv Cretaceous Eocene Oligocene Volcanic rocks (Paleocene) Tgr to Tcv Tv to Paleocene TKcs Sedimentary rocks (Paleocene and Late Cretaceous) Paleocene Paleocene Paleocene Kv Volcanic rocks (Late Cretaceous) TKcs TKgr and Late Paleocene Late Kv Cretaceous and Late Cretaceous Kgr Cretaceous PLUTONIC ROCKS T 4 N Cretaceous Tgr Granitic rocks (Oligocene to Paleocene) T 4 N MESOZOIC CRETACEOUS ACCRETED TERRANES TKgr Granitic rocks (Paleocene and Late Cretaceous) Baldry and Ruby terranes, undivided Kgr Granitic rocks (Cretaceous) ? ? ACCRETED TERRANES PERMIAN Baldry and Ruby terranes, undivided Permian(?) to Middle PENNSYLVANIAN PDa Argillaceous rocks (Permian? to Middle or Late Devonian?) T 3 N PDa or Late PDs Permian(?) to T 3 N Devonian(?) Devonian(?) PDs Schistose rocks (Permian? to Devonian?) MISSISSIPPIAN DSl Limestone, dolomite, greenstone, schist, and chert (Devonian and ? Silurian) ? DEVONIAN DOl Limestone, dolomite, greenstone, and schist (Devonian, Silurian, Devonian and Ordovician?) ? and DSl |c Clastic rocks (middle and early Paleozoic?) Silurian Devonian, PALEOZOIC DOl Silurian, and SILURIAN SOvs Volcanic and sedimentary rocks (Silurian and (or) Ordovician) 65°00' Middle Ordovician(?) Silurian 65 00' ° |c and early |=sq Late SOvs and (or) Schist, quartzite, phyllite, and slate (early Paleozoic and Precam- Paleozoic(?) Oc Ordovician brian) Ordovician ORDOVICIAN Oc Chert (Late Ordovician) ? Early Dillinger terrane CAMBRIAN |=sq Paleozoic DOsa Sandstone, argillite, and limestone (Middle Devonian to Ordovician) ? and Precambrian Livengood terrane Dq Quail unit (Late Devonian) T 1 N Dt Troublesome unit (Devonian?) T 1 N PRECAMBRIAN Dc Cascaden Ridge unit (Middle Devonian) Dillinger terrane Livengood terrane Manley terrane SZa Amy Creek unit (Silurian? to Late Proterozoic?) Old Livengood Dome Chert (Late Ordovician) Cretaceous CRETACEOUS KJcs and Late(?) _Zum Ultramafic and mafic rocks (Early Cambrian and (or) Late Proterozoic) Jurassic T 1 S Manley terrane T 1 S ? KJcs Clastic sedimentary rocks (Cretaceous and Late? Jurassic) JURASSIC AND MESOZOIC }|p Phyllite, schistose phyllite, quartzite, siltite, amphibolite, diorite, TRIASSIC and greenstone (Mesozoic or Paleozoic) _Zsp Serpentinite and mafic rocks (Early Cambrian and (or) Late Pro- Mesozoic terozoic) }|p or 45' Paleozoic PERMIAN McKinley and Pingston terranes, undivided 45' TO KJf MISSISSIPPIAN Flysch (Early Cretaceous and Late Jurassic) ^bd Basalt, diabase, gabbro, and subordinate interbedded sedimentary Late ? Dq rocks (Late Triassic; Norian and Karnian) Devonian Dt Devonian(?) Middle Dc DEVONIAN ^cs ? Devonian Calcareous sedimentary rocks (Late Triassic; Norian and Karnian) ^*s ? Flysch-like sedimentary rocks (Late Triassic to Pennsylvanian) SILURIAN Dy DOsa Middle Yanert Fork sequence (Late Devonian) Devonian to PALEOZOIC Ordovician Minook terrane Late Old ^c T 3 S Ordovician Black shale and chert (Triassic) Silurian(?) ORDOVICIAN T 3 S SZa to Late Ps Sedimentary rocks (Permian) Proterozoic(?) Early Early Nenana terrane Cambrian Cambrian CAMBRIAN _Zum and (or) _Zsp and (or) ^sc Sedimentary calcareous rocks (Late Triassic) Late Late Proterozoic Proterozoic Nixon Fork and Minchumina terranes, undivided ? Dls Limestone and siltstone (Late? Devonian) PROTEROZOIC T 4 S McKinley and Pingston terranes, undivided Minook terrane Nenana terrane DOc Chert (Early Devonian to Ordovician) T 4 S DOs Shaly rocks (Early Devonian to Ordovician) Early Cretaceous CRETACEOUS KJf and |ma Late Jurassic Mudstone, argillite, grit, quartzite, calcareous quartz-chert are- JURASSIC nite, sandy limestone, and minor chert and quartz-mica schist (early Paleozoic?) Late Late 30' ^bd ^cs ^sc Triassic Triassic MESOZOIC 30' ^c Triassic TRIASSIC Seventymile terrane PMum Ultramafic and mafic rocks (Early Permian? to Mississippian?) T 5 S Late Triassic ^*s to T 5 S Tozitna terrane Pennsylvanian Ps Permian PERMIAN ^Mms Mafic igneous rocks and sedimentary rocks (Triassic to Mississippian) White Mountains terrane, Wickersham terrane, and PENNSYLVANIAN Yukon-Tanana terrane north of Tanana River, undivided ^m PALEOZOIC Mafic igneous rocks (Triassic) MISSISSIPPIAN Late Mg Globe unit (Mississippian) Dy DEVONIAN T 6 S Devonian M_bh Birch Hill sequence (Mississippian to Cambrian) T 6 S Nixon Fork and Minchumina terranes, undivided Seventymile terrane Tozitna terrane M_cr Chena River sequence (Mississippian to Cambrian) Dcg Conglomerate, graywacke, and slate (Devonian?) TRIASSIC DSt Tolovana Limestone (Middle Devonian to Early Silurian) MESOZOIC |cs Chert and siliceous shale (early Paleozoic) T 7 S ^Mms Triassic to PERMIAN |ch Chatanika unit (early Paleozoic) ? Mississippian Of Fossil Creek Volcanics (Late to Early Ordovician) T 7 S Early Permian(?) PMum PENNSYLVANIAN to Mississippian(?) _Zwa Wickersham unit (Early Cambrian and Late Proterozoic) ? MISSISSIPPIAN Zwg Grit (Late Proterozoic) 15' ? Late(?) 15' Dls Zf Fairbanks schist unit (Late Proterozoic) ? Devonian DEVONIAN Yukon-Tanana terrane south of Tanana River T 8 S MDt Totatlanika Schist (Early Mississippian to Middle Devonian) ? PALEOZOIC T 8 S SILURIAN Early Devonian Dms Metasedimentary rocks (Late or Middle Devonian) DOc DOs to Ordovician Dmg Metagabbro (Late Devonian?) Early |ma ORDOVICIAN |kp Keevy Peak Formation (early Paleozoic) Paleozoic(?) |=s Pelitic and quartzose schist (early Paleozoic and (or) Precambrian) CAMBRIAN T 9 S Contact—Dashed where inferred; dotted where concealed; queried where doubtful ? T 9 S Fault—Dashed where inferred; dotted where concealed; queried where doubtful White Mountains terrane, Wickersham terrane, and Strike-slip fault—Arrows show relative horizontal movement Yukon-Tanana terrane north of Tanana River, undivided U Fault—U, upthrown side; D, downthrown side D Thrust fault—Sawteeth on upper plate ^m Triassic TRIASSIC High-angle reverse fault—Sawteeth on upper plate MESOZOIC T 10 S PERMIAN Fold—Showing crestline and plunge. Dashed where inferred; dotted where con- AND T 10 S cealed; queried where doubtful PENNSYLVANIAN Anticline Mg Mississippian MISSISSIPPIAN Syncline 64°00' 64°00' ? Strike and dip of beds Dcg Devonian(?) DEVONIAN Inclined ? Vertical Middle Devonian DSt to Early Silurian T 11 S Strike and dip of foliation M_cr Missippian SILURIAN M_bh PALEOZOIC T 11 S to Cambrian Inclined Vertical Late to Early Of |cs |ch Early ORDOVICIAN Ordovician Paleozoic Drill hole Gravity contours—Contour interval 5 milligals. Hachured contours show CAMBRIAN closed areas of relatively lower gravity. X is control point Early _Zwa Cambrian T 12 S T 12 S 152° 150° 148° Zwg Late TZ LG TZ Proterozoic { MNK BRY-RB Zf PROTEROZOIC MAN WHM-WS-YTN Yukon-Tanana terrane south of Tanana River 65° T 13 S MISSISSIPPIAN T 13 S Early Mississippian ? MDt Dmg Late to Middle Devonian Dms Late or Middle Devonian ? Devonian(?) DEVONIAN TKcs 45' 45' TKcs TKcs SILURIAN SV TKcs { TKcs NX-MN TKcs TKcs PALEOZOIC |kp Early T 14 S ORDOVICIAN TKcs TKcs Paleozoic YTS T 14 S Early Paleozoic 64° TKcs |=s YTS and (or) CAMBRIAN Precambrian TKcs YTS TKcs YTS MK-PN TKcs TKcs MK-PN TKcs TKcs NN T 15 S DL PRECAMBRIAN TKcs TKcs TKcs 0 25 50 75 100 KILOMETERS T 15 S TKcs TKcs 0 50 MILES TKcs TKcs TKcs TKcs TERRANE MAP Map of study area showing lithotectonic terranes of the Nenana basin area TKcs 153° 150° 147° TKcs 66° of central Alaska. Adapted from Jones and others (1987) and Silberling and ALASKA Jones (1984). TKcs T 16 S TANANA LIVENGOOD EXPLANATION TKcs 152°05' 147°26' 65°25' { T 16 S TKcs E Cenozoic deposits TKcs G 1 2 BRY-RB Baldry and Ruby terranes, undivided N TKcs 30' 30' 65° DL Dillinger terrane A 4 TKcs A LG Livengood terrane TKcs K R KANTISHNA RIVER FAIRBANKS MAN Manley terrane A L A S TKcs MK-PN McKinley and Pingston terranes, undivided TKcs EXPLANATION 3 5 6 1 Chapman and others (1982, 1975a) MNK Minook terrane R 23 W R 22 W R 21 W R 20 W R 19 W R 17 W R 16 W R 15 W R 14 W R 12 W R 11 W R 9 W R 8 W R 7 W R 6 W R 4 W R 3 W R 2 W R 1 W R 1 E 152°00' 30' 151°00' 30' 150°00' 30' 149°00' 30' 148°00' INTERIOR—GEOLOGICAL SURVEY, RESTON, VA—2001 30' 2 Chapman and others (1971); Weber 64° NN Nenana terrane and others (1992) Base from U.S. Geological Survey, Fairbanks, 1956 (rev. 1976); SCALE 1:250 000 Bedrock geology compiled by Gina M. Frost in 1993 1 NX-MN Nixon Fork and Minchumina terranes, undivided 24 /2 3 Chapman and Yeend (1981); Chapman Healy, 1956 (minor rev. 1981); Kantishna River, 1952 (limited ° from sources shown on Index Map. Isostatic gravity 787 9 505110 520 MILES ALASKA
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