{"text_format":"dbase-jsonl-2026-09-30","columns":[{"name":"ROCK_UNIT","type":"character","width":11},{"name":"UNIT_NAME","type":"character","width":133},{"name":"AGE","type":"character","width":80},{"name":"DESCRIPTIO","type":"character","width":254},{"name":"FOSSIL","type":"character","width":252},{"name":"RADIOMETRI","type":"character","width":254},{"name":"SOURCE_COD","type":"character","width":6},{"name":"CLASS_CODE","type":"number","width":5,"decimals":0},{"name":"QUADRANGLE","type":"character","width":19},{"name":"ROCK_CLASS","type":"character","width":9},{"name":"NSACLASS","type":"number","width":5,"decimals":0},{"name":"LABEL","type":"character","width":6}],"n_rows":1351,"rows_kept":1351,"cut":false,"deleted_skipped":0,"read_ended":"whole","bounds":"16MiB/16384/4096/first_that_fit","version":"dbase_level_three","encoding_class":"enc_absent","reader":"statdb_count/9"}
["Qal","Alluvium","Quaternary","Silt, sand, and gravel of stream beds, flood plains, and terraces",null,null,"RB002",100,"Ruby","Unconsol",100,"Qs"]
["TKi","Intrusive rocks","Late Cretaceous(?) or Early Tertiary(?)","Granite, diorite, quartz monzonite, and  may include dikes of varying composition and texture, older intrusives of the greenstone complex (mi), and  hornfelds zones surrounding intrusive rocks.",null,null,"RB002",201,"Ruby","Ign",1650,"TKi"]
["TKe","Extrusive rocks","Cretaceous or Tertiary","Basaltic, andesitic, and rhyolitic flows, tuffs, and breccias, and a few dacite flows; interbedded  sandstone and shale.  Flows commonly porphyritic and gently dipping. Probably greater than 500 feet thick.",null,null,"RB002",202,"Ruby","Ign",1603,"TKvr"]
["Ks","Shaktolik group","late Early Cretaceous to Late Cretaceous","Graywacke, shale, grit, and conglomerate.   Type section on the Shaktolik River approximately 120 miles west of the Ruby quad.  Thickness estimated to be more that 4800 feet along the lower Yukon River.  Unit is obsolete and no longer used.  On map, this","plant fossils, marine mollusks",null,"RB002",301,"Ruby","Sed",2010,"Km"]
["Ku","Ungalik conglomerate","Cretaceous","Conglomerate, grit, some graywacke.  Boulders as much as 2 ft in diameter: Sorting and bedding poor.   Believed  to be several hundred ft thick on the Melozitna River north of the Ruby quad.   Patton and Bickel estimate minimum thickness of 1200 feet.  S",null,null,"RB002",302,"Ruby","Sed",2170,"Kuc"]
["Kc","Chert and argillite","Cretaceous","Chert and argillite with interbedded rhyolitic tuff, sandstone, and grit.","Fragmentary fossil imprint identified as small immature ammonite of Cretaceous or Jurassic type.",null,"RB002",303,"Ruby","Sed",5745,"Pig"]
["ira","Intrusive rocks","Pre-Cretaceous","Granite, monzonite and diorite altered to augen gniess and mica schist.  Locally contains younger granitic dikes.",null,null,"RB002",702,"Ruby","Meta",9325,"PzZrqs"]
["mi","Metamorphic igneous rock","Carboniferous (?) Late Paleozoic","Greenstone, locally some gray to red chert, greenstone tuff, and graywacke. Greenstone altered from  basalt, diabase, and andesite extrusives and diorite, diabase, gabbro, and pyroxenite intrusives.  In Nulato quad assigned a Carboniferous(?)  age.  May",null,null,"RB002",401,"Ruby","Meta",5133,"JMtu"]
["Dl","Limestone","Devonian","Dark-gray, partly recrystallized limestone carrying light-colored, crushed crinoid columns, and  associated slate, shale, and fine-grained arkose.  No longer on map, lumped in unit JMtu","light-colored, crushed crinoid columns",null,"RB002",801,"Ruby","Sed",6945,"Ds"]
["Ol","Limestone and dolomite","Ordovician","Dark-gray limestone and brownish-yellow dolomite. Dolomite is common near base of section.   Lies unconformably on older metamorphic rocks.  Massive unit overlain by thinner bedded limestone and dolomite, succeeded by the thickest beds of the series.  To",null,null,"RB002",901,"Ruby","Sed",7520,"Ont"]
["mc","Metamorphic complex","Precambrian or Paleozoic","Schist, crystalline limestone, quartzite, greenstone, slate, and phyllite.  Areas of crystalline limestone mapped separately when possible as mcl.",null,null,"RB002",501,"Ruby","Meta",8625,"PzZm"]
["mcl","Metamorphic complex","Precambrian or Paleozoic ( may contain Ordovician and Devonian)","Crystalline limestone, may  include rocks of Ordovican or Devonian but generally is more recystallized than Ordovican or Devonian rocks and is associated with schists.",null,null,"RB002",502,"Ruby","Meta",8620,"Pzrm"]
["mca","Metamorphic complex","Precambrian or Paleozoic","In eastern part of quad, metamorphic complex mapped as two units, mca and mcb.   The older unit, mca is composed of  crystalline limestone and greenstone with some schist and phyllite.",null,null,"RB002",504,"Ruby","Meta",8601,"PzZrqs"]
["mcb","Metamorphic complex","Precambrian or Paleozoic","The younger unit, mcb, contains schist and quatzite with some crystalline limestone, slate, and greenstone.",null,null,"RB002",503,"Ruby","Meta",8600,"YZnm"]
["Qac","Alluvium","Quaternary","Undifferentiated alluvial, colluvial, and eolian terrace and slope deposits.  Chiefly silt and very fine sand.  Terrace deposits largely fluival but in part lacustrine; slope deposits primarily eolian and colluvial.","The \"Palisades\" along the Yukon have yielded Pleistocene vertebrate fauna including mammoth and bison remains.",null,"MZ002",100,"Melozitna","Unconsol",100,"Qs"]
["Qfy","Younger flood-plain deposits","Quaternary","Light-gray micaceous silt.  Sand and gravel along streams that drain bendrock uplands.  Characterized physiographically by badrs, oxbows, meander scars, abandoned channels, and other evidence of recent flood-plain building.",null,null,"MZ002",110,"Melozitna","Unconsol",100,"Qs"]
["Qms","Modified eolian sand deposits","Quaternary","Dark-yellowish-orange and light-gray, fine- to medium-grained eolian sand.  Forms briad sheetlike dune field mantling older floodplain (Qfo) and alluvial terrace (Qac) deposits of the Dulbi Flats.  Deposits have a strong northeast-southwest trend.",null,null,"MZ002",120,"Melozitna","Unconsol",100,"Qs"]
["Qfo","Older flood-plain deposits","Quaternary","Chiefly light-gray and grayish-orange micaeous silt.  Locally include peat, reworked eolian sand and gravel.  Deposits at or near river level but youthful flood-plain features are much modified or absent.  Contact with Qfy locally gradational and poorly",null,null,"MZ002",130,"Melozitna","Unconsol",100,"Qs"]
["Qg","Glacial drift","Quaternary","Unsorted bouldery till and isolated moraines; may include some younger solifluction deposits near valley sides.",null,null,"MZ002",140,"Melozitna","Unconsol",100,"Qs"]
["Ts","Sandstone, Claystone, Conglomerate, and Lignite","Tertiary","Grayish-white granule conglomerate and sandstone, reddish-brown claystone, and lignite coal.  Exposed at river level at the \"Palisades\" along the Yukon River.","Pollen of probable Miocene age.",null,"MZ002",200,"Melozitna","Sed",640,"Tcb"]
["TKv","Volcanic rock","Tertiary to Late Cretaceous","Indian River, Takhakhdona Hills, and Dulbi River areas- light-gray to pink rhyolite tuff, welded (?) tuff, flows, and breccia.  Subordinate pumice, dark vitrophyre, and obsidian.  In Takhakhdona Hills also includesdark-green to black vesicular basalt flo","Obsidian chippings and artifacts found in archeological site in NW AK may have source in obsidian occurrence north of Little Indian River.","Flows in Tanana and Bettles quads have K-Ar date of 58 m.y.","MZ002",210,"Melozitna","Ign",1070,"Tvr"]
["Kg","Granodiorite","Late Cretaceous","Fine- to medium-grained  hornblende-biotite granodiorite with subordinate quartz monzonite and quartz diorite.  (Recoded NSA 2420 March, 1999, per Bill Patton.)",null,"K-Ar date of 82.3 and 89.0 m.y. from the Dulbatna Mountain pluton and 81.5 m.y. from the Indian Mountain pluton in adjoining Hughes quad","MZ002",300,"Melozitna","Ign",2420,"Kgd"]
["Kh","Hypabyssal rocks","Cretaceous","Small bodies of primarily dacite and rhyolite porphyry.  These intrusives are widespread in volcanic graywacke and mudstone unit (Kgm) and in andesitic rocks (Kv).",null,null,"MZ002",310,"Melozitna","Ign",2210,"Kve"]
["Kqc","Quartz-pebble conglomerate","early Late Cretaceous","Small isolated patches of light-gray quartz-pebble conglomerate and quartzose sandstone.  Minor intercalated with light-colored ashy tuff.  Conglomerate almost wholly of quartz and quartzite clasts.  Intruded and thermally altered by granodiorite (Kg)",null,null,"MZ002",320,"Melozitna","Sed",1990,"Kqc"]
["Ks","Sandstone, Quartz Conglomerate, shale, and siltstone","Probably Late Cretaceous","Non-marine deposits of olive-green, fine- to coarse-grained, crossbedded, quartzose sandstone and grit; quartz-pebble conglomerate, and dark micaeous shale and siltstone.  Ironstone lenses and concretions.  Better sorted and higher % quartz than Kgm.  Pr","Abundant carbonized plant debris",null,"MZ002",330,"Melozitna","Sed",1941,"Kss"]
["Kc","Igneous pebble-cobble conglomerate","late Early Cretaceous (Albian) may be as young as Late Cretaceous","Massive poorly sorted conglomerate with pebble to cobble sized clasts primarily of mafic intrusive and extrusive rocks and varied colored chert.  Interbedded with fine-grained to gritty (?) , dark-green to green graywacke and mudstone.  grades upward int","Indeterminate pelecypods",null,"MZ002",340,"Melozitna","Sed",2030,"Kcg"]
["Kgm","Volcanic graywacke and mudstone","late Early Cretaceous (Albian)","Dark-greenish-gray, fine-grained to gritty(?), poorly sorted graywacke composed largely of first- and second-cycle volcanic debris but locally containing abundant granitic and metamorphic rock debris. Graded bedding common,  Dark gray mudstone interbeds.",null,null,"MZ002",350,"Melozitna","Sed",2105,"Kvgm"]
["Ktg","Tuff, volcanic graywacke, and mudstone","Early Cretaceous","Volcaniclastic rocks of andesitic and dacitic composition.  Crystal-lithic tuff, lithic tuff, volcanic graywacke and mudstone.  Rare andesite flows.  Mapped only along northern edge of this quad and in adjoining HU quad.  Overlies Kv and may grad lateral",null,null,"MZ002",360,"Melozitna","Ign",2320,"Ktg"]
["Km","Quartz Monzonite","Early Cretaceous","Pinkish coarse-grained porphyritic biotite quartz monzonite.  Becomes gnessic in southern part of the Melozitna pluton.  Altered and slightly cataclastic in small pluton east of Gold Mountain.",null,"K-Ar date 111 m.y. from Melozitna pluton","MZ002",370,"Melozitna","Ign",2530,"Kg"]
["Kv","Andesitic volcanic rocks","Earliest Cretaceous (Neocomian) but may include Albian age strata","Koyukuk River- Pillow basalt and andesitic flows; andesitic tuffs, volcanic conglomerate, and breccia; chert and fine-grained cherty tuff; coquinoidal limestone composed largely of Buchia sp. Widely altered to a hard dark green hornfels.  Dulbi-Melozitna","Buchia sublaevis, belemnite; Buchia cf.B. crassicollis; Buchia keyserlingi",null,"MZ002",380,"Melozitna","Ign",2330,"Kve"]
["JPb","Basalt and diabase","Permian to Jurassic.","Spilitic basalt and diabase largely altered to greenstone.  Along contact with Km, altered to mafic hornfels.   Probabaly correlative with similar rocks on strike to the NE in the Tanana and Bettles quads",null,null,"MZ002",400,"Melozitna","Ign",5140,"JMab"]
["JPu","Ultramafics","Permian to Jurassic","Small bodies of serpentinized peridotite and dunite with closely associated gabbro and anorthosite.",null,null,"MZ002",410,"Melozitna","Ign",5150,"Jaum"]
["Pzm","Marble","Paleozoic","Small masses of white to light-gray coarsely crystalline dolomitic and calcareous marble.  Locally altered to calc-silicate hornfels",null,null,"MZ002",600,"Melozitna","Meta",5525,"Dm"]
["PzpCs","Pelitic schist","Paleozoic or Precambrian","Quartz-chlorite-muscovite schist and micaceous quartzite.  Greenschist facies metamorphism.  Subordinate micaceous quartzite and glaucophane-chlorite-muscovite schist.  Unit includes many small bodies of marble, greenstone and greenschist (believed to be",null,null,"MZ002",700,"Melozitna","Meta",9325,"PzZrqs"]
["PzpCq","Quartzite","Paleozoic or Precambrian","Fine-grained, light-gray quartzite and micaceous quartzite with subordinate quartz-mica schist, marble, and calc-silicate rock.  Stratigraphic relationship to PzpCs uncertain.",null,null,"MZ002",710,"Melozitna","Meta",8803,"PzZrpg"]
["PzpCn","Gneiss and quartzite","Paleozoic or Precambrian","Quartz-feldspar-biotite gneiss commonly garnetiferous and locally contains sillimanite.  Almandine-amphibolite facies metamorphism.  Some augen gneiss.  Gray coarse-grained quartzite with thin layers of biotite.  Subordinate quartz-mica schist, marble, a",null,null,"MZ002",720,"Melozitna","Meta",8801,"PzZrpg"]
["Qal","Alluvium","Quaternary","Silt, sand and gravel of streambeds, flood plains and terraces",null,null,"NL002",101,"Nulato","Unconsol",100,"Qs"]
["Tki","Intrusive Rocks","early Tertiary or Late Cretaceous","Granite and some diorite. Includes numerous dikes and sills and may include hornfels zones",null,null,"NL002",1650,"Nulato","Ign",1655,"TKg"]
["Ks","Shaktolik group","Late Cretaceous","Graywacke, shale, grit, and conglomerate.   Thickness estimated at 4800 feet.  Unit obsolete, no longer shown on map.","Marine mollusks (late Early K) and plant remains (Late K)",null,"NL002",301,"Nulato","Sed",2010,"Km"]
["Ku","Ungalik conglomerate",null,"Conglomerate, grit, some graywacke.  Clasts are angular to rounded.  Sorting and bedding are poor.  Boulders as much as 2 feet in diameter.  Type section is near the Ungalik River west of Nulato quad.  Thickness believed to be at least several hundred fe",null,null,"NL002",302,"Nulato","Sed",2170,"Kuc"]
["mi","Metamorphosed igneous rocks","post - Carboniferous","Greenstone, and locally some gray to red chert, dark-gray crystalline limestone, greenstone, tuff, and graywacke.  Greenstone is altered basalt and diabase of probable extrusive origin and diorite, diabase, gabbro, and pyroxenite of probable intrusive or",null,null,"NL002",401,"Nulato","Meta",5250,"MzPmi"]
["mc","Metamorphic complex","Late Precambrian or  Early Paleozoic","Quartz-mica schist, quatzite-schist, mica schist, albite-chlorite schist, albite-mica schist, ottrelite-mica schist, glaucophane-mica schist, some phyllite, slate, sheared chert, and quartzite.  Unit superceded.",null,null,"NL002",501,"Nulato","Meta",8625,"PzZm"]
["mcl","Metamorphic complex","Precambrian or Paleozoic","Recystallized limestone - superceded, see source NL003",null,null,"NL002",8610,"Nulato","Meta",8620,"Pzrm"]
["vr","Volcanic rocks","unknown","Chiefly basalt and andesite.  Rarely rhyolite, tuff, chert, agglomerate, and breccia.  Probably of several different ages.  Not shown on map as this unit, rather is NSACLASS 1000 and 2330",null,null,"NL002",601,"Nulato","Ign",5120,"MzPzi"]
["Qa","None","Quaternary","Alluvium",null,null,"OP002",101,"Ophir","Unconsol",100,"Qs"]
["Qu","None","Quaternary","Undifferientiated lowland silt, sand, muck, and gravel",null,null,"OP002",102,"Ophir","Unconsol",100,"Qs"]
["Qt","None","Quaternary","Terrace alluvium",null,null,"OP002",103,"Ophir","Unconsol",100,"Qs"]
["Qc","None","Quaternary","Colluvium",null,null,"OP002",104,"Ophir","Unconsol",100,"Qs"]
["TKv","Volcanics","Early Tertiary  and Late Cretaceous","Volcanics",null,null,"OP002",201,"Ophir","Ign",1600,"TKv"]
["TKc","Mafic to intermediate volcano-plutonic complexes","Early Tertiary  and Late Cretaceous","Mafic to intermediate volcano-plutonic complexes",null,null,"OP002",202,"Ophir","Ign",1630,"TKiv"]
["TKm","None","Early Tertiary  and Late Cretaceous","Monzonite",null,null,"OP002",203,"Ophir","Ign",1660,"TKm"]
["TKd","None","Early Tertiary  and Late Cretaceous","Dikes and subvolcanic rocks",null,null,"OP002",204,"Ophir","Ign",1601,"TKd"]
["TMg","None","Tertiary or Late Cretaceous (Not designated on map)","Gabbro",null,null,"OP002",205,"Ophir","Ign",1680,"TDg"]
["Ju","Ultramafic rocks","Late Jurassic","Ultramafic rocks",null,null,"OP002",301,"Ophir","Ign",3498,"Jtu"]
["ph","Harzburgite tectonite of Mount Hurst","Unknown","Harzburgite tectonite of Mount Hurst; relations uncertain",null,null,"OP002",401,"Ophir","Ign",5191,"Jium"]
["pc","Cumulate ultramafic rocks of Mount Hurst","Unknown","Cumulate ultramafic rocks of Mount Hurst: relations uncertain",null,null,"OP002",402,"Ophir","Ign",5191,"Jium"]
["Ks","Sandstone, shale, and conglomerate","Late Cretaceous","Sandstone, shale, and conglomerate",null,null,"OP002",501,"Ophir","Sed",2020,"Kme"]
["Ku","Undifferentiated clastic rocks","Late Cretaceous","Undifferentiated clastic rocks",null,null,"OP002",502,"Ophir","Sed",1970,"Kk"]
["Ksc","None","Late Cretaceous","Sandstone and conglomerate",null,null,"OP002",503,"Ophir","Sed",1985,"Kkn"]
["Kss","Fine sandstone, siltstone, and shale","Late Cretaceous","Fine sandstone, siltstone, and shale",null,null,"OP002",504,"Ophir","Sed",1970,"Kk"]
["Kls","None","Late Cretaceous","Limy volcaniclastic sandstone",null,null,"OP002",505,"Ophir","Sed",1942,"Kk"]
["Kac","None","Late Cretaceous","Agglomerate, chert, tuff, and sandstone",null,null,"OP002",506,"Ophir","Ign",2260,"Kvl"]
["Kvs","None","Late Cretaceous","Volcaniclastic sandstone",null,null,"OP002",507,"Ophir","Sed",1907,"Kvss"]
["Ksa","None","Late Cretaceous","Sandstone",null,null,"OP002",508,"Ophir","Sed",1906,"Ksa"]
["Ksh","None","Late Cretaceous","Shale and siltstone",null,null,"OP002",509,"Ophir","Sed",1905,"Ksh"]
["Kvg","Volcanic graywacke and conglomerate","Late Cretaceous","Volcanic graywacke and conglomerate",null,null,"OP002",510,"Ophir","Sed",2180,"Kvm"]
["TrMs","None","Triassic, Permian, Pennsylvanian, and Mississippian","Sandstone, grit, and argillite",null,null,"OP002",601,"Ophir","Sed",5021,"TrMis"]
["TrMc","Chert, argillite, and volcaniclastic rocks","Triassic, Permian, Pennsylvanian, and Mississippian","Chert, argillite, and volcaniclastic rocks",null,null,"OP002",602,"Ophir","Sed",5112,"TrMica"]
["TrMb","None","Triassic, Permian, Pennsylvanian, and Mississippian","Basalt, gabbro, and chert",null,null,"OP002",603,"Ophir","Ign",5133,"JMtu"]
["MDl","Limestone","Mississippian to Devonian","Limestone",null,null,"OP002",701,"Ophir","Sed",6380,"MDl"]
["Pzc","None","Early Paleozoic","Carbonates",null,null,"OP002",801,"Ophir","Sed",5340,"Pzrm"]
["PzpCs","Schistose metamorphic rocks","Early Paleozoic or Late Precambrian","Schistose metamorphic rocks",null,null,"OP002",802,"Ophir","Meta",8601,"PzZrqs"]
["btu","Bedrock unknown","Unknown but likely Precambrian or older","type unknown; relations uncertain",null,null,"OP002",9001,"Ophir","Unknown",9060,"pCu"]
["PzpCs/TrMc","None","Uncertain","Map shows questionable identification of unit.",null,null,"OP002",901,"Ophir","Uncertain",8601,"PzZrqs"]
["pc /TrMc","None","Uncertain","Map shows questionable identification of unit.",null,null,"OP002",902,"Ophir","Uncertain",99,"bu"]
["Qf",null,"Quaternary","Floodplain deposits",null,null,"?",100,"Kateel River","Unconsol",100,"Qs"]
["Qt","Terrace deposits","Quaternary","Terrace deposits",null,null,"KT?",101,"Kateel River","Unconsol",100,"Qs"]
["Qfy","Younger flood-plain deposits","Quaternary","Light-gray micaceous silt.  Sand and gravel along streams that drain bedrock uplands",null,null,"KT002",102,"Kateel River","Unconsol",100,"Qs"]
["Qna","Nogahabara sand dunes -- active dunes","Quaternary","Active dunes.  Circular body, nearly 5 mi in diameter.  Entriely sand, free of vegetation cover.",null,null,"KT002",110,"Kateel River","Unconsol",100,"Qs"]
["Qns","Nogahabara sand dunes -- stabilized dunes","Quaternary","Scattered circular and elliptical bodies of eolian sand.",null,null,"KT002",111,"Kateel River","Unconsol",100,"Qs"]
["Qfo","Older floodplain deposits","Quaternary","Chiefly light-gray and grayish-orange micaceous silt.  Locally includes peat, reworked eolian sand, and gravel",null,null,"KT002",103,"Kateel River","Unconsol",100,"Qs"]
["Qms","Modified eolian sand deposits","Quaternary","Dark-yellowish-orange and light-gray, fine- to medium-grained eolian sand.  Forms broad sheet-like dune field mantling alluvial silt deposits of the Koyukuk flats and all but tops of bedrock hills in vicinity of Roundabout Mountain.",null,null,"KT002",112,"Kateel River","Unconsol",100,"Qs"]
["Qhs","High terrace and slope deposits","Quaternary","Light-gray and grayish-orange micaceous silt.  Subordinate lenses of sand and peat.",null,null,"KT002",104,"Kateel River","Unconsol",100,"Qs"]
["QTb","Basalt","early Quaternary or late Tertiary","Nearly horizontal flows of vesicular olivine basalt.  Flows extruded over terrain of moderate relief, ranging in elevation from 175 to over 1,600 feet.",null,null,"KT002",500,"Kateel River","Ign",350,"QTb"]
["Kgs","Graywacke sandstone and mudstone","Cretaceous","Poorly sorted, muddy sandstone (graywacke) interbedded with mudstone.  Chiefly dark-greenish-gray to pale-olive tuffaceous and feldspathic, fine- to very coarse-grained sandstone and subordinate dark-gray mudstone.  Abundant lenses of feldspar and chert",null,null,null,200,"Kateel River","Sed",1825,"Kgw"]
["Kgm","Graywacke sandstone and mudstone","Early Cretaceous","Chiefly medium- to dark-gray mudstone and medium-gray to dark-greenish-gray moderately to highly calcareous fine-grained sandstone..  Sandstone locally contains thin lenses of feldspar and chert grit.  Mudstone commonly banded and finely cross-bedded.","Graptolites of Early Cretaceous age (Albian) age in adjoining Nulato quadrangle.  Not sure what unit though (Ks on pub. map but this doesn't match)",null,"KT002",201,"Kateel River","Sed",2152,"Km"]
["Kn","Nonmarine shale, siltstone and sandstone","Late Cretaceous","Nonmarine deposits of drak-gray to olive-gray micaceous shale and siltstone, and light-olive-gray to yellowish-orange, fine- to coarse-grained, crossbedded sandstone.  Massive sandstone beds near base of unit.  Coarse detrital fraction of sandstone chief","Abundant, well preserved flora.",null,"KT002",210,"Kateel River","Sed",2021,"Kme"]
["Km","Marine shale and siltstone","Early Cretaceous","Littorial and offshore marine deposits of dark-gray shale and siltstone interbedded with subordinate dark-greenish-gray fine-grained sandstone in lower part and light-olive fine- to coarse-grained crossbedded sandstone in upper part.  Volcanic conglomera","Widespread occurrence of Inoceramus altiflummis (McLearn) of Early Cretaceous (Albian) age",null,"KT002",211,"Kateel River","Sed",2101,"Ksse"]
["Knm","Undifferentiated sedimentary rocks","Cretaceous","Undifferientiated units Km and Kn, western part of map.",null,null,"KT002",212,"Kateel River","Sed",2021,"Kms"]
["Kvg",null,"Cretaceous","Volcanic graywacke conglomerate",null,null,"?",200,"Kateel River","Sed",1908,"Kvg"]
["Kvm",null,"Cretaceous","Volcanic graywacke conglomerate and mudstone",null,null,"?",201,"Kateel River","Sed",1825,"Kvm"]
["Kg","Granitic rocks","Cretaceous","Granitic rocks of acidic and intermediate composition  Chiefly syenite at Roundabout Mountain and albite granite on Huslia River-Derby Creek divide.",null,null,"KT002",600,"Kateel River","Ign",2410,"Kg"]
["KJv","Andesitic volcanic rocks","Cretaceous and Jurassic(?)","Chiefly porphyritic pyroxene andesite and trachyandesite flows, andesitic crystal and lithic tuff, and massive andesite breccia, agglomerate, and conglomerate.  Commonly altered and therefore pale green.  Interbedded dark-greenish-gray tuffaceous graywac","Buchia subokensis of earliest Cretaceous age in interbedded sedimentary rocks.",null,"KT002",800,"Kateel River","Ign",2330,"Kve"]
["Pzs","Limestone and schist","Paleozoic","Limestone and schist",null,null,"KT002",300,"Kateel River","Sed",5310,"DCd"]
["Pzl","Limestone and schist","Paleozoic","Limestone and schist",null,null,"KT002",301,"Kateel River","Sed",5320,"Pzld"]
["Pzls","Limestone and schist","Paleozoic","Limestone and schist",null,null,"KT002",302,"Kateel River","Sed",5320,"Pzld"]
["Qac","Undifferentiated alluvial, colluvial, and eolian terrace and slope deposits","Quaternary","Chiefly silt and very fine sand.  Includes extensive loess deposits",null,null,"MD002",105,"Medfra","Unconsol",100,"Qs"]
["Qfy","Younger flood-plain deposits","Quaternary","Silt, sand, and gravel",null,null,"MD002",101,"Medfra","Unconsol",100,"Qs"]
["Qfo","Older flood-plain deposits","Quaternary","Largely silt and sand but probably includes abundant gravel along Tonzona River.",null,null,"MD002",102,"Medfra","Unconsol",100,"Qs"]
["Qms","Modified eolian sand deposits","Quaternary","Sheetlike dune fields of tan fine- to medium-grained eolian sand, locally overlain by peat and loess",null,null,"MD002",103,"Medfra","Unconsol",100,"Qs"]
["Qg","Glacial drift","Quaternary","Unsorted bouldery till",null,null,"MD002",104,"Medfra","Unconsol",100,"Qs"]
["QTg","Gravel deposits on Jones Creek","Quaternary-Tertiary","Moderately dipping gravel exposed on Jones Creek near Nixon Fork fault, approximately 25 m thick",null,null,"MD002",151,"Medfra","Unconsol",100,"Qs"]
["TKn","Volcanic rocks of the Nowitna River area","Latest Cretaceous, Earliest Tertiary","Chiefly subaerial flows of trachyandesite, basaltic andesite, and basalt.  Subordinate intercalated flows and tuffs of rhyolite and dacite.",null,"63 to 64 Ma","MD002",202,"Medfra","Ign",1605,"TKvi"]
["TKnr","Volcanic rocks of the Nowitna River area -- rhyolite","Latest Cretaceous, earliest Tertiary","Altered rhyolite domes and associated rhyolitic tuff and breccia.",null,null,"MD002",201,"Medfra","Ign",1603,"TKvr"]
["TKc","Mafic to intermediate Volcano-plutonic complexes","Latest Cretaceous, earliest Tertiary","Altered basalt, andesite, and trachyandesite porphyry flows and hypabyssal intrusive bodies.  Altered mafic and intermediate crystal and lithic tuffs.  Subordinate olivine basalt and dacite flows.",null,"K-Ar ages of 65-71 Ma","MD002",204,"Medfra","Ign",1630,"TKiv"]
["TKcm","Mafic to intermediate volcano-plutonic complexes -- monzonite","Latest Cretaceous, earliest Tertiary","Small bodies of monzonite, quartz monzonite, and granodiorite",null,null,"MD002",203,"Medfra","Ign",1650,"TKi"]
["TKg","Granite","Latest Cretaceous, earliest Tertiary","White to light gray, fine- to coarse-grained biotite granite.",null,"63-71 Ma","MD002",211,"Medfra","Ign",1655,"TKg"]
["TKm","Monzonite","Latest Cretaceous, earliest Tertiary","Includes monzonite, quartz monzonite, quartz monzodiorite, and monzodiorite.  Subordinate monzogabbro and gabbro",null,"66-70 Ma","MD002",205,"Medfra","Ign",1660,"TKm"]
["TKv","Volcanic rocks of Nixon Fork-Upper Sulukna River area","Latest Cretaceous, earliest Tertiary","Sills, dikes, flows, and plugs of rhyolite, dacite, and trachyandesite.",null,"62-67 Ma","MD002",206,"Medfra","Ign",1603,"TKvr"]
["TKs","Volcanic rocks of the Sischu Mountains","Latest Cretaceous, earliest Tertiary","Light-gray to purplish-red banded rhyolite and dacite subaerial flows and domes, locally containing interlayered breccia and tuff.",null,"66-71 Ma","MD002",207,"Medfra","Ign",1603,"TKvr"]
["TKsc","Conglomerate, sandstone, and lignite","Latest Cretaceous, earliest Tertiary","Conglomerate, sandstone, and lignite.",null,null,"MD002",209,"Medfra","Sed",1510,"TKcg"]
["TKsa",null,"Latest Cretaceous, earliest Tertiary","Dike-like body of dark-brown to gray andesite porphyry.",null,null,"MD002",208,"Medfra","Ign",1601,"TKd"]
["TDg","Undifferentiated gabbro","Devonian to Tertiary","Sills, dikes, and small plutons of gabbro intruding rocks of early Paleozoic and preCambrian(?) age",null,null,"MD002",210,"Medfra","Ign",1680,"TDg"]
["Ksu","Undifferentiated shale, siltstone, and sandstone","Cretaceous, early and late [possible Permian(?)]","Chiefly dark-gray carbonaceous, largely nonfossiliferous shale, siltstone, and very fine-grained sandstone.  Includes massive limestone conglomerate of uncertain age and stratigraphic affinities.  Conglomerate clasts consist of Paleozoic limestone and un","reworked Paleozoic",null,"MD002",301,"Medfra","Sed",1970,"Kk"]
["Ksc","Sandstone and conglomerate","Late Cretaceous","Chiefly fine- to coarse-grained, greenish-gray to gray, thinly cross-bedded \"salt and pepper\" sandstone and quartz-chert pebble conglomerate.  Poorly exposed interbeds of dark shale and siltstone.","locally abundant plants and fresh and brackish water mollusks",null,"MD002",302,"Medfra","Sed",1985,"Kkn"]
["Kss","Fine sandstone, siltstone, and shale","early Late Cretaceous (Cenomanian)","Fine- to medium-grained, dark-greenish-gray, thinly cross-bedded, fossiliferous sandstone and poorly exposed dark-gray siltstone and shale.","Inoceramus concentricus, and I. pictus",null,"MD002",303,"Medfra","Sed",1940,"Kk"]
["Kqc","Quartz-carbonate sandstone and pebbly mudstone","Early Cretaceous (Valanginian, Hauterivian, Barremian, Aptian)","Fine- to coarse-grained quartz-carbonate sandstone and conglomerate, quartzose limestone and dark-gray pebbly mudstone and siltstone.","Buchia sublevis, B. crassicolis, Cylindroteuthis, Inoceramus, Acroteuthis, Tropaeum",null,"MD002",305,"Medfra","Sed",2125,"Ksm"]
["Kvg","Volcanic graywacke and conglomerate","earliest Cretaceous","Poorly sorted fine- to coarse-grained graywacke, sandstone, grit, and pebble to cobble conglomerate composed chiefly of volcanic rock and chert detritus; interbedded dark mudstone.","Inoceramus",null,"MD002",304,"Medfra","Sed",2180,"Kvm"]
["JTrt","Cherty tuff, crystal and lithic tuff, and volcanic breccia","Triassic and possible early Jurassic","Dark-greenish, very fine grained cherty tuff grading into greenish-gray radiolarian chert.  Fine to coarse-grained dark greenish-gray crystal and lithic tuff.  Volcanic breccia and conglomerate composed of poorly sorted clasts of mafic volcanic rocks and","Radiolaria and conodonts",null,"MD002",401,"Medfra","Ign",3851,"JTrta"]
["Trs","Spiculite and sandy limestone","Late Triassic (Norian)","Dark-gray banded spiculite and chert, yellowish-orange-weathering sandy fossiliferous limestone and conglomerate and dark-gray shale","Monotis ochotica, M. of M. scutiformis, Halobia, Heterastridium",null,"MD002",402,"Medfra","Sed",4032,"Trsl"]
["Ps","Sandstone, sandy limestone, and conglomerate","Permian","Fine- to coarse-grained yellowish-orange-weathering sandstone, limy sandstone, siltstone, and conglomerate.","Kuvelousia, Spiriferella, Waagenoconcha",null,"MD002",501,"Medfra","Sed",6010,"PDsc"]
["PMc","Chert and limestone","Pennsylvanian and Mississippian","Chiefly greenish-gray, dark-gray to black, and red radiolarian chert.","Radiolarians",null,"MD002",502,"Medfra","Sed",6080,"TrMica"]
["TPMcl","Limestone and sandstone","Mississippian","Lenticular beds of fossiliferous limestone having subordinate beds of sandy limestone, chert grit, and arkosic sandstone.","Conodonts and foraminifera",null,"MD002",503,"Medfra","Sed",6320,"MDl"]
["DOsl","Shaly limestone","Ordovician to Middle Devonian","Dark-gray to grayish-orange finely laminated limestone and dolomitic limestone.  Suborbinate laminated dolomite, dark chert, and silicous siltstone.  Interpreted as deep-water facies of Osl, Od, and DSl carbonate units.","Conodonts",null,"MD002",508,"Medfra","Sed",5310,"DCd"]
["DSl","Reefy limestone and dolomite","Late Silurian, Early Devonian (Siegenian-Emsian), early Late Devonian (Frasnian)","Unit composed of a lower sequence of dolomite containing ostracodes of probable Late Silurian age, a middle sequence of mixed limestone and dolomite having favostid reefs and shelly fossils of probable Early Devonian age and an upper sequence of Amphipor","ostracodes, favostid, Ampihpora, Smithiphyllum",null,"MD002",504,"Medfra","Sed",6960,"DSwc"]
["Sls","Thin-bedded limestone","Silurian (latest Llandoverian to early Wenlockian)","Dark-gray to black platy limestone and limy shale.","graptolites",null,"MD002",505,"Medfra","Sed",6620,"Spf"]
["Od","Massive dolomite and limestone","Middle to Late Ordovician (White Rockian to Maysvillian)","Light-brown to dark-gray massive dolomite and limestone cyclically interbedded with shallow-water yellowish-orange-weathering algal and lime mudstone.","Gastropods, corals, brachiopods, ostracodes, conodonts",null,"MD002",506,"Medfra","Sed",7520,"Ont"]
["Osl","Silty limestone and siltstone","Early Ordovician","Chiefly yellowish-orange-weathering, thin-bedded, shallow-water, silty limestone and limy siltstone.","Conodonts, trilobites, gastropods, cephalopods",null,"MD002",507,"Medfra","Sed",7520,"Ont"]
["Pzc","Chert and phyllite","early Paleozoic","Banded light-gray to black sooty impure radiolarian chert, green talcy phyllite and slate, thin-bedded shaly limestone, and calcareous quartzite.",null,null,"MD002",509,"Medfra","Meta",7580,"SCpl"]
["PzpCq","Quartzite, grit, and argillite","early Paleozoic or preCambrian","Fine- to coarse-grained quartzite, quartz grit, quartz-feldspar grit, and argillite grading upward in to very fine grained quartzite, argillite, calcareous argillite, phyllite, and chert.",null,null,"MD002",601,"Medfra","Meta",8300,"CZw"]
["PzpCs","Quartzite, grit, and argillite","early Paleozoic or preCambrian","Sheared and foliated quartz and quartz-feldspar grits and quartzite intercalated with quartz-muscovite-chlorite and quartz-muscovite-biotite schists.  Subordinate phyllite, thin limestone, and metachert.",null,"276 Ma K-Ar muscovite and 421 Ma K-ar(?) hornblende on intrusion (?) to unit.","MD002",602,"Medfra","Meta",8640,"YZns"]
["PzpCv","Metavolcanic rocks","early Paleozoic or preCambrian","Tan, light-gray, pink, and green banded fine-grained felsic volcanic rocks having well-developed foliation.  Cheifly porphyry composed of large phenocrysts of embayed quartz and plagioclase in a very fine grained quartzo-feldspathic groundmass which has",null,null,"MD002",603,"Medfra","Meta",8700,"YZnv"]
["PzpCc","Calc-shist","early Paleozoic or preCambrian","Light to medium-gray calc-schist and thin-bedded schistose impure marble  White to light-gray, fine-grained massive sandy marble.  Subordinate quartz-mica schist.",null,null,"MD002",604,"Medfra","Meta",8610,"YZnc"]
["PzpCp","Pelitic schist","early Paleozoic or preCambrian","Chiefly pelitic and quartzose metasedimentary rocks of greenschist facies.  Light-gray micaceous quartzite and greenish quartz-chlorite-muscovite schist grading into dark-gray quartz-muscovite-biotite-garnet schist.  Subordinate calc schist and marble.",null,"K-Ar mica ages from 274-514 Ma, correlatives as old as 921 Ma","MD002",605,"Medfra","Meta",8640,"YZns"]
["Qs","Surficial deposits","Quaternary","Glacial drift of several ages, including moraines, outwash, and lake deposits; alluvium and colluvium.  All mainly consist of unconsolidated gravel, sand, silt, and clay.",null,null,"HE002",100,"Healy","Unconsol",100,"Qs"]
["Thd","Hornblende dacite","Pliocene","Subvolcanic intrusive rocks (hornblende dacite) of Jumbo Dome",null,"K-Ar hornblende age of 2.79 Ma","HE002",1022,"Healy","Ign",1022,"Thd"]
["Tn","Nenana gravel","Pliocene and Miocene","Poorly consolidated, buff to reddish-brown, fluvial sequence of pebble- to boulder-conglomerate and coarse-grained sandstone with interbedded mudflow deposits, thin claystone layers, and local thin lignite beds.",null,null,"HE002",570,"Healy","Sed",570,"Tn"]
["Tcb","Coal-bearing rocks","Miocene to Eocene","Unit mostly comprises in ascending order, the Healy Creek, Sanctuary, Suntrana, Lignite Creek, and Grubstake Formations.  Coal-bearing rocks comprise terrestrial cyclical sequences, having varying proportions of siltstone, claystone, mudstone, shale, gen","Floral assemblages",null,"HE002",645,"Healy","Sed",640,"Tcb"]
["Ts","Sedimentary rocks","Miocene? to Paleocene?","Poorly consolidated, fluviatile sequence of dark-gray shale, yellowish-gray sandstone, siltstone, and pebble conglomerate (consisting of dominantly gray quartz and black chert clasts).","Indeterminate plants",null,"HE002",500,"Healy","Sed",500,"Tsu"]
["Tvv","Volcanic rocks -- volcanic flows, pyroclastic rocks, and subordinate subvolcanic intrusive rocks","Oligocene to Paleocene","Subaerial flows and associated pyroclastic rocks ranging in composition from rhyolite to basalt.  Tend to be dominantly moderately altered rhyolite and basalt, but andesite, dacite, and latitie also occur",null,"K-Ar sanidene age of 53.9 Ma on rhyolite","HE002",1000,"Healy","Ign",1000,"Tvu"]
["Tvim","Volcanic rocks -- mafic subvolcanic intrusive rocks","Oligocene to Paleocene","Dikes and small hypabyssal bodies of dark-gray basalt, diabase, and subordinate andesite",null,"K-Ar age of 54.7 Ma on basalt dike","HE002",1012,"Healy","Ign",1012,"Thm"]
["Tvif","Volcanic rocks -- felsic subvolcanic intrusive rocks","Oligocene to Paleocene","Dikes and small hypabyssal bodies with subordinate associated pyroclastic rocks, of dominantly tan-colored, aphanitic to very fine grained, locally porphyritic rhyolite, quartz latite, latite, and dacite.",null,"K-Ar ages ranging 32.5 to 35.2 Ma on rhyolite","HE002",1011,"Healy","Ign",1011,"Thf"]
["Tfv","Fluviatile and subordinate volcanic rocks","early Eocene?","Intercalated, fluviatile, only slightly deformed sequence of conglomerate, sandstone, siltstone, and mudstone, and a few interlayed thin flows of basaltic andesite.  Clasts in conglomerate contain Late Devonian conodonts.","Metasequoia occidentalis (Newberry) Chaney",null,"HE002",880,"Healy","Sed",880,"Tfv"]
["Tcv","Cantwell Formation -- volcanic rocks subunit","Paleocene","Intercalated, moderately deformed sequence of andesite, generally zeolitized basalt, rhyolite and dacite flows, dominantly felsic pyroclastic rocks, a few interbeds of sandstone and carbonaceous mudstone, and a few small bodies of related subvolcanic int",null,"K-ar Hornblende age of 64.6 Ma on dacite, basalt, andesite, and diabase ages ranging from 50.9 (>42.9 min.) to 61.0 (>62.2 min.) Ma","HE002",1140,"Healy","Ign",1140,"Tcv"]
["Tcs","Cantwell Formation -- sedimentary rocks subunit","Paleocene","Fluviatile, intercalated sequence, in various proportions, of dominantly polymictic conglomerate, sandstone (including arkose), siltstone, argillite, shale, and a few thin coal beds.  Locally contains thin flows and related tuff layers of mafic to interm","Plant fossils of Paleocene age, including Metasequoia occidentalis (Newberry) Chaney","K-Ar biotite ages  on granitic intrusions were 71.9 and 78.7 Ma, ages of dubious geologic value.","HE002",920,"Healy","Sed",1920,"Kcs"]
["Tgr","Granitic rocks","Oligocene to Paleocene","Wide variety of epizonal granitic rocks, most commonly granite and grandiorite but including tonalite and quartz monzodiorite.",null,"K-Ar ages ranging from 36.7 to 59.8 Ma","HE002",1221,"Healy","Ign",1300,"Tegr"]
["Tgrv","Granitic and volcanic rocks, undivided","Oligocene to Paleocene","Extensive border zone between rocks of late Tertiary granitic pluton (unit Tgr) and slightly younger, numerous felsic dikes and small subvolcanic intrusive rocks (unit Tvv), as well as small erosional remnants of rhyolite flows capping pluton.",null,null,"HE002",1210,"Healy","Ign",1210,"Tiv"]
["TKgr","Granitic and hypabyssal intrusive rocks","Paleocene? and Late Cretaceous","Two small granodiorite plutons of medium-grained granodiorite",null,"K-Ar biotite ages of 71.9 and 78.7 Ma, probably of dubious geologic meaning (very low K2O in biotite)","HE002",1655,"Healy","Ign",1655,"TKg"]
["TrPzvs","Volcanic and sedimentary rocks of the Talkeetna superterrane","Triassic and Paleozoic","Appears only in cross-sections",null,null,"HE002",5030,"Healy","Ign",5030,"TrPzvs"]
["Kvb","Basaltic subvolcanic rocks","Late Cretaceous","Dark-gray to black, porphyritic basalt, occurring in dike swarms.  Only know to intrude preCambrian and Paleozoic rocks (units PzpCp and Dmb).",null,"K-Ar hornblende age of 79.1 Ma on basalt","HE002",2256,"Healy","Ign",2256,"Kvl"]
["MDt","Totatlanika Schist","Early Mississippian to Middle Devonian","Predominantly metavolcanic and metavolcaniclastic (both felsic and mafic), and subordinate amounts of intercalated metasedimentary rocks such as black pelitic schist, and at one lacality a thin interbed of fossiliferous marble.","Crinoids, gastropods, Syringopora sp., conodont Polygnathus sp.",null,"HE002",6510,"Healy","Meta",6510,"MDt"]
["MDt?","Totatlanika Schist?","Early Mississippian to Middle Devonian","Predominantly metavolcanic and metavolcaniclastic (both felsic and mafic), and subordinate amounts of intercalated metasedimentary rocks such as black pelitic schist, and at one lacality a thin interbed of fossiliferous marble.",null,null,"HE002",6511,"Healy","Meta",6510,"MDt?"]
["Dmf","Felsic metavolcanic rocks","Late Devonian?","Massive, thick section of generally dark- to medium-gray, fine- to medium-grained schists and locally phyllites, with relict phenocrysts of quartz, orthoclase, and plagioclase.","Conodonts from interbeds of unit Dmb",null,"HE002",7243,"Healy","Meta",7240,"Dyv"]
["Dmb","Metabasalt and subordinate metasedimentary rocks","Late Devonian","600 m thick intercalated sequence of schistose and phyllitic, generally medium to dark greenish-gray, fine-grained and massive metabasalt; dark gray to black, generally fine-grained carbonaceous pelitic schist and phyllite and associated metasiltstone; a","Conodonts Palmatolepis sp., Iciodus sp., Polygnathus sp.","K-Ar muscovite age of 114.6 Ma on black phyllite","HE002",7320,"Healy","Meta",7320,"Pzsc"]
["Dms","Metasedimentary rocks","Late Devonian","Intercalated, generally thinly bedded, locally laminated, thick, marine sequence of dark-gray to black, carbonaceous, fine-grained, carbonaceous, fine-grained pelitic schist or phyllite; dark-gray, fine-grained, carbonaceous metasiltstone (quartzose phyl","Amphipora? sp., Disphyllum? sp., Grypophyllum? sp., Phillipsastraea? sp., Tabulophyllum? sp.",null,"HE002",7300,"Healy","Meta",7300,"Pzsc"]
["Pzk","Keevy Peak Formation","early Paleozoic","Intercalated sequence of fine- to medium-grained quartz-sericite or muscovite schist, fine-grained black quartzite, black carbonaceous pelitic schist and phyllite, stretched pebble conglomerate, greenish-gray or purple schist and slate, and a few thin ma",null,null,"HE002",5660,"Healy","Meta",5660,"Pzk"]
["PzpCp","Pelitic and quartzose schist sequence [old, abandoned Birch Creek Schist]","early Paleozoic and preCambrian?","Intercalated in various proportions: medium- to fine-grained, generally medium-gray quartz-sericite and (or) muscovite pelitic schist; fine- to medium-grained, medium-gray quartzite; quartz-sericite and (or) muscovite-calcite pelitic schist; fine-grained",null,null,"HE002",8630,"Healy","Meta",9322,"PzZaqs"]
["Trcs","Calcareous sedimentary rocks","Late Triassic; middle? Norian to late Karnian","A generally thin-bedded, commonly cross-bedded, carbonaceous, dark- to medium-gray, marine, intensely deformed thick sequence of intercalated calcareous shale, argillite, sandstone, siltstone, and sandy to silty and argillaceous limestone.  Sequence also","Conondonts: Neogondolella polygnathiformis, Epigondolella primitia, also Monotis cf. M. subcircularis, Chrondites sp.",null,"HE002",4033,"Healy","Sed",4033,"Trcs"]
["Dy","Yanert Fork sequence","Late Devonian","Intensely deformed, thick marine sequence of dominantly metasedimentary and metavolcanic rocks.  Bulk of sequence is dark-gray to black carbonaceous shale with intercalations of thin-bedded, commonly bioturbated, medium- to dark-gray, normally graded, bo","Radiolarians, conodont Palmatolepis sp.",null,"HE002",7242,"Healy","Meta",7242,"Dy"]
["Kva","Andesitic subvolcanic rocks","Late Cretaceous","Two large sills or dikes consisting of altered, medium-greenish-gray, porphyritic hornblende andesite.",null,"K-Ar on hornblende of 97.3 Ma","HE002",2255,"Healy","Ign",2255,"Kvl"]
["KJf","Flysch sequence","Early Cretaceous and Late Jurassic","Monotonous, intensely deformed and locally highly metamorphosed, probably several thousand of meters thick, flyschlike turbidite sequence.  Consists of dark-gray to black argillite; fine- to coarse-grained, generally dark-gray polymict pebble conglomerat","Fossils sparse but age considered well controlled","K-Ar reset ages yielded Late Cretaceous and Tertiary","HE002",2850,"Healy","Sed",2850,"KJf"]
["KJfk","Overthrust flyschlike rocks","Early Cretaceous -- Late Jurassic","Same as unit KJf, mapped separately for structural reasons.  Monotonous, intensely deformed and locally highly metamorphosed, probably several thousand of meters thick, flyschlike turbidite sequence.  Consists of dark-gray to black argillite; fine- to co","Fossils sparse but age considered well controlled","K-Ar reset ages yielded Late Cretaceous and Tertiary","HE002",2851,"Healy","Sed",2851,"KJfk"]
["KJcg","Conglomerate, sandstone, siltstone, shale, and volcanic rocks","Early Cretaceous and Late Jurassic","Intercalated sequence of polymictic pebble and cobble conglomerate, sandstone, siltstone, shale, and flows and dikes of andesitic to latitic feldspar porphyry.","Buchi spp.",null,"HE002",2821,"Healy","Sed",2821,"KJcg"]
["Trvs","Metavolcanic, metavolcaniclastic, and subordinate metasedimentary rocks","Late Triassic; late Norian","Consists of intercalated sequences several hundreds of meters thick, ocurring as thrust slices.  Most common rock type is dark-greenish-gray aphanitic metabasalt contiaing numerous amygdules and occurring in thick, commonly pillowed massive flows.  Metav","Monotis subcircularis, Heterastridium sp.",null,"HE002",4440,"Healy","Meta",4440,"Trmm"]
["Trcn","Chitistone and Nizina Limestones, undivided","Late Triassic; early Norian and Late Karnian","consists variably of medium- to thick-bedded, medium-gray weathering, brownish-gray lime mudstone with chert nodules and streamers, or medium- to thin-bedded, commonly thinly laminated, dark-gray to dark-brownish-gray lime mudstone, or thin- to medium-be","Halobia sp. and several conodonts",null,"HE002",4030,"Healy","Sed",4030,"JTrlm"]
["Trn","Nikolai Greenstone","Late and (or) Middle Triassic","An over 3,000-m-thick, slightly metamorphosed sequence of massive basalt flows with subordinate amounts of intercalated basaltic tuff and breccia, some bedded volcaniclastic rocks such as pebble conglomerate, sandstone, and siltstone, and possibly a few","Halobia superba collected from an interbed?",null,"HE002",4420,"Healy","Ign",4420,"Trn"]
["TrPam","Metasedimentary rocks sequence","Middle Triassic to Late Pennsylvanian","Lower and principal part of section (700-m-thick) consists of black argillite with laminae and thin interbeds of volcanic sandstone and lesser amounts of thin-bedded crinoidal limestone, apparently turbidite deposits forming discontinuous interbeds as mu","Crinoids, conodonts, radiolaria",null,"HE002",5202,"Healy","Meta",5202,"Pe"]
["PPav","Andesitic volcanic rocks (Correlated with Tetelna Volcanics)","Early Permian? and Pennsylvanian","Over 2,000-m-thick sequence of gray-green massive volcanic flows, breccias, and subordinate volcaniclastic rocks, all largely andesitic in composition.",null,null,"HE002",6120,"Healy","Ign",6120,"Pat"]
["Kgr","Granitic rocks","Late and Early Cretaceous","Most commonly tonalite but granodiorite, quartz diorite, diorite, and quartz monzodiorite.",null,"K-Ar age range from 105 to 49 Ma, most 50 to 70 Ma thought to be reset.  For NSAclass coding, ages less than 85 Ma = 2460, ages 85-110 Ma = 2470, all others = 2410","HE002",2410,"Healy","Ign",2460,"Kg"]
["KJum","Ultramafic rocks","Early Cretaceous or Jurassic","Dark greenish- or brownish-gray, coarse- to medium-grained, plagioclase-bearing ultramafic that occurs in a small, sill-like intrusive",null,null,"HE002",2945,"Healy","Ign",2945,"Jum"]
["Kgrt","Tourmaline-bearing granite","Late or Early Cretaceous","Medium- to fine-grained, tourmaline bearing granite with a granitic to seriate texture.",null,null,"HE002",2411,"Healy","Ign",2411,"Kgt"]
["Jgb","Alkalic gabbro","Late Jurassic","Extremely heterogeneous series of alkali gabbros, ranging from mafic theralites through essexites and monzogabbros into monzodiorites and monzonites.",null,"K-Ar age on biotite and hornblende 132 and 146 Ma","HE002",3390,"Healy","Ign",3390,"Jmu"]
["Dmg","Metagabbro","Late Devonian?","Dark greenish-gray, fine- to medium-grined, well-foliated gabbro.",null,null,"HE002",7330,"Healy","Meta",7330,"Dmg"]
["KJa","Argillite, chert, sandstone, and limestone","Early Cretaceous and Late Jurassic","Dark-gray argillite, dark-gray to greenish-gray bedded chert, thick-bedded gray sandstone, thin-bedded gray sandstone, and rare thin beds of shelly limestone.","Radiolarians, Inoceramus sp., Buchia sublaevis",null,"HE002",2820,"Healy","Sed",2820,"KJfn"]
["JTrrs","Red and brown sedimentary rocks and basalt","Early Jurassic and Late Triassic","Maximum thickness of more than 2,000m.  Basal part consists of a red-bed sequence of sandstone, siltstone, argillite, and conglomerate, with a few thin interbeds of brown fossiliferous sandstone, pink to light-gray dense limestone, and intercalated basal",null,null,"HE002",3830,"Healy","Sed",3830,"JTrsu"]
["Trlb","Limestome and basalt sequence","Late Triassic; Norian?","Interlayed sequence, at least several hundreds of meters thick, of limestone, partly recrystallized to marble, and flows of altered amygdaloidal basalt.","Spondylospira(?) sp.",null,"HE002",4021,"Healy","Sed",4021,"Trlb"]
["Trr","Red beds","Late Triassic","About 500 m of red sanstone, siltstone, argillite, and conglomerate, similar to red beds of unit JTrrs",null,null,"HE002",4060,"Healy","Sed",4060,"Trr"]
["TrDv","Volcanogenic and sedimentary rocks","Early Triassic to Late Devonian","Heterogeneous intercalated sequence over 500m thick, of greenish-gray to black tuffaceous chert, volcanic conglomerate, lesser amounts of maroon volcanic mudstone, breccia composed largely of basaltic detritus, laminated flyschlike graywacke and shale, l","Ammonites, conodonts, brachiopods",null,"HE002",5110,"Healy","Meta",5110,"TrDv"]
["Dsb","Serpentinite, basalt, chert, and gabbro","Late Devonian","Tectonically intermixed assemblage a few hundreds of meters thick largely of sheared serpentinite.  Remaining component rocks occur in varying proportion is in lenticular and podiform tectonic blocks as much as several hundred meters in extent.","Radiolarians",null,"HE002",7325,"Healy","Meta",7325,"Dmgs"]
["KJfl","Flysch sequence","earliest Late Cretaceous (Cenomanian) to Late Jurassic","Lithologically identical to rocks of unit KJf:  Monotonous, intensely deformed and locally highly metamorphosed, probably several thousand of meters thick, flyschlike turbidite sequence.  Consists of dark-gray to black argillite; fine- to coarse-grained,","Only mapped flysch unit to have fossils as young as earliest Late Cretaceous (Cenomanian).",null,"HE002",2852,"Healy","Sed",2852,"KJfk"]
["JTrta","Crystal tuff, argillite, chert, graywacke, and limestone","Late Jurassic to Late Triassic?","Four-fifths of the sequence is composed of massive cliff-forming crystal tuff, while remaining rocks form a narrow belt along western margin of unit.  Contact between two parts of sequence may be tectonic.  Crystal tuff is light- to dark-gray, locally ha","Radiolarians (of Callovian to early Tithonian age [Late Jurassic]), Artoasteroceras jeleskyi, Paltechioceras (Orthechioceras?) sp., Weyla sp. indicating a late Sinemurian (Early Jurassic) age",null,"HE002",3850,"Healy","Ign",3850,"JTrct"]
["Trcg","Conglomerate and volcanic sandstone","Late Triassic; late Norian","Lower part (40-50 m) of three unit division consists of cobble to boulder conglomerate composed of green volcanic rocks and red radiolarian chert clasts.  Middle part, 40 to 50 m thick, composes of finer grained volcanogenic (andesitic?) conglomerate con","Permian radiolaria in lower part in clasts; Heterastridium sp. (Late Triassic, late Norian) in middle",null,"HE002",4050,"Healy","Sed",4050,"Trcg"]
["DOs","Sedimentary sequence","Middle Devonian to Ordovician","Medium- to dark-gray, thinly graded bedded to laminated, medium- to fine-grained sandstone; dark-gray to black argillite; intercalated layers, a few tens of meters thick, of dark-gray, generally thinly bedded, locally thick-bedded limestone and dark-gray","Gastropods.  Middle Devonian fossils reported from massive limestone (ls).",null,"HE002",6970,"Healy","Sed",5370,"JCmd"]
["ls (DOs)","Limestone (Sedimentary sequence)","Middle Devonian (to Ordovician)","Approximately 200-m-thick interbed of medium- to light-gray, massive, finely to medium-crystalline, partly  dolomitic limestone (mapped separtely as unit 'ls').  Part of unit DOs.","Middle Devonian fossils reported from massive limestone (ls).",null,"HE002",6971,"Healy","Sed",6931,"DSml"]
["Trbd","Basalt, diabase, and subordinate sedimentary rocks","Late Triassic; Karnian and Norian","Submarine sequence of several hundred, perhaps several thousand meters thick of basalt flows, mostly pillowed, with associated sills and dikes of diabase and gabbro.  Subordinate interbedded sedimentary rocks are dark-gray to dark-grayish-green, fine-gra","haboloid bivalve, radiolaria",null,"HE002",4423,"Healy","Ign",4420,"Trn"]
["TrPas","Flyschlike sedimentary rocks","Late Triassic to Pennsylvanian","Intensely folded marine sequence of at least several hundred meters of dark-gray to black, massive to thin-bedded, flyschlike rocks: conglomerate, sandstone, siltstone, argillite, a few thin interbeds of impure limestone and near top of section, thin int","Abundant trace fossils and displaced bryozoans, echinoderm fragments, rare brachiopods, corals, crinoids, condonts",null,"HE002",5040,"Healy","Sed",5040,"TrPas"]
["Kms","Melange south of McKinley fault","Late and (or) Early Cretaceous","Fault-bounded tectonic and probably sedimentary melange of Paleozoic and upper Mesozoic rocks  Three distinct suites:  1)  Medium- to thin-bedded, greenish-gray to tan-colored, locally black, cherty tuff, chert, argillite, and fine-grained volcanic sands","Radiolaria, conodonts in cherty tuffs (Late? Devonian to Missisppian).  Megafossils and conodonts from limestone (Silurian to Middle Devonian)",null,"HE002",2192,"Healy","Melange",2192,"Kmar"]
["Kmn","Melange north of McKinley fault","Late and (or) Early Cretaceous","Fault-bounded tectonic and probably sedimentary melange of Paleozoic and upper Mesozoic rocks  Four disparate, intricately intermixed  and pervasively sheared rock suites:  1)  Blocks of medium-gray, medium-grained limestone of Silurian(?) to Devonian ag","Radiolaria, Buchia sp. (also see mnl)",null,"HE002",2195,"Healy","Melange",2195,"Kmar"]
["msl (Kms)","Limestone of Melange south of McKinley fault","Late and (or) Early Cretaceous","Lenses and elongate blocks of medium-gray, generally medium-bedded and rarely massive, fine- to medium-grained fossiliferous limestone mapped separately as unit 'msl' but is unit 3 of unit KMs, which is a fault-bounded tectonic and probably sedimentary m","Labechia sp., Favosites sp., Dendrostella? sp., massive stromataporoid, and conodonts (Silurian to Middle Devonian)",null,"HE002",2193,"Healy","Melange",2193,"TrSl"]
["mnl (Kmn)","Limestone of Melange north of McKinley fault","Late and (or) Early Cretaceous","Parts 1 and 2 of unit Kmn, a fault-bounded tectonic and probably sedimentary melange of Paleozoic and upper Mesozoic rocks.  Parts are:  1)  Blocks of medium-gray, medium-grained limestone of Silurian(?) to Devonian age; and 2) Blocks of medium-gray, med","Conodonts, Sagenites?, Tryplasma sp., Lyrielasma? sp., Zelophyllum? sp.,Clavidictyon sp., Ampipora sp., Megalodus sp., Mysidia sp., Belemnite sp. interdeterminate, Cladopora sp., Coenites? sp., coral, molluscs, brachiopods, conodonts, crinoid fragments",null,"HE002",2196,"Healy","Melange",2196,"TrSl"]
["mno (Kmn)","Melange north of McKinley fault","Late and (or) Early Cretaceous","Part 4 of unit Kmn, a fault-bounded tectonic and probably sedimentary melange of Paleozoic and upper Mesozoic rocks  Consists of a poorly exposed small sliver of serpentinized ultramafic rocks, altered basalt, green and maroon tuff, and recrystallized ch",null,null,"HE002",2197,"Healy","Melange",2197,"mlu"]
["Ql","Young and old landslide deposits","Quaternary","Chiefly debris avalanches and large block glides in areas of steep slopes",null,null,"TL002",100,"Talkeetna","Unconsol",100,"Qs"]
["Qau","Alluvium, undivided","Quaternary","Chiefly boulders, gravel, and sand with local areas of silt and clay.  Alluvium on active flood plains, older alluvium on terraces of major streams, alluvial fans, outwash, swamp, marsh, and bog deposits, and alluvial deposits on broad pediment surfaces.",null,null,"TL002",101,"Talkeetna","Unconsol",100,"Qs"]
["Qr","Active and recently active rock glaciers","Quaternary","Chiefly rubble and diamicton",null,null,"TL002",110,"Talkeetna","Unconsol",100,"Qs"]
["Qa","Glacial deposits -- Alaskan glaciation","Quaternary","Chiefly rubble and diamicton.  Includes end and lateral moraines.",null,null,"TL002",111,"Talkeetna","Unconsol",100,"Qs"]
["Qn","Glacial deposits -- Naptowne glaciation","Quaternary","End, lateral, and ground moraine, postglacial alluvial, pond, and swamp deposits, fluvial glacial deposits of all stages of Naptowne glaciation and glaciolacustrine deposits formed during Knik and Naptowne glaciations",null,null,"TL002",120,"Talkeetna","Unconsol",100,"Qs"]
["Qk","Glacial deposits -- Knik glaciation","Quaternary","Well-developed end and lateral moraine, shown only northwest part of quadrangle.",null,null,"TL002",121,"Talkeetna","Unconsol",100,"Qs"]
["Qe","Glacial deposits -- Eklutna glaciation","Quaternary","South of the Alaska Range, lateral and ground moraine have subdued geomorphic expression and include alluvial, swamp, marsh, and bog deposits.  North of the Alaska Range, end and lateral moraines are relatively fresh.",null,null,"TL002",130,"Talkeetna","Unconsol",100,"Qs"]
["Qpe","Glacial deposits -- pre-Eklutna age glaciations","Quaternary","Subdued lateral(?) and ground moraines on north side of Alaska Range, although glacial erratics and well-modified drift on top Yenlo Hills are probably also deposits of this glaciations.",null,null,"TL002",131,"Talkeetna","Unconsol",100,"Qs"]
["Tc","Coal-bearing rocks","Possible Oligocene and Miocene","About 30 m of subituminous coal, with individual beds up to 9 m thick.  Coal-bearing rocks contain interbeds ferruginous siltstone and silty shale.",null,null,"TL002",200,"Talkeetna","Sed",640,"Tcb"]
["Ts","Continental sedimentary rocks","Tertiary, Paleocene","Chiefly medium- to dark-gray phyllitic shale, shale, sandstone, grit, and conglomerate with minor carbonaceous shale and tuffaceous sandstone.","Metasequoia",null,"TL002",201,"Talkeetna","Sed",1920,"Kcs"]
["KJb","Pillow basalt","Early Cretaceous and Jurassic(?)","Dark-greenish-gray elongate bodies of massive-weathering, resistant pillow basalt.  The unit includes interbeds and lenses of mudstone, shale, and siltstone.  The basalt locally includes gabbro which may represent its feeder source.",null,null,"TL002",300,"Talkeetna","Ign",2890,"JTrtv"]
["KJs","Undivided marine sedimentary rocks","Early Cretaceous and Jurassic(?)","Moderate- to deep-water, intertonguing marine sedimentary rocks consisting chiefly of gray to black phyllite, argillite, graywacke, and siltstone which are in part turbidite deposits; lesser amounts of gray, green, and red chert, conglomerate, grit, and","belemnites, Buchia, and occasional Inoceramus of Valanginian to Barremian age)",null,"TL002",302,"Talkeetna","Sed",2852,"KJfn"]
["Pzsl","Shale and limestone","Early Paleozoic?","Marine sedimentary rocks that typically form a thin- to medium-interbedded sequence of black, sooty, carbonaceous, and calcareous shale, dark-gray calcareous siltstone, medium- to dark-gray limestone, and minor gray quartzite.  Shale locally amounts to a",null,null,"TL002",400,"Talkeetna","Sed",4033,"Trcs"]
["Pzsv","Quartzite, semischist, and metavolcanic rocks","early Paleozoic? or possibly late preCambrian","Tan to light-greenish-gray, low-grade (greenschist facies), regionally metamorposed quartzite, quartz semischist, quartz grit, metavolcanic rocks, and minor conglomerate, limestone, phyllite, and quartz-muscovite schist.  Isoclinally folded.",null,null,"TL002",401,"Talkeetna","Meta",9322,"PzZaqs"]
["Tmt","Tonzona pluton","Early Tertiary","Small composite biotite-muscovite granite pluton",null,null,"TL002",210,"Talkeetna","Ign",1320,"Tpgr"]
["TKi","Undivided intrusive rocks -- dikes","Early Tertiary or Late Cretaceous","Intermediate altered porphyry dikes -- most not shown on map as too small",null,null,"TL002",211,"Talkeetna","Ign",1601,"TKd"]
["MzPzg","Gabbro and quartz diorite","Mesozoic and (or) Paleozoic","Dark-green, rust-weathering coarse-grained altered gabbro and minor quartz diorite.",null,null,"TL002",600,"Talkeetna","Ign",5180,"MzPzi"]
["MzPzu","Serpentinite","Mesozoic and (or) Paleozoic","Orange- to light-brown-weathering, light- to dark-green, fault-bounded body of serpentinite and minor talc schist.",null,null,"TL002",601,"Talkeetna","Meta",5290,"MzZum"]
["Tk","Kenai Group, undivided","Pliocene and Miocene","Fluvial sedimentary rocks correlative with estuarine and nonmarine clastic sedimentary Tertiary formations assigned to the Kenai Group.",null,null,"TL002",220,"Talkeetna","Sed",560,"Tk"]
["Tps","Sterling(?) Formation","Pliocene","Orange, light-tan, or light-gray, massive-bedded conglomerate, distinguished from conglomerate in the Tyonek Fm by color, relative coarseness, and clast lithology.  As much as 770 m thick.",null,null,"TL002",221,"Talkeetna","Sed",540,"Tsf"]
["Tts","Tyonek(?) Formation -- Sandstone member","Miocene","Approximately 80 percent sandstone, 20 percent siltstone and claystone, and less than 1 percent conglomerate, coal, and volcanic ash.  Occurs in repetitive cycles 7- to 23-m-thick.",null,null,"TL002",230,"Talkeetna","Sed",600,"Tty"]
["Ttc","Tyonek(?) Formation -- Conglomerate member","Miocene","At least 40 percent conglomerate, 20 percent sandstone, and less than 40 percent siltstone, claystone, and coal.  Conglomerate is light-brown, light-gray, or bluish-gray and poorly indurated.  Sandstone is coarse, poorly sorted and pebbly, and very poorl",null,null,"TL002",231,"Talkeetna","Sed",600,"Tty"]
["Tvs","Undivided volcanic and sedimentary rocks","Tertiary","Interbedded tuff, mafic volcanic flows, sandstone, shale, and minor calcareous mudstone.  Volcanic rocks are chiefly medium- to coarse-grained greenish-gray crystal lithic lapilli tuff and volcanic rubble flows in units as much as 150 m thick.",null,null,"TL002",240,"Talkeetna","Ign",1000,"Tvu"]
["KJs","Undivided marine sedimentary rocks","Cretaceous and Early Jurassic","Medium- to dark-gray, generally isoclinally folded, thick sequence of lithic graywacke, phyllite, and shale with local lenses of quartz-chert conglomerate.  Minor fossiliferous limestone, radiolarian chert, and red ferruginous sandstone and siltstone.  [","Inoceramus, ammonites, brachiopods, and pelecypods",null,"TL002",301,"Talkeetna","Sed",2850,"KJf"]
["Pzbs","Pillow basalt","middle or late Paleozoic","Chiefly dark-greenish-gray massive pillow basalt and petrographically similar coarse-grained pyroxene gabbro and basaltic dikes and sills.  as mapped, includes varying amounts of interstratified agglomerate, flow breccia, aquagene tuff, and thick, chaoti",null,null,"TL002",410,"Talkeetna","Ign",5450,"JTrtv"]
["Pzv","Volcanic and sedimentary rocks","middle or late Paleozoic","Dark-greenish-gray massive-weathering mafic volcanic rocks that include pillow basalt, breccia, agglomerate, tuff, and massive basalt flows.  Volcanic rocks commonly contain interbeds of black phyllite, chert-pebble conglomerate, light-green tuff, and gr",null,null,"TL002",411,"Talkeetna","Ign",5410,"Pzvs"]
["Pad","Conglomerate of Mount Dall","Middle Pennsylvanian","Dark-brown to yellowish-brown-weathering sequence of conglomerate, sandstone, siltstone, and shale mainly of continental origin that forms a broad, open, east-plunging syncline.  Unit is chiefly massive lenticular beds of conglomerate and sandstone with","Limestone clasts in conglomerate contain Middle Devonian(?) fossils.  Shale and sandstone beds locally contain abundant plant fossils of Middle Pennsylvanian age.",null,"TL002",420,"Talkeetna","Sed",6010,"PDsc"]
["Pzus","Undivided sedimentary rocks","Mississippian, Pennsylvanian, and (or) Devonian","A depositionally and structurally complex terrane of chiefly marine flysoid sedimentary rocks which include: 1) trench assemblages characterized by terriginous turbidites, cherty pelagites, and basaltic pillow lavas; 2) slope and shelf assemblages that i","Fossils of varying late Paleozoic ages",null,"TL002",421,"Talkeetna","Sed",5370,"JCmd"]
["Dl","Limestone","Middle and Late Devonian","Thin-bedded gray micrites grading upward into fossiliferous, massive to reefoid, biostromal beds of colonial rugose corals and massive stromatoporoids.","Conodonts of Late Devonian; abundant coral and shelly faunas of late Middle and early Late Devonian; locally late Early or Middle Devonian",null,"TL002",500,"Talkeetna","Sed",6615,"DSmdl"]
["Pzp","Phyllite","Paleozoic","Dark-gray phyllite, phyllitic shale, and argillaceous siltstone.",null,null,"TL002",430,"Talkeetna","Meta",5370,"JCmd"]
["Sl","Limestone","Silurian","Light-gray to light-brown massive-weathering marbleized limestone and local areas of thin-bedded to laminated limestone.","Graptolites, dasycladacean algae, corals",null,"TL002",700,"Talkeetna","Sed",6615,"DSmdl"]
["Oc","Chert and shale","Early to Middle Ordovician","Chaotically folded allochthonous sequence of interbedded graptolitic shale and chert and minor sandstone and siltstone.","Graptolites",null,"TL002",800,"Talkeetna","Sed",7580,"SCpl"]
["Pzd","Sedimentary rocks of Dillinger River (limey)","Paleozoic","Thick sequence of sedimentary rocks consisting of an undetermined thickness of interbedded lime mudstone and shale, more than 900 m of apparently unfossiliferous deep-water, well-bedded lime mudstone (micrites), and at least 900 m of interbeeded sandston","Cardiolacea of late Wenlockian (Silurian) age, conodonts of Silurian age.",null,"TL002",431,"Talkeetna","Sed",5310,"DCd"]
["Tf","Foraker pluton","Eocene","Medium-grained, equigranular biotite and hornblende granodiorite.",null,"K-Ar? of 38 MA","TL002",241,"Talkeetna","Ign",1292,"Toem"]
["Tm","McKinley Sequence -- McKinley pluton","Early Tertiary","Medium- to coarse-grained, hypidiomorphic-granular biotite granite.",null,null,"TL002",250,"Talkeetna","Ign",1320,"Tpgr"]
["Tmc","McKinley Sequence -- Cathedral pluton","Early Tertiary","Medium- to coarse-grained, hypidiomorphic-granular biotite and biotite-muscovite granite and minor phases of biotite-hornblende granodiorite.",null,null,"TL002",251,"Talkeetna","Ign",1320,"Tpgr"]
["Tmk","McKinley Sequence -- Kahiltna pluton","Early Tertiary","Two bodies, southwest is fine- to coarse-grained, hypidiomorphic-granular biotite and biotite-muscovite granite and granodiorite.  Northeast body is medium- to coarse-grained, hypidiomorphic-granular biotite-muscovite granite.",null,null,"TL002",260,"Talkeetna","Ign",1320,"Tpgr"]
["Tmr","McKinley Sequence -- Ruth pluton","Early Tertiary","Three bodies, Chulitna body is medium- to coarse-grained, weakly foliated, hypidiomorphic-granular biotite granite.  South body is coarse-grained, hypidiomorphic-granular biotite granite and granodiorite.  North body is medium- to coarse-grained, hypidio",null,null,"TL002",261,"Talkeetna","Ign",1320,"Tpgr"]
["Te","Granodiorite of Mount Estelle","Early Tertiary","Medium-grained, hypidiomorphic-granular biotite-hornblende granodiorite.  Tourmaline is a characteristic accessory mineral.",null,"K-Ar ages on hornblende of 65 and 66 Ma","TL002",270,"Talkeetna","Ign",1350,"Thgd"]
["Tcp","Composite plutons","Early Tertiary","Average composition is quartz monzonite but ranges from peridotite to granite.",null,"K-Ar ages range from 64.6 and 67.4 Ma","TL002",271,"Talkeetna","Ign",1320,"Tpgr"]
["TKi","Unidivided intrusive rocks","Late Cretaceous or Tertiary","Probably range in composition from granite to tonalite",null,null,"TL002",211,"Talkeetna","Ign",1650,"TKi"]
["MzPzi","Unidivided intrusive rocks","Mesozoic or Paleozoic","Dark-gray to greenish-gray dikes and sills ranging in composition from basalt to granodiorite.",null,null,"TL002",610,"Talkeetna","Ign",5160,"MzPzi"]
["MzPzd","Undivided dunite and serpentinite","Mesozoic or Paleozoic","Alpine-type ultramafic rocks and minor talc schist.  Chromite-bearing dunite in sills.",null,null,"TL002",611,"Talkeetna","Ign",5190,"MzZum"]
["JTrsv","Chulitna sequence -- Sedimentary and volcanic rocks","Jurassic to late Triassic","Massive cliff-forming outcrops of argillite, radiolarian chert, siltstone, minor pillow basalt, and impure micritic limestone.",null,null,"TL002",900,"Talkeetna","Sed",3850,"JTrct"]
["JTrvs","Chulitna sequence -- Volcanic and sedimentary rocks","Early Jurassic to late Paleozoic","Distinctive light-green to maroon volcaniclastic rocks that range from tuffaceous shale to a quartz-pebble conglomerate having a tuffaceous matrix.  Commonly contain interbeds of massive micritic and bioclastic limestone, minor chert, argillite, rust-wea","Thecosmilia, Heterastridium, and Septocardia(?) of Late Triassic (Norian) age",null,"TL002",281,"Talkeetna","Ign",4235,"JTrct"]
["Trlb","Chulitna sequence -- Limestone and basalt","Early Jurassic to late Paleozoic","Limestone and basalt which grades southwestward into interbedded gray limestone, dark-green pillow basalt, massive and locally semischistose basaltic tuff, calcareous sandstone, and minor black chert and silty limestone.","Monotis subcircularis, Heterastridium, and Cassianella of Late Triassic (Norian) age",null,"TL002",290,"Talkeetna","Sed",4021,"Trlb"]
["Qa","Alluvial deposits","Holocene","Chiefly unconsolidated sand and gravel.  Flood-plains, fans, and cones.  Oldest deposits may be outwash.",null,null,"MH002",100,"Mount Hayes","Unconsol",100,"Qs"]
["Qfl","Fluviolacustrine deposits","Holocene","Chiefly consisting of sand, silt, and clay.  Lake, pond, and low-gradient streem deposits.",null,null,"MH002",112,"Mount Hayes","Unconsol",100,"Qs"]
["Qc","Colluvial deposits","Holocene","Chiefly rubble, gravel, sand, silt, and clay.  Talus and other slope debris deposits, also includes alluvium of minor streams, and locally glacial, rock glacier, and mass-wasting deposits.  May include older glacial drift and locally grades into glacial",null,null,"MH002",107,"Mount Hayes","Unconsol",100,"Qs"]
["Qam","End and lateral moraines of Alaskan glaciation","Holocene","Chiefly rubble and diamicton",null,null,"MH002",130,"Mount Hayes","Unconsol",100,"Qs"]
["Qwm","End and lateral moraines of Wisconsin glaciation","Holocene and Pleistocene","Poorly sorted and unstratified till of unconsolidated sand and gravel.  Chiefly rubble and diamicton, local sand and gravel.",null,null,"MH002",135,"Mount Hayes","Unconsol",100,"Qs"]
["Qwf","Glaciofluvial deposits of Wisconsin glaciation","Holocene and Pleistocene","Moderately well-stratified layers and lenses of well-rounded gravel with a matrix of silt and sand.  Poorly to moderately well sorted with lenses of well-sorted sand locally.",null,null,"MH002",140,"Mount Hayes","Unconsol",100,"Qs"]
["Qog","Drift of older glaciations","Pleistocene","Glacial deposits of subdued geomorphic expression, probably of early Wisconsin or Illinoian age occurring beyond limit of Wisconsin moraines.  At higher elevations, chiefly unconsolidated diamicton and boulder deposits.  At lower elevations, consist chie",null,null,"MH002",190,"Mount Hayes","Unconsol",100,"Qs"]
["Tn","Nenana Gravel","Pliocene","Consists chiefly of poorly cemented conglomerate but includes some sandstone and siltstone.  Clast composition in the MH D-6 quadrangle is (in decreasing order of abundance) schist, quartzite, granitic rocks, gabbro, and metagabbro.  Top of unit is erode",null,null,"MH002",570,"Mount Hayes","Sed",570,"Tn"]
["Ts","Sandstone","Pliocene, Miocene, and Oligocene","Chiefly brown sandstone and graywacke but includes some interbedded conglomerate and dark argillite.  Generally fault bounded.  Sandstone is fine- to medium-grained, poorly sorted, and contains angular grains.  Composition varies from quartz grains in a","Plants of Oligocene, Miocene, and Pliocene age",null,"MH002",500,"Mount Hayes","Sed",500,"Tsu"]
["Tsj","Sedimentary rocks of Jarvis Creek coal field -- undivided","Early Tertiary","Chiefly sandstone, mudstone, conglomerate, and coal.  (Unit of Wahraftig and Hickcox, 1955.)","Teriary plant fossils",null,"MH002",910,"Mount Hayes","Sed",910,"Tjc"]
["Tsju","Sedimentary rocks of Jarvis Creek coal field -- Upper member","Early Tertiary","Chiefly dark-gray mudstone and sandstone containing scattered coal beds.  Maximum estimated thickness is 300 m.","Teriary plant fossils",null,"MH002",911,"Mount Hayes","Sed",910,"Tjc"]
["Tsjm","Sedimentary rocks of Jarvis Creek coal field -- Middle member","Early Tertiary","Chiefly buff arkosic sandstone containing claystone and scattered coal beds and a prominent coal and shale zone at base.  Maximum estimated thickness is 300 m.","Teriary plant fossils",null,"MH002",912,"Mount Hayes","Sed",910,"Tjc"]
["Tsjl","Sedimentary rocks of Jarvis Creek coal field -- Lower member","Early Tertiary","Chiefly angular quartz sandstone and conglomerate; some claystone and coal.  Maximum estimated thickness is 150 m.","Teriary plant fossils",null,"MH002",913,"Mount Hayes","Sed",910,"Tjc"]
["la","Lamprophyre, alkali gabbro, and alkalic diorite","Early Tertiary and Late Cretaceous","Undifferentiated dikes, sills, and small plutons.  Predominantly fine- to medium-grained, panidiomorphic granular to porphyritic texture.",null,"Two clusters of K-Ar ages in the east-central part of quad.  62.9 to 69.2 Ma in the Robertson River area and 69.3 to 107.6 Ma in the Tok River area","MH002",1690,"Mount Hayes","Ign",1690,"TKl"]
["md","Monzonite and diorite","Early Tertiary and Late Cretaceous","Monzonite and diorite, includes lesser quartz monzonite and quartz diorite.  Undifferentiated dikes, sills, and small plutons.  Fine- to medium-grained, hypautomorphic granular and locally porphyritic",null,null,"MH002",1661,"Mount Hayes","Ign",1660,"TKm"]
["grn1","Granitic unit 1","Early Tertiary and (or) Late Cretaceous","Granite dikes, stocks, and small plutons.  Locally schistose.  Fine- to coarse-grained, hypautomorphic granular and locally porphyritc.",null,null,"MH002",1655,"Mount Hayes","Ign",1655,"TKg"]
["grn2","Granitic unit 2","Early Tertiary and (or) Late Cretaceous","Granodiorite dikes, stocks, and small plutons.  Locally schistose.  Fine- to coarse-grained, hypautomorphic granular and locally porphyritc.",null,null,"MH002",1660,"Mount Hayes","Ign",1660,"TKm"]
["grn3","Granitic unit 3","Early Tertiary and (or) Late Cretaceous","Quartz diorite and diorite dikes, stocks, and small plutons.  Locally schistose.  Fine- to coarse-grained, hypautomorphic granular and locally porphyritc.",null,null,"MH002",1665,"Mount Hayes","Ign",1665,"TKqd"]
["grgr","Granite of Gerstle River","Early Tertiary","Chiefly biotite granite, include minor quartz diorite.  Fine- to medium-grained, hypautomorphic granular and locally porphyritc.",null,"K-Ar ages of 53.4 and 54.3 Ma","MH002",1332,"Mount Hayes","Ign",1320,"Tpgr"]
["grbc","Granite of Buchanan Creek","Early Tertiary or Late Cretaceous","Chiefly biotite-hornblende granite, with lesser granodiorite and quartz diorite.  Fine- to medium-grained, hypautomorphic granular and locally porphyritc.",null,null,"MH002",1656,"Mount Hayes","Ign",1655,"TKg"]
["grmh","Granite of Mount Hayes","Early Tertiary or Late Cretaceous","Chiefly biotite granite, with fine- to medium-grained, hypautomorphic granular texture.",null,null,"MH002",1657,"Mount Hayes","Ign",1655,"TKg"]
["grmr","Granodiorite of Molybdenum Ridge","Late Cretaceous","Chiefly biotite-hornblende granodiorite, with lesser granite and quartz diorite.  Medium-grained, hypautomorphic granular texture, locally porphyritic.",null,"K-Ar biotite and hornblende dates and U-Pb zircon ages ranging from 84 to 93 Ma","MH002",2480,"Mount Hayes","Ign",2480,"Kg"]
["grgm","Granite of Granite Mountain","Late Cretaceous","Chiefly biotite-hornblende granite, includes minor quartz diorite.  Fine- to medium-grained, hypautomorphic granular texture.",null,"U-Pb zircon age of 90 Ma","MH002",2461,"Mount Hayes","Ign",2475,"Kg"]
["grma","Granite of Macomb Plateau","Late Cretaceous","Chiefly hornblende granite, biotite granite, hornblende-biotite granite, hornblende granodiorite, and minor quartz diorite.  Very fine- to medium-grained, hypautomorphic granular texture, locally porphyritic.",null,"Pb-alpha ages of 90  and 110 Ma (Highly suspect)","MH002",2462,"Mount Hayes","Ign",2475,"Kg"]
["grrc","Granite of Rumble Creek","Late Cretaceous","Chiefly biotite-hornblende granite and granodiorite.  Fine- to medium-grained, hypautomorphic granular texture, locally porphyritic.",null,"K-AR hornblende age of 89 Ma","MH002",2463,"Mount Hayes","Ign",2475,"Kg"]
["mgb","Gabbro, diorite, metagabbro, metadiorite, metadiabase, and amphibolite","Cretaceous","Chiefly hornblende metagabbro, metadiabase, and minor amphibolite.  Undifferentiated dikes, sills, and small plutons.  Metagabbro and metadiabase generally fine- to medium-grained with hypautomorphic granular to diabasic texture, locally porphyritic.  Am",null,null,"MH002",2670,"Mount Hayes","Meta",2670,"Kmum"]
["gbm","Gabbro of Mount Moffit","Cretaceous?","Gabbro of fine- to medium-grained with hypautomorphic granular to diabasic texture.  Correlative with unit mgb.",null,null,"MH002",2440,"Mount Hayes","Ign",2440,"Kmum"]
["lga","Augen gneiss and schist","Mississippian (intrusion age)","Chiefly medium-grained, mylonitic gneiss.  Intensely deformed, exhibiting a strong schistosity showing gentle north or south dips.  Contains diagnostic amphibolite facies minerals and shows retrogression to greenschist facies.",null,"Intrusion from U-Pb zircon age of 333 to 345 Ma from Big Delta quadrangle to north and metamorphism from Rb-Sr ages on multiple phases of 110 Ma","MH002",6520,"Mount Hayes","Meta",6521,"MDyao"]
["lgr","Medium-grained gneissose granitic rocks","Devonian (intrusion age)","Chiefly metagranite but includes some metamorphosed quartz diorite and meta granodiorite.  Relict hypautomorphic granular texture.  Intensely deformed, exhibiting a strong schistosity.  Contains diagnostic amphibolite facies minerals and locally shows re",null,"Intrusion from U-Pb zircon age of 360 Ma and metamorphism from Rb-Sr isochron at 110 Ma","MH002",7252,"Mount Hayes","Meta",7250,"MDyao"]
["lgs","Pelitic schist and quartzite","Devonian and older","Chiefly fine- to medium-grained, poly-deformed, mylonitic pelitic schist and minor quartzite and calc-schist.  Unit intensely deformed, exhibiting a strong schistosity that dips gently north or south.  Metamorphised to middle to upper amphibolite facies",null,"U-Pb zircon age from qtz-bio-feld schist in Big Delta quadrangle to north was 365 Ma.","MH002",7403,"Mount Hayes","Meta",8630,"PzZysa"]
["mg","Medium-grained granitic gneiss","Devonian (intrusion age)","Chiefly fine- to medium-grained mylonitic gneiss derived from granite, granodiorite, and quartz diorite.  Includes minor augen gneiss.  Texture varies from protomylonitic to mylonitic schist.  Intensely deformed exhibiting strong schistosity.  Schistosit",null,"U-Pb zircon ages about 372 Ma indicate intrusion, Rb-Sr mineral isochron indicates metamorphism at 102 Ma","MH002",7250,"Mount Hayes","Meta",7250,"MDyao"]
["ms","Metamorphosed pelitic, calcareous, and quartz-feldspar sedimentary rocks","Devonian or older","Chiefly fine-grained, mylonitic, metasedimentary schists.  Quartz-mica schist and lesser calc-schist.  Intensely deformed exhibiting strong schistosity.  Schistosity and parallel composition layering dip moderately southwest and strike northwest.  Metamo",null,null,"MH002",7400,"Mount Hayes","Meta",9322,"PzZaqs"]
["jcg","Fine- to medium-grained gneissose granitic rocks","Devonian (intrusion)","Chiefly schistose metagranodiorite, and augen gneiss.  Intensely deformed exhibiting strong schistosity.",null,"Intrusion age from U-Pb zircon determination of 372 Ma","MH002",7251,"Mount Hayes","Meta",7250,"MDyao"]
["jcv","Fine-grained schistose metavolcanic rocks and metasedimentary rocks","Devonian (eruption)","Chiefly fine-grained, mylonitic, metavolcanic rocks interlayered with lesser metasedimentary rocks.  Metavolcanic rocks consist chiefly of metamorphosed quartz keratophyre, dacite, and andesite and lesser metarhyodacite and metabasalt derived from fine-g",null,"U-Pb zircon age determinations on metavolcanic rocks yielded ages of 364, 372, and about 375 Ma","MH002",7241,"Mount Hayes","Meta",7320,"Pzsc"]
["jcs","Fine-grained metasedimentary rocks","Devonian and older","Chiefly fine-grained, mylonitic, metasedimentary rocks.  Rocks consist of 65 percent quartz-mica schist, 15 percent quartzite, and 5 percent each of chlorite-wihite mica schist, quartz-biotite schist, calc-schist, and marble.  Metamorphism ranges from lo",null,"K-Ar ages on white mica range from 106 to 118 Ma, thought to be metamorphic age rather than cooling age (?)","MH002",7401,"Mount Hayes","Meta",9322,"PzZaqs"]
["hgv","Fine-grained schistose volcanic rocks and phyllite","Devonian (extrusion)","Chiefly fine-grained, metavolcanic and metasedimentary phyllonites and blastomylonites.  Metavolcanic rocks chiefly metamorphosed quartz keratophyre and andesite and sparse dacite and basalt.  Metasedimentary rocks chiefly quartz-mica phyllonite, quartzi",null,"U-Pb zircon yield ages of 375 Ma","MH002",7240,"Mount Hayes","Meta",7240,"Dyv"]
["hgs","Fine-grained schistose sedimentary rocks and volcanic rocks","Devonian and older","Chiefly fine-grained, pale-yellow, pale-green, and graphitic black metasedimentary phyllonite and blastomylonite with minor metavolcanic blastomylonite.   Predominant lithologies are quartz-mica phyllonite, quartz-calc phyllonite, quartzite, marble, and",null,null,"MH002",7402,"Mount Hayes","Meta",7402,"Dys"]
["ag","Metamorphosed granitic rocks","Late to middle Cretaceous","Consists chiefly of metamorphosed stocks, dikes, and sills of diorite and minor quartz diorite, granite, granodiorite, and gabbro.  Fine- to medium-grained, having relict hypautomorphic granular texture.  Unit moderately deformed and exhibits moderate sc",null,"U-Pb zircon age of 71 Ma.  In adjacent Healy quadrangle, Ar-Ar analysis of hornblende yielded 106 Ma.  K-Ar ages on biotite range from 18.2 to 27 Ma and hornblende 36.8 Ma","MH002",2600,"Mount Hayes","Sed",2600,"Kmi"]
["as","Metamorphosed sedimentary rocks","Triassic to Silurian","Chiefly of fine- to medium-grained, mylonitic, calc-schist, marble, quartz-mica schist, and quartzite.  Protoliths thought to be marl, limestone, pelite, and sandstone.  Unit intensely ductily deformed and schistosity dips steeply to vertically and strik","Conodont fragments of post-Ordivician age",null,"MH002",5201,"Mount Hayes","Meta",5201,"Trcs"]
["wm","Melange","Cretaceous, Devonian, and Silurian","Structural melage consisting of two assemblages:  1) Cretaceous flysch and volcanic rocks consisting mainly of argillite, and weakly metamorphosed quartz silitstone, quartz sandstone, graywacke, and conglomerate and minor andesite and acite and 2) Small","Cretaceous ammonite in unit 1 and Silurian(?) and Devonian mega- and micro-fossils.",null,"MH002",2195,"Mount Hayes","Melange",2195,"Kmar"]
["Tsc","Sandstone and conglomerate","Miocene to Eocene","Chiefly continental clastic deposits of light-colored, fine-grained, poorly sorted sandstone and having locally interbedded siltstone, pebbly sandstone, pebble to cobble conglomerate, and sparse thin coal layers.  In vicinity of \"The Hoodoos\", contains v","Plants and pollen of late Eocene to Pliocene age","K-Ar ages of hornblende from included ash were 5.5  and 31.1 Ma","MH002",510,"Mount Hayes","Sed",500,"Tsu"]
["Tc","Conglomerate","Eocene","Chiefly continental clastic deposits of poorly sorted, crudely bedded to massive, polymictic conglomerate and lesser sandstone. Contains clasts of rhyodacite to dacite tuff, the Nikolai Greenstone, argillite, volcanic sandstone, andesitic to dacitic rock",null,null,"MH002",840,"Mount Hayes","Sed",500,"Tsu"]
["Tv","Volcanic rocks","Eocene","Chiefly vitric-lithic-crystal ash-flow tuff, breccia, agglomerate, flows, dikes, and sills, and minor volcanic sandstone, conglomerate, and fossiliferous limestone.","?","K-Ar whole-rock age on tuff was 49 Ma","MH002",1100,"Mount Hayes","Ign",1140,"Tcv"]
["grs1","Granitic unit 1","Cretaceous and Late Jurassic","Chiefly granitic and minor monzonite and diorite dikes, stocks, and small plutons.  Fine- to medium-grained, hyautomorphic granular texture.  Locally metamorphosed to lower greenschist facies.",null,null,"MH002",2900,"Mount Hayes","Ign",2900,"KJg"]
["grs2","Granitic unit 2","Cretaceous and Late Jurassic","Chiefly hornblende-biotite granodiorite and hornblende granodiorite and minor granodiorite and granite dikes, stocks, and small plutons.  Includes sparse syenodiorite and quartz diorite.  Fine- to medium-grained, hyautomorphic granular texture.  Locally",null,null,"MH002",2905,"Mount Hayes","Ign",2900,"KJg"]
["grs3","Granitic unit 3","Cretaceous and Late Jurassic","Quartz diorite and diorite dikes, stocks, and small plutons.  Includes sparse syenodiorite and quartz diorite.  Fine- to medium-grained, hyautomorphic granular texture.  Locally metamorphosed to lower greenschist facies.",null,null,"MH002",2910,"Mount Hayes","Ign",2900,"KJg"]
["grsg","Granite of Susitna Glacier","Early Tertiary","Chiefly biotite-white mica granite.  Fine- to medium-grained, hyautomorphic granular texture.",null,"Three K-Ar hornblende and biotite ages of 35.5 to 36.1 Ma","MH002",1276,"Mount Hayes","Ign",1290,"Toegr"]
["grcl","Granite porphyry of Caribou Lake","Early Cretaceous and (or) Late Jurassic?","Chiefly biotite granite porphyry.  Fine-grained; locally medium-grained.  Local hyautomorphic granular texture.  Local extensive hydrothermal alteration.",null,null,"MH002",2901,"Mount Hayes","Ign",2900,"KJg"]
["grrm","Granodiorite of Rainbow Mountain","Early Cretaceous and (or) Mississippian","Chiefly biotite granite porphyry.  Fine-grained; locally medium-grained.  Local hyautomorphic granular texture.  Local extensive hydrothermal alteration.",null,"A possible Late Mississippian age from K-Ar hornblende analysis 326 Ma.","MH002",5170,"Mount Hayes","Ign",5170,"MzPzg"]
["um","Ultramafic and associated rocks","Mesozoic?","Chiefly variably serpentinized pyroxenite, peridotite, dunite, schistose amphibolite, serpentinite, and hornblende-plagioclase gneiss derived from gabbro.  Locally intruded by gabbro dikes, tonalite, and granite.  Intensely deformed and fault-bounded.",null,"K-Ar ages on hornblende and biotite of 123 and 126 Ma","MH002",4890,"Mount Hayes","Ign",4890,"Mzum"]
["gg","Gneissose granitic rocks","Early Tertiary and Late Cretaceous","Chiefly gneissose granodiorite and quartz diorite and minor granite.  Fine- to medium-grained, with relict hypautomorphic granular, seriate, and porphyritic textures.  Locally grades to migmatite.  Unit metamorphosed at middle to upper amphibolite facies",null,"U-Pb zircon and sphene and K-Ar mica and hornblende ages range between 29.2 to 70 Ma.","MH002",1720,"Mount Hayes","Meta",1720,"TKgg"]
["sa","Schist and amphibolite","Late Cretaceous or older","Chiefly garnet-biotite-plgioclase schist and hornblende amphibolite.  Relatively older, more mafic, and more highly metamorphosed variation of gneissose granitic rocks (unit gg) which locally intrude this unit.  Intensely regionally metamorphosed and pen",null,null,"MH002",5205,"Mount Hayes","Meta",5205,"Mzsa"]
["mig","Migmatite","Cretaceous?","Transitional rock unit between mimatitic schist (unit mgsh) and gneissos granitic rocks (unit gg).  Grades from gneissose granitic rocks, containing fragments of nearly completely assimilated schist and amphibolite, to highly contorted schist and amphibo",null,null,"MH002",2631,"Mount Hayes","Meta",2630,"Mzsa"]
["mgsh","Migmatitic schist","Cretaceous?","Grades from schist and amphibolite (unit sa) containing diffuse granitic dikes concordant to schistosity, to contorted and partly assimilated schist and amphibolite.",null,"K-Ar ages range from 31.9 to 65.9 Ma, hornblende ranging from 58.5 to 65.9 Ma and biotite from 31.9 to 56.9 Ma.","MH002",2630,"Mount Hayes","Meta",2630,"Mzsa"]
["sq","Schist, quartzite, and amphibolite","Triassic?","Unit of relatively older calc-silicate schist, quartzite, and amphibolite.  Moderately to intensely deformed with a moderate schistosity.  Fine- to medium-grained.  Evidence suggests calc-silicate schist and amphibolite developed from marl.","Lithologically similar rocks in Healy quadrangle to west contain Pennsylvanian to Triassic conodonts and fragments of late Triassic bivalves.",null,"MH002",5207,"Mount Hayes","Meta",5207,"Trcs"]
["msh","Quartz-mica schist, calc-schist, and amphibolite","Late Jurassic or older","Chiefly quartz-mica schist, amphibolite, and calc-schist.  Protoliths chiefly pelite, sandstone, graywacke, and minor marl, andesite, and gabbro.  Intensely deformed, with a strong schistosity.  Metamorphosed to amphibolite facies.",null,"K-Ar analyses of biotite and muscovite range from 30.6 to 48.0 Ma, Single hornblende yielded age of 69.6 Ma.","MH002",5206,"Mount Hayes","Meta",5206,"Mzpca"]
["mph","Phyllite","Late Jurassic or older","Chiefly fine-grained white mica-quartz phyllite, and minor quartz-plagioclase-white mica phyllite, clinozoisite-chlorite-quartz phyllite, calcite-chlorite phyllite, and quartz-rich marble and metaandesite.  Protoliths chiefly siltstone, metavolcanic silt",null,null,"MH002",5215,"Mount Hayes","Meta",5215,"Mzpca"]
["ma","Argillite and metagraywacke","Late Jurassic or older","Chiefly argillite, metagraywacke, and metaandesite locally.  Protoliths of siltstone, calcareous mudstone, and volcanic graywacke.  Unit strongly schistose.  Metamorphosed to lower greenschist facies.",null,null,"MH002",5210,"Mount Hayes","Meta",5210,"Mzpca"]
["csv","Schistose metasedimentary and metavolcanic rocks.","Late Triassic","Chiefly fine-grained quartz-white mica-schist, chlorite-calcite-quartz schist, marble, greenstone, and sparse metadacite.  Protoliths of quartz-siltstone, calcareous silty sandstone, limestone, fine-grained basalt, and fine-grained dacite.  Unit exhibits","Correlative rocks in southeast Healy quadrangle contain Heterastridium sp. of Late Triassic age.",null,"MH002",4410,"Mount Hayes","Meta",4410,"Trnm"]
["umm","Ultramafic and mafic igneous rocks occurring along Broxson Gulch thrust","Cretaceous to Triassic?","Chiefly dunite, olivine-clinopyroxene cumulates, serpentinite, metagabbro, and metadiabase.  Unit occurs in scattered fault bounded exposures.  Local, low-grade metamorphism.",null,"K-Ar ages on hornblende in gabbro dikes of 91.9 and 97.7 Ma","MH002",4891,"Mount Hayes","Ign",4891,"Mzum"]
["JTrm","McCarthy Formation","Early Jurassic and Late Triassic","Chiefly rhythmically, thin- to medium-bedded, calcareous argillite and impure limestone, mainly spiculitic, skeletal, or intraclastic lime packstone.  Estimated maximum thickness of a few hundred meters.","Monotis M. subcircularia(?) of Late Triassic age",null,"MH002",3820,"Mount Hayes","Sed",3820,"JTrmc"]
["ga","Gabbro, diabase, and metagabbro","Late Triassic?","Chiefly hornblende gabbro, clinopyroxene gabbro, and hornblende-clinopyroxene gabbro and sparse quartz gabbro and hornblende quartz diorite.  Dark-gray, fine- to medium-grained, and mainly relict hypautomorphic granular texture, but locally porphyritic,",null,null,"MH002",4320,"Mount Hayes","Ign",4320,"Trgb"]
["cu","Cumulate mafic and ultramafic rocks","Late Triassic?","Chiefly consists of 1) fault-bounded lenses of olivine-cumulate and olivine-pyroxene cumulate in Slana River subterrane, and 2) large sills of olivine cumulate, olivine-pyroxene cumulate, and pyroxene-plagioclase cumulate in Tangle subterrane.  Include F",null,null,"MH002",4321,"Mount Hayes","Ign",4321,"Trgb"]
["KJs","Marine metasedimentary rocks","Early Cretaceous and Late Jurassic","Principally deep-marine turbidite deposits consisting of graded beds of metamorphosed dark-gray to gray argillite, siltstone, and graywacke, pebbly graywacke, pebble to cobble conglomerate, and sparse andesite.  Graded beds well-developed locally; consis","Late Jurassic megafossils, locally abundant Buchia in Nabesna quadrangle.",null,"MH002",2970,"Mount Hayes","Meta",2970,"KJfm"]
["Trl","Limestone","Late Triassic","Chiefly dark- to light-gray micrite, dismicrite, or microsparite.  Conformably overlies Nikolai Greenstone (unit Trn).  Fine- to medium-grained, medium- to massive-bedded containing lenses and nodules of gray and black chert and irregular patchworks of d","Locally contains moderately abundant Late Triassic mega- and microfossils.",null,"MH002",4030,"Mount Hayes","Sed",4030,"JTrlm"]
["Trn","Nikolai Greenstone","Late Triassic","Chiefly massive dark-gray-green, dark-gray-brown, reddish-brown, and maroon-gray subaerial, amygdaloidal basalt flows, separated locally by thin beds of reddish-brown nonmarine volcaniclastic rocks.  Unit pervasively metamorphosed to lower greenschist fa",null,null,"MH002",4420,"Mount Hayes","Meta",4420,"Trn"]
["Pe","Eagle Creek Formation","Early Permian","Chiefly conformable sequence of alternating marine argillite and limestone.  Divided into either an upper argillite and lower limestone unit in south central part of Mount Hayes quadrangle or two limestone and two argillite units in the eastern part of t","Abundant mega- and microfossils, mainly brachiopods, corals, and foraminifers, indicated an Early Permian age",null,"MH002",5950,"Mount Hayes","Meta",5950,"Pe"]
["Pi","Shallow-level intrusive stocks, dikes, sills, and small plutons.","Early Permian?","Sparse to locally abundant andesite, and lesser dacite and rhyolite, stocks, sills, and dikes that intrude Slana Spur Formation and Tetelna Volcanics.  Granoblastic overprint metamorphic texture with local weak schistosity.  Metamorphosed to lower greens",null,null,"MH002",5860,"Mount Hayes","Ign",5860,"Pmi"]
["PaPs","Slana Spur Formation","Early Permian to Middle Pennsylvanian","Chiefly a thick sequence of marine calcareous and noncalcareous volcaniclastic rocks and lesser limestone, tuff, and volcanic breccia.  Disconformably overlies Tetelna Volcanics.  Correlative with volcaniclastic member of Station Creek Formation of Skola","Megafossils and microfossils, mainly brachiopods, corals, and foraminifers, range from Middle Pennsylvanian through Early Permian.","K-Ar age on hornblende from a weakly metamorphosed mafic nodule was 94.4 Ma, possible age of low-grade regional metamorphism of Wrangellia terrane.","MH002",5620,"Mount Hayes","Meta",5620,"Pat"]
["PaPsu","Slana Spur Formation -- Calcareous volcaniclastic rocks member","Early Permian to Middle Pennsylvanian","Predominantly gray-green, clastic, locally fossiliferous limestone and marble, and gray-green coarse-grained calcareous volcanic sandstone.  Includes minor volcanic conglomerate, light-gray-green lailli tuff, and andesite.  Metamorphosed to lower greensc",null,null,"MH002",5621,"Mount Hayes","Meta",5621,"Pat"]
["PaPsl","Slana Spur Formation -- Volcaniclastic rocks member","Early Permian to Middle Pennsylvanian","Dark-gray, dark-green, and maroon volcanic and volcaniclastic rocks.  Chiefly volcanic flows interbedded with lapilli tuff, volcanic breccia, graywacke, argillite, and limestone to marble.  Local massive to bedded conglomerate, graywacke, and siltstone.",null,null,"MH002",5631,"Mount Hayes","Meta",5630,"PPasc"]
["Pat","Tetelna Volcanics","Pennsylvanian","Chiefly dark-green, dark-gray-green, and purplish-gray-green volcanic flows, mud and debris avalanches, locally graded, and lapilli-pumice tuff interbedded with fine- to coarse-grained volcaniclastic rocks.  Flows mainly andesite, unit metamorphosed to l",null,null,"MH002",6120,"Mount Hayes","Meta",6220,"Pat"]
["Pag","Granitic plutons south of Denali fault","Pennsylvanian","Chiefly granite.  Generally medium-grained hypautomorphic granular texture, locally porphyritic.",null,"U-Pb zircon age of 309 Ma, interpreted as intrusive age.  K-Ar  hornblende age of 326 Ma of granodiorite at Rainbow Mountain, older than wall rocks at locality.","MH002",6110,"Mount Hayes","Ign",6110,"PPagi"]
["Trl","Limestone","Late Triassic","Fine- to medium-grained, medium- to massive-bedded limestone.  Generally calcite clasts in a very fine-grained matrix of calcite and quartz.  Moderately to highly recrystallized, locally weakly schistose.","Late Triassic cephalopods and pelecypods.",null,"MH002",4030,"Mount Hayes","Sed",4030,"JTrlm"]
["Trnf","Nikolai Greenstone -- Subaerial basalt flows member","Late Triassic","Chiefly dark gray-green, gray, purple, black, or brown, massive amygdaloidal basalt flows.  Fine- to medium-grained.  Includes sparse basaltic breccia and basaltic aquagene tuff and sparse limestone, siltstone, shale, and chert occur in south-central par",null,null,"MH002",4421,"Mount Hayes","Meta",4421,"Trn"]
["Trnp","Nikolai Greenstone -- Pillow basalt flows member","Late Triassic","Chiefly interlayered dark gray-green pillow basalt flows and minor basaltic flow breccia, aquagene and epiclastic tuff, breccia, argillite, and radiolarian chert.  Unit metamorphosed to lower greenschist facies.","Middle or Late Triassic Daonella or Halobia in one locality.",null,"MH002",4422,"Mount Hayes","Meta",4422,"Trn"]
["Pzt","Aquagene tuff, argillite, limestone, chert, andesite tuff, and greenstone","Late Paleozoic","Chiefly andesite flows, mud and debris avalanche deposits, and tuff interbedded with fine- to coarse grained volcaniclastic rocks.  Contains lesser interlayered basaltic aquagene tuff, gray-green andesite tuf, gray-green basalt, dark-gray siliceous argil","Fragements of Late Paleozoic bryozoans.  Correlative unit in Talkeetna Mountains D-2 quadrangle contains Early to Late Permian conodonts.",null,"MH002",5630,"Mount Hayes","Meta",6120,"Pat"]
["mha","Metamorphosed hornblende andesite","Late Paleozoic?","Porphyritic hornblende andesite metamorphosed mainly to  lower greenschist facies.  Metamorphic grade increases to lower amphibolite facies adjacent to metamorphosed granitic and gabbroic plutons; later retrogressed to lower greenschist facies.  Schistos",null,null,"MH002",5550,"Mount Hayes","Meta",5550,"PPast"]
["Q","Undifferentiated surficial deposits","Quaternary","The deposits include alluvium, colluvium, talus, landslides, rock glaciers, eolian and paludal deposits, and a variety of lacustrine, morainal, and ice contact.",null,null,"VA002",100,"Valdez","Unconsol",100,"Qs"]
["Tif","felsic to intermediate hypabyssal intrusive rocks","Tertiary","Dikes, sills, and small stocks, compositionally diverse, dacite predominates but rocks range from rhyodacite to quartz latite and andesite.",null,"K-Ar age of 47 and 52 Ma reported as well as numerous 40 to 50 Ma ages and some as young as Pliocene.","VA002",null,"Valdez","Ign",1007,"Thf"]
["QTw","Wrangell Lava","Quaternary and Tertiary?","At least 2,000 m of flows, tephra, and minor sedimentary rocks in northeastern Valdez quadrangle.  Consists of mainly pyroxene andesite but ranges from basalt to dacite.",null,"Dates as old as 2.7 to 10 Ma in adjacent Nabesna quadrangle, thought to be largely Quaternary in Valdez quadrangle.","VA002",455,"Valdez","Ign",455,"QTw"]
["Kb","Berg Creek Formation","Early Cretaceous","Marine clastic rocks consisting of calcareous conglomerate, conglomeratic sandstone and siltstone, and calcarenite.  Basal strata generally are pebble, cobble, and boulder conglomerate consisting of clasts derived from nearby bedrock.","Inoceramus",null,"VA002",2110,"Valdez","Sed",2110,"Kbc"]
["Js","Unnamed Jurassic marine sedimentary rocks","Middle Jurassic (Callovian)?","Marine clastic rocks consisting mostly of sandstone, siltstone, and mudstone, which contain many interbeds of pebble- and cobble-conglomerate.  Greenish-gray sandstone predominates in lower part of the sequence, in many places it is calcareous and cross-","Unnamed Callovian fossils",null,"VA002",3120,"Valdez","Sed",3120,"Juc"]
["Jk","Kotsina Conglomerate","Middle or Late Jurassic?","Well-indurated massive to very thick-bedded cobble- and pebble-conglomerate, with some bouldery strata.  Olive-gray lithic and feldspathic sandstone, siltstone, and carbonaceous shale are interbedded in many places and increase in proportion west of Long","Plant scraps","K-Ar age on biotite from a clast of 161 Ma and on hornblende from cross-cutting dike of 145 Ma","VA002",3110,"Valdez","Sed",3110,"Jkt"]
["JTrm","McCarthy Formation -- lower member","Early Jurassic? and Late Triassic (Norian)","Marine limestone, shale, and chert.  Lower member consists of interbedded finely-laminated, dark-gray, impure limestone, subordinate fissile shale, and minor chert.","Monotis and both calcareous and silicieous microfossils.","Minimum age from intruding granodiorite of 144 Ma","VA002",3821,"Valdez","Sed",3821,"JTrmc"]
["Trl","Chitistone and Nizina Limestones","Late Triassic (Karnian and Norian)","Light- to medium-gray limestone of diverse textural varieties and include minor dolomite lower in the sequence and nodules and lenses of dark-gray chert high in the sequence.  Lower thicker-bedded sequence is Chitistone Limestone, upper, thinner-bedded s",null,null,"VA002",4030,"Valdez","Sed",4030,"JTrlm"]
["Trn","Nikolai Greenstone","Middle and (or) Late Triassic","Weakly metamorphosed, lightly altered tholeiitic basalt that is characteristically amygdaloidal and poorly bedded.  Metamorphosed to prehnite-pumpellyite facies",null,"K-Ar whole-rock isochron of 112 +/- 11 Ma thought to indicate collosion of Wrangellia with North America","VA002",4420,"Valdez","Ign",4420,"Trn"]
["Pzs","Skolai Group -- greenstone unit","Late Paleozoic, Middle Pennsylvanian to Early Permian","Diverse Upper Paleozoic volcanic, volcaniclastic, and marine sedimentary rocks.  Unit consists largely of two lithologies, map unit Pzs is dark, greenish-gray poorly bedded greenstone, characterized by prehnite-pumpellyite mineral assemblages, locally re",null,null,"VA002",5631,"Valdez","Meta",6220,"Pat"]
["Pzm","Skolai Group -- marble unit","Late Paleozoic, Middle Pennsylvanian to Early Permian","Subordinate light- or medium-gray and buff calcareous rocks, mostly recrystallized to marble but containing scanty fragments of fossils, interbedded with dark-gray calcareous siltstone and shale.  Change unit designator to ma, per Winkler (1998)","Scanty fragments of bryozoans, crinoids, corals, and brachiopods.",null,"VA002",5620,"Valdez","Meta",5955,"Pzskm"]
["Psm","Strelna Metamorphic Complex","Mesozoic or Paleozoic","A diverse and intimately mixed group of low- to medium-grade greenschist and amphibolite which also includes abundant pelitic and psammitic schist, metachert, and gneiss having pronouced mortar structure.  Contains no marble but does contain extensive ma",null,"K-Ar age on hornblende from metagabbro of 152 +/- 6 Ma; thought to be reset.","VA002",5209,"Valdez","Meta",5920,"PPast"]
["Tg","Granite and granodiorite","Tertiary? (Eocene?)","Two small discordant stocks of biotite-hornblende granite and granodiorite.  Unfoliated, fine- to medium-grained hypiomorphic granular rocks.  Equal proportions granite and granodiorite.",null,null,"VA002",1305,"Valdez","Ign",1300,"Tgr"]
["Jc","Chitina Valley batholith","Late Jurassic","Weakly to strongly foliated compositionally diverse plutonic rocks.  Dominant lithology is fine-to medium-grained hypiomorphic granular quartz monzodiorite, but quartz diorite, tonalite, and granodiorite are nearly as abundant.",null,"K-Ar hornblende ages range from 147 +/- 7 to 157 +/- 8 Ma, biotite ages are 134 and 144 +/- 7 Ma; one mineral pair is slightly discordant.","VA002",3403,"Valdez","Ign",3403,"Jqd"]
["Pzg","Gabbro and leucogabbro","Late Paleozoic, Permian to Pennsylvanian","Gabbroic rocks rocks consisting of sills, dikes, and discordant plutons.  Medium- to coarse-grained, massive to foliated, altered gabbro, leucogabbro, and minor diorite.  Coextensive with layered gabbro in the McCarthy quadrangle.",null,"K-Ar age on actinolitic amphibole of 246 +/- 12 Ma, thought to be minimum age, may be partially reset by intrusion of nearby Late Jurassic hornblende granodiorite pluton.","VA002",5460,"Valdez","Ign",5460,"Pagb"]
["Klc","Schist of Liberty Creek","mid-Cretaceous? or Jurassic??","Well-foliated, multiply-deformed greenschist and transitional blueschist facies mafic metavolcanic and metasedimentary rocks.  Schistocity is well-developed although primary sedimentary or volcaniclastic features are retained locally.  There are no marke",null,null,"VA002",3610,"Valdez","Meta",3610,"Jsch"]
["Kbc","Bernard Creek terrane, deleted, now McHugh Complex","mid-Cretaceous?","Mylonitic greenschist.  Relict bedding and volcaniclastic textures are retained locally.  Elsewhere unit is nearly massive, but cataclasis and neomineralization generally are so pervasive that they obliterate any primary features.",null,null,"VA002",2190,"Valdez","Meta",2190,"Kmk"]
["Kfc","Fox Creek terrane  Unit deleted on new VA map","mid-Cretaceous?","Intercalcated lower greenschist and transistional blueschist facies metasedimentary and mafic metavolcanic rocks.  Over broad areas the rocks have a cataclastic fabric, locally relict primary sedimentary and volcaniclastic textures are retained.  Unit is",null,null,"VA002",2700,"Valdez","Meta",2700,"Kvs"]
["Khc","Haley Creek terrane","mid-Cretaceous?","Metamorphosed complexly deformed and tectonically mixed plutonic and sedimentary rocks.  Metaplutonic rocks are most abundant in southern part of the terrane and are compositionally diverse and weakly to strongly foliated.  Although diorite and granodior",null,null,"VA002",2601,"Valdez","Meta",2600,"Kmi"]
["Kag","Haley Creek terrane -- metaplutonic rocks","mid-Cretaceous?","Metamorphosed complexly deformed and tectonically mixed plutonic and sedimentary rocks.  Metaplutonic rocks are most abundant in southern part of the terrane and are compositionally diverse and weakly to strongly foliated.  Although diorite and granodior",null,"K-Ar ages on hornblende range from 122 to 148 Ma.  A muscovite age is 133 +/- 4 Ma","VA002",2600,"Valdez","Meta",2600,"Kmi"]
["M","Haley Creek terrane -- schistose marble","mid-Cretaceous?","Schistose marble.  Individual marble layers can be traced for several km, however the layers vary greatly in thickness, terminate abruptly in places, and are generally thoroughly folded.  Small isolated bodies of marble mark unmapped fault within the Hal",null,"K-Ar ages on hornblende range from 122 to 148 Ma.  A muscovite age is 133 +/- 4 Ma","VA002",2720,"Valdez","Meta",2720,"PPaskm"]
["Tif","Hornblende andesite or dacite dikes","Eocene","Porphyritic hornblende andesite or dacite dikes",null,null,"VA002",null,"Valdez","Ign",1105,"Tva"]
["Tt","Altered biotite and hornblende tonalite","Eocene","Small, sericitized hornblende-biotite tonalite plugs.  Rocks are fine- to medium-grained sericitized tonalite with minor quartz diorite and granodiorite.  In most sample, muscovite replaces biotite or has formed from alteration of plagioclase.",null,"K-Ar hornblende 46.6 +/- 1.4 and muscovite of 52.4 +/- 2.6 Ma","VA002",1310,"Valdez","Ign",1310,"Tegr"]
["Jgl","Hornblende gabbro and leucogabbro","Early Jurassic or older","Layered gabbro and leucogabbro; layered gabbro is dominantly hornblende gabbro; hornblende-augite gabbro is common, however, with the hornblende replacing or molded upon the augite; and layers and lenses of hornblendite occur at several places.  Mafic pa",null,"K-Ar ages on hornblende of 419+/- 21, 188 +/- 8, and 171 +/- 5 Ma; the older age is considered suspect.","VA002",3540,"Valdez","Ign",3540,"Jmu"]
["Jum","Ultramafic rocks","Early Jurassic or older","Dunite, harzburgitic dunite, wehrlite, websterite, and clinopyroxenite comprise the Tonsina ultramafic complex.  The rocks are folded but not intensely sheared or serpentinized.",null,null,"VA002",null,"Valdez","Ign",3545,"Jmu"]
["Kmu","Matanuska Formation -- upper part","Late Cretaceous -- mid-Coniacian to Maestrichtian","A very thick sequence of marine siltstone, claystone, and sandstone in interbedded with lenticular and channelized deposits of sandstone and conglomerate.  Contact with lower part of unit presumed to an unconformity.  Deposition thought to occur on the f",null,null,"VA002",2011,"Valdez","Sed",2010,"Km"]
["Kml","Matanuska Formation -- lower part","Late Cretaceous -- late-early-Albian, Cenomanian, Turonian, and early Coniacian","Marine siltstone, shale, sandstone, and pebbly sandstone are interbedded with subordinate silicieous, foraminiferal shale and fine-grained zeolitized sandstone.  Contact with upper part of unit (unit Kmu) presumed to be an unconformity and is angular unc",null,null,"VA002",2012,"Valdez","Sed",2010,"Km"]
["Jtk","Talkeetna Formation","Early Jurassic","Marine and non-marine andesitic and basaltic tuff, tuff breccia, and volcanogenic sedimentary rocks.  Small, isolated bodies of light- to dark-gray unfossiliferous saccharoidal limestone may be parts of the units in the Valdez quadrangle.","Mollusks and brachiopods",null,"VA002",3250,"Valdez","Ign",3250,"JTrtk"]
["Jgr","Biotite-epidote granite","Middle Jurassic","Irregularily shaped small stocks of pink-weathering medium-grained granite.  Green biotite and granular to coarse-grained epidote are constant accessories",null,null,"VA002",3401,"Valdez","Ign",3401,"Jgr"]
["Jgd","Biotite-hornblende granodiorite","Middle Jurassic","Irregularily shaped small stocks of pink-weathering medium-grained granite.  Green biotite is a constant accessory; hornblende and epidote are less abundant and are not present in all samples.",null,null,"VA002",591,"Valdez","Ign",3402,"Jgd"]
["Jmp","Mafic plutonic complex","Early or Middle Jurassic","Consists dominantly of layered hornblended-pyroxene gabbro and leucogabbro, with minor ultramafic, dioritic, and tonalitic rocks.  The southern margin of complex is a major fault zone; cataclastic modification of mineral layering in the complex near the",null,"K-Ar ages on low-potassium hornblende and chloritized biotite range from 153 to 171 Ma.","VA002",null,"Valdez","Ign",3480,"Jan"]
["Ju","Ultramafic rocks","Jurassic?","Serpentized pyroxenite?  Occurs within mafic plutonic complex (unit Jmp), generally localized in strongly sheared zones.  Many areas of unit are too small to map.",null,null,"VA002",3345,"Valdez","Ign",3345,"Jmu"]
["Tov","Orca Group -- volcanic rocks, undivided","Paleocene and Eocene?","Tholeiitic pillow basalt, pillow breccia, and minor aquagene tuff.  Thin sequences of  dray-gray argillite and siltstone are interbedded with the volcanic rocks and locally compressed between pillows.  Volcanic rocks are exclusively of oceanic tholeiite",null,null,"VA002",1135,"Valdez","Ign",1135,"Tov"]
["Tos","Orca Group -- sedimentary rocks, undivided","Paleocene and Eocene?","Marine argillite, siltstone, sandstone, and conglomerate.  Argillite and siltstone are more abundant the coarser-grained rocks.  Well-bedded, repetitive finer-grained and coarser-grained strata; primary sedimentary features are diagnostic of deposition b",null,null,"VA002",950,"Valdez","Sed",950,"Tos"]
["Toc","Orca Group -- conglomeratic sedimentary rocks","Paleocene and Eocene?","Very poorly bedded conglomeratic sandstone and argillite mantle the tops of volcanic sequences.  Conglomeratic rocks are very poorly sorted; clasts vary in size from granules to boulders and are supported by matrix.  Basal parts of conglomeratic frequent",null,null,"VA002",952,"Valdez","Sed",952,"Toc"]
["TKm","Orca Group -- melange","Tertiary or Cretaceous","Consists of extensive serpentinized ultramafic rocks including dike-like bodies of rodingite, as well as blocks of layered gabbro, crossite schist, pillow basalt, marble, chert of probable Late Triassic or Early Jurassic age, and diverse metamorphosed an",null,null,"VA002",null,"Valdez","Melange",1790,"TKmx"]
["Kvv","Valdez Group -- Metavolcanic rocks, undivided","Late Cretaceous","Mafic metatuff and minor massive or weakly foliated greenstone having rarely preserved vague pillow shapes.  Lower greenschist facies metamorphism.  Most of these metavolcanic rocks are schistose and the metavolcanic are often the loci of intense deforma",null,"K-Ar whole-rock age on metatuff of 53.5 +/- 1.6 Ma is thought to date matamorphism.","VA002",2705,"Valdez","Meta",2705,"Kvv"]
["Kvs","Valdez Group -- Metasedimentary rocks, undivided","Late Cretaceous","Weakly to strongly foliated marine argillite, siltstone, sandstone, and conglomeratic sandstone.  Lower greenschist facies metamorphism.  Probable volcanic source terrane.","Maestrichtian pelecypods collected outside of Valdez quadrangle.",null,"VA002",2700,"Valdez","Meta",2700,"Kvs"]
["Kvm","Valdez Group -- Phyllite and schist. Delete unit on new VA map","Late Cretaceous","Low-grade metamorphosed (lower greenschist facies) pelitic rocks consisting of homogeneous phyllite and schist.  These rocks shown much stronger foliation than the undivided metasedimentary rocks (unit Kvs) of the Valdez Group.  Probable volcanic source",null,null,"VA002",2701,"Valdez","Meta",2700,"Kvs"]
["KJm","McHugh Complex","Early Cretaceous and Jurassic?","Pervasively deformed assemblage of diverse lithologies (melange).  Lithologies include gabbro, greenstone, marble, wacke, and diverse plutonic and metamorphic rocks including blueschist.  Rocks occur in three discrete belts, the northernmost which yields","Radiolaria from chert ranges from Triassic to mid-Cretaceous (Albian or Cenomanian).",null,"VA002",2190,"Valdez","Melange",2190,"Kmk"]
["Jgb","Greenschist and transitional blueschist","Jurassic","Chiefly intercalated greenschist and blueschist, but includes lawsonite, muscovite, or actinolite schist, carbonaceous schist, highly siliceous rocks containing stilpnomelane, and foliated calcareous rocks.  Similar to Raspberry, Seldovia, and Knik River",null,"K-Ar ages on crossite and muscovite range from 152 to 175 Ma, thought to be metamorphic ages.","VA002",null,"Valdez","Meta",3610,"Jsch"]
["Ja","Amphibolite facies rocks","Jurassic(?)","Portion of tectonic inclusion 10 by 15 km in McHugh Complex consisting of layered quartz gabbro, amphibolite, and orthogneiss.  This unit consists of nondescript, amphibolite facies, weakly foliated to nonfoliated granular rocks of uncertain protolith.",null,null,"VA002",5920,"Valdez","Meta",5920,"PPast"]
["Jag","Uranatina River metaplutonic unit","Jurassic and Middle Pennsylvanian","Portion of tectonic inclusion 10 by 15 km in McHugh Complex consisting of layered quartz gabbro, amphibolite, and orthogneiss.  This unit consists of compositionally banded very mafic amphibolite to hornblende-biotie dioritic and quartz dioritic gneiss.",null,"Low-potassium hornblende yielded K-Ar age of 267 +/- 8 Ma (mid-Permian), thought to approximate time of metamorphism.","VA002",5245,"Valdez","Meta",5245,"JPaur"]
["Jlg","Layered quartz gabbro","Jurassic","Conspicously layered, hypiodiomorphic-granular textured quartz gabbro.  Layers enriched in clinopyroxene or in plagioclase and quartz give unit its prominent banded appearance.  Prehnite-pumpellyite metamorphosed, little deformed and dips quite uniformly",null,"K-Ar age on pyroxene of 185 +/- 19 Ma is highly suspect, however matches ages on Afognak Pluton, the pluton of the Barren Islands and reputed ages on small dioritic plutons near Seldovia.","VA002",null,"Valdez","Ign",3340,"Jmu"]
["Qp","Placer mine tailings","Holocene (Historic)","Symmetrical to irregular piles of artificially water-worked, sorted gravel and in situ slab rock derived from bedrock.",null,null,"ID002",100,"Iditarod","Unconsol",100,"Qpm"]
["QTs","Surficial deposits","Holocene to Pliocene(?)","Unconsolidated fluvial, terrace, colluvial, glacial, and eolian deposits, usually covered by vegetation.  Deposits range between 3 and 20 m thick and generally contain permafrost to some degree.  Unit primarily Pleistocene to Holocene in age, however str",null,null,"ID002",100,"Iditarod","Unconsol",100,"Qs"]
["Tb","Basaltic andesite","Tertiary -- Miocene","Very fine grained to aphanitic, dark- to medium-gray, locally vesicular, augite basaltic andesite.",null,"K-Ar whole-rock age of 6.9 and 13.0 Ma","ID002",200,"Iditarod","Ign",1052,"Tba"]
["TKy","Volcanic rocks of Yetna River area","Tertiary and Late Cretaceous","Chiefly subaerial lava flows of andesite, dacite, rhyolite, and minor basalt and subordinate welded to nonwelded rhyolitic to andesitic ash-flow tuff.",null,"Eight of nine samples yielded K-Ar ages between 54.4 and 68.7 Ma, ninth sample yielded age of 25.5 Ma on tuff.","ID002",301,"Iditarod","Ign",1605,"TKvi"]
["TKil","Iditarod Volcanics -- Andesitic to basaltic subaerial lava flows and mafic volcanic breccia","Tertiary and Late Cretaceous","Subaerial, locally columnar-jointed, aphanitic to porphyritic, olivine-clinopyroxene basaltic andesite, clinopyroxene andesite, and minor dacite; volcanic breccia locally interfingers with flow rocks.",null,"K-Ar ages from 4 samples ranged between 58 and 66 Ma; one whole-rock yielded a 35.1 Ma minimum age.","ID002",302,"Iditarod","Ign",1605,"TKvi"]
["Kit","Iditarod Volcanics -- Tuff, volcanic breccia, altered andesitic to dacitic flows and volcaniclastic sandstone","Late Cretaceous","Heterogeneous assemblage characterized by lithic, crystal, and water-laid tuff and altered intermediate lava flows.; locally includes volcanic breccia, volcaniclastic sandstone, and lahar deposits.  Lithologically identical to unit Kkt; distinguished by",null,"K-Ar ages from 5 samples ranged between 70.3 to 76.7 Ma; two youngest are considered minimum ages.","ID002",400,"Iditarod","Ign",2270,"Kvl"]
["Kkq","Kuskokwim Group -- quartzose sandstone and siltstone","Late Cretaceous, (Paleocene?) Campanian to Turonian?","Quartzose sublithic sandstone, conglomerate, siltstone, and siliceous shale.  Finer-grained layers locally contain abundant coaly leaf and stem debris; thin coal seams are present locally.  Coquina layers composed of brackish to fresh water bivalves are","Dicotyedon leaf fragment of probable Turonian to Paleocene age but may be as old as Cenomanian.","K-Ar age of 77 Ma on interbedded andesite tuff in upper part of section.","ID002",401,"Iditarod","Sed",1985,"Kkn"]
["Kks","Kuskokwim Group -- sandstone, siltstone, shale, and conglomerate","Late Cretaceous, Campanian? to Cenomanian?","Thick assemblage of fine- to coarse-grained lithic sandstone, micaceous siltstone, shale, and minor chert-pebble conglomerate; major part of Kuskokwim Group in quadrangle.  Sandstone is lithic rich; nearly all contain metamorphic lithic fragments, but pl","Pelecypods of Turonian or probable Turonian age but may be as old as Cenomanian based on fossils outside of Iditarod quadrangle.",null,"ID002",402,"Iditarod","Sed",1970,"Kk"]
["Kkt","Kuskokwim Group -- volcanic tuff and agglomerate","Late Cretaceous","Hetergeneous assemblage of tuff, agglomerate, cherty tuff and locally, minor sandstone.  Lithologically identical to unit Kit, units only distinguished by surrounding rocks.",null,"K-Ar ages of 69.4 and 71.3 Ma on whole rocks, questionable due to alteration.","ID002",403,"Iditarod","Ign",2260,"Kvl"]
["Kka","Kuskokwim Group -- altered andesite flows, tuffs, and sills?","Late Cretaceous; Campanian","Layers of intermediate igneous rocks 1 to 5-m-thick interbedded with unit Kks.  Consists of andesitic flows and tuffs, and possible sills.",null,"K-Ar age of 77 Ma","ID002",404,"Iditarod","Ign",2261,"Kvl"]
["Kkv","Kuskokwim Group -- volcanic flow(s) and tuff","Late Cretaceous","Hornblende-clinopyroxene andesitic volcanic flow(s) and chlorite-calcite altered tuff.  Interbedded with unit Kks.",null,null,"ID002",405,"Iditarod","Ign",2261,"Kvl"]
["Ks","Sandstone and siltstone","Early Cretaceous","Medium-grained to very fine grained sandstone, tuffaceous sandstone, and siltstone only exposed as colluvial chips in western part of Iditarod quadrangle.","Age based on Hauterivian to Barremian palynomorphs in one sample.",null,"ID002",406,"Iditarod","Sed",2020,"Kme"]
["TrMc","Chert, volcanic rocks, metasandstone, and limestone","Triassic to Mississippian","Radiolarian chert, clinopyroxene basalt to basaltic andesite, lithic tuff, water-laid tuff, metasiltstone, and minor fossiliferous shallow-water limestone.  Occurs as fault slivers? in northeastern part of Iditarod quadrangle or associated with the Dishn","Late Triassic (or possibly Jurassic) radiolarians and conodonts and crinoidal hash no older than mid-Mississippian.","K-Ar hornblende age of 302 +/- 9 Ma on porphyritic volcanic rock; 3 K-Ar whole-rock ages on greenstones (88.4 +/- 2.7, 110 +/- 3, 76.5 +/- 2.3 Ma)","ID002",500,"Iditarod","Ign",5111,"TrMica"]
["Tp","Porphyritic granodiorite plug","Early Tertiary","Granodiorite consisting of abundant phenocrysts of hornblende and plagioclase in a finer-grained, phaneritic groundmass.",null,"K-Ar age on amphibole of 52.8 Ma","ID002",201,"Iditarod","Ign",1300,"Tegr"]
["TKgp","Hypabyssal granite porphyry dikes, sills, and plugs","Tertiary and Late Cretaceous","Porphyritic to fine-grained phaneritic dikes, sills, and plugs of granitic composition.",null,"22 K-Ar ages in two groups; 71.5 to 69.1 Ma and 65.7 to 63.5 Ma.  Most reliable ages all in older group (FHW).","ID002",303,"Iditarod","Ign",1602,"TKgp"]
["TKp","Pilotaxitic dacite-andesite plugs","Tertiary and Late Cretaceous","Three small bodies of subvolcanic dacite to andesite.  Pilotaxitic texture to the fine-grained groundmass.  Sparse phenocrysts of granophyric plagioclase and rare pyroxene.",null,null,"ID002",304,"Iditarod","Ign",1620,"TKd"]
["TKm","Monzonite, quartz monzonite, syenite, granodiorite, granite, and minor lamprophyre","Tertiary and Late Cretaceous","Small stocks and plutons of fine- to coarse-grained, phaneritic to hypidiomorphic, clinopyroxene-biotite +/- olivine monzonite, hornblende-clinopyroxene-biotite quartz monzonite, biotite syenite, biotite-hornblende granodiorite, biotite granite, and rare",null,"20 K-Ar ages have bimodal distribution, 73.2 to 68.3 Ma and 63.4 to 59.4 Ma.  Many of the younger ages are suspect due to very low K2O in the biotites (FHW).","ID002",305,"Iditarod","Ign",1660,"TKm"]
["TKd","Altered intermediate to mafic dikes","Tertiary and Late Cretaceous","Porphyritic biotite-clinopyroxene-plagioclase +/- olivine dikes, which are partly to extensively altered to chlorite-calcite-silica assemblages.",null,"K-Ar age on biotite of 71.2 Ma","ID002",306,"Iditarod","Ign",1601,"TKd"]
["TKg","Alkali granite","Tertiary and Cretaceous","Poorly exposed, medium-grained, granophyric alkali granite  Light colored unit (CI < 7) containing varying mafic mineral assemblages, alkali amphibole-pyroxene-biotite to chloritized biotite",null,"K-Ar age on biotite of 140 Ma, suspect due to extremely low K2O, amphibole age from adjacent Holy Cross quadrangle of 62.9 Ma","ID002",307,"Iditarod","Ign",1655,"TKg"]
["Jdr","Dishna River mafic and ultramafic rocks","Jurassic","Poorly exposed mafic and ultramafic that include two-pyroxene gabbronorite, clinopyroxene-hornblende gabbro, hornblende gabbro, diabase, harzburgite, minor dunite, and rare pyroxenite.  Original igneous textures well preserved in most samples, however se",null,"Dubious K-Ar ages on hornblende (replicated) of 222 +/- 23 and 228 +/- 25 Ma and 92.2 +/- 2.8 Ma","ID002",600,"Iditarod","Ign",5191,"Jium"]
["PzPlg","Greenschist, pelitic schist, and metagranite","Paleozoic and Proterzoic?","Generally poorly exposed, mixed assemblage of greenschist facies metamorphic rocks including mafic meta-igneous rocks, subordinate metasedimentary rocks (pelitic schist, phyllite, calcareous schist, and quartzite) and minor granitic orthogneiss.",null,"K-Ar biotite age from granitic orthogneiss was 108 Ma, thought to be post-metamorphic cooling age.","ID002",700,"Iditarod","Meta",8650,"PzZrmc"]
["Xi","Idono Complex","Early Proterozoic","Foliated meta-plutonic rocks, lesser amphibolite, and minor metasedimentary rocks.  Compositionally diverse metaplutonic rocks are primarily biotite +/- muscovite granitic orthogneiss but include orthogneiss of tonalitic, granodioritic, quartz dioritic,",null,"U-Pb zircon age of 2.06 Ga; K-Ar ages range from approximately 120 Ma to approximately 1,230 Ma.","ID002",800,"Iditarod","Meta",9400,"Xi"]
["g","Glaciers and superglacial moraine","Holocene","Exposed glacial ice locally mantled by unsorted jumbles of fresh boulders, cobbles, sand, silt, and mud as much as several meters thick.",null,null,"AN002",101,"Anchorage","Unconsol",101,"g"]
["Qs","Surficial deposits","Quaternary","Widespread glacial, alluvial, colluvial, and lacustrine deposits, rock glaciers, and landslides; have not been subdivided. Glacial deposits include extensive ground, lateral and terminal moraines, and associated outwash deposited during several advances",null,null,"AN002",100,"Anchorage","Unconsol",100,"Qs"]
["Ttk","Tyonek Formation","Miocene","Carbonaceous sandstone, siltstone, shale, and claystone in several isolated outcrops near the town of Eagle River and along the Little Susitna River south of the Castle Mountain fault .  Maybe correlative with Tyonek Formation of upper Cook Inlet.  Outcr","early Seldovian Stage plants remains",null,"AN002",300,"Anchorage","Sed",600,"Tty"]
["Tv","Volcanic Rocks","Miocene to Paleocene","Upper part of sequence consists of andesite and basalt flows and minor rhyolitic tuff, lithofeldspathic sandstone, and fluviatile conglomerate.  Lower part consists of stocks, dikes, lenticular flows, and pyroclastic rocks, chiefly of quartz latite, and","Near Nelchina volcaniclastics contain Eocene plant fossils","Whole-rock K-Ar age 60 ma near middle of sequence; whole-rock ages of 54 to 56 ma from volcanic rocks in the Arkose Ridge Formation","AN002",310,"Anchorage","Ign",1000,"Tvu"]
["Tt","Tsadaka Formation","Oligocene","Poorly sorted cobble to boulder conglomerate, consisting of plutonic clasts, interbedded with lenses of feldspathic sandstone, siltstone, and shale.  Local provenance, rapid lateral lithology and thickness changes;  correlative with the Hemlock Conglomer",null,null,"AN002",320,"Anchorage","Sed",670,"Tts"]
["Tw","Wishbone Formation","Eocene","Fluvialtile conglomerate and thick interbeds of sandstone, siltstone, and claystone, with local partings of volcanic ash. Extends at least 30 km northward intoTalkeetna quadrangle.  South of Castle Mountain and Caribou faults, contact with Chickaloon For",null,null,"AN002",330,"Anchorage","Sed",870,"Tw"]
["Tc","Chickaloon Formation","Eocene and Paleocene","Fluvialtile and alluvial carbonaceous mudstone, siltstone, conglomeratic sandstone, and polymictic conglomerate.  Middle and upper portions of unit contain numerous beds of bituminous coal; lower part consists of conglomerate and lithic sandstone.  A loc","Lower part extn\\ends into Paleocene based on plant leaves which correlate to flora present in the Fort Union Formation.  Also palonology studies by oil  industry.","K-Ar and fission-track ages ranging from 56 to 53 Ma on ash partings from coal beds in the upper Chickaloon NW of Jonesville","AN002",340,"Anchorage","Sed",900,"Tch"]
["Tar","Arkose Ridge Fomation","Eocene and Paleocene","Fluviatile and alluvial feldspathic and biotite-bearing sandstone, conglomerate, siltstone, and shale and thin beds of lignitic coal.  West of Chickaloon River, lower part of formation contains intercalated basalt flows and rhyolite tuffs which may corre","abundant plant fragments some of late Paleocene age","metamorphic biotite age of 67.5  +/- 2.4; K-Ar whole rock dates range from 56 to46 Ma for lower part of fm.;K-Ar whole rock date of 46 Ma for a basalt dike from the middle of the fm.","AN002",350,"Anchorage","Sed",890,"Tar"]
["Km","Matanuska Formation","Late and Early Cretaceous (Albian to Maestrichtian)","Fossiliferous marine shale containing conspicuous calcerous concretions and volcanic-lithic siltstone, sandstone, and subordinate conglomerate ;diverse shallow -to-deep marine (turbiditic) deposits.  Upper part, at least, is coeval with the Valdez Group",null,null,"AN002",400,"Anchorage","Sed",2010,"Km"]
["Jn","Naknek Formation","Late Jurassic (Oxfordian to late Kimeridgian)","Thin- to thck-bedded, fossiliferous marine siltstone, shale, and litho-feldspathic sandstone and conglomerate.   Principally composed of pluton and volcanic detritus.  Lower contact disconformable to slight angular unconformity and upper contact is uncon",null,null,"AN002",500,"Anchorage","Sed",3010,"Jn"]
["Jc","Chinitna Formation","Middle Jurassic (late Bathonian (?) and early and middle Callovian)","Shallow- marine shale, siltstone, and subordinate sandstone  containing numerous large limestone concretions; incorporates volcanic and plutonic detritus from the Talkeetna arc.  Disconformably overlies Tuxedni Group.  Thickness varies locally but is as","type not described but age late early Callovian",null,"AN002",510,"Anchorage","Sed",3030,"Jc"]
["Jt","Tuxedni Group","Middle Jurassic (Bajocian and Bathonian Stages)","Fossiliferous shallow-marine siltstone, shale, and sandstone; upper part consists of thin- to thick-bedded, dark siltstone and shale; lower part consists of thin- to thick-bedded sandstone which is pebbly in places.  Lower contact is an angular unconform","Three new collections range in age form early and middle Bajocian.",null,"AN002",520,"Anchorage","Sed",3180,"Jtx"]
["Jgd","Granodiorite","Middle Jurassic","Large, discordant, epizonal pluton and two satellitic stocks of hornblende-biotite granodiorite and lesser tonalite and quartz diorite.  Plutons intrude the Talkeetna Fm. (JTrt) and quartz diortite (Jqd) and are overlain nonconformably by the Arkose Ridg",null,"K-Ar  ages in the Talkeetna Mountains range from 173 to 168 Ma and include a concordant mineral pair.  In Chugach Mountains, a date of 175 to 174 Ma by a concordant K-Ar mineral pair was obtained.","AN002",521,"Anchorage","Ign",3402,"Jgd"]
["Jqd","Quartz diorite","Middle Jurassic","Large, disconcordant, epizonal pluton ; medium to coarse-grained hornblende (+/- biotite) quartz diorite, but also includes diorite and tonalite.  Large areas have been sheared and altered.  Intrudes JTrt and Jma and is intruded by Jgd and is overlain no",null,"Discordant K-Ar dates of 169 to 154 Ma (minimum ages)","AN002",522,"Anchorage","Ign",3403,"Jqd"]
["Jqt","Quartz diorite and tonalite","Middle Jurassic","Series of discordant intermediate plutons.  They are relatively homogeneous, fine- to medium-grained quartz diorite and tonalite.  Large areas are sheared and altered.  Plutons intrude JTrt and Jg and are intruded by Jgd",null,"K-Ar ages range from 181 to 167 Ma and include a concordant mineral pair; zircon fission-track ages are 186 and 170 Ma","AN002",523,"Anchorage","Ign",3404,"Jqt"]
["Jmip","Mafic and intermediate plutonic rocks","Middle to Early Jurassic","Complexly intermixed series of mafic to intermediate plutonic rocks.  Plutons consist of gabbronorite, hornblende gabbro, diorite, and tonalite.  Xenoliths of gabbro show ductile deformation as though they still were warm when intruded by silicic magmas.",null,"K-Ar on hornblende and biotite are 194 to 165 Ma.  Twelve other K-Ar dates on hornblende and biotite range from 187 to 160 Ma.  U-Pb zircon ages range form 183 to 171 Ma.","AN002",524,"Anchorage","Ign",3405,"Jmu"]
["Jg","Gabbronorite","Middle to Early Jurassic","Fine- to coarse-grained gabbroic rocks consisting primarily of gabbronorite, leucogabbronorite, and pyroxene-hornblende gabbro, lesser hornblende gabbro, and minor anorthisitic gabbro.  Primary magnetite and illmenite are abundant (as much as 15 percent)",null,"K-Ar dates of about 177 Ma compare well with K-Ar  and Ar/Ar dates from Valdez quad rocks (ranging from 181-175 Ma).","AN002",525,"Anchorage","Ign",3490,"Jmu"]
["Jgs","Sheared gabbronorite","Middle to Early Jurassic","Intensely sheared and altered serpentinized gabbroic and ultramafic rocks.  Serpentinized rocks occurr in most outcrops of gabbronorite (Jg) but have been mapped separately between the Nelchina and Matanuska Glaciers.",null,null,"AN002",526,"Anchorage","Ign",3491,"Jmu"]
["Jum","Ultramafic and mafic rocks","Middle to Early Jurassic","Cumulate ultramafics and mafics forming two large fault-bounded sequences in the northern Chugach Mountains; the Eklutna and Wolverine complexes.  The Eklutna is 2-3 km thick and 11 km long.   From base to top consists of chromite-bearing dunite, wehrlit",null,"Both sequeces are undated but are intruded by dikes and plutons of Jmip.","AN002",527,"Anchorage","Ign",3495,"Jmu"]
["Jma","Amphibolite and quartz diorite","Middle to Early Jurassic","Intricately intermixed amphibolite, foliated quartz diorite, and lesser trondhjemite.  Some minor biotite-quartz-feldspar gneiss.",null,"Correlated to rocks of the Talkeetna Moutains quad that have a K-Ar date of 176 Ma","AN002",528,"Anchorage","Meta",5550,"PPast"]
["Jps","Pelitic schist","Jurassic","Quartz-muscovite-albite-chlorite (+/- garnet-biotite) pelitic schist.  Uniform in lithology and has no correlative rocks nearby.  Minerology indicates retrograded greenschist metamorphism.  Age of prograde metamorphism is inferred to be Jurassic.",null,"K-Ar on muscovite from schist ranges from 66 - 51 Ma are presumed to be reset by intrusion of  TKt and TKg","AN002",529,"Anchorage","Meta",3700,"Jps"]
["JTrt","Talkeetna Formation","Early Jurassic to Late Triassic","Andesitic, dacitic, and basaltic flows, flow breccia, tuff, shallow sills, and agglomerate.  In many places contains subordinate interbedded volcaniclastic sandstone, conglomerate, and fossiliferous marine siltstone and shale.  Limestone and marble bodie",null,null,"AN002",530,"Anchorage","Ign",3250,"JTrtk"]
["JPzm","Metamorphic rocks undivided",null,"Metasedimentary and metavolcanic rocks.  Strongly to weakly foliated and variably  metamorphosed from greenschist to amphibolote facies.  Intruded by Jmip and Jg rocks.  Sedimentary protoliths include shale, chert, tuffaceous arenite, and limestone.  Vol","Fusulinids dated as Permian","Minimum age of metamorphism of 177 Ma by K-Ar on actinolite.   This age may have been reset by a nearby 165 Ma pluton.  Hornblende K-Ar ages of 121 and 107 Ma and a hornblende Ar/Ar plateau age of 117 Ma on mafic schist indicate resetting during metamorp","AN002",531,"Anchorage","Meta",5200,"Jsch"]
["Tmg","Granitic phase Miners Bay Pluton","Oligocene","Altered, medium-grained leucrocratic biotite granite pluton and associated dikes.  Granitic rocks include a slightly older mafic phase (Tmm), include both the Valdez and Orca Groups, and are cut by Contact fault",null,"K-Ar age of  32.2+/- 1.6 Ma on biotite","AN002",321,"Anchorage","Ign",1270,"Togr"]
["Tmm","Mafic phase Miners Bay Pluton","Oligocene","Texturally and compositionaly varibale composite mafic pluton east of Unakwik Inlet. Pluton consists of medium-grained clinopyroxene +/- orthopyroxene gabbro and lesser  clinopyroxene-bearing diorite.  Quartz gabbro and quartz diorite occur near pluton m",null,"K-Ar age of  38.4+/- 1.9 Ma on hornblende","AN002",322,"Anchorage","Ign",1292,"Toem"]
["Tgg","Granite and granodiorite","Oligocene or Eocene","Small plutons west of Columbia Glacier and south of Wells Bay that are coextensive with the Cedar Bay Granite and numeraous leucocratic dikes that intrude the Orca Group.  Plutons consist of  biotite+/- hornblende rganite and granodioriteic border phases",null,"K-Ar age of  38.4+/- 1.9 Ma on hornblende","AN002",323,"Anchorage","Ign",1290,"Toegr"]
["Tfp","Felsic Intrusions","Eocene","Leucocratic dikes, sills, and small stocks occurring widely south of Border Ranges fault.  Only a few meters thick but laterally extensive; Dacite predominates, but rholite also is present.  Intrusions usually are pophyritic with fine-to medium-grained p",null,"Two groups apparent using K-Ar and fission track: older group 55-48 Ma  and younger group 44-43 Ma.  Near Anchorage, a K-Ar age of  34 from a hornblende dacite dike","AN002",334,"Anchorage","Ign",1301,"Td"]
["Tim","Hypayssal mafic Intrusions","Eocene","Small stocks and irregular-shaped dikes and sills of diorite porphyry, diabase, basalt, and lamprophyre widely exposed in the Matanuska Valley",null,"Primative initial Sr/Sr and whole-rock K-Ar age of 41 Ma","AN002",331,"Anchorage","Ign",1012,"Thm"]
["Ti","Hypayssal felsic and intermediate intrusions","Eocene","Small stocks and irregular-shaped dikes and sills of rhyolite, quartz latite, latite, and dacite widely exposed in Talkeetna Mountains and the Matanuska Valley. May correlate with felsic volcanic rocks in upper part of unit Tv.",null,"Primative initial Sr/Sr indicate little crustal contamination during intrusion and 4 whole-rock K-Ar age of 46 to 38 Ma for stocks and 3 zircon fission tack ages of 41-37 Ma on felsic intrusions.","AN002",332,"Anchorage","Ign",1011,"Thf"]
["TKc","Calaclasite","Eocene? and Early Cretaceous?","Chlorite-rich, fine-grained granular rocks formed by cataclasis and retrograde alteration of mafic and ultramafic plutonic rocks and mafic volcanic rocks;  May be equivalent lithologically to sheared gabbronorite (Jgs).  Lithologies and fabrics of these",null,"Deformation in the Border Ranges fault is at least as old as Early Cretaceous; however, much of the fabric may be an Eocene overprint from reactivation of the old thrust as a strike-slip  boundary.","AN002",333,"Anchorage","Meta",1710,"TKc"]
["TJds","Mafic and intermediate dikes, sills, stocks","Eocene? to Jurassic?","Numerous compositionally variable, altered dikes, sills, and small stocks intruding the Talkeetna Formation and Jurassic plutonic rocks in the Chugach Mountains.  Rocks types consist of fine-grained basalt, prophyritic andesite, and dacite",null,"Whole-rock K-Ar ages of 130 and 38 Ma for two basalt dikes","AN002",341,"Anchorage","Ign",1012,"Thm"]
["TKg","Granite","early Paleocene and Late Cretaceous","Large, epizonal, biotite-muscovite pluton.  Pluton is principally granite, but also granodiorite and lesser quartz monzonite.",null,"K-Ar ages on muscovite and biotite 67 and 65 Ma, respectively.","AN002",410,"Anchorage","Ign",1655,"TKg"]
["TKt","Tonalite","early Paleocene and Late Cretaceous","Large pluton of predominately biotite-hornblende tonalite and lesser biotite-hornblende quartz diorite.  Pluton is epizonal or mesozonal.  Weakly developed foliation occurs in many places, and orbicular textures are present locally.",null,"K-Ar ages 73-67 Ma (possibly reset).","AN002",420,"Anchorage","Ign",1660,"TKm"]
["Kw","Willow Creek pluton","Late Cretaceous","Pervasively altered, zoned pluton; based on its distincive aeomagnetic signature it is interpreted to extend at least to northern boundary of map area.  Pluton has a 30- to 200-m wide outer margin of hornblende quartz diorite and lesser hornblende tonali",null,"Subconcordant K-Ar ages 79-72 Ma.  K-Ar ages from propylitized pluton and gold-bearing veins and dikes that cut the pluton indicate episodes of alteration and quartz veining at 66 and 57 Ma.","AN002",430,"Anchorage","Ign",2460,"Kg"]
["Kum","Serpentinized ultramafic rocks","Late Cretaceous","Small, structurally bounded, pervasively sheared, discordant bodies of serpentinized ultramafic rocks wholly enclosed in pelitic schist (Jps) near Bald Mountain Ridge.",null,"Age of origin unknown, but early Late Cretaceous K-Ar minimum ages 91-89 Ma are presumed to date their emplacement.","AN002",440,"Anchorage","Ign",2510,"Kmum"]
["Tos","Sedimentary rocks of the Orca Group","Eocene and Paleocene","Monotonous sequences of thin- to thick-bedded sandstone, siltstone, and mudstone.  Primary sedimentary features indicate deposition by turbidity currents",null,null,"AN002",342,"Anchorage","Sed",950,"Tos"]
["Toc","Conglomerate of the Orca Group","Eocene and Paleocene","Massive, clast-supported pebble, cobble and boulder conglomerate to matrix-supported pebbly mudstone and sandstone; clasts generally are well rounded and consist entirely of sandstone and siltstone.  About 900 m thick near Miners Bay.",null,null,"AN002",343,"Anchorage","Sed",952,"Toc"]
["Tovs","Sedimentary and volcanic rocks of the Orca Group","Eocene and Paleocene","Basaltic flows, pillow breccia, and tuff interbedded with fyschoid siltstone and sadstone southeast of Miners Bay.  Volcanic interbeds weather a conspicuous rusty color.",null,null,"AN002",344,"Anchorage","Sed",951,"Tovs"]
["Kvs","Metasedimentary rocks of the Valdez Group","Late Cretaceous","Thick sequences of drab, rythmically alternating multiply deformed turbidites, including metasandstone, metasiltstone, argillite, slate, and phyllite, and rare beds of pebbly argillite and metasandstone;  generally beds are a few centimeters to a few met",null,null,"AN002",441,"Anchorage","Meta",2700,"Kvs"]
["Kvt","Mafic metatuff of the Valdez Group","Late Cretaceous","Altered chlorite-epidote-actinolite semischist interbedded with metasedimentary rocks in a small area near the divide between Coal Creek and Metal Creek.  Believed to represent aquagene tuff analogous to widespread thicker metavolcanic rocks in Cordova a",null,null,"AN002",442,"Anchorage","Sed",2705,"Kvv"]
["Mzm","McHugh Complex of the Valdez Group","Mesozoic","Strongly deformed, melange-like assemblage of diverse lithologies between Eagle River and Border Ranges faults.  Broad zones as wide as 1 km of intense shearing lack any stratal continuity and, in many places, are marked by angular, elongate phacoids, ei",null,null,"AN002",443,"Anchorage","Melange",2190,"Kmk"]
["Kt","Leucotonalite and trondhjemite","Early Cretaceous","Medium-grained plugs and elongate irregular-shaped, sill-like bodies of leucocratic plutonic rocks in northern Chugach Mountains in a zone about 5 km wide near Border Ranges fault.  Rocks are foliated and contain less than 10% mafic minerals including mu",null,"K-Ar on hornblende 126-124 Ma, biotite 116 MA, and muscovite 110 Ma, and a concordant U-Pb age of 103Ma.  Ar/Ar ages on hornblende 129,125, and 114 Ma, biotite 123 Ma, and muscovite 118 Ma, and two Rb/Sr isochrons 133 and 130 Ma.","AN002",450,"Anchorage","Ign",2570,"Ktt"]
["Jtr","Trondhjemite","Late Jurassic","Two discordant, NE-trending, elongate, epizonal, muscovite-biotite, leucocratic plutons intruding Jurassic quartz diorite (Jqd) and amphibolite (Jma) in Talkeetna Mountains.  Bodies are generally altered and sheared and have a faint foliation locally.",null,"K-Ar age from the northern pluton is 129 Ma and 2 K-Ar ages for hte southern pluton range from 134-142 Ma.  Four K-Ar ages from the northern pluton which extends in to the TK quad are tightly clustered from 143 to 149 Ma.","AN002",501,"Anchorage","Ign",3380,"Jtr"]
["Trl","Limestone and marble","Late Triassic","Unfossiliferous, massive to poorly bedded limestone near head of east fork of Kings River, and limestone lenses as much as 30 m thick in broad shear zones in the Talkeetna Formation along the Castle Mountain fault;  medium- to coarse-grained marble occur",null,null,"AN002",600,"Anchorage","Sed",4030,"JTrlm"]
["Qs","Surficial deposits","Quaternary","Glacial and alluvial deposits, chiefly unconcolidated gravel, sand, and clay",null,null,"TK002",200,"Talkeetna Mountains","Unconsol",100,"Qs"]
["Tv","Volcanics","Paleocene to Miocene","Over 1500 m of felsic to mafic subaerial volcanics and related shallow intrusives.  Small stocks, irregular dikes, lenticular flows, and thick layers of pyroclastic rocks; predominately consists of fine- to medium-grained, generally medium-gray quartz la",null,"K-Ar (3 samples) from andesite in the middle of the sequence","TK002",321,"Talkeetna Mountains","Ign",1000,"Tvu"]
["Tim","Hyabyssal Mafic Intrusives","Paleocene to Miocene","Small stocks and irregular dikes of diorite prophyry, diabase, and basalt.  Probably the subvolcanic equivalent of the andesite flows of unit Tv.",null,null,"TK002",350,"Talkeetna Mountains","Ign",1012,"Thm"]
["Tif","Hyabyssal Felsic Intrusives","Paleocene to Miocene","Small stocks and irregular dikes of rhyolite, quartz latite, and latite.   Probably correlative with the felsic subvolcanic equivalent of unit Tv.",null,null,"TK002",340,"Talkeetna Mountains","Ign",1011,"Thf"]
["Ttw","Tsadaka and Wishbone Fm Undivided","Miocene and (Paleocene to Eocene) respectively","The Tsadaka consists of cobble-boulder conglomerate with thin interbeds of sandstone, siltstone, and shale; about 200m thick.  The Wishbone Formation unconformably underlies the Tsadaka.  It comprises well-indurated fluvitile conglomerate with thick inte",null,null,"TK002",331,"Talkeetna Mountains","Sed",790,"Ttw"]
["Tc","Chickaloon Fm","Paleocene","Well-indurated, continental, dominately fluvatile sequence of massive feldspathic sandstone, siltstone, claystone, and conglomerate, containing numerous beds of bituminous coal; over 1500 m thick",null,null,"TK002",330,"Talkeetna Mountains","Sed",900,"Tch"]
["Tsu","Sedimentary, undifferentiated","Tertiary","Fluvatile conglomerate, sandstone, and claystone with a few interbeds of lignitic coal. Looks similar to the sedimentary rocks of the southern Talkeetna Mountains but lacks fossil evidence for definitive correlation.  The sequence is over 160 m thick.  I",null,null,"TK002",371,"Talkeetna Mountains","Sed",500,"Tsu"]
["Tgd","Granodiorite","Eocene","Contains hornblende and biotite.  Part of a small pluton along the northern edge of map area.",null,"K-Ar on biotite 48.8 +/- 1.5 m.y. and on hornblende 44.8 +/- 1.3 m.y.","TK002",370,"Talkeetna Mountains","Ign",1300,"Tegr"]
["Thgd","Biotite-Hornblende Granodiorite","Paleocene and Eocene","Granodiorite  predominates, but locally it grades into adamellite, tonalite, and quartz diorite.  All of these rocks are medium to dark gray, medium grained, generally structurless, and have granitic to seriate textures.  In all of them hornblende is the",null,"K-Ar age on biotite 58.6 and 54.8","TK002",341,"Talkeetna Mountains","Ign",1320,"Tpgr"]
["Tbgd","Biotite Granodiorite","Paleocene and Eocene","Biotite granodiorite and adamellite in about equal proportions.  These rocks are light to medium gray, medium- to coarse- grained, and have granitic to seriate textures.  Biotite is the chief mafic mineral.   Faint flow structures evident.  Plutons are s",null,"Considered to be the same age as Thgd.  K-Ar ages on biotite range from 56.3 to 58.6.","TK002",311,"Talkeetna Mountains","Ign",1320,"Tpgr"]
["Tsmg","Schist, migmitite, and granite","Paleocene","Undifferentiated terrane of andalusite and sillimanite-bearing schist, lit-par-lit type migmatite, and small granitic bodies with moderately to well-developed foliation.  Contacts generally gradational between these rocks as it is between the schist and",null,"K-Ar age on biotite of 58.7 m.y.","TK002",361,"Talkeetna Mountains","Meta",1720,"TKgg"]
["Tkt","Tonalite","Late Cretaceous and early Paleocene","Dominately biotite-hornblende tonalite, locally grades into quartz diorite.  The tonalite is medium gray, coarse to medium grained, has a granitic texture and a fairly well-developed primary foliation.",null,"K-Ar age ranges on biotite of  61.7 to 72m.y.  K-Ar ages on hornblende 61 to 74.4 m.y.","TK002",301,"Talkeetna Mountains","Ign",1660,"TKm"]
["TKa","Adamellite","Late Cretaceous and early Paleocene","Occurs in large epizonal plutons dominately adamellite but locally includes granodiorite.  Biotite is the chief mafic mineral.  Medium to coarse grained, medium to light gray,  textures ranges from granititic to serate.   The age dates indicate that this",null,"K-Ar age ranges on biotite of  65 m.y.  K-Ar ages on muscovite 67.2 m.y.","TK002",310,"Talkeetna Mountains","Ign",1655,"TKg"]
["TKgr","Granititic rocks undivided","Cretaceous and (or) Tertiary","Rocks of uncertain age occur in four smaller epizonal plutons of granodiorite and tonalite.  Color is medium to dark gray, grain size is medium, texture is granititic.  Mafic minerals are hornblende and biotite.",null,null,"TK002",300,"Talkeetna Mountains","Ign",1660,"TKm"]
["TKlg","Leucogabbro","Cretaceous and (or) Tertiary","Small poorly exposed intrusive of uncertain age essentially consisting of plagioclase and pale-green hornblende.  Medium to light gray, coarse to medium grained, with a granitic to seriate texture.",null,null,"TK002",320,"Talkeetna Mountains","Ign",1670,"TKgb"]
["Kar","Arkose Ridge Fm","Cretaceous (Eocene/Paleocene probably)","Arkosic sandstone, conglomerate, graywacke, siltstone, and shale.  Clasts consist chiefly of granitic and metamorphic rock frags, quartz, feldspar, and biotite.  Plant fragments indicate a terrestial origin.  The formation rests unconformably on Jurassic",null,"K-Ar on biotite yields an age of 67.5 m.y.","TK002",511,"Talkeetna Mountains","Sed",890,"Tar"]
["Km","Matanuska Fm","Cretaceous","Well-indurated shale, siltstone, sandstone, graywacke, with subordinate conglomerate interbeds; total thickness in excess of 1200 m.   Generally dark gray and thinly bedded, mostly marine depositional environment of moderate to shallow depths.   May corr","Plant frags",null,"TK002",500,"Talkeetna Mountains","Sed",2010,"Km"]
["Jn","Naknek Fm","Late Jurassic","Shallow marine, thin to thick bedded, intercalated strata of fossiliferous gray siltstone, shale, sandstone, and conglomerate; over 1400 m thick.   Correlates with the Root Glacier Fm of the southern Wrangell Mountains.",null,null,"TK002",421,"Talkeetna Mountains","Sed",3010,"Jn"]
["Jct","Chinitna Fm and Tuxedni Group (Middle Jurassic) undivided","Late Jurassic","The Chinitna is shallow marine, intercalated sequence of dark-gray shale, siltstone, and subordinate graywacke; contains numerous large limestone concretions; it is as much as 600 m thick.  The Tuxedni Group is shallow marine, well-indurated, thinly to t",null,null,"TK002",431,"Talkeetna Mountains","Sed",3140,"Jtxc"]
["Jtk","Talkeetna Fm","Early Jurassic","Andesitic flows, flow breccia, tuff, and agglomerate; subordinate interbeds of sandstone, siltstone, and limestone.  A dominately shallow marine sequence about 1000 to 2000 m thick",null,null,"TK002",411,"Talkeetna Mountains","Ign",3250,"JTrtk"]
["Jls","Limestone","Early Jurassic","Light to dark-gray, fine- to medium-grained unfossiliferous limestone; near granitic rocks recrystallized to marble.  Forms lenticular bodies, as much as 30 m thick, within the Talkeetna Fm.",null,null,"TK002",410,"Talkeetna Mountains","Sed",4031,"JTrlm"]
["Jtr","Trondhjemite","Late Jurassic","Forms discordant, NE trending epizonal pluton.  Large portions have been sheared and saussuritized.  Light gray, medium to coarse grained with granitic texture.  A faint flow foliation is lovally developed.  Major minerals include plagioclase, quartz, k-",null,"K-Ar ages on biotite range from 99.4 to 148.5; on muscovite they range from 129 to 146 m.y. One biotite age of 67.8 m.y. was probably reset by a more recent event","TK002",400,"Talkeetna Mountains","Ign",3380,"Jtr"]
["Jgd","Granodiorite","Middle to Late Jurassic","Dominately granodiorite but includes minor amounts of tonalite and quartz diorite.  Medium to dark gray, medium grained, and in undeEromed rocks have granitic texture.  Mafics includes biotite and hornblende.  Ne-trending secondary foliation is present i",null,"K-Ar ages on biotite range from 144 to 174; on hornblende range from 154 to 167.  A zircon age of 125 was also determined using fission track.","TK002",401,"Talkeetna Mountains","Ign",3402,"Jgd"]
["Jgdm","Migmatite border zone of Granodiorite","Middle to Late Jurassic","Forms a terrane of poorly exposed, intricately intermixed contact schist, amphibole, and small dikes and veinlets of granodiorite.",null,null,"TK002",470,"Talkeetna Mountains","Meta",3621,"PPast"]
["Jmrb","Marble","Middle to Late Jurassic metamorphic age","Contact metamorphosed marble bed more than 40 m thick within migmatitic border zone.    The rock is white, coarse to medium grained with prophyroblastic cystals of garnet and diopside.",null,null,"TK002",480,"Talkeetna Mountains","Meta",5955,"PPaskm"]
["Jqd","Quartz diorite","Middle to Early Jurassic","Dominately quartz diorite but also includes diorite and tonalite.  Large portions have been intensively sheared and altered.  Fresh rock is medium to dark greenish gray, medium to coarse grained, and has granitic texture.  Where altered, the quartz diori",null,null,"TK002",420,"Talkeetna Mountains","Ign",3403,"Jqd"]
["Jam","amphibolite","Middle to Early Jurassic metamorphic age","Dominately amphibolite but includes subordinate amounts of greenschist and fgoliated diorite.  Amphibolite is generally dark greenish gray, medium to coarse grained, but fine-grained varieties also occur.",null,"K-Ar age on hornblende of 176.6 m.y.","TK002",441,"Talkeetna Mountains","Meta",5550,"PPast"]
["Jmb","marble","Middle to Early Jurassic metamorphic age","White, medium- to coarse grained, massive interbeds within the amphibolite terrane of Jam.  Contains subordinate amounts of garnet and diopside.",null,null,"TK002",450,"Talkeetna Mountains","Meta",5955,"PPaskm"]
["Jgs","greenstone","Middle to Early Jurassic metamorphic age","Dark greenish gray, fine-grained, generally structurless rock.  Oringinal minerologiy was pyroxene, amphibole, and plagioclase which altered to chlorite, epidote, serpentine, calcite, and minor sericite and quartz.",null,null,"TK002",461,"Talkeetna Mountains","Meta",5641,"PPast"]
["Jpmu","Plutonic and metamorphic rocks, undifferentiated","Middle to Early Jurassic metamorphic age","Intermixed mosaic of most of the previously  discussed Jurassic  metamorphic and plutonic rocks (Jtr, Jgd, Jgdm, Jqd, Jgs, and Jps).  Two rock types, amphibolite and sheared quartz diorite, dominate the terrane.",null,null,"TK002",440,"Talkeetna Mountains","Meta",3600,"PPast"]
["Trv","Basaltic metavolcanic rocks","Late Triassic","Shallow water marine unit consists of amygdaloidal metabasalt flows with very subordinate amounts of thin interbeds of metachert, argillite, metavolcaniclastic rocks, and marble.  Minimum thickness of the unit is 800 m.  Metabasaltic flows are as much as",null,null,"TK002",360,"Talkeetna Mountains","Meta",4430,"Trn"]
["Pzv","Basaltic to andesitic metavolcanic rocks","Pennsylvanian (?) and Early Permian)","Rocks of this unit form an interlayered heterogeneous, dominately marine sequence over 5000 m thick.  Primarily consists of metamorphosed flows and tuffs of basaltic and andesitic compositions.  Mudstone, bioclastic marble, and dark-gray to black phyllit",null,null,"TK002",100,"Talkeetna Mountains","Meta",5630,"PPasc"]
["Pls","Marble","Pennsylvanian (?) and Early Permian ?)","Forms lenticular interbeds, as much as a few tens of meters thick, within basaltic to andesitic late Paleozoic metavolcanogenic sequence (Pzv).  Rock is light gray to white, medium to coarse grained, thick-bedded to massive marble.","Poorly preserved and generally unidentified crinoid columnals, brachipods, bryozoans, and rarely corals.",null,"TK002",101,"Talkeetna Mountains","Meta",5955,"PPaskm"]
["Js","Sedimentary and volcanic rocks, undivided","Late Jurassic","These rocks comprise a section of intercalated argillite and graywacke, pebble conglomerate, and flows and dikes of andesite to latitic feldspar porphyry.  The argillite and fine-grained graywacke are thinly to moderately thickly bedded and generally are","well-preserved fossils of Buchia rugosa from argillite indicating a Late Jurassic age.",null,"TK002",460,"Talkeetna Mountains","Sed",2850,"KJf"]
["Kag","Argillite and lithic graywacke","Early Cretaceous","These rocks occur in a monotous, intensely deformed flyschlike turbidite sequence, probably several thousand meters thick.  The rocks are highly indurated, and many are sheared and pervasively cleaved.  Most cleavage is axial plane cleavage.  The argilli","poorly preserved fossils of  Incoceramus sp.; a block of Buchia-bearing limestone was found in float.",null,"TK002",510,"Talkeetna Mountains","Sed",5210,"Mzpca"]
["Trvs","Metabasalt and slate","Late Triassic","Shallow marine, interbedded sequence of amygdaloidal metabasalt flows and slate.  Sequence is tightly folded along with Kag and slightly metamorphosed and unv\\evenly sheared.  The metabasalt is dark greenish gray, aphanitic, with numerous amygdules.  The","Monotis subcircularis and Heterorstridium sp. in argillite beds",null,"TK002",351,"Talkeetna Mountains","Meta",4450,"Trnm"]
["DSga","Graywacke, argillite, and shale","Silurian ? to Middle Devonian","This unit is poorly known.  The component rocks identifed are medium to dark gray, sheared and tightly folded with vertical dips, and occur intercalated in beds as much as 1 m thick.",null,null,"TK002",600,"Talkeetna Mountains","Sed",2192,"Kmar"]
["Jta","Crystal tuff, agillite, chert, graywacke and limestone","Jurassic","Shallow to moderately deep marine sequence, tightly folded and interally faulted, at least several thousand meters thick.  Tuff is light to dark gray, locally with a greenish tint and weathers to brown.  It is massive with obscure rhythmic laminations an",null,null,"TK002",451,"Talkeetna Mountains","Ign",3850,"JTrct"]
["Ksu","Sedimentary rocks, Undivided","Early Cretaceous","Shallow marine sequence of thinly bedded calcareous sandstone, siltstone, claystone, minor conglomerate, and thick-bedded to massive clastic limestone;  over 100m thick",null,null,"TK002",501,"Talkeetna Mountains","Sed",2100,"Knl"]
["CZum","Ultramafic and mafic rocks","Cambrian and/or Precambrian","Serpentinite and greenstone intruded by gabbro and diorite",null,null,"LG002",899,"Livengood","Ign",8250,"CZum"]
["CZwa","Wickersham unit--Maroon and green argillite","Early Cambrian and Late Proterozoic","Maroon and green argillite, phyllite, quartzite, graywacke, siltite, and phyllite.  Unit is characterized by the relative lack of grit except in the far western part of the quadrangle",null,null,"LG002",902,"Livengood","Meta",8310,"CZwa"]
["CZwa","Wickersham unit--Maroon and green argillite","Early Cambrian and Late Proterozoic","Maroon and green argillite, grit, quartzite, siltite, graywacke and phyllite--As mapped includes thin beds of dark limestone, which are probably equivalent to unit CZwl, as mapped in other areas, but which are areally restricted and are not mapped separa",null,null,"LG002",902,"Livengood","Meta",8310,"CZwa"]
["CZw","Wickersham unit--Grit","Early Cambrian and Late Proterozoic","Grit, quartzite, phyllite, and slate.  Differs from other grit units in that it contains chert. Includes limestone interbeds (l) that lithologically resemble subunit CZwl Livengood Area",null,null,"LG002",903,"Livengood","Meta",8300,"CZw"]
["CZwl","Wickersham unit--limestone","Early Cambrian and Late Proterozoic","Dark-gray arenaceous limestone",null,null,"LG002",901,"Livengood","Sed",8000,"CZwl"]
["CZwl","Wickersham unit--Dark limestone","Early Cambrian and Late Proterozoic","Sparsely or non-arenaceous limestone",null,null,"LG002",901,"Livengood","Sed",8000,"CZwl"]
["Dc","Cascaden Ridge unit","Middle Devonian","Shale, siltstone, sandstone, conglomerate, and minor limestone",null,null,"LG002",847,"Livengood","Sed",6940,"Dcb"]
["Dq","Quail unit","Late Devonian?","Conglomerate, phyllite, calc-phyllite, siltstone, and sandstone",null,null,"LG002",844,"Livengood","Sed",6920,"Dq"]
["DSl","Lost Creek unit","Devonian and Silurian","Limestone and varied sedimentary rocks",null,null,"LG002",850,"Livengood","Sed",6955,"Dlc"]
["Dsl","Schwatka unit--Limestone","Middle and Early Devonian","Limestone",null,null,"LG002",842,"Livengood","Sed",6945,"Ds"]
["DSt","Tolovana Limestone","Middle Devonian to Early? Silurian","Limestone and rare dolomite",null,null,"LG002",849,"Livengood","Sed",6965,"DSt"]
["Dsv","Schwatka unit--Mafic volcanic rocks","Middle and Early Devonian","Mafic volcanic rocks and minor clastic sedimentary rocks",null,null,"LG002",841,"Livengood","Ign",7010,"Dsv"]
["Ka","Alaskite","Late Cretaceous","Exposed at Raven Creek Hill",null,null,"LG002",410,"Livengood","Ign",2450,"Kg"]
["Kd","Dikes","Cretaceous?","Bodies ranging in composition from granite to diorite",null,null,"LG002",400,"Livengood","Ign",2400,"Kg"]
["Kg","Granite","Late Cretaceous","Pedro Dome and rocks in its vicinity",null,null,"LG002",430,"Livengood","Ign",2475,"Kg"]
["Kgd","Granodiorite","Late Cretaceous","Pedro Dome and rocks in its vicinity",null,null,"LG002",435,"Livengood","Ign",2480,"Kg"]
["KJv","Vrain unit","Early Cretaceous and/or Jurassic","Pyritiferous shale and minor siltstone.  Not flysch, thought by Tom Dutro to be equivalent to upper part of Glenn Shale.",null,null,"LG002",495,"Livengood","Sed",2860,"KJvr"]
["KJw","Wolverine unit","Early Cretaceous and/or Jurassic","Quartzite and interbedded shale and siltstone",null,null,"LG002",491,"Livengood","Sed",2815,"KJw"]
["Km","Minto unit","Late Cretaceous?","Siltstone, mudstone, graywacke, quartzose sandstone, and plant-fragment-bearing siltstone",null,null,"LG002",405,"Livengood","Sed",1980,"Kms"]
["Kmo","Quartz monzonite, monzonite, and syenite","Late Cretaceous","Comprises Sawtooth, Wolverine, Elephant Mountains, and Huron Creek plutons",null,null,"LG002",401,"Livengood","Ign",2470,"Kg"]
["Ks","Syenite","Late Cretaceous","Roy Creek stock",null,null,"LG002",420,"Livengood","Ign",2465,"Kg"]
["Kwcc","Wilber Creek flysch unit, coarse-grained","Early Cretaceous; Albian","Polymictic conglomerate, conglomeratic graywacke, and shale",null,null,"LG002",480,"Livengood","Sed",2115,"Kwcf"]
["Kwcs","Wilber Creek flysch unit, fine-grained","Early Cretaceous; Albian","Shale, siltstone, and graywacke",null,null,"LG002",480,"Livengood","Sed",2115,"Kwcf"]
["MzPzp","Phyllite, amphibolite, greenstone, and diorite","Mesozoic or Paleozoic","Phyllite, amphibolite, greenstone, and diorite",null,null,"LG002",795,"Livengood","Meta",5216,"KJvr?"]
["MzPzr","Raven Creek Hill unit","Mesozoic or Paleozoic","Metasedimentary gneiss, mica schist, phyllite, and hornfels",null,null,"LG002",791,"Livengood","Meta",5208,"TPza"]
["Ofs","Fossil Creek Volcanics--Shale","Ordovician","Shale, chert, and limestone intruded by gabbro",null,null,"LG002",860,"Livengood","Sed",7610,"Ofc"]
["Ofv","Fossil Creek Volcanics--Alkali basalt","Ordovician","Alkali basalt, agglomerate, and volcanoclastic conglomerate.",null,null,"LG002",860,"Livengood","Ign",7610,"Ofc"]
["Old","Livengood Dome Chert","Late Ordovician","Chert, siliceous slate with rare greenstone and limestone",null,null,"LG002",871,"Livengood","Meta",7710,"Och"]
["PDms","Metamorphic and sedimentary rocks","Permian to Devonian?","Black and greenish-gray siliceous slate, chert, siltstone, debris flows, and greenstone",null,null,"LG002",801,"Livengood","Meta",5615,"PDms"]
["PMs","Greenish-gray siliceous slate, quartzite, chert, and greenstone","Permian to Mississippian",null,null,null,"LG002",805,"Livengood","Meta",5600,"PDms"]
["Ps","Sedimentary rocks","Permian","Argillite, siltstone, sandstone, and minor conglomerate",null,null,"LG002",750,"Livengood","Sed",5740,"Ps"]
["Pzc","Chatanika unit","Paleozoic","Allochthonous, garnet-bearing quartz-biotite-muscovite schist, and quartzite.  Primarily epidote-amphibolite facies rocks, but also includes eclogitic rocks",null,null,"LG002",890,"Livengood","Meta",5510,"Pze"]
["PzZm","Mafic igneous rocks","Paleozoic and/or Late Proterozoic","Includes minor interlayered sedimentary rocks",null,null,"LG002",912,"Livengood","Ign",8450,"MzZum"]
["Qa","Alluvium","Holocene",null,null,null,"LG002",105,"Livengood","Unconsol",100,"Qs"]
["Qab","Abandoned or inactive flood plain deposits","Holocene","Includes natural levees on streams in the Minto Flats",null,null,"LG002",111,"Livengood","Unconsol",100,"Qs"]
["Qaf","Alluvial fan deposits","Holocene",null,null,null,"LG002",100,"Livengood","Unconsol",100,"Qs"]
["Qd","Sand dune deposits","Holocene",null,null,null,"LG002",120,"Livengood","Unconsol",100,"Qs"]
["Qg","Reworked creek gravels in placer mining areas","Holocene",null,null,null,"LG002",100,"Livengood","Unconsol",100,"Qpm"]
["Qlc","Loess and colluvium","Holocene","Includes minor upland alluvium",null,null,"LG002",100,"Livengood","Unconsol",100,"Qs"]
["Qs","Swamp deposits","Holocene",null,null,null,"LG002",113,"Livengood","Unconsol",100,"Qs"]
["Qsu","Reworked silt, undifferentiated, and organic deposits","Holocene","Includes swamp deposits",null,null,"LG002",113,"Livengood","Unconsol",100,"Qs"]
["QTg","Gravel, sand, and silt","Holocene to Pliocene","Poorly consolidated deposits",null,null,"LG002",285,"Livengood","Sed",100,"Qs"]
["SZa","Amy Creek unit","Silurian? to Late Proterozoic","Siliceous dolomite, chert, and basaltic greenstone, minor limestone, shale and siltstone",null,null,"LG002",911,"Livengood","Sed",6680,"SZa"]
["Tb","Olivine basalt","Tertiary",null,null,null,"LG002",230,"Livengood","Ign",1004,"Tb"]
["Tgp","Peraluminous granite","Paleocene","Cache Mountain pluton",null,null,"LG002",240,"Livengood","Ign",1320,"Tpgr"]
["TKg","Felsic granitic rocks","Tertiary and/or Cretaceous","Small intrusive bodies in the upper Wilber Creek area",null,null,"LG002",291,"Livengood","Ign",1655,"TKg"]
["TKg","Felsic granitic rocks","Tertiary and/or Cretaceous","Vault pluton",null,null,"LG002",291,"Livengood","Ign",1655,"TKg"]
["TKm","Monzonite","Tertiary and/or Cretaceous","Cascaden Ridge pluton",null,null,"LG002",295,"Livengood","Ign",1660,"TKm"]
["Tm","Monzonite(?) or Monzodiorite(?","Paleocene?","Northeast of Tolovana Hot Springs pluton",null,null,"LG002",255,"Livengood","Ign",1350,"Thgd"]
["Tqm","Quartz monzonite","Paleocene","Tolovana Hot Springs pluton",null,null,"LG002",251,"Livengood","Ign",1320,"Tpgr"]
["Trc","Black shale and chert","Triassic",null,null,null,"LG002",601,"Livengood","Sed",4110,"Trcs"]
["Trm","Mafic igneous rocks","Triassic?","Gabbro and diabase sills and dikes.",null,null,"LG002",610,"Livengood","Ign",4210,"Trn"]
["TrMrs","Rampart Group--Sedimentary rocks","Triassic to Mississippian","Argillite, chert, graywacke, shale, and limestone",null,null,"LG002",692,"Livengood","Sed",5020,"TrMts"]
["TrMrv","Rampart Group--Igneous rocks","Triassic to Mississippian","Intrusive and extrusive mafic igneous rocks, and a few intermixed sedimentary rocks",null,null,"LG002",691,"Livengood","Ign",5130,"JTrtmu"]
["Trs","Calcareous phosphatic shale and limestone","Triassic","Includes minor calcareous sandstone and granule conglomerate",null,null,"LG002",605,"Livengood","Sed",4080,"Trgl"]
["Tvs","Volcanic and sedimentary rocks, undivided","Oligocene and Eocene","Conglomerate, sandstone, shale, and basalt",null,null,"LG002",209,"Livengood","Sed",795,"Tvs"]
["Zf","Fairbanks schist unit--undivided","Late Proterozoic","Greenschist facies muscovite-chlorite schist, quartzite, and phyllite.  Locally, divided into:",null,null,"LG002",930,"Livengood","Meta",9320,"PzZyqs"]
["Zfc","Fairbanks schist unit--Cleary subunit","Late Proterozoic","Facies characterized by white felsic schist, micaceous quartzite, chloritic or actinolitic greenschist, greenstone, and marble",null,null,"LG002",940,"Livengood","Meta",9321,"PzZyqs"]
["Zwg","Grit","Late Proterozoic","Bimodal quartzite, gray and olive-gray greenschist-facies argillite.  Unit age is considered to be Hadrynian",null,null,"LG002",925,"Livengood","Meta",8410,"Zwg"]
["Qa","Alluvium","Quaternary","Gravel, sand, silt; gray or buff, uncolsolidated, well-stratified; mapped only in valleys of major streams.  Includes gravel, sand, and silt of low terraces",null,null,"BD002",100,"Big Delta","Unconsol",100,"Qs"]
["Qac","Alluvium and colluvium","Quaternary","Boulders, gravel, sand, silt, and angular rock fragments.  In large river valleys contains much perennially frozen organic silt and peat.",null,null,"BD002",101,"Big Delta","Unconsol",100,"Qs"]
["Ql","Loess","Quaternary","Silt, eolian; light brown to brownish gray, unconsolidated, well-sorted, massive to poorly stratified; locally mottled by iron stains.  In places contains venefacts.  Thickness ranges from 1 to 50 m.",null,null,"BD002",110,"Big Delta","Unconsol",100,"Qs"]
["Qs","Sand","Quaternary","Sand, eolian; yellowish brown to grayish orange, light gray and olive gray, unconsolidated, forms dunes as much as 21 m high and dune fields 1 or more square kilometers in area.  Sand is commonly overlain by as much as 1 m of loess.",null,null,"BD002",111,"Big Delta","Unconsol",100,"Qs"]
["Qsp","Silt and peat","Quaternary","Organic silt deposited in swamps, black or mottled gray and brown.  Mostly perennially frozen.  Only the large areas of this unit in the vicinity of the Tanana valley are mapped",null,null,"BD002",120,"Big Delta","Unconsol",100,"Qs"]
["Qab","Abandoned floodplain alluvium","Quaternary","Unconsolidated silt, sand, pebbles, and cobbles, in well-stratified layers and lenses.  Light to dark gray and buff to brown; includes much organic material and grades into swamp deposits in poorly drained ares.",null,null,"BD002",121,"Big Delta","Unconsol",100,"Qs"]
["Qf","Fan deposits","Quaternary","Sand, gravel, and cobbles, in fairly well-stratified layers and lenses.  Primarily distal segments of  undifferientiated glacial outwash fans, mantled with loess.",null,null,"BD002",130,"Big Delta","Unconsol",100,"Qs"]
["Qm","Moraine deposits","Quaternary","Boulders, gravel, sand, and silty sand, in terminal moraine, lateral moraine, moraine in cirques, and ground moraine of several different ice advances.",null,null,"BD002",131,"Big Delta","Unconsol",100,"Qs"]
["Qdo","Outwash of Donnelly glaciation","Quaternary","Gravel and sandy gravel, light yellowish-brown to gray, moderately to well-rounded, in unconsolidated well-stratified layers and lenses",null,null,"BD002",140,"Big Delta","Unconsol",100,"Qs"]
["Qdlm","Morainal deposits of Delta glaciation","Quaternary","Till, sandy, yellowish-gray to light reddish-brown, unconsolidated, unstratified.  Gravel is angular to well-rounded, 2 cm to 24 cm in diameter",null,null,"BD002",141,"Big Delta","Unconsol",100,"Qs"]
["Qdlo","Outwash of Delta glaciation","Quaternary","Gravel silty or sandy, with lenses of well-sorted sand; light yellowish -brown.  Gravel well-rounded, poorly to moderately well-sorted in unconsolidated moderately well-stratified layers",null,null,"BD002",150,"Big Delta","Unconsol",100,"Qs"]
["Tn","Nenana gravel","Tertiary","Conglomerate and minor amounts of sandstone; yellowish-gray to reddish-brown, poorly consolidated, well-sorted.  Conglomerate particles, mostly well-rounded, up to 8 cm in diameter, characteristically iron-stained.",null,null,"BD002",200,"Big Delta","Sed",570,"Tn"]
["Tcb","Coal-bearing formation","Tertiary","Sandstone, siltstone, claystone, and conglomerate, light-yellowish-gray to light-reddish-brown, poorly consolidated, easily eroded.  Conglomerate particles mostly well-rounded quartz and chert as much as 4 cm in diameter.  Lignitic coal layers as much as",null,null,"BD002",201,"Big Delta","Sed",640,"Tcb"]
["Tcs","Conglomerate, Sandstone, Siltstone, Shale","Tertiary","Light gray, poorly consolidated, poorly bedded.  Conglomerate clasts are well-rounded to fairly angular and extremely variable in size ranging from granules to 1 m boulders of several types of granitic rock, gneiss, white quartz, and rarely schist.  Sand",null,null,"BD002",210,"Big Delta","Sed",500,"Tsu"]
["Tg","Granitic rocks","Tertiary","Quartz monzonite to granite; medium to coarse grained; equigranular to porphyritic; massive without linear or planar fabric or microfabric; commonly weathered and crumbly.  Only plutons with Tertiary K-Ar dates are included in this unit.  Plutons that ma",null,null,"BD002",211,"Big Delta","Ign",1320,"Tpgr"]
["Tf","Felsic igneous rocks","Tertiary","Lava, shallow, intrusives and dikes and sills.  Lava in eastern part of quad, gray with smokey quartz, sanidine, plagioclase, biotite, and hornblende phenocrysts.  Phenocrysts may be as long as 2 - 5 mm.  Some are 10 mm long.  Rock generally fractured an",null,null,"BD002",220,"Big Delta","Ign",1011,"Thf"]
["TKg","Granodiorite to Quartz Monzonite","Tertiary and Cretaceous","Medium grained; equigranular to porphyritic; massive without linear or planar fabric.  The rocks contain biotite, hornblende, muscovite, with biotite the most common mafic mineral.  The rocks in this unit are not  radiometrically dated",null,null,"BD002",221,"Big Delta","Ign",1655,"TKg"]
["Kg","Granodiorite to Quartz Monzonite","Cretaceous","Medium to coarse grained; mostly equigranular; massive without linear or planar fabric.  The rocks contain biotite is the most common mafic mineral; hornblende is less common.",null,"K-Ar ages are Cretaceous","BD002",300,"Big Delta","Ign",2480,"Kg"]
["Kd","Diorite and Gabbro","Cretaceous","Diorite medium gray, medium grained; dominately pyroxene, biotite and plagioclase; amphibole may be absent; in places quartz diorite; locally may be gabbro; generally massive.  Unit also includes undated dike and lenslike mass of dark-greenish gray, medi",null,null,"BD002",301,"Big Delta","Ign",2440,"Kmum"]
["Kp","Quartz-Orthoclase Porphyry","Cretaceous","Pink to tan weathering.  Quartz and Carlsbad-twinned orthoclase occur as large as 1 cm; euhedral phenocrysts in aphanitic to fine-grained groundmass; sericitzed.",null,"K-Ar on potassium feldspar","BD002",310,"Big Delta","Ign",2450,"Kg"]
["Pgc","Greenstone and Chert","Permian","Greenstone is light to dark green or greenish gray, greenish red, or greenish black; fine to coarse grained;  mostly massive with weakly developed foliation in places.  Chert is green, light, and dark gray, red, and mottled green and gray; massive, close","Radiolarians and conodonts in red chert",null,"BD002",400,"Big Delta","Sed",5830,"JPzsgs"]
["Pu","Periodotite, partly serpentinized","Paleozoic","Dark green to black; weathers a reddish orange brown; massive.  Diabase and diorite inclusions, commonly meters in diameter. A zone of quartz and magnesite, with some dolomite, 1 to 50 m thick. The silica-carbonate rock is bright orange, orange brown, or",null,null,"BD002",401,"Big Delta","Ign",5980,"JPsu"]
["Pq","Quartzite with some Phyllite, Micaceous Quartzite, Marble, and Calc. Qtz. Schist","Permian","Quartzite and lesser phyllite, micaceous quartzite, marble, and calcareous quartz schist.  Quartzite is tan, red, maroon to purple, and black and commonly  finely banded.  Mostly fine-grained and in places closely folded.  Locally has abundant, fine, dis",null,null,"BD002",410,"Big Delta","Meta",5960,"JPzsgs"]
["Pzc","Cataclastic rocks","Paleozoic","Mostly mylonite schist and mylonite gneiss; gray, light green and tan; fine to coarse grained; dense and hard to soft  and crumbly; fluxion structure common; neomineralization and crystalization evident.  Rocks mostly quartzitic and feldspathic with mino",null,null,"BD002",411,"Big Delta","Meta",5605,"MDtm"]
["Pzsg","Semischist, greenschist, quartzite, phyllite, marble, and greenstone","Paleozoic","Semischist or sheared grit; greenish gray or gray and fine to coarse grained; very quartzitic to very feldspathic; clear, gray, or bluish-gray quartz graine 1 to 5 mm in diameter characteristic; interlayered with quartz-chlorite mica schist and others co",null,null,"BD002",420,"Big Delta","Meta",6510,"MDt"]
["Pzq","Quartzite, Meta-Argillite, Phyllite, Slate, and Marble","Paleozoic","Quartzite commonly black but varies widely in color.  Locally, color changes due to contact metamorphism.  Interlayered with black or dark-gray meta-argillite.  Phyllite, marble, and quartzite more commonly occur in the upper part of the formation but ma",null,null,"BD002",421,"Big Delta","Meta",5660,"Pzk"]
["Pzm","Calcareous Phyllite, Marble and Phyllite","Paleozoic","Light to medium gray, fine to medium grained, thin layered and well foliated, commonly crumbly.  Characteristically cut by abundant carbonate-quartz veins and veinlets; locally forms low tors.  Age unknown, but stratigraphic relationships suggest early P",null,null,"BD002",430,"Big Delta","Meta",5662,"Pzkcp"]
["Pzs","Schist","Paleozoic","Quartz-mica schist with marble and quartzite, calcareous diopside schist, quartz-feldspar rock; and amphibole.  Sillimanite is locally abundant near the Salcha River and staurolite, andalusite and kyanite also occur.",null,null,"BD002",431,"Big Delta","Meta",8630,"PzZysa"]
["Pzg","Gneiss","Paleozoic","Gray and weathers tan; locally orange brown where altered; mostly medium grained equigranular; respresentative mineralogy is strained quartz, plagioclase, potassium feldspar, red-brown biotite and sillimanite; garnet, tourmaline, zircon, and apatite are",null,null,"BD002",440,"Big Delta","Meta",5670,"PzZyg"]
["Pzu","Ultramafic rocks","Paleozoic","Light green, greenish gray, or black and less commonly tan, brown, or yellow green; Occurs as small foliated masses infolded with amphibolite facies gneiss and schist.  Original rock was peridotite which has been regionally metamorphosed to amphibole, ch",null,null,"BD002",441,"Big Delta","Meta",5690,"MzZum"]
["Pzd","Diorite","Paleozoic","Medium gray to medium dark gray, fine to medium grained; dark-green to pale-brown hornblende, red-brown biotite abundant in some localities; foliation well-developed locally.",null,null,"BD002",450,"Big Delta","Ign",5440,"MzPzi"]
["PzpCsq","Schist and Quartzite","Paleozoic or Precambrian","Quartz-muscovite-biotite schist, quartz-muscovite schist, quartzite, and amphibole schist; locally garnetiferous.  Upper greenschist to lower amphibolite facies.  Age unknown.  Unit subdivided on published OFR98-133 into PzZysa and PzZysq.",null,null,"BD002",451,"Big Delta","Meta",9327,"PzZyqs"]
["PzpCs","Quartzite  and Schist","Paleozoic or Precambrian","Quartzite, feldspathic quartzite and quartz-mica schist, medium light gray to medium gray.  Quartzite, some shows original bedding, dominates the section.  Quartz-biotie schist is commonly; most of the unit is garnetiferous; Upper greenschist to lower am",null,null,"BD002",460,"Big Delta","Meta",9327,"PzZyqs"]
["PzpCa","Augen Gneiss","Paleozoic or Precambrian","Augen most commonly of white potassium feldspar, range in size from 1 to 10 cm long, most about 4 cm long.  Biotite is scarce to abundant.  Foliation layers containing biotite bend around augen.  Age unknown.",null,null,"BD002",461,"Big Delta","Meta",6521,"MDyao"]
["PzpCg","Gneiss and Quartzite","Paleozoic or Precambrian","Coarse to fine grained gneiss and quartzite; well foliated and banded to massive without banding; locally cataclastic;  ranges from peltic with abundant sillimanite to gneisses of probable igneous origin.  All rocks are well foliated, and dominant foliat",null,null,"BD002",470,"Big Delta","Meta",8802,"PzZypg"]
["Qa","Flood-plain alluvium","Quaternary","Well-stratified layers and lenses of unconsolidated gray silt, sand, pebbles, cobbles, and boulders;  occurs in two facies 1) gravelly facies 2)  silt and sand facies.  Both occur on the Tanana River east of the mouth of the Chena and on other streams in",null,null,"FB002",100,"Fairbanks","Unconsol",100,"Qs"]
["Qs","Swamp deposits","Quaternary","Dark-brown to black peat and silt more than 5 feet thick in some areas.  Perenially frozen and contain lenses and veinlets of clear ice.",null,null,"FB002",101,"Fairbanks","Unconsol",100,"Qs"]
["Ql","Landslide debris","Quaternary","Chaotic masses of angular fragments of shale, sandstone, and conglomerate, clay, sand, gravel, and schist  embedded in a matrix of silt, clay, and gravel.",null,null,"FB002",102,"Fairbanks","Unconsol",100,"Qs"]
["Qg","Reworked creek gravel","Quaternary","Placer-mine dredge tailings derived from buried creek gravels.",null,null,"FB002",103,"Fairbanks","Unconsol",100,"Qs"]
["Qbc","Basaltic cinders","Quaternary","Cinder cone from late Pleistocene or Recent eruption at north base of mountain southwest of Buzzard Creek.  Unconsolidated poorly sorted aggregate of irregular to subrounded fragments of scoriaceous to dense basalt.",null,null,"FB002",104,"Fairbanks","Unconsol",320,"Qcs"]
["Qab","Abandoned flood-plain alluvium","Quaternary","Well-stratifed layers and lenses of unconsolidated gray silt, sand, pebbles, cobbles, and boulders.  Occurs in two facies: 1)  coarse gravelly alluvium and 2) silty alluvium containing 95% silt and 5% sand.",null,null,"FB002",105,"Fairbanks","Unconsol",100,"Qs"]
["Qaf","Alluvial fan deposits","Quaternary","Well-stratified layers and lenses of gray to brown coarse and and pebble, cobble, and boulder gravel.",null,null,"FB002",106,"Fairbanks","Unconsol",100,"Qs"]
["Qdr","Dune Sand, reworked","Quaternary","Organic silty sand underlying undrained depressions and old lake or pond beds; derived from near by sand dunes.  Permafrost and considerable ground ice probably present at shallow depths.",null,null,"FB002",107,"Fairbanks","Unconsol",100,"Qs"]
["Qrm","Morainal deposits of Riley Creek Glaciation","Quaternary","Unsorted and unstratified glacial till with silt cover 1/2 foot thick.  Silt, sand, and gravel containing boulders more than 3 feet in diameter.  Coarse fragments angular to rounded.  Permafrost present, ice content low to moderate.",null,null,"FB002",108,"Fairbanks","Unconsol",100,"Qs"]
["Qro","Outwash of Riley Creek Glaciation","Quaternary","Well-stratified well-sorted porous and very permeable gray to pale yellowish brown sandy gravel containing lenses of coarse well-sorted sand.",null,null,"FB002",109,"Fairbanks","Unconsol",100,"Qs"]
["Qtf","Torrential fan deposits","Quaternary","Interfingering cobble and pebble gravel, mudflow deposits, and minor amounts of silt and sand, bordering the foothills.  Average coarseness decreases away from foothills.",null,null,"FB002",110,"Fairbanks","Unconsol",100,"Qs"]
["Qf","Fairbanks loess","Quaternary","Massive, homogeneous eolian silt on upper slopes and hilltops.  Well sorted, less than 10 % clay; grains angular, consist mostly of quartz, feldspar, and mica.  Locally cemented by iron oxide, locally calcareous.  Thickness ranges form 3 to 200 feet.  Co",null,null,"FB002",111,"Fairbanks","Unconsol",100,"Qs"]
["Qsu","Perennially frozen silt, undifferentiated","Quaternary","Massive, homogeneous unconsolidated, well-sorted silt of eolian origin containg less than 10% clay, locally rich in organic silt and larger organic fragments.  Inorganic components are angular grains of quartz, feldspar, and mica, locally cemented by iro","Large quantites of plant and animal remains",null,"FB002",112,"Fairbanks","Unconsol",100,"Qs"]
["Qd","Dune sand","Quaternary","Well-sorted angular to round, moderate yellowish-brown eolian sand consisting of yellowish-white, clear to opaque quartz grains (65 to 85%) but including some dark-gray to black rock fragments.",null,null,"FB002",113,"Fairbanks","Unconsol",100,"Qs"]
["Qhm","Morainal deposits of Healy Glaciation","Quaternary","Unstratified glacial till with silt cover 1/2 foot to 3 feet thick.  Silt, sand, and gravel with boulders more than 3 feet in diameter.  Coarse fragments angular to rounded.",null,null,"FB002",114,"Fairbanks","Unconsol",100,"Qs"]
["Qho","Outwash of the Healy Glaciation","Quaternary","Coarse, clean, well-sorted, well-stratified gray to yellowish-brown porous and very permeable gravel with layers and lenses of coarse clean sand.",null,null,"FB002",115,"Fairbanks","Unconsol",100,"Qs"]
["Qha","Alluvial fan deposits contemporaneous with Healy Glaciation","Quaternary","On the Dry Creek fan these deposits consist of well-stratified gray to brown pebble, cobble, and boulder gravel with layers and lenses of coarse sand, and range from fine clean gravel with pebbles 1/2 inch to 3 inches in diameter at the north end of fan",null,null,"FB002",116,"Fairbanks","Unconsol",100,"Qs"]
["Qdm","Morainal deposits of Dry Creek Glaciation","Quaternary","Mapped from aerial photos based on topographic expression.  Probably similar to morainal deposits of Healy Glaciation but somewhat more weathered and eroded.",null,null,"FB002",117,"Fairbanks","Unconsol",100,"Qs"]
["Qdo","Outwash of Dry Creek Glaciation","Quaternary","Similar to outwash of Healy Glaciation on same stream but more weathered and eroded, and overlain by thicker deposit of windblown silt.",null,null,"FB002",118,"Fairbanks","Unconsol",100,"Qs"]
["Qda","Alluvial fan deposits contemporaneous with Dry Creek Glaciation","Quaternary","Similar to alluvial fan deposits of Healy Glaciation on same stream but more weathered and eroded, and overlain by thicker deposit of windblown silt.",null,null,"FB002",119,"Fairbanks","Unconsol",100,"Qs"]
["Qbm","Morainal deposists of Browne Glaciation","Quaternary","Coarse sand and gravel, with abundant blocks of granite, gabbro, and conglomerate several feet on a side.  Small areas at an altitude of 2200 feet west of  Windy Creek and 5000 feet southeast of Gold King Creek consist  largely of boulders and blocks.  I",null,null,"FB002",120,"Fairbanks","Unconsol",100,"Qs"]
["Tn","Nenana Gravel","Tertiary","Buff to reddish-brown poorly consolidated pebble to boulder conglomerate and coarse sandstone, with interbedded mudflow deposits, thin claystone layers and local thin lignite beds.  Maximum thickness is 2000 feet.",null,null,"FB002",200,"Fairbanks","Sed",570,"Tn"]
["Tcb","Coal-bearing formation","Tertiary, Miocene? to Eocene?","Poorly consolidated, readily eroded pebbly sandstone, claystone, and subituminous coal, in synclinal basins in the foothills of  the Alaska Range between Nenana River and Dry Creek.  Pinches out northward and is overlapped unconformably by Nenana Gravel.",null,null,"FB002",210,"Fairbanks","Sed",640,"Tcb"]
["Mt","Totatlanika Schist","Mississippian","Predominately quartz-microcline-sericite schist and augen gneiss, gray in color, consisting of a coarse facies having large deformed phenocrysts of microcline, quartz and rare albite 0.1-1 inch in diameter; interbedded with a fine facies consisting of an","Syringopora",null,"FB002",300,"Fairbanks","Meta",6510,"MDt"]
["DSt","Tolovana (?) Limestone","Middle Silurian to Middle or early Late Devonian","Thick-bedded to massive, fine-crystalline to lithographic, medium dark bluish-gray limestone of unknown thickness.  Weathers buff to yellowish-brown.  Chert rare or absent.  Correlated on basis of lithology and geographic trend.",null,null,"FB002",400,"Fairbanks","Sed",6965,"DSt"]
["nc","Nilkoka Group- Chert and siliceous shale","Uncertain but believe to be Precambrian or early Paleozoic","Chert is hard, thin bedded to blocky, locally cut by shear planes, medium light gray or rarely nearly white or black with thin color layering; commonly stained yellow or red by iron oxide from weathering; forms reddish soil.  Interbedded siliceous shale","correlated to Mertie's (1937) unit B on basis of fossils (Cambrian or Ordovican)",null,"FB002",500,"Fairbanks","Sed",7710,"Och"]
["ng","Nilkoka Group-  Grit, argillite, quartzite, and limestone","Uncertain but believe to be Precambrian or early Paleozoic","Interbedded grit and varigated clay slate, quartzite, and phyllite, with rare siltstone beds and a few fine-grained lenticular limestone beds as much as 5 feet thick.  Color of fine-grained rocks predominately green but mottled by red through pale olive",null,null,"FB002",501,"Fairbanks","Meta",8310,"CZwa"]
["bc","Birch Creek Schist","Uncertain but believe to be early  Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",9327,"PzZyqs"]
["Mzi","Intrusive rocks","Probably Mesozoic but may be early Tertiary","Dikes and stocks of granite, granodiorite, dacite, and granite porhyry, intruded into schist formations of the Yukon-Tanana uplands and the Alaska Range.  Unconformably overlain by the coal-bearing formation (unit Tcb).",null,null,"FB002",700,"Fairbanks","Ign",1655,"TKg"]
["Dmu","Mafic and Ultramafic rocks","Devonian (?)","Ophitic diorite and serpentinized periodotite make up the Wood River Buttes.  Ore minerals constitute about 5% of the diorite.  Wood RIver Buttes are on a projection with mafic and ultramafic rocks in the Big Delta quad.  There is an intense linear posit",null,null,"FB002",800,"Fairbanks","Ign",5980,"JPsu"]
["Tb","Basalt",null,"Dark-gray and black or brownish oline basalt, closely jointed and deeply weathered with local pillow or columnar structure;  on lower slope  of hills near Fort Wainwright.",null,null,"FB002",900,"Fairbanks","Ign",1004,"Tb"]
["Qt4","Till, Cirque glaciation","Quaternary?","Unsorted boulder to clay-size  particles.  Moraine forms locally present, restricted to cirques",null,null,"TN002",130,"Tanana","Unconsol",100,"Qs"]
["Qt3","Till","Quaternary","Unsorted boulder to clay-size particles, includes long low lateral moraine on Halu Creek",null,null,"TN002",136,"Tanana","Unconsol",100,"Qs"]
["Qt2","Till","Quaternary","Unsorted boulder to clay-size particles, lowest moraine on Halu Creek",null,null,"TN002",137,"Tanana","Unconsol",100,"Qs"]
["Qt1","Till","Quaternary?","Unsorted boulder to clay-size particles, farthest down valley moraine on lower Halu Creek.",null,null,"TN002",138,"Tanana","Unconsol",100,"Qs"]
["Qt","Till, undifferentiated","Quaternary","Unsorted boulder to clay-size particles, no clear morainic forms.",null,null,"TN002",135,"Tanana","Unconsol",100,"Qs"]
["Qal","Recent alluvium","Holocene","Sandy gravel and sandy silt, forms flood plain of modern rivers and streams.",null,null,"TN002",105,"Tanana","Unconsol",100,"Qs"]
["Qaf","Alluvial fan deposits","Quaternary","Gravel, silt, and sand, commonly occur at mouth of small side canyons.  Includes some colluvial deposits.",null,null,"TN002",106,"Tanana","Unconsol",100,"Qs"]
["Qbg","Low-level bench gravel of Minook Creek","Quaternary","Gravel and sand on bench along lower parts of Minook and Hunter Creeks",null,null,"TN002",109,"Tanana","Unconsol",100,"Qs"]
["Qtr","Terrace deposits","Quaternary","Gravel, silt, and sand near mouth of Fleshlanana Creek",null,null,"TN002",110,"Tanana","Unconsol",100,"Qs"]
["Qags","Older alluvium","Quaternary","Coarse, silty sand and fine gravel; generally forms terrace sloping up and away from floodplains of streams and rivers",null,null,"TN002",111,"Tanana","Unconsol",100,"Qs"]
["QTg","High-level gravel","late Tertiary or early Quaternary","Well packed gravel, caps hills in vicinity of Rampart",null,null,"TN002",285,"Tanana","Unconsol",100,"Qs"]
["Qcal","Colluvium and alluvium, undifferentiated","Quaternary","Silt and sand mantling broad, flat valleys",null,null,"TN002",100,"Tanana","Unconsol",100,"Qs"]
["Qrs","Recent slide and slump deposits","Holocene","Very fresh, unmodified slumps and earthflows (Occurred about 1940).",null,null,"TN002",158,"Tanana","Unconsol",100,"Qs"]
["Qls","Older landslide deposits","Quaternary","Slumps and earth and rock slides",null,null,"TN002",108,"Tanana","Unconsol",100,"Qs"]
["Qc","Colluvium, undifferentiated","Quaternary","Predominantly silt, with some sand and gravel.",null,null,"TN002",107,"Tanana","Unconsol",100,"Qs"]
["Qta","Talus","Quaternary","Angular boulder rubble in cirque.",null,null,"TN002",159,"Tanana","Unconsol",100,"Qs"]
["Ql","Loess","Quaternary","Well-sorted silt",null,null,"TN002",121,"Tanana","Unconsol",100,"Qs"]
["Qess","Sand and silt","Quaternary","Well-sorted sand, commonly in subdued dune forms",null,null,"TN002",120,"Tanana","Unconsol",100,"Qs"]
["Qb","Rock-defended terraces on Minook Creek","Quaternary","Erosional benches along east side Minook Creek",null,null,"TN002",160,"Tanana","Unknown",100,"Qs"]
["Qat","Altiplanation terrace","Quaternary","Flat, even surface, formed on bedrock hilltops generally above 600 m",null,null,"TN002",161,"Tanana","Unknown",100,"Qs"]
["QTa","Andesitic lava","Late Tertiary or early Quaternary","Light to very ligry-gray vesicular lava.  Removed from final map",null,null,"TN002",451,"Tanana","Ign",451,"QTa"]
["Tvs","Rhyolitic volcanic and sedimentary rocks","Tertiary?","Rhyolitic lava and breccia.  Tuff and welded tuff common.  Cherty rocks minor, thin-bedded or in nodules.",null,null,"TN002",1001,"Tanana","Ign",1001,"Trs"]
["Ts","Sedimentary rocks","early Tertiary and Miocene","Interbedded polymictic pebble-cobble-boulder conglomerate, grit, and sandstone, with siltstone, shale, and lignite.",null,null,"TN002",640,"Tanana","Sed",640,"Tcb"]
["TKv","Volcanic rocks","Late Cretaceous and Early Tertiary","Dacite flows, may include tuff and andesite.",null,null,"TN002",1604,"Tanana","Ign",1604,"TKvd"]
["KJcs","Clastic sedimentary rocks","Late Jurassic and Cretaceous","Graywacke sandstone, quartzitic sandstone, quartzite, siltstone, shale, slate, slaty argillite, and polymictic conglomerate.",null,null,"TN002",2815,"Tanana","Sed",2105,"Kvgm"]
["JMms","Mafic and sedimentary rocks","Jurassic? to Mississippian","Rampart Group volcanic and sedimentary rock sequence",null,null,"TN002",5131,"Tanana","Ign",5131,"TrMtsu"]
["Ps","Slaty shale, siltstone, graywacke, and conglomerate","Permian","Moderately well-indurated, medium- to dark-gray shale, commonly weakly foliated to slaty, and in part phyllitic.  Well indurated, medium- to medium-drak-gray siltstone, in part argillite.",null,null,"TN002",5740,"Tanana","Sed",5012,"TrPs"]
["Pzar","Argillaceous rocks","Permian or Middle to Late Devonian","Thin-bedded siltstone, slate, and phyllite, thick-bedded argillite, and minor laminated sandstone.  Metamorphosed to low grade.  Not on published OFR98-133",null,null,"TN002",5615,"Tanana","Sed",5615,"PDms"]
["Pzc","Calcareous clastic rocks","early Paleozoic, possibly Devonian","Medium-gray siltstone and very fine-grained sandstone, largely calcareous and generally schistose.  Not on OFR98-133",null,null,"TN002",6921,"Tanana","Meta",6921,"Dq?"]
["Pzw","Quartz wacke","early Paleozoic, possibly Devonian","Poorly sorted sandstone, granule conglomerate, siltstone, and semischist.  Not on OFR98-133",null,null,"TN002",6922,"Tanana","Meta",6922,"Dq2?"]
["Pzsr","Schistose rocks","middle Paleozoic?","Chiefly white, light- to medium-gray, silvery gray, and brownish gray, fine- to coarse-grained quartz-mica-grarnet schist.  Unit apparently conformable with unit Pzl, but contact is poorly exposed.",null,null,"TN002",5208,"Tanana","Meta",5208,"TPza"]
["Pzl","Limestone, greenstone, and schist","Ordovician(?), Silurian, and Devonian","Dominantly light- to light-medium-gray partly dolomitic limestone and dolomite.  Basaltic greenstone and partly calcareous chloritic schist are associated sequentially or interbedded with the carbonate rocks",null,null,"TN002",6966,"Tanana","Meta",6966,"DSt?"]
["Pzvs","Volcanic and sedimentary rocks","Ordovician or Silurian","Partly altered mafic lava and tuff, slate, slaty shale, phyllite, tuffaceous limestone, cherty schist, and chert.  Not on OFR98-133",null,null,"TN002",6910,"Tanana","Meta",6910,"Dtr"]
["Pzl","Limestone, dolomite, greenstone, and schist","Silurian or Devonian","Limestone, dolomitic limestone, partly silicified dolomite, basaltic greenstone, and chloritic schist.  Similar to unit Pzl south of Yukon River.",null,null,"TN002",6956,"Tanana","Meta",6956,"DSls?"]
["Oc","Chert","Late(?) Ordovician","Light- to medium-gray chert.",null,null,"TN002",7710,"Tanana","Meta",7710,"Och"]
["Cal","Argillite, slate, quartzite and grit","probably Cambrian, possibly in part preCambrian","Medium- to dark-red or maroon, light- to medium-green and grayish-green, and medium-gray argillite and slate.  Light yellow-brown to light-gray quartzite and grit.  Not on OFR98-133",null,null,"TN002",8410,"Tanana","Meta",8310,"CZwa"]
["PzpCsq","Schist, quartzite, phyllite, and slate","early Paleozoic(?) and preCambrian(?)","Light- to medium-gray and silvery gray quartz-mica schist, light- to medium-gray quartzite, light- to dark-gray slate and phyllite.  Not on OFR98-133",null,null,"TN002",8630,"Tanana","Meta",8630,"PzZysa"]
["Tg","Granite","early Tertiary","Light-gray biotite granite, only at Manley Hot Springs",null,"K-Ar(?) 62 Ma","TN002",2470,"Tanana","Ign",1320,"Tpgr"]
["TKq","Quartz monzonite","Early Tertiary-Late Cretaceous","Light- to vey light-gray quartz monzonite, may range to granite",null,"K-Ar(?) 61.8 Ma","TN002",1655,"Tanana","Ign",1655,"TKg"]
["Kg","Granitic rocks","Late Cretaceous","Quartz monzonite, granite, monzonite, and possibly granodiorite",null,"K-Ar(?) 92, and 90 Ma; 104 Ma","TN002",2470,"Tanana","Ign",2470,"Kg"]
["Km","Mafic rocks","Cretaceous?","Gabbro, diorite?  Not on published OFR98-133",null,null,"TN002",2440,"Tanana","Ign",2440,"Kmum"]
["Ksp","Serpentinite and mafic rocks","Late Cretaceous?","Serpentinite, diabase-gabbro and some metadiorite.  Not on published OFR98-133",null,null,"TN002",2510,"Tanana","Ign",2510,"Kmum"]
["Jpu","Ultramafic rocks",null,"Serpentinized peridotite and dunite",null,null,"TN002",5150,"Tanana","Ign",5150,"Jaum"]
["Mg","Globe unit","Mississippian","Light-gray quartzite.  Massive or thinly interbedded quartzite and medium- to dark-gray slate, phyllite, and minor laminated claystone.  Age fro date of Trm intrusive and lithologic and stratigraphic similarities to Keno Hill Quartzite in Yukon.",null,null,"LG002",830,"Livengood","Meta",6530,"Mgq"]
["Dcg","Beaver Bend unit","Devonian?","Polymictic light- to medium-gray chert pebble conglomerate, graywacke, siltstone, and slate","Unidentifiable plant fragments",null,"LG002",843,"Livengood","Sed",6940,"Dcb"]
["bu","bedrock of unknown type or age","unknown","Rubble of metasiltstone and chert, believed to be older than TKf.  Also includes an outcrop of white, very fine grained quartz sandstone",null,null,"KH002",99,"Kantishna River",null,99,"bu"]
["Da","Augen gneiss","Devonian","Biotite-bearing felsic augen gneiss",null,"U/Pb age 387 +/- 43 Ma, protolith(?) age","CI002",702,"Circle","Ign",6521,"MDyao"]
["Kg","Granitic rocks","Cretaceous","Not on OF98-133",null,null,"KH003",2410,"Kantishna River","Ign",2410,"Kg"]
["Km","Gabbro and diorite","Cretaceous","Not on OF98-133",null,null,"KH003",2440,"Kantishna River","Ign",2440,"Kmum"]
["Ksp","Serpentinite with some diabase, gabbro and mafic volcaniclastic rocks","Cretaceous","Serpentinite with some diabase, gabbro and mafic volcaniclastic rocks.  Not on OF98-133",null,null,"KH003",2445,"Kantishna River","Ign",2445,"Kmum"]
["MzPzc","Circle Volcanics","Triassic and Penn. or Mississippian","Diabasic gabbro, basalt, diorite, ultramafic rocks, chert, and tuff.  Rare limestone.  Probably correlative with Rampart Group","Radiolarians from chert of Pennsylvanian, Mississippian, and Triassic age.",null,"CI002",502,"Circle","Ign",5130,"JTrtmu"]
["MzPzd","Diorite","Mesozoic and/or Paleozoic","Green, olive-green, or greenish-brown, medium- to very coarse-grained, porphyritic diorite.",null,null,"CI002",503,"Circle","Ign",5175,"MzPzi"]
["Pzp","Serpentinized periodotite","Paleozoic","Gray, green, and greenish-gray to greenish-black, fine- to coarse-grained serpentinized peridotite.",null,null,"CI002",608,"Circle","Ign",5980,"JPsu"]
["Pzug","Ultramafic and mafic rocks and greenstone","Paleozoic","Mostly greenish-black serpentinized peridotite.  Greenstone consists of metamorphosed basalt and tuff.",null,null,"CI002",600,"Circle","Ign",8250,"CZum"]
["QTa","Andesitic lava","Quaternary and/or Tertiary",null,null,null,"KH003",451,"Kantishna River","Ign",451,"QTa"]
["Tg","Granite","Tertiary",null,null,null,"KH003",1203,"Kantishna River","Ign",1320,"Tpgr"]
["TKa","Andesitic rocks","Tertiary and/ or Cretaceous","Andesite and trachyandesite are medium to light green and grayish green and weather to dull brown and brownish green;  fine to very fine-grained, prophyritic and glomeroporphyritic, abundant plagioclase phenocrysts 5-6 mm.",null,null,"KH002",1605,"Kantishna River","Ign",1605,"TKvi"]
["TKf","Felsic igneous rocks","Tertiary and/or Cretaceous","Light-gray weather, gray ot tan fine- to coarse-grained quartz porphyry.  Hypabyssal(?)",null,null,"CI002",301,"Circle","Ign",1602,"TKgp"]
["TKf","Felsic extrusive rocks and tuff","Tertiary and/ or Cretaceous","Very light to light gray, yellow and pink to red, mostly deeply weathered and in part iron-stained.  Rhyolitic and andesitic rocks are very fine-grained to aphanitic, porphyritic in part;  tuff resembles rhyolitic rocks may be welded in places",null,null,"KH002",1600,"Kantishna River","Ign",1603,"TKvr"]
["TKg","Granite","Tertiary and/or Cretaceous","Mostly light- to medium-gray, hypidiomorphic granular to porphyritic granite",null,"A number of K-Ar mineral ages (see Wilson and Shew, 1981), virtually all early Tertiary, 58 to 65 Ma","CI002",300,"Circle","Ign",1655,"TKg"]
["TKg","Granite","Tertiary and/ or Cretaceous","Monzonite, quartz monzonite, syenite, diorite, and quartz diorite; generally light to medium dark gray and weather to various shades of brown and gray",null,null,"KH002",1655,"Kantishna River","Ign",1655,"TKg"]
["TKr","Rhyolitic volcanic rocks","Tertiary and/ or Cretaceous","Rhyolite porphyry is light to very light gray, mostly deeply weatered to light to medium yellow and reddish brown;  very fine-grained, small phenocrysts of smoky quartz and kaolinized feldspar",null,null,"KH002",1603,"Kantishna River","Ign",1603,"TKvr"]
["TKv","Felsic volcanic rocks","Tertiary and/or Cretaceous",null,null,null,"KH003",1600,"Kantishna River","Ign",1603,"TKvr"]
["Trm","Diabase and basalt","Triassic (?)","Light- to medium-green and weathered to various shades of yellowish brown, reddish brown, and brown diabase and basalt.  Diabase is medium to coarse grained, in part porphyritic, very hard and breaks into angular blocks; basalt is very fine grained to ap",null,null,"KH002",4210,"Kantishna River","Ign",4210,"Trn"]
["PzpCb","Basalt and limestone","Paleozoic","Dark-greenish- or bluish-gray, medium-fine-grained calcareous basalt, having locally well-developed pillows.  Thin limestone layers at the base of the basalt.  Upper units in basalt amygdaloidal, overlain by greenish-brown breccia of calcareous basalt ha",null,null,"CI002",1200,"Circle","Ign",6680,"SZa"]
["Pzvs","Foliated basaltic lava, tuff, slaty shale, phyllite and some limestone and chert","Early Paleozoic","Not on OFR98-133",null,null,"KH003",5410,"Kantishna River","Ign",5410,"Pzvs"]
["TrPv","Basaltic and diabasic rocks, tuff, chert, argillite, slate, and rarely clastic limestone","Triassic and/or Permian","Extrusive and intrusive basaltic and diabasic rocks, tuff, chert, argillite, slate, and rarely clastic limestone.  Not on OFR98-133",null,null,"KH003",5140,"Kantishna River","Ign",5140,"JMab"]
["Trvs","Rhyolitic lava and breccia, tuff, chert and shale","Triassic","Unit deleted in going to TN003",null,null,"KH003",4205,"Kantishna River","Ign",4205,"Trvs"]
["Cal","Argillite and slate","Cambrian","Maroon and green argillite and slate with quartzite, grit, and some phyllite",null,null,"KH003",8410,"Kantishna River","Meta",8300,"CZw"]
["Cqs","Quartzite, metasiltstone, slate and grit","Cambrian","Range from light to dark gray ; quartzite is very fine-grained and grades to metasiltstone; blocky, irregular fractures, schistose in part; Slate and phyllite are medium gray; banded with thin silty or sandy layers in part.",null,null,"KH002",8420,"Kantishna River","Meta",8300,"CZw"]
["Dps","Phyllite,slate, silicious siltstone, and argillite","Late Devonian","Light and medium gray to silvery gray phyllite,slate, silicious siltstone and argillite; alters to hornfels near granitic contacts. Includes some thin limestone and calcareous siltstone.",null,null,"KH002",7210,"Kantishna River","Meta",6902,"Dp"]
["Kh","Hornfels and gneiss","Cretaceous","Unit removed on DOG map",null,null,"KH003",2640,"Kantishna River","Meta",2640,"Khg"]
["MzPzaq","Argillite and quartzite","Mesozoic and/or Paleozoic","Dark-gray to black, locally quartzitic argillite, mudstone, and siltstone.  Calcareous in a few places, has local gray and black chert.  Unit includes a gray, very fine-grained limestone at one locality.  Dark greenish-gray mafic lavas, including amygdal","Conodonts in limestone range in age from Ordivician to Triassic",null,"CI002",501,"Circle","Meta",5211,"MzPzaq"]
["Pze","Eclogite","Paleozoic","Medium-green, medium-grained, massive to foliated ecologite.  Occurs as mafic layers within unit PzpCms (NSACLASS = 5510), garnet-muscovite-schist, within which it is lumped on published map.",null,null,"CI002",610,"Circle","Meta",5475,"Pze"]
["Pzg","Greenstone","Paleozoic","Mostly coarse diabasic gabbros.  Small individual outcrop areas of a variety of texturally and mineralogically different rocks.  Unit removed from published (OFR98-133) map and from various versions of Foster and others map.  To be reinstated.",null,null,"CI002",609,"Circle","Meta",5640,"JPzsgs"]
["Pzm","Phyllite, calcareous phyllite and marble","Paleozoic","Gray phyllite containing thin stringers of crumbly impure marble and black or gray quartzitic phyllite.  May includes rocks of unit Pzq (NSACLASS = 5500).",null,null,"CI002",607,"Circle","Meta",5662,"Pzkcp"]
["PzpCa","Argillite, grit, and quartzite","Paleozoic and/or Precambrian","Gray, maroon, and green slaty argillite interlayered with gray and greenish-gray grit and quartzite.  Minor limestone in southern part of exposure.",null,null,"CI002",1000,"Circle","Meta",8300,"CZw"]
["PzpCgq","Grit, quartzite and argillite","Paleozoic and/or Precambrian","Mostly gray or greenish-gray, but may be tan, brown, or dark-gray grit and quartzite.  Ranges from fine- to coarse-grained, rarely conglomeratic, and equigranular to bimodal.  Weakly metamorphosed.  Gray to black, or greenish-gray, olive-gray, tan or bro","Trace fossil Oldhamia suggests a Cambrian or possibly Hadrynian (late pC age).",null,"CI002",1100,"Circle","Sed",8410,"Zwg"]
["PzpCgr","Grit and quartzite","Paleozoic and/or Precambrian","Tan or gray grit and quartzite.  Lower metamorphic grade and more calcareous than unit PzpCgq, but thought may be correlative.",null,null,"CI002",1800,"Circle","Meta",6511,"MDt?"]
["PzpCm","Mafic schist","Paleozoic and/or Precambrian","Green, chlorite-quartz-carbonate schist, associated with amphibolitic schist and mionr marble, quartzite, and pelitic schist.",null,null,"CI002",1700,"Circle","Meta",8660,"PzZms"]
["PzpCms","Garnet-muscovite schist","Paleozoic and/or Precambrian","Medium- to coarse-grained muscovite-garnet-quartz-plagioclase schist.",null,null,"CI002",1400,"Circle","Meta",5510,"Pze"]
["PzpCq","Quartzite and quartzitic schists, calc-silicate and marble subunit","Paleozoic and/or Precambrian","Light green to greenish-gray calc-silicate containing thin interlayers of crumbly, greenish-gray marble, light-green calcareous quartzite, gray and greenish-gray phyllite, and fine-grained quartzitic schist subunit of unit PzpCq, consisiting of gray or g",null,null,"CI002",1600,"Circle","Meta",9324,"PzZyqs"]
["PzpCs","Pelitic schist","Paleozoic and/or Precambrian","Mostly medium- to coarse-grained pelitic schist and gneiss, having minor interlayered quartzite and quartzitic schists and subordinate  white and cream-colored, coarse-grained marble.",null,null,"CI002",1300,"Circle","Meta",8630,"PzZysa"]
["Pzq","Quartzite, meta-argillite and phyllite","Paleozoic","Black, dark-gray, or gray.  Quartzite is medium-grained, thinly layered to massive.  Meta-argillite may be slaty.  Unit cut by abundant white quartz veins.  Stratigraphically overlies calcareous phyllite and marble unit (Pzm, NSACLASS = 5545)",null,null,"CI002",606,"Circle","Meta",5660,"Pzk"]
["Pzsl","Schist, phyllite, limestone, and greenstone","Early Paleozoic","Schist and phyllite are light to medium green and light to medium gray; chlorite and mica common, partly calcareous intensely folded, interbedded with limestone. Limestone is light and medium gray, largely recrystallized; greenstone is basaltic, light to",null,null,"KH002",5665,"Kantishna River","Meta",6956,"DSls?"]
["Pzsr","Quartz -mica-garnet schist, with some quartzite schist, calcareous schist, marble and phyllite","Paleozoic","Not on OFR98-133",null,null,"KH003",5208,"Kantishna River","Meta",5208,"TPza"]
["KJqa","Quartzite, argilllite, conglomerate, and hornfels","Cretaceous and/or Jurassic","Mostly gray, fine- to medium-grained quartzite, interlayered with mostly gray, greenish-gray, reddish-gray, and tan argillite",null,null,"CI002",400,"Circle","Meta",2815,"KJw"]
["MzPzat","Argillite, tuff, quartzite and conglomerate","Mesozoic and/or Paleozoic","Two parts.  One include rocks around VABM Vrain, composed mostly of argillite and minor quartzite and slaty argillite.  Second shown by ttt symbol is characterized by tuffaceous rocks associated with  black or dark-gray argillite and conglomerate.  VRAIN",null,null,"CI002",400,"Circle","Meta",2860,"KJvr"]
["Dl","Limestone","Devonian","Medium-gray, generally massive, locally recrystallized limestone.  Correlative with Tolovana limestone?","Stromatoporoids, corals, and condonts, result in earliest Early Devonian age.  Another part of unit(?), has corals restricting age to late Early Devonian.",null,"CI002",701,"Circle","Sed",6944,"DSl"]
["Dls","Limestone and siltstone","Devonian","Chiefly limestone, medium to dark gray; dolomitic in part; Siltstone is medium gray, shaly to phyllitic","Phillipsastrea or Pachyphyllum sp. (massive rugose coral) and Thamnopora sp. and Disphyllum? sp.",null,"KH002",6945,"Kantishna River","Sed",6944,"DSl"]
["DSd","Dolomite and argillite","Devonian and/or Silurian","Mostly yellow-gray dolomite and moslty gray and dark-gray to black argillite, shale, and siltstone.  Interlayered with light- and dark-gray chert, yellow-gray dolomite, gray marble, and gray, fine-grained quartzite.",null,null,"CI002",700,"Circle","Sed",6681,"SZa?"]
["DSl","Limestone, dolomite, and shale","Devonian and/or Silurian","Medium-light- to dark-gray, fine- to medium-grained limestone.  Locally limstone contains interlayered minor dolomite and dark-gray shale.  Correlates with Tolovana Limestone of Livengood quadrangle.",null,null,"CI002",703,"Circle","Sed",6945,"Ds"]
["DSt","Tolovana Limestone","Devonian and/or Silurian",null,null,null,"KH003",6965,"Kantishna River","Sed",6965,"DSt"]
["KJcs","Sandstone, quartzite, conglomerate, siltstone, and slaty shale","Cretaceous and/or Jurassic",null,null,null,"KH003",2820,"Kantishna River","Sed",2115,"Kwcf"]
["KJgs","Graywacke and shale","Jurassic and/or Cretaceous","Sandstone, siltstone, and shale, medium gray, generally thin bedded",null,null,"KH002",2116,"Kantishna River","Sed",2115,"Kwcf"]
["Oc","Chert and slate","Ordovician","Medium to medium dark gray and weathers to light yellow, tan and orange",null,null,"KH002",7550,"Kantishna River","Sed",7710,"Och"]
["Oc","Chert and some slaty slate","Ordovician",null,null,null,"KH003",7510,"Kantishna River","Sed",7710,"Och"]
["OCsl","Siltstone. limestone, phyllite and chert","Ordovician and/or Cambrian","Mostly light-medium to dark gray and weather yellow, brown and gray; thin bedded; chert rare",null,null,"KH002",7580,"Kantishna River","Sed",7580,"SCpl"]
["Old","Livengood Dome (?) Chert","Ordovician","Dark-gray and black chert, gray argillite and shale and slate, gray dolomite, and minor greenish-gray, dirty and dark-gray recrystallized limestone.  Mafic volcanic rocks.",null,null,"CI002",900,"Circle","Sed",7710,"Och"]
["Ps","Slaty shale, siltstone, graywacke, and conglomerate","Permian","Not on OFR98-133",null,null,"KH003",5740,"Kantishna River","Sed",5740,"Ps"]
["Pzcc","Chert, conglomerate and limestone","Paleozoic","Chert and chert-pebble conglmerate most characteristic.  Chert is dominantly gray or black, locally massive, commonly brecciated.","Interlayered limestone contained late Late Devonian conodonts",null,"CI002",603,"Circle","Sed",6940,"Dcb"]
["Pzcg","Chert pebble conglomerate","Paleozoic","Mostly gray chert pebble conglomerate.  Conglomerate clasts dominantly chert but include minor quartz, quartzite and rare argillite and siltstone fragments","Poorly preserved radiolarins (Spumellariina) of indeterminate age.",null,"CI002",602,"Circle","Sed",6940,"Dcb"]
["Pzl","Limestone and chert","Paleozoic","Two separate(?) units.  Eastern unit is light-gray to medium-dark-gray at top, mostly fine-grained, partly recrystallized, blocky fracturing limestone.  Possible algal structures.  Western unit ranges from light- to dark-gray limestone apparently interla",null,null,"CI002",605,"Circle","Sed",5330,"Pzlc"]
["Pzw","Quartz wacke","Paleozoic",null,null,null,"KH003",6922,"Kantishna River","Sed",6922,"Dq2?"]
["Tcs","Conglomerate and sandstone","Tertiary","Mostly gray or tan, but locally pink or orange-brown conglomerate.  Ranges in grainsize from coarse to fine, grades into sandstone.  Sandstone is gray, tan, iron-oxide stained, commonly with \"salt and pepper\" appearance, fine to coarse-grained and locall",null,null,"CI002",200,"Circle","Sed",500,"Tsu"]
["SOs","Siltstone, dolomite, chert, and mafic igneous rocks","Silurian and/or Ordovician","Gray, black, or olive-gray siltstone and argillite and mudstone.  Tan dolomite, gray to dark-gray fine-grained limestone, gray or dark-gray chert.  Mafic igneous rocks are dikes, sills, and small lense-like bodies of dark-greenish-black gabbro and basalt",null,null,"CI002",800,"Circle","Ign",7010,"Dsv"]
["PaMc","Chert, argillite, and quartzite","Penn. and/or Mississippian","Mostly black, gray, and dark-gray chert, also includes light-gray, green and white banded chert.  Rare gray, dark-gray, and black argillite, shale, slate, and siltstone and gray quartzite.  Unit form east trending belt in east Crazy Mountains.  Maybe be","Radiolarian, Albaillella sp., and Paronaella impella Ormiston and Lane of Late Mississippian age. Also Spongodiscaceid gen. nov. (tetrahedral) of latest Late Mississippian or Early Pennsylvanian age.",null,"CI002",601,"Circle","Meta",5020,"TrMts"]
["Pzc","Chert and argillite","Paleozoic","Gray, black, and banded chert interlayered with gray, green, olive, black, gray, and tan argillite, rare gray marble, white quartzite, and white calcareous quartzite.  Locally intruded by drak-greenish-gray to black diorite and gabbro.","Poorly preserved radiolaria, Spumellariina, possibly of Mississippian age.",null,"CI002",604,"Circle","Meta",6910,"Dtr"]
["Pzc","Calcareous schistose siltstone and sandstone, and some phyllite","Paleozoic","Not on OFR98-133",null,null,"KH003",5542,"Kantishna River","Meta",5542,"TrMtqp"]
["Pzcs","Siltstone, slate, phyllite, and argillite","Paleozoic","Siltstone, slate, phyllite, and argillite",null,null,"KH003",7210,"Kantishna River","Meta",8300,"CZw"]
["Pzl","Limestone, dolomite, basaltic greenstone and chloritic schist","Early Paleozoic","Limestone, dolomite, basaltic greenstone and chloritic schist; some argillite, phyllite and quartz-mica schist",null,null,"KH003",6956,"Kantishna River","Sed",8601,"PzZrqs"]
["PzpCd","Dolomite and marble","Paleozoic and/or Precambrian","Gray to cream-colored massive dolomite, gray or greenish-gray marble interlayered in calcareous greenish-gray and gray quartzite and phyllite and greenish-gray calc-silicate.",null,null,"CI002",1500,"Circle","Meta",8615,"Pzydm"]
["Qa","Alluvium","Quaternary","Gravel, sand, and silt, gray, buff, or brown.  Unconsolidated, well-sorted, well-stratified.",null,null,"CI002",100,"Circle","Unconsol",100,"Qs"]
["Qab","Abandoned flood plain alluvium","Quaternary","Gray to brown gravel, granule to boulder size, well-sorted, well-stratified, covered with as much as 8 m of silt and organice material.  Perennially frozen.",null,null,"CI002",101,"Circle","Unconsol",100,"Qs"]
["Qac","Alluvium and colluvium","Quaternary","Boulders, gravel, sand, silt, and angular rock fragments, mostly poorly sorted and poorly stratified.",null,null,"CI002",102,"Circle","Unconsol",100,"Qs"]
["Qaf","Alluvial fan deposits","Quaternary","Gray, tan, and brown sandy pebble-cobble gravel and pebble-cobble-boulder gravel having lenses and layers of sand, silt, and organic material.",null,null,"CI002",103,"Circle","Unconsol",100,"Qs"]
["Qaf","Fan deposits","Quaternary","Gravel, silt and sand, coarse clastics subangular to subrounded",null,null,"KH002",100,"Kantishna River","Unconsol",100,"Qs"]
["Qaf","Alluvial Fan deposits","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qags","Older alluvium","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qal","Alluvium","Quaternary","Sandy gravel and sandy silt; coarse clastics subrounded to well rounded",null,null,"KH002",100,"Kantishna River","Unconsol",100,"Qs"]
["Qal","Recent Alluvium","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qat","Altiplanation terrace","Quaternary","Flat, even surface, cut on bedrock in high areas; generally less than 2 hectares in area; thin mantle of coarse, angular rock fragments",null,null,"KH002",161,"Kantishna River","Unconsol",100,"Qs"]
["Qat","Altiplanation terrace","Quaternary",null,null,null,"KH003",161,"Kantishna River","Unconsol",100,"Qs"]
["Qb","Rock-defended terraces on Minook Creek","Quaternary",null,null,null,"KH003",160,"Kantishna River","Unconsol",100,"Qs"]
["Qbg","Low-level bench gravel of Minook Creek","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qc","Colluvium,  undifferentiated","Quaternary","Predominately silt with some larger fragments, commonly poorly sorted",null,null,"KH002",107,"Kantishna River","Unconsol",100,"Qs"]
["Qc","Colluvium,  undifferentiated","Quaternary",null,null,null,"KH003",107,"Kantishna River","Unconsol",100,"Qs"]
["Qcal","Colluvium and alluvium,  undifferentiated","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qess","Sand and silt","Quaternary","Elongate dunes",null,null,"KH002",120,"Kantishna River","Unconsol",100,"Qs"]
["Qess","Sand and silt","Quaternary",null,null,null,"KH003",120,"Kantishna River","Unconsol",100,"Qs"]
["Qg","Gravel","Quaternary","Light-gray to light-yellowish-brown, pebble to boulder size, containing thin layers of sand and silt. Probably was at one time large alluvial fan of Yukon River.",null,null,"CI002",106,"Circle","Unconsol",100,"Qs"]
["Ql","Loess","Quaternary","Silt and sandy silt, eolian, yellowish-gray to light-gray.  Well-sorted, homogeneous, unconsolidated, generally perennially frozen.",null,null,"CI002",107,"Circle","Unconsol",100,"Qs"]
["Ql","Loess","Quaternary",null,null,null,"KH003",121,"Kantishna River","Unconsol",100,"Qs"]
["Qlc","Clay, silt, sand and gravel","Quaternary","Well-bedded lake deposits; at least 60 m thick",null,null,"KH002",112,"Kantishna River","Unconsol",100,"Qs"]
["Qls","Older landslide deposits","Quaternary",null,null,null,"KH003",108,"Kantishna River","Unconsol",100,"Qs"]
["Qm","Morainal deposits, undifferentiated","Quaternary","Boulders, gravel, sand, silty sand in terminal, lateral, cirque and ground moraine.",null,null,"CI002",108,"Circle","Unconsol",100,"Qs"]
["Qoa","Older alluvium","Quaternary","Sandy gravel and sandy silt; represents old floodplains",null,null,"KH002",100,"Kantishna River","Unconsol",100,"Qs"]
["Qrs","Recent slide and slump deposits","Quaternary",null,null,null,"KH003",100,"Kantishna River","Unconsol",100,"Qs"]
["Qs","Silt and peat","Quaternary","Organic silt deposited in swamps.  Black, dark-gray, mottled dark-gray and brown.  Mostly perennially frozen.",null,null,"CI002",104,"Circle","Unconsol",100,"Qs"]
["Qs","Silt","Quaternary","Probably includes both loess and solifluction mantle.  Lakes are common.  Units separated by low, elongated hills which are probably dunes",null,null,"KH002",122,"Kantishna River","Unconsol",100,"Qs"]
["Qsf","Solifluction mantle","Quaternary","Silt ,some sand, and a small amount of bedrock fragments",null,null,"KH002",128,"Kantishna River","Unconsol",100,"Qs"]
["Qsu","Silt, undifferentiated and organic material","Quaternary","Gray, dark-gray, dark-brown or black silt, organic silt, and peat, containing local sandy lenses and layers.  Locally highly organic, generally perennially frozen.  Up to 60 m thick.",null,null,"CI002",105,"Circle","Unconsol",100,"Qs"]
["Qt","Till, undifferentiated","Quaternary",null,null,null,"KH003",125,"Kantishna River","Unconsol",100,"Qs"]
["Qt (1)","Till","Quaternary",null,null,null,"KH003",138,"Kantishna River","Unconsol",100,"Qs"]
["Qt (2)","Till","Quaternary",null,null,null,"KH003",137,"Kantishna River","Unconsol",100,"Qs"]
["Qt (3)","Till","Quaternary",null,null,null,"KH003",136,"Kantishna River","Unconsol",100,"Qs"]
["Qt (4)","Till, cirque glaciation","Quaternary",null,null,null,"KH003",130,"Kantishna River","Unconsol",100,"Qs"]
["Qta","Talus","Quaternary",null,null,null,"KH003",107,"Kantishna River","Unconsol",100,"Qs"]
["QTg","High-level gravel","Quaternary",null,null,null,"KH003",285,"Kantishna River","Unconsol",100,"Qs"]
["Qtr","Terrace deposits","Quaternary",null,null,null,"KH003",110,"Kantishna River","Unconsol",100,"Qs"]
["Qal","Active stream alluvium","Quaternary","Active stream alluvium",null,null,"SM002",105,"Sleetmute","Unconsol",100,"Qs"]
["Qg3","Ground and medial moraine","Pleistocene","Ground and medial moraines interpreted from aerial photographs",null,null,"SM002",136,"Sleetmute","Unconsol",100,"Qs"]
["Qg2","Ground and medial moraine","Pleistocene","Ground and medial moraines interpreted from aerial photographs",null,null,"SM002",137,"Sleetmute","Unconsol",100,"Qs"]
["Qg1","Ground and medial moraine","Pleistocene","Ground and medial moraines interpreted from aerial photographs",null,null,"SM002",138,"Sleetmute","Unconsol",100,"Qs"]
["Qou","Glacial outwash deposits","Pleistocene","Glacial outwash deposits",null,null,"SM002",140,"Sleetmute","Unconsol",100,"Qs"]
["Qg","Undifferentiated glacial deposits","Pleistocene","Undifferentiated glacial deposits",null,null,"SM002",135,"Sleetmute","Unconsol",100,"Qs"]
["Qu","Undifferentiated alluvial, colluvial, and eolian deposits","Quaternary","Undifferentiated alluvial, colluvial, and eolian deposits",null,null,"SM002",100,"Sleetmute","Unconsol",100,"Qs"]
["Tb","Columnar basalt","Tertiary","Cloumnar basalt, exposed 9 mi northeast of Fortyseven Creek landing strip.",null,"K-Ar whole-rock, 38.2 Ma","SM002",1004,"Sleetmute","Ign",1004,"Tb"]
["Tg","Small stocks","Tertiary","Small stocks, chiefly quartz monzonite, exposed in southeast corner of quadrangle.",null,"K-Ar biotite 41.7 Ma","SM002",1300,"Sleetmute","Ign",1300,"Tegr"]
["TKr","Sheets, dikes, and sills of rhyolite","early Tertiary, Late Cretaceous","Sheets, dikes, and sills of peraluminous biotite + muscovite rhyolite.",null,"Six K-Ar biotite and whole-rock ages ranging from 61.5 to 70.5 Ma","SM002",1603,"Sleetmute","Ign",1603,"TKvr"]
["TKd","Dikes and sills","early Tertiary, Late Cretaceous?","Dikes and thin sills of felsic to mafic composition mostly altered to carbonate, quartz, sericite, and clay.  Age based on intrusive relationship with late Early to Late Cretaceous sedimentary rocks (unit Kk, Kuskokwim Group).",null,null,"SM002",1601,"Sleetmute","Ign",1601,"TKd"]
["TKvf","Felsic volcanic rocks","early Tertiary, Late Cretaceous?","Felsic volcanic rocks associated with volcano-plutonic complexes, primarily composed of rhyolite tuffs and flows.  Equivalent in part to Getmuna Rhyolite of Cady and others (1955) and Holokuk Basalt of Reifenstuhl and others (1984)",null,"K-Ar whole-rock of 43.8 Ma","SM002",1625,"Sleetmute","Ign",1625,"TKvr"]
["TKv","Mafic volcanic rocks","early Tertiary, Late Cretaceous","Mafic volcanic rocks associated with volcano-plutonic complexes; lower unit of TKvf/TKv group.  Composed of  flows  and lesser tuff, agglomerate, and minor lahar units of dominatly mafic composition.  Intermediate and felsic rocks also present.  Named Ho",null,"Seven K-Ar ages on plagioclase and whole rocks range from 64.3 to 74.5 Ma","SM002",1630,"Sleetmute","Ign",1630,"TKiv"]
["TKg","Plutonic rocks","early Tertiary, Late Cretaceous","Plutonic rocks associated with volcano-plutonic complexes, monzonite, quartz monzonite, granodiorite, and granite stocks and minor dikes of mafic to felsic composition.",null,"Six K-Ar ages on biotite and hornblende range from 63.8 to 68.9 Ma","SM002",1650,"Sleetmute","Ign",1650,"TKi"]
["Kk","Kuskokwim Group","late Early Cretaceous to Late Cretaceous","Interbedded sandstone, siltstone, shale, and minor conglomerate.  Primarily submarine fan and turbidite association.","Rare fossils constrin age.",null,"SM002",1970,"Sleetmute","Sed",1970,"Kk"]
["KTrg","Gemuk Group","Cretaceous to Triassic","Chiefly siltstone, interbedded with lesser amounts of chert and volcanic rock (including tuff), and minor limestone, graywacke, and breccia.","Early Cretaceous and Cretaceous fossils from map area, Late Triassic found to southwest.",null,"SM002",4710,"Sleetmute","Sed",4710,"MzPzgs"]
["Pzl","Holitna Group","Middle Cambrian to early Middle Devonian","Limestone, in partly dolomitized, chiefly massive but thinner bedded in upper zones.  Contains small reef-like deposits and local intraformational conglomerate and breccia.","Stromatopora sp., Favosites sp., Monotrypa sp., Spirifer (Emmanuella?) sp., Athyris sp., Productella sp., Proetus sp., trilobites, Cyathophylloid corals",null,"SM002",6960,"Sleetmute","Sed",6960,"DSwc"]
["MzPzat","Argillite, tuff, quartzite and conglomerate","Mesozic and/or Paleozoic","Two parts, tuffaceous part of unit, see KJvr also for main part of unit.  One includes rocks around VABM Vrain, composed mostly of argillite and minor quartzite and slaty argillite.  Second shown by ttt symbol is characterized by tuffaceous rocks associa",null,null,"CI002",550,"Circle","Meta",2875,"KJvt"]
["MzPzaq","Argillite and quartzite","Mesozoic and/or Paleozoic","Vitreous quartzite part of unit, mapped separately.  Light-gray, dense quartzite having a vitreous luster.  Dark-gray to black, locally quartzitic argillite, mudstone, and siltstone.  Calcareous in a few places, has local gray and black chert.  Unit incl","Conodonts in limestone range in age from Ordivician to Triassic",null,"CI002",5000,"Circle","Meta",6530,"Mgq"]
["PzpCq","Quartzite and quartzitic schists, quartzite subunit","Paleozoic and/or Precambrian","Light- to medium-gray, fine- to medium-grained relatively pure quartzite of unit PzpCq, which consists of gray or greenish-gray quartzite and quartzitic schists are dominant rock types.  Minor pelitic schist, calc-silicate, mafic schist, and rare marble",null,null,"CI002",1610,"Circle","Meta",9323,"PzZyqs"]
["PzpCq","Quartzite and quartzitic schists, greenschist subunit","Paleozoic and/or Precambrian","Green or greenish-gray, medium-grained, and massive to foliated greenschist subunit(?) of unit PzpCq, consisting of gray or greenish-gray quartzite and quartzitic schists are dominant rock types.  Minor pelitic schist, calc-silicate, mafic schist, and ra",null,null,"CI002",0,"Circle","Meta",9326,"PzZyqs"]
["PzpCqm","Quartzite and quartzitic schists, magnetic chlorite schist subunit","Paleozoic and/or Precambrian","Magnetic chlorite schist subunit of unit PzpCq, consisiting of gray or greenish-gray quartzite and quartzitic schists are dominant rock types.  Minor pelitic schist, calc-silicate, mafic schist, and rare marble are interlayered with quartzite and quartzi",null,null,"CI002",1650,"Circle","Meta",9321,"PzZyqs"]
["PzpCs","Pelitic schist, quartzite subunit","Paleozoic and/or Precambrian","Mostly medium- to coarse-grained pelitic schist and gneiss, having minor interlayered quartzite and quartzitic schists and subordinate  white and cream-colored, coarse-grained marble.",null,null,"CI002",1320,"Circle","Meta",8802,"PzZypg"]
["PzpCs","Pelitic schist, sillimanite gneiss subunit","Paleozoic and/or Precambrian","Mostly medium- to coarse-grained pelitic schist and gneiss, having minor interlayered quartzite and quartzitic schists and subordinate  white and cream-colored, coarse-grained marble.",null,null,"CI002",1310,"Circle","Meta",8632,"PzZpg"]
["unk","Limestone","Paleozoic and or preCambrian","Various limestone symbol shown on Circle map in a variety of rock units.  No further description in text.  Includes on northern polygons of unit",null,null,"CI002",1900,"Circle","Sed",8000,"CZwl"]
["unk","Chert","Paleozoic and or preCambrian","Various chert symbols shown on Circle map in a variety of rock units.  No further description in text.  Assigned to Cascaden on the basis of location.",null,null,"CI002",1910,"Circle","Sed",6940,"Dcb"]
["Qal","Alluvium","Quaternary",null,null,null,"KH004",100,"Kantishna River","Unconsol",100,"Qs"]
["Qc","Colluvium","Quaternary",null,null,null,"KH004",101,"Kantishna River","Unconsol",100,"Qs"]
["Qs","Silt","Quaternary",null,null,null,"KH004",102,"Kantishna River","Unconsol",100,"Qs"]
["Qdl","Dune sand and loess","Quaternary","Both medium- and fine-grained sand dunes, massive silt deposits, particularly on windward slopes, and relatively thin veneers of silt.  The linear dunes trend SW, are commonly several km long and 8 to 20 m high, and have rounded tops.",null,null,"KH004",103,"Kantishna River","Unconsol",100,"Qs"]
["Ql","Lacustrine deposits","Quaternary",null,null,null,"KH004",104,"Kantishna River","Unconsol",100,"Qs"]
["Tn","Nenana gravel","Tertiary",null,null,null,"KH004",570,"Kantishna River","Unconsol",570,"Tn"]
["TKg","Granitic rocks","Tertiary",null,null,null,"KH004",201,"Kantishna River","Ign",1655,"TKg"]
["TKv","Volcanic rocks","Tertiary",null,null,null,"KH004",202,"Kantishna River","Ign",1603,"TKvr"]
["Dl","Limestone","Devonian",null,null,null,"KH004",300,"Kantishna River","Sed",6944,"DSl"]
["DSt","Tolovana limestone","Devonian",null,null,null,"KH004",301,"Kantishna River","Sed",6965,"DSt"]
["DOc","Chert","Devonian/Ordovican",null,null,null,"KH004",302,"Kantishna River","Sed",7710,"Och"]
["DOs","Shaly rocks","Devonian/Ordovican","Shaly rocks",null,null,"KH004",303,"Kantishna River","Sed",6902,"Dp"]
["pOlp","Limestone and phyllite","pre-Ordovican","Impure limestone, dolomite, greenish-gray phyllite, and silty shale, all of very low metamorphic grade.",null,null,"KH004",400,"Kantishna River","Sed",7580,"SCpl"]
["bu","Bedrock undifferentiated","pre-Ordovican",null,null,null,"KH004",99,"Kantishna River",null,99,"bu"]
["Qfy","Younger flood-plain deposits","Quaternary",null,null,null,"NL003",100,"Nulato","Unconsol",100,"Qs"]
["Qfo","Older flood-plain deposits","Quaternary",null,null,null,"NL003",101,"Nulato","Unconsol",100,"Qs"]
["Qhs","High-terraces and slope deposits","Quaternary",null,null,null,"NL003",102,"Nulato","Unconsol",100,"Qs"]
["Ta","Andesite and basalt flows","Eocene and Paleocene",null,null,null,"NL003",200,"Nulato","Ign",1000,"Tvu"]
["Tr","Rhyolite and dacite flows and shallow intrusive bodies","Eocene and Paleocene",null,null,null,"NL003",201,"Nulato","Ign",1000,"Tvu"]
["TKh","Small intrusive bodies of silicic and intermediate composition","Early Tertiary and Late Cretaceous",null,null,null,"NL003",1655,"Nulato","Ign",1655,"TKg"]
["Kgr","Biotite granite","Cretaceous",null,null,null,"NL003",2410,"Nulato","Ign",2530,"Kg"]
["TKhs","Small intrusive bodies and thermally altered sed. rx","Early Tertiary and Late Cretaceous","Small intrusive bodies and thermally altered sedimentary rocks of the Yukon-Koyokuk basin belonging to units Ks and Kg",null,null,"NL003",203,"Nulato","Ign",1655,"TKg"]
["Ksu","Undifferentiated sedimentary rocks","Late and Early Cretaceous","Sandstone, shale, and conglomerate marine and nonmarine deltaic deposits in northwest part of quadrangle",null,null,"NL003",1940,"Nulato","Sed",2021,"Kme"]
["Km","Marine sedimentary rocks","Early Cretaceous","Sandstone, siltstone, and shale fossiliferous marine deltaic deposits",null,null,"NL003",2101,"Nulato","Sed",2101,"Ksse"]
["Kcs","Marine sedimentary rocks","Early Cretaceous","Calcareous sandstone, siltstone, and shale prodelta deposits",null,null,"NL003",303,"Nulato","Sed",2152,"Km"]
["Kg","Turbidite deposits","Early Cretaceous","Graywacke and mudstone turbidite deposits",null,null,"NL003",2105,"Nulato","Sed",2180,"Kvm"]
["Kv","Andesite volcanic rocks","Early Cretaceous",null,null,null,"NL003",2220,"Nulato","Ign",2330,"Kve"]
["Jcu","Cumulate ultramafic rocks","Middle and Late Jurassic",null,null,null,"NL003",402,"Nulato","Ign",3496,"Jtu"]
["Jht","Harzburgite tectonite","Middle and Late Jurassic",null,null,null,"NL003",401,"Nulato","Ign",3497,"Jtu"]
["Juu","Ultramafic rocks, undivided","Middle and Late Jurassic",null,null,null,"NL003",301,"Nulato","Ign",3498,"Jtu"]
["TrMb","Basalt, gabbro, diabase, tuff, and chert","Mississippian to Triassic",null,null,null,"NL003",5133,"Nulato","Ign",5130,"JTrtmu"]
["TrMq","Quartzite, phyllite, limestone","Mississippian to Triassic",null,null,null,"NL003",5542,"Nulato","Meta",5542,"TrMtqp"]
["PzpCs","Schist and quartzite","Paleozoic and Proterozoic?",null,null,null,"NL003",8650,"Nulato","Meta",8650,"PzZrmc"]
["PzpCc","Carbonate rocks","Paleozoic and Proterozoic?",null,null,null,"NL003",8610,"Nulato","Sed",8620,"Pzrm"]
["PzpCm","Metabasites","Paleozoic and Proterozoic?",null,null,null,"NL003",8450,"Nulato","Meta",8450,"MzZum"]
["ls","Landslide deposits","Quaternary?",null,null,null,"NL003",100,"Nulato","Unconsol",100,"Qs"]
["Kgs","Graywacke sandstone and mudstone -- volcanic conglomerate","Early(?) Cretaceous","Massive volcanic conglomerate mapped within unit or poorly sorted, muddy sandstone (graywacke) interbedded with mudstone.  Conglomerate appears gradational with coarse breccias and agglomerates of andesitic volcanic rocks (unit KJv, KT quad.)","Associated and gradational(?) with units containing Buchia of earliest Cretaceous age.",null,"KT002",202,"Kateel River","Sed",2181,"Kvm"]
["TKv","Extrusive rocks","Cretaceous  or Tertiary","Basaltic, andesitic, and rhyolitic flows, tuffs, and breccias, and a few dacite flows; interbedded  sandstone and shale.  Flows commonly porphyritic and gently dipping. Probably greater than 500 feet thick.  (Description from RB002, should match on this",null,null,"RB003",202,"Ruby","Ign",1603,"TKvr"]
["Qu","Alluvium","Quaternary","Silt, sand, and gravel of stream beds, flood plains, and terraces",null,null,"RB003",100,"Ruby","Unconsol",100,"Qs"]
["JPb","Basalt and diabase of Rampart Group","Jurassic to Permian","Basalt and diabase of Rampart Group.",null,null,"RB003",5140,"Ruby","Ign",5140,"JMab"]
["Pg","Graywacke","Permian","Unit probably correlative with similar clastic rocks of the Permian(?) Rampart Group.  Unit has three parts; a) fine- to medium-grained, medium-gray to dark-greenish-gray graywacke, calcareous in part and containing some dark-gray shale fragments, b) gri","Nodosinellids (Tetrataxis), bryozoan and echinoderm debris.",null,"RB003",104,"Ruby","Sed",5021,"TrMis"]
["MDc","Chert and argillite","Late(?) Mississippian and very latest Devonian","Medium-dark to dark-gray, thin-banded, bedded, radiolarian-bearing chert containing thin interbeds of slaty argillite.  (See unit 6080 in MD quadrangle, correlated in part.).  Mapped as Kca by Cass (1959)","Radiolarians",null,"RB003",303,"Ruby","Sed",6390,"TrMica"]
["Pzc","Carbonate rocks","Early Paleozoic","see unit 7520 Od in Ruby or unit 5340, Ophir quadrangle.  Did not appear on final map.",null,null,"RB003",5340,"Ruby","Sed",5340,"Pzrm"]
["PzpCm","Metamorphic rocks","Paleozoic and preCambrian?","Not described",null,null,"RB003",8600,"Ruby","Sed",9325,"PzZrqs"]
["Kku","Kuskokwim Group","Middle to Late Cretaceous","Chiefly marine basin and fan deposits",null,null,"LH003",1970,"Lime Hills","Sed",1970,"Kk"]
["JKw","Feldspathic wacke","Jurassic or Cretaceous","Red-weathering, locally calcareous, felspathic wacke contiaining siltstone interbeds.  Not on OFR98-133 as published.",null,null,"LH003",2825,"Lime Hills","Sed",2825,"KJfm"]
["Trb","Pillow basalt","Triassic?","Pillow basalt interbedded with minor argillite and chert.  See LH004 for revised unit.","Radiolaria suggest Triassic age",null,"LH003",4210,"Lime Hills","Ign",4215,"JTrtv"]
["Mzv","Metabasalt and andesite","pre-Cretaceous","Metabasalt and metaandesite volcanic rocks",null,null,"LH003",4910,"Lime Hills","Meta",5220,"JPzk"]
["Mzu","Undifferentiated metavolcanic and metasedimentary rocks","pre-Cretaceous","Undifferentiated metavolcanic and metasedimentary rocks",null,null,"LH003",4920,"Lime Hills","Meta",5220,"JPzk"]
["MzPzi","Altered diabase","pre-Tertiary?","Altered diabase, andesite breccia, and aphanitic to porphyritic andesite.  Age unknown, thought to be pre-Tertiary",null,null,"LH003",5120,"Lime Hills","Ign",5180,"MzPzi"]
["DSab","Calcareous mudstone and limestone algal reef complex","Devonian - Silurian","Calcareous mudstone and limestone algal reef complex.  Shelf edge environment",null,null,"LH003",6960,"Lime Hills","Sed",6960,"DSwc"]
["PPl","Thick bedded limestone","Permian, Pennsylvanian?","Thick-bedded limestone, open marine shelf enviroment.  Age not reported, could be Permian, Pennsylvanian?  (Unit deleted in Bundtzen compilation[LH004])",null,null,"LH003",5341,"Lime Hills","Sed",5341,"PPl"]
["UDl","Thick bedded limestone","Late Devonian?","Thick-bedded limestone, open marine shelf enviroment.  Age not reported, could be Late (Upper) Devonian?",null,null,"LH003",6932,"Lime Hills","Sed",6931,"DSml"]
["DSls","Laminated limestone, sandstone, and siltstone","Devonian - Silurian","Laminated limestone, micaceous sandstone, and siltstone.  Slope environment.",null,null,"LH003",6957,"Lime Hills","Sed",6957,"DSls"]
["Sa","Argillite","Silurian","Dark-gray to black argillite with(?) chert, siltstone, and shale",null,null,"LH003",6630,"Lime Hills","Sed",6630,"Sa"]
["Ss","Micaceous calc-sandstone","Silurian","Micaceous calc-sandstone with minor limestone",null,null,"LH003",6640,"Lime Hills","Sed",6640,"Ss"]
["SOls","Argillaceous limestone, sandstone, and shale","Silurian - Ordovician","Argillaceous limestone, calc-sandstone, and graptoloitic shale.  Slope to basinal deposits.  Unit removed, replaced largely by unit SCpl from Bundtzen (1997)","Graptolites",null,"LH003",6951,"Lime Hills","Sed",7580,"SCpl"]
["Tbr","Big River pluton","Early Tertiary?","Medium- to coarse-grained, seriate, hypidiomorphic- granular biotite granite.  Similar to and likely apothesis of Tired Pup pluton",null,null,"LH002",104,"Lime Hills","Ign",1320,"Tpgr"]
["Twf","Windy Fork pluton","middle Tertiary","Peralkaline granite in two distinct phases, an alkali feldspar granite and granite.  Overlaps into McGrath quadrangle.  Anomalous U and Th near northern margin of pluton",null,"K-Ar biotite 29.0 to 31.1 Ma","LH002",105,"Lime Hills","Ign",1270,"Togr"]
["TKg","Northern Intermediate plutons","Tertiary or Cretaceous","Biotite-amphibole granite to quartz monzonite; diorite also present.",null,null,"LH002",109,"Lime Hills","Ign",1655,"TKg"]
["Tmp","Merrill Pass pluton","middle Tertiary","Elongate pluton that is chiefly biotite- or biotite-hornblende granite.",null,"K-ar biotite 35.6 to 40.0 Ma, 40/39 biotite 40.0 to 42.2 Ma","LH002",110,"Lime Hills","Ign",1290,"Toegr"]
["Tmpg","Merrill Pass intermediate phases","middle Tertiary?","Highly variable intrusions spatially associated with Merrill Pass pluton.  Ranges from quartz diorite to granite, northern samples typically granodiorite and granite.  Larger plutonic bodies exposed in south.",null,null,"LH002",113,"Lime Hills","Ign",1292,"Toem"]
["Ttg","Telequana Pass pluton","middle Tertiary","Medium- to coarse-grained , seriate, biotite-hornblende granodiorite having a hypidiomorphic-granular texture.  Originally mapped as part of Merrill Pass pluton, separated because of higher color index and presence of hornblende.",null,"K-Ar discordant biotite (31.9 Ma) and hornblende (36.3 Ma), same sample.","LH002",114,"Lime Hills","Ign",1292,"Toem"]
["Tsf","South Fork stocks","middle Tertiary?","Several small stocks consisting of fine- to medium-grained, seriate to subporphyritic, hypidiomorphic-granular biotite granite.",null,null,"LH002",116,"Lime Hills","Ign",1290,"Toegr"]
["TKm","Goldpan Peak Gabbro","Tertiary or Cretaceous","Small intrusion of fine- to medium-grained to fine- to coarse-grained, seriate, hypidiomorphic granular gabbro.  Intruded by and completely surrounded by Merrill Pass pluton.",null,null,"LH002",117,"Lime Hills","Ign",1670,"TKgb"]
["Tcp","Chilligan Porphyry","Early Tertiary","Chiefly fine- to coarse-grained, biotite- or biotite-hornblende granite or granodiorite, containing alkali feldspar phenocrysts.",null,"K-Ar biotite (60.6 Ma) and hornblende (61.3 Ma), concordant","LH002",118,"Lime Hills","Ign",1320,"Tpgr"]
["Tgl","A-2 Gabbro","Early Tertiary","Dark-colored hornblende and pyroxene-hornblende fine- to medium-grained gabbro.  Two varieties, one foliated (cumulate?) and a non-foliated variety.",null,"40/39 biotite 61.4 Ma","LH002",119,"Lime Hills","Ign",1380,"Tgl"]
["Tse","Unnamed pluton","Tertiary","Medium- to coarse-grained, seriate, hypidiomorphic granular quartz diorite, granodiorite, and granite.",null,"K-Ar biotite 57.5 Ma","LH002",121,"Lime Hills","Ign",1350,"Thgd"]
["TKtp","Tex Peak Mafic intrusion","Tertiary or Cretaceous","Fine-grained, eqigranular, or fine- to medium-grained seriate gabbro.",null,null,"LH002",124,"Lime Hills","Ign",1670,"TKgb"]
["MzPzg","Greenstone","Mesozoic or Paleozoic (Late Triassic?)","Small greenstone body consisting of dark greenish-black, massive, fine-grained equigranular greenstone.  May correlate with Chilikadrotna Greenstone, which has yielded Late Triassic fossils from interbedded limestone.",null,null,"LH002",125,"Lime Hills","Meta",4425,"Trc"]
["TKig","Igitna granodiorite","Tertiary or Cretaceous",null,null,null,"LH002",127,"Lime Hills","Ign",1660,"TKm"]
["Ki","Unnamed stocks","Cretaceous","Fine- medium-grained, seriate to porphyritic quartz monzodiorite.",null,"K-Ar hornblende 79.1 Ma","LH002",128,"Lime Hills","Ign",2470,"Kg"]
["Tsc","Snowcap Central","middle Tertiary","Fine- to medium-grained, seriate, biotite-hornblende granite to granodiorite.",null,"K-Ar biotite (33.5 Ma) and hornblended (35.2 Ma), concordant","LH002",130,"Lime Hills","Ign",1290,"Toegr"]
["Tse","Snowcap East pluton","Tertiary","Pluton ranging from gabbro to granite incomposition, with the more mafic compositions tending to be in the southern part of the exposure.",null,"K-Ar biotite 41.5 and 50.1 Ma, thought reset; 40/39 biotite 64.8 Ma","LH002",131,"Lime Hills","Ign",1320,"Tpgr"]
["Th","Hartman Plutons","Tertiary","Series of 4 elongate plutons, individually ranging from quartz monzonite and quartz monzodiorite to granite.  In general are fine- to medium-grained seriate intrusions, chiefly granodiorite.",null,"K-Ar biotite 64.1 Ma and 40/39 biotite 65.1 Ma","LH002",132,"Lime Hills","Ign",1320,"Tpgr"]
[null,"Jimmy Lake stock","Early Tertiary","Leucocratic biotite granite, part of McKinley sequence?",null,"40/39 biotite 65.0 Ma","LH002",133,"Lime Hills","Ign",1320,"Tpgr"]
["Tme","Mount Estelle pluton","Early Tertiary","Two phases, slightly older and finer grained northern pluton consisting of medium-grained, hypidiomorphic-granular biotite- and hornblende-bearing granodiorite containing tourmaline as a characteristic accessory mineral.  It is largely esposed in the Tyo",null,"K-Ar biotite and hornblende ranging from 62.0 to 64.2 Ma","LH002",134,"Lime Hills","Ign",1350,"Thgd"]
["TKmg","Mount Estelle Gabbro","Tertiary or Cretaceous","Very fine- to fine-grained, sub-equiganular gabbro.",null,null,"LH002",135,"Lime Hills","Ign",1670,"TKgb"]
["Ksp","Sled Pass pluton","Cretaceous","Elongate  fine- to coarse-grained, seriate pluton consisting chiefly of monzonite and monzodiorite.  Locally well-developed cataclastic foliation.",null,"K-Ar hornblende 76.0 Ma and 40/39 biotite 70.1 Ma and hornblende 73.5 to 75.6 Ma","LH002",137,"Lime Hills","Ign",2470,"Kg"]
["Tmr","Mount Rich pluton","Tertiary","Fine- to medium-grained, seriate granodiorite to tonalite.  Presumably intrudes stock of McKinley sequence granite.  Contains subordinate phase is fine- to medium-grained granite.",null,"40/39 biotite 38.6 Ma","LH002",138,"Lime Hills","Ign",1292,"Toem"]
["Tcpi","Crowded Porphyry","Tertiary","Porphyritic hypabyssal intrusive rock containing 40-50 percent phenocrysts.  Phenocrysts are cheifly plagioclase feldspar and subordinate biotite and quartz.  Aphanitic silicieous groundmass",null,null,"LH002",139,"Lime Hills","Ign",1290,"Toegr"]
["Tjc","Johnson Creek pluton","Tertiary","Chiefly fine- to medium-grained seriate to subporphyritic quartz monzodiorite; less common is a porphyritic quartz monzonite phase.  Here inclides? Camp pluton",null,"40/39 biotite 38.6 Ma","LH002",141,"Lime Hills","Ign",1292,"Toem"]
["Tcc","Crystal Creek pluton","Early Tertiary","Large pluton of texturally variable, biotite +/- hornblende granite.",null,"K-Ar biotite 60.0 to 62.0 Ma and hornblende 57.5 to 59.9 Ma.  K-Ar biotite of 52.6 thought reset","LH002",142,"Lime Hills","Ign",1320,"Tpgr"]
["TKkm","Unnamed quartz monzonite pluton","Tertiary or Cretaceous","Fine- to medium-grained seriate quartz monzonite.",null,null,"LH002",144,"Lime Hills","Ign",1655,"TKg"]
["Tsr","Stony River granodiorite","middle Tertiary","Fine- to medium-grained, seriate, hypidiomorphic granular granodiorite to quartz monzodiorite.",null,"40/39 biotite 35.6 and 35.9 Ma","LH002",145,"Lime Hills","Ign",1292,"Toem"]
[null,"Swift River granodiorite","earliest Tertiary or Cretaceous?","Fine- to coarse-grained, seriate, hypidiomorphic granular granodiorite.  Outcrop area surrounded by Tired Pup pluton, thought to be older that Tired Pup.  Is this body mapped separately?",null,null,"LH002",146,"Lime Hills","Ign",null,null]
["TKqc","Quartz Crystal pluton","middle Tertiary?","Fine- to medium-grained, seriate, peralkaline granite to alkali feldspar granite.",null,null,"LH002",147,"Lime Hills","Ign",1270,"Togr"]
["Tv3","Seabee volcanic rocks","Tertiary","Predominantly crystal and crystal-lithic ash-flow tuff and lesser interbedded lava flows and local volcaniclastic sedimentary rocks.",null,"40/39 biotite 36.5 and 41.0 Ma; 40/39 sanidene 37.6 Ma","LH002",150,"Lime Hills","Ign",1070,"Tvr"]
["Tv5","A-2 volcanic rocks","Tertiary?","Chiefly crystal-lithic tuff and lesser volcaniclastic rocks, lava flows, and lahar/debris flows",null,null,"LH002",153,"Lime Hills","Ign",1070,"Tvr"]
["Tv4","Snowcap volcanic rocks","Tertiary","Chiefly crystal-lithic ash-flow tuff and lesser interbedded lava flows and local volcaniclastic sedimentary rocks.",null,"40/39 hornblende 33.6 Ma","LH002",155,"Lime Hills","Ign",1070,"Tvr"]
["Tv1","North volcanic center","Tertiary?","Chiefly crystal-rich ash-flow tuff and lesser lithic-crystal ash-flow tuff and lava flows.  Two lahar deposits have been included in unit as well as a small hypabyssal porphyritic intrusion.  Lithic fragments in tuff are graywacke and argillite derived f",null,null,"LH002",157,"Lime Hills","Ign",1070,"Tvr"]
["Tv2","Styx River Volcanics","Tertiary?","Chiefly crystal-lithic ash-flow tuff and subordinate lava flows and local volcaniclastic rocks south of Jimmy Lake Pass.  Lithic fragments in tuff are chiefly volcanic and sedimentary rock fragments.  Sedimentary rock fragments are graywacke and siltston",null,null,"LH002",158,"Lime Hills","Ign",1070,"Tvr"]
["JKs","Kahiltna terrane","Cretaceous and/or Jurassic","Graywacke and argillite",null,null,"LH002",160,"Lime Hills","Meta",2850,"KJf"]
["MzPzs","Sandstone and graywacke","Mesozoic or Paleozoic","Unit supposed to continue into Lake Clark quadrangle, however no similar unit described in Lake Clark.  Unit assigned to Kakhonak Complex by default",null,null,"LH002",162,"Lime Hills","Meta",5220,"JPzk"]
["TKiu","Intrusive rocks","Tertiary or Cretaceous","Small stocks scattered throughout eastern part of Lime Hills quadrangle.  Composition varies from biotite granite to hornblende-pyroxene quartz diorite.  Texture varies from fine-grained equigranular to fine- to coarse-grained seriate.",null,null,"LH002",170,"Lime Hills","Ign",1650,"TKi"]
["Pzu","Sedimentary rocks (limey)","Paleozoic","Sedimentary rocks. Undifferentiated shale, siltstone, argillite, and limestone.  Fossils, chiefly grapotlites, collected from these rocks are Late Cambrian(?), Ordovician, Silurian, and Devonian in age.  Tentatively correlated with Dilinger sequence of s",null,null,"LH002",190,"Lime Hills","Sed",5310,"DCd"]
["TKgs","Gneiss","Tertiary or Cretaceous","Gneiss, possibly Mesozoic (Mzg)?",null,null,"LH002",195,"Lime Hills","Meta",1720,"TKgg"]
["Tmpb","Merrill Pass breccia","Tertiary",null,null,null,"LH002",199,"Lime Hills","Ign",1290,"Toegr"]
["Qa","Undifferentiated Quaternary surficial deposits","Quaternary",null,null,null,"LH002",200,"Lime Hills","Unconsol",100,"Qs"]
["Qal","Alluvium","Quaternary","Alluvium",null,null,"LH002",202,"Lime Hills","Unconsol",100,"Qs"]
["Qc","Colluvium","Quaternary","Colluvium",null,null,"LH002",203,"Lime Hills","Unconsol",100,"Qs"]
["Qg","Moraine?","Quaternary",null,null,null,"LH002",204,"Lime Hills","Unconsol",100,"Qs"]
["Qao","Outwash?","Quaternary",null,null,null,"LH002",206,"Lime Hills","Unconsol",100,"Qs"]
["Qr","Rock glaciers?","Quaternary","Assigned to Quat, undivided by default",null,null,"LH002",207,"Lime Hills","Unconsol",100,"Qs"]
["Ql","Lacustrine deposits?","Quaternary","Assigned to Quat, undivided by default",null,null,"LH002",208,"Lime Hills","Unconsol",100,"Qs"]
["Ttp","Tired Pup pluton","Early Tertiary","Large granite pluton, part of McKinley sequence.  Chiefly medium- to coarse-grained hypidiomorphic granular biotite- or biotte-hornblende granite.",null,"K-Ar biotite ranging from 40.1 to 59.2 Ma, most credence given to 56.7 to 59.2 Ma ages.","LH002",901,"Lime Hills","Ign",1320,"Tpgr"]
["Tnep","Northeast Prong, Tired Pup pluton","middle Tertiary","Large fine- to coarse-grained seriate, biotite or biotite-amphibole granite pluton.",null,"K-Ar biotite ranging from 25.4 to 26.7 Ma","LH002",902,"Lime Hills","Ign",1270,"Togr"]
["Ttp1","Tired Pup leucogranite","Early Tertiary","Fine- to nearly coarse-grained seriate biotite granite.  Gradational contact with main phase of Tired Pup pluton.",null,null,"LH002",1012,"Lime Hills","Ign",1320,"Tpgr"]
["TKpg","Sled Pass Gabbro","Tertiary or Cretaceous","Small dark-colored , fine- to medium-grained, seriate, hypidiomorphic-granular gabbro intrusion.  Uncertain relationship with Tired Pup pluton",null,null,"LH002",1121,"Lime Hills","Ign",1670,"TKgb"]
["Tiu","Unnamed granitic stocks","middle Tertiary?","Fine- to medium-grained, seriate biotite-hornblende granite intruding 61 Ma gabbro.",null,null,"LH002",1193,"Lime Hills","Ign",1300,"Tegr"]
["Tt","Tlikakila pluton","Tertiary","Small pluton having two phases, quartz diorite and granodiorite.  Quartz diorite is fine- to medium-grained, seriate.  Granodiorite is fine- to medium-grained, subequigranular.",null,"K-Ar biotite 44.6 Ma","LH002",1195,"Lime Hills","Ign",1292,"Toem"]
["Tms","Unnamed McKinley sequence intrusions","Early Tertiary","Leucocratic biotite granite stocks and dike swarms",null,null,"LH002",1335,"Lime Hills","Ign",1320,"Tpgr"]
["Tgd","Necons River pluton","middle Tertiary","Large multiphase pluton consisting of medium- to coarse-grained, seriate, hypidiomorphic granular granite to granodiorite and lesser gabbro.",null,"40/39 biotite 35.6 Ma","LH002",1364,"Lime Hills","Ign",1290,"Toegr"]
["Tgdn","Unnamed plutons","Tertiary or Cretaceous","Gabbro to granite multi-phase bodies",null,"K-Ar biotite on granite 64.0 Ma","LH002",1366,"Lime Hills","Ign",1650,"TKi"]
["Tus","Unnamed stock","Tertiary","Small hypabyssal stock consisting of a silicic(?), biotite and hornblende-bearing porphyry.",null,null,"LH002",1400,"Lime Hills","Ign",1290,"Toegr"]
["Pzu","Sedimentary rocks (limey)","Paleozoic","Sedimentary rocks. Undifferentiated shale, siltstone, argillite, and limestone.  Fossils, chiefly grapotlites, collected from these rocks are Late Cambrian(?), Ordovician, Silurian, and Devonian in age.  Tentatively correlated with Dilinger sequence of s",null,null,"LH003",190,"Lime Hills","Sed",5310,"DCd"]
["bu","Bedrock, unknown",null,"Unknown bedrock units",null,null,"MM002",99,"Mount McKinley",null,99,"bu"]
["Qrf","Recent flood-plain deposits","Quaternary","Recent flood-plain deposits",null,null,"MM002",105,"Mount McKinley","Unconsol",100,"Qs"]
["Qca","Colluvium and older alluvium","Quaternary","Colluvium and other alluvium",null,null,"MM002",107,"Mount McKinley","Unconsol",100,"Qs"]
["Qsm","Superglacial moraine","Quaternary","Superglacial moraine",null,null,"MM002",126,"Mount McKinley",null,100,"Qs"]
["Qrm","Recent moraine","Quaternary","Recent moraine",null,null,"MM002",130,"Mount McKinley",null,100,"Qs"]
["Qom","Older moraine","Quaternary","Older moraine",null,null,"MM002",135,"Mount McKinley",null,100,"Qs"]
["Qw","Glacial outwash deposits","Quaternary","Glacial outwash deposits",null,null,"MM002",140,"Mount McKinley",null,100,"Qs"]
["Tn","Nenana Gravel","Tertiary",null,null,null,"MM002",570,"Mount McKinley","Sed",570,"Tn"]
["Tn?","Nenana Gravel","Tertiary",null,null,null,"MM002",571,"Mount McKinley","Sed",571,"Tn?"]
["Tcs","Cantwell Formation, sedimentary rocks subunit","Tertiary",null,null,null,"MM002",920,"Mount McKinley",null,1920,"Kcs"]
["Tvif","Felsic subvolcanic intrusive rocks","Tertiary",null,null,null,"MM002",1011,"Mount McKinley","Ign",1011,"Thf"]
["Tvim","Mafic subvolcanic intrusive rocks","Tertiary",null,null,null,"MM002",1012,"Mount McKinley","Ign",1012,"Thm"]
["Tvg","Mount Galen Volcanics","Tertiary","See Gilbert, W.G., 1979, A geologic guide to Mount McKinley National Park:  Alaska Natural History Association.",null,"Age of 38 Ma reported","MM002",1000,"Mount McKinley","Ign",1081,"Tvb"]
["Tgr","Tertiary granitic rocks","Tertiary","McGonagall pluton",null,null,"MM002",1305,"Mount McKinley","Ign",1292,"Toem"]
["Tgr","Tertiary granitic rocks","Tertiary","McGonagall pluton",null,null,"MM002",1307,"Mount McKinley","Ign",1292,"Toem"]
["Tgr","Tertiary granitic rocks","Tertiary","Eielson pluton",null,null,"MM002",1308,"Mount McKinley","Ign",1292,"Toem"]
["Tgr","Tertiary granitic rocks","Tertiary","Wyoming Hills pluton",null,null,"MM002",1309,"Mount McKinley","Ign",1292,"Toem"]
["Tgr","Tertiary granitic rocks","Tertiary","Biotite and hornblende granodiorite, Foraker pluton",null,null,"MM002",1306,"Mount McKinley","Ign",1292,"Toem"]
["Tgr","Tertiary granitic rocks","Tertiary","Biotite and biotite-muscovite granite, McKinley sequence, McKinley pluton",null,null,"MM002",1335,"Mount McKinley","Ign",1320,"Tpgr"]
["Tgr","Tertiary granitic rocks","Tertiary","Biotite and biotite-muscovite granite, McKinley sequence, Ruth pluton",null,null,"MM002",1336,"Mount McKinley","Ign",1320,"Tpgr"]
["TKv","Volcanic rocks","Tertiary and Cretaceous","Felsic to intermediate volcanic rocks",null,null,"MM002",1607,"Mount McKinley","Ign",1603,"TKvr"]
["TKgr","Granitic rocks of Tertiary and (or) Cretaceous age","Tertiary and (or) Cretaceous","Granitic rocks",null,null,"MM002",1655,"Mount McKinley","Ign",1655,"TKg"]
["gr","Granitic rocks of uncertain composition and age","Unknown, probable Tertiary or Cretaceous","Granitic rocks of uncertian composition and age",null,null,"MM002",1599,"Mount McKinley","Ign",1650,"TKi"]
["KJf","Flyschlike rocks","Jurassic or Cretaceous","Flyschlike rocks",null,null,"MM002",2850,"Mount McKinley","Sed",2850,"KJf"]
["Trcs","Calcareous sedimentary rocks","Triassic","Calcareous rocks",null,null,"MM002",4033,"Mount McKinley","Sed",4033,"Trcs"]
["Trbd","Basalt, diabase, and subordinate sedimentary rocks","Triassic","Basalt, diabase, and subordinate sedimentary rocks",null,null,"MM002",4025,"Mount McKinley","Ign",4423,"Trn?"]
["Trps","Flyschlike sedimentary rocks","Triassic and Paleozoic","Flyschlike sedimentary rocks",null,null,"MM002",5040,"Mount McKinley","Sed",5040,"TrPas"]
["JTrrs","Red and brown sedimentary rocks and basalt","Jurassic and Triassic","Red and brown sedimentary rocks and basalt",null,null,"MM002",4060,"Mount McKinley","Sed",4060,"Trr"]
["Trlb","Limestone and basalt sequence","Triassic","Limestone and basalt sequence",null,null,"MM002",4021,"Mount McKinley","Sed",4021,"Trlb"]
["DSl","Reefy limestone and dolomite","Devonian and Silurian","Reefy limestone and dolomite",null,null,"MM002",6960,"Mount McKinley","Sed",6960,"DSwc"]
["DOc","Chert and slate","Devonian and Ordovician","Chert and slate",null,null,"MM002",7550,"Mount McKinley","Sed",7710,"Och"]
["Pzc","Chert and phyllite","Paleozoic","Chert and phyllite",null,null,"MM002",5650,"Mount McKinley","Sed",5310,"DCd"]
["MDt","Totatlanika Schist","Mississippian and Devonian","Totatlanika Schist",null,null,"MM002",6510,"Mount McKinley","Meta",6510,"MDt"]
["Pzk","Keevy Peak Formation","Paleozoic","Keevy Peak Formation",null,null,"MM002",5660,"Mount McKinley","Sed",5660,"Pzk"]
["Pzsc","Spruce Creek sequence","Paleozoic","Spruce Creek sequence of Kantishna Hills from Bundtzen thesis",null,null,"MM002",5666,"Mount McKinley","Sed",5666,"Pzsc"]
["Pzc?","Chert and phyllite","Paleozoic","Chert and phyllite",null,null,"MM002",5651,"Mount McKinley","Sed",5370,"JCmd"]
["DSu","Sedimentary rocks, undifferentiated","Devonian","Undifferentiated sedimentary rocks, same as unit Dmf, Dmb, Dms of Csejtey (1992, HE002)",null,null,"MM002",7290,"Mount McKinley","Meta",7290,"Pzsc"]
["DSu?","Sedimentary rocks, undifferentiated","Devonian","Undifferentiated sedimentary rocks, same as unit Dmf, Dmb, Dms of Csejtey (1992, HE002)",null,null,"MM002",7291,"Mount McKinley","Meta",7291,"Pzsc?"]
["DOs","Sedimentary sequence","Devonian and Ordovician","Sedimentary sequence",null,null,"MM002",6970,"Mount McKinley","Sed",5370,"JCmd"]
["DOs?","Sedimentary sequence","Devonian and Ordovician","Sedimentary sequence",null,null,"MM002",6972,"Mount McKinley","Sed",5370,"JCmd"]
["DOls","Sedimentary sequence, limestone interbeds","Devonian and Ordovician","Sedimentary sequence, massive limestone interbeds",null,null,"MM002",6971,"Mount McKinley","Sed",6615,"DSmdl"]
["DSb","Serpentinite, basalt, chert, and gabbro","Devonian","Serpentinite, basalt, chert, and gabbro",null,null,"MM002",7325,"Mount McKinley","Meta",7325,"Dmgs"]
["PzpCp","Pelitic and quartzose schist sequence","Paleozoic and preCambrian?","Pelitic and quartzose schist sequence",null,null,"MM002",8630,"Mount McKinley","Meta",9322,"PzZaqs"]
["PzpCp?","Pelitic and quartzose schist sequence","Paleozoic and preCambrian?","Pelitic and quartzose schist sequence",null,null,"MM002",8633,"Mount McKinley","Meta",8633,"PzZaqs"]
["PzpCs","Sheared grit, quartzite, and quartz-mica schist","Paleozoic and preCambrian?","Sheared grit, quartzite, and quartz-mica schist",null,null,"MM002",8641,"Mount McKinley","Meta",8300,"CZw"]
["PzpCq","Quartzite, grit, and argillite","Paleozoic and preCambrian?","Quartzite, grit, and argillite",null,null,"MM002",8640,"Mount McKinley","Meta",8300,"CZw"]
["TKd","Dike swarm","Tertiary or Cretaceous","Two areas of dike swarms consisting of felsic and mafic (southern area) or felsic (northern area) dikes.",null,null,"LH002",219,"Lime Hills","Ign",1602,"TKgp"]
["Qs","Surficial deposits","Holocene and Pleistocene","Surficial deposits",null,null,"TY002",100,"Tyonek","Unconsol",100,"Qs"]
["Qs","Surficial deposits","Quaternary","Includes alluvium, talus, rock glaciers, and various morainal deposits.  Bedrock outcrops are present in ravines and along cut banks of rivers",null,null,"TY003",100,"Tyonek","Unconsol",100,"Qs"]
["Qv","Volcanic rocks","Quaternary (with mixed Tertiary?)","Lava, breccia, and associated pyroclastics.  May include Tertiary volcanic rocks",null,null,"TY002",103,"Tyonek","Ign",300,"Qv"]
["Tv","Volcanic rocks","Tertiary (with mixed Quaternary?)","Basaltic lava, tuff, and breccia.  May include Quaternary volcanic rocks",null,null,"TY002",105,"Tyonek","Ign",450,"QTv"]
["Tkb","Beluga Formation","Miocene","Sandstone, siltstone, and coal",null,null,"TY002",108,"Tyonek","Sed",545,"Tkb"]
["Tk","Kenai Group","Tertiary","Sandstone, conglomerate, clay, and coal",null,null,"TY004",163,"Tyonek","Sed",560,"Tk"]
["Tkt","Tyonek Formation","Miocene and Oligocene","Sanstone, siltstone, coal, and conglomerate",null,null,"TY002",106,"Tyonek","Sed",600,"Tty"]
["Twf","West Foreland Formation","Eocene and Paleocene","Conglomerate, sandstone, and siltstone; mostly tuffaceous",null,null,"TY002",107,"Tyonek","Sed",855,"Twf"]
["Tv","Volcanic rocks","Tertiary","Undifferentiated volcanic mafic and felsic flows, tuff flow breccias",null,null,"TY003",144,"Tyonek","Ign",1000,"Tvu"]
["Tsxr","Styx River Batholith","Tertiary","Biotite granite and quartz monzonite.  Weathers light brown to dark yellowish orange.  Intrudes the Mount Estelle intrusive and granodiorite of the Nagshlamina River",null,null,"TY003",142,"Tyonek","Ign",1270,"Togr"]
["Tg","Granite and granodiorite","Late Paleocene to Early Eocene","Granite, granodiorite, diorite, and minor quartz monzonite",null,"55 and 61 Ma","TY004",160,"Tyonek","Ign",1300,"Tegr"]
["Tg","Granitic rocks","Tertiary","Granite, quartz monzonite, and syenite",null,"K-Ar data:  Five dates from Biotite: 59.0+2.4 m.y.; 58.3+1.7 m.y.; 56.5+1.6 m.y.; 57.0+1.7 m.y.; and 58.2 m.y.  One date from Hornblende: 58.7+1.8 m.y.","TY002",110,"Tyonek","Ign",1320,"Tpgr"]
["Tc","Chilligan River Pluton","Tertiary","Medium-grained porphyritic biotite-hornblende quartz monzonite and granodiorite.  Phenocrysts of K-feldspar",null,null,"TY003",145,"Tyonek","Ign",1320,"Tpgr"]
["Tgd","Granodioritic rocks","Tertiary","Granodiorite and quartz diorite",null,"K-Ar data:  One date from Biotite: 60.8+1.8 m.y.  One date from Hornblende: 61.9+1.8 m.y.","TY002",109,"Tyonek","Ign",1350,"Thgd"]
["Tme","Mount Estelle Pluton","Tertiary","Medium grained hornblende-biotite granodiorite and quartz monzonite",null,null,"TY003",140,"Tyonek","Ign",1350,"Thgd"]
["Tn","Granodiorite of the Nagishlamina River","Tertiary","Medium-grained hornblende-biotite granodiorite",null,null,"TY003",143,"Tyonek","Ign",1350,"Thgd"]
["TKft","Felsic Tuff","Early Tertiary or Cretaceous","Crystaline tuff and lapilli tuff",null,null,"TY004",164,"Tyonek","Ign",1615,"TKv"]
["TKi","Unassigned intrusive rock","Cretaceous or Tertiary","Undifferentiated felsic and mafic intrusive rocks",null,null,"TY003",139,"Tyonek","Ign",1650,"TKi"]
["TKi1","Unassigned intrusive rocks","Cretaceous or Tertiary","Chiefly granite and quartz monzonite.  Rocks east of Skwenta River and south of Merrill Pass may be equivalent to Styx River batholith",null,null,"TY003",141,"Tyonek","Ign",1655,"TKg"]
["TKgd","Granodioritic rocks","Tertiary and Cretaceous","Granodiorite, quartz diorite, and diorite",null,"K-Ar data:  Three dates from Biotite: 62.9+1.8 m.y.; 70.9 m.y.; 62.6+1.8 m.y.  Four dates from Hornblende: 72.0 m.y.; 68.6+2.1 m.y.; 72.1 m.y.; 64.8+1.9 m.y.","TY002",113,"Tyonek","Ign",1660,"TKm"]
["Ks",null,"Early and Late Cretaceous","Sandstone, siltstone, conglomerate, cherty argillite, and limestone",null,null,"TY004",161,"Tyonek","Sed",1800,"Ksu"]
["Kb","Cretaceous basalt","Cretaceous","Dark green and gray aphanitic basalt with local pillow forms",null,null,"TY004",162,"Tyonek","Ign",2230,"Kve"]
["Kg","Granitic rocks","Cretaceous","Quartz monzonite and syenite",null,"K-Ar data:  One date from Hornblende: 107+3.2 m.y.","TY002",116,"Tyonek","Ign",2530,"Kg"]
["Kw","Metasedimentary rocks","Cretaceous (?)","Feldspathic wacke with interbeds of siltstone.  Locally calcareous.  Weathers reddish brown",null,null,"TY003",135,"Tyonek","Meta",2825,"KJfm"]
["KJu","Metasedimentary rocks (undivided)","Cretaceous and (or) Jurassic","Weakly metamorphosed slate and graywacke; locally includes volcanic and intrusive rocks, undivided",null,null,"TY002",115,"Tyonek","Sed",2850,"KJf"]
["Km","Metasedimentary rocks","Cretaceous (?)","Undifferentiated metasedimentary rocks.  Slate, graywacke, siltstone, argillite and phyllite, andalusite schist near contact with Hartman River intrusives.  Medium to dark gray.  Locally red weathering feldspathic wacke (Kw)",null,null,"TY003",136,"Tyonek","Meta",2850,"KJf"]
["Jtk","Talkeetna Formation","Early Jurassic","Volcanic breccia, tuff, agglomerate, and aphanitic lava flows; as mapped, locally includes Kamishak Formation in Ilianna Quad",null,null,"TY002",151,"Tyonek","Ign",3250,"JTrtk"]
["Mzv","Metavolcanic and Metasedimentary rocks","Mesozoic","Predominantly metavolcanic rocks of pre-Cretaceous age.  Chiefly metabasalts and metaandesites.  May be equivalent to the Talkeetna Formation.  Locally includes subordinate metasedimentary rocks",null,null,"TY003",151,"Tyonek","Meta",3250,"JTrtk"]
["Trk","Kamishak Formation","Late Triassic","Limestone, grey to black chert, and porcellanite",null,null,"TY002",4020,"Tyonek","Sed",4020,"Trk"]
["Trl","Limestone and fine-grained tuff","Late Triassic","Limestone and fine-grained tuff",null,null,"TY002",4025,"Tyonek","Sed",4025,"Trlst"]
["Trc","Chert and some greenstone","Late Triassic","Chert and some greenstone",null,null,"TY002",4035,"Tyonek","Sed",4035,"Trcg"]
["Mzi","Unassigned intrusive rocks","Mesozoic","Chiefly sphene-bearing quartz diorite and diorite",null,null,"TY003",154,"Tyonek","Ign",4800,"Mzi"]
["Mzm","Unassigned mafic rocks","Mesozoic","Chiefly diorite and olivine and/or hornblende gabbro.  Occurs as inclusions in Tertiary intrusive rocks.  Locally may be metamorphosed equivalent of unit Mzi",null,null,"TY003",153,"Tyonek","Ign",4880,"Mzm"]
["Mzs","Metavolcanic and Metasedimentary rocks","Mesozoic","Predominently metasedimentary rocks of pre-Cretaceous age.  Locally includes subordinate metavolcanic rocks.  Locally includes metasedimentary rocks (Km) of Cretaceous age",null,null,"TY003",152,"Tyonek","Meta",4905,"JPzk"]
["Mzu","Metavolcanic and Metasedimentary rocks","Mesozoic","Undifferentiated metavolcanic and metasedimentary rocks of pre-Cretaceous age.  Locally may include metasedimentary rocks (Km) of Cretaceous age",null,null,"TY003",150,"Tyonek","Meta",4920,"JPzk"]
["Q","Surficial materials, undivided","Quaternary","Includes stream alluvium, colluvial deposits, terrace gravel, eolian deposits, and glacial deposits",null,null,"TN003",100,"Tanana","Unconsol",100,"Qs"]
["Ts","Sedimentary rocks, undivided","Tertiary, Eocene","Interbedded polymictic pebble-cobble-boulder conglomerate, grit, and sandstone, with siltstone, shale, and lignite.",null,null,"TN003",640,"Tanana","Sed",640,"Tcb"]
["Tv","Volcanic rocks, undivided","Paleocene to Eocene","Bimodal assemblage of rhyolite and banded rhyolite flow rocks, rhyolitic breccia, tuffaceous sedimentary rocks, and amygdaloidal basalt flow rocks.",null,null,"TN003",1001,"Tanana","Ign",1001,"Trs"]
["TKv","Volcanic rocks","Late Cretaceous to Early Tertiary","See unit TKV, TN002",null,null,"TN003",1604,"Tanana","Ign",1604,"TKvd"]
["TKg","Granitic rocks, undivided","Late Cretaceous to Early Tertiary","Light- to vey light-gray quartz monzonite, may range to granite.",null,"K-Ar(?) 61.8 Ma","TN003",1655,"Tanana","Ign",1655,"TKg"]
["Kwc","Wilber Creek unit of Weber and others (1992)","Early Cretaceous","Interlayered siltstone, shale, snadstone, and conglomerate.  Impure graywacke rich in volcanic detritus is locally characteristic and probably correlates with the Kathul Graywacke of the Charley River quadrangle.",null,null,"TN003",2115,"Tanana","Sed",2115,"Kwcf"]
["Kg","Granitic rocks, undivided","Cretaceous?","Ray Mountains pluton and part of another large pluton at north central edge of quadrangle.  Quartz monzonite, granite, monzonite, and possibly granodiorite.",null,null,"TN003",2470,"Tanana","Ign",2410,"Kg"]
["Kg","Granitic rocks, undivided","Cretaceous?","Part of Melozitna pluton.  Quartz monzonite, granite, monzonite, and possibly granodiorite.",null,null,"TN003",2471,"Tanana","Ign",2530,"Kg"]
["TKg","Granitic rocks","Cretaceous or Tertiary","Granitic rocks of uncertain composition, texture, and age; may be equivalent to KG unit of Melozitna quadrangle (MZ002)",null,null,"TN003",2480,"Tanana","Ign",2460,"Kg"]
["KJw","Wolverine quartzite unit of Weber and others (1992), undivided","Early Cretaceous and or Jurassic","Light-gray quartzite and dark-gray, cleaved, subphyllitic argillite and shale, part of unit KJcs of Chapman and others.",null,null,"TN003",2815,"Tanana","Sed",2815,"KJw"]
["KJwq","Wolverine quartzite unit of Weber and others (1992), quartzite","Early Cretaceous and or Jurassic","Light-gray  to tan, white weathering, massive-bedded, moderately well-sorted, subrounded fine- to medium-grained quartzarenite.  Correlative with Keenan Quartzite of Charley River quadrangle according to Dover but I wonder if this is the wrong unit and i",null,null,"TN003",2816,"Tanana","Sed",2816,"KJw"]
["KJwa","Wolverine quartzite unit of Weber and others (1992), sandstone and shale","Early Cretaceous and or Jurassic","Dominantly gray o black argillaceous rocks containing interbeds of Wolverine-type quartzarenite.",null,null,"TN003",2817,"Tanana","Sed",2817,"KJw"]
["Jsc","Serpentinite and or carbonatite","Jurassic?","Serpentinite, diabase-gabbro and some metadiorite and magnetite-rich",null,null,"TN003",3495,"Tanana","Ign",5190,"MzZum"]
["JMr","Rampart Group and associated mafic intrusive rocks, undivided","Mississippian to Jurassic","Rampart Group volcanic and sedimentary rock sequence",null,null,"TN003",5020,"Tanana","Ign",5020,"TrMts"]
["JMbc","Basalt and chert","Mississippian to Jurassic?","Dominantly basalt, altered basalt, and subordinate diabase and a low-grade cataclastic assemblage of generally dark gray chert and silicieous argillite.  Also subordinate volcaniclastic rocks and minor Mississippian limestone",null,null,"TN003",5140,"Tanana","Ign",5140,"JMab"]
["Pzm","Mafic rocks","Paleozoic?","Metamorphosed mafic igneous rocks, ranging from metagabbro and metadiabase to greenstone, amphibolite, and garnet amphibolite. (Shown on source map compilation as unit Pzg)",null,null,"TN003",5141,"Tanana","Meta",5285,"Pzrmi"]
["JMu","Mafic and ultramafic rocks, undivided","Jurassic?","Massive and layered gabbro, leucogabbro, harzburgite, garnet amphibolite, serpentinized peridotite, and dunite",null,null,"TN003",5150,"Tanana","Ign",5150,"Jaum"]
["Pzsr","Schist of Ruby and Garnet Creeks area","Paleozoic?","Polymetamorphic staurolite-garnet-schist containing subordinate quartzite, and hornblede amphibolite",null,null,"TN003",5208,"Tanana","Meta",5208,"TPza"]
["Pzl","Metalimestone and marble","Paleozoic?","Metalimestone and marble",null,null,"TN003",5525,"Tanana","Meta",5525,"Dm"]
["TrPs","Sedimentary rocks, undivided","Permian to Triassic","Dominantly dark-gray, typically phyllitic, silicieous to carbonaceous argillite and shale, having subordinate but characteristic clast-supported chert-rich conglomerate, greenish-gray chert, tuffaceous volcaniclastic rocks, yellowish- to reddish-brown hi",null,null,"TN003",5740,"Tanana","Sed",5012,"TrPs"]
["Ml","Limestone","Mississippian","Gray, bioclastic limestone, found in structurally isolated thrust slice  Not on OFR98-133",null,null,"TN003",6330,"Tanana","Sed",6944,"DSl"]
["Dao","Augen orthogneiss","Devonian","Augen most commonly of white potassium feldspar, range in size from 1 to 10 cm long, most about 4 cm long.  Biotite is scarce to abundant.  Foliation layers containing biotite bend around augen.",null,null,"TN003",6520,"Tanana","Meta",6522,"MDrao"]
["Mq","Globe quartzite","Mississippian","Vitreous quartzite associated with gabbro sills and dikes.  Light-gray quartzite.  Massive or thinly interbedded quartzite and medium- to dark-gray slate, phyllite, and minor laminated claystone.  Age from date of Trm intrusive and lithologic and stratig",null,null,"TN003",6530,"Tanana","Meta",6530,"Mgq"]
["pCa","Amy Creek unit of Weber and others (1992)","Late Proterozoic? to early Cambrian?, Devonian?","White, massive, locally laminated, unfossiliferous cherty dolostone characterized by replacement silica boxwork locally and gray limestone at top and bottom of section.  Possible other correlations suggest this unit is equivalent to unit Dld of this quad",null,null,"TN003",6680,"Tanana","Sed",6680,"SZa"]
["Dld","Limestone and dolomite","Latest Devonian (Famennian)","Light- to medium-gray or tan marker units of sandy, platy limestone and massive-bedded silicified limestone and dolostone having extensive locally developed boxwork silica.  Not on OFR98-133","Platy limestone and a limestone bed thought to be part of the section contains sparse conodonts of Famennian age.",null,"TN003",6905,"Tanana","Sed",6944,"DSl"]
["Dlr","Limestone of Raven Ridge","Late Devonian?","Gray micritic limestone and brecciated limestone.","Undescribed megafossils",null,"TN003",6931,"Tanana","Sed",6944,"DSl"]
["Pzmr","Marble","Paleozoic?","Distinctive marker bed of coarsely recrystallized marble within Pzsr unit",null,null,"TN003",6955,"Tanana","Meta",6955,"Dlc"]
["Ofc","Fossil Creek Volcanic unit of Weber and others (1992)","Ordovician","Agglomeratic mafic volcanic rocks, volcaniclastic rocks, and assoiciated argillaceous sedimentary rocks",null,null,"TN003",7610,"Tanana","Ign",7610,"Ofc"]
["Pzlc","Livengood Dome Chert?","Ordovician","Heterogeneous, low-grade, blastomylonitic assemblage of silicieous to cherty argillite, recrystallized chert, intermediate to mafic volcaniclastic rocks and greenstone, graywacke, grit, and oolitic limestone.  Resembles lower grade parts of unit Pzs in t",null,null,"TN003",7712,"Tanana","Meta",7710,"Och"]
["Pzll","Limestone","Paleozoic?","Distinctive marker bed of lime mudstone, locally characterized by coated ooids; is part of Livengood Dome Chert",null,null,"TN003",7711,"Tanana","Sed",7711,"Oldl"]
["pCw","Wickersham unit of Weberr and others (1992), undivided","Cambrian and or Late Proterozoic","Poorly sorted quartzite and grit, having abundant quartz and plagioclase clasts in a quartzofeldspathic-wacke matrix.",null,null,"TN003",8410,"Tanana","Meta",8300,"CZw"]
["Pzs","Schist","Paleozoic?","Low to  moderately high-grade, blastomylonitic, polymetamorphic assemblage of pelitic to quartzitic schist containing subordinate layers of quartzo-feldspathic schist, calc-schist, calc-sliciate gneiss, amphibolitic schist, quartzite, marble, and metacon",null,null,"TN003",8630,"Tanana","Meta",9325,"PzZrqs"]
["Pzq","Quartzite","Paleozoic?","Relatively pure quartzite units locally mappable and typically associated with mafic rocks (unit Pzm) and metalimestone and marble (unit Pzl).  (Shown on source map compilation as uncolored Pzqs)",null,null,"TN003",8640,"Tanana","Meta",9325,"PzZrqs"]
["PzpCqg?","Quartzofeldspathic orthogneiss","Late Proterozoic? and or Paleozoic?","Quartzofeldspathic orthogneiss, located only on west side of Ray Mountains pluton.",null,null,"TN003",8800,"Tanana","Meta",8801,"PzZrpg"]
["Olc","Livengood Dome Chert","Ordovician","Separate from Pzlc which was described as:  Heterogeneous, low-grade, blastomylonitic assemblage of silicieous to cherty argillite, recrystallized chert, intermediate to mafic volcaniclastic rocks and greenstone, graywacke, grit, and oolitic limestone.",null,null,"TN003",7710,"Tanana","Meta",7710,"Och"]
["TKhf","Hornfels and skarn","Cretaceous and Paleocene","Brown to gray, massive to locally porphyroblastic, garnet-chlorite-biotite hornfels derived from carbonate and clastic rocks.  Assigned to unit of provenence",null,null,"MG002",0,"McGrath","Meta",null,null]
["Qg","Active Glaciers","Pleistocene and Holocene","Occupy cirques with base level above 4,800 to 6,100 ft elevation",null,null,"MG002",101,"McGrath","Unconsol",101,"g"]
["Qa","Stream Alluvium, undifferentiated","Holocene","Fluvial silt, sand, and gravel deposited by streams in floodplains, fans, and meandering to distributary stream channel deposits",null,null,"MG002",100,"McGrath","Unconsol",100,"Qs"]
["Qat","Terrace Alluvium","Wisconsin to early Holocene","Moderately to well sorted, well stratified, gray to tan (oxidized), fluvial silt, sand, and gravel of varying ages deposited on former floodplains that now lie above or beyond the normal depositional regime of Holocene streams.",null,null,"MG002",110,"McGrath","Unconsol",100,"Qs"]
["Qaf","Alluvial-fan deposits","Late Wisconsin to Holocene","Poorly to moderately well sorted, gray to tan (oxidized), fluvial silt, sand, and gravel deposited where first- and second-order tributaries join third- and fourth-order streams",null,null,"MG002",105,"McGrath","Unconsol",100,"Qs"]
["Qca","Colluvial-alluvial deposits","Holocene","Mixed or alternating, poorly to moderately sorted, silt, sand, gravel, and diamicton of colluvial and alluvial origins",null,null,"MG002",115,"McGrath","Unconsol",100,"Qs"]
["Qct","Talus","Holocene","Angular, unsorted debris derived from frost riving of bedrock followed by rapid gravity transport on steep slopes, cirque headwalls, steep gullies, and avalanche chutes",null,null,"MG002",120,"McGrath","Unconsol",100,"Qs"]
["Qcl","Landslide deposits","Holocene","Chaotically deformed colluvium derived from relatively sudden mass movement of bedrock or surficial deposits along a plane of failure.  Hummocky and usually frozen",null,null,"MG002",125,"McGrath","Unconsol",100,"Qs"]
["Qe","Eolian deposits","Holocene","Well-sorted sand and silt transported and deposited by wind.  Usually frozen",null,null,"MG002",135,"McGrath","Unconsol",100,"Qs"]
["Qsp","Silt and Peat","Late Wisconsin to Holocene","Poorly stratified, black to brown, organic rich, alluvial, eluvial, lacustrine, and bog silt and peat.  Usually frozen, except near stream cuts",null,null,"MG002",130,"McGrath","Unconsol",100,"Qs"]
["Qdic","Ice-contact deposits","Wisconsin and early Holocene","Stratified gravel, sand, and flowtill deposited on, against, or under stagnant masses of glacial ice by meltwater streams",null,null,"MG002",165,"McGrath","Unconsol",100,"Qs"]
["Qdt","Till, undifferentiated","Late Wisconsin and Holocene","Unsorted to poorly sorted clay, silt, sand, and gravel deposited by glacial ice",null,null,"MG002",170,"McGrath","Unconsol",100,"Qs"]
["Qrg","Rock Glaciers and Rock-Glacier deposits","Holocene","Unsorted, angular, frost-shattered cobbles and boulders, commonly containing considerable intersticial ice.  Usually frozen.",null,null,"MG002",145,"McGrath","Unconsol",100,"Qs"]
["Qdtf","Till of Farewell Glaciation","Wisconsin","Unsorted to poorly sorted clay, silt, gravel, and boulders deposited by glacial ice as ground, terminal, and lateral moraines.  Mostly the result of Farewell I and Farewell II glaciations",null,null,"MG002",175,"McGrath","Unconsol",100,"Qs"]
["Qdo","Outwash","Wisconsin","Stratified drift consisting of coarse subrounded gravel that contains sand and silt lenses deposited by sideglacial and proglacial meltwater streams.  Usually frozen",null,null,"MG002",155,"McGrath","Unconsol",100,"Qs"]
["Qdot","Outwash Terrace","Early to middle Pleistocene","Remnant of former outwash fan or plain deposit (Qof)",null,null,"MG002",160,"McGrath","Unconsol",100,"Qs"]
["Qdts","Till of Selatna GLaciation","Pleistocene","Unsorted to poorly sorted clay, silt, and gravel deposited by glacial ice in ground moraines",null,null,"MG002",180,"McGrath","Unconsol",100,"Qs"]
["Qdtlm","Till of Lone Mountain Glaciation","Early or middle (?) Pleistocene","Isolated patches of unsorted to poorly sorted silt, gravel, and highly eroded erratics deposited by glacial ice",null,null,"MG002",185,"McGrath","Unconsol",100,"Qs"]
["Qof","Outwash-fan deposits","Middle Pleistocene to early Wisconsin","Glaciofluvial sand and silt derived from streams originating near ancestral glacial margins.  Usually frozen",null,null,"MG002",150,"McGrath","Unconsol",100,"Qs"]
["Qdtplm","Till of Pre-Lone Mountain Glaciation","Pliocene and Pleistocene","Isolated patches of unconsolidated to weakly cemented, diamicton largely recemented by calcite-forming tillite.  May correlate with deformed till and outwash (QTg)",null,null,"MG002",190,"McGrath","Unconsol",100,"Qs"]
["QTg","Consolidated Till and Outwash","Pliocene and Pleistocene","Weakly to well cemented diamicton, interbedded with crudely stratified outwash, with local and exotic lithologies",null,null,"MG002",195,"McGrath","Sed",100,"Qs"]
["Thf","Hornfels and skarn","Paleocene to Oligocene","Brown to gray, massive to locally porphyroblastic, garnet-chlorite-biotite hornfels derived from carbonate and clastic rocks.  Assigned to unit of provenence",null,null,"MG002",0,"McGrath","Meta",null,null]
["Tcf","Felsite Conglomerate","Oligocene and Miocene","Thick-bedded, poorly indurated, orange-weathered, light brown granule, cobble conglomerate with clasts of felsic igneous rocks.",null,null,"MG002",200,"McGrath","Sed",500,"Tsu"]
["Tcg","Coal-bearing sandstone, shale, and conglomerate","Late Paleocene (?) to Oligocene","Thin- to thick-bedded, poorly to moderately indurated, buff-weathered, gray-brown, granule to cobble conglomerate, minor sandstone, and interbedded dark gray carbonaceous shale and coal.  Correlated with Ts",null,null,"MG002",205,"McGrath","Sed",640,"Tcb"]
["Ts","Sandstone and shale","pre-Middle Eocene","Thin- to thick-bedded, moderately indurated, red-brown weathered, buff, medium-grained, lithoquartzose sandstone interbedded with poorly indurated, laminated, fissile, carbonaceous shale and fine sandstone.  Correlated with Tcg",null,null,"MG002",210,"McGrath","Sed",500,"Tsu"]
["Tcl","Limestone conglomerate","Late Paleocene (?) to Oligocene","Thick- to thin-bedded, moderately indurated, green-gray granule conglomerate exposed in fault sliver near Khuchaynik Creek.  Although it is compositionally distinct, it crops out near Ts and Tcg, and is correlated with them",null,null,"MG002",215,"McGrath","Sed",500,"Tsu"]
["Tvs","Volcaniclastic sandstone and lacustrine silt","Eocene","Brown to gray, medium- to fine-grained volcaniclastic sandstone that has a distinctive 50 ft thick section of flora-rich paleosols and finely laminated, varved shales of probable lacustrine origin aqsscoiated with the Ship Creek, Windy Fork, and Terra Co","Metasequoia cuneata and Glyptostrobus europaeus (plant fossils)",null,"MG002",220,"McGrath","Sed",880,"Tfv"]
["Tva","Andesite flows and lapilli tuff","Paleocene and Eocene","Dark-gray to green-gray andesite flows and locally banded (red, green, purple, bleached) lapilli tuff.  Groundmass is aphanitic to fine-grained of Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,"Whole-rock K/Ar age of 37.1 Ma from Windy Fork volcanic field","MG002",230,"McGrath","Ign",1081,"Tvb"]
["Tvvd","Vent facies dacite","Eocene and Oligocene","Very distinctive, light gray, distinctively tan weathering, hornblende and potassium-feldspar-rich, propylitically altered dacite containing very abundant angular clasts of sedimentary rocks of Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields;",null,null,"MG002",245,"McGrath","Ign",1081,"Tvb"]
["Tvlr","Lapilli rhyodacite","Eocene and Oligocene","Light- to medium-gray, porphyro-aphanitic, potassium-feldspar-rich rhyodacite flows containing conspicuous layers of purple, green, and red lapilli tuff beds.  Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,null,"MG002",255,"McGrath","Ign",1081,"Tvb"]
["Tvgt","Green tuff","Oligocene","Distinctly mid- to dark-green, fine to medium grained ash flow (?) tuff containing very minor blocks of darker green, altered agglomerate composed of rounded clasts.  Marker bed for Terra Cotta volcanic field.  Ship Creek, Windy Fork, and Terra Cotta Vol",null,null,"MG002",260,"McGrath","Ign",1081,"Tvb"]
["Tvl","Lahar deposits","Eocene","Medium- to dark-green-gray, very coarse grained lahar deposit.  Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,null,"MG002",265,"McGrath","Ign",1081,"Tvb"]
["Tvf","Felsic tuff and flows","Eocene and Oligocene","Bleached to light-gray, locally banded, hypocrystalline rhyolite tuff and flows.  Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,null,"MG002",270,"McGrath","Ign",1081,"Tvb"]
["Tvm","Basalt and basaltic andesite","Paleocene and Eocene","Dark gray to maroon, locally porphyritic, columnar jointed, olivine bearing, augite basalt and basaltic andesite flows.  Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields;",null,"Four K/Ar ages ranging from 41.3 Ma to 48.9 Ma from the Ship Creek volcanic field","MG002",275,"McGrath","Ign",1081,"Tvb"]
["Tid","Undifferentiated sills and dikes","Eocene to Miocene","Undifferentiated sills and dikes of mafic and felsic composition",null,null,"MG002",435,"McGrath","Ign",1010,"Thf"]
["Tia","Andesite-trachyandesite sills and dikes","Eocene to Miocene","Green-gray, fine-grained, hypidiomorphic-granular, porphyritic andesite dikes less than 65 ft thick.  Local variety-granodiorite",null,"Five K/Ar ages from 20.9 to 39.3 Ma","MG002",420,"McGrath","Ign",1011,"Thf"]
["Tif","Felsic sills and dikes","Eocene to Miocene","Felsic (light pinkish tan to white), aphanitic- to fne-grained, dikes and sills up to 16 ft thick",null,null,"MG002",425,"McGrath",null,1011,"Thf"]
["Tim","Mafic sills and dikes","Paleocene and Eocene","Mafic (dark brown), pandiomorphic-granular, sills and dikes up to 34 ft thick.  Locally porphyritic basalt, gabbro, and diabase",null,"K/Ar mineral ages ranging from 45.5 to 55.0 Ma","MG002",430,"McGrath","Ign",1012,"Thm"]
["Tvld","Lapilli tuff","Eocene and Oligocene","Light gray to bleached white with yellowish staining, locally banded (purple, white), lapilli dacite and tuff of Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,null,"MG002",240,"McGrath","Ign",1081,"Tvb"]
["Tvd","Massive dacite","Oligocene","Light- to medium-gray, porphyro-aphanitic, hornblende-bearing massive dacite of Terra Cotta volcanic field of Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields",null,"Whole-rock Ar/Ar age of 31.3 from Terra Cotta volcanic field","MG002",235,"McGrath","Ign",1081,"Tvb"]
["Tvt","Intermediate to felsic air-fall tuff","Eocene","Composite unit of light- to medium-green-gray, well laminated medium to very coarse grained, crystal-rich, air-fall tuff of Ship Creek, Windy Fork, and Terra Cotta Volcanic Fields","Petrified wood, dicotyledon, and Metasequoia",null,"MG002",225,"McGrath","Ign",1081,"Tvb"]
["Tvab","Andesite breccia","Eocene","Medium-gray, purple-hued weathering, porphyritic, pyroxene andesite containing distinctive zones of pyroclastic breccia consisting of in situ andesite fragments.  Groundmass is aphanitic to interstitcial.  Ship Creek, Windy Fork, and Terra Cotta Volcanic",null,"Ar/Ar age of 41.1 Ma from hornblende of Terra Cotta volcanic field","MG002",250,"McGrath","Ign",1081,"Tvb"]
["Twg","Windy Fork granite","Oligocene","White to pink and locally blue-gray, medium- to coarse-grained, peralkaline arfvedsonite granite of Windy Fork pluton",null,"K/Ar ages of 23.4 Ma from pyroxene, 30.1 Ma from biotite, and 29.0 Ma from hornblende","MG002",445,"McGrath","Ign",1270,"Togr"]
["Tgd","Hartman pluton granodiorite","Eocene","Medium- to coarse-grained, equigranular, hornblende-biotite granodiorite with a strong hornfels aureole.  (Not equivalent in age to Hartman plutons of Lime Hilles quadrangle.)",null,"K/Ar age of 37.9 Ma from biotite","MG002",450,"McGrath","Ign",1300,"Tegr"]
["Tqm","Quartz monzonite, monzonite breccia, and quartz porphyry","Paleocene and Eocene","Composite unit of light gray, fine- to medium-grained hypidiomorphic to equigranular, biotite quartz monzonite, aegirine-rich monzonite, and altered biotite quartz porphyry",null,"Nine K/Ar ages range from 51.1 to 61.8 Ma","MG002",455,"McGrath","Ign",1307,"Tgdp"]
["Tgr","South Fork granite","Paleocene and Eocene","Light gray, pink, medium- to coarse-grained, equigranular, biotite (muscovite) granite",null,"K/Ar age of 58.8 Ma from biotite","MG002",460,"McGrath","Ign",1320,"Tpgr"]
["Tgqm","Middle Fork Plutonic Complex; granite, quartz monzonite, and monzodiorite","Paleocene and Eocene","Fine- to medium-grained, biotite- and hornblende-bearing plutonic rocks with variable quartz contents and feldspar ratios",null,"Three K/Ar mineral ages of 56.1, 56.6, and 57.2 Ma from quartz monzonite.  Two K/Ar ages of 57.7 and 55.6 Ma","MG002",470,"McGrath","Ign",1320,"Tpgr"]
["Tgsy","Middle Fork Plutonic Complex; granite to quartz syenite","Paleocene and Eocene","Fine- to medium-grained, granite to quartz syenite",null,null,"MG002",480,"McGrath","Ign",1320,"Tpgr"]
["Tsy","Middle Fork Plutonic Complex; syenite","Paleocene and Eocene","Green-gray, white-gray weathering, medium- to coarse-grained, olivine-clinopyroxene syenite.  Locally iron stained",null,null,"MG002",485,"McGrath","Ign",1320,"Tpgr"]
["TKqm","Mount Estelle granodiorite","Cretaceous and Paleocene","Fresh, medium-gray, medium-grained, equigranular, hornblende-biotite granodiorite.",null,"Ar/Ar age of 79.0 Ma from biotite","MG002",490,"McGrath","Ign",1350,"Thgd"]
["Tgb","Middle Fork Plutonic Complex; alkali gabbro","Paleocene and Eocene","Dark green-brown, fine- to medium-grained, biotite-olivine-pyroxene gabbro",null,null,"MG002",475,"McGrath","Ign",1380,"Tgl"]
["TKvt","Air-fall tuff of intermediate composition","Cretaceous and Paleocene","Light- to medium-green-gray, well-laminated, crystal tuff.  Veleska Lake Volcanic Field","'rich in undated plant fossils'",null,"MG002",295,"McGrath","Ign",1600,"TKv"]
["TKm","Gabbro-granodiorite","Cretaceous","Heterogeneous dike swarms consisting of augite gabbro, hornblende granodiorite, and monzodiorite",null,"K/Ar ages of 69.7 Ma from biotite and 79.0 Ma from hornblende","MG002",495,"McGrath","Ign",1601,"TKd"]
["TKvf","Rhyolite tuff","Cretaceous and Paleocene","White- to light-gray, locally banded, hypocrystalline rhyolite.  Veleska Lake Volcanic Field",null,null,"MG002",285,"McGrath","Ign",1603,"TKvr"]
["TKvd","Dacite flows and dikes","Cretaceous and Paleocene","Light- to medium-gray, aphanitic to porphyro-aphanitic, chloritized hornblende dacite flows.  Veleska Lake Volcanic Field",null,"K/Ar age of 65.8 Ma","MG002",280,"McGrath","Ign",1604,"TKvd"]
["TKvm","Basalt andesite","Cretaceous and Paleocene","Medium-gray-green, fine-grained, augite-rich basaltic andesite and minor andesite flow breccia.  Veleska Lake Volcanic Field",null,null,"MG002",290,"McGrath","Ign",1605,"TKvi"]
["KJsh","Flyschoid sandstone and shale","Jurassic and Cretaceous","Medium- to very dark-gray, fine-grained, lithic sandstone, siltstone, and shale.  Kahiltna Terrane","Inoceramus murgalensis and Inoceramus peltiformis pochialaynen (Early Cretaceous)",null,"MG002",300,"McGrath","Sed",2850,"KJf"]
["KJs","Coarse sandstone and minor siltstone","Jurassic and Cretaceous","Medium-gray to distinctly tan-weathered, lithic sandstone containing clasts of volcanic rocks, sandstone and shale, granitic rocks, quartz, and lime-rich sediments.  Flute clasts and ripple marks common.  Kahiltna Terrane","Early Cretaceous pelecypods",null,"MG002",305,"McGrath","Sed",2850,"KJf"]
["KJc","Pebble to boulder conglomerate and minor sandstone","Jurassic and Cretaceous","Light-gray, tan weathered, pebble to boulder conglomerate.  Kahiltna Terrane","Inoceramus murgalensis (Early Cretaceous)",null,"MG002",310,"McGrath","Sed",2850,"KJf"]
["KJg","Gabbro and diorite","Jurassic and Cretaceous","Buff-weathered, dark green-gray gabbro and diorite.  Unit may be equivalent to Jurassic-Cretaceous gabbro-diorite swarm that intrudes along a major suture separating the Pingston Terrane from the Yukon-Tanana terrane in Denali National Park",null,null,"MG002",505,"McGrath","Ign",2920,"Jmu"]
["KJm","Slate and metasiltstone","Jurassic and Cretaceous","Very thin-bedded, fissile, rusty-brown-weathered, black slate, metasiltstone, micaceous metasandstone, and rare silty limestone turbidite.  McKinley Terrane","Mesozoic radiolaria and megafossils from Talkeetna quad",null,"MG002",315,"McGrath","Meta",2852,"KJfn"]
["lJs","Tatina River Volcanics; phosphatic shale and green volcaniclastic sandstone","Jurassic","Medium- to very-dark-gray, distinctly bleached bluish-white, phosphatic shale; green, medium grained, concretion-rich, volcaniclastic sandstone; and minor tan chert-cobble pebble conglomerate.  Farewell Composite Terrane","Entolium sp. and Eopecten (?) sp. of Jurassic age",null,"MG002",335,"McGrath","Sed",3210,"JTrtv"]
["Trls","Limestone and shale","Triassic","Thin-bedded, medium gray quartzitic limestone; gray, silty limestone, and shale.  Basal beds mainly fine-grained, gray sandstone and siltstone and subordinate cherty limestone.  Pingston Terrane","Monotis sp. (Late Triassic) pelecypod",null,"MG002",320,"McGrath","Sed",4033,"Trcs"]
["Trs","Tatina River Volcanics; shale, coarse volcaniclastic sandstone, and chert","Triassic","Tan to greenish-gray, buff to orange weathered, pebble rich, immature conglomerate, coarse volcaniclastic sandstone, distinctly brown silty shale, and light gray, green, and black chert.  Farewell Composite Terrane","Monotis subcircularis and Halobia cf. fallax late-Early-to-early Late Norian of the Late Triassic",null,"MG002",345,"McGrath","Sed",4050,"Trcg"]
["Trab","Tatina River Volcanics; pillow basalt and gabbro","Triassic","Dark green-gray, massive, aphanitic to medium-grained, olivine-clinopyroxene rich, pillow basalt, olivine diabase and gabbro sills, and mafic agglomerate.  Locally well developed pillow structure.  Farewell Composite Terrane",null,null,"MG002",340,"McGrath","Ign",4215,"JTrtv"]
["Trum","Ultramafic to diorite sills","Late Triassic","Dark green-gray, fine- to coarse-grained, ultramafic sills, olivine gabbro, and diorite, 50 to 66 ft thick",null,null,"MG002",510,"McGrath","Ign",4320,"Trgb"]
["MzPzi","Gabbro and diorite sills and dikes","Early Paleozoic","Brownish weathered, dark green-gray, very fine- to medium-grained phaneritic, locally micropegmatoidal, olivine, aegirine-augite, gabbro, diorite, and uncommonly alkali syenite",null,null,"MG002",515,"McGrath","Ign",5180,"MzPzi"]
["uPzs","Volcanogenic phyllite","Permian","Dark gray-green to distinctly maroon, pyrite-rich volcanogenic phyllite cut by thin quartz-carbonate veins.  Yukon-Tanana Terrane",null,null,"MG002",325,"McGrath","Ign",5545,"PMpc"]
["uPzc","Phyllitic chert and siliceous phyllite","Mississippian to Permian","White-weathered, gray-green, banded phyllitic ribbon chert.  Yukon-Tanana Terrane","Pennsylvanian through Permian radiolaria; Mississippian through Permian Radiolaria and conodonts",null,"MG002",330,"McGrath","Sed",5545,"PMpc"]
["PDs","Sheep Creek Formation; sublithic sandstone, limestone-chert conglomerate, and minor limestone","Middle Devonian to Permian","Medium-gray, distinctly brown-red weathered, medium- to coarse-grained, sublithic sandstone and pebble conglomerate that contains clasts of limestone, chert, lithic fragments, volcanic clasts, and polycrystalline quartz.  Limestone-chert conglomerate nea","Fusilinids (Late Pennsylvanian to Permian), Palmatolepis sp. and Polygnathus sp. conodonts (Frasnian(Late Devonian)), Dendrostrella sp. cf. D. trigemme (Late Eifelian and Givetian (Middle Devonian)),",null,"MG002",350,"McGrath","Sed",6010,"PDsc"]
["mSl","Terra Cotta Mountains Sandstone; argillaceous graptolitic limestone","Silurian","Medium- to dark-gray and brown weathered limestone containing graptolite-bearing silty sandstone intervals.  Generally equivalent to Middle Limestone member of Churkin and Carter (1996).  Dillinger Subterrane","Pristiograptus dubious, Monograptus cf. M. ludensis, and Monograptus digitatus (Wenlockian stage of the Silurian) Also orthoconic nautiloid cephalopods, cardiolid bivalves, and ribbed atrypacean brachiopods of probably Silurian age",null,"MG002",390,"McGrath","Sed",6660,"Stc"]
["lSl","Post River Sandstone; boundary limestone","Early Silurian","Thin, dark gray, fetid, laminated limestone with thin silty sand layers, and thin interbeds of black cherty argillite.  Dillinger Subterrane","Cryptograptus centrifugus of C. centifugus zone, earliest Wenlockian stage, late Early Silurian",null,"MG002",400,"McGrath","Sed",7580,"SCpl"]
["uSsl","Terra Cotta Mountains Sandstone; thin-bedded calcareous sandstone, graptolitic shale, and silty limestone","Silurian","Thin-bedded, gray to tan, micaceous sandstone, silty limestone, and dark gray graptolitic shale.  Local flute clasts and ripple marks.  Probably equivalent of Upper Limestone member of Churkin and Carter (1996).  Dillinger subterrane","Monograptus cf. M. pseudodubius, Lobograptus progenitor, and Pristiograptus cf. P. tumescens from the Neodiversograptus nilssoni zone, Ludlovian stage (Late Silurian)",null,"MG002",380,"McGrath","Sed",6660,"Stc"]
["mSvs","Terra Cotta Mountains Sandstone; phyllite, volcaniclastic sandstone and chert","Silurian","Thin-bedded, complexly folded, maroon to green phyllite, medium-green, medium-grained volcaniclastic sandstone, and green-gray chert.  Dillinger Subterrane",null,null,"MG002",385,"McGrath","Sed",6660,"Stc"]
["mSs","Terra Cotta Mountains Sandstone; feldspathic-lithic sandstone, limey siltstone, and argillite","Silurian","Medium olive gray to terra cotta, medium-to coarse-grained, thin-bedded to massive, calcareous lithic sandstone, and siltstone containing local gray shale intervals and minor pebble conglomerate beds.  Sandstones have well developed oscillation ripple ma","Monograptus aff. M. Priodon and Cryptograptus lundgreni (middle to early Wenlockian stage of Silurian)",null,"MG002",395,"McGrath","Sed",6660,"Stc"]
["uDl","St. Johns Hill Formation; massive micritic limestone","Devonian","Medium-gray, massive- to thck-bedded, micritic limestone that contains crypto-algal laminations, thin, black chert partings, and dolomitic nodules.  Identical in age and character of unit described by Reed and Nelson (1980) near base of Mystic subterrane","Rugose corals, brachiopods, and pelecypods (Frasnian (early Late Devoian))",null,"MG002",365,"McGrath","Sed",6931,"DSml"]
["Dls","St. Johns Hill Formation; limestone and minor siltstone","Devonian","Brown to terra cotta, micaceous, slightly pyritic, thinly laminated mudstone, siltstone, limestone, and medium-grained lithic sandstone.  Tentatively correlative basal portion of PDs.  Farewell Composite Terrane",null,null,"MG002",370,"McGrath","Sed",6931,"DSml"]
["DSl","Barren Ridge Limestone; calcarenite, calcareous siltstone, and laminated limestone","Silurian and Devonian","Thin- to thick-bedded, buff to orange-weathered, light- to medium-gray, phyllitic calcarenite, thin-bedded orange to buff siltstone, and light-gray silty limestone.  Dillinger subterrane","Conodonts (Late Silurian to Late Devonian)",null,"MG002",375,"McGrath","Sed",6952,"DSca"]
["lDl","Sheep Creek Formation; massive algal limestone","Devonian","Massive, thick-bedded, medium-gray limestone, rich in algal laminations and Amiphipora sp.  Farewell Composite Terrane","Ozarkodina sp. indet. or Kockelella sp. indet. (Middle Silurian-to-early Devonian)",null,"MG002",355,"McGrath","Sed",6931,"DSml"]
["lDd","Sheep Creek Formation; dolomite","Devonian","Light gray, dolomitized, algal (?) limestone similar in appearance to lDl.  Thought to be correlative with lDl.  Farewell Composite Terrane",null,null,"MG002",360,"McGrath","Sed",6931,"DSml"]
["SOsh","Post River Sandstone; graptolitic shale, siltstone, and chert","Ordovician and Silurian","Medium- to dark-gray, fetid, fissile, isoclinally folded, carbonaceous shale, siltstone, and black bioturbated, silaceous siltstone and chert.  Local distinctive sulfurous plumes.  One of the most complete Ordivician-Lower Silurian graptolite successions","15 graptolite zones representing 5 of 6 Ordivician stages and most of the Landoverian stage of the Early Silurian",null,"MG002",405,"McGrath","Sed",7580,"SCpl"]
["OCls","Lyman Hills Formation; silty limestone and shale","Cambrian and Ordovician","Rhythmically layered, thin-bedded, orange to buff, light gray when fresh, limestone, silty shale, and light olive shale.  Lime units have parallel and cross laminations.  Shale and siltstone have ripple-laminated structures with amplitudes of 5 to 70 cm.","Adelograptus graptolite zone of the Early Ordovician, Teridontis nakamurai of the Cordylodus lindstromi zone of the Late Cambrian-to-Early Ordovician",null,"MG002",410,"McGrath","Sed",7580,"SCpl"]
["PzpCs","Metaquartzite and calcareous phyllite","Precambrian to Devonian","Light- to medium-gray, fine- to coarse-grained, metaquartzite, quartz-feldspar \"grit\", calcareous phyllite, and minor metachert.  Minchumina subterrane",null,null,"MG002",415,"McGrath","Meta",8300,"CZw"]
["Tids","Dike swarm and hornfels","Paleocene to Oligocene","Large linear zones of multiple dikes of variable composition and size that create extensive hornfels aureole and include fragments of layered country rocks",null,null,"MG002",435,"McGrath","Meta",1010,"Thf"]
["Qs","Surficial deposits","Holocene and Pleistocene","Surficial deposits, undifferentiated",null,null,"GU002",100,"Gulkana","Unconsol",100,"Qs"]
["Qa","Alluvial deposits","Holocene","Alluvial deposits",null,null,"GU002",106,"Gulkana","Unconsol",100,"Qs"]
["Qco","Colluvial deposits","Holocene","Colluvial deposits, river bluff type",null,null,"GU002",107,"Gulkana","Unconsol",100,"Qs"]
["Qc","Conglomerate","Pleistocene","Conglomerate, fluvial deposits derived from Wrangell Lava and deposited on unit QTu, undifferentiated volcanic rocks and older, pre-Wrangell rocks",null,null,"GU002",112,"Gulkana","Sed",100,"Qs"]
["Ql","Lacustrine deposits","Late Pleistocene","Lacustrine deposits",null,null,"GU002",109,"Gulkana","Unconsol",100,"Qs"]
["Qds","Active cliff-head dune deposits","Holocene","Active cliff-head dune deposits",null,null,"GU002",105,"Gulkana","Unconsol",100,"Qs"]
["Qnf","Volcanic rocks-Nathlie Mountain eruptive center","Pleistocene","Flows, breccias, and sedimentary rocks",null,null,"GU002",127,"Gulkana","Sed",300,"Qv"]
["Qcc","Volcanic rocks-Capital Volcano","Pleistocene","Caldera lavas",null,null,"GU002",130,"Gulkana","Ign",300,"Qv"]
["Qcs","Volcanic rocks-Capital Volcano","Pleistocene","Shield lavas",null,null,"GU002",131,"Gulkana","Ign",300,"Qv"]
["Qdf","Volcanic rocks-Drum Volcano","Pleistocene","Cone building flows",null,null,"GU002",118,"Gulkana","Ign",301,"Qw"]
["Qsf","Volcanic rocks-Sanford Volcano","Pleistocene","Basalt, andesite, and dacite lava, undifferentiated",null,null,"GU002",123,"Gulkana","Ign",301,"Qw"]
["Qsdf","Sanford Debris flow deposits","Quaternary","Debris derived from collapse of a dome on Sanford Volcano.  Flow traveled a great distance down the Sanford Glacier/River valley to confluence with the Copper River",null,null,"GU002",180,"Gulkana","Unconsol",312,"Qdf"]
["Qda","Volcanic rocks-Drum Volcano","Pleistocene","Volcanic avalanche deposits",null,null,"GU002",117,"Gulkana","Unconsol",314,"Qva"]
["Qms","Mineral spring and mud volcano deposits","Holocene and Pleistocene","Mineral Spring and mud volcano deposits",null,null,"GU002",108,"Gulkana","Unconsol",315,"Qmsv"]
["Qsh","Volcanic rocks-Sanford Volcano","Pleistocene","Hyaloclastite",null,null,"GU002",122,"Gulkana","Ign",316,"Qat"]
["Qbc","Cinder cones and associated flows","Pleistocene","Cinder cones and associated flows",null,null,"GU002",111,"Gulkana","Ign",320,"Qcs"]
["Qdc","Volcanic rocks-Drum Volcano","Pleistocene","Collapsed dome",null,null,"GU002",121,"Gulkana","Ign",400,"Qi"]
["Qsi","Volcanic rocks-Sanford Volcano","Pleistocene","Shallow plutons",null,null,"GU002",124,"Gulkana","Ign",400,"Qi"]
["Qdd","Volcanic rocks-Drum Volcano","Pleistocene","Dacite domes",null,null,"GU002",119,"Gulkana","Ign",401,"Qvd"]
["Qdr","Volcanic rocks-Drum Volcano","Pleistocene","Rhyolite domes",null,null,"GU002",120,"Gulkana","Ign",401,"Qvd"]
["Qsr","Volcanic rocks-Sanford Volcano","Pleistocene","Rhyodacite dome and flow",null,null,"GU002",125,"Gulkana","Ign",401,"Qvd"]
["Qni","Volcanic rocks-Nathlie Mountain eruptive center","Pleistocene","Dacite pluton",null,null,"GU002",126,"Gulkana","Ign",401,"Qvd"]
["Qcr","Volcanic rocks-Capital Volcano","Pleistocene","Rhyolite dikes and laccoliths",null,null,"GU002",128,"Gulkana","Ign",401,"Qvd"]
["Qcd","Volcanic rocks-Capital Volcano","Pleistocene","Radial dike swarm and plugs",null,null,"GU002",129,"Gulkana","Ign",403,"Qds"]
["QTu","Volcanic rocks","Pleistocene and Pliocene (?)","Volcanic rocks, undifferentiated",null,null,"GU002",110,"Gulkana","Ign",450,"QTv"]
["Qwf","Volcanic rocks-Wrangell Volcano","Holocene (?) and Pleistocene","Andesite flows and fragmental rocks",null,null,"GU002",115,"Gulkana","Ign",455,"QTw"]
["QTi","Intrusive rocks","Pleistocene and Pliocene (?)","Intrusive rocks",null,null,"GU002",113,"Gulkana","Ign",460,"QTi"]
["Qwd","Volcanic rocks-Wrangell Volcano","Holocene (?) and Pleistocene","Dacite flows",null,null,"GU002",116,"Gulkana","Ign",465,"QTva"]
["Ts","Sedimentary rocks","Cenezoic","Sedimentary rocks",null,null,"GU002",135,"Gulkana","Sed",500,"Tsu"]
["Czab","Olivine basalt and andesite","Cenozoic","Olivine basalt and andesite",null,null,"GU002",114,"Gulkana","Ign",1000,"Tvu"]
["Ta","Andesite flows; Metamorphic Complex of Gulkana River","Tertiary (?)","Andesite flows",null,null,"GU002",158,"Gulkana","Ign",1000,"Tvu"]
["Km","Matanuska Formation","Cretaceous","Matanuska Formation",null,null,"GU002",176,"Gulkana","Sed",2010,"Km"]
["Kg","Granodiorite pluton","Cretaceous (?)","Granodiorite pluton, Wrangellia Terrane",null,null,"GU002",137,"Gulkana","Ign",2420,"Kgd"]
["Kgd","Wrangellia Terrane","Cretaceous (?)","Granodiorite pluton",null,null,"GU002",136,"Gulkana","Ign",2900,"KJg"]
["hbqd","Hornblende-biotite quartz diorite; Peninsular Terrane","Jurassic or Cretaceous","Hornblende-biotite quartz diorite",null,null,"GU002",173,"Gulkana","Ign",2900,"KJg"]
["hbqm","Hornblende-biotite quartz monzonite; Peninsular Terrane","Jurassic or Cretaceous","Hornblende-biotite quartz monzonite",null,null,"GU002",174,"Gulkana","Ign",2900,"KJg"]
["hbgd","Hornblende-biotite granodiorite; Peninsular Terrane","Jurassic or Cretaceous","Hornblende-biotite granodiorite",null,null,"GU002",175,"Gulkana","Ign",2900,"KJg"]
["Jtrd","Rhyodacite flows; Talkeetna Formation","Early Jurassic","Rhyodacite flows with minor sandstones and lesser dacite flows",null,null,"GU002",177,"Gulkana","Sed",3250,"JTrtk"]
["Jta","Hornblende andesite flows; Talkeetna Formation","Early Jurassic","Hornblende andesite flows",null,null,"GU002",178,"Gulkana","Ign",3250,"JTrtk"]
["Jts","Talkeetna Formation, sandstone","Early Jurassic","Sandstone with sparse volcaniclastics",null,null,"GU002",179,"Gulkana","Sed",3250,"JTrtk"]
["shgb","Schistose hornblende gabbro; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose hornblende gabbro",null,null,"GU002",164,"Gulkana","Meta",3540,"Jmu"]
["scgb","Schistose clinopyroxene gabbro; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose clinopyroxene gabbro",null,null,"GU002",165,"Gulkana","Meta",3545,"Jmu"]
["sqm","Schistose quartz monzonite; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose quartz monzonite",null,null,"GU002",160,"Gulkana","Meta",5245,"JPaur"]
["sqd","Schistose quartz diorite; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose quartz diorite",null,null,"GU002",161,"Gulkana","Meta",5245,"JPaur"]
["sgd","Schistose granodiorite; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose granodiorite",null,null,"GU002",162,"Gulkana","Meta",5245,"JPaur"]
["shd","Schistose hornblende diorite; Metamorphic Complex of Gulkana River","Late Jurassic or older","Schistose hornblende diorite",null,null,"GU002",163,"Gulkana","Meta",5245,"JPaur"]
["ag","Amphibolite gneiss; Metamorphic Complex of Gulkana River","Late Jurassic or older","Amphibolite gneiss",null,null,"GU002",166,"Gulkana","Meta",5245,"JPaur"]
["Trg","Wrangellia Terrane","Late Triassic (?)","Clinopyroxene-hornblende gabbro, and diabase and gabbronorite dikes",null,null,"GU002",138,"Gulkana","Ign",4320,"Trgb"]
["Trcg","Wrangellia Terrane","Late Triassic (?)","Clinopyroxene-hornblende stocks and plugs",null,null,"GU002",139,"Gulkana","Ign",4320,"Trgb"]
["Trn","Nikolai Greenstone","Late Triassic","Nikolai Greenstone",null,null,"GU002",155,"Gulkana","Sed",4420,"Trn"]
["qmfs","Quartz-muscovite-feldspar schist; Metamorphic Complex of Gulkana River","Late Paleozoic (?) or older","Quartz-muscovite-feldspar schist",null,null,"GU002",168,"Gulkana","Meta",5203,"PPast"]
["mmp","Metamorphosed pelitic and calc-schist; Metamorphic Complex of Gulkana River","Late Paleozoic (?) or older","Metamorphosed pelitic and calc-schist",null,null,"GU002",169,"Gulkana","Meta",5209,"PPast"]
["ds","Dadina schist","Late Paleozoic (?) or older","Coarse quartz-biotite schist, altered and cataclastic meta-andesite, over lain(?) by amphibolite schist, mica-schist, and minor meta-limestone.  Intruded by unmetamorphosed coarse-grained quartz diorite dikes.  Also includes sheared meta-gabbro.  Dadina",null,null,"GU002",172,"Gulkana","Meta",5204,"PPast"]
["mha","Metamorphosed hornblende andesite; Metamorphic Complex of Gulkana River","Late Paleozoic (?) or older","Metamorphosed hornblende andesite",null,null,"GU002",167,"Gulkana","Meta",5550,"PPast"]
["PPs","Slana Spur Formation","Middle and Late Pennsylvanian and Early Permian","Slana Spur Formation",null,null,"GU002",156,"Gulkana","Sed",5630,"PPasc"]
["mcb","Metamorphosed clinopyroxene basalt; Metamorphic Complex of Gulkana River","Late Paleozoic (?) or older","Metamorphosed clinopyroxene basalt",null,null,"GU002",170,"Gulkana","Meta",5641,"PPast"]
["am","Amphibolite; Metamorphic Complex of Gulkana River","Late Paleozoic (?) or older","Amphibolite",null,null,"GU002",171,"Gulkana","Meta",5680,"PPast"]
["PPf","Ahtell Pluton","Permian and Pennsylvanian","Fine-grained biotite granite",null,null,"GU002",145,"Gulkana","Ign",5870,"Pmgi"]
["PPp","Ahtell Pluton","Permian and Pennsylvanian","Porphyritic hornblende granodiorite",null,null,"GU002",146,"Gulkana","Ign",5870,"Pmgi"]
["PPg","Ahtell Pluton","Permian and Pennsylvanian","Biotite-hornblende granite and granodiorite",null,null,"GU002",147,"Gulkana","Ign",5870,"Pmgi"]
["PPa","Diorite Complex","Permian and Pennsylvanian","Altered diabase and gabbronorite",null,null,"GU002",148,"Gulkana","Ign",5880,"PPad"]
["PPd","Diorite Complex","Permian and Pennsylvanian","Diorite, granodiorite, and gabbronorite",null,null,"GU002",149,"Gulkana","Ign",5880,"PPad"]
["Pt","Tetelna Volcanics","Pennsylvanian","Tetelna Volcanics",null,null,"GU002",157,"Gulkana","Ign",6220,"Pat"]
["TKhf","Hornfels","Tertiary and Cretaceous","Hornfels created from plutonic rocks described above : Km, Kmd, TKgr, TKgp, Tgd, Tqm, Tgr",null,null,"MG003",647,"McGrath","Meta",1970,"Kk"]
["Q","Quaternary surficial deposits, undivided","Quaternary","Surficial deposits",null,null,"MG003",100,"McGrath","Unconsol",100,"Qs"]
["Tcg","Nonmarine sedimentary rocks","Eocene to Oligocene","Coal-bearing sandstone, shale and conglomerate","Fossil data summarized in Bundtzen",null,"MG003",605,"McGrath","Sed",640,"Tcb"]
["Tclg","Nonmarine sedimentary rocks","Eocene to Oligocene","Limestone-rich conglomerate",null,null,"MG003",606,"McGrath","Sed",500,"Tsu"]
["Tgr","Granite","Tertiary","Granite of Cheeneetnuk River area",null,"38 Ma","MG003",646,"McGrath","Ign",1300,"Tegr"]
["Tqm","Quartz Monzonite","Tertiary","Quartz monzonite of Selatna Hills area",null,"60 Ma","MG003",645,"McGrath","Ign",1307,"Tgdp"]
["Tgd","Granodiorite","Tertiary","Granodiorite of the Selatna and Tatlawiksuk Hills area",null,"61 and 62 Ma","MG003",644,"McGrath","Ign",1350,"Thgd"]
["TKgr","Granite of Lone Mt. Complex","Tertiary and Cretaceous","Granite of Lone Mt. Complex",null,"58.5 Ma and 65 Ma","MG003",642,"McGrath","Ign",1655,"TKg"]
["TKgp","Granite Porphyry","Late Cretaceous and Early Tertiary","Granite Porphyry",null,null,"MG003",643,"McGrath","Ign",1655,"TKg"]
["Kcs","Kuskokwim Group; Deep Water (Turbidite-Fan) Facies","Late Cretaceous","Coarse lithic sandstone and pebble conglomerate",null,null,"MG003",609,"McGrath","Sed",1970,"Kk"]
["Kss","Kuskokwim Group; Deep Water (Turbidite-Fan) Facies","Late Cretaceous","Fine, medium, and coarse-grained lithic conglomerate",null,null,"MG003",610,"McGrath","Sed",1970,"Kk"]
["Kls","Kuskokwim Group; Deep Water (Turbidite-Fan) Facies","Late Cretaceous","Calcareous medium to coarse-grained lithic sandstone and siltstone",null,null,"MG003",611,"McGrath","Sed",1970,"Kk"]
["Kus","Kuskokwim Group; Lithologies of Unknown Facies Assignment","Late Cretaceous","Kuskokwim Group clastic rocks- undifferentiated",null,null,"MG003",612,"McGrath","Sed",1970,"Kk"]
["Ksh","Kuskokwim Group; Lithologies of Unknown Facies Assignment","Late Cretaceous","Shale and siltstone and very minor fine-grained sandstone",null,null,"MG003",613,"McGrath","Sed",1970,"Kk"]
["Kqs","Kuskokwim Group; Shallow Marine to Locally Nonmarine Shoreline Facies","Late Cretaceous","Quartzose sublithic sandstone, siliceous shale, and siltstone; minor coal","Leaf hash and nonmarine to brackish water pelecypod fauna",null,"MG003",607,"McGrath","Sed",1985,"Kkn"]
["Kqcs","Kuskokwim Group; Shallow Marine to Locally Nonmarine Shoreline Facies","Late Cretaceous","Coarse grained sandstone and pebble-to-cobble conglomerate.  Quartz-rich sublithic to bleached white coarse facies of Kqs",null,null,"MG003",608,"McGrath","Sed",1985,"Kkn"]
["Kvm","Basaltic Andesite of Takotna and Candle Hills Volcanic-Plutonic Complex","Cretaceous","Basaltic Andesite of Takotna and Candle Hills volcanic-Plutonic Complex",null,"74 Ma","MG003",648,"McGrath","Ign",2270,"Kvl"]
["Kvmp","Porphyritic Basaltic Andesite of Candle Hills and Takotna Volcanic-Plutonic Complex","Cretaceous","Porphyritic Basaltic Andesite of Candle Hills and Takotna Volcanic-Plutonic Complex",null,"73 Ma","MG003",649,"McGrath","Ign",2270,"Kvl"]
["Km","Olivine Monzonite of the Candle Hills Pluton","Cretaceous","Olivine monzonite of the Candle Hills Pluton",null,"70 Ma","MG003",640,"McGrath","Ign",2470,"Kg"]
["Kmd","Monzonite and Monzodiorite of Takotna Pluton","Cretaceous","Monzonite and monzodiorite of Takotna Pluton",null,"72 Ma","MG003",641,"McGrath","Ign",2470,"Kg"]
["Trb","Tholeiitic pillow basalt","Late Triassic","Tholeiitic pillow basalt; Equivalent to Tatina River Volcanics of Buntzen and others, 1997 (Farewell Composite terrane, Mystic sub-terrane",null,null,"MG003",614,"McGrath","Ign",4215,"JTrtv"]
["MzPzi","Olivine Gabbro sills","Triassic to Tertiary","Olivine Gabbro sills",null,null,"MG003",650,"McGrath","Ign",5180,"MzPzi"]
["uPzac","Argillite and chert, equivalent to Sheep Creek Formation","Late Devonian to Permian","Argillite and chert; Equivalent to Sheep Creek Formation as defined by Buntzen and others, 1997 (Farewell Composite Terrane; Mystic Subterrane)","Pennsylvanian fossils",null,"MG003",616,"McGrath","Sed",6010,"PDsc"]
["uPzs","Sandstone and detrital limestone","Late Paleozoic","Sandstone and detrital limestone (Farewell Composite Terrane; Mystic Subterrane)","Contains Upper Paleozoic fossils",null,"MG003",615,"McGrath","Sed",6010,"PDsc"]
["PDs","Sheep Creek Formation, brown siltstone","Late Devonian to Permian","Brown siltstone of Sheep Creek Formation (Farewell Composite Terrane; Mystic Subterrane)","Pennsylvanian fusilinids",null,"MG003",617,"McGrath","Sed",6010,"PDsc"]
["SOsh","Post River Formation, Graptolitic shale and chert","Silurian and Ordovician","Graptolitic shale and chert; Post River Formation of Churkin and Carter, 1996 and Buntzen and others, 1997 (Farewell Composite Terrane; Dillinger Subterrane)",null,null,"MG003",638,"McGrath","Sed",7580,"SCpl"]
["Ssh","Shale and siltstone","Mid-Silurian","Shale and siltstone; equivalent to Paradise Fork Formation of Dutro and Patton, 1982 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",624,"McGrath","Sed",6620,"Spf"]
["mSs","Terra Cotta Mountains sandstone; feldspathic-lithic sandstone","Middle Silurian","Feldspathic-lithic sandstone;  Terra Cotta sandstone of Churkin and Carter, 1996 and Buntzen and others, 1997 (Farewell Composite Terrane; Dillinger Subterrane)",null,null,"MG003",637,"McGrath","Sed",6660,"Stc"]
["uDl","Thick bedded dark gray limestone","Late Devonian (Frasnian)","Thick bedded dark gray limestone (Farewell Composite Terrane; Mystic Subterrane)",null,null,"MG003",618,"McGrath","Sed",6931,"DSml"]
["mDl","Cheeneetnuk limestone","Middle Devonian (Late Emsian to Givitian)","Cheeneetnuk limestone (Farewell Composite Terrane; Mystic Subterrane)",null,null,"MG003",619,"McGrath","Sed",6931,"DSml"]
["SDlw","Whirlwind Creek Formation (limestone and dolomite)","Middle Devonian (Late Emsian to Givitian (?))","Shallow water limestone and dolomite of Whirlwind Creek Formation as defined by Dutro and Patton, 1982 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",620,"McGrath","Sed",6960,"DSwc"]
["DSl","Barren Ridge limestone; calcarenite, calcareous siltstone, and laminated limestone","Silurian and Devonian","Calcarenite, calcareous siltstone, and laminated limestone;  Barren Ridge limestone of Churkin and Carter, 1996 and Buntzen and others, 1997 (Farewell Composite Terrane; Dillinger Subterrane)",null,null,"MG003",636,"McGrath","Sed",6952,"DSca"]
["lDd","Dolomite","Early Devonian","Thick bedded, cream-colored dolomite (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",621,"McGrath","Sed",6960,"DSwc"]
["lDl","Gray limestone interbedded with dolomite","Early Devonian","Gray limestone interbedded with lDd (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",622,"McGrath","Sed",6960,"DSwc"]
["Sla","Algal limestone","Mid-Silurian","Algal limestone (boundstone) thick-bedded algal-rich stromatoporid-rich limestone (Farewell Composite Terrane; Nixon Fork Subterrane)","Stromatoporid",null,"MG003",623,"McGrath","Sed",6960,"DSwc"]
["uOll","Laminated limestone","Late Ordovician","Laminated limestone; Probably equivalent to upper part of Telsitna Formation of Dutro and Patton, 1982 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",625,"McGrath","Sed",7520,"Ont"]
["uOl","Limestone, limestone breccia, and argillite","Late Ordovician","Limestone, limestone breccia, and argillite; Interbedded with uOll (Farewell Composite Terrane; Nixon Fork Subterrane)","Upper Ordivician fossils",null,"MG003",626,"McGrath","Sed",7520,"Ont"]
["mOl","Thick grainstone and micritic limestone","Middle Ordovician","Thick grainstone and micritic limestone (Farewell Composite Terrane; Nixon Fork Subterrane)","Middle Ordivician fauna",null,"MG003",627,"McGrath","Sed",7520,"Ont"]
["Ol","Limestone and argillite","Middle(?) and early Ordovician","Limestone and argillite; Thought to be equivalent to Novi Mt. Formation of Dutro and Patton, 1982 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",628,"McGrath","Sed",7520,"Ont"]
["OCls","Silty limestone and shale","Cambrian and Earliest Ordovician","Silty limestone and shale; essentially equivalent to Lyman Hills Formation in Dillinger Subterrane (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",630,"McGrath","Sed",7580,"SCpl"]
["OCls","Lyman Hills Formation, Silty limestone and shale","Ordovician and Cambrian","Silty limestone and shale; Lyman Hills Formation of Churkin and Carter, 1996 and Buntzen and others, 1997 (Farewell Composite Terrane; Dillinger Subterrane)",null,null,"MG003",639,"McGrath","Sed",7580,"SCpl"]
["lOlb","Limestone breccia and micrite","Early Ordovician","Limestone breccia and micrite; Equivalent to Novi Mt. Formation of Dutro and Patton, 1982 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",629,"McGrath","Sed",7520,"Ont"]
["OCm","Banded mudstone","Cambrian and Earliest Ordovician","Banded mudstone; Believed by Grant Abbott, 1989, to be similar to a Middle Cambrian unit exposed near Hess River in Yukon (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",631,"McGrath","Sed",7520,"Ont"]
["Clm","Limey, striped mudstone and siltstone","Middle (?) Cambrian","Limey, striped mudstone and siltstone; Probably equivalent to OCm (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",634,"McGrath","Sed",7580,"SCpl"]
["XCl","Oolitic limestone","Proterozoic to Early Cambrian","Oolitic limestone; same unit as Khuchaynik Dolomite of Babcock and others, 1994 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",632,"McGrath","Sed",8350,"CZds"]
["XCd","Oolitic, peletoidal dolomite","Proterozoic to Early Cambrian","Oolitic, peletoidal dolomite; Probably Big River dolostone of Babcock and others, 1994 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",633,"McGrath","Sed",8350,"CZds"]
["Xmso","Red ferriginous shale and orthoquartzite","Late Proterozoic","Red ferriginous shale and orthoquartzite;  Correlative with Windy Fork Formation of Babcock and others, 1994.  Also been called the Redstone Unit by Buntzen in 1984 (Farewell Composite Terrane; Nixon Fork Subterrane)",null,null,"MG003",635,"McGrath","Sed",8350,"CZds"]
["Kgm","Volcanic graywacke and mudstone","late Early Cretaceous (Albian)","Dark-greenish-gray, fine-grained to gritty(?), poorly sorted graywacke composed largely of first- and second-cycle volcanic debris but locally containing abundant granitic and metamorphic rock debris. Graded bedding common,  Dark gray mudstone interbeds.",null,null,"RB004",2105,"Ruby","Sed",2105,"Kvgm"]
["Ks","Sandstone, Quartz Conglomerate, shale, and siltstone","Probably Late Cretaceous","Non-marine deposits of olive-green, fine- to coarse-grained, crossbedded, quartzose sandstone and grit; quartz-pebble conglomerate, and dark micaeous shale and siltstone.  Ironstone lenses and concretions.  Better sorted and higher % quartz than Kgm.  Pr","Abundant carbonized plant debris",null,"RB004",1941,"Ruby","Sed",1941,"Kss"]
["Kc","Igneous pebble-cobble conglomerate","late Early Cretaceous (Albian) may be as young as Late Cretaceous","Massive poorly sorted conglomerate with pebble to cobble sized clasts primarily of mafic intrusive and extrusive rocks and varied colored chert.  Interbedded with fine-grained to gritty (?) , dark-green to green graywacke and mudstone.  grades upward int","Indeterminate pelecypods",null,"RB004",2030,"Ruby","Sed",2030,"Kcg"]
["Kv","Andesitic volcanic rocks","earliest Cretaceous (Neocomian) but may include Albian age strata","Koyukuk River- Pillow basalt and andesitic flows; andesitic tuffs, volcanic conglomerate, and breccia; chert and fine-grained cherty tuff; coquinoidal limestone composed largely of Buchia sp. Widely altered to a hard dark green hornfels.  Dulbi-Melozitna","Buchia sublaevis, belemnite; Buchia cf.B. crassicollis; Buchia keyserlingi",null,"RB004",2330,"Ruby","Ign",2330,"Kve"]
["Kg","Granitic rocks","Late Cretaceous?","Granodiorite",null,"K-Ar date of 81.5 to 89.0 Ma from similar plutons in Melozitna quad., however later data suggests Latest Cretaceous or Early Tertiary age from Nulato quadrangle.","RB004",2410,"Ruby","Ign",1655,"TKg"]
["JPb","Basalt and diabase","Permian to Jurassic.","Spilitic basalt and diabase largely altered to greenstone.  Along contact with Km, altered to mafic hornfels.   Probabaly correlative with similar rocks on strike to the NE in the Tanana and Bettles quads",null,null,"RB004",5140,"Ruby","Ign",5140,"JMab"]
["JPu","Ultramafics","Permian to Jurassic","Small bodies of serpentinized peridotite and dunite with closely associated gabbro and anorthosite.",null,null,"RB004",5150,"Ruby","Ign",5150,"Jaum"]
["PzpCg","Gneissic rocks","Paleozoic or Precambrian","Garnetiferous quartz-feldspar-biotite gneiss of almandine-amphibolite facies.  Also includes some quartzitic gneiss, amphibolitic gneiss, migmatite, small bodies of marble, and a few small bodies of granitic rock.",null,null,"RB004",8630,"Ruby","Meta",8801,"PzZrpg"]
["PzpCm","Metamorphic rocks (Pelitic schist)","Paleozoic or Precambrian","Pelitic schist, quartzite, and calcareous to dolomitic marble, generally of greenschist facies.",null,null,"RB004",8600,"Ruby","Meta",9325,"PzZrqs"]
["Qu","Unconsolidated deposits","Quaternary","Silt, sand, and gravel of stream beds, flood plains, and terraces",null,null,"RB004",100,"Ruby","Unconsol",100,"Qs"]
["GG","Gabbroic phaciods in McHugh Complex","Jurassic and Late Triassic(?)","Strongly altered gabbroic phacoids that are tectonic inclusions in the McHugh Complex",null,null,"VA004",4890,"Valdez","Meta",4890,"Mzum"]
["Kqs","Kuskokwim Group: Quartzose sublithic sandstone","Late Cretaceous","Shallow marine to fluvial facies quartzose sublithic sandstone, siliceous shale, and siltstone;  part of Kuskokwim Group","Leaf hash, and brackish water pelecypods and minor coal",null,"LH004",1986,"Lime Hills","Sed",1985,"Kkn"]
["Kqcs","Kuskokwim Group: Sandstone and conglomerate","Late Cretaceous","Shallow marine to fluvial facies coarse-grained sandstone and pebble-to-cobble conglomerate; minor very coarse-grained fluvial conglomerate and sandstone;  part of Kuskokwim Group",null,null,"LH004",1985,"Lime Hills","Sed",1985,"Kkn"]
["Kqvs","Kuskokwim Group: Sandstone","Late Cretaceous","Shallow marine to fluvial facies coarse-grained sandstone-conglomerate rich in volcanic clasts;  part of Kuskokwim Group",null,null,"LH004",1987,"Lime Hills","Sed",1985,"Kkn"]
["Kss","Kuskokwim Group: Sandstone and siltstone","Late Cretaceous","Deep water turbidite facies fine, medium, and coarse-grained sandstone and siltstone;  part of Kuskokwim Group",null,null,"LH004",1970,"Lime Hills","Sed",1970,"Kk"]
["Kcs","Kuskokwim Group: Turbidite facies","Late Cretaceous","Deep water, very coarse-grained, turbidite facies (proximal fan); part of Kuskokwim Group",null,null,"LH004",1971,"Lime Hills","Sed",1970,"Kk"]
["KJs","Kahiltna Assemblage: Turbidite sandstone and siltstone","Late Jurassic to Early Cretaceous","Fine-to-coarse grained turbidite sandstone and siltstone with minor fossil-rich, prismite-rich, limestone","Inoceramus",null,"LH004",2850,"Lime Hills","Sed",2850,"KJf"]
["Trb","Tholeiitic pillow basalt","Late Triassic age","Tholeiitic pillow basalt; part of Farewell Composite terrane and Mystic subterrane and equivalent to Tatina River Volcanics of Bundtzen and others, 1997",null,null,"LH004",4215,"Lime Hills","Ign",4215,"JTrtv"]
["Trvs","Volcanogenic sandstone and tuff","Late Triassic","Volcanogenic sandstone and tuff; part of Farewell Composite terrane and Mystic subterrane","Late Triassic fossils",null,"LH004",4050,"Lime Hills","Sed",4050,"Trcg"]
["uMl","Fossiliferous limestone","Late Mississippian","Fossiliferous limestone with minor siltstone; part of Farewell Composite terrane and Mystic subterrane","Fossiliferous limestone",null,"LH004",6335,"Lime Hills","Sed",6335,"PMl"]
["uDl","Thick bedded limestone","Late Devonian (Frasnian)","Thick bedded, gray, fossiliferous, limestone; part of Farewell Composite terrane and Mystic subterrane","Fossiliferous (Frasnian)",null,"LH004",6931,"Lime Hills","Sed",6931,"DSml"]
["Dsc","Shale and chert","Devonian (Gevitian to Frasnian)","Shale and chert; contains SEDEX barite deposits; part of Farewell Composite terrane and Mystic subterrane",null,null,"LH004",6911,"Lime Hills","Sed",6911,"Dsc"]
["lDl","Thick bedded limestone","Early Devonian (Emsian)","Thick bedded, dark-gray, limestone; part of Farewell Composite terrane and Mystic subterrane",null,null,"LH004",6932,"Lime Hills","Sed",6931,"DSml"]
["PDs","Siltstone and sandstone","Devonian to Pennsylvanian","Brown siltstone and sandstone of Sheep Creek Formation after Bundtzen and others (1997) ; part of Farewell Composite terrane and Mystic subterrane","Pennsylvanian fusilinids and brachiopods",null,"LH004",6010,"Lime Hills","Sed",6010,"PDsc"]
["Pzmu","Mystic Subterrane, undivided","Devonian to Triassic","Mystic subterrane, part of Farewell Composite terrane",null,null,"LH004",5375,"Lime Hills","Sed",5375,"JDm"]
["SDlw(h)","Massive micritic limestone","Late Silurian to Early Devonian","Massive micritic limestone karst rich and dolomitic; may be roughly equivalent to lower Whirlwind Creek Formation in Medfra and McGrath quadrangles; part of Farewell Composite terrane and Nixon Fork subterrane",null,null,"LH004",6960,"Lime Hills","Sed",6960,"DSwc"]
["Pzh","Holitna-Nixon Fork carbonates, undivided","Paleozoic","Holitna-Nixon Fork carbonates, undivided; part of Farewell Composite terrane and Nixon Fork subterrane",null,null,"LH004",8340,"Lime Hills","Sed",8340,"DZn"]
["DSl","Barren Ridge Limestone","Silurian to Devonian","Barren Ridge Limestone after Churkin and Carter (1996) and Bundtzen and others (1997);  part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",6952,"Lime Hills","Sed",6952,"DSca"]
["mSs","Terra Cotta Sandstone","Middle Silurian","Terra Cotta Sandstone after Churkin and Carter (1996) and Bundtzen and others (1997);  part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",6660,"Lime Hills","Sed",6660,"Stc"]
["SOsh","Post River Formation","Ordovician to Silurian","Post River Formation after Churkin and Carter (1996) and Bundtzen and others (1997); part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",7580,"Lime Hills","Sed",7580,"SCpl"]
["OCls","Lyman Hills Formation","Cambrian to Ordovician","Lyman Hills Formation after Bundtzen and others (1997); a separate mappable, lime rich zone (class 7582) is shown separately; part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",7581,"Lime Hills","Sed",7580,"SCpl"]
["MzPzi","Gabbro-diorite sills, dikes, and volcanics","Paleozoic and Mesozoic","Gabbro-diorite sills, dike swarms, and mafic volcanics;  part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",5180,"Lime Hills","Ign",5180,"MzPzi"]
["Pzdu","Dillinger subterrane, undivided","Paleozoic","Dillinger subterrane, undivided; part of Farewell Composite terrane",null,null,"LH004",5310,"Lime Hills","Sed",5310,"DCd"]
["Tgr","Granite","Tertiary","Coarse-grained granite",null,"K/Ar of 55 Ma","LH004",1320,"Lime Hills","Ign",1320,"Tpgr"]
["Tqm","Quartz monzonite dikes and plutons","Tertiary","Quartz monzonite dikes and small plutons",null,"K/Ar of 55 Ma","LH004",1307,"Lime Hills","Ign",1307,"Tgdp"]
["Tb","Basalt flows","Tertiary","Basalt flows",null,"K/Ar of 58 Ma","LH004",1004,"Lime Hills","Ign",1004,"Tb"]
["TKf","Felsite pluton","Cretaceous and Tertiary","Felsite pluton, age unknown",null,null,"LH004",1655,"Lime Hills","Ign",1655,"TKg"]
["TKqm","Quartz monzonite and diorite pluton","Tertiary and Cretaceous","Quartz monzonite to diorite pluton with gold-copper skarn",null,"K/Ar of 64 Ma","LH004",1656,"Lime Hills","Ign",1655,"TKg"]
["Dsl","Schwatka unit--Limestone","Middle and Early Devonian","Limestone",null,null,"CI003",703,"Circle","Sed",6945,"Ds"]
["TKk","Kichatna pluton","Late Cretaceous or Tertiary","Probably granite to tonalite",null,null,"TL002",280,"Talkeetna","Ign",1660,"TKm"]
["Q","Surficial deposits","Quaternary","Alluvium, colluvium, and loess",null,null,"RB004",100,"Ruby","Unconsol",100,"Qs"]
["TKg","Granite","Cretaceous-Tertiary","Medium- to coarse-grained equigranular to porphyritic biotite granite composed of anhedral quartz, anhedral to euhedral (porphyritic variety) K-feldspar, anhedral plagioclase and subhedral biotite",null,"K-Ar age of 65.5 +/- 3.3 m.y. from biotite","RB004",110,"Ruby","Ign",1655,"TKg"]
["Pzmi","Intermediate to mafic intrusive rocks","Paleozoic","Fine- to medium-grained gabbro, subordinate quartz diorite, quartz monzonite, orthopyroxene gabbro, and pyroxenite.  Commonly sill-like.  Wallrocks are restricted to the Rampart Group",null,null,"RB004",114,"Ruby","Ign",5113,"JPztm"]
["Pzrgs","Rampart Group","Paleozoic","Argillaceous and arenaceous rocks, siliceous and calcareous chemical sedimentary rocks and volcanic rocks.  Pzrgs is of a lower metamorphic grade than Pzrgmsv and consists of gray, green, black, and tan slate and siltstone interbedded with green to gray",null,null,"RB004",112,"Ruby","Meta",5133,"JMtu"]
["Pzrgmsv","Rampart Group","Paleozoic","Argillaceous and arenaceous rocks, siliceous and calcareous chemical sedimentary rocks and volcanic rocks.  Pzrgmsv is of a higher metamorphic grade than Pzrgs and consists of phyllite or fine-grained quartz-muscovite-chlorite schist intercalated with me",null,null,"RB004",113,"Ruby","Meta",5133,"JMtu"]
["Pzrp","Ruby Phyllite","Paleozoic (?)","Graphitic phyllite with minor interbedded graphitic quartzite and quartzite.  Locally fine-grained graphitic schist and graphitic quartz-mica schist.  Hornfelsed when adjacent to TKg (not shown on map)",null,null,"RB004",115,"Ruby","Ign",5542,"TrMtqp"]
["Pzrm","Ruby Marble","Paleozoic (?)","Medium- to coarse-grained marble composed of calcite with minor musovite, pyrite, and diopside (?).  Probably correlative with Tamarack Bluff limestone",null,null,"RB004",117,"Ruby","Meta",6905,"Dm"]
["Pztbl","Tamarack Bluff Limestone","Paleozoic (?)","Marble and recrystallized limestone, dominantly fine- to coarse-grained calcitic marble, with some sedimentary structures preserved.  Probably correlative with Ruby Marble",null,null,"RB004",116,"Ruby","Meta",8620,"Pzrm"]
["PzpCs","Pelitic Schist","Precambrian and/or Paleozoic","Fine- to medium-grained graphitic quartz-muscovite +/- chlorite schist.  Minerology consistent with greenschist facies metamorphism",null,null,"RB004",118,"Ruby","Meta",8601,"PzZrqs"]
["PzpCsg","Pelitic Schist and Gneiss","Precambrian and/or Paleozoic","Medium- to coarse-grained quartz +/- muscovite +/- chlorite +/- biotite +/- grapphite +/- garnet +/- staurolite schist, quartzofeldspathic orthogneiss, and foliated greenstone.  Minerology consistant with amphibolite facies metamorphism",null,null,"RB004",119,"Ruby","Meta",8801,"PzZrpg"]
["TKv","Volcanic and Sedimentary rocks","Tertiary (?) and/or Cretaceous (?)","Porphyritic basalt, andesite, and rhyolite flows, tuffs, and breccias with minor intercalated siltstone and sandstone",null,null,"RB004",120,"Ruby","Ign",1605,"TKvi"]
["Pg","Graywacke, conglomerate and mudstone","Permian","Fine- to medium-grained graywacke, graywacke conglomerate with basalt, andesite, shale, chert, quartzite, and schist clasts, and green to gray mudstone.  Possibly correlative to graywacke of Rampart Group.","microfossils of probable Permian age",null,"RB004",121,"Ruby","Sed",5745,"Pig"]
["MDc","Chert and Slate","Mississippian and Devonian","Thin-banded grey, green, and red chert with thin interbeds of slate","Chert contains radiolarians of Devonian, Mississippian(?), and Mississippian age",null,"RB004",122,"Ruby","Meta",6390,"TrMica"]
["Qs","Undifferentiated Quaternary Deposits","Quaternary","Undifferentiated Quaternary deposits",null,null,"TK003",200,"Talkeetna Mountains","Unconsol",100,null]
["KJs","Carbonate and Sandstone","Mesozoic","Slightly calcareous interbedded polymictic conglomerate, lithic graywacke, siltstone and shale.  Correlative with Kahiltna flysch basin (or terrane) of Jones and others (1981) and the Gravina-Nutzotin flysch belt of Richter (1976)","late Jurassic fossil assemblage",null,"TK003",10121,"Talkeetna Mountains","Sed",2850,"KJf"]
["Trl","Limestone and Shale","Triassic","Light grey to dark grey carbonaceous limestone lenses and shale of the mafic metavolcanics and associated sediments of the Amphitheter Group","Monotis sp. of Late Triassic age",null,"TK003",10145,"Talkeetna Mountains","Sed",4030,"JTrlm"]
["Trmb","Mafic Basalt","Triassic","Very dark green-grey to reddish-oxidized, medium- to coarse-grained, mafic metabasalt of the mafic metavolcanics and associated sediments of the Amphitheter Group",null,null,"TK003",10141,"Talkeetna Mountains","Ign",4420,"Trn"]
["Trab","Partial marine and subareal amygdaloidal basalt flows, basaltic and andesitic tuffs, flows, dikes, sills, and agglomerates","Triassic","Dark to medium green, generally altered, partial marine and subareal amygdaloidal basalt flows, basaltic and andesitic tuffs, flows, dikes, sills, and agglomerates of the mafic metavolcanics and associated sediments of the Amphitheter Group",null,null,"TK003",10142,"Talkeetna Mountains","Ign",4420,"Trn"]
["Tra","Pillow basalt and andesite","Triassic","Submarine erruptive sequence of dark green, fine- to coarse-grained, pillow metabasalt and andesite of the mafic metavolcanics and associated sediments of the Amphitheter Group",null,null,"TK003",10143,"Talkeetna Mountains","Ign",4422,"Trn"]
["Pac","Light grey to medium grey meta-argillite, metachert, and cherty argillite intercalated with very fine-grained siliceous aquagene tuff","Permian","Light grey to medium grey meta-argillite, metachert, and cherty argillite intercalated with very fine-grained siliceous aquagene tuff.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokelberg and Fisher (198",null,null,"TK003",10124,"Talkeetna Mountains","Meta",5950,"Pe"]
["Pvt","Meta-andesite flows, tuff, and metasandstone","Permian","Olive green, medium-grained volcaniclastic crystal lithic tuff, pyroxene-hornblende meta-andesite flows, and metasandstone.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokelberg and Fisher (1989).  Sectio",null,null,"TK003",123,"Talkeetna Mountains","Meta",5630,"PPasc"]
["lPsmv","Sheared mafic volcanic rocks","Permian","Medium greenish-grey, sheared meta-andesite and metadacite flow rocks.  Minor sheared lapilli tuff.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokelberg and Fisher (1989).  Section includes the Mankomen",null,null,"TK003",10150,"Talkeetna Mountains","Meta",6120,"Pat"]
["ulPla","Impure somewhat recrystallized siliceous bioclastic limestone, chert and minor quartzite","Permian","Light grey fine- to medium-grained, impure, siliceous bioclastic limestone with quartz and argillitic angular lithic detritus.  Chert and minor quartzite.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokel","Late Wolcampian to Leonardian (middle to late Early Permian) and Leonardian to Guadolupian (late Early to Early Late Permian) conodonts",null,"TK003",10129,"Talkeetna Mountains","Sed",5955,"PPaskm"]
["Pmvs","Metabasalt, meta-andesite, and metadacite","Permian","Undifferentiated altered volcanic flows, pyroclastics, and tuff.  Metabasalt, meta-andesite, and metadacite.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokelberg and Fisher (1989).  Section includes the",null,null,"TK003",10125,"Talkeetna Mountains","Meta",5630,"PPasc"]
["Pat","Aquagene tuff, argillite and metasandstone","Permian","Dark grey to black, crystal-rich aquagene tuff with interbedded dark green-grey fine-grained volcaniclastic metasandstone and cherty argillite.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane of Nokelberg and Fi",null,null,"TK003",10126,"Talkeetna Mountains","Meta",5630,"PPasc"]
["lPls","Silicious bioclastic limestone and argillite","Permian","Light- to medium-grey, very fine-grained, laminated siliceous bioclastic limestone composed of fine-grained carbonate, chert, angular quartz, and pelitic material.  Low grade regional metamorphism.  Correlated with lower portions of the Tangle subterrane","Crinoid columnal-rich carbonate layers yield late Wolfcampian conodonts",null,"TK003",10128,"Talkeetna Mountains","Sed",5955,"PPaskm"]
["Tsk","Skarn","Permian","Skarn formed adjacent to TKif by lPls (not likely this unit)",null,null,"TK003",10160,"Talkeetna Mountains","Sed",4030,"JTrlm"]
["uPzdt","Dolomite and metatuff","Late Paleozoic","Distinctive white dolomitic marble and tan to green metatuff.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correlated with the metamorphic complex of the Gulkana River of Nokelberg and",null,null,"TK003",10130,"Talkeetna Mountains","Meta",5955,"PPaskm"]
["uPzfv","Silicified felsic metatuffs and metarhyolite to metadacite flows","Late Paleozoic","Silicified felsic metatuffs and metarhyolite to metadacite flows intercalated with minor marble and dolomitic marble.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correlated with the me",null,null,"TK003",10131,"Talkeetna Mountains","Meta",5625,"PPast"]
["uPzsv","Mafic metabasalts, metaandesites, agglomerates, minor impure carbonates and pelitic semischists","Late Paleozoic","Mafic metabasalts, metaandesites, agglomerates, minor impure carbonates, and pelitic semischists.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correlated with the metamorphic complex of",null,null,"TK003",10132,"Talkeetna Mountains","Meta",5550,"PPast"]
["uPzsl","Metapelites, mainly dark slate and phyllites","Late Paleozoic","Metapelites, mainly dark slate and phyllites.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correlated with the metamorphic complex of the Gulkana River of Nokelberg and others (1989) an",null,null,"TK003",10133,"Talkeetna Mountains","Meta",5950,"Pe"]
["uPzas","Pelitic and mafic metavolcanic schist and amphibolite","Late Paleozoic","Brown to grey, biotite-rich, quartz, feldspar, pelitic and mafic metavolcanic schist.  Massive, fine-grained hornblende amphibolite.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correla",null,null,"TK003",10134,"Talkeetna Mountains","Meta",5920,"PPast"]
["TKif","Felsite and fine grained granite plugs","Tertiary and Cretaceous","Highly altered and weathered small bodies of felsite and fine grained granite plugs",null,null,"TK003",10112,"Talkeetna Mountains","Ign",1655,"TKg"]
["Kqm","Quartz monzonite","Cretaceous","Medium-grained, equigranular biotite quartz monzonite",null,"Probably similar to other Late Cretaceous plutons in the region radiometrically dated by Turner and Smith (1974)","TK003",10116,"Talkeetna Mountains","Ign",2470,"Kg"]
["Tqd","Medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite","Cretaceous","Medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite",null,null,"TK003",10117,"Talkeetna Mountains","Ign",2540,"Kg"]
["Tqd-f","Foliated medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite","Cretaceous","Foliated medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite",null,null,"TK003",10118,"Talkeetna Mountains","Ign",2540,"Kg"]
["Tqd-p","Porphyritic medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite","Cretaceous","Porphyritic medium- to coarse-grained, generally equigranular, hypidiomorphic pyroxene-hornblende diorite",null,null,"TK003",10140,"Talkeetna Mountains","Ign",2540,"Kg"]
["Kgab","Gabbro","Cretaceous","Medium to dark grey, eqigranular, pyroxene-hornblende rich gabbro",null,null,"TK003",10115,"Talkeetna Mountains","Ign",2440,"Kmum"]
["Mzms","Diorite, gabbro, picrite, and pyroxenite sill and dike swarm complex","Mesozoic","Diorite, gabbro, picrite, and pyroxenite, ultramafic sill and dike swarm complex.  Also hypabyssal stocks and laccoliths",null,null,"TK003",10127,"Talkeetna Mountains","Ign",5245,"JPaur"]
["KJgd","Granodiorite","Cretaceous and Jurassic","Light to medium grey, medium-grained equigranular to gneissic biotite-hornblende granodiorite",null,null,"TK003",10119,"Talkeetna Mountains","Ign",3402,"Jgd"]
["KJgd-f","Foliated Granodiorite","Cretaceous and Jurassic","Foliated light to medium grey, medium-grained equigranular to gneissic biotite-hornblende granodiorite.  Unit not distinguished on map.",null,null,"TK003",10120,"Talkeetna Mountains","Ign",3402,"Jgd"]
["gossan","gossan",null,"gossan",null,null,"TK003",110,"Talkeetna Mountains","Unconsol",null,null]
["Trap","Pillow basalt and andesite displaying structures","Triassic","Lava tubes and pillow structures of Tra, which is submarine erruptive sequence of dark green, fine- to coarse-grained, pillow metabasalt and andesite of the mafic metavolcanics and associated sediments of the Amphitheter Group",null,null,"TK003",10144,"Talkeetna Mountains","Ign",4422,"Trn"]
["uPzsvh","Hornfelsed mafic metabasalts, metaandesites, agglomerates, minor impure carbonates and pelitic semischists","Late Paleozoic","Hornfelsed mafic metabasalts, metaandesites, agglomerates, minor impure carbonates, and pelitic semischists.  Regionally metamorphosed from prehnite-pumpellyite through lower greenschist to amphibolite metamorphic facies.  Correlated with the metamorphic",null,null,"TK003",10136,"Talkeetna Mountains","Meta",25550,null]
["Hf",null,null,"Two outcrops within KJgd, on the southern boundary of the map.",null,null,"TK003",111,"Talkeetna Mountains",null,null,null]
["TKir",null,"Tertiary and Cretaceous","May be a typo on the map.  If so, this is TKif",null,null,"TK003",10113,"Talkeetna Mountains","Ign",1655,"TKg"]
["Kgd-f",null,"Cretaceous","In the Kqm description, a unit named Kgd is described as a quartz diorite.  This may be a foliated quartz diorite.  May also be a typo.  If so, it may be Kqd-f or KJgd-f.",null,null,"TK003",10114,"Talkeetna Mountains","Ign",2540,"Kg"]
["KJgn",null,"Cretaceous and Jurassic","One outcrop on the southern boundary of the map.",null,null,"TK003",10122,"Talkeetna Mountains",null,3402,"Jgd"]
["uPzsm",null,"Late Paleozoic","One outcrop on the southern boundary of the map.",null,null,"TK003",135,"Talkeetna Mountains","Meta",5955,"PPaskm"]
["KJwc","Wilber Creek and Wolverine quartzite units, undivided","Cretaceous and Jurassic","Wilber Creek and Wolverine quartzite units, undivided (TN003 modified, shown as southern TrPs)",null,null,"TN003",2812,"Tanana","Sed",2812,"KJwc"]
["Trc","Carbonatite","Triassic","Magnetite-rich carbonatite.",null,null,"TN004",3495,"Tanana","Ign",4340,"Trc"]
["Dql","Quail unit, basal limestone","Late Devonian?","Local biogenic limestone buildups in basal Quail unit, deposited on the Troublsome unit.  Are as much as 30 m thick and have a lateral extent of several hundred meters.",null,null,"LG002",840,"Livengood","Sed",6930,"DSl"]
["TKv","Volcanic rock","Tertiary to Late Cretaceous","Indian River, Takhakhdona Hills, and Dulbi River areas- light-gray to pink rhyolite tuff, welded (?) tuff, flows, and breccia.  Subordinate pumice, dark vitrophyre, and obsidian.  In Takhakhdona Hills also includesdark-green to black vesicular basalt flo","Obsidian chippings and artifacts found in archeological site in NW AK may have source in obsidian occurrence north of Little Indian River.","Flows in Tanana and Bettles quads have K-Ar date of 58 m.y.","MZ002",210,"Melozitna","Ign",1603,"TKvr"]
["Kg","Granodiorite","Late Cretaceous?","Two small plutons in the se part of quadrangle.  Fine- to medium-grained  hornblende-biotite granodiorite with subordinate quartz monzonite and quartz diorite.  Distinguished from others to the north by Bill Patton (March, 1999)",null,"K-Ar date of 82.3 and 89.0 m.y. from the Dulbatna Mountain pluton and 81.5 m.y. from the Indian Mountain pluton in adjoining Hughes quad","MZ002",300,"Melozitna","Ign",2460,"Kg"]
["Dq","Quail unit, revision","Late Devonian?","Conglomerate, phyllite, calc-phyllite, siltstone, and sandstone.  Part of unit recorrelated to Cascaden Ridge equil.",null,null,"LG002",844,"Livengood","Sed",6940,"Dcb"]
["Dt","Troublesome unit","Devonian(?)","Argillite, chert, and mafic intrusive and extrusive rocks",null,null,"LG002",846,"Livengood","Sed",6910,"Dtr"]
["Mog","Orthogneiss","Devonian","Orthogneiss",null,"U/Pb age 350 Ma, protolith(?) age","LG003",6521,"Livengood","Ign",6521,"MDyao"]
["JMr","Rampart Group and associated mafic intrusive rocks, undivided","Mississippian to Jurassic","Rampart Group volcanic and sedimentary rock sequence, mafic rocks divided out",null,null,"TN003",5133,"Tanana","Ign",5130,"JTrtmu"]
["Jsc","Serpentinite and or carbonatite","Jurassic?","Carbonatite of unit Jsc",null,null,"TN003",3495,"Tanana","Ign",4340,"Trc"]
["Kwcq","Wilber Creek unit of Weber and others (1992), quartzite","Early Cretaceous","Brown, argillaceous, impure quartzite and graywacke sandstone; locally mappable within dominantly argillaceous and graywacke section.",null,null,"TN003",2118,"Tanana","Sed",2115,"Kwcf"]
["JMr","Rampart Group and associated mafic intrusive rocks, undivided","Mississippian to Jurassic","Rampart Group volcanic and sedimentary rock sequence, mafic rocks divided out",null,null,"TN003",5132,"Tanana","Ign",5132,"JMtru"]
["PzpCsq","Schist and Quartzite","Paleozoic or Precambrian","Quartz-muscovite-biotite schist, quartz-muscovite schist, quartzite, and amphibole schist; locally garnetiferous.  Upper greenschist to lower amphibolite facies.  Age unknown.  Unit subdivided on published OFR98-133 into PzZysa and PzZysq.",null,null,"BD002",451,"Big Delta","Meta",8630,"PzZysa"]
["bc","Birch Creek Schist","Uncertain but believe to be early  Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",9322,"PzZaqs"]
["bc","Birch Creek Schist","Uncertain but believe to be early Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",6511,"MDt?"]
["bc","Birch Creek Schist","Uncertain but believe to be early  Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",8630,"PzZysa"]
["bc","Birch Creek Schist","Paleozoic","Birch Creek Schist, part correlated with Spruce Creek sequence of Kantishna Hills from Bundtzen thesis",null,null,"FB002",600,"Fairbanks","Meta",5666,"Pzsc"]
["bc","Birch Creek Schist","Uncertain but believe to be early  Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",5660,"Pzk"]
["bc","Birch Creek Schist","Uncertain but believe to be early  Paleozoic or Precambrian","Light- to dark-gray, reddish-brown to tan-weathering schists, predominately quartz-sericite schist and micaeous quartzite.  Includes mu-bio schist, garnet-mica schist, calcite-and dolomite-bearing schist, chloritic and graphitic schist, amphibolite, impu",null,"120 m.y. to 1,170 m.y.","FB002",600,"Fairbanks","Meta",5662,"Pzkcp"]
["MDt?","Totatlanika Schist?","Mississippian or Devonian","Metavolcanic and metavolcaniclastic rocks. Unit added based on Bundtzen and Weber",null,null,"KH005",6511,"Kantishna River","Meta",6511,"MDt?"]
["Kg","Granite?","Late Cretaceous","Unit not described on source map -- missing from legend",null,"Lead-alpha age 55-60 Ma, highly suspect.","RB005",111,"Ruby","Ign",2460,"Kg"]
["Kg","Granitic rocks","probably Late Cretaceous and Early Cretaceous","Chiefly quartz monzonite in Kokrines Hills",null,"K-Ar date of 111 Ma in Melozitna quad.","RB004",2410,"Ruby","Ign",2530,"Kg"]
["Unk","Unknown",null,"Where did this come from?",null,null,"RB?",0,"Ruby","Ign",4210,"Trn"]
["mcb","Metamorphic complex","Precambrian or Paleozoic","The younger unit, mcb, contains schist and quatzite with some crystalline limestone, slate, and greenstone.  Part of unit recorrelated (D.N. Bradley, USGS, pers commun., 1998)",null,null,"RB002",503,"Ruby","Meta",7580,"SCpl"]
["mca","Metamorphic complex","Precambrian or Paleozoic","In eastern part of quad, metamorphic complex mapped as two units, mca and mcb.   The older unit, mca is composed of  crystalline limestone and greenstone with some schist and phyllite.",null,null,"RB002",504,"Ruby","Meta",8600,"YZnm"]
["pCm","Meta-quartz diorite","middle Proterozoic?","Sheared metamorphosed porphyritic quartz diorite",null,"K-Ar on biotite 921 +/- 25 Ma, mouscovite in border zone 663+/- 20 Ma","RB007",8710,"Ruby","Meta",8710,"Ynqd"]
["KJqa","Quartzite, argilllite, conglomerate, and hornfels","Cretaceous and/or Jurassic","Mostly gray, fine- to medium-grained quartzite, interlayered with mostly gray, greenish-gray, reddish-gray, and tan argillite (1 northwesternmost polygon at CI-LG quad boundary",null,null,"CI002",400,"Circle","Meta",2115,"Kwcf"]
["Kg","Granite","Cretaceous","Chloritized porphyritc (hornblende) biotite monzograinte.  Also includes rocks mapped as units Kgp and Kgrd, granite or granodiorite(?) porphyry and granodiorite.",null,"K-Ar ages range from 57 +/- 2Ma to 71 +/- 2 Ma;  Ar-Ar studies suggest a likely age of 90 Ma","CI005",2460,"Circle","Ign",2460,"Kg"]
["Kwcf","Quartzite, argilllite, conglomerate, and hornfels","Cretaceous and/or Jurassic","Mostly gray, fine- to medium-grained quartzite, interlayered with mostly gray, greenish-gray, reddish-gray, and tan argillite",null,null,"CI003",5500,"Circle","Sed",2115,"Kwcf"]
["SOs","Siltstone, dolomite, chert, and mafic igneous rocks","Silurian and/or Ordovician","Gray, black, or olive-gray siltstone and argillite and mudstone.  Tan dolomite, gray to dark-gray fine-grained limestone, gray or dark-gray chert.  Mafic igneous rocks are dikes, sills, and small lense-like bodies of dark-greenish-black gabbro and basalt",null,null,"CI002",6250,"Circle","Ign",7610,"Ofc"]
["PzZm","Gabbro and diorite","Paleozoic or preCambrian","Gabbro and diorite and some sedimentary rocks of unknown affinity",null,null,"CI003",6500,"Circle","Ign",8450,"MzZum"]
["unk","Limestone","Paleozoic and or preCambrian","Various limestone symbol shown on Circle map in a variety of rock units.  No further description in text.  Includes on southern polygons of unit",null,null,"CI002",1900,"Circle","Sed",8430,"ls"]
["ch","Chert","Paleozoic and or preCambrian","Various chert symbols shown on Circle map in a variety of rock units.  No further description in text.  Assigned to Rampart-Tozitna sedimentary rock unit on the basis of location.",null,null,"CI002",1910,"Circle","Sed",5020,"TrMts"]
["PzpCq","Quartzite and quartzitic schists","Paleozoic and/or Precambrian","Gray or greenish-gray quartzite and quartzitic schists are dominant rock types.  Minor pelitic schist, calc-silicate, mafic schist, and rare marble are interlayered with quartzite and quartzitic schists.",null,null,"CI002",1600,"Circle","Meta",9320,"PzZyqs"]
["PzpCa","Argillite, grit, and quartzite","Paleozoic and/or Precambrian","Gray, maroon, and green slaty argillite interlayered with gray and greenish-gray grit and quartzite.  Minor limestone in southern part of exposure.  Western exposures in part.",null,null,"CI002",1000,"Circle","Meta",8310,"CZwa"]
["Kgs","Graywacke sandstone and mudstone","Early(?) Cretaceous","Chiefly dark-greenish gray to pale-olive tuffaceous and feldspathic fine-to-very coarse-grained sandstone.  Subordinate dark-gray mudstone.  Many sandstone beds distinctly mottled due to partial zeolitization of volcanic material.","Association and gradational(?) with units containing Buchia of earliest Cretaceous age.",null,"KT002",200,"Kateel River","Sed",2180,"Kvm"]
["KJv","Andesitic volcanic rocks - Roundabout Mountain volcanic field","Cretaceous and Jurassic(?)","Chiefly porphyritic pyroxene andesite and trachyandesite flows, andesitic crystal and lithic tuff, and massive andesite breccia, agglomerate, and conglomerate.  Commonly altered and therefore pale green.  Interbedded dark-greenish-gray tuffaceous graywac",null,null,"KT003",801,"Kateel River","Ign",1081,"Tvb"]
["Knm","Undifferentiated sedimentary rocks","Cretaceous","Undifferientiated units Km and Kn.  Units on east side of quadrangle reassigned to unit Kvg (NSA 2180).",null,null,"KT002",212,"Kateel River","Sed",2180,"Kvm"]
["OCls","Lyman Hills Formation","Cambrian to Ordovician","Lime rich zone in the Lyman Hills Formation after Bundtzen and others (1997); part of Farewell Composite terrane and Dillinger subterrane",null,null,"LH004",7582,"Lime Hills","Sed",7580,"SCpl"]
["Tnep","Northeast Prong, Tired Pup pluton","middle Tertiary","Large fine- to coarse-grained seriate, biotite or biotite-amphibole granite pluton.",null,"K-Ar biotite ranging from 25.4 to 26.7 Ma","LH004",902,"Lime Hills","Ign",1270,"Togr"]
["Pzu","Sedimentary rocks (limey)","Paleozoic","Sedimentary rocks. Undifferentiated shale, siltstone, argillite, and limestone.  Fossils, chiefly grapotlites, collected from these rocks are Late Cambrian(?), Ordovician, Silurian, and Devonian in age.  Tentatively correlated with Dilinger sequence of s",null,null,"LH002",190,"Lime Hills","Sed",2850,"KJf"]
["TKm","Diorite, monzonite, and quartz syenite","Latest Cretaceous, earliest Tertiary","Light to medium-gray biotite-aegerine-olivine diorite, monzonite, and subordinate quartz syenite.  Forms bulk of Cripple Creek Mountains pluton.",null,"K-Ar age of 71.3 Ma","MD003",1660,"Medfra","Ign",1660,"TKm"]
["TKm","Diorite, monzonite, and quartz syenite","Latest Cretaceous, earliest Tertiary","Light to medium-gray biotite-aegerine-olivine diorite, monzonite, and subordinate quartz syenite.  Forms bulk of Cripple Creek Mountains pluton.",null,"K-Ar age of 71.3 Ma","OP003",1660,"Medfra","Ign",1660,"TKm"]
["Kcvs/Kcs","Coarse-grained volcaniclastic sandstone and conglomerate","earliest Cretaceous","Greenish gray, poorly sorted fine- to coarse-grained lithic-volcaniclastic sandstone and pebble conglomerate composed chiefly of volcanic rock and chert detritus, and quartz.","Inoceramus",null,"MD003",2180,"Medfra","Sed",2180,"Kvm"]
["OCl","Unknown","Cambrian and Ordovician","Unit not described.  Sinlge polygon located north of coal-bearing sedimentary rocks in the southwestern McGrath quadrangle.",null,null,"MG003",630,"McGrath","Sed",7520,"Ont"]
["PzpCs","Greenschist and quartz mica schist","early Paleozoic or preCambrian","Medium-gray to medium-green, medium- to coarse-grained, schistose, foliated, actinolite-chlorite-epidote greenschist and biotite-chlorite-albite-quartz schist.",null,null,"MD003",8601,"Medfra","Meta",8601,"PzZrqs"]
["TrMc","Banded chert and argillite","Pennsylvanian and Mississippian","Medium- to dark-gray, green, and some red radiolarian chert. interbedded dark-gray argillite, and very minor tuffaceous volcanic rocks","Radiolarians",null,"MD003",6080,"Medfra","Sed",6080,"TrMica"]
["JTrt; JTrma","Siliceous tuff, crystal and lithic tuffs, and metasiltstone and Mafic volcanic breccia, tuff, siltstone, chert, and agglomerate","Triassic and early Jurassic","Dark-greenish, very fine grained cherty tuff grading into greenish-gray radiolarian chert.  Fine to coarse-grained dark greenish-gray crystal and lithic tuff.  Volcanic breccia and conglomerate composed of poorly sorted clasts of mafic volcanic rocks and","Radiolaria and conodonts reported by Patton and others, 1980 (MD002)",null,"MD003",3851,"Medfra","Ign",3851,"JTrta"]
["TrMv; TrMcs","Mafic tuff, volcaniclastic sandstone, and minor mafic flows and Calcareous, lithic pebble sandstone","Triassic to Mississippian","Medium- to dark-gray, coarse-grained augite-plagioclase-rich mafic tuff, volcaniclastic sandstone, and porphyritic basaltic andesite and basalt.  Also, light- to medium-green-gray, medium- to coarse-grained, commonly calcareous lithic pebble sandstone an","Veghicyclia spp., Pseudoheliodiscus spp., and Sarla spp. of Norian age and Crytostome bryozoan, brachiopod and pelmatozoan fragments of probable late Paleozoic age",null,"MD003",5021,"Medfra","Sed",5021,"TrMis"]
["Km","Augen orthogniess","Early Cretaceous","Gnessic phase in southern part of the Melozitna pluton now recognized as augen orthogneiss.",null,null,"MZ002",370,"Melozitna","Meta",6522,"MDrao"]
["PzpCp?","Pelitic and quartzose schist sequence","Paleozoic and preCambrian?","Pelitic and quartzose schist sequence, recoded as Wickersham on northern part of map.",null,null,"MM002",8631,"Mount McKinley","Meta",8300,"CZw"]
["PzpCp","Pelitic and quartzose schist sequence","Paleozoic and preCambrian?","Pelitic and quartzose schist sequence.  Reclassified single polygon on the northeast part of map",null,null,"MM002",8630,"Mount McKinley","Meta",8300,"CZw"]
["Ksu?","Undifferentiated sedimentary rocks","Late and Early Cretaceous","Sandstone, shale, and conglomerate marine and nonmarine deltaic deposits in south and east part of quadrangle",null,null,"NL003",1940,"Nulato","Sed",2020,"Kme"]
["Kg","Turbidite deposits","Early Cretaceous","Graywacke and mudstone turbidite deposits.  Polygons north of Kaltag fault on west side of quadrangle of this unit reassigned to unit Ksm",null,null,"NL003",2105,"Nulato","Sed",2101,"Ksse"]
["Kg","Turbidite deposits","Early Cretaceous","Graywacke and mudstone turbidite deposits.  Polygons in extreme northwest of quadrangle of this unit reassigned to unit Kgw on DOG map, lumped back by W.W. Patton, Jr., (1999)",null,null,"NL003",2115,"Nulato","Sed",2180,"Kvm"]
["TrMb","Basalt, gabbro, diabase, tuff, and chert","Mississippian to Triassic",null,null,null,"NL003",5130,"Nulato","Ign",5140,"JMab"]
["TrMc","Banded chert and argillite","Triassic, Permian, Pennsylvanian, and Mississippian","Medium- to dark-gray, green, and some red radiolarian chert, interbedded dark-gray argillite, and very minor tuffaceous volcanic rocks.","Albaillella sp.(Middle and Late Mississippian), Latentibifistula sp. (Pennsylvanian and Permian), Capnodoce sp. (Triassic?)",null,"OP003",6080,"Ophir","Sed",5112,"TrMica"]
["Kcvs/Kcs","Coarse-grained volcaniclastic sandstone and conglomerate","earliest Cretaceous","Greenish gray, poorly sorted fine- to coarse-grained lithic-volcaniclastic sandstone and pebble conglomerate composed chiefly of volcanic rock and chert detritus, and quartz.","Inoceramus",null,"OP003",2180,"Ophir","Sed",2180,"Kvm"]
["JTrt; JTrma","Siliceous tuff, crystal and lithic tuffs, and metasiltstone and Mafic volcanic breccia, tuff, siltstone, chert, and agglomerate","Triassic and early Jurassic","Dark-greenish, very fine grained cherty tuff grading into greenish-gray radiolarian chert.  Fine to coarse-grained dark greenish-gray crystal and lithic tuff.  Volcanic breccia and conglomerate composed of poorly sorted clasts of mafic volcanic rocks and","Radiolaria and conodonts reported by Patton and others, 1980 (MD002)",null,"OP003",3851,"Ophir","Ign",3851,"JTrta"]
["TrMv; TrMcs","Mafic tuff, volcaniclastic sandstone, and minor mafic flows and Calcareous, lithic pebble sandstone","Triassic to Mississippian","Medium- to dark-gray, coarse-grained augite-plagioclase-rich mafic tuff, volcaniclastic sandstone, and porphyritic basaltic andesite and basalt.  Also, light- to medium-green-gray, medium- to coarse-grained, commonly calcareous lithic pebble sandstone an","Veghicyclia spp., Pseudoheliodiscus spp., and Sarla spp. of Norian age and Crytostome bryozoan, brachiopod and pelmatozoan fragments of probable late Paleozoic age",null,"OP003",5021,"Ophir","Sed",5021,"TrMis"]
["PzpCs","Schistose metamorphic rocks","Early Paleozoic or Late Precambrian","Schistose metamorphic rocks -- Unit on northern edge of map recorrelated based on information from Bill Patton",null,null,"OP002",802,"Ophir","Meta",5542,"TrMtqp"]
["TrMs","None","Triassic, Permian, Pennsylvanian, and Mississippian","Sandstone, grit, and argillite -- some polygons in northeast part of map reassigned to unit PzpCph, per Bundtzen and others (1997)",null,null,"OP003",601,"Ophir","Sed",8601,"PzZrqs"]
["Jdr","Dishna River mafic and ultramafic rocks","Jurassic","Dishna River mafic and ultramafic rocks extension into Ophir quadrangle",null,null,"OP002",600,"Ophir","Ign",5191,"Jium"]
["TKva","Basaltic andesite, basalt, and lapilli tuff","Tertiary(?) and Cretaceous","Medium-greenish-gray, aphanitic to fine-grained, porphyritic, hornblende-rich basaltic andesite; uncommon basalt and very fine grained lapilli tuff(?)",null,null,"OP003",1600,"Ophir","Ign",1600,"TKv"]
["Ksu?","Undifferentiated sedimentary rocks -- conglomerate facies","Late and Early Cretaceous","Sandstone, shale, and conglomerate marine and nonmarine deltaic deposits in southwest part of quadrangle.  Addition of subdivision by W.W. Patton, Jr., 1999",null,null,"NL004",1940,"Nulato","Sed",2024,"Kccf"]
["QTi","Intrusive rocks","Pleistocene and Pliocene (?)","Intrusive rocks",null,null,"VA002",460,"Valdez","Ign",460,"QTi"]
["mc","Metamorphic complex","Precambrian or Paleozoic","Schist, crystalline limestone, quartzite, greenstone, slate, and phyllite.  Areas of crystalline limestone mapped separately when possible as mcl.",null,null,"RB002",501,"Ruby","Meta",9325,"PzZrqs"]
["KJs","Undivided marine sedimentary rocks","Cretaceous and Early Jurassic","Medium- to dark-gray, generally isoclinally folded, thick sequence of lithic graywacke, phyllite, and shale with local lenses of quartz-chert conglomerate.  Minor fossiliferous limestone, radiolarian chert, and red ferruginous sandstone and siltstone.  [","Inoceramus, ammonites, brachiopods, and pelecypods",null,"TL002",301,"Talkeetna","Sed",3140,"Jtxc"]
["KJs","Undivided marine sedimentary rocks","Cretaceous and Early Jurassic","Medium- to dark-gray, generally isoclinally folded, thick sequence of lithic graywacke, phyllite, and shale with local lenses of quartz-chert conglomerate.  Minor fossiliferous limestone, radiolarian chert, and red ferruginous sandstone and siltstone.  [","Inoceramus, ammonites, brachiopods, and pelecypods",null,"TL002",301,"Talkeetna","Sed",3210,"JTrtv"]
["Kag","Argillite and lithic graywacke","Early Cretaceous","These rocks occur in a monotous, intensely deformed flyschlike turbidite sequence, probably several thousand meters thick.  The rocks are highly indurated, and many are sheared and pervasively cleaved.  Most cleavage is axial plane cleavage.  The argilli","poorly preserved fossils of  Incoceramus sp.; a block of Buchia-bearing limestone was found in float.",null,"TK002",510,"Talkeetna Mountains","Sed",2850,"KJf"]