bu
Bedrock of unknown type or age, Rubble of metasiltstone and chert,
nm
Areas not to be filled that lie within coverage, typically not mapped
Qs
Surficial deposits, undifferentiated
g
Ice fields or glaciers
Water (streams, lakes, ocean)
Qad
Avalanche deposits
Qa
Alluvium
Qaf
Alluvial fan and talus deposits
Qc
Colluvium
Qls
Landslide deposits
Qt
Terrace deposits
Qac
Abandoned channel deposits
Ql
Lacustrine deposits
Qsw
Swamp deposits
Qb
Beach deposits
Qes
Estuarine deposits
Qmt
Marine terrace deposits
Qd
Dune deposits
Qfl
Loess, Fairbanks loess
Qsu
Frozen silt, undifferentiated
Qm
Glacial deposits, undivided, of Holocene and/or Pleistocene age
Qsg
Superglacial drift
Qrg
Rock glacier deposits
Qsf
Solifluction deposits
Qek
Esker deposits
Qhg
Drift, neoglacial
Qho
Outwash deposits, Neoglaciation
Qwu
Drift, undivided, Late Wisconsin-age glaciations, Aleknagik, Brooks Lake, and others
Qwr
Latest Wisconsin, Iliuk,  Riley Creek, and other glaciations
Qw2
Late Wisconsin, Newhalen and other till
Qw1
Late Wisconsin, Iliamna and other till
Qwo
Outwash deposits, late Wisconsin-age Glaciations
Qrd
Rock-defended terraces
Qat
Altiplanation terraces
Qew
Glaciations older than Late Wisconsin
Qow
Older Wisconsin age outwash
Qmi
Illinoian glaciations
Qmio
Outwash older than Wisconsin-age
Tmp
Pliocene(?) glaciations
QTs
Surficial deposits, undivided
QTmb
Semiconsolidated marine beach deposits
QTg
High-level gravel
QTf
Faneto Formation
Qpm
Placer and anthropogenic deposits
Qv
Volcanic rocks, undivided
Qw
Wrangell Lava, younger part
Qhv
Holocene volcanic rocks
Qpd
Pyroclastic (Ash and debris flow) deposits
Qafd
Ash-flow and ash-fall deposits
Qdf
Debris-flow deposits
Qmf
Mudflow deposits
Qav
Volcanic avalanche deposits
Qshc
Hyaloclastite or aquagene tuff
Qcs
Cinder and spatter cones
Qed
Explosion debris
Qvb
Basalt of Togiak River Valley, or basalt flows
QTb
Basalt
Qi
Intrusive rocks, undivided
Qvd
Dacitic to rhyolitic domes
Qanp
Andesite plug domes
Qds
Radial dike swarm and plug
QTv
Quaternary and/or Tertiary volcanic rocks, undifferentiated
QTa
Andesitic lava
QTw
Wrangell Lava
QTi
Intrusive rocks
QTqk
Quartz keratophyre dikes
QTad
Porphyritic dikes and stocks of hornblende andesite and dacite
QTva
Wrangell Lava, rhyodacite and rhyolite domes and associated pyroclastic rocks
Quaternary and/or Tertiary pyroclastic flow deposits
QTc
Quaternary or Tertiary metamorphic rocks, particularly in Mt. Dana area on Port Moller map
Tsu
Sedimentary rocks, undivided
Tmr
Milky River Formation
Tsf
Sterling Formation
Tkb
Beluga Formation
QTtg
Tugidak Formation,
Tkn
Kenai Group, undivided
Tn
Nenana Gravel, Pliocene and Miocene
Tn?
Nenana Gravel?
Tta
Tachilni Formation, Chuniksak Fm.
Tbl
Bear Lake Formation
Tnc
Narrow Cape Formation
Tun
Unalaska Formation
Tty
Tyonek Formation, undivided
Tu
Unga Formation (Conglomerate)  and Chirikof Fm.,
Tbe
Belkofski Formation
Ttyh
Tyonek Formation and Hemlock Conglomerate, undivided
Tcb
Coal-bearing rocks, Miocene? to Eocene?
Th
Hemlock Conglomerate and Nevidiskov Fm.
Tsk
Sitkinak Formation,
Tts
Tsadaka Formation
Tsi
Sitkalidak Formation,
Ttw
Tsadaka and Wishbone Formations, undivided.  Tsadaka is Miocene on (TK002), whereas it is Oligocene on (AN002); Wishbone is Eocene to Paleocene on (TK002) and Eocene on (AN002)
Tvs
Volcanic and sedimentary rocks, undivided, Oligocene and Eocene
Tst
Stepovak and Andrew Lake Formations
Tcl
Copper Lake Formation;
Twf
West Foreland Formation
Tt
Tolstoi Formation, Kulthieth Formation
Tw
Wishbone Formation
Tfv
early Eocene fluviatile and subordinate volcanic rocks
Tar
Arkose Ridge Formation
Tch
Chickaloon Formation
Tjc
Sedimentary rocks of Jarvis Creek coal field, undivided
Tos
Sedimentary rocks of the Orca Group, undivided
Tovs
Sedimentary and volcanic rocks of the Orca Group, undivided
Toc
Conglomerate of the Orca Group
Tvu
Tertiary volcanic rocks, undivided
Trs
Rhyolitic volcanic and sedimentary rocks
Tda
Dacite
Ta
Andesite; on map I-1685 unit Tau was subdivided for Alaska Peninsula map depending on location
Tb
Thf
Hypabyssal intrusive rocks of uncertain age
Hypabyssal felsic and intermediate intrusions.  Age range Paleocene to Miocene, mostly Early Tertiary or Eocene?
Thm
Hypabyssal mafic intrusions.  Age range varies, includes Miocene to Paleocene
Thd
Hornblende dacite of Jumbo dome
Tib
Intricate Basalt
Tpgu
Gibraltar Lake Tuff, Upper member
Tpgl
Gibraltar Lake Tuff, Lower member
Tv
Miocene volcanic rocks
Tab
Miocene and Pliocene andesite and basalt
Tba
Miocene basaltic andesite
Tdi
Miocene and/or Pliocene hypabyssal dacite and rhyolite intrusions, includes unit Tdp, Dacite plugs on I-1229; rhyolite and dacite dikes and sills
Tvr
Crystal and crystal-lithic ash-flow tuff
Tpb
Volcanic rocks, including basaltic breccia, tuff and a few pillow lava flows; Vega Bay Formation.  Also, volcanic rocks of Poul Creek Formation
Tvb
Meshik Volcanics (Formation); Mt. Galen volcanics; Ship Creek, Windy Fork, and Terra Cotta volcanic fields, McGrath
Basaltic lavas of the Meshik volcanic arc
Tvm
Andesitic and dacitic rocks of the Meshik volcanic arc
Tap
Andesite plug dome
Tp
Popof volcanic rocks, only in Shumagin Islands = Meshik
Tvab
Andesite and basalt flows
Tver
Moderately altered rhyolite flows, Nukluk Volcanic Field
Tvnb
Massive basalt and andesite, Nukluk Volcanic Field
Tvep
Tuff and breccia, Eocene or Paleocene
Tvei
Felsic hypabyssal intrusions [within unit Tfu of HC002]
Tov
Orca Group, volcanic rocks, undivided, Paleocene and Eocene?
Tcv
Cantwell Formation, volcanic rocks subunit
Tsr
Soda rhyolite and basalt
Tiu
Tertiary intrusive rocks, undivided
Tagr
Albite granite
Tgd
Granodiorite, undivided
Tgb
Gabbro and diorite, undivided
Tiv
Granitic and volcanic rocks, undivided.  Age range Oligocene to Paleocene
Ti
late Miocene and Pliocene granitic intrusive rocks of the Agripina Bay, Moss Cape, American Bay, and Devils batholith and other similar age plutons
Td
Diorite,
Tgg
Gabbro,
Togr
Granitic rocks
Toqd
Quartz diorite and diorite
Tobp
Oligocene basalt plug
Toegr
Toem
Granodiorite to tonalite
Tegr
Granite and granodiorite, Tertiary(?) Eocene?
Tfd
Felsic intrusions, leucocratic dikes, sills and small stocks, south of Border Ranges fault
Tgmp
Quartz monzonite, monzonite breccia, and quartz porphyry
Tet
Tonalite
Tg
Granitic rocks, including early Tertiary granitic intrusive rocks of the Kodiak, Shumagin, Semidi, and Sanak Islands
Thgd
Biotite-hornblende granodiorite,
Tim
Dark-colored dikes and sills consisting of diabase, basalt, dioritic and gabbroic mafic intrusive rocks
Tgl
Hornblende and pyroxene-hornblende gabbro
Tgma
Cottonwood Creek Complex, gniess and amphibolite
TKcg
Conglomerate, sandstone, and lignite
TKcs
Conglomerate and sandstone
Tk
Krugoli Formation, undifferentiated
Tkc
Basement rocks - coarse-grained and conglomeratic sedimentary rocks
TKv
Extrusive rocks, flows, tuff, and breccia
TKd
Dikes and subvolcanic rocks
TKgp
Hypabyssal granite porphyry dikes, sills, and plugs
TKvr
Volcanic rock, light gray to pink rhyolite
TKvd
Volcanic rocks, dacite
TKvi
Younger phase of Iditarod Volcanics and similar units
Felsic tuff
Rhyolite-andesite plugs and domes
Felsic volcanic rocks
TKiv
Mafic to intermediate volcano-plutonic complexes
TKmv
Flat-lying to gently dipping mafic flows of andesite and basalt, and volcaniclastic deposits of andesitic and basaltic tuff and conglomerate
TKum
Mafic and ultramafic intrusive rocks including pluglike body of augite andesite porphyry and a small dikelike body of augite peridotite
TKi
TKg
TKgd
More mafic granitic rocks, tonalite,  monzonite
TKqd
Granitic unit 3, quartz diorite and diorite dikes, stocks, and small plutons
TKgb
Gabbro and dark-colored dikes and sills consisting of diabase, basalt, dioritic and gabbroic mafic intrusive rocks
TDg
Gabbro, undifferentiated, Tertiary to Devonian age
TKl
Lamprophyre, alkali gabbro, and alkali diorite
TKc
Cataclastite
TKgg
Gneissose granitic rocks
TKgh
Ghost Rocks
TKmx
Orca Group melange
Knb
Undivided marine and non-marine shale and siltstone
Kcc
Limestone conglomerate
Kcvg
Calcareous graywacke and mudstone, volcanic graywacke, and volcanic conglomerate
Kcg
Calcareous graywacke and micaceous, calcareous mudstone turbidite deposits
Nonmarine and marine carbonate-rich conglomerate and sandstone deltaic deposits
Kcgc
Conglomeritic facies of carbonate-rich sandstone, siltstone, and shale turbidite deposits.
Ksh
Shale and siltstone
Ksa
Sandstone, Late Cretaceous
Kvss
Volcaniclastic sandstone
Kshf
Shumagin Formation
Kh
Hoodoo Formation
Ksmd
Shumagin Formation, mudstone member
Kkf
Kodiak Formation
Kcs
Cantwell Formation, sedimentary rocks subunit
Ku
Late Cretaceous undifferentiated clastic rocks
Kss
Non-marine sandstone, quartz conglomerate, shale, and siltstone
Kk
Limy volcaniclastic sandstone
Kshn
Non-marine shale, siltstone, and sandstone
Kkg
Kaguyak Formation
Kc
Chignik Formation
Khc
Chignik and Hoodoo Formations, undivided.  Also includes Late Cretaceous rocks called Kaguyak Fm. on the west side of Cook Inlet in the Seldovia quad
Kuskokwim Group, sandstone, siltstone, shale, and conglomerate
Kms
Minto unit, siltstone, mudstone, graywacke, quartzose sandstone, plant fragments, Late Cretaceous(?)
Kkn
Kuskokwim Group, nonmarine to marginal marine quartzose sandstone and siltstone
Kqc
Quartz-pebble conglomerate, early Late Cretaceous
Km
Matanuska Formation, fossiliferous marine shale, late Early Cretaceous to Late Cretaceous
Kme
Melozitna group, informal name; Shaktolik (sp) Group (abandoned name), graywacke, shale, grit, and conglomerate
Sandstone, shale, and conglomerate deltaic deposits  [see also 2180]
Ksi
Rhyolite and dacite, and sandstone, shale, and conglomerate deltaic deposits and intricately intruded areas of volcanic graywacke and mudstone, late Early Cretaceous (Albian)
Kipc
Igneous pebble-cobble conglomerate, Albian and Late Cretaceous?
Knls
Early Cretaceous Nelchina Limestone
Ksse
Marine sandstone and siltstone, Early Cretaceous
Kvgm
Volcanic graywacke and mudstone, late Early Cretaceous (Albian)
Kvcc
Conglomeratic facies, Volcanic conglomerate and breccia
Kbc
Berg Creek Formation
Kwcf
Early Cretaceous flysch, Wilber Creek unit
Kp
Pedmar Formation, Albian
Ksm
Quartz-carbonate sandstone and pebbly mudstone, Early Cretaceous, Valanginian-Aptian
Kba
Biederman Argillite, Kandik Group, Valanginian
Kcct
Cape Current terrane
Kkq
Keenan Quartzite, Kandik Group, Valanginian
Karg
Argillite, Early Cretaceous(?)
Khe
Herendeen Formation or Limestone on some maps;
Kli
Limestone, Early Cretaceous(?), primarily Inoceramus prisms
Kmd
Marine mudstone and sandstone
Kuc
Ungalik Conglomerate [Not used]
Kst
Staniukovich Formation
Kvm
Earliest Cretaceous volcanic graywacke and conglomerate
Earliest Cretaceous volcanic conglomerate
Kmk
McHugh Complex, Uyak Complex, melange
Kmar
Melange south of McKinley Fault
TrSl
Melange south of McKinley Fault, limestone blocks
Melange north of McKinley Fault [same as Kmy and Kmz in Healy quad?, subdivided also on map])
Melange north of McKinley Fault, limestone blocks ( (mnl)Kmn, HE002)
Kmu
Melange north of McKinley Fault, ultramafic rocks
Kvfp
Hypabyssal rocks, dacite and rhyolite porphyry
Kvb
Cretaceous basalt, local pillow flows, probably early Cretaceous
Ksva
Andesitic subvolcanic rocks
Ksvb
Basaltic subvolcanic rocks
Kvl
Iditarod Volcanics, Kipchuk Volcanic Field, and similar units, flows, tuff, and agglomerate
Kpd
Intermediate and silicic pyroclastic deposits
Ktg
Tuff, volcanic graywacke, and mudstone
Kva
Andesitic volcanic rocks (earliest Cretaceous, Neocomian, but may include Albian)
Kbd
Spilitic pillow basalt and diabase , see also 2230
Kcve
Chisana Formation, andesitic flows and volcaniclastic rocks, also includes Gravina Belt volcanics in southeast Alaska, which may also be in part Late Jurassic in age
Kdg
Dikes, granite to diorite
Kd
Basaltic andesite dikes
Kpg
Pegmatite
Kgu
Granitic Rocks
Kgt
Tourmaline bearing granite
Kgd
Granodiorite
Kqd
Quartz diorite
Kmum
Gabbro of Mount Moffit
Serpentinite, diabase, gabbro, and mafic volcaniclastic rocks
Kga
Alaskite [< 85 Ma]
Kgl
Granite [< 85 Ma]
Kgs
Syenite [< 85 Ma]
Kgk
Quartz monzonite, monzonite, and syenite [< 85 Ma]
Kgm
Granite
Kgdt
Serpentinized ultramafic rocks
Keg
Granite (lKgg, RB009) [Overprint symbol 14]
Slana pluton, hornblende granodiorite, Nabesna pluton, granodiorite and quartz diorite, Antler Creek pluton, syenodiorite, Border of Antler Creek pluton, hornblendite, Klein Creek pluton, granodiorite and quartz monzonite [>110 Ma]
Quartz-feldspar porphyry [>110 Ma]
Quartz monzonite [>110 Ma]
Kns
Nephelene syenite
Diorite, quartz diorite and syenodiorite [>110 Ma]
Ksy
Syenite
Ktt
Leucotonalite and trondjemite
Kgdc
Foliated (or cataclastic/mylonitic) quartz diorite
Kmi
Metamorphosed granitic rocks, wide range of compositions from quartz monzonite to diorite
Mzsa
Migmatite and migmatitic schist
Khg
Hornfels and gniess [Also gneissose areas within hornfels, largely on the Tanana geologic map
Metagabbro, metadiabase, and minor amphibolite
Kvs
Metasedimentary rocks of the Valdez Group
Kvv
Valdez Group, metavolcanic rocks, undivided
KJs
Argillite, chert, sandstone, and limestone
KJwc
Wilber Creek and Wolverine quartzite units, undivided
KJw
Wolverine unit, quartzite and interbedded shale and siltstone, Late Jurassic or Early Cretaceous
KJwq
Quartzite of the Wolverine quartzite unit
KJws
Sandstone and shale of the Wolverine quartzite unit
KJfn
Marine sedimentary rocks of Gravina-Nuzotin unit
KJcg
Conglomerate, sandstone, siltstone, shale, and volcanic rocks, westernmost outcrops of the Gravina-Nuzotin belt
KJfm
Metasedimentary rocks
KJf
Flysch sequence, Early Cretaceous and Late Jurassic
Flysch sequence (Early Cretaceous and Late Jurassic
Flysch sequence, Late Cretaceous to Late Jurassic (unit KJfl, HE002; KJm, MG002; KJs, TL002) [Overprint symbol 14]
KJvr
Vrain unit, pyritiferous shale and minor siltstone; not flysch, equivalent to upper part of Glenn Shale
KJgu
Glenn Shale, upper unit, Early Cretaceous to Middle Jurassic
KJv
Olivine basalt
KJvt
Tuffaceous subunit of unit MzPzat
KJcv
Chert and volcanic sequence (Late Cretaceous and(?) Jurassic,)
TJih
Highly altered hypabyssal rhyolite and dacite
JTrtv
Pillow basalt
KJg
Granitic rocks and minor monzonite
KJgg
Gabbro and diorite
KJmu
Ultramafic rocks (Early Cretaceous or Jurassic) [Compare to Kum (AN002)]
Marine metasedimentary rocks, flysch, Early Cretaceous and Late Jurassic, part of the Gravina-Nuzotin belt
Jsu
Jurassic sedimentary rocks, marine, undivided
Jn
Naknek Formation
Jnp
Naknek Formation, Pomeroy Arkose member (Jn (part), IL002; Jnp, IL006: IL007; KN005; SV004)
Jnn
Naknek Formation -- Northeast Creek Sandstone Member  (Jnn, AF008; CG004; IL006; IL007; KN005; KR002; KR004; MK004; MK005; NK004; PM002; SW002; SW004; UG004; Jns, UG002; JNss, SV004)
Jns
Naknek Formation -- Snug Harbor Siltstone Member  (Jns, AF002; AF008; CG004; IL006; IL007; KN005; PM002; KR004; MK004; MK005; SV004; SW002; SW004; UG004; Jnst, KR002; UG002; UG004)
Jni
Naknek Formation -- Indecision Creek Sandstone Member (Jni, AF002; CG004; IL006; KR004; MK004; MK005; PM002; SW002; SW004; UG004)
Jnk
Naknek Formation -- Katolinat Conglomerate Member (Jnk, MK005; UG004)
Jnc
Naknek Formation -- Chisik Conglomerate Member (Jnc, CG004; IL006; IL007; KN005; KR002; KR004; MK005; UG002; UG004)
Jnnc
Naknek Formation -- undivided Northeast Creek Sandstone Member and Chisik Conglomerate Member (Jnn, CG004; UG004)
Jnis
Naknek Formation -- undivided Indecision Creek Sandstone Member and Snug Harbor Siltstone Member (Jni, CG004; UG004)
Js
Shelikof Formation (Jss, Sandstone member, Jsst, Siltstone member, and Jsc, Conglomerate member, all on I-1685 now abandoned) [Shelikof Fm. is equivalent to the upper part of the Chinitna Fm. (Pavelof Siltstone Member)]
Jc
Chinitna Formation, Tonnie Siltstone Member
Jkt
Kotsina Conglomerate, Middle and/or Late Jurassic?
Juc
Unnamed marine sedimentary rocks, sandstone, siltstone, mudstone
Ja
Marine arkosic sandstone and argillite, Togiak terrane
Jtxc
Chinitna Formation and Tuxedni Group, undivided
Jtx
Tuxedni Group, undivided
Jk
Kialagvik Formation [Kialagvik Fm. is similar to the lower upper part of the Tuxedni Group]
JTrps
Tatina River volcanics, Upper member, phosphatic shale and volcaniclastic sandstone
Jtk
Talkeetna Formation [Listed as sedimentary rock unit above; varies, essentially volcanic in Cook Inlet region, sedimentary on Alaska Peninsula. Thought in part to be Late Triassic.]
JTrp
Phyllite and chert, possible Talkeetna stratigraphic equivalent [Compare with 3850]
Jmu
Ultramafic rocks including layered quartz gabbro Lumped units 3345, 3405, 3490, 3491, 3495, 3540, 3545
Jtr
Trondhjemite
Alkalic gabbro
Ji
Alaska-Aleutian Range batholith, undifferentiated
Jgr
Granite of Alaska-Aleutian Range batholith
Jgd
Granodiorite of Alaska-Aleutian Range batholith
Jqd
Quartz diorite of Alaska-Aleutian Range batholith and Chitina Valley batholith, quartz monzodiorite, quartz diorite, tonalite, and granodiorite
Jqt
Quartz diorite and tonalite
Jdg
Diorite and Gabbro of Alaska-Aleutian Range batholith
Jvab
Andesitic and basaltic flows, flow breccias and epiclastic marine rocks; younger than Talkeetna
Gabbronorite and other mafic and ultramafic rocks, Middle and Early Jurassic of Hidden terrane (Chugach Mountains)
Ultramafic and mafic rocks, Middle to Early Jurassic
Jtu
Cumulate ultramafic rocks
Harzburgite tectonite
Ultramafic and mafic rocks, Middle to Early Jurassic; Dishna River mafic and ultramafic rocks
Hornblende gabbro and leucogabbro (layered)
Ultramafic rocks, Early Jurassic or older
JTrg
Granodiorite of Taylor Mountain batholith and related(?) rocks
Jsy
Hornblende syenite porphyry
Jpmu
Metamorphic and plutonic rocks, undifferentiated, Jurassic,
Jsch
Schist of Kodiak Island, = Raspberry Schist of Roeske and others (1989).  Equivalent to Seldovia Schist and Schist of Iceberg Lake in Cook Inlet Region and Schist of Liberty Creek,
Migmatite border zone of granodiorite
Kps
Pelitic schist
JTrmc
McCarthy Formation, argillite and impure limestone (Early Jurassic-Late Triassic)
Limestone, shale, and chert (Early Jurassic(?)-Late Triassic (Norian)); newly recognized unit in Taylor Mtns.
JTrsu
Red and brown sedimentary rocks and basalt (Early Jurassic-Late Triassic)
JTrct
Crystal tuff, argillite, chert, graywacke, and limestone, deep marine, Late Jurassic to Late Triassic(?)
JTrta
Crystal tuff, argillite, chert, graywacke, and limestone, deep marine, Late Jurassic to Late Triassic(?), thought largely Triassic
Trk
Kamishak Formation [includes some volcanic rocks]
Trlb
Limestone and basalt sequence, Late Triassic, Norian
JTrlm
Chitistone and Nizina Limestone units, undivided
Limestone and marble
Trsl
Spiculite and sandy limestone, Late Triassic, Norian (Trs, MD002) [Overprint symbol 708]
Trcs
Calcareous sedimentary rocks, Late Triassic, middle(?) Norian and Late Karnian
Trgl
Glenn Shale, lower unit, Late and Middle Triassic
Trvs
Limestone, chert and some greenstone
Trcg
Conglomerate and volcanic sandstone, Late Triassic, Norian
Trr
Red beds, Late Triassic
Calcareous phosphatic shale and limestone [probably correlative with lower part of Glenn Shale]
Otuk Formation, Triassic
Trss
Shuyak Formation, sedimentary member
Rhyolitic lava and breccia, tuff, chert, and shale, in Kantishna quadrangle, unit eliminated on newer TN003 compilation
Trn
Mafic igneous rocks, Triassic(?)
Tatina River Volcanics, lower members, pillow basalt and gabbro [see 5450, 2890, all thought to be same unit]
Trv
Upper Triassic volcanic rocks
Trvm
Mafic dikes, sills, and plugs intruding Shuyak Formation
Trsv
Shuyak Formation, volcanic member
Trqd
Afognak pluton, U-Pb age indicates is probably Triassic
Trgb
Gabbro, diabase, and metagabbro, Late Triassic(?)
Cumulate mafic and ultramafic rocks, Late Triassic(?) [Nikolai related]
Trc
Carbonatite
Trnm
Schistose metasedimentary and metavolcanic rocks, Late Triassic
Trmg
Biotite-hornblende syenite-monzonite gniess
Nikolai Greenstone, Late and/or Middle Triassic
Nikolai Greenstone - subaerial basalt flows member, Late Triassic
Nikolai Greenstone, Late and/or Middle Triassic, pillow basalt member
Trn?
Basalt, diabase, and subordinate sedimentary rocks, Late Triassic, Karnian and Norian
Trcb
Cottonwood Bay Greenstone
Basaltic metavolcanic rocks, Late Triassic,
Metavolcanic, metavolcaniclastic, and subordinate metasedimentary rocks, Late Triassic, late Norian,
Metabasalt and slate, Late Triassic
MzPzt
Togiak-Tikchik Complex, formerly Gemuk Group, chiefly siltstone and lesser chert and volcanic rocks
Mzi
Intrusive rocks, quartz diorite and diorite
Ktrv
Basaltic rocks
Mzm
Mafic rocks, diorite and gabbro
Mzum
Ultramafic and associated rocks
Ultramafic and mafic igneous rocks along Broxson Gulch thrust
JPzk
Metasedimentary and metavolcanic rocks, (Correlated with Kakhonak Complex)
Metavolcanic and metasedimentary rocks, (Correlated with Kakhonak Complex)
Pzeg
Etivluk Group, undivided:  Maroon, red, green, gray, black, and variegated chert and siliceous argillite, minor maroon calcareous siltstone and argillite, and rare maroon or gray limestone lenses.
TrCs
Sedimentary rocks:  Includes: Shublik and Otuk Formations - Black shale, siltstone, limestone, and black chert; Sadlerochit Group - black shale, and bluff calcareous siltstone; Siksikpuk Formation - black, red, and green shale and siltstone; buff calcare
TrPs
Dark gray, phyllitic, siliceous to carbonaceous argillite and shale, subordinate chert-rich conglomerate, chert, volcaniclastic rocks, highly calcareous argillite or limestone, and minor intrusive rocks.
TrMts
Formerly Rampart Group, sedimentary rocks, now considered Tozitna -- Triassic to Mississippian
TrMis
Rampart Group, sedimentary rocks, Triassic to Mississippian
MzPzc
Chert and argillite, Goodnews terrane
TrPzvs
Volcanic and sedimentary rocks of Talkeetna superterrane, Triassic and Paleozoic [Only in cross-sections]
TrPgt
Lower unit Glenn shale and Tahkandit Limestone, undivided
TrPas
Flysch-like sedimentary rocks
MzPzv
Turbiditic volcaniclastic sandstone and argillite, Goodnews terrane
MzPzs
Arkosic sandstone and slate, Goodnews terrane
Pcs
Marine sandstone, shale, limestone and conglomerate
MzPzm
Melange and argillaceous melange, Goodnews terrane
TrDv
Chulitna Sequence -- volcanic and sedimentary rocks, Early Triassic to late Paleozoic
TrMica
Chert, volcanic rocks, metasandstone, and limestone
Chert, argillite, and volcaniclastic rocks
JPztm
Mafic and ultramafic rocks, undivided (Jurassic? and/or Paleozoic?)
MzPzi
Volcanic rocks, unknown age
JTrtmu
Rampart Group, igneous rocks, Triassic to Mississippian
TrMtsu
Mafic and sedimentary rocks; pillow basalt, chert, and minor argillite
JMtu
Mafic, ultramafic, and sedimentary rocks of the Tozitna sequence, undivided (Jurassic to Mississippian)
JMab
Basalt and diabase, Permian to Jurassic
Jaum
Ultramafic rocks, Permian to Jurassic
Undivided intrusive rocks, Mesozoic or Paleozoic
MzPzg
Granodiorite of Rainbow Mountain
Diorite
Gabbro and quartz diorite, Mesozoic and/or Paleozoic
MzZum
Undivided dunite and serpentinite, Mesozoic or Paleozoic
MzPzu
Metamorphic rocks, undivided
Fine- to medium-grained mylonitic metasedimentary rocks, calc-schist, marble, quartz-mica schist
Schist and amphibolite, Late Cretaceous or older
Mzpca
Quartz-mica schist, calc-schist, and amphibolite, Late Jurassic or older
Schist, quartzite, and amphibolite, Triassic(?) [See also MH002 units mig and mgsh.  Lithologically similar rocks on strike in Healy quad have Penn to Trias conodonts, see unit Trcs?] {Mzmm}
TPza
Raven Creek Hill unit, metasedimentary gneiss, mica schist, phyllite..., Mesozoic or Paleozoic
Argillite and metagraywacke, Late Jurassic or older
MzPzaq
Argillite and quartzite.  Deleted unit in revision.
Phyllite, Late Jurassic or older  [see Pzp, #5540]
KJvr?
Phyllite, amphibolite, greenstone, and diorite, Mesozoic or Paleozoic Lumped with Vrain
MzPzp
Chloritic phyllite, Goodnews terrane
JPk
Kakhonak Complex (Jurassic, Triassic and older?)
Metachert and phyllitic quartzite, Goodnews terrane
JPe
Banded dark-green, gray, and red eclogite and banded amphibolite.
MzPzb
Metabasalt and minor metachert
JPaur
Uranatina Metaplutonic Complex, Jurassic(?), Layered quartz gabbro; Amphibolite and orthogneiss
MzPmi
Metamorphosed igneous rocks, post-Carboniferous
MzPzq
Schist of lower grade metavolcanic and metasedimentary rocks unit
MzPzo
Ophiolitic metamorphosed mafic rocks
Pzrmi
Metamorphosed mafic igneous rocks
Serpentinite, Mesozoic and/or Paleozoic
Pzds
Dolostone, black shale and carbonate rocks
DCd
Dillinger stratigraphic sequence, undivided; sedimentary rocks of Dillinger River, lime mudstone and shale, etc, Paleozoic
Pzld
Massively bedded limestone, dolomite, and schist, Paleozoic, Seward terrane
PzZls
Undivided limestone and schist, Paleozoic
Pzls2
Limestone and quartz-mica schist, Paleozoic, Seward terrane
Pzlc
Limestone and chert
Pzrm
Carbonates, early Paleozoic
PPl
Limestone?, Permian-Pennsylvanian?
Pzqa
Quartzite and argillite, Late Paleozoic
Pzca
Chert and argillite, Late Paleozoic
Pzsu
Clastic rocks, undivided, Paleozoic(?)
JCmd
Mystic and Dillinger stratigraphic sequences, undivided (Triassic to Ordovician), undivided sedimentary rocks, typically flysoid
JDm
Mystic stratigraphic sequence, undivided (Triassic to Devonian)
Pzvs
Volcanic and sedimentary rocks, middle or late Paleozoic
Pillow basalt, middle or late Paleozoic [see 2890, 4215, all thought to be same unit]
Pagb
Gabbro and leucogabbro, Late Paleozoic, Permian to Pennsylvanian
Pzug
Ultramafic and mafic rocks and greenstone
Pze
Eclogite see Chatanika unit [5510], which includes eclogite in Livengood quad
Pzkm
Undivided Paleozoic metamorphic rocks:  quartzite, semischist, and amphibolite
Chatanika unit, allochthonous garnet-bearing qtz-bio-mus schist and quartzite, Paleozoic
Dm
Marble, Paleozoic
TrMtqp
Calcareous siltstone and sandstone and phyllite
PMpc
Phyllite, calcareous phyllite, and marble
JPam
Meta-hornblende andesite, Late Paleozoic(?); Amphibolite and quartz diorite, Middle to Early Jurassic metamorphic age
PDms
Greenish-gray siliceous slate, quartzite, chert, and greenstone, Perm-Miss.
MDtm
Cataclastic rocks, Totatlanika Schist
Metamorphic and sedimentary rocks, black and greenish-gray siliceous slate, chert siltstone, debris flows, greenstone, Permian to Devonian(?)
Pat
Slana Spur Formation, marine calcareous and noncalcareous volcaniclastic rocks, Early Permian-Middle Penn.
Slana Spur Formation, calcareous volcaniclastic rocks, Early Permian-Middle Penn.
PPast
Metamorphosed Skolai Group
Pzv
Slana Spur Formation, volcaniclastic rocks, Early Permian-Middle Penn. [equivalent to part of Station Creek Fm.]
Pzvc
Volcanic rocks, volcanic sandstone, cherty argillite, quartzite, and tuff
JPzsgs
Greenstone
Pzk
Keevy Peak Formation, schist, quartzite, and phyllite, early Paleozoic
Pzk?
Pzkcp
Calcareous and phyllitic rocks
Pzsc
Spruce Creek sequence of Kantishna Hills from Bundtzen thesis
PzZyg
Big Delta Gneiss dome
Metamorphic complex of Gulkana River, amphibolite
Psu
Sedimentary rocks, undivided, Permian.  Sandstone, siltstone, and quartzite
Pls
Unnamed Permian limestone
Ptl
Tahkandit Limestone, massive bioclastic limestone
Ps
Argillite, sandstone, sandy limestone, and minor conglomerate
Graywacke, conglomerate, and mudstone, Permian(?)
Ph
Hasen Creek Formation
Phls
Limestone of the Hasen Creek Formation
Pv
Permian(?) volcanic rocks (agglomerate) from Hanson (1957)
Greenstone and chert
Pmi
Shallow-level stocks, dikes, sills and small plutons, Early Permian?
Pmgi
Monzonitic-granitic complex
PPad
Diorite complex, diorite, granodiorite, and altered diabase and gabbronorite
Strelna Metamorphic complex, low- to medium-grade greenschist and amphibolite, Late Jurassic or older
Pmg
Mankomen Group, undivided [equivalent stratigraphically to Skolai Group]
Pe
Eagle Creek Formation, Early Permian, marine argillite and limestone, lower greenschist facies [equivalent to Hasen Creek Fm.]
JPzmb
Skolai Group, marble, Early Permian to Middle Pennsylvanian
Pq
Quartzite, phyllite, micaceous quartzite, marble, inferred Permian age
JPsu
Serpentinized ultramafic
PDl
Pennsylvanian, Mississippian, Devonian, light gray limestone
PDsc
Sheep Creek Formation and correlative largely siliciclastic units of the Mystic stratigraphic sequence (Permian to Devonian); Conglomerate of Mount Dall, Middle Pennsylvanian
PaDcb
Calico Bluff and Ford Creek Formations, undivided
Chert and limestone, chiefly chert, Penn and Miss
PPagi
Granitic plutons south of Denali Fault
Station Creek Formation andesitic volcanic rocks (correlated with Tetelna volcanics), Early Permian? and Pennsylvanian
PMc
Lisburne Group, Kuna Formation, also includes black carbonaceous metachert, quartzite, and siliceous or calcareous phyllite, commonly distinctive silvery blue (phosphatic) bloom on weathered surfaces
Tetelna Volcanics, volcanic flows, etc., lower greenschist facies
Pzi
Metamorphosed intermediate igneous rocks
MDe
Endicott Group, undivided.  Unit includes the Hunt Fork Shale, Noatak Sandstone, Kanayut Conglomerate, Kekiktuk Conglomerate, and Kayak Shale.
MDl
Lisburne Group, Kogruk Formation (uppermost?) Fossiliferous limestone, Miss.
Mlg
Lisburne Group, undivided
Mk
Endicott Group, Kayak Shale
PMl
Younger limestones of Mystic stratigraphic sequence (Mississippian)
Mke
Endicott Group, Kekiktuk conglomerate (Mke, AR002; DP004; ML002; Mke, Mke?, SP002) [Overprint symbol 14]
Mkk
Endicott Group, Kayak Shale and Kekiktuk Conglomerate
Mkkc
Endicott Group, Kekiktuk or Kanayut Conglomerate
Lisburne Group, Utukok Formation - Limestone, Mississippian to Devonian
Mc
Chert, Mississippian
MDfl
Ford Lake Shale, laminated siliceous shale and chert
Mlt
Limestone and tuff
MDv
Massive and pillowed basalt and other volcanic rocks
MDt
Totatlanika Schist, metavolcanic and metavolcaniclastic rocks, Early Mississippian to Middle Devonian,
MDt?
Totatlanika Schist?, metavolcanic and metavolcaniclastic rocks, Early Mississippian to Middle Devonian,
MDyao
Augen gneiss and schist, Mississipian or Devonian intrusion age, Yukon-Tanana terrane
MDrao
Augen gneiss and schist, Mississipian or Devonian intrusion age, Ruby terrane
Mgq
Globe quartzite unit  Similar to Keno Hill Quartzite in Yukon
Dnu
Endicott Group, Noatak Sandstone and phyllite, carbonate and clastic rocks of the Nakolik River, shale,
Dp
Phyllite, slate, silicious siltstone, and argillite
Ruby marble [Dubious age call?, reported in source as Paleozoic?]
Dtr
Troublesome unit, rhythmically interbedded cherty argillite to chert and thin beds of slate, Devonian(?), also McCann Hill Chert
Dsc
Shale and chert of Mystic stratigraphic sequence (Devonian)
Dmo
McCann Hill chert and Olgilvie Formation, undivided
DOmr
McCann Hill Chert and Road River Formation, undivided
MDkn
Endicott Group, Kanayut conglomerate and Noatak sandstone
Dky
Endicott Group, Kanayut Conglomerate
Dkyq
Endicott Group, Kanayut Conglomerate - Quartz arenite and quartz wacke member
MDkh
Interlayered dark gray to black phyllite and calcareous phyllite.  Unit is more siliceous than either Early Mississippian Kayak Shale or Late Devonian Hunt Fork Shale although it is lithologically similar to both.  At present, these rocks are considered
Dnr
Quail unit, conglomerate, phyllite, calc-phyllite, siltstone, and sandstone, Late Devonian(?), also Nation River Formation of Charley River quad.
Dnr?
Calcareous clastic rocks; also Devonian sandstone and shale
Dnr2?
Quartz wacke
Dhf
Endicott Group, Hunt Fork Shale
DSl
Limestone, Late Devonian
DSml
Carbonate rocks of the lower part of the Mystic stratigraphic sequence (Devonian and Silurian)
Dg
Dark-greenish-gray fine-grained impure graywacke
Dcs
Chloritic siltstone and conglomerate (Dc, AR002; Dqq, CH002) [Overprint symbol 13]
Dcb
Cascaden Ridge, Beaver Bend combined correlative units, shale, siltstone, sandstone, conglomerate, and minor limestone, Middle Devonian
Limestone (Late Devonian to mid-Silurian)
Ds
Schwatka unit -- Limestone and Ogilvie Formation of Clough (1980), Middle and Early Dev.
DSbs
Baird Group, Skajit Limestone
DSca
Barren Ridge limestone, calcarenite, calcareous siltstone, and limestone
Dlc
Lost Creek unit, lime mudstone and wackestone, Devonian and Silurian
DSls?
Limestone, dolomite, greenstone, and chert
DSls
Laminated limestone, sandstone, and siltstone
DSwc
Whirlwind Creek Formation and unnamed correlative units (Late Devonian, Frasnian through mid-Silurian, Wenlockian), reefy limestone and dolomite
DSt
Tolovana Limestone, Middle Devonian to Early(?) Silurian,
DSt?
Limestone, greenstone, and schist
DCru
Road River Formation, Hillard Limestone and other units, undivided
Dvt
Basaltic and andesitic flows, tuff, breccia, and volcanic conglomerate altered to greenstone, interbedded in Hunt Fork Shale
Dsv
Schwatka unit, mafic volcanic rocks, Middle and Early Devonian
Dwv
Woodchopper Volcanics, amygdaloidal basalt, pillow basalt, ..., equivalent to Schwatka unit?
Ddg
Diorite-gabbro
Dms
Metamorphic rocks, undivided.  Includes carbonate rocks; quartzite and slate.
DZnl
Nanook Limestone, Thin- to thick-bedded limestone, silicified limestone, and vuggy dolomite with minor amounts of siltstone and shale.  Includes Mount Copleston Limestone which is now Devonian part of unit, Nanook now considered Ordovician and older.
Dkg
Kaskawulsh Group of Kindle, mainly marble
Dpmc
Phyllite and metaconglomerate
Dbs
Thin bedded black, siliceous, carbonaceous phyllite and impure chert
Dyv
Fine-grained schistose volcanic rocks and phyllite, Devonian extrusion age,
Dy
Yanert Fork sequence, thick sequence of marine metasedimentary and metavolcanic rocks, Late Devonian
Dbl
Brooks Range sequence -- Limestone
Medium-grained granitic gneiss, Devonian intrusion age
Metasedimentary rocks, Late Devonian
Metabasalt and subordinate metasedimentary rocks, Late Devonian
Dmgs
Serpentinite, basalt, chert and gabbro, Late Devonian
Dmgb
Metagabbro, Late Devonian(?)
Pzsb
Light-brown weathering calcareous schist interbedded with gray quartz-mica schist and marble.  Brooks Range schist belt.
DPzmp
Pelitic, calcareous, and quartz-feldspar metasedimentary rocks, Devonian or older,
Dys
Fine-grained, schistose metasedimentary and metavolcanic rocks, Devonian or older, [Evidence suggests that this unit is most likely Triassic, at least in its western exposures and correlates with similar units all along the north side of the Denali, unit
Davf
Very light gray to brownish red weathering resistant schistose felsic volcanic rocks, Ambler sequence?
DOtu
Metasedimentary and metavolcanic rocks of Tukpahlearik Creek, undivided
DOtq
Carbonaceous quartzite and quartz conglomerate of Tukpahlearik Creek
DOtmq
Marble and quartz schist of Tukpuhlearik Creek
DOtpg
Pelitic schist and greenstone of Tukpaklearik Creek
DSmdl
Thin-bedded limestone
Sab
Heceta Limestone, reefoid limestone
Spf
Paradise Fork Formation and correlative units
Sml
Middle Silurian limestone
Sta
Point Augusta Formation argillite and chert
Ss
Micaceous calc-sandstone
Stc
Terra Cotta Mountains sandstone, sandstone and graptolitic shale
SZa
Amy Creek unit, siliceous dolomite, chert, and basaltic greenstone, minor limestone, shale..., Silurian(?) to Late Proterozoic
SZa?
Dolomite and argillite
SCb
Black siltstone and phyllite
OCc
Carbonate rocks
Olss
Tcherskidium-bearing limestone
Os
Brown and gray 'chippy' shale, silty shale and silicified limestone
Ont
Novi Mountain and Telsitna Formations, and unnamed correlative units, massive dolomite and limestone, Late to Middle Ordovician
OCjr
Jones Ridge Limestone, massive oolitic, typically silicified limestone
OChl
Hillard Limestone
SOdl
Limestone and dolomitic limestone
Od
Nome Complex, pink to light gray weathering, gray to tan fine-grained dolostone with distinct color mottling
Oshd
Limestone and shale
Oimh
Nome Complex, impure marble, biotite grade (Oimh, BN002; SO002)
Oab
Algal boundstone and lime mudstone
Ols
Lime mudstone
SCpl
Post River Sandstone and Lyman Hills Formations and correlative units, silty limestone and siltstone, Early Ordovician
Ofc
Fossil Creek Volcanics, undivided -- Alkali basalt, agglomerate, and volcaniclastic conglomerate
OCv
Andesitic to basaltic volcaniclastic rocks and local tuffaceous phyllite, gabbro, and diabase, and black phyllite
OCx
Interlayered pure and impure marble, quartz-graphite schist, and lesser pelite, calc-schist, and mafic schist
OCxh
Predominantly marble and quartz-graphite schist above biotite grade; upgraded equivalent of mixed unit [OCx]
Och
Ordovician chert, including Livengood Dome Chert, chert, siliceous slate and rare greenstone and limestone, Late Ordovician (protolith)
Oldl
Limestone marker bed within Livengood Dome Chert
Ocs
Casadepaga schist
Ocsh
Calcareous and mafic schist
Oim
Nome Complex, impure marble (Oim, BN002; BN004; KZ003; NM005; SO002; SO004; SO005; TE004; Pzim, BN002; SO002)
Ca
Adams Argillite
Cqa
Quartzite and argillite
Cf
Funnel Creek Limestone
CZtu
Tindir Group, upper part, Early Cambrian and Late Proterzoic argillite, quartzite, dolomite, dolo-arenite...
CZwl
Wickersham unit -- Limestone, Early Cambrian and Late Proterozoic
CZum
Ultramafic and mafic rocks and greenstone, Cambrian and/or preCambrian
CZw
Wickersham unit -- Grit, Early Cambrian and Late Proterozoic
CZwa
Wickersham unit -- Maroon and green argillite, Early Cambrian and Late Proterozoic (unit CZwa, LG002; ng, FB002; Cal, TN002; western exposures of unit PzpCa in part, CI002)
DZn
Undivided shallow marine carbonate units of Holitna Basin area, late Proterozoic to Devonian
CZds
Oolitic limestone, Khuchaynik Dolomite of Babcock and others, Big River Dolostone of Babcock and others, Windy Fork Formation of Babcock and others
Zwg
Grit, Late Proterozoic, bimodal quartzite, gray and olive-gray greenschist facies argillite
ls
Various limestone bodies
Mafic igneous rocks, Paleozoic and/or Late Proterozoic
PzZrqm
Ruby quartz-mica schist
PzZaqs
Quartz-mica schist.  Assigned to Arctic Alaska terrane
PzZk
Mixed schists of the Kallarichuk Hills, undivided.  Schist belt.  Assigned to Seward terrane
YZnc
Calc-schist and impure marble, early Paleozoic or preCambrian
Pzydm
Dolomite and marble
Pzrmc
Metamorphic complex, crystalline limestone, Paleozoic (Ord-Dev) or preCambrian
PzZm
Metamorphic complex, schist, crystalline limestone, quartzite, greenstone, slate, and phyllite
PzZysa
Pelitic schist, early Paleozoic or preCambrian, includes Chena River sequence
PzZpg
Sillimanite gneiss subunit, pelitic schist
PzZiqs
Pelitic and quartzose schist sequence
YZns
Pelitic schist of Nixon Fork basement
PzZmc
Metamorphic complex, schist and quartzite with some crystalline limestone, younger unit, Paleozoic (Ord-Dev) or preCambrian
PzZms
Mafic schist
YZnv
Felsic metavolcanic rocks of Nixon Fork basement
Ynqd
Meta-quartz diorite
PzZrpg
Gneiss and quartzite of the Ruby crystalline complex, Paleozoic or preCambrian
PzZypg
Gneiss, schist, and quartzite of the Yukon-Tanana crystalline complex; Pelly Gneiss in Yukon in part
Ytl
Tindir Group, lower part, stromatolitic limestone
Yts
Tindir Group, dolomitic sandstone and shale member
Ytb
Tindir Group, basalt and red beds member
Ytb?
Zgr
Granitic rocks, preCambrian(?)
PzZma
Metasedimentary and metavolcanic rocks of Mount Angayukaqsraq
PzZyqs
Greenschist facies muscovite chlorite schist, quartzite and phyllite [Fairbanks schist unit - undivided]
Fairbanks schist unit - Cleary subunit, white felsic schist, micaceous quartzite chloritic or actinolitic greenschist, greenstone and marble
Pelitic and quartzose schist of the Alaska Range
Quartzite subunit of quartzite and quartzitic schist
Calc-silicate and marble subunit of quartzite and quartzitic schist
PzZrqs
Pelitic and quartzitic schist of the Ruby terrane
Greenschist subunit of quartzite and quartzitic schist  [Not found yet on map.]
Quartzitic and pelitic schist of the Yukon-Tanana crystalline complex
Xi
Idono Complex, Early Proterozoic, metaplutonic rocks, amphibolite, and minor metasedimentary rocks
Xo
Amphibolite facies orthogniess and minor amphibolite and pelitic schist.  Kanektok or Kilbuck terrane
pCg
Includes coarse-grained gabbro, diabase and altered equivalents which locally are garnet-glaucophane rocks.  Of two ages
pCsg
Slate of the York region, slightly to moderately metamorphosed graphitic siltite, slate, graywacke, and calcareous siltite
pCn
Nome Complex undifferentiated; chloritic schists and marble schists
pCne
Nome Complex, chlorite-epidote-amphibole schists, intensely deformed, locally graphitic; retograded blueschist facies rocks locally; subordinate schistose limestone
pCnl
Nome Complex, dark schistose limestone intercalated with subordinate chloritic schist
pCmu
Kigluaik Group, undifferentiated
pCm
Coarse-grained marble, locally contains mica and either olivine or monticellite
pCb
Tigaraha Schist, biotite-garnet schist
pCbm
Marble and calc-silicate rocks intercalated in Tigaraha Schist
pCgn
Orthogneiss
pCgu
Biotite-hornblende-quartz-plagioclase paragneiss
pCgl
Quartz-biotite-plagioclase-hornblende paragneiss and local calc-silicate rock
Hornfelsed zones.
Psc
Step Conglomerate, Permian, chert and quartzite clast pebble- and cobble conglomerate
DOtp
Pelitic schists of Tukpaklearik Creek
Dbc
Beaucoup Formation,
Silicified tuff, white, light-tan, light-gray silica rock
Kkt
Kandik Group; Kathul Graywacke
Kkd
Kandik Group equivalent, Mount Goodenough in Yukon?
Zt
Pinguicula/Fifteen Mile (Lower) and Tindir Group, lower part
JTrgb
Gabbro, associated basalt and andesite(?), minor diorite and diabase, and undiffereniated mafic- and intermediate composition igneous rocks.
Pks
Klondike Schist, poorly understood assemblage of metamorphosed pelitic/volcanic rocks and minor marble.
Pksm
Klondike Schist, marble.
Kvgb
Laminated tuff, Valdez Group (Kvt, AN002; SR004; BS004)
Tak
Amphithreatre and Kulthieth, mostly fluvial and lacustrine deposits, local debris-flow deposits; some shallow marine
Jb
Bug Creek, undivided.  Several cycles of shale and shelf sandstone in northern Yukon, fining generally to the northwest, and including equivalent generally fine clastic strata in central Yukon.
Bug Creek Group, succession of alternating coarse and fine clastic formations
Jbs
Bug Creek Group, Lower Schist: dark grey argillite, slate, and phyllite, commonly graphitic, thin-bedded dark grey quartzite, platy to phyllitic quartzite; minor phyllite and limy quartzite
Jl
Laberge Group, arkosic sandstone and minor shale with resistant heterolithic pebble and boulder conglomerate; recessive, thin bedded, silty shale
Ksf
South Fork Volcanics, locally columnar jointed, massive, densely welded, biotite-quartz-hornblende-feldspar crystal tuff
Jnd
Nordenskiold Dacite
Trsc
Synorogenic clastic rocks
Trsg
Stikine Suite, Tally Ho Leucogabbro, Little River Batholith, Friday Creek diorite.  Coarse-grained, foliated, gabbroic hornblende orthogneiss; hornblende-biotite granite and granodiorite; foliated, fine- to medium-grained hornblende quartz diorite to dio
Trg
Galena Suite, massive, medium-grained hornblende diorite and gabbro sills; serpentinized greenstone sills
KPzw
Windy, quartz-chlorite-sericite schist, epidote-actinolite greenschist, quartzite, slate, quartz-mica schist, limestone
KJse
Saint Elias Suite, biotite hornblende granodiorite; lesser tonalite; locally quartz monzodiorite, quartz diorite, granite, and quartz monzonite
Pf
Fantasque, grey to black chert in medium to very thick beds separated by thin beds of shale; grey sandstone and mudstone
Mpm
Pelly Mountains Suite, massive, medium to fine grained equigranular syenite; gradational to trachyte; intrusive equivalent to felsic volcanics of the Earn assemblage
Dgr
Old Crow Suite, undivided
Old Crow Suite granitic rocks:  medium to coarsely crystalline leucocratic biotite granite, Old Crow, Schaeffer, Sedgwick, Ammerman, and Fitton granites
Dsr
Old Crow Suite granitic rocks:  leucocratic syenite to hornblende nepheline syenite, Dave Lord syenodiorite
CZhy
Hyland Group, consists upwards of coarse turbiditic clastics, limestone, and fine clastics typified by maroon and green shale; includes scattered mafic volcanic rocks
Cad
Avalanche, light grey, buff, yellow, and orange weathering, crypto grained dolomite, silty dolomite, dolomitic siltstone and dolomitic mudstone
CZnp
Neruokpuk, turbiditic sandstone, quartzite, grit, and pebble conglomerate interbedded with siltstone and lesser argillite
CZng
Neruokpuk, fine to coarse sandstone, grit and pebble conglomerate, poorly sorted, turbiditic, locally feldspathic; siltstone and slaty argillite interbeds; local maroon, green and Oldhamia bearing slate in upper part
Ch
Hess River, shale, black, pyritic, unfossiliferous; occurs as interstratified thick units of black calcareous shale and rusty black shale
Cr
Rockslide, platy calcareous shale and silty, dark grey fine- to crypto-grained limestone; minor thin beds of light brown to grey weathering platy dark crypto-grained limestone and rare bands of buff dolomite
Yw
Wernicke Breccias:  Hematitic and dolomitic breccia and related metasomatized country rock; breccia contains variably altered rotated siliceous and carbonate clasts (Wernicke Supergroup) and minor dyke rock; breccia and metasomatites enriched in Cu, Co,
lPkd
Gillespie Lake Gp.:  Dolostone and silty dolostone, locally stromatolitic, locally with chert nodules and sparry karst infillings, interbedded with lesser black siltstone and shale, laminated mudstone, and quartzose sandstone; local dolomite boulder cong
lPq
Quartet Gp.:  Black weathering shale, finely laminated dark grey weathering siltstone, and thin to thickly interbedded planar to cross laminated light grey weathering siltstone and fine grained sandstone; minor interbeds of orange weathering dolostone in
lPfl
Fairchild Lake Gp.:  Lower:  greenish grey weathering calcareous laminated siltstone, grey weathering fine grained sandstone, and minor brown weathering carbonate, ripple cross-laminated; upper:  siltstone, dolomitic siltstone, and dolostone
Yhr
Hart River, undivided Mafic volcanic flows and and their possible intrusive equivalents
Yhv
Hart River Volcanics:  mafic volcanic flows, generally massive and fine-grained, locally pillowed
Yhs
Hart River Sills:  resistant dark weathering diorite and gabbro sills and dikes
Ykc
Khose Creek Volcanics:  basic to intermediate volcanic flows and aquagene tuffs
Qvs
Bedded volcanic sediments
Qtf
Tidal flat and estuarine deposits, offshore, subject to inundation
Toss
Orca Group:  Dark-gray to black siltstone, mudstone, and minor fine-grained sandstone
Top
Orca Group:  Pillow basalt
Kvg
Valdez Group -- Schistose metaflysch
Kvsg
Valdez Group -- Schistose to gneissic metaflysch and migmatite
MzPzr
Reindeer Hills complex of altered carbonate rocks, schist and quartzite, and shallow intrusive rocks
uKss
Volcanic provenance sandstone, siltstone, and shale, Kuskokwim Group
Metabasite, Arctic Alaska terrane
Kmg
Granite 85-110 Ma
Kmqm
Quartz monzonite, monzonite, and syenite 85-110 Ma
Kmqd
Intermediate granitic rocks, mostly quartz diorite and tonalite, magmatic garnet and epidote 85-110 Ma
Qw0
Till, Brooks Lake, Kvichak  [Ground moraine assigned Qclass of 1395]
Kgcg
Calcareous graywacke and conglomerate
Ty
Yakataga Formation
Trf
Redwood Formation
Tpc
Poul Creek Formation sedimentary and volcanic rocks, undivided (
Ttf
Tokun Formation
Tslo
Siltstone of Oily Lake
Tou
Orca Group ultramafic rocks
Kvvs
Valdez Group, Interbedded volcanic and sedimentary rocks
Tswf
Stillwater Formation(?)
Mzpg
Phyllite/greenstone melange; occurs structurally between the McHugh Complex and Valdez Group
Qewd
Drumlins associated with early glaciations
Qmhg
Early Wisconsin ground moraine
Tmd
Mafic dikes, sills, and plugs
KTrs
Marine volcaniclastic sandstone, conglomerate, and argillite
Jkw
Graywacke of Kulukak Bay (Weary Graywacke)
Trlc
Triassic limestone, shale, and chert
PzZi
Meta-intrusive rocks of intermediate composition
PzZss
Siliceous schist of the Kallarichuk Hills.  Assigned to Seward terrane
Pzp
Phyllite of Arctic Alaska terrane
Pzg
Metagraywacke of Arctic Alaska and Ruby terrane
fg
Rocks within major fault zones; may be cataclastic or mylonitic, variable ages depending on fault and country rocks
MzPztl
Lava flows in undivided Gemuk Group, chiefly siltstone and lesser chert and volcanic rocks
TrPls
Limestone in undivided Gemuk Group, chiefly siltstone and lesser chert and volcanic rocks
MzPztv
Volcanic breccia in undivided Gemuk Group, chiefly siltstone and lesser chert and volcanic rocks
Oc
Chert and phyllite, Telida sub-terrane of Munchumina terrane
MzPzl
Melange between Angayucham-Tozitna and Arctic Alaska and Ruby terranes
Klvm
Qbd
Basalt dome
QTob
Olivine basalt flows
TMzu
Basement rocks - undifferentiated
TMzc
Basement rocks - conglomerate, argillite, siltstone, and chert.
QTk
Kiska Harbor Formation
QTkb
Kiska Harbor Formation, breccia member
QTkf
Kiska Harbor Formation, flow member
Tka
Krugoli Formation, tuff and tuff-agglomerate.
QTvb
Pochnoi Volcanics - Tuff-breccia, lava flows, and agglomerate, largely basaltic
QTd
Qvda
Dacite and rhyodacite
Qva
Andesite and low-silica dacite
Qvr
Rhyolite
Tlp
Lavas and pyroclastic deposits, most likely Miocene or younger Tertiary
QTr
Togp
Granite and quartz monzonite porphyry
TKtp
Trondhjemitic pegmatite
Ultramafic rocks, especially including zoned ultramafic bodies of southeast Alaska
Tmog
Biotite quartz monzonite
Kqm
Foliated quartz monzonite and granodiorite
KJgc
Polymictic metaconglomerate, Gravina related
Kft
Shoshonitic flows and tuffs (Kft, UL002) [Overprint symbol 13]
KJmqd
Metamorphosed quartz diorite, granodiorite, and diorite
TrPzms
Alava sequence, undivided Permian and Triassic
Stikine, recrystallized volcanic and sedimentary rocks
MzZog
Metamorphosed granitic plutonic rocks (orthogneiss)
Pm
Marble
St
SOm
Marble and subordinate metavolcanic and metasediemntary phyllite and schist
SOsv
Metamorphosed extrusive, intrusive, and sedimentary rocks, undivided
SOmi
Metamorphosed intermediate and mafic plutonic rocks
Tegd
Coast Plutonic Complex
Tgdp
Porphyritic granodiorite distinctive phase of Coast Plutonic Complex
TKtf
Foliated tonalite sill of Coast Plutonic Complex
Jmgd
Texas Creek granodiorite (metamorphosed)
Pzsqm
Metamorphosed sedimentary, volcanic, and intrusive rocks, undivided
MzPzmi
Mainly regionally metamorphosed or otherwise recrystallized or altered diorite, quartz diorite, and gabbro
TrPv
Alava sequence, metavolcanic rocks, derived primarily from submarine andesitic or basaltic lava flows, tuff, and agglomerate
Pza
Metavolcanic rocks of early Paleozoic age, derived primarily from submarine andesitic or basaltic lava flows, tuff, and agglomerate
PzZbg
Paragneiss characterized by rusty brown weathering pelitic paragneiss and schist
Pzm
Trmv
Mafic metavolcanic rocks, metamorphosed intermediate to mafic volcanic flows, pillowed flows, tuff, and agglomerate, with subordinate pelitic and semipelitic flysch. (Alava)
Dgv
Gambier Bay Formation, sedimentary and volcanic rocks, marble and recrystallized limestone, phyllite and semischist, and tuffaceous marlstone, pillow breccia, volcanic conglomerate, aquagene tuff, subordinate basaltic to andesitic pillow flows
Trhv
Hyd Group, including Chapin Peak Formation marine volcanic rocks and subordinate calcareous sedimentary rocks
Trhb
Hyd Group breccia
Trhl
Hyd Group limestone and dolomite
Trhf
Hyd Group felsic volcanic rocks, includes Puppets Formation on Gravina Island
Trhg
Hyd Group, undivided
Twd
Wrangell Lava, dome and hypabyssal rocks
Twl
Wrangell Lava, Pliocene to Oligoocene lower part, undivided
Twr
Wrangell Lava, rhyolitic rocks, undivided
Twor
Wrangell Lava, obsidian-bearing rhyolite flow
Tmgr
Granite and granitic rocks
Kmgb
Gabbro (not zoned ultramafic)
Tvc
Chiefly block and ash deposits, mafic to felsic tuff, tuff breccia, lapilli tuff, and unclassified pyroclastic deposits
Tkz
Kootznahoo Formation, light greenish gray, medium- to coarse-grained, friable, lithofeldspathic fluvial sandstone and siltstone containing leaf fragments and rare, cm-scale, coal lenses
Tmrf
Tcpm
Leucocratic granodioritic migmatite of the Coast Plutonic Complex
TKtm
Tonalite migmatite of the tonalite sill of the Coast Plutonic Complex
Tcpm2
Another Coast Plutonic Complex migmatite
Trha
Hyd Group argillite
Trclt
Perseverance Slate and related Alava slate and phyllite
Pp
Pybus Formation, limestone and dolostone
Stpc
Polymictic conglomerate and olistostrome deposits associated with Silurian turbibidites and reefs
Kmgd
Intermediate granitic rocks, mostly granodiorite (Kwqo, PE002; Kwqo, Kwan, PE003) [Overprint symbol 16]
Phl
Halleck Formation calcareous siltstone to conglomerate
Pal
Crinoidal limestone
PPasy
PDcvs
Cannery Formation, metasedimentary and metavolcanic rocks, undivided
Pak
Klawock Formation, clastic
Stg
Silurian turbidite deposits including the Bay of Pillars Formation, Point Augusta and Tidal Formation and related units
SOt
Descon Formation graywacke turbidites
SOl
Descon Formation limestone
Sv
Silurian volcanic rocks
TrPsa
Alava sequence, metasedimentary rocks
SOgs
Greenstone and greenschist, possible Descon association
PzZbc
Polymictic conglomerate in a schistose matrix
PzZhg
Metavolcanic hornblende schist and gniess
PzZmb
Marble and interbedded schist
PzZas
Metamorphic rocks, Alexander terrane
Toed
Oligocene and Eocene diorite
Tbep
Mafic basalt, layered tuff, tuff breccia and breccia
JTrdi
Tradi
Quartz diorite and lesser granodiorite and diorite, Alexander
Trgn
Orthogniess
Argillite and limestone
Mls
Iyoukeen and Peratrovich Formations, limestone, black chert, and black shale
Dkf
Karheen Formation and related rocks, conglomerate, Lower Devonian
Drl
Cedar Cove Formation
Dfb
Freshwater Bay Formation and Kasaan Island Volcanics, Basalt and rhyolite with subordinate sedimentary rocks, Middle to Late Devonian
Stl
Point Augusta Formation limestone horizon within turbidite deposits
Kegb
Gabbro of Tenakee Inlet on Chichagof Island
Tvig
Intermediate to felsic biotite tuff
KJkr
Koksetna River sequence, Jura-Cretaceous flysch, southern part of Kahiltna terrane
Tvrd
Rhyolitic to dacitic volcanic rocks
Migmatite associated with western plutonic belt of southeast Alaska (Wales-Chichagof arc)
Dtl
Late Devonian thin-bedded limestone
DSr
Rendu Formation and related units, argillite and silty limestone turbidite
Dv
Basalt and rhyolite on Prince of Wales and Kasaan Islands and andesite associated with Black Cap Limestone
Pstl
Tahkandit Limestone, massive bioclastic limestone and Step Conglomerate, Permian, chert and quartzite clast pebble- and cobble conglomerate, undivided
Kus
Unnamed sandstone along Nation River, stratigraphically below Keenan Quartzite
KJyg
Yakutat Group, undivided
KJys
Yakutat Group, flysch facies
KJyx
Yakutat Group, melange facies
KJyxs
Yakutat Group, melange facies, sandstone masses
KJyxc
Yakutat Group, melange facies, conglomerate masses
KJyxg
Yakutat Group, melange facies, greenstone masses
KJyxd
Yakutat Group, melange facies, tonalite masses
KJyb
Metamorphic rocks of the Brabazon Range (Yakutat Group equivalent)
Kynf
Schist of Nunatak Fiord
Teqd
Qms
Mineral spring and mud volcano deposits
MDcp
Carbonaceous phyllite
Pzmv
Metamorphosed volcanic rocks, Kah Shakes sequence
Pzgm
Portland Peninsula gneiss and marble
Qoa
Older alluvium
Qda
Active dume deposits
Qgl
Glaciolacustrine deposits
Metabasite, Ruby terrane
Metabasite, Seward terrane
MDaao
Augen gneiss and schist, Mississipian or Devonian intrusion age, Arctic Alaska terrane
Phyllite of Ruby terrane
KJvs
Volcanic and sedimentary rocks
Togd
Granodiorite and quartz diorite
KJgm
Undifferentiated greenstone, metapelitic rocks, and metasandstone of the Gravina belt
KJgb
Sedimentary and volcanic rocks of the Gravina belt, undivided
Jpg
Bokan Mountain peralkaline granite and syenite
Trls
Stikine terrane limestone, sandy limestone, and mudstone
Trpp
Pinnacle Peak phyllite and phyllite of Rodman Bay
Trml
Marble of Nakwasina Sound and limestone blocks in Freeburn Assemblage
Thb
Paniau, Waimea Canyon, and Waianae Volcanic Series, tholeiitic basalt, olivine basalt and oceanite
Thgm
Paniau, Waimea Canyon, and Waianae Volcanic Series, small mass of gabbro
Twca
Waimea Canyon Basalt; Makaweli Member ash and tuffaceous soil
Thc
Waimea Canyon Basalt and Waianae Volcanics, cinder, spatter, or littorial cones
Qhcl
Koolau and West Molokai (lower) Volcanic Series, cinder, spatter, and littoral cones - Early Pleistocene
Qhvl
Koolau and West Molokai (lower) Volcanic Series - Early Pleistocene
Qfr
Fringing and fossil carbonate reefs
Qpc
Pit craters and calderas {feature, not really unit}
Viscous domes in young Hawaiian volcanic rocks, Hawi and Laupahoehoe Volcanic Series
Qgm
Small masses of gabbro in young Hawaiian volcanic rocks, Kahuku Volcanic Series
Qhvu
Earlier Wrangell Lavas, West Molokai Volcanic Series (upper), Kanapou Volcanic Series (lower), East Molokai, Lanai, Honolua, Wailuku, Honomanu, Plololu, Hamakua, and Ninole Volcanic Series - Early Pleistocene
Qhcu
West Molokai Volcanic Series (upper) and East Molokai, Lanai, Honolua, Honomanu, Kanapou, Pololu, and Hamakua Volcanic Series cinder, spatter, and littoral cones
Qhvd
East Molokai Volcanic Series (upper), Honolua Volcanic Series viscous domes
Qhgm
West Molokai Volcanic Sereis (lower) and Wailuku, Kula, Kanapou, and Pololu Volcanic Series, gabbro masses
PDcs
Cannery Formation, carbonaceous facies, slate and black phyllite
PDcm
Cannery Formation, massive, light- to medium gray and black argillite and marble
Dpr
Port Refugio Formation
Dkfl
Kassan Limestone, part of Karheen
Du
Southeast Alaska undivided Devonian rocks
Pzcs
Calcareous schist
Sum
Ultramafic rocks, southeast Alaska
Ogd
Granodiorite on Prince of Wales Island
Dsy
Syenite, Chichagof Island, southeast Alaska, Alexander terrane
Dqd
Quartz diorite, Prince of Wales Island, southeast Alaska
DSs
Staney Creek sandstone, limestone and dolostone, shallow water facies rocks
PzZsv
Undivided Wales, Retreat Groups, and Four Winds Mountain metamorphic rocks
PzZq
Wales, Retreat Groups, and Four Winds Mountain metamorphic rocks semischist and black quartzite
PzZc
Wales, Retreat Groups, and Four Winds Mountain metamorphic rocks marble
PzZf
Wales, Retreat Groups, and Four Winds Mountain metamorphic rocks metafelsite
PzZmv
Wales, Retreat Groups, and Four Winds Mountain metamorphosed mafic volcanic rocks
CZog
Kaigani, False Point Retreat, and Bronaugh Islands plutons (orthogneiss)
DSv
Berg Mountain, largely mafic volcanic rocks
MDk
Endicott Group, Kayak Shale and Kanayut Conglomerate
Tav
Admiralty Island volcanics, undivided
Tacr
Admiralty Island and Cenotaph Volcanics, rhyolite
Tavd
Admiralty Island and Cenotaph Volcanics, dacite
Tava
Admiralty Island and Cenotaph Volcanics, andesite
Tavb
Admiralty Island and Cenotaph Volcanics, basalt
Tavc
Admiralty Island and Cenotaph Volcanics, volcaniclastic rocks
Volcaniclastic rocks of Rodman Bay and sedimentary and volcanic rocks of Nakwasina Sound
Mzc
Conglomerate and sandstone, possibly northern shore facies of Nutzotin Mountains sequence
Windy terrane volcanic rocks
Trl
Upper Triassic limestone, might not be Chitistone -- Nizina equivalent
Pels
Limestone of the Eagle Creek Formation
Trsgb
Stikine terrane hornblende diorite and gabbro
Trsum
Stikine terrane hornblende ultramafic rocks
Paleozoic orthogneiss
Dav
Ambler metavolcanic and lesser metasedimentary rocks
Ahtell pluton
Qglf
Glacial outwash derived fans deposited in ephermeral glacial lakes
Qsb
Glaciallly scoured bedrock; may be covered with thin glacially derived deposits
Qbld
Drumlin deposits in ground moraine fields of Brooks Lake glacial deposits
Dmg
Gambier Bay Formation Marble
PzZyv
Metabasite, massive mafic semischist and agmatite in the Coast Mountains
Pzbs
Biotite schist and gneiss, with subordinate felsic to mafic metavolcanic rocks, conglomerate containing quartzite, volcanic rocks, and marble. Includes Port Houghton assemblage in Tracy Arm and Port Houghton areas
PPas
Skolai Group undivided; also Skolai Group, greenstone, Early Permian to Middle Pennsylvanian
Tmpo
Very old outwash deposits
Qmig
Glacial deposits of unnamed Illinoian(?) glaciations, ground moraine
Ko
Okpikruak Formation and may include Fortress Mountain Formation, interbedded wacke and mudstone
TrPask
Siksikpuk Formation, Etivluk Group, chert and shale
PaMn
Nuka Formation
Mks
Endicott Group, Kurupa Sandstone
MzPzct
White-weathering chert or silicified limestone
Tsg
Sagavanirktok Formation
Ksbf
Seabee Formation
Trcgs
Conglomerate and shale, Middle Triassic
Dkft
Karheen Formation turbidite facies rocks
SOgu
Medium-grained biotite syenite and granite
SOdcg
Descon Formation conglomerate
SOdr
Descon Formation - Dacitic to rhyolitic volcanic rocks
SOdv
Descon Formation, andesite and felsite
SOds
Descon Formation fine-grained sedimentary rocks [see also NSA 6820]
SOmd
Fine-grained low-grade metamorphic rocks of the Descon Formation and Wales Group [see also NSA 6693]
SOdvm
Descon Formation, basaltic to andesitic volcanic rocks
OCmi
Metaigneous and minor metasedimentary rocks
TKmd
Mafic dikes
Kto
Torok Formation, Aptian to Cenomanian
Ktfm
Torok and Fortress Mountain Formations, undivided, Aptian to Cenomanian
Knf
Nanushuk Formation, includes former Kukpowruk, Tuktu, Grandstand, Corwin, Chandler, and Ninuluk Formations, now abandoned
Ktu
Tuluvak Formation
Ksb
Schrader Bluff Formation
TKpc
Prince Creek Formation, shelf deposits
Tsn
Sagavanirktok Formation, Nuwok Member
Tsfb
Sagavanirktok Formation, Franklin Bluffs Member
Tswh
Sagavanirktok Formation, White Hills Member
Tss
Sagavanirktok Formation, Sagwon Member
Kfm
Fortress Mountain Formation, interbedded wacke and mudstone
Twh
Wrangell Lavas, shallow plutons, chiefly dacite, diorite, and quartz diorite
Twp
Wrangell Lava, hypabyssal and plutonic rocks
Pasb
Saginaw Bay Formation, unit to be abandoned
Dbcl
Black Cap Limestone and Cedar Cove limestone member
Cmgo
Metamorphic rocks of eastern Prince of Wales Island
Jtkh
Talkeetna Formation, Horn Mountain Tuff member
Jtkp
Talkeetna Formation, Portage Creek Agglomerate member
Jtkm
Talkeetna Formation, Marsh Creek Breccia member
JPc
Christian River and Porcupine River sequences
Tsti
Siltstone of Trinity Islands
Kko
Kongakut Formation, pebble shale and siltstone
QTts
Tilted sedimentary rocks at South Bight, Amchitka Island
TKcm
Marine and nonmarine conglomerate to shale
Trkc
Karen Creek Sandstone
TrPsg
Sadlerochit Group, undivided
Tri
Sadlerochit Group, Ivishak Formation
Pef
Sadlerochit Group, Echooka Formation, undivided [NOTE: may be equivalent to NSA 5710 and 5735]
Mlk
Lisburne Group and Kayak Shale, undivided
JTru
Kingak Shale, Shublik Formation, and Karen Creek Sandstone, undivided
KJsh
Pebble shale and Kingak Shale, undivided
TKcf
Canning Formation, basinal turbidite deposits
Pebble Shale unit
Trsu
Qlv
Natural levee deposits
Qdl
Deltaic deposits, including outwash and alluvial deposits
Tkw
Kenai Group and West Foreland Formation, undivided
TKghs
Ghost Rocks Formation, sandstone-rich unit, undivided
TKgha
Ghost Rocks Formation, argillite-rich unit, undivided
TKghc
Ghost Rocks Formation, coherent
Tgva
Ghost Rocks Formation, andesitic volcanic and hypabyssal rocks
TKgvb
Ghost Rocks Formation, basalitic volcanic and hypabyssal rocks
Togb
Gabbroic rocks
Tgn
Gabbronorite and norite
MzZyu
Undivided schist and gneiss (in SE Alaska)
Trsb
Stuhini Group, pillow basalt, volcanic sandstone and mudstone
Trmss
Stuhini Group, tuffaceous sandstone, volcanic wacke, tuff, mudstone, and minor conglomerate
Trkg
Kelp Bay Group, undivided
Dcg
Conglomerate of the Kennel Creek Limestone
PzZp
Phyllite
Pzec
Lower Paleozoic black chert.  Derived from 1969-1970 Condon and Hoare field notes
KTrsi
Marine volcaniclastic sandstone, conglomerate, and argillite apparently cut by dikes or shallow intrusions
Jla
Lamprohyre and maifc dikes associated with Iliamna Volcano, thought to be Jurassic
Qhd
Domes associated with Holocene volcanic centers
Tgc
Gunners Cove Formation, tuffaceous conglomerate and sandstone, crystal-vitric basaltic tuff, thin basalt flows, and basaltic dikes
Tbp
Banjo Point Formation, sandstone, conglomerate, tuffaceous shale, and lapilli tuff of basaltic composition
TJgd
Gabbro and diorite, Tertiary to Jurassic age
TJm
Mafic intrusive rocks, Nyack terrane
TMzf
Basement rocks - fine-grained sedimentary rocks.
Tkv
Krugoli Formation, lava.
TMzbv
Basement rocks, including basaltic, spilitic, and keratophyric lava and tuff.  Pillow lava very common, western Aleutian Islands
Jsb
Igneous complex of Siniktanneyak Mountain, basalt at highest stratigraphic level.  Includes pillow breccia, part of ophiolite.
TJb
Basalt and andesite, Whitefish Lake volcanic field
Kofc
Coquina limestone of the Okpikruak Formation
Black phyllite, possibly metamorphosed Cannery Fm.
Trlt
Fossiliferous limestone from the northeast Taylor Mountains quadrangle
Cs
Middle or lower Cambrian thin-bedded platy limestone associated with coarse-grained silciclastic sandstone and granule conglomerate, possible shale
Zs
Dolostone, limestone, orthoquartzite, and minor chert
Trku
Ursus Member, Kamishak Formation
Trkm
Middle Member, Kamishak Formation
Trkb
Bruin Limestone Member, Kamishak Formation
DZsm
Orange weathering chloritic marble Brooks Range schist belt (see also 6950, 6951)
DSol
Beaucoup Formation, dark gray to orange weathering limestone (see also 7360)
PDcv
Cannery Formation metavolcanic and volcaniclastic rocks
JMvr
Rhyolite and dacite of Tozitna terrane
HFS
Hornfels and migmatite
SED
Clasitc sedimentary rocks
CARB
Carbonate sedimentary rocks
CHEM
Chemical sedimentary rocks
VOLC
Volcanic rocks
PLUT
Plutonic rocks
HYP
Hypabyssal rocks
LGM
Low-grade metamorphic rocks
HGM
High-grade metamorphic rocks
HGMC
High-grade metamorphic rocks, carbonates
Completely unknown
Greenschist of lower grade metavolcanic and metasedimentary rocks unit
Trmb
Dgg
Gambier Bay Formation, pyrite-bearing garnet-chlorite-amphibole-quartz-feldspar schist and gneiss
Dgs
Gambier Bay Formation, homogeneous layered garnet-chlorite-quartz-feldspar schist and semischist ; with minor dark gray phyllite and chlorite-actinolite schist
Dgp
Gambier Bay Formation, dark gray locally pyritic and graphitic semischist and phyllite; some quartz-rich semischist and Retreat Group; black siliceous phyllite on Admiralty Island
Pps
Pybus Formation, phyllite, slate, shale, siltstone, and graywacke member, also Sitth-gha-ee Peak Formation phyllite, slate, metagraywacke
Pybus Formation, chert member
Pzog
Four Winds Complex orthogniess
DOl
Thin-bedded to massive, fine-grained, limestone with local interbedded tuff and mafic volcanic rocks
Trw
Whitestripe Marble
Kyxg
Yakutat Group Greenstone
KJsv
Volcanic Rocks of the Sitka Graywacke
KJsgu
Sitka Graywacke, undivided
KJsgs
Sitka Graywacke graywacke and argillite
SOdsv
Metamorphosed and hornfelsed Descon Formation schist and semischist
Trw?
Whitestripe Marble?
Dwl
Wadleigh Limestone
Dcv
Karheen Formation volcanic and hypabyssal rocks
Dgu
Gambier Bay Formation, undivided, sedimentary and volcanic rocks, marble and recrystallized limestone, phyllite and semischist, and tuffaceous marlstone, pillow breccia, volcanic conglomerate, aquagene tuff, subordinate basaltic to andesitic pillow flows
PzZcg
Nisling Biotite gneiss
Nisling Schistose polymictic conglomerate
PDcsm
Cannery Formation slate and mable
MzZfm
Metabasic and metafelsic volcanic rocks, undifferentiated.
PDs
Metasiliciclastic rocks and minor carbonate rocks
MzPza
Black argillite and other low-grade metasedimentary rocks along the Tintina Fault zone
SCju
Jones Ridge Limestone (early Cambrian to Late Ordovician) and Road River Formation (Silurian)
CZu
Pzgs
Greenschist and other metamorphic rocks, undivided
Low-grade metasedimentary rocks of the Seventymile/Slide Mountain terrane
Trsf
Shublik Formation, black shale, sandstone, and silty limestone
JMsu
Strangle Woman Creek sequence, undivided
Jqs
Strangle Woman Creek sequence, quartzite and shale
JMqs
Strangle Woman Creek sequence, quartzite, shale, and sandstone
JMpu
Younger strata of the Porcupine River sequence, undivided
DCpu
Older strata of the Porcupine River sequence, undivided
Pzss
Schistose sandstone, Paleozoic(?)
Pzpr
Porcupine River sequence -- Argillite
KJsx
Khaz melange or melange associated with the Sitka Graywacke
KJks
Khaz melange, sandstone mass
Cenotaph Volcanics, undivided
White Pass Plutonic Province, Biotite granite and sphene-biotite granite
Jms
Micaceous, fine-grained black graywacke, siltstone, and slate, and gritty limestone.
TKgr
Granite and alaskite
TKgs
Syenitic rocks
TKgm
Quartz monzonite and quartz monzodiorite including Mount Estelle granodiorite
Jtb
Tuxedni Group, Bowser Formation
Jtt
Tuxedni Group, Twist Creek Siltstone
Jtc
Tuxedni Group, Cynthia Falls Sandstone
Jtf
Tuxedni Group, Fritz Creek Siltstone
Jtg
Tuxedni Group, Gaikema Sandstone
Jtrg
Tuxedni Group, Red Glacier Formation
Trd
Rhyolitic and dacitic tuff (44 Ma)
Chinitna Formation
Tpgr
Peralkaline granite
Tikchik terrane melange
SOdm
Marble, metamorphosed Decon Formation limestone
Cls
Medium- to thick-bedded, commonly light-gray to dark-gray lime mudstone
KMu
Melange-like assemblage of mafic volcanic rocks, chert, mudstone, argillite, graywacke and limestone
Jgb
Largely gabbroic rocks, may include minor ultramafic or dioritic rocks
Ksbm
Schrader Bluff Formation, middle member
Ksbl
Schrader Bluff Formation, lower member
Knu
Nanushuk Formation, upper part
Knl
Nanushuk Formation, lower part
Ksbu
Schrader Bluff Formation, upper member
Talb
Alkalic basalt flows and pyroclastic rocks
JTro
Probable dismembered altered ophiolite complex consisting of mafic flows, dikes, volcaniclastic rocks, and gabbro, subdivided:
JTropb
JTrot
JTrod
Diabasic intrusive rocks
JTropg
Pyroxene gabbro
JTrosu
JTrcs
Calcareous schist and phyllite
Jvt
Volcaniclastic turbidites
TrPrmb
Metabasaltic schist
TrPvs
Volcaniclastic glaucophane-hornblende-epidote schist
KPs
Carbonaceous shale, mudstone, and graywacke; subordinate limestone, chert, conglomerate, and mafic volcanic rocks; minor felsic volcanic rocks; and the metamorphosed and deformed equivalents
KPv
Andesitic or basaltic flows and locally fragmental rocks, subordinate clastic strata and carbonate, and the metamorphosed and deformed equivalents
Tmb
Olivine basalt flows and cinder cones
Pzta
Sedimentary rocks of the Tatonduk area, undivided.  Ranges through entire Paleozoic, diverse lithologies, many formal units lumped
Minto unit, Wilber Creek flysch and Wolverine quartzite, undivided
PzZl
Sedimentary and igneous rocks corresponding to the Livengood sequence of Weber and others (1992)
Sedimentary and igneous rocks corresponding to the Fairbanks-White Mountains sequence of Weber and others (1992)
TrPzd
Metasedimentary, metavolcanic, and sedimentary rocks of the Doonerak area (Other maps show as NSA 5565 and 6685)
DSskm
Metasedimentary and metaigneous rocks of the Hammond terrane, Brooks Range, lumping of many otherwise defined units
PzZmr
Metamorphic rocks, lenses near Kobuk and Victoria Creek fault systems, amphibolite facies
Zbi
Basic intrusive rocks
DZsi
Sedimentary and igneous rocks corresponding to older parts of the Schwatka-Rampart area sequence of Webber and others (1992)
Undivided sedimentary rocks of the Venetie terrane, Permian to Devonian?
KDvd
Deformed, disrupted, and metamorphosed mafic to intermediate and minor felsic volcanic rocks, (Gravina?)
KPsv
Shale, mudstone, graywacke, andesitic or basaltic rocks, subordinate chert and carbonate rocks
SOdu
Descon Formation, undivided sedimentary and volcanic rocks
Ogb
Hornblende gabbro and subordinate hornblende pyroxenite and hornblendite
Jkmb
Turbidites of Metervik Bay, subdividion of graywacke of Kulukak Bay (Weary Graywacke)
JTrcv
Coarse volcaniclastic sedimentary rocks
Volcaniclastic turbidites of Togiak Bay - Goodnews terrane
Jlt
Laminated tuffs and associated rocks
Jlgd
Granodiorite of Hagemeister Island, early Jurassic age
Jmv
Middle Jurassic interbedded volcanic and sedimentary rocks
Pvs
Permian volcaniclastic rocks
Jgs
Jvs
KJc
Argillite and tuffaceous chert
Jlvs
Volcanic and sedimentary rocks, possible Talkeetna equivalent
KJba
Basalt and andesite flows, Whitefish Lake volcanic field, Nyac terrane
MDm
Marble and metabasaltic dikes, Goodnews terrane
Qvdt
Viscous domes in young Hawaiian volcanic rocks, trachyte
Qvdm
Viscous domes in young Hawaiian volcanic rocks, mugearite and benmoreite
Qvdb
Viscous domes in young Hawaiian volcanic rocks, basalt
Qvm
Mugearite and benmoreite flows
Qvt
Trachyte flows
QTkv
Kula volcanic series and equivalents, undivided
Paniau Basalt
Glacialy scoured bedrock; may be covered with thin glacially derived deposits  [Relict NSACLASS code]
KJms
McHugh Complex, graywacke and conglomerate
KTrmc
McHugh Complex, basalt and chert
Kvml
Valdez Group, melange of Iceworm Peak
Paum
Massive, dark weathering, coarse to medium grained, hornblendite-gabbro (Boswell)
Lisburne Group, Tupik Formation, uppermost unit in western Alaska
Trks
Karen Creek Sandstone and Shublik Formation, undivided
Kingak Shale
KJtf
Telavirak Formation
KMaf
Arctic Foothills Assemblage
Kvt
Iditarod Volcanics, Kipchuk Volcanic Field, and similar units, tuff dominated units
Tosd
Orca Group, sheeted dikes, Paleocene and Eocene?
Zq
Quartzite, grit, and argillite.  Is this Wickersham?
TrPss
Shublik and Siksikpuk Formations, undivided
PaMlu
Lisburne Group, Alapah Limestone and informal upper unit
PaMla
Lisburne Group, Akmalik Chert
Mlgl
Lisburne Group, informal lower part
Dkys
Endicott Group, Kanayut Conglomerate - Stuver Member nonmarine shale and quartzite
Dkym
Endicott Group, Kanayut Conglomerate, middle member
Dkyl
Endicott Group, Kanayut Conglomerate - lower member, nonmarine shale
Mv
Volcanic rocks and sills associated with Lisburne Group
Mlgn
Lisburne Group, Nasorak Formation
Dbk
Baird Group, Kugururok Formation (limestone)
Dbe
Baird Group, Eli Limestone
DSb
Baird Group; Massive light gray reefoid limestone and dolomite with local thin interbeds of calcareous phyllite
JPp
Pogibshi Formation of Kelley (1980)
Trpg
Port Graham Formation of Kelley (1980)
TrPais
Imnaitchiak Chert, Etivluk Group equals chert of Siksikpuk Formation
Toeg
Gabbro or gabbro and diorite, Prince William Sound
Orca Group gabbro and diorite
Cv
Marmot -- Whale Mountain volcanics
Ci
Mafic intrusive rocks
Klu
Undivided Lower Cretaceous sedimentary rocks, northern Alaska
DZa
Calcareous schist - albite-rich subunit, western part of Schist belt
DZmc
Calcareous schist - metachert and conglomerate subunit, Schist belt
Kmn
Migmatite associated with Cretaceous plutons of southern Brooks Range
Khs
Rocks of Hammond River shear zone
Algal boundstone in SW Alaska
Spl
Black phyllite and metalimestone
Black shale and chert, Triassic
PzZel
Marble and intercalated gneissic rocks, early Paleozoic or preCambrian
DZsg
Schist and paragneiss, Arrigetch-Igikpak thermal high
PzZacs
Quartz-rich metasedimentary rocks, Brooks Range Central belt and part of Northern thrust assemblages
Dvr
Metamorphosed sills, dikes, and flows of andesite to rhyolite composition
Kgdf
Foliated granodiorite
Lisburne Group, Wahoo Limestone, uppermost unit in eastern Alaska
Dbf
Beaucoup Formation, Ferriginuous and Calcareous schist
Dbv
Beaucoup Formation, including volcanic rocks or volcanic rock clasts
Dhfm
Hunt Fork Shale, metamorphosed
PzZcm
Metasedimentary and metavolcanic rocks, undivided
JDk
Rocks of the Kivivik Creek sequence
Mkkl
Endicott Group, Kekiktuk Conglomerate, and Kayak Shale and Lisburne Group, undivided.
Older carbonate rocks of the Nanielik antiform,
Ordovician carbonate rocks of the Nanielik antiform,
Zog
Ernie Lake pluton orthogneiss
Pzpc
Carbonate rocks of phyllite belt
PzZb
Metasedimentary rocks of Bluecloud Mountain, gray phyllite, dark-gray to black metaquartzite, calcareous phyllite, and impure marble
Dvf
Very light gray to brownish red weathering resistant schistose felsic volcanic rocks, not Ambler sequence
JCs
Sandstone, shale, argillaceous limestone, limestone, dolostone, mudstone, chert and siltstone in north-central Wiseman quadrangle.  The unit conformably overlies the Kanayut Conglomerate of the Endicott Group. Consists of Kayak Shale of the Endicott Grou
SOj
Metasedimentary rocks of Jesse Mountain,  fine grained, phyllitic to schistose, gray-weathering meta-argillite, black-weathering metaquartzite, marble, and brown weathering impure marble
SCvs
Volcanic and sedimentary rocks, Doonerak antiform
MzDm
Igneous and sedimentary rocks of the Maiyumerak Mountains
Jtw
Diorite of southeast Alaska
TKmg
Gneissose mafic rocks
Jgaa
Largely gabbroic rocks, may include minor ultramafic or dioritic rocks, associated with Alaska-Aleutian Range batholith
Older strata of the Porcupine River sequence, quartzite; might be eguivalent to St. Cyr in eastern Yukon
OCfm
Franklin Mountain, Dolomite succession with local basal quartzite and red bed member
OCbs
Broken Skull, Dolomite succession with local basal quartzite and red bed member
ZYkt
Katherine and Tigonkweine:  Mature, very fine grained, thin to very thick bedded, brown, greenish grey and white orthoquartzitic sandstone with recessive intervals of dark grey to black shale; rare stromatolitic dolomite
Zr
Rapitan:  Basal rift conglomerates (1) overlain by glacial diamictite (2) in turn succeeded by fine to coarse siliclastic rocks (3) and equivalent dolostone (4)
Zsb
Sheepbed:  Recessive, black weathering shale and siltstone; minor quartzite and limestone
Pzms
Marble of the Schist Belt
Trcl
Early Trissic limestone of Chulitna region
Trvt
Middle Triassic or older red-colored tuff, basalt, graywacke, and conglomerate
Temv
Lavas and pyroclastic deposits, early Miocene; Unga Arc
Tpv
Intermediate to mafic volcanic rocks, Paleocene
Tgh
Hypabyssal granitic rocks
Tpd
Biotite diorite
Kvi
Intermediate and felsic volcanic rocks
Kivs
Intermediate volcanic and sedimentary rocks
Feldspathic sedimentary rocks
Kesv
Turbiditic sedimentary and volcanic rocks
Kyh
Graywacke of the Yenlo Hills
Jetr
Early Jurassic granite and granodiorite of Hidden terrane (Chugach Mountains)
Jeqt
Early Jurassic quartz diorite and tonalite of Hidden terrane (Chugach Mountains)
Jemi
Early Jurassic mafic and intermediate plutonic rocks of Hidden terrane (Chugach Mountains)
OZl
DZng
Nome Complex, undivided
Dnd
Nome Complex dolostone, metalimestone, and marble
DSns
Nome Complex, pelitic, calcareous, and graphitic schist
Dnps
Nome Complex, pelitic schist
DOnb
Nome Complex, black metalimestone and marble
DCbm
Black marble, Nome Complex
DCnk
Nome Complex, Calcareous schist of Kwinnik Mountain
DOnx
Nome Complex, mixed marble, graphitic metaquartzite, and schist
DOnx1
Nome Complex, mixed marble, graphitic metaquartzite, and schist (overlay)
Snd
Nome Complex, dolostone
Cnd
Nome Complex, old dolostone
Pzng
Nome Complex metagabbro and metasedimentary rocks
Pznm
Nome Complex marble
Pznd
Nome Complex dolostone, undivided
MzPzmk
Metamorphosed mafic rocks, metatonalite and serpentinite, Kugruk Fault Zone
Jsct
Spruce Creek tonalite, Kugruk Fault Zone
Kmad
Alkaline dikes
PzZh
Nome Complex high-grade schist
Nome Complex high-grade marble
PzZt
Metasiltstone and phyllite, Grantley Harbor Fault Zone
Metalimestone, Grantley Harbor Fault Zone
Pzpa
Phyllite and argillite, Grantley Harbor Fault Zone
Dgn
Orthogneiss within Nome Complex
SOig
Iviagik Group, undivided
Tpg
Granitic rocks, ranging from granite to granodiorite, mostly felsic
Tpag
Peralkaline granite and related rocks
Older granite and granodiorite, about 50 Ma; generally in southern and southeast Alaska
Mzs
Semischist
Mzgn
Quartzofeldspathic banded biotite gneiss and hornblende gneiss
MzPzsv
Siliceous metasedimentary and metavolcanic rocks
Undivided tectonized rocks (Melange?)
Trp
Povas unit of Yukon, andesitic basalt flows, breccia, tuff, sandstone and argillite; local dacitic breccia and tuff with minor limestone; greenschist, chlorite schist, chlorite-augite-feldspar gneiss, amphibolite
Modern Aleutian arc volcanic rocks, andesite
Modern Aleutian arc volcanic rocks, basalt
Modern Aleutian arc volcanic rocks
Jof
Ogotoruk Formation, Late Jurassic, Oxfordian-Tithonian
Mzsu
Cretaceous through Triassic sedimentary rocks, undivided
KJto
Telavirak and Ogororuk Formations, undivided (KJot, PH004)
Qge
Glacio-estuarine deposits including Hood Lake  and Mole Creek deposits (h, mC, AN007; Qh, Qh+, Qmc, TY008; Qts, KN013; SV007)
Qgk
Kame fields, and a few narrow and sinuous eskers that contain mainly gravel and sand, poorly to well-bedded and sorted (Qp, Qk3, Qk2, v, AN007; Qk, Qkd, TK008)
Qgme
Morainal deposits inferred to have been modified during glacioestuarine inundation (N, T, AN007; Qmm, TY008)
Qbc
Bootlegger Cove Formation (bc, AN007; Qbc, TY008)
Qgx
Deposits of complex origin in the central Cook Inlet basin (FI, AN007; Qf, TY008)
Qod
Deposits related to but peripheral to older glaciations, primarily associated with Cook Inlet region (Qge, K, AN007; Qkd, TY008)
Qoc
Channeled glacial deposits -- kame and kettle? (Qoc, TY007; TL004; 13f, TL007; TY016)
Zv
Metavolcanic rocks (Zv, BN005)
Qal
Argillaceous limestone and limestone (Oal, TE002; TE004)
Tct
Carbonate-terrigenous formations in Bering Sea (Pg2-3, BE002)
Tomg
Migmatite associated with Tertiary plutons (TKmm, MF003)
Ksr
Sandstone (Ksr, MK004)
Qewk
Kame and kame deposits associated with early glaciations
Qmik
Illinoian glaciation, kame deposits
OZt
Sandstone, siltstone, and limestone, York terrane (OZt, TE004; SEWPEN)