G U L F O F A L A S K A

Prince William

Sound

Middleton Island

Kayak Island

MONTAGUE

ISLAND

HINCHINBROOK

ISLAND

YAKUTAT BAY

BARANOF

ISLAND

CHICHAGOF

ISLAND

Zarembo

Island KUIU

ISLAND

Anchorage

Cordova

Fairbanks

Haines

Juneau

Ketchikan

Petersburg

Seward

Sitka

Valdez

Y U K O N 

R I V E

R

Circle

Tok

Eagle

Healy

Craig

Nenana

Willow

Gulkana

Chitina

Skagway

Yakutat

Annette

Cantwell

McCarthy

Big Delta

Talkeetna

Beaver

Wasilla

Palmer

Aialik Bay

Bay of Isles

B l y i n g S o u n d

Cape Saint Elias

Cross Sound

Demarcation

Point

Glacier Bay

Harris Bay

Prudhoe Bay

Turnagain Arm

Knik Arm

Camden Bay

Mikkelsen Bay

Foggy Island Bay

Gwydyr Bay

A R C T I C O C E A N

Resurrection Bay

Day Harbor

M o n t a g u e S t r a i t

Valdez 

Arm

Orca Bay

Port Gravina

Port Fidalgo

Port Wells

Eaglek Bay

Unawik Inlet

Knight Island Passage

COPPER

 RIVER

Icy Bay

Lynn 

Canal

Icy Strait

Ch a t h

a

m

S tr a i t

St ephens Passage

Frederick Sound

Sitka Sound

Sumner Strait

Iphigenia Bay

Clarence 

 Strait

D i x o n

E n t r a n c e

R e v i l l a g i g e d o Ch a n n e l

Glenn Highway

Parks Highway

Richardson H gi hway

Alaska Highway

Alaska Highway

Richardson Highway

Parks 

Highway

Dalton Highway

Steese Highway

Wrangell

Hoonah

Fort Yukon

Kake

Charley

River

Ignek Valley

Kruzof

Island

Little Pybus

Bay

Long Dall Island Island

Sumez

Island

Oily Lake

Port Camden

Wingham Island

Matanuska Valley

Angoon

Port

Alexander

Sagwon

Chandalar River

Porcupine River

 R A N G E S

F A

U

L T

Seward Highway

T A N A N A

 

R

I

V E R

Susitna River

P A C I F I C O C E A N

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QTs

QTs

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QTs

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QTs

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QTs

QTs

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QTs

QTs

QTs

QTs

QTs

A L E U T I A N I S L A N D S

ADAK

ISLAND

AMCHITKA

ISLAND

KISKA

ISLAND

Buldir

Island

Semisopochnoi

Island

Hawadax

Island

Little Sitkin

Island Gareloi

Island

TANAGA

ISLAND

KANAGA

ISLAND

Great Sitkin

Island ATKA

ISLAND

AMLIA

ISLAND

SEGUAM

ISLAND

Adak

Andrew Bay

A N D R E A N O F

I S L A N

D

S

Seguam Pass

Kasatochi

Island

Adak Strait

Bay of Waterfalls

Kanaga Pass

Tanaga Bay

Kanaga Sound

Amchitka Pass

RAT ISLANDS

Vega Bay

Kiska Harbor

Oglala Pass

Rat Island Pass

Tanaga Pass

Chugul Pass

Sitkin Sound

Korovin Bay

Nazan Bay

Gunners Cove

Kavalga

Island

Ogliuga

Island

Ulak

Island

Tvme

QTvi

Tvcs

Tsmo

Tmi

Tvme

Toeg

Tmi

Tsmo

Tvme

QTvi

Tv

Tvcs

Thi

QTvi

QTvi

Tv

QTvi

Tmi

QTvi

Tvcs

Tvme

Tvpm

QTvi

Tvcs

QTvi

Tv

QTvs

QTvi

QTvi

QTs

QTs

QTs

174°

174°

177°

177°

180°

180°

177°

177°

52°

51°

Any use of trade, product, or firm names in this publication is for descriptive purposes 

only and does not imply endorsement by the U.S. Government

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, 

Denver, CO 80225, 1–888–ASK–USGS

Digital files available at http://dx.doi.org/10.3133/sim3340

Suggested citation: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M, comps., 2015, 

Geologic map of Alaska: U.S. Geological Survey Scientific Investigations Map 3340, 

pamphlet 197 p., 2 sheets, scale 1:1,584,000, http://dx.doi.org/10.3133/sim3340.

ISSN 2329-132X (online)

http://dx.doi.org/10.3133/sim3340

ISSN 2329-1311 (print) 1

U.S. Geological Survey;

2

National Park Service;

3

C.G. Mull Technical Services

Geologic Map of Alaska

Compiled By

Frederic H. Wilson1, Chad P. Hults2, Charles G. Mull3, and Susan M. Karl1

2015

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ALPHABETICAL LIST OF MAP UNITS

[See Description of Map Units (pamphlet) for complete unit descriptions. Some unit exposures on printed 

or plotted maps are too small to distinguish color for unit identification. These units are labeled where 

possible, and unlabeled units are attributed in the digital files. Map unit label: labels shown in colored 

boxes identify generalized units on map. Map unit name: bold, generalized unit shown on map; not bold, 

component unit included in generalized unit on map (described in Description of Map Units and included 

in digital files, but not shown on map as separate unit). Names within parentheses indicate higher level 

groups that include map unit; Angayucham is an abbreviation for the group, "Angayucham, Tozitna, and 

Innoko asssemblages and Rampart Group." Age or stratigraphic position: bold, relative age or stratigraphic position of map unit; not bold, component unit. Region (fig. 2, sheet 1): AL, Aleutian Islands; AP, 

Alaska Peninsula; CN, central; EC, east-central; NE, northeast; NR, northern; NW, northwest; SC, 

south-central; SE, southeast; SO, southern; SP, Seward Peninsula; ST, statewide; SW, southwest; WC, 

west-central. Page number: Location of description of map unit or component unit in Description of Map 

Units (pamphlet). Labeled map units without page numbers do not have separate descriptions in the 

Description of Map Units (see component unit descriptions)]

Bedrock of unknown type or age or areas not mapped (unknown)—ST; p. 142

Volcanic rocks and sills (Pennsylvanian? to Devonian)—Includes the following units:

Clgv Volcanic rocks and sills associated with Lisburne Group (Pennsylvanian? and 

Mississippian)—NR; p. 87

MDtv Tuffaceous volcanic rocks (Mississippian? to Devonian)—NW; p. 121

Dv Metavolcanic rocks and sills (Devonian)—NR; p. 123

Lisburne Group, undivided (Carboniferous)—NR; p. 50

Wahoo, Alapah, and Wachsmuth Limestones (Lisburne Group) (Middle Pennsylvanian 

to Mississippian)—Includes the following units:

lgw Wahoo Limestone (Middle and Lower Pennsylvanian and Upper 

Mississippian?)—NE; p. 51

Mlga Alapah Limestone (Upper Mississippian)—NE; p. 52

Mlgw Wachsmuth Limestone (Mississippian)—NE; p. 52

Tupik and Kogruk Formations (Lisburne Group) (Pennsylvanian to Upper 

Mississippian)—Includes the following units:

Clgt Tupik Formation (Pennsylvanian and Upper Mississippian)—NW; p. 50

Clgk Kogruk Formation (Upper Mississippian)—NW; p. 50

Rainbow chert (Togiak-Tikchik Complex) (Carboniferous?)—SW; p. 135

Adams Argillite (Cambrian)—EC, NE; p. 73

Tindir Group (Cambrian? and Proterozoic)—EC, NE; p. 73

Wales Group, undivided (Cambrian to Proterozoic)—SE; p. 128. Includes the following 

unit:

wgm Wales Group marble (Cambrian to Proterozoic)—SE; p. 129

Wickersham and Neruokpuk units (Cambrian and Proterozoic)—EC, CN, NE; p. 73

Bimodal metavolcanic rocks (Devonian)—NR; p. 122

Beaucoup Formation, undivided (Devonian)—NR; p. 56. Includes the following units:

Dbfl Limestone and similar rocks (Upper and Middle Devonian)—NR; p. 56

Dbfw Wacke member (Upper Devonian)—NR; p. 56

Karheen and Cedar Cove Formations (Devonian)—SE; p. 63

Baird Group and similar rocks (Middle Devonian to upper Cambrian)—NE, NW; p. 64 

Includes the following unit:

Dke Kugururok Formation and Eli Limestone (Devonian)—NE, NW; p. 65

Metaturbidite marble and calcareous schist (Nome Complex) (Devonian to 

Cambrian)—SP; p. 142

Schist and phyllite of the Alaska Range (Devonian or older)—Includes the following units:

arqm Pelitic and quartzose schist of the Alaska Range (Devonian or older)—SC; p. 124

DOmvs Yanert Fork sequence of Csejtey and others (1992) and correlative rocks 

(Devonian to Ordovician?)—SC; p. 124

Farewell basinal facies carbonate rocks (Devonian or older)—Includes the following units:

Dd White Mountain sequence, basinal facies (Devonian to Cambrian or older)—SW, 

WC; p. 59

DSbr Barren Ridge Limestone and correlative units (Devonian to Silurian?)—WC; 

p. 59

DSpf Paradise Fork Formation and correlative units (Lower Devonian and 

Silurian)—SW; p. 60

Hunt Fork Shale (Endicott Group) (Devonian)—NR; p. 54

Noatak Sandstone (Endicott Group) (Upper Devonian)—NR; p. 54

Gambier Bay Formation, undivided (Devonian)—SE; p. 122. Includes the following unit:

Dgbm Marble of the Gambier Bay Formation (Devonian)—SE; p. 122

Older plutonic rocks of southeast Alaska (Early Devonian to Ordovician)—Includes the 

following units:

DOgi Syenite, trondhjemite, and granite (Early Devonian to Ordovician?)—SE; p. 108

Ogi Granodiorite and related rocks (Ordovician)—SE; p. 108

Thin-bedded limestone (Lower Devonian to Ordovician)—SW; p. 66

Shale, chert, and argillite (Lower Devonian to Ordovician)—Includes the following units:

DOka McCann Hill Chert, Road River Formation, and Troublesome unit of Weber and 

others (1992) (Lower Devonian to Ordovician)—EC; p. 66

DOhb Hood Bay Formation (Lower? Devonian to Ordovician)—SE; p. 66

St Turbidite deposits of southeast Alaska (Silurian)—SE; p. 69

Slc Lost Creek unit (Silurian)—CN; p. 70

Metasedimentary and metavolcanic rocks of Tukpahlearik Creek, undivided (Devonian to 

Ordovician)—NW; p. 123. Includes the following units:

DOtu Metasedimentary and metavolcanic rocks of Tukpahlearik Creek, undivided 

(Devonian to Ordovician)—NW; p. 123

DOtm Marble of Tukpahlearik Creek (Devonian to Ordovician)—NW; p. 124

DOtp Pelitic schist and metavolcanic rocks of Tukpahlearik Creek (Devonian to 

Ordovician)—NW; p. 124

Metasedimentary and metavolcanic rocks of the Central Belt and Northern Thrust 

assemblage of Till and others (2008a) (Devonian to Proterozoic)—Includes the following units:

Dasm Mixed assemblage of metasedimentary and metavolcanic rocks in the Brooks 

Range (Devonian to Proterozoic)—NR; p. 126

Dsgm Schist, paragneiss, and marble (Devonian to Neoproterozoic)—NR; p. 125

Sbs Black phyllite and metalimestone (Silurian)—NR; p. 127

b Metasedimentary rocks of Bluecloud Mountain (early Paleozoic to 

Proterozoic?)—NR; p. 129

Gneiss, amphibolite, schist, quartzite, and marble (Yukon-Tanana crystalline complex) 

(Devonian or older)—Includes the following units:

yms Mafic schist and amphibolite (Devonian or older Paleozoic)—EC; p. 117

ybg Biotite gneiss, marble, schist, quartzite, and amphibolite (Devonian or 

older)—EC; p. 117

Older carbonate rocks of northern Alaska (Lower Devonian to Proterozoic?)—Includes the 

following units:

DZnl Mount Copleston Limestone and Nanook Limestone (Lower Devonian to 

Ediacaran)—NE; p. 65

Ols Limestone, northern Alaska (Ordovician through Proterozoic?)—NR; p. 72

Brooks Range schist belt (Devonian to Proterozoic)—Includes the following units:

Daqm Quartz-mica schist of the Brooks Range (Devonian to Proterozoic)—NR; p. 125

Dacs Calcareous schist of Brooks Range (Devonian to Proterozoic)—NR; p. 126

Pelitic schist and quartzite and mafic interbeds (Yukon-Tanana crystalline complex) 

(Devonian and older)—Includes the following units:

yqs Quartzite and pelitic schist (Devonian and older)—EC; p. 116

yqm Pelitic schist, including Chena River sequence (Devonian and older)—EC; 

p. 117

Shallow-marine, carbonate-dominated rocks (Devonian and Silurian)—Includes the 

following units:

DSld Shallow-marine carbonate-dominated rocks (Devonian and Silurian?)—CN; 

p. 62

Dlse Carbonate rocks of southeast Alaska (Devonian)—SE; p. 63

DSt Tolovana Limestone (Middle Devonian to Silurian, Llandovery?)—CN; p. 64

Dof Ogilvie Formation (Middle to Lower Devonian)—CN; p. 64

Sl Limestone, southeast Alaska (Silurian)—SE; p. 70

Older ultramafic rocks of southeast Alaska (Devonian and Silurian)—SE; p. 108

Basalt, andesite, and sedimentary rocks (Devonian)—Includes the following units:

Dfr Freshwater Bay and Port Refugio Formations (Late Devonian)—SE; p. 87

Dmv Mixed volcanic rocks of southeast Alaska (Middle to Early Devonian)—SE; 

p. 87

Sv Volcanic rocks in southeast Alaska (Silurian)—SE; p. 88

Woodchopper Volcanics and Schwatka unit of Weber and others (1992) (Devonian)—EC; 

p. 87

Farewell platform facies (Upper Devonian, Frasnian, to Neoproterozoic)—SW; p. 61. 

Includes the following units:

DSwc Whirlwind Creek Formation and correlative units (Upper Devonian, Frasnian, 

through Silurian, Ludlow)—SW; p. 61

Ols Lime mudstone (Ordovician)—SW; p. 61

Zls Dolostone, limestone, orthoquartzite, and minor chert (Cambrian and 

Neoproterozoic?)—SW, WC; p. 62

Clastic and carbonate rocks of the Yukon Flats Basin (Devonian to Neoproterozoic?)— 

Includes the following units:

Dnr Nation River Formation (Upper and Middle? Devonian)—EC; p. 57

Dcr Cascaden Ridge and Beaver Bend combined correlative units (Devonian)—CN; 

p. 57

Dq Quail unit of Weber and others (1992) (Upper Devonian)—CN; p. 57

Dyp Phyllite, slate, and black shale (Devonian?)—NE; p. 57

Dyss Clastic and calcareous clastic rocks (Devonian)—NE; p. 58

pr Older clastic strata of the Porcupine River sequence of Brosgé and Reiser (1969) 

(lower Paleozoic)—NE; p. 58

DZkb Older carbonate strata of the Porcupine River sequence of Brosgé and Reiser 

(1969) and equivalent units (Middle Devonian to Neoproterozoic?)—CN, 

NE; p. 58

Sedimentary and metasedimentary rocks of York terrane (Lower Devonian to 

Ordovician)—Includes the following units:

gp Phyllite and argillite, Grantley Harbor Fault Zone (lower Paleozoic)—SP; p. 67

DSyl Limestone of the Seward Peninsula (Lower Devonian and (or) Silurian)—SP; 

p. 67

SOyl Dark limestone (Silurian and Upper Ordovician)—SP; p. 67

SOyld Limestone, dolostone, and shale (Silurian and Ordovician)—SP; p. 67

Oyl Argillaceous limestone and limestone (Middle and Lower Ordovician)—SP; 

p. 68

Bokan Mountain peralkaline granite and syenite (Middle Jurassic)—SE; p. 103

Mystic structural complex, undivided (Jurassic to Devonian)—SW; p. 37

Igneous rocks (Angayucham) (Jurassic to Devonian)—NE, NR, SW, WC; p. 30

Intermediate to mafic plutonic rocks (Early Jurassic)—Includes the following units:

Jg Plutons of the Yukon-Tanana Upland (Early Jurassic)—EC; p. 104

Jhg Plutonic rocks of Hidden terrane (Early Jurassic)—SC; p. 104

Jegd Granodiorite of Hagemeister Island (Early Jurassic)—SW; p. 104

Graywacke of Kulukak Bay of Hoare and Coonrad (1978) (Upper to Middle 

Jurassic)—SW; p. 39

Plutonic rocks (Late and Middle Jurassic)—Includes the following units:

Jtr Trondhjemite (Jurassic)—SC, SW, WC; p. 100

Jise Granitic rocks of southeast Alaska (Jurassic)—SE; p. 100

Jgr Jurassic phase, Alaska-Aleutian Range batholith, undifferentiated 

(Jurassic)—SC, SW; p. 102

Jit Spruce Creek tonalite (Middle Jurassic)—SP; p. 103

Cherty tuff and breccia (Angayucham) (Jurassic? to Mississippian)—WC; p. 31

Clastic and carbonate rocks, Porcupine River region (Jurassic to Mississippian)—Includes 

the following units:

JMpu Younger strata of the Porcupine River sequence of Brosgé and Reiser (1969), 

undivided (Jurassic to Mississippian)—EC, NE; p. 39

JMsu Strangle Woman Creek sequence of Brosgé and Reiser (1969), undivided 

(Jurassic to Mississippian)—EC; p. 39

Kakhonak Complex and Tlikakila complex of Carlson and Wallace (1983) (Jurassic, 

Triassic, and older?)—SC, SW; p. 138

Calcareous and metabasaltic schist and phyllite (Togiak-Tikchik Complex) (Early Jurassic 

to Permian)—SW; p. 134

Etivluk Group, undivided (Middle Jurassic to Pennsylvanian)—NR; p. 40. Includes the 

following units:

Jo Otuk Formation (Middle Jurassic to Triassic)—NR; p. 40

eg Siksikpuk Formation and Imnaitchiak Chert (Triassic to Pennsylvanian)—NR; 

p. 41

Chulitna sequence, undivided (Jurassic to upper Paleozoic)—Includes the following units:

Jct Crystal tuff, argillite, chert, graywacke, and limestone (Upper Jurassic to Upper 

Triassic?)—SC; p. 36

Jrb Red and brown sedimentary rocks and basalt (Lower Jurassic and Upper 

Triassic)—SC; p. 36

lb Limestone and basalt sequence (Upper Triassic, Norian)—SC; p. 37

vs Volcanic and sedimentary rocks (Lower Triassic to upper Paleozoic)—SC; p. 37

rs Red beds (Triassic, Norian and older?)—SC; p. 46

Northern Alaska sedimentary rocks (Middle Jurassic to Carboniferous)—NR; p. 41

Shelikof and Chinitna Formations and Tuxedni Group (Middle Jurassic)—Includes the 

following units:

Jsc Shelikof and Chinitna Formations (Middle Jurassic, Callovian)—AP, SC; p. 39

Jt Tuxedni Group (Middle Jurassic)—AP, SC; p. 40

Talkeetna Formation (Early Jurassic)—AP, SC; p. 84

Limestone and volcanic rocks of the Kenai Peninsula (Early Jurassic and Late Triassic, 

Norian)—Includes the following units:

pg Port Graham formation of Kelley (1980) (Upper Triassic, Norian)—SC; p. 44

Jpf Pogibshi formation of Kelley (1980) (Early Jurassic and Late Triassic?)—SC; 

p. 85

Tatina River volcanics of Bundtzen and others (1997a) (Mystic structural complex) 

(Jurassic and Triassic)—Includes the following units:

Jmv Tatina River volcanics of Bundtzen and others (1997a) and similar mafic volcanic 

rocks (Jurassic and Triassic)—WC; p. 37

Jv Tatina River volcanics of Bundtzen and others (1997a), gabbro and diorite 

(Jurassic and Triassic)—SC, WC; p. 37

Newenham ophiolite complex (Jurassic and Triassic)—SW; p. 138

Blueschist of southern Alaska (Early Jurassic to Triassic)—SC, SW; p. 112

Spiculitic rocks (Lower Jurassic and Upper Triassic)—Includes the following units:

Jmc McCarthy Formation (Lower Jurassic and Upper Triassic)—SC; p. 42

sl Spiculite and sandy limestone (Upper Triassic, Norian)—WC; p. 42

Mafic and ultramafic rocks in central, western, and northern Alaska (Jurassic to late 

Proterozoic)—Includes the following units:

Job Ophiolite of the Brooks Range (Jurassic to Triassic?)—NW; p. 101

Jtu Ultramafic complexes of western Alaska (Jurassic or older)—NE, NW, WC; 

p. 101

yo Peridotite of dismembered ophiolite of the Yukon-Tanana region (Mesozoic, 

Triassic? or older)—EC; p. 105

c Carbonatite (Late Triassic)—CN; p. 105

ig Gabbro and diabase (Triassic or late Paleozoic)—CN; p. 106

mi Mafic igneous rocks, central and northeast Alaska (early Paleozoic and (or) late 

Proterozoic)—CN, NE; p. 108

Coquina and calcarenite (Lower Cretaceous)—Includes the following units:

Kqcs Quartz-carbonate sandstone and pebbly mudstone (Lower Cretaceous, Aptian to 

Valanginian)—SW; p. 32

Kcm Calcareous mudstone (Lower Cretaceous)—SE; p. 33

Khnl Herendeen Formation and similar units (Lower Cretaceous)—AP, EC, NR, SC, 

SW; p. 33

Calcareous graywacke and conglomerate (Lower Cretaceous, Albian to Aptian)—SW, 

WC; p. 26

Chugach accretionary complex (Cretaceous)—Includes the following units:

Kaf Chugach flysch (Upper Cretaceous)—SC, SE, SW; p. 17

Kafv Volcanic rocks of Chugach accretionary complex (Upper Cretaceous)—SC, SE; 

p. 18

Ksg Sitka Graywacke, undivided (Cretaceous)—SE; p. 21

Calcareous graywacke and mudstone, volcanic graywacke and conglomerate (lower Upper 

or upper Lower Cretaceous)—WC; p. 23

Togiak-Tikchik Complex, undivided (Mesozoic to Devonian)—SW; p. 133

Granodiorite and other plutonic rocks (Early Cretaceous, Aptian to Hauterivian)—SC, 

SE, WC; p. 98

Flysch (Upper and Lower? Cretaceous)—SC; p. 23

Rocks of Hammond River shear zone of Till and others (2008a) (Cretaceous)—SP; p. 110

Mafic igneous-clast conglomerate, sandstone, and mudstone (Lower Cretaceous)—WC; 

p. 26 

Andesite and basalt (Early Cretaceous and Jurassic)—Includes the following units:

KJiv Andesitic volcanic rocks (Early Cretaceous and Late Jurassic?)—NW, SW, WC; 

p. 83

Jab Andesite and basalt (Jurassic)—SW; p. 84

Gravina-Nuzotin unit (Lower Cretaceous and Upper Jurassic)—SC, SE, SW; p. 28. 

Includes the following unit:

KJgv Volcanic rocks of the Gravina-Nutzotin belt (Lower Cretaceous or Upper 

Jurassic?)—SC, SE; p. 28

Plutonic rocks and dikes (Cretaceous to Jurassic)—Includes the following units:

Kgu Plutonic rocks and dikes, granite to diorite (Cretaceous?)—EC, SC, SP, SW, 

WC; p. 96

KJg Quartz monzodiorite (Cretaceous to Jurassic)—SC, SW; p. 99

Fine-grained sedimentary and metasedimentary rocks (Cretaceous or Jurassic)—EC; 

p. 22

Saint Elias suite of Gordey and Makepeace (2003) and similar rocks (Early Cretaceous 

and Late Jurassic)—SC, SE; p. 99

Staniukovich and Naknek Formations, Kotsina Conglomerate, and similar rocks of 

southern Alaska (Lower Cretaceous to Jurassic, Pliensbachian)—Includes the following units:

Kst Staniukovich Formation (Lower Cretaceous)—AP; p. 35

Jnk Naknek Formation and Kotsina Conglomerate (Upper Jurassic, Tithonian to 

Oxfordian)—AP, SC; p. 35

Js Marine sedimentary rocks of the Wrangell Mountains, undivided (Jurassic, 

Kimmeridgian to Pliensbachian)—EC; p. 35

Volcano-plutonic complexes (Cretaceous and Jurassic)—Includes the following units:

Kmvi Mafic to intermediate volcano-plutonic complexes (Late Cretaceous)—SW, WC; 

p. 83

KJv Highly altered volcanic rocks in southwest Alaska (Cretaceous or Jurassic)—SW; 

p. 83

Yakutat Group, undivided (Lower Cretaceous and Upper Jurassic?)—SC, SE; p. 22

Graywacke of the Yenlo Hills (Cretaceous? and uppermost Jurassic)—SC; p. 22

Kuskokwim Group, undivided (Upper Cretaceous to upper Lower Cretaceous)—SW; 

p. 20

Kemik Sandstone (Lower Cretaceous, Hauterivian)—NR; p. 27

Flysch and quartzite, Kandik Group and equivalents (Lower Cretaceous, Albian to 

Valanginian)—EC; p. 27

Intermediate granitic rocks (Late Cretaceous)—SC, SP, SW, WC; p. 96. Includes the 

following unit:

Klqm Quartz monzonite and monzonite (Late Cretaceous)—SC, SW; p. 96

Granitic rocks of central and southeast Alaska (Cretaceous, Coniacian to Albian)—EC, 

SC, SE, WC; p. 97. Includes the following units:

Kmqm Quartz monzonite, monzonite, and syenite (Cretaceous, Coniacian to 

Albian)—CN, EC, SE, SP, WC; p. 97

Ksy Syenitic rocks (Cretaceous, Coniacian to Albian)—NW, WC; p. 97

Migmatite and metaplutonic rocks (Cretaceous)—EC, NE, SC, SE; p. 110

West-central Alaska mélange (Angayucham) (Cretaceous or older)—Includes the following 

units:

KJm Mélange facies (Cretaceous or Jurassic?)—NR, WC; p. 30

KMmu West-central Alaska mélange-like rocks (Cretaceous or older)—WC; p. 30

Mafic and shoshonitic volcanic rocks (Early Cretaceous)—Includes the following units:

Ksbd Spilitic pillow basalt and diabase (Early Cretaceous?)—NW; p. 83

Ksv Shoshonitic flows and tuff (Early Cretaceous)—WC; p. 84

Marine sandstone and siltstone (Cretaceous, Cenomanian to Albian)—SC, WC; p. 24

McHugh and Uyak Complexes and similar rocks (Late Cretaceous)—Includes the following units:

Kumc McHugh and Uyak Complexes (Late Cretaceous)—AP, SC; p. 136

Kcct Cape Current terrane (Upper Cretaceous)—SW; p. 19

Nonmarine to shelf sedimentary rocks (Tertiary? and Cretaceous)—Includes the following 

units:

Kcs Chignik Formation and similar units in southern Alaska (Upper Cretaceous)—AP, 

SW; p. 16

Khk Hoodoo and Kaguyak Formations (Upper Cretaceous)—AP; p. 17

Kmf Minto unit (Upper Cretaceous?)—EC; p. 19

Ksd Sandstone, shale, and conglomerate deltaic deposits (Upper and upper Lower 

Cretaceous)—EC, SC, SW, WC; p. 19

TKis Intricately intruded areas of volcanic graywacke and mudstone (Tertiary or Upper 

Cretaceous)—WC; p. 20

Kcc Carbonate-rich conglomerate and sandstone deltaic rocks (Cretaceous)—SP, 

NW; p. 21

Kqc Quartz-pebble conglomerate, west-central Alaska (lower Upper Cretaceous to 

upper Lower Cretaceous)—WC; p. 22

Ktu Tuluvak Formation (Upper Cretaceous, Coniacian to upper Turonian)—NR; 

p. 22

Sedimentary rocks of the North Slope (Cretaceous, Cenomanian to Albian)—Includes the 

following units:

Knf Nanushuk Formation (Cretaceous, Cenomanian to Albian)—NR; p. 24

Kto Torok Formation (Cretaceous, Cenomanian to Aptian)—NR; p. 24

Kfm Fortress Mountain Formation (Cretaceous, Albian)—NR; p. 25

Okpikruak and Kongakut Formations (Lower Cretaceous)—Includes the following units:

Kof Okpikruak Formation and similar units (Lower Cretaceous)—NR; p. 25

Kgk Kongakut Formation (Lower Cretaceous, Hauterivian and younger)—NR; p. 26

Pedmar Formation (Lower Cretaceous, Albian)—AP; p. 26

Pelitic schist (Late Cretaceous)—SC; p. 111

Kingak Shale, Shublik Formation, and Karen Creek Sandstone, undivided (Lower 

Cretaceous to Permian)—Includes the following units:

KPu Kingak Shale, Shublik Formation, and Karen Creek Sandstone, undivided (Lower 

Cretaceous to Permian)—NE; p. 33

KJks Kingak Shale and similar units (Lower Cretaceous to Lower Jurassic)—NR; 

p. 34

Kit Tingmerkpuk Member of the Ipewik Formation (Lower Cretaceous, 

Valanginian)—NW; p. 34

kc Karen Creek Sandstone (Upper Triassic)—NR; p. 34

Mafic and ultramafic rocks in southern Alaska (Cretaceous to late Paleozoic)—Includes the 

following units:

Kgb Gabbro and diorite of southeast Alaska (Cretaceous)—SE; p. 98

KJmu Mafic and ultramafic rocks (Cretaceous to Jurassic or older)—SC, SE, SW; 

p. 98

Kum Dunite and serpentinite, undivided (Cretaceous? to Paleozoic)—EC, SC, SE; 

p. 99

Kum Ultramafic rocks of southeast Alaska (Early Cretaceous)—SE; p. 99

KJdg Diorite and gabbro of southeast Alaska (Cretaceous? and Jurassic)—SE; p. 100

Jum Gabbronorite and other mafic and ultramafic rocks of Hidden terrane (Early 

Jurassic)—SC, SW; p. 103

gb Gabbro and quartz gabbro (Late Triassic?)—SC; p. 106

um Mafic and ultramafic rocks in the vicinity of the Denali Fault System 

(Triassic?)—SE; p. 106

dg Mafic igneous rocks of Duke Island (Middle Triassic)—SE; p. 106

gb Gabbro and orthogneiss (late Paleozoic)—SC; p. 106

Schrader Bluff Formation (Upper Cretaceous, Maastrichtian to Santonian)—NR; p. 19

Seabee Formation and Hue Shale (Upper Cretaceous, Coniacian to Turonian)—NR; p. 23

Foliated granitic rocks of southeast Alaska (middle Cretaceous?)—SE; p. 97

Shallow to moderate depth sedimentary rocks (Upper Cretaceous to upper Lower 

Cretaceous)—Includes the following units:

Kkn Nearshore facies (Kuskokwim Group) (Upper Cretaceous, Santonian to 

Cenomanian)—SW; p. 20

Km Matanuska Formation and correlative rocks (Upper Cretaceous to upper Lower 

Cretaceous )—SC; p. 21

Kelp Bay Group, undivided (Cretaceous to Triassic)—SE; p. 137. Includes the following 

units:

Kkbm Khaz Complex (Cretaceous and older)—SE; p. 137

Jpp Pinnacle Peak Phyllite (Jurassic or Triassic?)—SE; p. 137

Volcanic and sedimentary rocks of southwest Alaska (Cretaceous to Triassic?)—SW; 

p. 28. Includes the following units:

Ks Restricted Gemuk Group (Lower Cretaceous to Triassic?)—SW; p. 29

Jvs Marine volcaniclastic and arkosic sandstone (Jurassic)—SW; p. 29

Jvc Volcaniclastic and volcanic rocks (Upper and Middle Jurassic)—SW; p. 35

Jvs Coarse volcaniclastic sedimentary rocks (Jurassic and (or) Triassic)—SW; p. 29

Jms Micaceous graywacke (Lower Jurassic)—SW; p. 41

Jp Phyllite and chert (Lower Jurassic to Upper Triassic)—SW; p. 41

Jls Limestone, shale, and chert (Lower Jurassic and Upper Triassic, Norian)—SW; 

p. 41

Volcanic graywacke and conglomerate (Lower Cretaceous, Hauterivian and older)—SW; 

p. 34

Volcanic rocks, undivided (Cretaceous)—EC, NW, SC, SE, SW; p. 82

Volcanic graywacke and mudstone (Lower Cretaceous)—WC; p. 26

Endicott Group, undivided (Mississippian to Devonian)—NR; p. 53. Includes the following 

units:

Mek Kekiktuk Conglomerate (Mississippian)—NE, NR; p. 53

Meks Kapaloak sequence of Moore and others (2002) (Mississippian)—NW; p. 54

Mes Kurupa Sandstone (Lower Mississippian)—NR; p. 54

Du Mangaqtaaq formation of Anderson and Watts (1992) and Ulungarat formation of 

Anderson (1993) (Upper Devonian)—NE; p. 55

Kanayut Conglomerate and Noatak Sandstone, undivided (Endicott Group) (Lower 

Mississippian and Upper Devonian)—NR; p. 54

Iyoukeen and Peratrovich Formations (Mississippian and Devonian)—SE; p. 52

Granitic rocks and orthogneiss (Mississippian to Devonian)—Includes the following units:

MDgi Old Crow suite of Gordey and Makepeace (2003) and other granitic rocks of 

northeast Alaska (Mississippian to Devonian?)—NE; p. 107

MDag Augen gneiss and orthogneiss (Early Mississippian and Late Devonian)—EC, 

WC; p. 121

Dmi Metamorphosed mafic igneous rocks (Late Devonian)—CN; p. 122

Dogn Granitic gneiss (Late and Middle Devonian)—NR, SP; p. 123

Totatlanika Schist (Yukon-Tanana crystalline complex) (Early Mississippian to Late 

Devonian)—EC, SC; p. 116

Greenstone and schist (Togiak-Tikchik Complex) (Mississippian? and Devonian?)—SW; 

p. 135

Globe quartzite of Weber and others (1992) (Mississippian)—CN; p. 52

Kayak Shale (Endicott Group) (Mississippian)—NR; p. 53

Akmalik Chert and other black chert of the Lisburne Group (Mississippian)—NE, NW; 

p. 51

Kuna Formation (Lisburne Group) (Mississippian)—NW; p. 50

Nasorak and Utukok Formations (Lisburne Group) (Mississippian)—NW; p. 51

Kaskawulsh group of Kindle (1953) (Mississippian and older)—SC; p. 121

Gneiss, schist, and amphibolite (Yukon-Tanana crystalline complex) (Mississippian, 

Devonian, and older)—Includes the following units:

ymi Orthogneiss and amphibolite of igneous origin (Mississippian, Devonian, and 

older?)—EC; p. 116

ygs Gneiss, schist, and quartzite (Mississippian, Devonian, and older)—EC; p. 116

Mélanges (Mesozoic to Paleozoic)—Includes the following units:

KJmy Mélange of the Yakutat Group (Cretaceous and Jurassic?)—SC, SE; p. 132

Kmar Alaska Range mélange (Cretaceous)—SC; p. 132

m Southwest Alaska mélange (Mesozoic and Paleozoic)—SW; p. 133

Metamorphic rocks of Admiralty Island, undivided (Mesozoic to Paleozoic)—SE; p. 111

Metamorphic rocks associated with the Coast plutonic complex of Brew and Morrell 

(1979b) (Triassic to Paleozoic)—Includes the following units:

ss Metasedimentary and minor metavolcanic rocks along the west side of the Coast 

plutonic complex of Brew and Morrell (1979b) (Triassic to Paleozoic)—SE; 

p. 112

Pm Marble along the west side of the Coast plutonic complex of Brew and Morrell 

(1979b) (Permian? protolith)—SE; p. 113

sv Metavolcanic rocks west of the Coast plutonic complex of Brew and Morrell 

(1979b) (Triassic to Paleozoic)—SE; p. 113

gn Roof pendants of the Coast plutonic complex of Brew and Morrell (1979b) 

(Paleozoic)—SE; p. 120

ks Metamorphic rocks of the Kah Shakes sequence of Rubin and Saleeby (1991), 

undivided (early Paleozoic)—SE; p. 124

Kisaralik anticlinorium of Box and others (1993) (Togiak-Tikchik Complex) (Jurassic 

metamorphism, early Mesozoic or Paleozoic protolith)—SW; p. 135. Includes the 

following units:

gs Green amphibole-bearing schist (Jurassic metamorphism)—SW; p. 135

p Phyllite of the Kisaralik anticlinorium (early Mesozoic or Paleozoic)—SW; 

p. 136

sk Metasedimentary rocks of the Kisaralik anticlinorium (early Mesozoic or 

Paleozoic)—SW; p. 136

MDm Metabasalt and marble of the Kisaralik anticlinorium (Early Mississippian to Late 

Devonian)—SW; p. 136

Metabasite (Mesozoic and Paleozoic)—NR, SP, WC; p. 111

Chert of Interior Alaska (Ordovician)—CN; p. 71

Jones Ridge Limestone and related units (Ordovician to Cambrian)—EC, NE; p. 72

Fossil Creek Volcanics and similar rocks (Ordovician and Cambrian)—EC, NE, NR; 

p. 88

Older rocks of York terrane and Grantley Harbor Fault Zone (Middle Ordovician to 

Proterozoic)—SP; p. 68

Clastic and volcaniclastic rocks (Togiak-Tikchik Complex) (Permian)—SW; p. 134

Cannery Formation and Porcupine slate of Redman and others (1985), undivided 

(Permian to Devonian)—Includes the following units:

PDcf Cannery Formation and Porcupine slate of Redman and others (1985), undivided 

(Permian to Devonian)—SE; p. 48

ps Porcupine slate of Redman and others (1985) (late Paleozoic)—SE; p. 120

Sedimentary rocks of the Mystic structural complex (Permian to Devonian)—Includes the 

following units:

PDsc Sheep Creek formation of Bundtzen and others (1997a) and correlative siliciclastic units of the Mystic structural complex (Permian to Devonian)—SC, SW, 

WC; p. 38

Dls Limestone of the Mystic structural complex (Devonian)—SW, WC; p. 38

Limestone and calcareous clastic rocks (Permian)—Includes the following units:

Pls Limestone (Permian)—AP; p. 47

Plps Pybus Formation and correlative? limestone (Permian)—SE; p. 47

Ph Halleck Formation and similar sedimentary rock units (Permian)—SE; p. 47

Ptl Tahkandit Limestone (lower Permian)—EC, NE; p. 48

Ptls Limestone of southwest Alaska (Togiak-Tikchik Complex) (Permian)—SW; 

p. 135

Granodiorite, syenite, and other granitic rocks (early Permian and Pennsylvanian)—SC, 

SE; p. 107

Strelna Metamorphics and related rocks (early Permian to Middle Pennsylvanian)—SC; 

p. 119

Step Conglomerate (lower Permian)—EC; p. 48

Andesite and basalt of southern Alaska (early Permian)—Includes the following units:

Pv Volcanic rocks of Puale Bay (early Permian)—AP; p. 86

Phb Volcanic rocks of the Halleck Formation and related rocks of southeast Alaska 

(early Permian)—SE; p. 86

Calico Bluff and Ford Lake Shale, undivided (Lower Pennsylvanian to Devonian)—EC; 

p. 52

Nuka Formation (Carboniferous)—NW; p. 49

Upper Saginaw Bay Formation and similar rocks of southeast Alaska 

(Pennsylvanian)—SE; p. 49

Marble (early Permian to early Paleozoic)—Includes the following units:

ce Marble, southeast Alaska (early Permian to Devonian)—SE; p. 120

cn Marble, northern Alaska (early Paleozoic)—NW; p. 121

m Marble of the Brooks Range (Devonian and older)—NR; p. 124

Black chert (lower Paleozoic, Devonian or older)—SW; p. 55

Eclogite and associated rocks (Yukon-Tanana crystalline complex) (Paleozoic)—CN; 

p. 115

Klondike Schist, Keevy Peak Formation, and similar rocks (Yukon-Tanana crystalline 

complex) (Permian to early Paleozoic)—Includes the following units:

Pks Klondike Schist (Permian)—EC; p. 115

kp Keevy Peak Formation and similar rocks (early Paleozoic )—CN, EC; p. 117

Limestone and marble (Paleozoic)—EC, NR, WC; p. 47

Metagabbro and metasedimentary rocks (Nome Complex) (Paleozoic?)—SP; p. 140

Gabbro and metagabbro (early Paleozoic and Proterozoic?)—SP; p. 129

High-grade metamorphic rocks of the Seward Peninsula (earliest Paleozoic to 

Proterozoic)—SP; p. 129

Nome Complex, undivided (early Paleozoic to Proterozoic)—SP; p. 139

Pelitic and quartzitic schist of the Ruby terrane (early Paleozoic to Proterozoic?)—NR, 

WC; p. 127

Layered sequence (Nome Complex) (Devonian to Neoproterozoic)—Includes the following 

units:

ncs Younger schist (Devonian and Silurian?)—SP; p. 140

DOnx Marble, graphitic rocks, and schist (Devonian to Ordovician?)—SP; p. 140

Ocs Casadepaga Schist (Ordovician)—SP; p. 141

Onim Impure marble (Ordovician)—SP; p. 141

Zngn Metagranitic rocks (Neoproterozoic)—SP; p. 142

Katakturuk Dolomite (Proterozoic)—NE; p. 74

Basement of the White Mountain sequence (Proterozoic)—Includes the following units:

qm Schist of the Telsitna River (Proterozoic)—WC; p. 131

m Marble, calcareous and quartz-mica schist, and greenstone (Proterozoic?)—WC; 

p. 131

Basalt and red beds member (Tindir Group) and Mount Copleston volcanic rocks of 

Moore (1987) (Proterozoic)—Includes the following units:

tnm Basalt and red beds member (Tindir Group) (Proterozoic)—EC, NE; p. 88

v Mount Copleston volcanic rocks of Moore (1987) (Proterozoic)—NE; p. 89

Yakataga and Tugidak Formations (Quaternary and uppermost Tertiary)—SO; p. 5

Contact metamorphosed and hydrothermally altered rocks (Quaternary or late 

Tertiary)—AL, AP; p. 109

Unconsolidated and poorly consolidated surficial deposits (Quaternary and uppermost 

Tertiary)—Includes the following units:

Qs Unconsolidated surficial deposits, undivided (Quaternary)—ST; p. 5

QTs Poorly consolidated surficial deposits (Quaternary, Pleistocene, and uppermost 

Tertiary)—AL, AP, SW, WC; p. 5

Young volcanic and shallow intrusive rocks (Quaternary or late Tertiary)—Includes the 

following units:

Qv Youngest volcanic rocks (Quaternary and latest Tertiary?)—AL, AP, EC, SC, SE, 

SW, WC; p. 75

QTv Young volcanic rocks, undifferentiated (Quaternary or Tertiary)—AL, AP, EC, 

SP, SW, WC; p. 75

QTi Young shallow intrusive rocks (Quaternary or late Tertiary)—AL, AP, SC, SE; 

p. 89

Kiska Harbor and Milky River Formations (Quaternary? and late Tertiary)—AL, AP; 

p. 76

Older rock units of the Doonerak Window (Silurian to Cambrian)—Includes the following 

units:

Ss Sedimentary rocks of Doonerak Window (Silurian to Cambrian)—NR; p. 69

Odv Oldest volcanic rocks (Ordovician and Cambrian?)—NR; p. 69

Farewell basinal facies clastic rocks (Silurian to upper Cambrian)—Includes the following 

units:

Stc Terra Cotta Mountains Sandstone (Silurian)—WC; p. 60

Spl Post River Formation and correlative units (Middle Silurian, Wenlock, to upper 

Cambrian)—SW; p. 60

Iviagik group of Martin (1970) (Silurian, Llandovery, to Ordovician)—NW; p. 70

Heterogeneous metamorphic rocks, southeast Alaska (Silurian and Ordovician)—SE; 

p. 127

Sedimentary and volcanic rocks of Prince of Wales Island (Silurian, Llandovery, and 

Ordovician)—Includes the following units:

SOd Descon Formation and other sedimentary and volcanic rocks of Prince of Wales 

Island (Silurian, Llandovery, and Ordovician)—SE; p. 70

SOdc Associated carbonate rocks (Silurian, Llandovery, and Ordovician)—SE; p. 71

SOv Associated volcanic rocks (Silurian, Llandovery, and Ordovician)—SE; p. 71

Four Winds complex of Gilbert and others (1987), Retreat Group, and orthogneiss 

(Silurian to Proterozoic)—Includes the following units:

SZfw Four Winds complex of Gilbert and others (1987) and similar rocks (Silurian to 

Neoproterozoic)—SE; p. 127

rg Retreat Group (Paleozoic and Proterozoic)—SE; p. 128

Zogn Orthogneiss (Cambrian to Neoproterozoic)—SE; p. 130

Basalt and keratophyre (Tertiary, Paleogene, or older)—AL; p. 79

Coal-bearing sedimentary rocks (Tertiary, Pliocene to Eocene?)—CN, SO; p. 8

Gneiss and amphibolite (Tertiary, Miocene)—EC, SC; p. 109

Copper Lake Formation (Tertiary, Eocene to Paleocene)—AP; p. 15

Younger phase, Coast plutonic complex of Brew and Morrell (1979b) (Tertiary, 

Eocene)—SE; p. 91

Porphyritic granodiorite phase of Coast plutonic complex of Brew and Morrell (1979b) 

(Tertiary, Eocene)—SE; p. 92

Felsic dikes, sills, and small stocks in southern Alaska (Tertiary and older?)—Includes the 

following units:

Tephi Felsic hypabyssal intrusions (Tertiary, Eocene)—SC; p. 93

Tehi Felsic dikes, sills, and small stocks in southern Alaska (Tertiary and older?)—SC; 

p. 93

Gabbroic rocks in southern Alaska (Tertiary)—Includes the following units:

Tgbe Younger gabbro of southeast Alaska (Tertiary, Miocene to Eocene)—SE; p. 89

Tgba Diabase and gabbro, Aleutian Islands (Tertiary, Miocene to Paleocene?)—AL, 

AP; p. 90

Tgbw Gabbro, southwest Alaska (Tertiary, Paleogene?)—SC, SW; p. 90

Hypabyssal intrusions (Tertiary)—AL, AP, CN, SO; p. 79

Kootznahoo Formation (Tertiary, lower Miocene to upper Eocene)—SE; p. 10

Canning Formation (lower Tertiary, Oligocene? to Cretaceous, Albian)—NE; p. 15

Granitic rocks of southern and interior Alaska (Tertiary, Paleocene, to Cretaceous, 

Maastrichtian)—Includes the following units:

Tpgr Undivided granitic rocks (Tertiary, late Paleocene)—SC, SO, SW; p. 94

Tpg Peralkaline granite (Tertiary, Paleocene?)—SW; p. 94

TKg Felsic granitic rocks (Tertiary, Paleocene, or Late Cretaceous, 

Maastrichtian)—EC, SC, SO, SW; p. 94

TKgd Granodiorite to quartz monzodiorite (Tertiary, Paleocene, or Late Cretaceous, 

Maastrichtian)—EC, SC, SW; p. 95

Ghost Rocks Formation and similar rocks (Tertiary, Paleocene, and Upper 

Cretaceous)—Includes the following units:

TKm Ghost Rocks Formation (early Tertiary and latest Cretaceous)—AP; p. 132

TKgrs Ghost Rocks sedimentary rocks (Tertiary, Paleocene, and Upper 

Cretaceous)—SW; p. 16

Kcv Chert and volcanic sequence (Upper Cretaceous)—AP; p. 19

Krugoli Formation, undifferentiated (Tertiary, Paleogene, or Cretaceous)—AL; p. 13

Mafic intrusive rocks (Tertiary to Late Cretaceous or older)—Includes the following units:

TKgb Gabbroic rocks (Tertiary to Late Cretaceous or older)—SC, SW, WC; p. 95

TKpd Peridotite (Tertiary, Paleocene, or older)—SW; p. 95

Nearshore and nonmarine sedimentary rocks in southern Alaska (Tertiary)—Includes the 

following units:

Tkn Kenai Group, undivided (Tertiary, Miocene to Oligocene)—AP, SC; p. 6

Tts Tsadaka Formation (Tertiary, Oligocene)—SC; p. 10

Ttk Nearshore and nonmarine sedimentary rocks (Tertiary, Eocene to 

Paleocene)—AP, SC, SO, SW; p. 11

Prince Creek Formation (lower Tertiary, Paleocene, to Upper Cretaceous, 

Campanian)—NR; p. 15

Flows and pyroclastic rocks (early Tertiary to Late Cretaceous)—Includes the following 

units:

TKv Volcanic rocks in southern Alaska (early Tertiary to Late Cretaceous)—NE, NW, 

SC, SW, WC; p. 80

Tpt Pyroclastic rocks (Tertiary, early Eocene or Paleocene)—EC, SE, SW, WC; 

p. 81

TKwt Welded tuff and other felsic volcanic rocks (early Tertiary and early Late 

Cretaceous)—EC; p. 82

Conglomerate, sandstone, and lignite (lower Tertiary to Upper Cretaceous)—CN, EC, SP; 

p. 13

Foliated tonalite sill and pegmatite, Coast plutonic complex of Brew and Morrell (1979b) 

(Tertiary, Eocene? to latest Cretaceous)—Includes the following units:

TKts Foliated tonalite sill of Coast plutonic complex of Brew and Morrell (1979b) 

(Tertiary, Paleocene, and latest Cretaceous)—SE; p. 92

TKpeg Trondhjemitic pegmatite (Tertiary, Eocene? or older)—SE; p. 94

Younger granitic rocks (Tertiary, Pliocene to Miocene)—AL, AP, SE; p. 89

MacLaren metamorphic belt of Smith and Lanphere (1971) (Tertiary to Jurassic or 

older?)—Includes the following units:

TKgg Gneissose granitic rocks (Tertiary or Late Cretaceous)—SC; p. 109

mu Metamorphic rocks of the MacLaren metamorphic belt of Smith and Lanphere 

(1971) (Cretaceous and Jurassic or older?)—SC; p. 110

Basement rocks, undifferentiated, Aleutian Islands (Tertiary or older)—AL; p. 14

Nenana Gravel (Tertiary, Pliocene and upper Miocene)—SC; p. 6

Granitic rocks in southern Alaska (Tertiary, Oligocene and Eocene)—Includes the following units:

Tgw Granite, southwest Alaska and Aleutian Islands (Tertiary, Oligocene, or 

older)—AL, AP, SW; p. 90

Togr Granite and granodiorite (Tertiary, Oligocene)—SC, SE, SW; p. 90

Tod Granodiorite, quartz diorite, and diorite (Tertiary, Oligocene and late 

Eocene)—AP, SC, SE; p. 91

Toegr Granitic rocks (Tertiary, early Oligocene and Eocene)—SC, SE, SW; p. 91

Mafic and ultramafic rocks of the Valdez and Orca Groups (Tertiary, Eocene to 

Paleocene)—SC; p. 92

Volcanic rocks of the Orca Group and Ghost Rocks Formation (Tertiary, Eocene to 

Paleocene)—AP, SC; p. 80

Redwood and Poul Creek Formations (Tertiary, Miocene to Eocene?)—SC; p. 7

Sedimentary and volcanic rocks of the Orca Group, undivided (Tertiary, Eocene to 

Paleocene)—SC; p 14; Includes the following unit:

Tos Sedimentary rocks of the Orca Group (Tertiary, Eocene to Paleocene)—SC; p. 14

Granitic intrusive rocks of the Chugach accretionary complex (Tertiary, Paleocene)—SC, 

SW; p. 93

Undivided dikes and sills (Tertiary to Paleozoic?)—Includes the following units:

TKhi Dikes and subvolcanic rocks (Tertiary and (or) Cretaceous)—SW, WC; p. 95

i Undivided dikes and sills, south-central Alaska (Mesozoic or Paleozoic )—SC; 

p. 96

Sagavanirktok Formation (Tertiary, Miocene to Paleocene)—NR; p. 7

Sitkinak and Sitkalidak Formations (Tertiary, Oligocene to Eocene)—Includes the following units:

Tsk Sitkinak Formation (Tertiary, Oligocene)—SW; p. 12

Tsi Sitkalidak Formation (Tertiary, Oligocene to Eocene)—SW; p. 12

Sedimentary rocks of southwest Alaska (Tertiary, Miocene and Oligocene)—Includes the 

following units:

Tms Tachilni, Bear Lake, Chuniksak, Nevidiskov, and Chirikof Formations (Tertiary, 

Miocene and upper Oligocene)—AL, AP; p. 8

Tnc Narrow Cape and Topsy Formations (Tertiary, Miocene)—AP, SC; p. 9

Tuu Unga, Belkofski, and Unalaska Formations (Tertiary, Miocene)—AL, AP; p. 9

Tsti Siltstone of Trinity Islands (Tertiary, Miocene and Oligocene)—AP; p. 10

Sedimentary rocks, undivided (Tertiary)—ST; p. 6

Sedimentary rocks of eastern Prince William Sound (Tertiary, Eocene)—Includes the 

following units:

Tes Tokun and Stillwater Formations and similar rocks (Tertiary, Eocene)—SC; p. 12

Tkf Kulthieth Formation (Tertiary, Eocene)—SC, SE; p. 13

Volcanic rocks, undivided (Tertiary)—Includes the following units:

Tvu Volcanic rocks of southern Alaska (Tertiary, Pliocene? and older)—AL, AP, CN, 

EC, SC, SW; p. 76

Twv Wrangell Lava (Tertiary, Pliocene to Oligocene)—EC, SC; p. 77

Tepv Andesite and basalt flows (Tertiary, Eocene and Paleocene)—SC, WC; p. 80

Tpcv Cantwell Formation, volcanic rocks subunit (Tertiary, Paleocene)—SC; p. 82

Tsr Soda rhyolite and basalt (Tertiary, Paleocene)—NW; p. 82

Victoria Creek metamorphic rocks (Tertiary, Paleocene metamorphism)—CN; p. 110

Volcanic and sedimentary rocks (Tertiary, Oligocene and Eocene)—Includes the following 

units:

Tarcs Volcaniclastic sedimentary rocks (Tertiary, Oligocene to Eocene)—AL, AP; p. 10

Tvs Volcanic and sedimentary rocks, undivided (Tertiary, Oligocene and 

Eocene)—SC; p. 11

Older volcanic rocks, undivided (Tertiary, early Miocene to Eocene)—Includes the following units:

Tca Admiralty Island and Cenotaph Volcanics (Tertiary, Miocene to Oligocene)—SE; 

p. 78

Tmv Meshik Volcanics and similar rock units (Tertiary, Oligocene to Eocene)—AL, 

AP, SC, WC; p. 78

Tev Felsic volcanic rocks of southwest Alaska (Tertiary, Oligocene? and 

Eocene)—SW; p. 79

Younger volcanic rocks, undivided (Tertiary, Pliocene and Miocene)—Includes the following units:

Tpv Basalt and tuff (Tertiary, Pliocene)—SW; p. 77

Tvm Volcanic rocks of the Aleutian Islands and Alaska Peninsula (Tertiary, 

Miocene)—AL, AP, SW; p. 77

Tob Olivine basalt flows (Tertiary, Miocene)—EC; p. 78

Calcareous sedimentary rocks (Upper Triassic, middle? Norian and upper Carnian)—SC; 

p. 44

Sedimentary rocks and chert (Angayucham) (Triassic to Devonian)—Includes the following 

units:

Dtz Sedimentary rocks (Triassic to Devonian)—EC, NE, NR, SW, WC; p. 32

Mch Chert (Carboniferous and older)—WC; p. 32

Shublik Formation and lower Glenn Shale (Triassic)—Includes the following units:

gs Shublik Formation (Triassic )—NR; p. 34

gsl Glenn Shale, lower unit (Triassic)—EC; p. 42

Hyd Group, undivided (Upper and Middle Triassic)—SE; p. 43. Includes the following 

units:

hgs Hyd Group sedimentary rocks, undivided (Upper Triassic)—SE; p. 43

hgv Hyd Group igneous rocks, undivided (Upper Triassic)—SE; p. 44

Massive basalt and greenstone (Triassic)—Includes the following units:

vs Volcanic and sedimentary rocks of Nakwasina Sound (Triassic)—SE; p. 85

b Mafic volcanic rocks of Chilkat Peninsula (Late Triassic)—SE; p. 85

n Nikolai and Goon Dip Greenstones and equivalent rocks (Late and Middle 

Triassic)—SC, SE; p. 86

cb Cottonwood Bay and Chilikradrotna Greenstones (Late Triassic, Norian?)—AP, 

SW; p. 86

vsw Older volcanic rocks of southwest Alaska (Triassic)—SW; p. 86

Marble and limestone of Wrangellia (Triassic)—Includes the following units:

ls Carbonates and associated rocks (Triassic)—SW; p. 45

cnk Chitistone and Nizina Limestones and Kamishak Formation (Upper Triassic, 

Norian to Carnian)—AP, SC, SW; p. 45

wm Whitestripe Marble of southeast Alaska (Triassic?)—SE; p. 45

Seventymile assemblage (Yukon-Tanana crystalline complex) (Triassic to 

Mississippian)—EC; p. 115

Sadlerochit Group, undivided (Lower Triassic to Permian)—NE; p. 46. Includes the 

following units:

if Ivishak Formation (Lower Triassic)—NE; p. 46

Pe Echooka Formation (Permian)—NE; p. 46

Metamorphic rocks, southeast Alaska (Triassic to Permian)—SE; p. 114

Skolai and Mankomen Groups, undivided (Triassic to Pennsylvanian)—Includes the 

following units:

Pms Mankomen and Skolai Groups, undivided (lower Permian and 

Pennsylvanian)—SC; p. 48

Peh Eagle Creek and Hasen Creek Formations (lower Permian)—SC; p. 48

Pehls Limestone of the Hasen Creek and Eagle Creek Formations (lower 

Permian)—SC; p. 49

Pt Slana Spur and Station Creek Formations and Tetelna Volcanics (lower Permian 

to Middle Pennsylvanian)—SC; p. 49

ms Metavolcanic and metasedimentary rocks (Late Triassic)—SC; p. 118

Flysch-like sedimentary rocks (Triassic to Pennsylvanian)—SC; p. 42

Metamorphic rocks of Baranof Island (Triassic or older)—SE; p. 118

Metagraywacke and phyllite (Triassic? and late Paleozoic)—CN, NR, WC; p. 119

Quartz diorite and granodiorite (Triassic)—EC, SE, SW; p. 104

Shuyak Formation, undivided (Upper Triassic)—Includes the following units:

sy Sedimentary member (Upper Triassic)—AP; p. 42

syv Volcanic member (Upper Triassic)—AP; p. 42

Kanektok metamorphic complex and Idono Complex (Paleoproterozoic)—SW; p. 131. 

Includes the following unit:

km Kanektok marble (Precambrian)—SW; p. 132

Metasedimentary and metavolcanic rocks of Mount Angayukaqsraq 

(Neoproterozoic)—NW; p. 130

Gneiss of northern Alaska (Neoproterozoic)—Includes the following units:

Zgn Granite and orthogneiss (Neoproterozoic?)—NR; p. 130

Zgns Orthogneiss of the Seward Peninsula (Neoproterozoic)—SP; p. 130

EXPLANATION OF MAP SYMBOLS

[Some symbols on printed or plotted maps are too short or too small to clearly identify. All symbols are 

attributed in the database]

Faults—See database for more information on fault movement 

Fault—Solid where location is certain, approximate, or inferred; dotted where concealed

Thrust fault—Solid where location is certain, approximate, or inferred; dotted where 

concealed. Sawteeth on upper plate

High-angle thrust fault—Solid where location is certain, approximate, or inferred; dotted 

where concealed. Sawteeth on upper plate

Caldera or crater rim—Solid where location is certain; dotted where concealed

Glacier

Road

City or town

ALASKA

MAP LOCATION

CANADA

RUSSIA

OCEAN

PA C I F I C

NORTH AMERICAN VERTICAL DATUM OF 1988

50 0 50 100 150 MILES

50 0 50 100 150 KILOMETERS

See Guide to the Digital Database Files (readme file), SCALE 1:1 584 000

Spatial Datasets section, for geographic sources

No suitable topographic base is available or could be 

created within the scope of this project. Shaded-relief 

bases were not appropriate, because they obscured the 

geologic mapping

Alaska Albers Equal Area projection; North American 

Datum 1983 (NAD–83)

Detailed mapping credit is in nsarefs in database

Digital database by F.H. Wilson, Nora Shew, Keith Labay, 

and C.P. Hults

Cartographic design by Keith Labay

Digital cartographic production by Kathryn Nimz

Edited by C.M. Landowski and J.L. Zigler

Manuscript approved for publication August 13, 2015

130°00'

54°00'

134°00'

54°00'

56°00'

136°00'

56°00'

138°30'

58°00'

130°00'

57°00'

132°00'

60°00'

58°00'

138°00'

61°00'

141°00'

147°00'

141°00'

71°00'

147°00'

69°00'

67°00'

65°00'

63°00'

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3340

Sheet 2 of 2

Pamphlet accompanies map