Imuruk

Lake

Imuruk

Basin

Grantley Harbor

K O T Z E B U E S O U N D

NORTON SOUND

N O R T O N

B A Y

Salmon

Lake

Killeak

Lakes

Devil

Mountain

Whitefish Lakes

Lake

Sinuk River

Fish River

Koyuk River

Nugnugaluktuk River

Goodhope

River

Serpentine River

Kuzitrin River

A

giapuk River

Koug

arok River

Noxapaga River

Kuzitrin River

BERING STRAIT

Mint River

Kugrupaga River

Nome River

Pilgrim River

Eldorado River

Pargon

River

Tubutulik

River

Inmachuck

River

Kugruk River

Kiwalik

River

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Nome

Cape Espenberg

Nome-Council

Road

Nome-Tell e r Road

Nome-Taylor Road

King Island

Sledge Island

Fairway 

Rock

Little 

Diomede

Island

Cape Deceit

Cape Nome

168°00'

65°00'

66°00'

165°00'

165°00'

162°00'

162°00'

66°00'

65°00'

168°00'

Printed on recycled paper

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LIST OF MAP UNITS

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

are too small to distinguish the color for unit identification. These units are labeled where possible, and 

unlabeled units are attributed in the database.]

SURFICIAL DEPOSITS

Surficial deposits, undivided (Quaternary)

MESOZOIC AND CENOZOIC IGNEOUS ROCKS

Lost Jim Basalt (Holocene)

Weathered volcanic rocks, undivided (Quaternary and Tertiary)

Felsic volcanic rocks (Tertiary and Cretaceous)

Tin-bearing granitic stocks (Late Cretaceous)

Dikes and stocks (Cretaceous)

Pargon pluton (Cretaceous)

Kigluaik diorite (Cretaceous)

Kigluaik granite (Cretaceous)

Stocks, undifferentiated (Cretaceous)

Kugruk pluton (Cretaceous)

Windy Creek pluton (Cretaceous)

Darby pluton (Cretaceous)

Diorite (Cretaceous)

Granodiorite (Cretaceous)

Monzonite-syenite (Cretaceous)

Gneissic monzonite (Cretaceous)

Bendeleben and Kuzitrin plutons (Cretaceous)

Dry Canyon stock (Early Cretaceous)

Granite and granodiorite (Early Cretaceous)

Syenite, monzonite, and nepheline syenite (Early Cretaceous)

Andesite and basalt flows and volcaniclastic rocks (Early Cretaceous)

Granitic rocks, undifferentiated (Cretaceous)

YORK TERRANE

YORK MOUNTAINS SUCCESSION

Limestone (Devonian and (or) Silurian)

Dark limestone (Silurian and Upper Ordovician)

Limestone and dolostone, undifferentiated (Silurian and Ordovician)

Limestone and shale (Ordovician)

Limestone (Ordovician)

Argillaceous limestone and limestone (Ordovician)

UNITS WITH UNCERTAIN AFFINITIES

Limestone (Paleozoic)

Limestone, dolomitic limestone, and marble (Mississippian)

Metagabbro (Paleozoic)

Limestone and dolomitic limestone (Ordovician to Proterozoic)

Sandstone, siltstone, and limestone (Ordovician to Proterozoic)

Phyllite (Ordovician to Proterozoic)

GRANTLEY HARBOR FAULT ZONE

Phyllite and argillite (Paleozoic)

Metalimestone (Paleozoic and Proterozoic?)

Metasiltstone and phyllite (Paleozoic and Proterozoic?)

NOME COMPLEX

LAYERED SEQUENCE AND RELATED ROCKS

Metagabbro and metasediments (Paleozoic?)

Pelitic schist (Devonian?)

Pelitic, calcareous, and graphitic schist (Devonian)

Mixed marble, graphitic metasiliceous rock, and schist (Devonian to Ordovician)––Overlay 

pattern indicates area of a distinctive belt of dolostone and marble of Silurian-Devonian age

Granitic orthogneiss (Devonian)

Felsic schist (Devonian)

Casadepaga Schist (Ordovician)

Impure chlorite marble (Ordovician)

Metagranitic rocks (Late Proterozoic)

SCATTERED METACARBONATE ROCKS

Marble, undivided (Paleozoic)

Dolostone, undivided (Paleozoic)

Marble of the Moon Mountains (Paleozoic)

Dolostone, metalimestone, and marble (Devonian)

Dolostone (Silurian)

Dolostone (Ordovician)

Dolostone (Cambrian)

METATURBIDITES

Black marble (Devonian to Cambrian)

Calcareous schist of Kwiniuk Mountain (Devonian to Cambrian)

Black metalimestone and marble (Devonian to Ordovician)

HIGH-GRADE METAMORPHIC AND ASSOCIATED IGNEOUS ROCKS

High-grade metasedimentary and metaigneous rocks (Paleozoic and Proterozoic)

Marble (Paleozoic and Proterozoic?)

Gneiss and orthogneiss (Paleozoic? and Proterozoic?)

Orthogneiss (Proterozoic)

Metavolcanic rocks (Proterozoic)

KUGRUK FAULT ZONE

Carbonate-rich conglomerate and sandstone; mudstone, siltstone and coal (Tertiary and 

Cretaceous)

Spruce Creek tonalite (Jurassic)

Metamorphosed mafic rocks and serpentinite (Mesozoic and Paleozoic?)

1:250,000-scale quadrangle boundary

Contact––Depositional, intrusive, or metamorphic

Fault––Dotted where concealed

Road

Bedrock Geologic Map of the Seward Peninsula, Alaska, and Accompanying Conodont Data

By

Alison B. Till1, Julie A. Dumoulin1, Melanie B. Werdon2, and Heather A. Bleick1

2011 1

U.S. Geological Survey, Anchorage, Alaska, 2Alaska Division of Geological and Geophysical Surveys, Fairbanks, Alaska

NATIONAL GEODETIC VERTICAL DATUM OF 1929

1 Sainsbury (1972);

 C.L. Sainsbury, unpub. data (1969)

2 J. Toro, written commun. (2006)

3 A.B. Till and others, unpub. mapping,

 (1985–1986, 2004–2007)

4 Amato and Miller (2004)

5 Bundtzen and others (1994)

6 Pollock (1982)

7 Sainsbury and others (1972)

8 Hannula (1993)

9 Begét and others (1996)

10 Till and others (1986)

11 Werdon and others (2005a);

 Werdon and others (2005b);

 Newberry and others (2005)

12 Patton and others (2005)

SHISHMAREF

INDEX MAP SHOWING SOURCES OF GEOLOGIC MAPPING

AND 1:250,000-SCALE QUADRANGLES

168° 165° 162° 159°67°

66°

65°

64°

SELAWIK

12

KOTZEBUE

9 & 10

SHISHMAREF

CANDLE

12

BENDELEBEN

10 & 11

TELLER

1, 2 & 3

NOME

3, 4, 5, 6, 7 & 8

SOLOMON

3, 10 & 11

NORTON BAY

12

Shaded relief from National Elevation Dataset (NED) 42.7-meter Digital Elevation 

Models (DEMs)

Universal Transverse Mercator Zone 3N; 1927 North American Datum

Base layer for water from 1:250,000 quadrangles (1950-1955) and National 

Hydrography Dataset

Geology compiled by Alison B. Till (2008)

GIS database and digital cartography by Keith A. Labay 

and Heather A. Bleick

Edited by Theresa Iki

Cartography by Darlene A. Ryan

Manuscript approved for publication July 14, 2010

?

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*

* +

+

+

+

*

*

**

*

* *

* * *

*

*

*

*

*

(

*)

(

*)

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×

×

× ×

×

×

×

+

(×)

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 3131

Sheet 1 of 2

Pamphlet accompanies map

SURFICIAL

DEPOSITS MESOZOIC AND CENOZOIC IGNEOUS ROCKS

CORRELATION OF MAP UNITS

YORK TERRANE

GRANTLEY HARBOR

FAULT ZONE NOME COMPLEX

HIGH-GRADE METAMORPHIC

AND ASSOCIATED

IGNEOUS ROCKS

KUGRUK

FAULT ZONE

LAYERED SEQUENCE

AND RELATED ROCKS

SCATTERED

METACARBONATE

ROCKS METATURBIDITES

UNITS WITH

UNCERTAIN AFFINITIES

YORK MOUNTAINS

SUCCESSION

* Conodont and (or) other phosphatic microfossil 

age, generally constrained within one or two stages. 

See Description of Map Units for precise age.

(

*) Problematic fossil age. See descriptions and (or) 

fossil table A-1 for discussion.

Virgilian Missourian

Desmoinesian

Atokan

Morrowan

Chesterian

Meramecian

Osagean

Kinderhookian

Famennian

Frasnian

Givetian

Eifelian

Emsian

Pragian

Tremadoc

Arenig

Llanvirn

Caradoc

Ashgill

Llandovery

Wenlock

Ludlow

Pridoli

Lochkovian

Upper

Middle

Middle

Middle

Lower

Upper

Upper

Lower

upper

Upper

Lower

lower

Lower

PENNSYLVANIAN

MISSISSIPPIAN

HOLOCENE

PLEISTOCENE

HOLOCENE

PLEISTOCENE

QUATERNARY

TERTIARY

CRETACEOUS

QUATERNARY

TERTIARY

CRETACEOUS

JURASSIC

TRIASSIC

PERMIAN

CARBONIFEROUS

DEVONIAN

SILURIAN

ORDOVICIAN

CAMBRIAN

CENOZOIC MESOZOIC CENOZOIC MESOZOIC PALEOZOIC

+ Graptolite age. × Megafossil age. × U-Pb zircon age. U-Pb zircon age and error. 

NEOPROTEROZOIC

PROTEROZOIC

* Less precise fossil age. 

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://pubs.usgs.gov/sim/3131