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21 2111

2236 24

7678 84

6756 51

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QUATERNARY

TERTIARY

CRETACEOUS

DEVONIAN

DEVONIAN ANDOLDER

Erosional contact

Intrusive contact

C O R R E L A T I O N O F M A P U N I T S

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Holocene

Pleistocene

LateCretaceous

EarlyCretaceous

Late and MiddleDevonian

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LIST OF MAP UNITS

QUATERNARY AND TERTIARY SURFICIAL DEPOSITS

Flood-plain deposits (Holocene)

Alluvial and fluvial deposits (Holocene)

Colluvium (Holocene)

Young alluvial fan deposits (Holocene)

Landslide deposits (Holocene)

Solifluction deposits (Holocene)

Debris flow deposits (Holocene)

Terrace deposits (Holocene and Pleistocene?)

Old alluvial fan deposits (Holocene and Pleistocene?)

Glacial moraine deposits (Holocene and Pleistocene?)

TERTIARY SEDIMENTARY ROCKS

Gravel-rich terrace deposits (post-Paleocene)

TERTIARY IGNEOUS ROCKS

Basalt dikes (Eocene?)

Rhyolite dikes (Tertiary)

Rhyolite (Paleocene)

CRETACEOUS IGNEOUS ROCKS

Pegmatitic dikes (Late Cretaceous?)

Biotite granite (Late Cretaceous?)

Quartz-feldspar porphyry (Late Cretaceous)

Granitoid dikes and plugs (Early Cretaceous)

Diorite dikes (Early Cretaceous)

Black Mountain intrusion (Early Cretaceous)

Goodpaster batholith (Early Cretaceous)

Main intrusive phase

Early intrusive phase

Granitic rocks of Mount Harper batholith (Early Cretaceous)

Granite of Tibbs Creek (Early Cretaceous)

Granodiorite of Brink intrusion (Early Cretaceous)

PALEOZOIC AND OLDER METAMORPHIC UNITS

Augen gneiss of Central Creek (Late and Middle Devonian)

Biotite orthogneiss (Late and Middle Devonian)

Amphibolite gneiss (Late Devonian and older)

Quartzite and metapelite (pre-Late Devonian)

Biotite±sillimanite gneiss (pre-Middle Devonian)

Biotite gneiss (pre-Late Devonian)

Contact—Dashed where inferred; dotted where concealed; queried where uncertain

Fault—Bar and ball on downthrown side where relative movement known. Dashed where inferred; dotted where concealed

Strike-slip fault—Dashed where inferred; dotted where concealed. In cross section, T indicates motion toward viewer; A, motion away from viewer

Thrust fault—Dotted where concealed

Antiform—Dotted where concealed

Synform—Dashed where inferred; dotted where concealed

Lineament—From analysis of aerial photographs

Shear zone

Minor fold—Showing strike and dip

Lineation—Showing strike and dip. May be combined with foliation symbols

Inclined

Horizontal

Foliation—Showing strike and dip. May be combined with lineation symbols

Inclined

Horizontal

Vertical

Joint—Showing strike and dip

Sample locality for U-Pb SHRIMP age date—See table 1

Placer mine or prospect—See table 2

Lode mine or prospect—See table 2

GEOLOGIC MAP OF THE BIG DELTA B-1 QUADRANGLE, EAST-CENTRAL ALASKABy

Warren C. Day, J. Michael O'Neill, John N. Aleinikoff, Gregory N. Green, Richard W. Saltus, and Larry P. Gough

See "Mapping Credits" in pamphlet.Manuscript approved for publication

June 5, 2007

Base from U.S. Geological Survey, 1958.Universal Transverse Mercator projection. 1927 North American Datum.10,000-foot grid based on Alaska coordinate system, zone 3.1,000-meter Universal Transverse Mercator grid ticks, zone 6.

Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological Survey

For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 802251-888-ASK-USGS

ARC/INFO coverages and a PDF for this map are available athttp://pubs.usgs.gov/

SCIENTIFIC INVESTIGATIONS MAP 2975Pamphlet accompanies map

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

Printed on recycled paper

APPROXIMATE MEANDECLINATION, 1958

1 7 KILOMETERS.5 0 1 2 3 4 5 6

SCALE 1:63 360

CONTOUR INTERVAL 100 FEET

NATIONAL GEODETIC VERTICAL DATUM OF 1929

1 5 MILES10 2 3 41/ 2

ALASKA

QUADRANGLE LOCATION

Prepared in cooperation with the

ALASKA DEPARTMENT OF NATURAL RESOURCES,DIVISION OF MINING, LAND, AND WATER

SERPENTINE

LAST CHANCE FAULT

6000FEET

SEA LEVEL

Selected Quaternary units omitted

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