U.S. Department of the Interior Scientific Investigations Map 3110

US. Geological Survey Pamphlet accompanies map
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Point Bede ¢ inl Ak Hydrologic base information derived from U.S. Geological Survey SCALE 1:350 000 Edited by Theresa Iki; digital cartographic production by
et . é : 1:63,360 scale DLG files . 7 Darlene A. Ryan
7 a F 10 oO 10 20 30 Miles
Shaded relief derived from USGS 2 arc second NED files ——— Manuscript approved for publication May 27, 2006
/ Alaska Albers Equal Area projection 10 0 10 20 30 40 50 Kilometers

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ph CORRELATION OF MAP UNITS LIST OF MAP UNITS GA Fit. creek sittstone (middte Bajocian) [ERG] Metavotcanic rocks, undivided
/
je UNCONSOLIDATED DEPOSITS UNCONSOLIDATED DEPOSITS (BA Gaikema Sandstone (lower middle Bajocian) Ley] Aquagene tuff
i tr a R 7 NEP dao | Holeceas att Modern tidal flat and estuarine deposits (Holocene) ie] Red Glacier Formation (lower middle Bajocian to lower Bajocian) [Iké ] Schist
i Qs Qsi | Qb | Qes }\ Qd’ |} Qadl, | Qgl | Qm~ rs = QUATERNARY . .. . .
ti rine . ) | *Qgn | Qgno | Qog “2090 | Qch Pleistocene Qs __| Unconsolidated surficial deposits, undivided (Quaternary) ee | Talkeetna Formation, undivided (Lower Jurassic) [Res] Gneiss
— ; . ROCK UNITS Alluvial and terrace deposits | Horn Mountain Tuff Member Mélange of Iceworm Peak of Kusky and others (1997)
= i Q : ROCK UNITS WEST OF THE BORDER RANGES FAULT SYSTEM WITHIN THE ROCK UNITS EAST OR SOUTH OF THE BORDER RANGES FAULT SYSTEM isandsitdeandcolinvial deposits | Portage Creek Agglomerate Member [kom] McHugh Complex, undivided (Cretaceous to Carboniferous, Mississippian)
‘ WSS BORDER
e “ RANGES Lacustrine, swamp, and fine silt deposits Lie] Marsh Creek Breccia Member [seins] McHugh Complex, graywacke and conglomerate (Lower Cretaceous to Lower Jurassic,
i 2 FAULT Pliensbachian)
HENNE Dy - BEDDED ROCKS IGNEOUS ROCKS ca BEDDED ROCKS IGNEOUS ROCKS a Beach deposits Lay Pogibshi formation of Kelley (1980), undivided (Lower Jurassic, Sinemurian to Hettan- (icine) McHidgh Complex; basaltand dhere (Lawer Cretaceous, Albian, to Middle Triasdis:
f ENT RA.Nee i ena Ann... Ae —_— gian and older?) Ladinian)
itis 2 ee & Holowene _Qes Estuarine deposits (ayy Port Graham formation of Kelley (1980) (Upper Triassic, Norian) er] Gabbro (Mesozoic)
Y ee Kenai Grou
é a : Pleist« QUORERNRS ~ Qd Eolian deposits . 4
ye leistocene Ps METAMORPHIC ROCKS ey Ultramafic plutonic rocks (Mesozoic)
‘adi | ji 7 Kakhonak Complex (Lower Jurassic to Permian? or older?
Pliocene |. Qdl_- Deltaic deposits (Prey plex ( ) IGNEOUS ROCKS
Alaska-Aleutian ; . ; . oe .
Range batholith Qgi_«| —Glaciolacustrine deposits IGNEOUS ROCKS bk | Dacite of Cape Saint Elias (Pliocene or Miocene)
“ S = rai . woe
_— Alf si Chugach Miocene Qm Glacial deposits, undivided 9 A Volcanic rocks, undivided (Quaternary) Be) Mafic plugs (Oligocene?)
- 7, National 7 . . i dt Debris-flow deposits (Holocene) we .
HILLS TYONEK / // Forest MCCARTHY Qag Drift of Neoglacial age (Holocene) ! ac Granitic rocks (Oligocene? and latest Eocene)
S oS 7 Ophiolitic rocks of Prince William Sound Oli TERTIARY [Peed] Andes it Plei
= L P Hgprene Qao Outwash of the Neoglacial age (Holocene) ndesite and dacite domes (Pleistocene) iL Gabbro and diorite (Oligocene and older)
\ 3 r
L fle iddle? to late? Terti
Lake 5 SOURCES OF GEOLOGIC MAPPING 8 Qgn_ Glacial deposits of the Naptowne and Brooks Lake Glaciations (Pleistocene) Dae ava Hows {middle?.to.lnte? Ternary) [tes Granite and granodiorite (Eocene)
Clark osene Granodiorite (Tertiary and (or) Cret:
National BERING KENAI QUADRANGLE Qgno Outwash and valley train deposits (Pleistocene) ranodiorite (Tertiary and (or) Cretaceous) ew] Granitic rocks of Harding Icefield region (Eocene and Paleocene)
Park & GLACIER . i => in| Quartz diorite (Cretaceous)
Preserve Bradley and Wilson, 2000 McHugh Complex (Tectonite) Paleocene | Gog. Older glacial deposits (Pleistocene) Ophiolitic rocks of Prince William Sound
~% Detterman and Hartsock, 1966 The 4 7 (oss" | juartz monzodiorite (Cretaceous? and (or) Jurassic?) i ivi
LAKE CLARK.@ - _ Karlstrom, 1964 Fed ‘Gogo Outwash associated with older glacial deposits (Pleistocene) Q ( (or) ) Volcanic rocks, undivided (Eocene)
ro Magoon and others, 1776 Upper © Qch Moraine of the Caribou Hills Glaciation (Pleistocene) ‘BMaska:eutian. Range bathollth (Jurassle phase) Be Billow basalt
Reed and others, 1983 as nT thiemit: te A
Reed and others, 1992 Alaska-Aleutian CRETACEOUS rondhjemite (Late Yarassic): Eres] Volcanic and sedimentary rocks
Icy Riehle and Emmel, 1980 Nain Range batholith Lower ROCK UNITS WEST OF THE BORDER RANGES FAULT SYSTEM HA uarts diorite, tonatite, and diorite (Jurassic) ,
\, Wayth d Miller, 1999 F ti Pra Sheeted basalt dikes
" BAY faythomas and Miller, ‘ormation 2 _ . .
Kenai ~BLYING SOUND MIDDLETON ISLAND Wilson, F.H., and Hults, C.P,, unpub. data, 2007 BEDDED ROCKS [PRADY artediorte and tonatte (Late Triasic) HE catiro
Fjords Wilson and others, 2006 tkn | Kenai Group, undivided (Pliocene to Oligocene)
National Usper ROCK UNITS WITHIN THE BORDER RANGES FAULT SYSTEM. mcrae Ultramafic rocks
Park SELDOVIA QUADRANGLE Chinitna PP\ Sterling Formation (Pliocene and Miocene)
Katmai Bradley, D.C., USGS, oral commun., June 7, 2007 Formation Tuxedni Group . . METAMORPHIC ROCKS Ping Mafic and ultramafic plutonic rocks (Eocene and Paleocene?)
National re Bradley and others, 1999 c \ Beluga Formation (Miocene) | Seldovia metamorphic complex (Early Jurassic) =
2 ere nae and Frartsock 1966 Tyonek Formation (Miocene and Oligocene) tka | _ Dikes (early Tertiary to Barly Cretaceous)
Karlstrom, 1964 es ROCK UNITS EAST OR SOUTH OF THE BORDER RANGES FAULT SYSTEM.
Wilson, F.H., and Hults, C.P., unpub. data, 2007 i Hemlock Conglomerate (Oligocene)
Afognak SEWARD QUADRANGLE Talkeetna Middle TURASSIC » (Oligocene) BEDDED ROCKS EXPLANATION OF MAP SYMBOLS
Island” nal'asd Giibors 1690 Formation SIETANGRBMICROGES | West Foreland Formation (Eocene and Paleocene) Let] Yakataga Formation (Pleistocene to Miocene) —— Contact—Dashed where approximate and inferred, dotted where concealed
Bradley and Miller, 2006 | Ksm_ | Saddle Mountain section of Magoon and others (1980) (Upper Cretaceous, Maastrichtian) Bs el Redwood Formation (Pliocene to Oligocene?) — Fault—Dashed where approximate and inferred, dotted where concealed
Nelson and others, 1985
Nelson and others, 1999 Lower Naknek Formation (Upper Jurassic; Tithonian to Oxfordian) Poul Creek Formation (lower Miocene to late Eocene) —v—~y-— Thrust fault—Dashed where approximate and inferred, dotted where concealed; teeth on upper
Tysdal and Case, 1979 Pomeroy Arkose Member (Kimmeridgian and Oxfordian?) Sedimentary rocks plate
Wilson, F.H., and Hults, C.P., unpub. data, 2007 —-——> Moraine Extent
ee | Snug Harbor Siltstone Member (Kimmeridgian and Oxfordian) wi Volcanic rocks
BLYING SOUND QUADRANGLE 4 Shavelneeeriverbauke
Bradley and Miller, 2006 [Rea Upper (Bad Northeast Creek Sandstone Member (Oxfordian) a Tokun Formation (Eocene)
Nel: id others, 1985 = s
Tysdal a vane 1058 rea] Chisik Conglomerate Member ae Kulthieth Formation (Eocene) Teeccontact
> CORDOVA QUADRANGLE Middle TRIASSIC Chinitna Formation (Middle Jurassic, Callovian) cm Stillwater Formation (Eocene) —~—~ Lineament
Nelson ae offers, 1985 VB., written commun., 2002 (74 Fayelot Siltstone: Member, Orca Group (lower middle Eocene to late Paleocene) ener Hips
A a in ° ‘onnie Siltstone Member edimentary rocks, undivided lajor roads
Figs ce : Richter and others, 2005 Lower Tonnie Sil Memb si ks, M d
a : Winkler and Plafker, 1993 ere Tuxedni Group (Middle Jurassic, Bathonian to Aalenian) [preead Conglomerate _| Glaciers
MIDDLETON ISLAND QUADRANGLE [Foo B F i oni
Winkler and Plafker, 1993 lovisei: Formation (Bathonlan) Valdez Group (Upper Cretaceous)
8 Twist Creek Siltstone (Bajocian) Metasedimentary rocks, undivided
MAP SHOWING LOCATION OF MAP AREA AND INDEX OF USGS 1:250,000-SCALE QUADRANGLES, CARBONIFEROUS (73 ! y >
A a . ‘ynthia Falls Sandstone (Bajocian? Interbedded metavolcanic and metasedimentary rocks
GEOGRAPHIC FEATURES, TOWNS, AND SELECT POLITICAL BOUNDARIES. Cc S: ian?) 'y

GEOLOGY OF THE PRINCE WILLIAM SOUND AND KENAI PENINSULA REGION, ALASKA

Compiled by
Frederic H. Wilson and Chad P. Hults
2012

‘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/3110/

‘Suggested citation: Wilson, FH., and Hults, C.P., 2012, Geology of the Prince William Sound
4 5 ' srs ise sang 2 a 3 : and Kenai Peninsula Region, Alaska: U.S. Geological Survey Scientific Investigations Map
Johnson Bay on Knight Island. The mountains in the background are the gabbro and sheeted dikes Turbiditic rocks of the Valdez Group. (photograph by Marti Miller) Pillow basalt of the Ophiolitic rocks of Prince William Sound along the western Contorted chert beds of the McHugh Complex mélange on Yukon Island in 3110, pamphlet 37 p., scale 1:350,000. (Available at http://pubs.usgs.gow/sim/31 10/.)

that make up the base of the ophiolite of Prince William Sound. The hills in the foreground are pillow shores of Knight Island. (photograph by Chad Hults) Kachemak Bay. (photograph by Chad Hults)
basalt and minor interbedded turbidites that represent the top of the ophiolite. (photograph by Chad
Hults)