QTkdc

?

21˚30′

158˚17′30″

158˚17′30″ 158˚07′30″ 157˚52′30″ 157˚45′ 157˚37′30″21˚45′

21˚37′30″

21˚22′30″

21˚15′

21˚45′

21˚37′30″

21˚30′

21˚22′30″

21˚15′

158˚00′158˚15′

158˚07′30″ 157˚52′30″ 157˚45′ 157˚37′30″158˚00′158˚15′

Geologic linework in Universal Transverse Mercator projection, North American datum 1983, zone 4

Topographic base and bounding latitude-longitude ticks from U.S. Geological Survey, Honolulu County, year of publication unspecified. Universal Transverse Mercator projection, zone 4, International spheroid

Base, intended for visual reference only, is fitted to GIS-based coastline by inspection

Geology of Ko‘olau Range and many island-wide sedimentary units from Stearns (1939). Digital compilation by K.M. Brunt, D.R. Sherrod, and S.E. Watkins. Fitting to modern topographic base by D.R. Sherrod and S.E. Watkins, 2004Volcanic geology in Wai‘anae Range by J.M. Sinton, 1980-2004. Compiled into digital version by D.R. Sherrod, 2004

21˚30′

SCALE 1:100 000

PLANIMETRIC BASE; NO TOPOGRAPHIC DEPICTION

0 4 8 12 KILOMETERS

Geologic Map of the State of Hawai‘i, Sheet 3—Island of O‘ahuBy

David R. Sherrod, John M. Sinton, Sarah E. Watkins, and Kelly M. Brunt2007

MAPLOCATION

PRINCIPAL HAWAIIANISLANDS

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

OPEN-FILE REPORT 2007-1089SHEET 3 of 8

Pamphlet accompanies map

Available on World Wide Web at http://pubs.usgs.gov/of/2007/1089/

QTkl

Takl

Tapl

Tapl

QTao

QTkdc

QTkl

QTkl

Qbd

Qdo

Qot

Qov

QolQot

Qf

QTkkl

QTkkdc

QTkbr

Qdy

Qdo

QTkkdc

QTao

Qokt

QoktQokl

Qokl

Qokt

Qokl

QoksQoks

QobrQa

QotQdo

Qotl

QolQTkt

QTktQottQbd

Qf

Qcrs

Qf

Qf

Talev

Tolel

TalelTakl

Qcrs

QTao

TakbrTakl

Takiv

Takmk

Takil

Tapl

Talel

Talec

TalelTapv

Talev

Talel

QTaoQcrs

Qcrs

Qcrs

Qcrs

Qcrs

Qbd

Takbr

Takl

QTao

QTao

TalecTalel

Takil

Takbr

Talv

TallTall

Talev

Talev

Talel

Talel

Qbd

Qot

Qol

QovQf

Qot

Qcrs

QoklQoks

QTkl

Q Tkl

Qotl

Qf

Qcrs

Qoks

Qobr

QaQTao

QTao Qa

Qa

Qa

Qbd

QTkdc

QTkdc

QTkdc

QTkdc

QTkdcQaQbd

Qcrs

Qcrs

Qbd

QdoTakl

Qa

QTao

Tapl

Talev

QTao

QTao

QTkl

QTkl

Tapl

Takl

Qcrs

Takl

Qbd

QcrsTall

Takil

TakbrQa

Qot

QolQovQol

KolekolePass

LualualeiValley

MaunaKūwale

Nu

‘u anu

Pa l i

Takiv

Tall

Qdy

QaQbd

Qcrs

Qol

QTkl QTkt QTkdc QTki QTkkl QTkkdc

Qov Qobr Qot

QotlQokl Qokt Qoks

Talel Talev Talec

Tall Talv

Qa

Qf

Qbd Qdy Qld Qlg Qls Qtc

Qcrs Qcbc

QTao

Qt

Takl Takv TakbrTakmkTakil

Tapl Tapv Tai

Ni‘ihauvolcano

Kaua‘ivolcano

Ko‘olau volcano Wai‘anae volcano

East Moloka‘ivolcano

West Moloka‘ivolcano

NI‘IHAU KAUA‘I O‘AHU MOLOKA‘I

Wai

mea

Can

yon

Bas

alt

Pān

ī‘au

Bas

alt

Ki‘e

k‘ie

Bas

alt

Kōl

oa V

olca

nics

Ko‘

olau

Bas

alt

Wes

t Mol

oka‘

i Vol

cani

cs

Eas

t Mol

oka‘

iVo

lcan

ics

Kal

aupa

paVo

lcan

ics

Wai

‘ana

eVo

lcan

ics

Hon

olul

u Vo

lcan

ics

CORRELATION OF MAP UNITS

SURFICIAL DEPOSITS COMMON TO SEVERAL OF THE ISLANDS

VOLCANIC AND INTRUSIVE ROCKS AND SPARSE INTERBEDDED SEDIMENTARY BEDS

QTkkbr

Takiv

[Boxes without color show ages of correlative stratigraphicformations on adjacent islands not depicted on this map]

SURFICIAL DEPOSITS COMMON TO SEVERAL OF THE ISLANDS

Qf Fill (Holocene)

Qa Alluvium (Holocene)

Qbd Beach deposits (Holocene)

Qdy Younger dune deposits (Holocene)

Qdo Older dune deposits (Holocene and Pleistocene)

Qcrs Calcareous reef rock and marine sediment (Pleistocene)

QTao Older alluvium (Pleistocene and Pliocene)

Conformable and interbedded to disconformable

VOLCANIC AND INTRUSIVE ROCKS ON THE ISLAND OF O‘AHU

Honolulu Volcanics (Pleistocene)—Divided into:

Deposits from Koko fissure system—Consists of:

Qokl Lava flows

Qokt Tuff

Qoks Spatter

Deposits from Tantalus Peak and Sugar Loaf vents—Consists of:

Qotl Lava Flows

Qott Tuff

Qol Lava flows

Qov Cinder vent deposits

Qobr Breccia

Qot Tuff cone deposits

Disconformity

Ko‘olau Basalt (Pleistocene(?) and Pliocene)—Divided into:

QTkl Lava flows

QTkt Vitric and lithic tuff

QTkdc Dike complex

QTki Intrusive rocks

Kailua Member—Divided into:

QTkkl Lava flows

QTkkdc Dike complex within Kailua Member

QTkkbr Breccia deposits

Conformable, possibly interbedded

Wai‘anae Volcanics (Pliocene)—Divided into:

Kolekole Member—Divided into:

Talel Lava flows

Talev Vent deposits

Talec Debris flows

Pālehua Member—Divided into:

Tapl Lava flows

Tapv Vent deposits

Kamaile‘unu Member—Divided into:

Takl Lava flows

Takv Vent deposits

Takbr Breccia

Takmk Mauna Kūwale Rhyodacite Flow

Takil Icelandite lava flows

Takiv Icelandite vent deposits

Lualualei Member—Divided into:

Tall Lava flows

Talv Vent deposits

Tai Intrusive rocks

Contact—Approximately located

Fault—Dashed where approximately located; dotted where concealed; queried where extent uncertain

Dike—Showing trend of intrusions in units Tai and QTki. Depiction partly schematic owing to exposure mostly in cliffs

LIST OF MAP UNITS ON SHEET 3 (THIS MAP)See explanatory pamphlet for complete descriptions

Qott

Qdo

2

5.33

0.78

Pliocene

Miocene

TERTIARY

2.58

0.78

0.9881.0721.1731.185

1.7781.9452.1282.148

3.0323.1163.2073.330

4.1874.300

4.4934.631

4.7994.8964.9975.235

Normal polarity (shaded) and reversed polarity (white) shown for subchrons through end of Gilbert time

(nonlinear scale)

Matuyama Reversed-Polarity Chron

Gilbert Reversed-Polarity Chron

Gauss Normal-Polarity Chron

Brunhes Normal-Polarity Chron

Holocene

Pleistocene

QUATERNARY

0.011

0

0.150

3.60

6.03

Approximate age, in millions of years*

PolarityChrons

*Time scale from Gradstein and others (2006)

1.81