U.S. DEPARTMENT OF THE INTERIOR OPEN-FILE REPORT 2007-1089 U.S. GEOLOGICAL SURVEY SHEET 3 of 8 158˚17′30″ 158˚15′ 158˚07′30″ 158˚00′ 157˚52′30″ 157˚45′ 157˚37′30″ Pamphlet accompanies map 21˚45′ 21˚45′

CORRELATION OF MAP UNITS Approximate age, in Polarity millions of years* Chrons [Boxes without color show ages of correlative stratigraphic SURFICIAL DEPOSITS COMMON TO SEVERAL OF THE ISLANDS formations on adjacent islands not depicted on this map] (nonlinear scale) 0 Qf

Holocene Qa Qbd Qdy Qld Qlg Qls Qtc

0.011

Qdo

Brunhes Normal- Qcrs Qcbc Polarity Chron QUATERNARY Qt

VOLCANIC AND INTRUSIVE ROCKS AND SPARSE INTERBEDDED SEDIMENTARY BEDS

Qokl Qokt Qoks Qotl Qott 0.150 Pleistocene

QTao olcanics

V Qol Qov Qobr Qot olcanics V Kalaupapa 0.78 0.78 QTkdc 0.988

Honolulu 1.072 1.173 21˚37′30″ 1.185 21˚37′30″ QTkdc

olcanics Matuyama Reversed- V Qbd Qa olcanics 1.778 Polarity Chron V QTkdc Ki‘ek‘ie Basalt 1.81 1.945 2

olcanics 2.128

V 2.148 Kōloa

Qcrs East Moloka‘i Qbd QTkl QTkt QTkdc QTki QTkkl QTkkdc QTkkbr

QTkdc est Moloka‘i 2.58 Qa W Ko‘olau Basalt Qcrs Qbd Talel Talev Talec 3.032 Gauss Normal- 3.116 Polarity Chron QTkdc Qcrs West Moloka‘i East Moloka‘i 3.207 3.330 Tapl Tapv Tai volcano volcano Qcrs Qdo QTkl Takl 3.60 QTao Takmk TERTIARY Talec Takl Takv Takbr Pliocene Tapl Takil Takiv

Talel ai‘anae

Qa olcanics

W Tall Talv Tapv V 4.187 Qcrs Talev 4.300 Qa 4.493 Talel QTkl 4.631 Ko‘olau volcano Wai‘anae volcano Gilbert Reversed- 4.799 Polarity Chron QTao 4.896 QTao 4.997 5.235 5.33 Qcrs Takl

aimea Canyon Basalt Miocene QTkdc Normal polarity (shaded) and reversed W

QTkl Pānī‘au Basalt polarity (white) shown for subchrons through end of Gilbert time QTao QTkl Qbd Kaua‘i 6.03 *Time scale from Gradstein and others (2006) Talev Ni‘ihau volcano QTao Talel volcano Tapl QTao Takbr 21˚30′ 21˚30′ 21˚30′ NI‘IHAU KAUA‘I O‘AHU MOLOKA‘I Takl QTao ? Qa Qdo Tall Kolekole Tapl Talel Pass LIST OF MAP UNITS ON SHEET 3 (THIS MAP) Takiv Qol Takbr Talec Qot See explanatory pamphlet for complete descriptions Takl QTkdc Takil SURFICIAL DEPOSITS COMMON TO SEVERAL OF THE ISLANDS Disconformity Mauna Takiv QTkl Kūwale Takil QTkl Qot Qf Fill (Holocene) Ko‘olau Basalt (Pleistocene(?) and Pliocene)—Divided into: Qcrs Takmk Qbd Qa Lualualei QTao Qov Qa Alluvium (Holocene) QTkl Lava flows Valley Takl Qcrs Qbd Beach deposits (Holocene) QTkt Vitric and lithic tuff Qf Takbr Tapl Qa Qa QTao Qdy Younger dune deposits (Holocene) QTkdc Dike complex Takil Qcrs Qdo Older dune deposits (Holocene and Pleistocene) QTki Intrusive rocks Qbd QTkkl Tapl Qcrs Calcareous reef rock and marine sediment (Pleistocene) Kailua Member—Divided into: Takl Qbd Talev QTao Older alluvium (Pleistocene and Pliocene) QTkkl Lava flows Takbr Qot Tall Tall Qcrs Conformable and interbedded to disconformable QTkkdc Dike complex within Kailua Member Qdy Tall Qcrs QTkkdc VOLCANIC AND INTRUSIVE ROCKS ON THE ISLAND OF O‘AHU QTkkbr Breccia deposits Talv Talev Talel Qf QTkbr Qov Honolulu Volcanics (Pleistocene)—Divided into: Conformable, possibly interbedded

Deposits from Koko fissure system—Consists of: Wai‘anae Volcanics (Pliocene)—Divided into: Qol 21˚22′30″ 21˚22′30″ Talel Qokl Lava flows Kolekole Member—Divided into: Takl Qf Q Tkl N Qokt Tuff Talel Lava flows Qobr Talev u Qdy ‘ Qoks Spatter Talev Vent deposits Qot u QTkkdc Tolel QTao Qf a Qdo n Deposits from Tantalus Peak and Sugar Loaf vents—Consists of: Talec Debris flows u

Qotl Lava Flows Pālehua Member—Divided into: Qotl P Talel a l Qokt i Qobr Qott Tuff Tapl Lava flows Qa QTao Qokt Qol Lava flows Tapv Vent deposits Qcrs Qokl Qcrs Qol Qov QTkt Qov Cinder vent deposits Kamaile‘unu Member—Divided into: Qol QTkt Qokl Qbd Qol Qott Qoks Qobr Breccia Takl Lava flows Qoks Qf Qot Qot Tuff cone deposits Takv Vent deposits Qokl Qotl Takbr Breccia Qbd Takmk Mauna Kūwale Rhyodacite Flow Qoks Qf Takil Icelandite lava flows Qokl Qcrs Takiv Icelandite vent deposits

Qdo Qokt MAP Lualualei Member—Divided into: Qot LOCATION P RI NC Tall Lava flows IP AL H AW A 21˚15′ II AN Talv Vent deposits I 21˚15′ SL AN D 158˚17′30″ 158˚15′ 158˚07′30″ 158˚00′ 157˚52′30″ 157˚45′ 157˚37′30″ S Tai Intrusive rocks

Geologic linework in Universal Transverse Mercator SCALE 1:100 000 Geology of Ko‘olau Range and many island-wide Contact—Approximately located 0 4 8 12 KILOMETERS projection, North American datum 1983, zone 4 sedimentary units from Stearns (1939). Digital Topographic base and bounding latitude-longitude ticks from compilation by K.M. Brunt, D.R. Sherrod, and S.E. Fault—Dashed where approximately located; dotted where concealed; queried where U.S. Geological Survey, Honolulu County, year of publication PLANIMETRIC BASE; NO TOPOGRAPHIC DEPICTION Watkins. Fitting to modern topographic base by D.R. extent uncertain unspecified. Universal Transverse Mercator projection, Sherrod and S.E. Watkins, 2004 zone 4, International spheroid Volcanic geology in Wai‘anae Range by J.M. Sinton, Dike—Showing trend of intrusions in units Tai and QTki. Depiction partly schematic 1980-2004. Compiled into digital version by D.R. Base, intended for visual reference only, is fitted to owing to exposure mostly in cliffs Sherrod, 2004 GIS-based coastline by inspection Geologic Map of the State of Hawai‘i, Sheet 3—Island of O‘ahu By David R. Sherrod, John M. Sinton, Sarah E. Watkins, and Kelly M. Brunt 2007 Available on World Wide Web at http://pubs.usgs.gov/of/2007/1089/