Wash ington Deport ment of Natural Resources

Div ision of Geology ond Earth Resources

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122~00•

Bose from U.S."Topographic 1=250 1000 series

Yokimo Ouod, 1958

45'

Edited , rev iewed, and odjustecl to l : 250,000 scale topographic

base mop by Kurt L. Othberg, James G. Rigby1 and Gl ennda Mcl ucas

N 210 :-----.._ MN

ENUMCLAW 31 Ml

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SURFICIAL

-Open File Repor t OF 79- 15 This report Is prel iminary and hos not been form ally edited or reviewed

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GEOLOGIC MAP OF THE YAKIMA QUAD, WASHINGTON

by

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Newell P Campbell

5

1979

SCALE

5

10

Contour Interval 200 fe et

10 Mil es

15 Kilometers

CLE' E:LUM 20 ,-fl

R 18 t 30' R 19 E

Prod uced in cooperat ion with Rockwel l Hanford Operations and the U.S. Deportment of Energy

·Note: See Companion Repor t

for discussions of st ructures.

S 1 - Topp en ish Ridge

S2 - Ahtonum Ridge

S3 - Horse Heaven Hills

S4- East Selah fault

S 6 - Selah Bu tte Area

S7 - Miscel laneous Areas

2 100 000

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Geology mapped in 1978 - 1979

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Correlation of Mop Units

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Qd - ? -

Qc j :z: ?

QI Qls

rn l ~v1~:'J ?

Qgd Qfs Qfg Qgl Qtb

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Te ? ?

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Ty

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(l[SCRIPTION Of UN ITS

Qd DUNE SAND - Active .and stabi l ized dunes of predi~ately fine t o 111edium sWld j moet ly

quartz and baealt gr ains reworked from older ·sediment ar y deposits.

Qa ALLU VIl.11 - Pr i mari l y str e111111 deposits of si l t, sand , and grave l i n f l oodplains, terr aces ,

and valley bottOfflS . Inc l udes lo:al l acustrine', pa l udal , and eolian deposits i n

depressions.

Qaf ALLUVIAL FAN D£ P05ITS - Primari l y 1..W1Conaol i deted sand and gravel . Surface is relatively

undisaected and exhibits little or no petrocelcic s~il developMent (cal iche ) .

Qc tOLLUVIL.t'I- PriMarily angular to subangul ar ba88ltic debris accUftlU l ated at the baae of

s t eep slopes and cliffs . I nc ludes t alus and talus cones formed by ac t ive and i nac t ive

rockfall .

Qls LANDSLID£ DEPOSI TS - Unst rat ified and poorly- sorted clay, si l t, sand and gr avel deposited

by rotational and trans l ational s l ides end f l ows .

Ql LO£SS - Loese dep~ite conslating of eolian silt and fine sand up to 75 Met ers in th ickness.

Qafo

llfs

llfg

Qtb

Ilg!

Qgd

Qt

QTgt

Tt

Tr

Tc

Te

Ty

pm

Generall y not mapped whe re l eas than approxil'll8tely 2 111eters thick. Local l y contains

multipl e petrocalcic horizale and tephre beds.

OLDER ALLUVIAL FAN ()[POS ITS - Primarily semi-consolidated gravel or feng l OMerat e . Surface

of fans ar e dissect ed and capped by well-developed pe t roca l cic soils (cal i che) .

CATASTROPHIC Fl()(l) SLACK-WATER SEDIMENTS - Rhythfllical ly bedded and graded silt , send , end

grave l deposited by l ower-energy s l ack wat ers of catastrophic f l oods and(or) surges of

catastrophic f l oods. Inc l udes the Touchet beds.

CATASTROPH IC FL()(l) GRAVELS - Predominant l y coarse gravel and sand deposit ed by higher-energy

waters of catas t rophic floods. TE RRACE AN) BAR DEPOSI TS, UNDiff ERENTI ATED - Glac:iof luvial, f luvia l , ·and ice-contact strat­

i fied si l t, sand, and gravel deposits of various l ithol ogies in terraces and bars in

t he valleys of the Colulllbia , Okanogan , and Spokane Rivers and tributaries . Includes

depos its of the Great Terr~e .

GLACICK..ACUSTRINE TERRACE .DEPOS ITS - Silt·, sand , and grave l deposited i n glacial lakes t ha t

fort11e'd al ong the. Col uni)ia, Okariogan , and Spokane Rivers and t heir tribul.aries. In­

c l udes dep08its of t he Nespe lem Terrace. Surface of · the ter r aces "'8Y exhibit local

IIKJdi fication by fluvial and cat ast r ophic f loodwat ers.

GLACIAL DEPOS ITS - Ti l l , ou t wash, and ice-contact stratif ied deposits i n mor aines, till

pl ains, and niell -water channels and t erraces .

TIHCJII ANOESITE - Andesitic flow of the lower Naches River drainage.

GRAVE L .Of TER RACE REl"NANTS - Grave l and coar se sand in re1111ants of high fluv ial terraces

and alluvial f ans wi thin the Yakilfl8 River drainage basin. Includes the Cowiche gravel.

Age uncer t ain, but

For1J1ation,

may

and

be i n par t corre l ative with Thorp Gravel,

grave l s of ancestral Col umbia River (Tc).

Ellensburg Formation,

Ringol d

THORP GRAVEL - Fluvial (?) gr avel in dissect ed hi gh terraces and alluvial f ans in the

Kittitas Val ley . Probably cor relat ive wi t h t he upper Ringold Forll'IBtion.

RINGll..D FORMATJON - Fluvial and l acustrine clay , silt , sand , ccinglD111erate and fanglomerate

of diverse composition. Inc l udes a cap of thick, well-developed petrocal cic soil

(caliche) . Hay be correlative with t he uppermost Ell ensburg Format ion.

GRAVEL OF ANCESTRAL COLUl4:IIA RIVER Predominant ly wel l - roonded pebble gr avel. Columbia

River provenance indic~ted by a daninance of quar t zit e pebbles .

ELLENSBURG fORNAT ICtil - Pr iM&r i l y weakly lithif i ed fl uvia l and l aharic deposits. Base un­

defined. Mapped onl y where they overlie the Yaki1J18 Basalt SubGroup. DDlninated by

dacitic , andesitic , and pumiceous clasts.

YAKIMA ijASALT SUBGROUP - Lava flows of t he Saddle HCNJntains, Wanspum, and Gr ande Ronde

Basalt for1J1&tion~ . Includes sedimentar y i nterbede of the El l ensburg encl Latah

For mations, local colluvium, celiche , end widespread thin loess.

PR£-MI OCENE ROCKS, UNO IFFER£NTIATED - Primaril y PrecBl!lbrian through Mesozoic metamorphic

and plut onic r ocks , and ear l y· Tertiary sedimentary and volcanic rocks .

Contact

Map unit symbols, corrt lo ti on11 and deacript ions compi led by Kurt L, Ot hbtrg ,

James G. Rit;ib)\ and Glt nnda Mc Lucas

Geologic Mapping of Late Cenozoic Sedi~ ta , Coluntiia Basin, Washington

122° 120° ,, .. ~-+-----+-----+--~-..-

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Geologic ""'Wing, 1978-79, by N.P. C~ll (area I ) ; L.C • ..._on

(ar ea 2) ; £.P. Kive r , D. r . Stradling, ISld J.C . Rigby(-•) ) ; C.

0. llatlater (area 4); ~ J. T. Li llie (area 'j,). The ,j,,,olagy of

tl>II north ei,ntul Wella Walla Qu9drang l e, and t,... ~out.h c90t rul

Rihv ille ~edrangl e W&B field checked, si11Pllfled, end gr,n,,n l ~

1ze d frcan Grolie r and Bingt,- (1971 ). The geolog~ of the sooth­

eHhrn portion of tne Weoatche Quadrangle ns f ie ld ch9cl<ed,

s i11Pl~fied, and generalized rr,:.., Tabor and others (1!'77).

Grolier, H.J.; BingMIO, J.11. , 1971 , C..ologic 11ap and sections er

parts of Gur,t, "'-""' and r ranklin Count i es, llaaMngton: U.S.

Geological Survey Hi!tCell-oue C..o l ogic lnveatiqat i ona Hep I-S89, 6 ,,.._t,,, scale, 1,62,soo.

Tabor , 11.W .; and other&, 197?, Prel1Jli0111ry ~ologic up of the

llenet~ 1,100 ,00 Quedrangle, \1119hln!jton: U.S . Geological

Survey Open-fil.,:i li.pDrt 77 -531, 2t p.

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