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TRANSCRIPT
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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R 10 E
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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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(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
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Qgd
Qt
QTgt
Tt
Tr
Tc
Te
Ty
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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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