Wash ington Deportment of Natural Reso ur ce s Division of Geology ond Earth Resources ' i • 122~00• Bo se fr om U.S. "Topographic 1= 250 1000 series Yokimo Ouod, 1 958 45' Edit ed , rev i ewed, and odjustecl to l: 250,000 scale to pographic ba se mop by Kurt L. Oth be rg, James G. Ri gby 1 and Gl ennda Mcl uc as N 2 10 :-----.._ MN ENUMCLAW 31 Ml . ,, I, R 10 E ."/X SURFICIAL - Open File Repor t OF 79- 15 This report Is prel i mi nary and hos not been formally edited or reviewed ,·--r: ' 0 ,.· .;.J I ( ,'M S PATCH i \ / f / < ' " R 13 E '~ E 171 "00' R 15 E R u:, E 45'. GEOLOGIC MAP OF THE YAKIMA QUAD, WASHINGTON by 0 0 Newell P Campbell 5 1979 SCALE 5 10 Co ntour Interval 200 fe et 10 Mil es 15 Kilometers CLE' E:LUM 20 ,-fl R 18 t 30' R 19 E Pr od uced in coo peration wit h Ro ck wel l Hanford Ope rations and the U.S . Deportme nt of E ne r gy ·Note: See Co mpani on Report for discussions of structures. S 1 - Topp en i sh Ridge S2 - Ahtonum Ridge S3 - Ho r se Heaven Hills S 4- East Selah fault S 6 - Selah Bu tte Ar ea S7 - Miscel la neo us Ar eas 2 100 000 ; ' ! ' 1 O.l'o N i . i ' ' ' : 0 ! Geo logy mapped in 1978 -1 979 • )""·-- r ., ' f ' ' ,I 1 1 ' I ,, l I -I ., I t \( I ' \ ' ·.- . I I 'i I ' \ '{ I ·I 1· ( ( Correlation of Mop Units ' Qd - ? - Qc j :z: ? QI Qls rn l ~v1~:'J ? Qgd Qfs Qfg Qgl Qtb ? ? ? ? Mj - Tc Te ? ? ? ? Ty ? B (l[SCRIPTION Of UN IT S Qd DUNE SAND - Active .and st abi l ized dunes of predi~ately fine to 111e d ium sWldj moe t ly quartz and baeal t gr ai ns reworked from older ·sediment ar y deposits. Qa A LLU VIl.11 - Pr i mari l y st r e111111 de posits of si l t, sand , and grave l i n f l oodplains, ter r aces , and va lley bottOfflS . Includes lo: al l ac ustrine', pa l udal , and eolian de posits in depressions. Qaf ALL UVIAL FAN D£ P05I TS -Primari ly 1..W1Conao lideted sand and gravel . Surface is r elatively undisaected and exhib its little or no petrocelcic s~il devel opMent (ca l iche ). Qc tOLLUVI L.t'I- P riMarily angular to subangu l ar ba88ltic debris accUftlU l ated at the baae of st eep slopes and cli ff s. I nc ludes t alus and talus cones formed by ac t ive and i nact ive rockfa ll . Qls L ANDS LI D£ DEPOS I TS - Uns t ra t ified and poorly- sorted clay, si l t, sand and gr avel deposited by rotational and trans l ational sl ides end f l ows . Ql L O£SS - Loese dep~ite conslating of eolian silt and fine sand up to 75 Me t ers in th ickne s s. Qafo llfs llfg Qtb Ilg! Qgd Qt QTgt Tt Tr Tc Te Ty pm G eneral l y not ma pped whe re l eas than approxil'll8tely 2 111eters thick. Locall y contains multip le petrocalcic horizale and te phre beds. OLDER ALL UVI AL F AN ()[POS ITS - P rimarily s emi-consolidat ed gravel or feng l OMer ate. Surface of fans are dissec ted and capped by well -developed pe t roca l cic so il s (c al iche) . CA T ASTROPHI C Fl ()(l) SLACK- WAT ER SED IMENTS - Rhyt hfll ica l ly bedded and graded silt , send , end grave l de posited by l ower-energy s l ack wa t ers of catastrophic f l oods and (or) surges of catastrophic f l oods. Inc l udes the T ouchet beds. CAT A STROPH IC FL()(l) GRAV ELS - Predominant l y coarse gravel and sand deposit ed by higher -energy w at ers of catas t rophic flood s. TE RR ACE AN) B AR DE P OSI TS, UNDi ff ERENTI AT ED - Glac:iof lu via l, f luvia l, ·and ice - contact strat - i fied si l t, sand, and gravel deposits of various l itho l ogies in terraces and bars in t he valleys of the Colulllbia , Okanogan , and Spokane R ivers and tributaries . Includes depos its of the Gr eat T err~e . GL A CICK..ACUSTRI NE TERRA CE . DEP OS IT S - Silt ·, sand , and grave l depos ited in glacial lakes t ha t fo rt11e'd al ong the. Coluni)ia, Okari og an , and Spokane Rivers and t heir tribul.aries. In- c l udes de p08its of t he Nespe l e m Te rr ace. Surface of · the ter r aces "'8Y exhibit local IIKJdi fication by fluvi al and ca t as t r oph ic f loodwat ers. GL ACIAL DEPOS I TS - Ti l l , ou t wash, and ice - contact strati f ied deposits in mo r aines, till pl a ins, and niell-water channels and t erraces . TIHCJII ANOESITE - Andesitic flow of the lower Nac hes R iver dra inage. GR AVE L . Of T ER RACE RE l"NANTS - Gravel and coar se sand in re1111ants of hi gh fluv ia l terraces and alluvial f ans wi thi n the Ya kilfl8 River drainage basin. Includes the Cowiche gravel. Age uncert a in, but For1J1ation, may and be i n par t corre la ti ve wi th Th orp Gravel, grave ls of ancestral Col umbi a Ri ver (Tc). Elle nsburg Formation, Ringold THORP GRAVEL - Fl uvia l (?) gr avel in di ssec t ed hi gh te rr aces and a lluvia l f ans in the Kittitas Val l ey . P robably cor rela t ive wi th t he upper Ringold Forll'IBtion. RI NGll..D FORMATJ ON - Fl uvial and lacustrine clay , silt , sand, ccinglD111erate and fanglomerate of d iverse composition. Incl udes a cap of thic k, well-developed petroca l cic soil ( caliche) . Hay be correlative with t he uppermost Ell ensburg Format ion. GRA VEL OF ANC E ST RAL COLUl4:II A RIVER Predominant ly well -roonded pebble gr avel. Columbia Riv er provenance indi c~ted by a dan inance of quart zi t e pe bbl es . E LL ENSBURG fORNAT ICtil - Pr iM&rily weakly lit hif i ed fl uvia l and l ahari c deposits. Base un- defi ned. Mappe d on l y where they overlie the Yaki1J18 Basa lt SubGroup. DDlninated by dacitic , andesitic , and pum iceous c lasts. YA KIMA ijASALT SUBGR OUP - Lava flows of t he Saddl e H CNJ ntains, Wanspum, and Gr ande Ronde Basalt for1J1&tion~ . I ncludes sedimentar y interbede of the El lensburg encl L atah For mations, local colluvium, celiche , end widespread thin loess. P R£-MI OCE NE ROCKS, UNO IFF ER£ NTIAT ED -Primari l y PrecBl!lbrian through Mesozoic metamor ph ic and plu t onic r oc ks , and ear l y· T ertiary sedimentary and volcanic rocks . Contact Map unit symbol s, co rrt lo ti on 1 1 and deacript ions compiled by Kurt L, Ot hbtrg , James G. Rit;i b) \ a nd Glt nnda Mc Lucas Geologic Mapping of L ate Cenozoic Sedi~ ta , Coluntiia Basin, Washington 122° 120° ,, .. ~-+-----+-----+--~-..- _ ... :5 _470 4 _ .... Geologic ""'Wing, 1978-79, by N.P. C~ll (a rea 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 lli e ( area 'j,). The ,j,,, olagy of tl>II nort h ei,ntul Wella Walla Qu9drang l e, and t,... ~out.h c 90t rul Rihv ille ~edrang le W&B field checked, si11Pllfled, end gr,n,,n l~ 1ze d frcan Groli er and Bingt,- (1971 ). The ge olog~ of the sooth- e Hhrn portion of tne Weoatche Quadrangle ns f ie ld ch9cl<ed, s i11Pl~fied, and gene ralized 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 Counti es, llaaMngton: U.S. Geological Survey Hi!tCell-ou e 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.,:ili.pDrt 77 -531, 2t p. ' ' ' r;j . ·1 _,