State of Washington ALBERT D. ROSELLINI, Governor

Department of Conservation EARL COE, Director

DIVISION OF MINES AND GEOLOGY MARSHALL T. HUNTTING, Supervisor

Geologic Map GM-1

PRELIMINARY GEOLOGIC MAP OF THE HOBART AND MAPLE VALLEY

QUADRANGLES, KING COUNTY, WASHINGTON

By

JAMES D. VINE

U. S. GEOLOGICAL SURVEY

Prepared cooperatively by the U. S. Geological Survey

STATE PRINTING PLANT, OLYMPIA, WASH.

1962

For sale by Department of Conservation, Olympia, Washington.

w SHINGTO DIVIS IO

DEP R ME T OF CON SERVATI ON OF MINES A D GEOLOGY

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from topogra 1 9 a

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urvey pie alley 7 1

DUCTION T H ,1rl un<l M, le al!cy quudrnnglcs ure locutco.l n the eas t n

m,i rgin of Puget Sound Jo,i.lan<l about JI to 26 miles utheast of the c tcr of Seatt l . und include parts of the T iger mmtain- aylor M un.t ,L! n upl and nrea in rhe wes tern foolhills of the Cascad,;, Range Al tnmles 1thm I e qll' dr.\ns les range rom ubo, l l ~ to ~.000 feet. E~ccp for e small f, m~ m l lo wl umls nnJ numcro11s suburbun home site~. st of (he ,1ret1. 1s he,w ly limber J . M~plc Vu lley is Jocrttcd on St(ltc H1ghw y 5. b t ween Se-1llle au<l Em" n~J., w A h,ud UL fac unty 1<,.1uJ l>clw n Tssa'lu,111, ,,l>oul 2 mi l s t 1 e north. n R,,venstl,ile. oul 2 Jes to the th ov,Je ,cces, th· H 1rt areu T rnvel w1th1n 1mhu land, ,~ gcner,tll 1estncted by the n v ndowrters and go rnment agen 1es who aJmin,~ter 1he 1 n<l Ti ve! estr t1 ons 3pp!v 1CI e aslnng t 1t nl o Natur,t l Re 1rces 1o~ds an the C o f Se:'.ltt le C'e<l atersheJ

,td~

The coal fi el<.i s of K ng Cou ty drock gcolosy of th

J cscrib~d bv vans ( 191 2). , as pr vious!y mapp by Wa , ,en anJ

Th,

i ston WI! tn m Se

l 945) . The rc<1 rl . fi om whi~

196 The WI iter WIS

sum of 19.'i.9 n C. L quadrangle. which a map by How rd D s me project

-c n\ , vesltgalion 1s ~1uered I both these valuable basic d at~ hi,ve been inc rporated

op 0 nt1vel b th l..'n ite<l St.ties Geological me.~ an,J Geology o f lhe Washington Dcp.1rt cnt 1s mdeht d lo Mr E H Rogers o er Chief

t, f gr,rnting perm1ss1on fr I). H. owling. Fore~tcr

1str1ct " est r, u,h-Re$ource~. for gnm n~ per u~~1on worl..

1Jlt rn 1i,nl,c1 1e~t'lve. id,J wutk wa~ e August 196(), and pnrt of Juoe und July

nowlcdgc Lhe a5S ,ta of I'. J. P· (cc n e ice dtmng t he su J96l.f. T Cumb land he Hobart q u hus b n

le~an Wanek as I p.ir t of lh i~

RllA Y RO ST Tl R

Ra 1n ive Fo a t , 1 1 Rilgmg RL ve, Fol nrntmn of Eo~cnc age " the lle~l rock unit that

o ps m th ~ :.ire,1 fl named an.d l scr1b~ in another report (Yme, 1962) ptclastic volcamc sand~ton . st llstune. and congl crate of marm o r1 Ill

· mpose most ot e expos Lil es of the Rag:m Rive ormat1011. Though t hese ks ar p1obub!y at least 3, 0 t !Ind , ly lh upper 1,()00 to 2,000 feet

are y; 1 e:ii: poscd. Th I wer part of t Raging Rher PormMion ha5 been in 1d by igneous sills l recrysl 11,zed. is broken by fa111ts. and is

largely covered b. glacial deposits rn lhe v.,lley nf the ,ver , so that detailed knowledge is lackmc T he se rt of th1 fornrnl10 IS medrn gm ark-i.ray, fi ne- to me um-gni.med impure

le me aandstonc tha t 13 gcnc10.ll well , tcd very th' k beddc T he m,Ltr1x ontams rock ~ml mmeral ~n nt~ a nd ci::mcnt. mcludms c· · le, the rnmcr Is ch lo u le and montmcmllomtc, nd yr c. ms of p l~giocla comp sc at leait 50 perc nt and l a!ly as m h s 9S percent o f ~ !us 1i trnctmn. I outc s common ly form massive re-sis ta ledges that He ~evoto.l of visible my or 1.tmmatmn th gh irhcn-

GEOLOGIC GM- 1

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WASHI GTON

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DE M P '

aceou~ la n:1e oc 11r !l'1..::., ll y Alt1 ll the ~r,·e·1m, ,n· ny of 1h u1 ro

ard rounded sha e• thal resemble those o e-grnined igneous edium- to conrse r ned frwbl e snndstone and chert pebble conglo

fo Nck

'" lack cop out local!y n the R11 'ng River Formation. and d<•,k-grny o 1a~s1 e carbona,c011s clay,tone occ111 . locJIJ} at the top.

A manne una, mcludmg g3~tmpods. pelecypods, scaphopo<ls, el hinoi<l:-. ind Fciram n e1 a 1s c ha1 aeterist1c of the er grn i of\nlMonei an,J silt

, loss ls w re coll ected rom sev 23 N.. mei;afossils were

Pu t Gr p

b1bly of midd!e the formatio

1 )

T,ga Mvi, 1111 Fm 11 ,1,on -The 11l lln ne rocks o the Ras rng I vcr F rmu· re co m b!y overl,,m by get G roup (White, ! 88 , 47 , u

sequence of no rocks mch,d,ng both volcamt und no11vok arn~ (~cd,­n ntar}) types that h e aggregate th1ck nes~ o nearly ! ,0[}0 f (

cal . The Tiger ou in Formation (Vi 196 consisrn of abo ut ,000 feet of nonvolc ni rocks m th lowe1 part o th rn .1equence. tc ropp1ng

ks of the Tig M 1n · m f mat on consist chiefly of arkosic an m caccou s,mJotone that 1s rnm grained and cross lanunated 1, gr,iy un<l wn C ia) m inerals constnute the matn x m these

obubly rcpr sc 1ore tha n JO percent of the ock. Montm I n s! ,,bundm1t clay mineral n sandstone nenr th P. hnse where arc trunsi t10nal with t nderlymg marme rod:~. wherea~

chi it is edom nant all ve the bru.: [4 1() to 2 O fc ,pper part of lhe Ti~ r Moun(mn Fornmhon mtcrstrat1fi v1th JC rock of (he o>erlymg l \ 1 For IL throughout an interv,1\ o f

800 feet 0 1 rnvH. A of \ and coal occur,; , at lea$!

locally. nc ,r the I f t Tiger Mounta F ma t!o .

Leaf fo~stl T iger M mt.u n F atw n have b wri t1 en communic:it on 196 ! ) JS probt ly id ge, ·,nrl fo~M l~ of ]ale en ug have n identified from T wil a For m tion th t1t a re I k r-strat cd with the upper part the T ,gcr Mo, ta Fornution The Mountam Form at ion is ere/o re classed 11s m d ie(?) a

11 /i. 1 1/ Fm ma1 11m T h Tu w1la F cirmat n ( of an<lesit tc volcamc reek~ abont 7 OU feet th1 k t at ~re w and mterstrat fled th t he o v came roc ks in 11 Puge roup t arc ch arncter1zed by rn1caeeo11s sand one Epiclastic \O can san<lstone. tufface s s1l l5tone, 111ff-brecc1a, !came coni: lo erate and thin vesicular lava ows sills compose the bulk of t e Tukw ila F mation Qua rtz- ~n m ,,-hcari ar kosic sandstone beds (designated · D, E anJ F) a, e interstmt,fied with the prcdom,n tl y volcanic sequence on the sot\lh il e of T aylor Moun tain. C rite is an abundant :tl tern t1 011 pr uct, not o nl} m the volcanic rocks but lso 1n the nom ok antc ~andst e bells, w re b h the cl y mat x ml the mica n~kcs have heen a ltc r~d t chlorite. In gene ,a l, tli e uppcr part u f

re <.'Oa rse-gra!ned iclastk roc l:s 1ha n tu recc1.1 ~nd volcanic conglo merate of rit c andes es than occur lower n the n1c conglom rat bci:ls r resis t nt ledges

1he Tukw In mal lOn !he low par t T hese me t e more co,1rsely xlt re(! p ph form · n. . T , rccc1 and olc

11 • Jo old 1 Creek Lo~ b fi ner gr ,n.ed and fin r ten m ed - s i

rm t,on I eaf fossil.I fl Ill th ree locnl, · cs R 7 ) m th Tu Form,mon h ave o th~r, ( l 9fi l I as l,,te Eocene m ui;i,

I , I ~>sis\ nt letlges , e f med the lo wer p.tr\ 1he Tu~.w1 !

(secs 8, 17 . ond 27, T 23 N. en des ignated by fe a

R e ton orma1w11 -The Rem ormauon 1s tile younges t mau re gmzed III the Pnget Group of this ttre,I {Wal 10n. l9 t consists of ,,rkosic or feldspath 1e 1111caceous sandstone. siltsto ne. carbonauous clavston , ,\ ,J cotJ I. os much d~ 2 2~0 feel th ick . nforrnoblv ovcrlv111g lcun roe s of he Tn w I,, F rm,1 11 011 S.1nd,w n hells 111 the Rent 1 Formation gc 11e1all 1' ,IIC g1,1 line cd 1urn g1.11n~tl .in I call1• 11 glome1.1 li l.,m. natctl cru,~ 1m1n.ikJ u, humul,'c ,1com aml f1 1 b lc. bu1 - ll,tin n1 e q ua11z

and fewer plagioclaie fe ld~par gr:u ns than n ' l of !he o! r 5 ndston bed of the P t1gN J ay is the chief cementing m: eiial of the sand orte heds

ther nrbonale mmcrah ire loc ll bnndOnt Mass,~e l., rnrnatcd silt ~tonc ,,nd ca, on,,~ m claystone a , rntc,

1~ T hese fint 1 g, ., ined 1(1 h d ompu~~ rta ,Iy tu so I nl} form v" lle 1d~es of ~andst e

oal and clay at Mountai n, or, and ea belong to t e Formation The clay cl ystone beds 1n th 11ton F t1on chH-

Leaf os~1ls om the Renton · 1 mullon ncJ r T ay lDr sec. 3 ·r ' N 7 E . ml neu Ced~, .\1 u1 s~c 2 . T 2l R 6 , urc la Eocene in. age. u1 loc ll y, est o hsaq u:1h, the R ton ,s f poss,\:,le l.,t oc e

eurl 1t O goccnc ai;c accor ins to Wolf und other ( !9 h l )

n,c Roe ~

volcamc sandst c platy a. lie stra1igraphicall y

outcrop is located th~ other in sec 23.

in a similar s1rat1 -i;rap c position arc several tllousuntl feet thJC

u,1drnns lc and c their lower p rt ,lC JJ g l Wo e :md others ( 1961 ) , T hc,e roe· mappe<l b W rr<rn :.HJ other ( 19 S) ,\ pm! of the Keech

were

wc1· r. on the b ·~ of Hee k I Water , l fake. C . A

1u k,1 l1on l

r l,i n~hip belw~en 1h Kee~ Jus Andcsit1c Sc1·e ,mdesillc they ar

vok umc rock Oh!c!OCe ,Ill

., m!11 1s, iJ.lTICOII ~ m s~c JO, Issaquah C ~k .

ck i, T 2:S

KS sides

where

Mount Ramie , lcrx, wnUcn corn­ed \o cstabl1sh a is rca and the

The b'C o the 1t is tho ght that

' " ass1v greems gr y porp lie inlru~ivc un crlic.s p r1 of lhe \1k wilu Formuu but 1s Ji,; cor<l,mt with the att' udc the Ti, w,b. Phcno.ry~ of r ble nde nd o ucU lug,oda~c .1~ ,,,u~h ,1. 5 11 1111 11g d ,,11,1~tc1i.:,; ll1~ m!r~1s1vt 1gneo :;

rud . The plagmclasc henocry s are much allcrcd a appear wh te. Re­r l,1ccmenl of 1nu l rod: m iner: ls chl onte 15 ~on1mon 'J e igneou s rod, JS ,11 st 1de l,cal m lcx l1 e ;,nd general :1ppcM,111ce w ith s 1e of the v came conEI mer,ilc a,1d 111 breccm brn11.Jc the T uk il,1 Formuti The i Crus,on 1s lhciught to ~ gen 1 ,ll y relal l lo ti Dk t1111c ks 111 the

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GEOL

T ul: F m !ton th h ~ugsest that this I h!y us

cvu.lcncc wu~ rnJ

IC S CTIO

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oungc r ,g \ OS roe ~ 1 ru .Je th seo1m tary " nd vo .t !ll~

rock. q, cc. not,1 y in h ici n1ty of , T iger M n m. F,fteemml Creek, and R,1ging Rtvc1 . where sevc1al form res1~1ant rnlges and peaks. T hey a!.o fo r he resistant knobs tlmt p1 OJeCl l rough the glacml dnft neai: C d ,1r Mounti11n ·1 hese rocks genernll ave a porphyn 1c t xlll an d comist of phcnocrysts of h1 b1ado11te and iiugtte I to 3 m m long Jrl an J tergrunula t gl,1ssy m trix. ' h have nverage compos1t1on of a calcic ndc '1e 1n whkh plugioclase const itutes 1ore thim ha t he volum of the rock Ma y of !he oriw nnl minera l grams of these I nemis rocks hav been altc rc<l to cnk le wh, n ,~ n,11 111 te ~~ much ,, ~O percent !he

l\1m of t ro~ !oc:, ll y

H DROTHE LL LTE ED ROCKS L hyd,o thermal alteration J1.1s produced siliceou s, k, l!n,u . '

forrn: r c s in h1ch the on ma\ con~tnuen have been pa tly t completely ui.Jhl , t he nta Wt!h su rro1,nd1ng rock, is gene rall y tr nsit,onal H ro-them1,1Ily al ei ed rock ar c h ,tr ,t erm ,c f e ,tre<1 o m.1Jor struct u defornwuon he1ween ger and outh ge 1 111mins.

Y DE SITS Much of the ~urfo t :i.nd \' lley qu,,drungfo~ 1

ckl mun.II t>y trnte g till , i;round moru111~. lacustn sill and s.1nd. slran ou t ish /; velly JJve, term deposi'~ l,mdshdc debri. pe,Hy s\1am deposh~. and mDdern ;dlt1vrn st of these de os!1s wer formed during lelstocenci glaeial Rtages a d Fur ·111 evulence ot oecupat10 b conttnental glaciers thick enough to overnde a ll it the hi hest penks in !he a ea. The ) ungest. o r Vashon drift l Wtlhs. 1898), is e.~ pcised me, most of the a ea L call , however. deposm of sand, peat. and other mate11als represenu ng on or ore older rift sheets ma} be seen below the Vashon dr ft aloni; 1 e wa lls th edar River canyon m he

aple Va ll ey q11adrnng;le \ 11 R o r~l cnm m11111c~11nn ) Till is un d as high as '.7()() fee• T g~r Mo unt n (elevat 3 ,004) a l

th hisheirt n gc of T:,y the peak f Snuth Tiger r>.!mmtam. and th ~k f th~ 1,n nurncd mile wes,1 of gcr Monntam,

h1ch ~re ~ c 2 000 lowl nd, m c west rn , L of c arc, ,tre chm,,dcnzcd by drum groLI mor,11nc thul ,

y huried y l~lcr proglnc1al 'lr:m ed t fo rmed hy 01 wa sh streams .1l o !he 1. e T he ~rauml mar ne 1s sc,ir r by llway

chunnds a11d ~trc:om lerrJcL'S ft n ·d as melt-water st reams occupte , 11c cs­sivcly low routes alon~ th northwe, tw,ml-re!reatmg m~rg,n of c The terraces re covcreo.l by v~ 11ublc th ickness f str,1t1fied 11uvml d os11 ~ c pose of ,mtl and pebble cobble gravel Loe ly, t e •lac1 ! drt fl is covcrc by deposits of silt ,md sa !act trme si lt and and depos,t occu Ci eck . extcuo.!1 g us 1th a s oba l

wher lh1v1 al Ml! u sun wo laige faml slide c<.I. OM west and uaothcr south of T yl

t,tt l 'POSIIS arc lkrcd over t e ~urfocc of ti moram I dep 11 5. l csc pc,1l 1kru:;1ls. 1crn1 ,ug i;:g ! !9 .'i~ . 69- 3) ,uc ,.; ipu~cd u l s dJmcn L.iry and ntir 11s va11cti~s I ith local co1 ·~nu a11o ns o f splmgnum. woody

ut. :md extra cous mo1g:1111~· mutter Fu1lhc cla~ ,fl atto of 1he pelU <lepo,tts 1s given on the sot! 1 p P 1lson 1u1d othc~ ( l 52 ) Recent a lluv m is resent nlong Cedar 1v r ,1 d in the lowcr part of th vn cy

b suqu,1h C reek.

REL RY G 0 OGIC ~ PO TH

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PR EPARED C OPER TIVEL Y BY U.S GEO LOGICAL URVEY

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A L O G LI E A -A '

TRUC E R ·~ m t e T iger M untain-Tay!or

, ll fat ted into a , ie1 of arcuatc ~tm

the rea east o Hobart an the re(l. Tl ud,us o f the arc c

ve1 Af ,l t 1 ,lll \'

mg 1ver Th

nti me

w

11 its southwest s' e The

ountmn upJ,.nd are,, ~re folded utures th.,t tren.d norlhwc•l Ill

dcr ca,t

" rlu;

ain tm fold

x nii pr h:ohl h:os :, sr ratier:ophic ,h~place enr feet Near the n th e of the an!t , ppcr beds the at ion are fau lt d i to contact ith h drothennally a ered oc be derived from the gcr nt 'n Formation Mini m displaceme th f u t is e~ti a· from the fact chat at Jca5t ~.000 fe et of strata sl uld occu between the outcrop of the Raging Rive r F ormation at Tiger Mountam a the outcrop of the Renton Formauo I nu le to the wesi. Hobart fau lt 1 ostnlaled on the apparent Oup ltc t1on of tuff-brecc1a beds between olde1 C k and th est fl 11k uth T iger Mounta, the Jscilated ex sure of older Creek, and on the pparent .'.l upt ter 1na n the

n at the axial trace o[ the Sher od ant1el1 vera\ transverse faults, nearly perpendicular to the tr~d of the , r u.1

,;tructures ev1ously described. occur on S,:mth T1eer M unt:l.in :i.nd rth to the Fiftccnm,lc Creek :,,re:'>. O ne sn:h fau ll is , ferred to pa~s between the two peak South T1i;cr Monntnin because of t abrupt htholog,c chungc bet ccn and \ naltered rockd. Severa Sllch faul~ of a few feet d,~-

laccment ar r orted on 1he ,nine maps of the abandoned coal wrn kmg, on F iftecomile Creek, and 1his coal fleld 1errnina1es abruptly northward aga111~t a JUUJO tranwerse fau lt that brmgs the Rent Formation on the so11th ainst the Tukv, 1l n Formall o e north Th so h bound ry of Squak Mou ain and the range of hills that extends n ear! to Lak Wash­m ton may refle' a westwar contmuaticin of tht5 t end.

he bedrock structur n the lowla11d area 1s poorl} th~ extensive cover of Quaternary deposits. Locally,

:.., coal m ne rec d i 1cale the strud I 1n this nrea dip O -40 SE., but cast o Ced r River. dis1,lacement are indJcat north uf ke Desir R b mj fu lth

IC GE

CO L

y

d ,rcctly Cedar

Coal occ-u s m many stratigra 1c zone, throu •bout t e Puget G r

T

s, of t al that ha~ been due d c me from the Re ton Form tion Taylor, and the Tiger Mountam mi es I t 1fteenm1Je m 5 are all a ndoned and the en1 ways caved or

coal, ereas the Cedar ed fly subbitummous coa A

m fl f ese areas. Tables f coal

APLE A. ............ E By .la e D. Vine

U S. Geoi o' I u1vey

GEOLO G IC S E

(Osso , 193 1, Geer, '1 1) list fi ve n h ick is m t he Ced r Mo nta n

It eq 11va lcnt to o f th e T11k .v1I:, ! ~tru , ral po; ,t,o , her lcrprete

I ) ulso show,; a co 1 p rospe m the E , that m11y be m the carb ac u~

material of t T uk",l om t,on Mt h add,t, nill coal m e R 10 ii 111ferrc(\ ie the mantle of Quatern ary de s,ts ad cent uplands ext d ing somh fro F 1r1ecnm1I C r ek ar to 1he icin1 art an d thence eastwa rd t Jl l e r uylor ar Colll almost certa ly underhes most of the lowland area. but the thicknc~~ o over r<len lil un wn e area t 1 ved to be u Ucrlain by coal-be, ng bed i so la rge that the amoun t und ,srnvercd c I iy e eed by for t oiigmal reser es t hat ~re kno from minm

,th of the Cedar n nd est of L ru:I burg. :I ~cries cf Ii • CN !

r,mgmg f ma ut 5 Lo 10 feet m th kn ,s and ()f h1t11m1 rank are own ext a sh t distance mt H the south. C:ach t lhese beds lias been mm In 1961 I P er Cokmg Coal Co ntheSE!4 scc24,T22N . 6 E

b~ a faul t .omew near the Ceda fathasn

past ogc bed abl y lfsct r th of than mo~t

lsewhcre m I qu,,rlrnn2lc~ b ut their rrelahon with beds to c nor th is t spec1fi~:; II~ knQwn Foss1 leaves ollcctcd fro m lot:uh t¥ 9695, :;hout rec qu,,r tcrn of ,, mile ~ th of he II art quadran.glc . b tw~ n t .andi b rg an Roi; i ~oal bed~, "c

ide fied I y Wu!fc l•n lfe ;md o l!,e,s ! 61) as of probable rn 1J Ule Eo~e11c age. hesc ro~ks ur p ubly r~-T u~wi la ,md ma. tx: e4\11vaknl lu a p,,n

f th e lower m;u bod} of the Tiger o tmt~m m auon

The ccial reserves for the ,\fea ar tabulated 1n a report Be1 m,tn a ot s \ 1961) Coal ,n' nes th.ii have produced and other nonmetal lic m nc1,1l

ur the ana , re hsted and bnetly de,c bed by v, !en! nc ( 196 l.

CLA Y

C.ir onaceom d i\Y~t,)n ,mJ IMone beds inlc rbc<JdcJ w1lh coal m t en. ton Fo rm., t,on and lll al par1 of the P11get Group

have be n a major source of th materi ,,!s fo r the clay mdu,try in the eat e region The m, ~ at Ta lor oduce<l both co:,! and cl:iy for u5e in

makmg t,le nnd br,ck T charactcnst1 c of the ~ •ra mcd rocks m l c Rent n Form (lt n that make~ t hem SJ.ntable or Ll~o m baked chw prodl,~h ~ a urently tl1e wi,kspread predciuunan~e ka imte ov munt mo !lumle 11d chlo in the c lay mat rix. Ka He abo oc ' rs !ocallv as t rinc1pal

clay ineral m sandstone and fin~r grame 1oc ·s in the T Jg r Mounttun F ma t1on , wherea~ montmon llo rn te or chlorite is the prmc pal cla mineral

the rocks the g1ng R er Format1 1111d thNe, t ge er w1 ve r. mic htc, occur m st of the Tl1kwila m tion H igh- tl umrna refrnctory d y (Glo er. 1941. p P - 13 ) h,tS be~n pro need fr ks strati~raphic.ill

GL s,

ION A LON G LINE B

Geology y J D ssrnted by P. J

n C L Ric

ne, 195 Pattee

he M p!c V , l l y , o.ve ot a ye t s. Glover ( I 4 1,

rb yo li · 0111" Ill the T y l U JIC<l W ,1'

ml 1s o f espec,~I interest bcc,rn,e ll

ti red A lte red c k of similar appearance the st side South 1ger Mountain, Jn

he ,,11 ,1ltered rock. A ther rock that ma have n st1 cs is the ~1 cred tuff thn t o 1rs nt ma Y pl,1ce,

al,on Samp W-1 fro m lhe

T 23N , R 7E, MSU

Tuk In Fornrnl!on 1n 1he S '/4NW \4 sec. 27. ttled t the U S. 1rern1 of Minei Nor thwest

ashmgton, fo el • .y lc,1ing, nnd they 1~por J ti ns: one 3 26 ), a li i;h fired color ( t . a n

accord, g to e rma! ,maly5!5, prob.ibl coiis,st ed O eJ wm kaoi1mt or hallo~sJ\e.

A plasuc mixture f cluycy s~ndstone, s1l1~l0ne . anU · !,1ys1orn ,um the enton F ormat! m the N \4 sec 3U, 2 N JC 6 E . ear Ced :'.lr Mou nt

has een mined the naugh Moldmg Sa C f use .is a o n,:: 01 f mdry and e eat e flrea.

Cnr nae elaysto and siltstone from the nonvo! n1c IC ks n Pn get Gr s well as t unde rl ying Ragm R iver Formahon ha

1mdcr recent b} sewral pr1vutc orgnmzahons r oss1blc u~c ro , b loating cl y in the manufa tur e~panded ~ssregatc s ,m1hu J,ght-wc1g t pr uct~ tmg clay h!IS bee ident ed rn th ~dar ountm ,uca, Uut I la to, st have been 1ade by t e o log,c,,t Surv fh o,t reli able method of ide ifying materi., I 5 Ul ablt: 1h1 1 purpo~t:

ually ' Sli ~ 1h~ bloa ti nlc' charnc1eri,1lc s <:>f 1!1 roe 111 :, h h lcm­f nae .

Tl STO E l n the Seat reg o broken rock has a I de vau cty of use~ a, ~on-

slrt t1C1 11 one ranging from ne aggr g,lle and dccora1t1•c g2rden s1 to riprap, depending on th size of agments Rock umts suitable r s[}m of these uses should be sin by to masm•e. ard. ,ind r e~1stant to wenth 0 ing nn rock used fo r deconit ive stone sho Id ulso posses:, a plea sing ccilor a d xt ur Tn he Hobart a nd Maple Valley quadrungks, volca nic rock. ntn1s1 ,an~u r h , ssibly sand~tonc may be useful fo r constructJon

~to ne Mossive I dges o cu nic rock th sui table for !his purpooc occur t 10.ny pJr,ecs u kwil Fo loc Jly 111 t lower pa rt

r · Ii: th111 ,s pro

.md,t ,\S m T kw1la Formation m the

ssiv fi e c:ru e paris of t he

Alth 18 ~.tn<.l land. locally t h r

1ad r,mglcs may be the st Ruging

'

s D the Puget ar t a11d

tr:msp tat1 n tleposJts ja glac ial outw:,sh ,ltlJtLt:

SHINGTON

l []IIJ

A ndce1t i volca m c rocke

E PLA ATIO

EJ A llu 1• m

osits Chiefl Mdunetdar

n~mo 1 ody pe , f 1Mous, 1nn ed. loca ll 11 1~i th splw g­aml e;r;trv..11eou8 i Q? {]Cimic detritus

D,

Te ate gravel ri ft P bles, cobbles, U,m,/. buid M 'S cs n1 1wil as

fote ,.~ ·atijied with iml a11d il/ 08,1 as glacial o ttwo.sh

eet I ng d i i eJ1y

,·o so/1 ulerl sil t rwd wnd deposits locu /l11 ~t. tifi ed

Qg, t, 11 mpo~ed of 1·a11 ~1/ty " »mea d w,th l,o /J,,, " !!(f. ~11 nrl ,1t f l>e p u, 0, (/11 sl?atified tw,i~hg>(Wl d!),.CC l! I fo Ike 1111/o•/C/s, 1111d , 111 morawe, ch e y

Ml. i11 the lowlunds. gm drwml111ized qro ,d 11w1·ai11e , cluefl.y til i t 1e fo wl m1ds

G

alt,:.n·cd rock

OLOGIC GM-1

>­Cl'.

z Cl'. w f­<( ~ 0

l' lcrinfo 1rndsto 1w, congl ome1 le, 1ecc 1 , 11 d, ba6.,,U1 !« 1Juffo Th ,ck,1 t:1i li 1<-rr de /e1 ,i11e

Con~, ls r.h 1~ny v s , r.eo~ s, arg 'lm;eotts, ,ind Jt;1n · tnrnernls 01·1gmu. 1Jdi w1 e /ernuned

Ill 11s1v rock Ivneou roe eo M tmr; h.1

f,'. I d athu (Wd 1kcsfo miwceo ctt1bo1w <> s d r1!J 8trm e, Qmd coca IL I 1<C (! 2,2 0 /rtt

' h i !m ess

ndeS1:tic volcrwnc sondst<me, t,, ifaceoHs ll -1!1;011e t11ff- b, eccui, volcrimc c,111 lomerrite,

nd la a f QS, 111 / r bedded l ly w , I ui /, osw 1111d c hlo 0 it1c sandstone bed s desiu­,it C, D,E, a11 F. L ow erpn1tp1ter­

drat1(ied wit l i Tig t1 Moun twin Fm m(itwn. T ido /Js l (illy as w,1wl roti 7, IQ feet

1

1l1111mlll1I T er Mountam ormati n

P ug-et Group A , k!J ~' 'l/.1,(; <{C(l<> IIS MlnrU t on e

l,edrlerl wit/1 v me sun u- 11 uO«l

;l r k o ic r y muuweo 8an sfo11e, co rbanil. - J cem si lt tone, ond coal U11P e pc t nitm·­<trQf.1f1 P-d >mth Tukwi l F o m ull n Tlud·-

11 M : fl I /)/ jRet

T c

R grn g R iver Formation E , la nc ni S'! J,,to n 1/ , t,.me. !omliy

c,n1 lom e ,·a t1, Contam s au wd1rnt mariwe mo/I i, l· s Th· r.lm ess al l st !!,Oou ln cnlly n(< '1l of TJ sPl'l

(tf<f.

- - --- - -- - --

al bed, a pp xi a te l:, locat Sha 1·,1a 0 1d c , 011 ._, , t ru, e JJl'IJ /~cfo,/ l/J ~1<, fu ~e j )um

lih d, w here rnf , , e rl , d led r>J 11dicul es 1mce1 inl y of

> f e, to or,l kd

11oine h o, ,uhe1e eo:-ice.a l cxurte.m:e

Contact , p ro x nn tc: Joc~t Short rl ~hed 1 ha e i11}MT t

- u_~ ---- ••• ••• ?.,. 0 ~

ln c · ta lt

t • i i ine

· "" "'!J 1101; o/ax 1rl p/u.?1 a 11n 1,,.,u ,1111 aml µ /1111v of ~:C l Du. ed wl, e , <IP}JIO rnrn/ e/y lorn /e(/, r l 1 ~ e <1here 11J'e r«d, d i«u wh~1 e , un~e(1/cd

----l:--+ - - -Syn cl me

a ~e ,,.f 1w.:ud z,lanc a ll(/ N 11l'V1> /I Mtd pl•, Drn ed ,.,h r e Pl' :. frw tcly ca fod , d

wh e1·0 i>1fo1· 1·ed, dolled wkei o ~onceal

,:, () IIJ /1/g t u/ axt da,s /, od

S ·1 und d1 o ds

St 1keanddi fov t ut edb s

Sea p sepata i11g Ler ace:;

Min , qu , or ·ave ! pit

d areas S l,vw ng onl •"Y or s!w.ft [1?•

/'MIi b 11 1/Pr/ U '

7J/)ron m I~ , •·eh w h re 111di at ed o

oll n ~. ~ ir.1!1111 1·e orts. t, ,li.111 in pe o

• 9130

oss1l lo it , me Joa

e urls

C

SC ALE 1 24 000

ta t

Porphyl'i t ici

CQ NTCUR I TEr.V AL 5 FE A D 2 F ET (E T ) TUM 1$ SE/\ L ~VEL

L

l MILE

t h~ " la nd. De ;;1l gbcrnl grnvd oc in tt 1~s lri d z e a n c f he ~outh and west slopes th T, er Mountain- ~ lor Moi1nrain

upl1md rea In sene ral , th ,OQ(). oot contour I may b~ cgarded as 1h npper limit of this gravel. and the lowe r 1 1s conccul d b lnt deposits

W it C A 1888 0 the Pt1!;Cl roup of Wa~hm~t T err ory Sci , 3d s r V 3 , p 3- 0

\ lhs. Bail y, 189 ,ft e nom entt o f •set Sound G o "Bull. , v. , p 111 !62

Am Joor

~ w f-

. Ame rica

,ll .ohitudts t lrnt r ,mge 1 about 800 fee t cast of Hobart to bout 50(1 olfr, J . A .vcr, H . 0 .. ,, V mc, J, D. 19 61 , [::C und c rre lation of feet no rth or H oban e depcislt s 11 1 ][lfer for u se as sand ~nd grav I because they contam t much silt aml cl:iy. 1 a!w contam mnny boulders more ih ~ 3 l eet III mmet

OIL AND S ecul al1 (J n g co n n H ti ,,1 .,ccumul tio

1 and ~a s III he M aple t1adra11gles is of inlere t beca11sc of the prcscnc so rec for orf': muc u ni ,n the m,irine rock~ th~ Ragrng Fo la( n P ort more, there arc num rous p ssib1ht1es for !dent fy1ng ~ uctural fc,m n-c~ ucl and tilted strnt.1 term naled pU p agamst a fault .vhere 011 a:i be expected to acc11mu la.le d fticulty. howe er, ,s the a of permeflbil y m rn ny of t o\1t · ops ol the gmg oc urrence of a depcisit o sc on ,lfy black m,\tenal c 1a1 that coat t c gra1 of s:111 m the 1ger ount fl n

17. T 23 N R 7 E suggest ,idc 11 ,,tc t knsl l Hy m t ese roe s.

REFE ENCES CITED 8 e1k m,u1 , H , G owe1. H D ., nd Da a, T A M 196 1, COil l 1cservcs

Washingto n. Wa.shmg!Cln D lures a Geology ult. 7, l J p v,m$, , 19 12, The al fi elds of g mty Wa1h1ngtcin Gl-OI

1rvey Bull 3, 2 7 p G r, M R , 1941, D cscnpti o f mm

co als, Su l 1c t 10 tech ical pa fi t8, p 4~- 7

samples l 49 1· U S

Analyses Cl Wasbrng n Bur Mmes Tech ,1pcr

G l vcr , S. L., 19 B ull. :! , 3

l , Cl.1 ys .md ~haks of ashmgt n Wa,h, gt n o ,v Ge ogy

O~goo, D .. l coals : U

·~ctip11on rs nc T ech

1 nc s 111 le, J,. A u,ily of w , ngt n P pc, 49 i 1111 198

oul~on, E. w r R ,llld anne1 I). I ) 2, • ,1 Su y o Kmg County, Washing! n U. S. Dept Agne lLurc, S I Sur vey R pt. ser 19 8, no . I . J p.

igg. G B 1958 Pc. ll r~s l es of Wash, gt W.osh in gtnn n ,v 1, and G eology BLill. 44 ,

Smh, GO an C ins, F . C., 191)6 D rnngle l ashmgt n]. U. S Geo! Su rvey

Valentine, G M. 196 Inventory ()f N nmetalhc mmemls. revise b • M nnd G e logy Bull 7, 17

v ·. J . D .1962, one es nd

c s m a part o G eo g Re In

W ld ron, u s

eolog I Quud

the Des M 'nes quadr· ngle Mup GQ 159

ua lm 1e qu~< LO 139, 14 p

!-2nd ell . . M nc ~

mg Co n1 y , 2 l. 0 p.

Wa:,hmgt

Warren, ~ C , o bm.tth, H us, Gr i,etu, R M , and w S P 19 5 , Prehminar) ge ot!c map and brief cles lpt! on th coal field s of Kmg Co1inty, ~sh ngton u ~ Ueol Sur y [Co al] Map, ale: I · JJ ,68()

W r.., A C. 196 1, eechcl us prob[ , Cuscade Moll lams. ashmgto n· o hi ,t Sci ~ v 35, no 2 . p. 39-57.

t P get group, · ng C mt an h ro og1c ,cJcn es U S. G

ash1ngto n. /11 o p apers 1 t he geologic St, Prof. er 42 -C p -C23.2 .

EXPL ATION

Noom"' ne nd sio=, ~1"'""' o,d da1<1ono

E3 Numbe r, «fe, 10 b eds

'" fort < r old

Vol<:<:m •< " " ~" meraio und ruf br•«<>

. "' Vol<M•< ro, , ,nclvd,0 9

om< "'C<l>ton• tvtt on d ru b .. , ,

1 · • ..-.1 Co,9 lomcro to

""""" -I eou, s, II

" ' I ,000

12,00 0

11 000

'°

( on,oCT w,rh .,,d.,,,~ """""''

' "'' """

.... • T ~ • ~

X • • • • • •

.. . X • • I< X > • ;----., . . . .

l====c.aa 000 • •

·" " . 0 ss.s,====cj C

• • >

" . . . "

Rent F mot

Tu k ii

T,ger N, ntorn Fo·mat ,

Rag mg R,, Fo,m t,~,,

GENERALllEO TRATIGRA I SECTI OF ROCK PO D I THE TIG \0 TAI TAYLOR NT.I> UPL D AR ·

f ors leb Conse1 v t1on, 5 cent

p