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

'

' "

.,.

,,

L.

from topogra 1 9 a

-

urvey pie alley 7 1

DUCTION T H ,1rl unoul 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 ny 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 cs-sivcly 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 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