(deo) Copy < &

No- (560
U.S. DEPARTMENT OF THE INTERIOR C2 PROFESSIONAL PAPER 1560
U.S. GEOLOGICAL SURVEY PLATE 2B
seh 30 RoW RSW 123°00' R2W R1W 122°45' RIE ea
Ty Ty Si ty a © T iF’ LIST OF MAP UNITS
34 7 i é
Ons’ y @ ~~
ae ° A x
Ts © SEDIMENTARY AND VOLCANIC ROCKS AND DEPOSITS
J a Southern Willamette Valley (part) and Coast Range
D = Qns Nonmarine sedimentary deposits (Holocene
q © Tc \ a and Pleistocene)
- Gade Wereks 1 AN | Qls Landslide deposits (Holocene and Pleistocene)
Als Tsm
Be lue i, D 157 a a Qt High terrace gravels (Pleistocene)
hy ® G Tsm | 204 to -25 5 ‘
Tib 25 to -2157 Tms Marine sedimentary rocks (Oligocene and
T7S a 2) T7s
fre fee Eocene)
Vall Tsr § Y\ Tn _Nestucca Formation (Eocene)
% ar sh) as Ts Spencer Formation of Turner (1938) (Eocene)
Tsr 30 Ty [ot tg Tsu Upper member
NS Py ‘ Tsat|
A ‘ ee Ts! Lower member
30
K aaa oe a \ \\hete Tsv Volcanic rocks
5 = fe —~. ° iN Ty Yamhill Formation (Eocene)
‘5 °
70 Sok: 10° Ts Tyum Upper mudstone member
MIRIAM Elliott
ae (2 Mele Tym Miller sand of Bruer and others (1984)
=200., ey Tylm Lower mudstone member
Ty 93:to -200, =464 RTA Q QUINTANA Gath 1
i i Ts 70 to -82 89 P&. ey | 233 Ty Volcanic rocks
Ty 820-464 ae Ot x: aad
4 = -308 REICHOLD NGM WA Fmetogito -218 Tt Tyee Formation (Eocene)
- Qns err .
ad ¢ I) TH NMR Buesell 7 \ 276 [te Ba Tsr _ Siletz River Volcanics (Eocene)
pes ib 15 1237 e/a Bi
50 \ Sn q hs OREGON NATURAL GAS =1334 Tewf Tsv 796 Tsrk q i
Ty Ty 96 to +420 MITCHELL Bliven O SY Ts 86 to -93 Independences12-25, Tegr 244 to-176 wx S 7 Ts -1069 <q] sr Kings Valley Siltstone Member
© /98 \e Ty +93 to—215 210 Tms\ _ |Tms. 176 Stent Ty =1319 to -1707
aaa Lid 3 7261 Ts /-596
T8S = Tegr 206 to 200= Ty) ~990 to -1334 Ve rae Cascade Range Foothills (part) and Southern Willamette Valley
6 55 rns 200 Soy 7 (part)
‘S579. 0 .
“G MJ Ty /-949 to =1267 en 2“ Qns Nonmarine sedimentary deposits (Holocene
and Pleistocene)
RY AY ad Qls Landslide deposits (Holocene and Pleistocene)
=e °
oy a KOPN «* ees Qt High terrace gravels (Pleistocene)
¥ ba) ereind SRA gate
iy gins MiLLEn eee ars WEDS QTb Basalt and basaltic andesite (Pleistocene and
128 Ta ee Pliocene)
“Aan luvial and lacustrine(?) sedimentary deposits
=330 oat Tfl Fluvial and | (2) sed d
Ke ts | s0tecod (Pliocene and Miocene)
. Ty -94 to -330 Sardine Formation (Pliocene and Miocene)
4S — Tsab Basalt (Pliocene and Miocene)
Tsau Volcanic rocks, undivided (Miocene)
Ne Tsaa Andesite (Miocene)
°
i Tsat Tuffaceous nonmarine sedimentary rocks
(Miocene)
Te Columbia River Basalt Group (Miocene), undi-
vided
53 S Wanapum Basalt
15,5-£0.2
ro} Tewf
BS 3 vo 4 ary: ERNTSON Schermacher 1 ( © Frenchman Springs Member
Ty +163-t0=424 Ti , SS 101 Toot Grande Ronde Basalt
ee X "eas me PORTLAND'GAS & COKE ® “@38 5 /) Tas
fas, AY S 1 SA Steves 1 e iN tm 101 to 43 at Tlb Beier Seco undivided (Miocene and
CRAIG Gilmour 1 ( ots \y a cee GK pee)
$i j r fi COSA QX 7176 Tews Tms -119 to ~638 f i = Tibd ge aibacite andithvedactie (Miocene)
“y ww os
JACKSON-DAHL Gilmour’4, at at 14.7; 4'0.2 > > <6) Tb CA K Tibb Basalt and basaltic andesite
PORTLAND GAS 53 2D O
he & COKE =436 Li K hong Tsat Tibw —_ Welded to nonwelded ash-flow tuff
Wiederkehr 1 4 e % 1
ieee iu! Te RAO HS aN ? XS Tsm Scotts Mills Formation of Miller and Orr
45 als Y, i % as! : '
1049 % Ti c ©) DA (1988) (Miocene and Oligocene)
Tso 40 to 143 %, \ Q Tmo Molalla Formation of Lowry and Baldwin
Na Ty +143 ivan ta lS S cer} “a (1952) (Miocene and Oligocene(?))
Ti? -1043 to -1049 15 EN NI Tms Marine sedimentary rocks (Oligocene and
; +1314 % Qns : pews)
FUME Miley 1 Tms| $6.t0l-271 Tbf  Basaltic flows (Oligocene and Eocene)
1442 Te Sane any % Tb Tf Fisher Formation (Oligocene and Eocene)
Ts (51 to -318 = Ti
Ty -318 = Gy
Ter? 14804 to 1400 «0 | Qns Cascade Range Foothills (part) and Northern Willamette Valley
NS 20 Qns_ Nonmarine sedimentary deposits (Holocene
and Pleistocene)
CO) Rj d Pl
Ons AMERICAN QUASAR $ Qls Landslide deposits (Holocene and Pleistocene)
Henschell 17-34
T10S 64 wie Qt High terrace gravels (Pleistocene)
qT ee QTb Basalt and basaltic andesite (Pleistocene and
s 22 to42 4
Ty -42 to -806 eee)
Tfl Fluvial and lacustrine(?) sedimentary deposits
eo —— (Pliocene and Miocene)
a Sardine Formation (Pliocene and Miocene)
4 Tsau Volcanic rocks, undivided (Miocene)
SU Ot
4 / Tsaa Andesite (Miocene)
Tsat Tuffaceous nonmarine sedimentary rocks
le (Miocene)
-600 Tsav Volcanic rocks (Miocene)
Tc Columbia River Basalt Group (Miocene),
undivided
goa tb Wanapum Basalt
Towf Frenchman Springs Member
an! asaecmone) Tegr Grande Ronde Basalt
Tsc | Scappoose Formation of Van Atta and Kelly
=400 Tib (1985) (Miocene)
EPEAT QUASAR Tib Little Butte Volcanics, undivided (Miocene and
73 4 Oligocene)
4233 H Tiba Porphyritic andesite (Miocene)
H
THUS Tms 85 to 22 #, H OT Tus Tibb Basalt and basaltic andesite (Miocene)
H
=231 to =1230 s H <p Tsm Scotts Mills Formation of Miller and Orr
, Ze (1988) (Miocene and Oligocene)
iy ‘i _200 Tmo Molalla Formation of Lowry and Baldwin
‘ ° LINN COUNTY/OIL (1952) (Miocene and Oligocene(?))
H Barr t i Fibb 6 Tms Marine sedimentary rocks (Oligocene and
: 1113" Eocene)
i HESEING ems zi ps9 Lf Tbs Submarine basalt (Eocene)
. ks che ms toe.
H -2473 Tf. -36 Twh Basalt of Waverly Heights and associated sed-
4. Tms -129 to -283° \ sv? -170 22.6 + 0.3 imentary rocks, undivided (Eocene)
Tau <283 10-4012 Fan tpt -1ZHe SO
s —409-to-508 yw? =
‘Tsv =508 to -690 \r® Q ee
Sool, -690 39.2+0,5/m Ti
©, TyV =1069 to -2473 | od BY wee n\ Tibb INTRUSIVE ROCKS
8 NE (atl
H week © | ft All Areas
H ee (2D Or (i Tb Ti Intrusive rocks, undivided (Tertiary)
Hi &
H MERICAN-QUASA e378 0.4 A
H Hickey 9-12 isin el - aa
41,530.
WILLAMETTE Corvallis 1 : ale, 317208
69 ' +1326 o, Inferred contact
Trask -587 Tins. 29? to 4457 Ay
Ts 32 to -587? UA ints — Lrenelbsdisie where inferred; queried where
Ts h; a uncertain; bar and ball on downthrown side.
¥ 10 On cross sections, arrows show direction of
Be 1% relative movement; T, movement toward
SG eS viewer; A, movement away from viewer
a Ly a ee +eebeee Concealed fault—Dots grouped where location
‘ll is unconstrained; bar and ball on
@ 2 downthrown side; queried where uncertain
—— Strike and dip of beds
35 Strike and dip of overturned beds
as! | —+- Strike of vertical beds
Tb 9 & ; ® Horizontal beds
a }{— Anttictine—Showing plunge; dashed where
P & 22.8 $0.4 approximately located, dotted where con-
Saye? S S Qns cealed
' S 2 4-4—\ Syncline—Showing plunge; dashed where
t ! approximately located; dotted where con-
cealed
bes <-4— Monocline—Showing plunge; dashed where
xuke LS TIb inferred
——— Aeromagnetic high—Contours enclose areas of
high total intensity corresponding in most
Tass SEI OS i498 places to intrusive bodies mapped or inferred
at the surface or in the shallow subsurface
a —0— Structure contour—Drawn on the base of the
K iy Eugene Formation in the southern Wil-
GULF Porter 1 ARpDACES lamette Valley south of Franklin Butte and
86 oe) 2416403 Rogers Mountain and south and west of
+2581 * * 3 okies a Salem Hills (contour interval 200 m) and on
A a ! . aes ;
ee ma AMERICAN GUASAR & al ee
ty.-£703 Wetgen 26-32 a i ad
Tt -1758 84 T 21.7474 interval 100 m); dashed where inferred
Tst +2073 to -2581 4 25.44 0:9 at Location of seismic reflection profile
Muse Ga THA Subcrop (concealed contact) of Eugene Forma-
Tyee toad tion (not shown on map) and Spencer For-
7 ‘Qns mation (Ts)
' oO Exploratory petroleum well—Showing name;
GULF Porter 1 upper number shows elevation (in meters)
86 from which well~depths~were~ measured
581 (commonly from kelly bushing) and lower
Tms -75 to -287 number shows elevation of bottom of well.
ule Ts -282 Also shown are elevations of tops of forma-
tions in well relative to sea level
Water well
o Reaches contoured horizon—Located to the
quarter-quarter section
31.2 £0.3 © Constrains altitude of contoured horizon—
Ti4s Located to the quarter-quarter section
? a Reaches contoured _horizon—Accurately
Tibb located
\ Constrains altitude of contoured horizon—
Z Accurately located
a Locality of radiometric age determination(s)—
31.240.3 Showing age(s)
( j B i
P<
Tibb T=
6
eX
Tms 91t0-237 i Zi 23.8 +0.3
TF 8owlag37
Ts | -369
Tyv -577 Tib
Ty
Z 23.4 40.4
os Wa Tibb a
|
12°45) RIE

Geology by Erik P. Graven, Chris Goldfinger,
Kenneth S. Werner, and Robert S. Yeats

T15S
NN 15’
2)
R1W
297 + 0.8
-0+1.0
TY SETTLES Cindy i
105
-382
Tf? -5 to -280
Ts -280 to -382|
LEAVITTS Merle 1
121
+754
Tims 5 to=260
TH -260
Ts? +618 to -754
SCALE 1:100 000
TI7S a 1 0 1 2 3 4 5 6 7 8 9 10 KILOMETERS
eS
0 1 2 3 4 5 6 7 8 MILES
_— 1

CONTOUR INTERVAL 50 METERS EXCEPT FOR CORVALLIS, 1980, WHICH IS 40 METERS
SUPPLEMENTARY CONTOUR INTERVAL 10 METERS
NATIONAL GEODETIC VERTICAL DATUM OF 1929
1996 MAGNETIC DECLINATION AT SOUTH EDGE OF SHEET IS 18° EAST

Base from U.S. Geological Survey 1:100,000

North Santiam River, 1983; McKenzie River, 1983
Corvallis, 1980; and Eugene, 1980

Projection: Universal Transverse Mercator

25,000-foot grid ticks based on Oregon coordinate system,
south and north zones. 1927 North American Datum

Tib.

T18S T18S 1Department of Geosciences, Oregon State University, Corvallis, OR 97331
2Unocal Corp., Anchorage, AK 99519
3Unocal Corp., Lafayette, LA 70505
44°00" 5 2 ong:
123°30' 7 = 44°00'

GEOLOGIC MAP OF THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY, BENTON, LANE, LINN, MARION, AND POLK COUNTIES, OREGON

By
Robert S. Yeats, Erik P. Graven, |” Kenneth S. Werner,’? Chris Goldfinger, and Thomas A. Popowski?
1996

U.S. Government Printing Office: 1996--774-067