Garnet Stock

 Clint

on  St

ock

G

o

ld

C

re

e

k

S

yn

cl

in

e

 Valley

 Garnet  Stock

Bla

ckf

oot T hrust

Bl

ac

kfo

ot

T hrus t

 F

ault

 Zone

R anch

C

re

e

k

Ha

rv

ey

C

re

ek

F

a

u

lt

Z

o

n

e

 Eightmile   Creek   Fault

 Fault

C re

ek Fau

lt

 Eightmile

N o rth

W

oo

dc

hu

ck

Po

to

m

ac

V alley

 Nevada

Bearm

outh

T h

ru

st

C la

rk

Fork

N

in

em

ile

Fault

U

p

p

e

r

W

ill

o

w

C

re

e

k

F

a

u

lt

-

A

A’

Eigh

t

mil

e

  

   Cre

e

k

 

 

 

 

  Faul

t 

Yms

3

Yms

2

Yw

Tkgd

Yms

3

Yw

Yw

Yms

3

Yms

3

Yms

2

Yms

2

Yw

Ysn

Ysn

Ysn

Yms

2

Ysh

Ysn

Yw

Ysn

Ysn

Ysn

Yw

Yw

Yw

Yw

Yms

2

Yms

3

Ybo

Ysh

Ysn

Yms

3

Ybo

Ym

Ygr

Ym

Ym

Ym

Ybo

Ybo

Ypi

Ybo

Yw

Ygr

Ygr

Ygr

Yms

Ym

Ym

Ybo

Ybo

Yms

Ym

Ybo

Ypi

Ysn

Ypi

Yms

Ybo

Ysh

Ts

Ts

Ts

Ts

Potomac V

alley

Blackfoot thrust

Clark Fork - 

Ninemile fault

Bearmouth thrust

Harvey Creek 

 fault zone

North W

oodchuck faultt

Ranch Creek 

fault zone

2000 m

sea level

-1000 m

1000 m

Horizontal scale same as map

No vertical exaggeration

Surficial units not shown

Datum is mean sea level

Ele

v

ation

6560 m

sea level

-3280 m

3280 m

Ele

v

ation

For a more detailed description of the map units 

and symbols, please refer to Plate 2.

MAP UNITS

30' x 60' quadrangle index

PLAINS

ELLISTON

HAMILTON

PHILIPSBURG

SEELEY 

LAKE

BUTTE 

NORTH

MISSOULA 

EAST

MISSOULA 

WEST

DEARBORN 

RIVER

100

0

100 Miles

90

94

15

15

90

90

Kalispell

Missoula

Helena

Great Falls

Billings

Bozeman

Butte

116°

104°

106°

108°

110°

112°

114°

49°

45°

46°

47°

48°

M O N T A N A

LOCATION

Open File MBMG 593, Plate 1 of 2

Geologic Map, Missoula East 30' x 60' Quadrangle

MONTANA BUREAU OF MINES AND GEOLOGY

A Department of Montana Tech of The University of Montana

Maps may be obtained from 

Publications Office 

Montana Bureau of Mines and Geology

1300 West Park Street, Butte, Montana 59701-8997

Phone: [phone]       Fax: [phone] 

http://www.mbmg.mtech.edu

Research supported by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under USGS award number G09AC00186. 

The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official 

policies, either expressed or implied, of the U.S. Government.

GIS production: Ken Sandau and Paul Thale, MBMG. Map layout: Susan Smith, MBMG.

Base from U.S. Geological Survey

Missoula 30' x 60' topographic quadrangle

Base Map date: 1984

Projection: UTM zone 12; 1927 NAD

UTM grid declination 

1°49' West

1984 Magnetic North declination  17.5° East

114˚00'

47˚00'

R 19 W

R 18 W

R 17 W

45'

R 16 W

R 15 W

30'

R 14 W

R 13 W

15'

R 12 W

R 11 W

113˚00'

47˚00'

T 14 N

T 13 N

T 12 N

45'

T 11 N

114˚00'

113˚00'

46˚30'

R 18 W

R 17 W

R 16 W

R 14 W

R 13 W

R 12 W

R 11 W

R 19 W

46˚30'

45'

R 15 W

T 10 N

T 9 N

T 11 N

T 14 N

T 13 N

T 12 N

45'

30'

15'

Geologic Map of the 

Missoula East 30' x 60' 

Quadrangle, Western Montana

2010

Jeffrey D. Lonn

1

, Catherine McDonald

1

, 

James W. Sears

2

, and Larry N. Smith

3

 

Montana Bureau of Mines and Geology

Open File MBMG 593, Plate 1

1

Montana Bureau of Mines and Geology; 

2

University of Montana, Missoula; 

3

Montana Tech of The University of Montana

Map Symbols

Overturned syncline: Showing trace of axial plane and 

direction of dip of bedding; dashed where approximately 

located, dotted where concealed

Overturned anticline:  showing trace of axial plane and 

direction of dip of bedding; dashed where approximately 

located, dotted where concealed

Strike and dip of overturned bedding

Strike and dip of overturned bedding where stratigraphic 

tops were confirmed using primary sedimentary structures

Horizontal bedding 

Vertical bedding 

Vertical foliation 

Cleavage 

Contact: dashed where approximately located; dotted 

where concealed

Strike and dip of inclined beds

Foliation 

Thrust fault: teeth on upthrown block; dashed where 

approximately located; dotted where concealed

Normal fault: dashed where approximately  located; dotted 

where concealed; bar and ball on downthrown side

Syncline: showing trace of axial plane and plunge direction 

where known; dotted where concealed

Anticline: showing trace of axial plane and plunge  direction 

where known; dotted where concealed

Tertiary andesite dikes

Strike and dip of  bedding where stratigraphic tops were 

confirmed using primary sedimentary structures

Low-angle normal fault: symbols on hanging wall

Tertiary through Cretaceous gabbro and granodiorite dikes

CORRELATION DIAGRAM

unconformity

unconformity

unconformity

unconformity

unconformity

unconformity

unconformity

unconformity

unconformity

Pennsylvanian

Permian

Holocene

Tertiary

Cretaceous

Jurassic

Mississippian

Devonian

Cambrian

Mesoproterozoic

Neoproterozoic

Pleistocene

KILOMETERS 1

0

1

2

MILES

1

0

1

3

4

5

6

7

2

3

4

8

9

10

11

12

13

14

7

8

9

10

11

5

6

15

16

17

18

19

20

12

13

20 000 METERS

70 000 FEET

60 000

15 000

50 000

40 000

10 000

30 000

20 000

5000

10 000

0

0

1000

5000

SCALE 1:100 000

CONTOUR INTERVAL 50 METERS

1 CENTIMETER ON THE MAP REPRESENTS 1 KILOMETER ON THE GROUND

---

Document Outline

• MBMG 593 -text explanation 
• MBMG 593 - This version is tiled and scaled for printing to legal-size paper