4400

4600 4800 5000

4560

4600

4800

5000

4600

4800 5000

4400

4240

4400

4600

4800

5000

4400 4600 4800 5000

6000

6000

5400 5200

4600

4800

5000

5200

4400

Nation

al

C

r

e

e

k

Bert

Crater

Varmint

Rim

Drive

Rim

Drive

Pinnacles Road

R i d g e

Grayback

Ridge

Road

Phantom

Cone

Pumice Castle

Boundary

Butte

Sand

Creek

Quarry

C A S C A D E R A N G E

(Oasis

Cone)

SEVENMILE

CREEK

FAULT

ANNIE SPRING

FAULT

M A Z A M A

M O U N T

northwest

basin

central

platform

southwest

basin

Merriam

Cone

east

basin

RED CONE SPRING FAULT

201±13

18±4

1879±22

84±13

75±6

35±4

43±6

72±7

42±6

47±20

102±10

116±5

117±3

122±20

189±3

111±9

159±13

74±10

68±13

288±13

231±6

341±8

336±6

340±6

71±6

422±10

306±5

231±10

245±10

346±20

403±12

244±4

307±12

670±12

623±16

724±5

315±8

211±16

563±20

116±9

172±11

131±18

62±7

150±9

70±4

73±6

61±8

50±3

47±8

216±4

55±6

52±4

302±10

258±8

258±7

1,379±22

587±18

276±11

351±12

354±4

224±9

269±12

1853±472

276±8

137±17

153±12

109±19

605±25

448±8

416±7

355±8

155±6

415±11

87±15

1,275±14

1,088±13

1,058±16

382±8

172±15

468±9

136±8

98±8

118±48

612±8

517±15

651±28

53±4

217±16 116±24

164±11

24±3

297±12

220±67

MZI-11A

buc

awe

brw

brw

brw

brw

brw

brw

brw

brw

brw

ags

alu?

bac?

bac?

dcn

dwf

mw

s

dcp

rep

g

dcp

dlp dlp

cw

apu

dsb

cp

dlp

dcp

dwp

bwc

acr

db

g

dvb

ag?

aai

db

cp

g

rhc

ak

dcp

122°15’ 122°07’30’’ 122°

122°15’ 122°07’30’’ 122°

43° 

42°52’30’’ 

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

SCIENTIFIC INVESTIGATIONS M

SH

Pamphlet and CD-ROM acc

 

Base from U.S. Geological Survey: Welch Butte, 1967; Hamaker Butte, Pumice Desert West, Pumice Desert East,Thousand Springs, 

Crater Lake West, Crater Lake East, Pothole Butte, Red Blanket Mountain, Union Peak, Maklaks Crater, Sun Pass, 1985

Caldera floor base created by J. Robinson and D. Ramsey from multibeam echosounding data from J. Gardner and P. Dartnell 

(Gardner and others, 2001). Contour interval 40 ft (above sea level)

Geology mapped by C.R. Bacon, 1979-1995. Assisted by William Bartling, 1979, 1980; Steven Novak, 1981; Marcus Moench, 1982; C

1983; Marc Hirschmann, 1984, 1985; Anne Gartner, 1986, 1987; Maribeth Price, 1986, 1987; Simon Young, 1987, 1988; Maura Hannin

Filler, 1989; Steve McKnight, 1991, 1992; Patricia Weston, 1993; Jacob Madden, 1994; and Tracey Felger, 1995

Digital database by Dillon Dutton and Dave Ramsey

Edited by J.L. Zigler; digital cartography by Kathryn Nimz

Manuscript approved for publication April 22, 2004

Geologic Map of Mount Mazama and Crater Lake Caldera, Oregon

By

Charles R. Bacon

2008

OREGON

MAP LOCATION

1000

0 1000 2000 3000

4000 5000 6000 7000 FEET

1 .5

0 1 KILOMETER

SCALE 1:24 000

CONTOUR INTERVAL 10, 20, and 40 FEET; LAKE CONTOURS IN FEET ABOVE SEA LEVEL

1 1/2

0 1 MILE

APPROXIMATE MEAN

DECLINATION, 2008

(at center of map) MAGNETIC NORTH 15 / 1 2 TRUE NORTH °

Any use of trade, product, or firm names in this 

descriptive purposes only and does not imply e

U.S. Government

For sale by U.S. Geological Survey, Information 

Federal Center, Denver, CO 80225, or call 1–88

Available on World Wide Web at http://pubs.u