Any use of trade, product, or firm names in this publication is for descriptive 

purposes only and does not imply endorsement by the U.S. Government.

For sale by U.S. Geological Survey, Information Services, Box 25286, 

Federal Center, Denver, CO, 80225, 1–888–ASK–USGS

Digital files available at http://pubs.usgs.gov/sim/2899/

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Map 2899

Sheet 2 of 3

Pamphlet and CD-ROM accompany map

Geologic Map of Lassen Volcanic National Park and Vicinity, California

By

Michael A. Clynne and L.J. Patrick Muffler

2010

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Qwh

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Qsl

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Qto Qoo

Qou

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dbl

dbc

bec

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bic

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mbg

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mm

agr

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Tdm

Taw

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Tam

Tah

Tab

Tml

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mrb

brc

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brt

brw

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br25

bre

bra

mtt

mte

mte

bss

bsd

bsl

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mee

mes

beb

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mcn

bcs

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mcm

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GLACIAL, SEDIMENTARY AND HYDROTHERMAL DEPOSITS VOLCANIC CENTERS OF SOUTHERNMOST CASCADES

NORTH AND WEST OF LASSEN VOLCANIC CENTER

Late Pleistocene volcanic rocks

Middle Pleistocene and older volcanic rocks

SOUTH AND EAST OF LASSEN VOLCANIC CENTER

REGIONAL VOLCANIC ROCKS

REGIONAL VOLCANIC ROCKS OF THE CARIBOU AREA

HOLOCENE

PLIOCENE LATE PLEISTOCENE

1,810 ka*

11.7

 ka*

125 ka*

EARLY PLEISTOCENE MIDDLE PLEISTOCENE

TERTIARY QUATERNARY

Gauss (+) Matuyama (-) Brunhes (+)

2,580 ka*

788 ka*

* Polarity Epoch and Age (ka) [nonlinear time scale]

66±4 ka

41±1 ka

~8,000 yr B.P.

27±1 ka

43±2 ka

35±1 ka

278±28 yr B.P.

1666 C.E.

 1,398±42 ka

 1,273±7 ka

 1,650±35 ka

 1,785±35 ka

 2,200±49 ka

 2,785±16 ka

 2,455±49 ka

 2,307±32 ka 2,345±49 ka

 2,575±57 ka

 2,225±49 ka

 2,350±70 ka

 1,570±35 ka

 989±49 ka

 667±24 ka 650±20 ka

362±33 ka

277±22 ka

302±36 ka

400±14 ka

 1,105±49 ka

 1,320±40 ka 

 1,080±26 ka

 1,738±46 ka

 610±22 ka

167±4 ka

172±23 ka

188±32 ka

331±45 ka

393±4 ka

302±7 ka

 69±20 ka

46.3±3.4 ka

65±45 ka 

24±6 ka

77±11 ka

67±4 ka

46±7 ka

 143±6 ka

190±18 ka

 924±24 ka

 1,645±35 ka

 1,400±37 ka

562±12 ka 

708±21 ka 

690±34 ka

 199±22 ka 

210±120 ka

 3,140±67 ka

 2,166±67 ka

 1,305±10 ka

 2,105±25 ka, 2,120±46 ka,

 2,140±42 ka, 2,259±46 ka

1,150±70 ka

1,240±110 ka

1,905±42 ka, 2,045±42 ka,

2,152±47 ka, 2,250±49 ka,

2,325±49 ka, 2,375±49 ka

467±10 ka 

 451±10 ka 

 470±10 ka

 472±9 ka 

 477±14, 485±12 ka 

473±10 ka 

 534±27 ka

 555±18 ka 

 591±13 ka 

 506±14 ka 

387±10 ka

261±5 ka

232±8 ka

212±5 ka

193±11 ka

236±1 ka

244±10 ka

249±12 ka

313±8 ka

270±18 ka

1917 C.E. 

1915 C.E. 

 1,103±13 yr B.P. 

82±14 ka

93±13 ka

297±1 ka

298±9 ka

3,310±55 yr B.P.

 1,710±42 ka

 2,315±29 ka

 672±20 ka 

 588±69 ka 

 609±7 ka 

 679±14 ka

 803±27 ka 

 812±6 ka

 827±18 ka

247±56 ka

35.1±3.1 ka

? ?

Till of Anklin Meadows

Dacite dome, May 14–19

Pyroclastic-flow and associated fluid

 debris-flow deposits, May 22

Flood deposits, May 19–20

Avalanche and debris-flow deposits, May 19–20

Dacite flow, May 19–20

Pyroclastic deposit, May 19

Pumice-fall deposit, May 22

Alluvium

Talus, emplaced

 hot from

 domes B–F

Colluvium

 and talus

Outwash gravel of Raker Peak

Till of Badger Mountain

Dome

Viscous debris-flow deposits, May 22

Avalanche deposits of Chaos Jumbles

Domes

Pumiceous pyroclastic-flow deposits

Lithic pyroclastic-flow deposit from

 partial collapse of dome E 

Lithic pyroclastic-flow deposit from Domes partial collapse of dome D A–F

Landslide

 deposits in

 hydrothermally

 altered core of

 Brokeoff

 Volcano 

Travertine

Tholeiitic basalt of 

 Eagle Canyon 

Older regional andesites and

 basaltic andesites,undivided

Pumiceous 

 pyroclastic-flow

 and fall deposits

Debris-flow deposits from the northeast side of Lassen Peak

Rocks of Latour Volcanic Center

Andesite of Raker Peak

Rhyodacite of Manzanita Chute 

Dacite of hill 8283

Dacite of Crescent Crater

Rhyodacite of Krummholz

Rhyodacite of Loomis Peak

Dacite of upper Manzanita Creek

Till or protalus-rampart debris

Late till of

 Anklin Meadows

Avalanche debris from Lassen Peak spread across glacial ice 

Post-maximum till of Raker Peak consisting of Lassen Peak avalanche debris

Lithic pyroclastic-flow deposit

 from partial collapse of dome

Dome and flow

Pumiceous pyroclastic-flow deposits

Andesite of Eagle Peak

Basaltic andesite

 of Small Butte 

Tholeiitic basalts of

 Buzzard Springs 

Tholeiitic basalt of

 Ice Cave Mountain 

Tholeiitic basalts of

 Mill Creek Plateau 

Basalts of Cold

 Creek Butte 

Andesite and basaltic

 andesite of Cluster

 Lakes 

Basaltic andesite of Little Bunchgrass Meadow

Basalt of Badger Flat 

Andesites of West

 Prospect Peak 

Andesite and basaltic andesite

 of Prospect Peak 

Tholeiitic basalt of Nobles Trail

Basaltic andesite of Box Canyon

Andesites, basaltic andesites, and

 basalts of Hat Creek Rim

Tholeiitic basalt of

 Calif. Hwy 44 

Basaltic andesite

 of Signal Butte

Andesite of Hat Mountain

Flows Rhyodacite of Kings Creek

Rhyodacite of Sunflower Flat

Pumiceous pyroclastic-flow deposits

Outwash gravel of Anklin Meadows

Till of Raker Peak

Basalts and basaltic

 andesites of Sifford

 Mountain

Rhyodacite of Dersch Meadows

Dacite of Bumpass Mountain

Dacite of Reading Peak

Dacite of Ski Heil Peak 

Dacite of

 Vulcans Castle

Dacite of Lassen Peak parking lot

Dacite of Mount Helen 

Dacite under Mount Helen 

Basaltic andesite of

 Huckleberry Lake 

Andesite of Viola

Rhyodacite of Mount Conard 

Andesite of Glassburner Meadows

Dacite of Twin Meadows

Andesite of Mount Diller

Andesites of

 Mill Canyon

Andesite of Digger Creek

Andesite of Rice Creek

Andesite of Bluff Falls quarry

Debris-flow deposit

 from Brokeoff Volcano

Andesites of Diller

 sequence, undivided

Andesite of

 Manzanita Creek

Andesite of Ashpan Butte

Basaltic andesites of

 Magee Volcano 

Andesite of Grayback Ridge 

Andesite of Logan Mountain

Dacite of Huckleberry Mountain

Andesite of

 Table Mountain 

Basalt of

 Cherry

 Thicket 

Basalt of Butte

Creek Campground

Basaltic andesite of Hootman Ranch

Andesites of Badger Mountain

Tholeiitic basalt of Twin Bridges

Basalts and basaltic

 andesites of Swains Hole

Andesite of Wilcox Peak

Andesites of Cowslip Campground

Dacites of Maidu Volcanic Center,

 Stage 2, undivided 

Andesites of Maidu

 Volcanic Center,

 Stage 1, undivided

Andesites of Wild

 Cattle Mountain

Andesite of Martin Creek 

Andesite of Cabin Spring

Andesite of Onion Creek

Basaltic andesite of Rock Spring

Basaltic andesites of

 Camp Forward

Basaltic andesite of Grays Peak

Basaltic andesites of South Fork Battle Creek

Basalt of Panther Creek

Tuscan Formation

Andesites of Hampton Butte

Andesite of South Fork Battle Creek

Basaltic andesite of Lassen Lodge

Andesites of Dittmar Volcanic

 Center, Stage 1, undivided

Andesites of Dittmar

 Volcanic Center,

 Stage 2, undivided

Rhyolites of Dittmar

 Volcanic Center, Stage 3

Hat Creek Basalt

 (tholeiitic)

Avalanche deposit

 from dacite of

 hill 8283

Lithic tephra from

 Deep Hole 

Andesite of Tumble Buttes

Andesite of Devils Rock Garden

Basaltic andesite of section 5

Basaltic andesite of Bear Wallow Butte 

Basaltic andesite of hill 6138 

Andesite of Bear Wallow Butte 

Basaltic andesite of hill 6770 

Basaltic andesite

 of Tumble Buttes 

Basaltic andesite of hill 5410 

Basaltic andesite of Mud Lake

Basaltic andesite

 of Eskimo Hill 

Basaltic andesite of Red Mountain

Basaltic andesite and andesite

 of Red Lake Mountain

Tholeiitic basalts of

 Big Lake (units 1–2) 

Andesite of Sugarloaf Peak

Andesite of Potato Butte

Basaltic andesite of

 Little Potato Butte 

Basaltic andesite of hill 4709

Andesites of Old Station

Mill Canyon

sequence

Stage 2

Eagle Peak sequence

Rhyolite of

 Blue Ridge

Rhyolite of Mill

 Creek Plateau

Rhyolite of Lost

 Creek Plateau

Rhyolite of

 North Stover

 Mountain

Rhyodacite of

 Gurnsey Creek

Outwash

 gravel,

 younger 

 glaciations

Outwash

 gravel,

 undivided

Till, younger

 glaciations

Outwash

 gravel,

 older

 glaciations

Outwash gravel,

 undivided

Till, older

 glaciations

Andesite and basalt

 of Mount Harkness

Basalts and basaltic andesites

 of Mud Creek Rim

Andesite of

 Domingo

 Spring

Basaltic andesites of Swain Mountain

Tholeiitic basalt of Rock Creek

Basaltic andesites

 and basalt of

 Snag Lake

Andesite

 of Benner

 Creek

Andesite

 of Doe

 Mountain

Andesite of Cal Mountain

Basalt of section 11

Basaltic andesite of Cone Mountain

Tholeiitic basalt

 of Grays Valley

Tholeiitic basalt

 of hill 1879 

Dacite of Bogard Buttes

Basaltic andesites

 of Susan River 

Basalts of Sunrise Peak (Units 1–2)

Basalt of Duck Lake

Basalt of Lost Spring

Andesite of Butte Lake

Basalt of Bathtub Lake

Basalt of hill 8030

Basalt of Cameron Meadow

Basaltic andesites of Echo Lake (Units 1–2)

Basaltic andesite of Star Butte

Basalts of Bond Valley (Units 1–3)

Basaltic andesites of

 Silver Lake (Units 1–11)

Basaltic andesites of North Caribou (Units 1–8)

Basalt of South Caribou

Basalt of Indian Meadow

Basaltic andesite

 of Jewel Lake

Basaltic andesite

 of Rim Lake

Basaltic andesite

 of Eleanor Lake

Basaltic andesite of middle Caribou

Andesite of Red Cinder

Basaltic andesite

 of Turnaround Lake

Basaltic andesites of Long Lake (Units 1–3)

Basalt of Posey Lake

Older basalts and basaltic andesites

 south of Caribou Volcanic Field

Basalt of

 East Lake

Basaltic andesite of

 Black Cinder Rock

Tholeiitic basalt of

 Warner Valley

Basaltic andesite of Hay Meadow

Basalt of Cowboy Lake

Andesite of section 16

Basalt of

 Caribou

 Wilderness

Andesite of section 22

Basaltic andesites

 of Evelyn Lake

Basaltic andesites

 of Evelyn Lake

Basaltic andesite of Red Cinder

Basaltic andesite of Caribou Wilderness

Basalt of Red Cinder Cone

Basaltic andesite of Red Cinder Cone

Basalt of Beauty Lake

Basalt of Hidden Lakes

Basaltic andesite of hill 7114

Basalt of Bonte Peak

Basalt of

 Island Lake

Basaltic andesite

 of Jakey Lake

Basalt of

 Caribou Peak

Basaltic andesite of Triangle Lake

Basaltic andesites of section 20

Basalts of Triangle Lake (Units 1–2)

Basalt of Widow Lake

Basaltic andesites of Black Butte (Units 1–2)

Basalt of Twin Buttes

Basaltic andesite of Pole Spring Road

Basaltic andesite of section 36

Basalt of Butte Creek Ranch

Andesite of Bidwell Spring

Basalt of hill 2283

Basalt of section 25

Basalt of hill 7243

Basalt east of Ash Butte

Basalt of Ash Butte

Caribou

sequence

Caribou

chain

Tuya

chains

Echo

Lake

sequence

Triangle

Lake

sequence

Basaltic andesite of Fairfield Peak

Andesite of Crater Butte

Diller

sequence

Brokeoff Volcano Rockland caldera complex

Basaltic plug near Heckle Ranch

?

?

?

Rhyodacite of section 27

Basalt of Onion Springs

Diatomite

? 

? ? ? 

? ? 

Andesite of hill 7416

Twin Lakes sequence, older

Lassen domefield

Twin Lakes sequence, younger

Bumpass

sequence

Tumble

Buttes

chain

Sugarloaf

chain

Bidwell

Spring

chain

Red

Cinder

chain

Sunrise

Peak

sequence

Island

Lake

sequence

Beauty

Lake

sequence

Flow 2 Fantastic

Lava Beds Flow 1

Flow 2

Painted

Dunes Flow 1

Old Bench flow

Basaltic andesites of Cinder Cone

Deposits of 1914–1917 eruption of Lassen Peak

Older volcanic rocks

?

Rhyodacite of

Chaos Crags

Dacite of Lassen Peak

Rhyodacite of Eagle Peak

Stage 3 Stage 1

Stage 2 Stage 3 Stage 1

?

?

Dacite of

 Summit Creek

? 

?

Talus on

 Lassen Peak

Dacite of Flatiron Ridge

Rhyolite of Raker Peak

Dacite of Red Rock Mountain

Dacite of Rocky Peak

Dacite of Bailey Creek

Rockland tephra

Dacite of Panther Creek

Dacite of

 Plantation Gulch

Dacite of

 Christie Hill

Dacite of

 Morgan Mountain

Dacite of

 Canyon Creek

Dacite of Bench Lake

CORRELATION OF MAP UNITS HEADNOTE

[See Description of Map Units (pamphlet) for detailed unit descriptions and interpretation of unit ages; ages shown may be averages of several ages. See table 2 and references in unit descriptions for age analysis information. 

Units of volcanic centers and the Caribou Volcanic Field are shown on colored backgrounds for emphasis. Sequences are groups of volcanoes related by lithology and age. Chains are sequences displaying conspicuous linear 

geometry. Indentations in left margin of Lassen Volcanic Center area indicate intercalations with glacial and surficial units. Age boundaries based on Gradstein and others (2005) and Walker and others, 2009. Paleomagnetic 

polarity (+, normal; -, reversed) boundaries based on Berggren and others (1995). C.E., Common Era. Unit age is left of unit box; unit name is right of unit box. Some unit boxes represent groups of units, such as the unit box 

labeled bb, which is not a unit on the map. A note in parentheses to the right of the unit name shows that the box represents units bb1–bb6 and bb8–bb12. Colored arrows pointing up and down from unit boxes indicate the 

possible range in age of unit. See table 3 for alphabetical listing of map unit labels, as well as unit name, page number of unit description in pamphlet, unit age, location by heading in Correlation of Map Units, and quadrangle 

location in database] 

Hydro-

 thermally

 altered rocks

 in active

 thermal areas

Phreatic deposit, May–June

97.6±9.8 ka

105.0±6.0 ka

107.5±3.8 ka

100.1±8.5 ka

106.2±3.6 ka

101.0±1.9 ka

108±14 ka

108.6±2.1 ka

110.8±3.8 ka

102.1±11.4 ka

101.5±8.7 ka Basalts of Robbers Spring (Units 1–5)

Basalts and basaltic andesites

 of Bogard Buttes (Units 1–6; 8–12)

Basalts of Pittville Road (Units 1–4)

Basalts of Poison Butte (Units 1–6)

Basalts of old railroad grade (Units 1–4)

Basalts of Cone Lake Road (Units 1–2)

Basaltic andesite west of hill 2078

Basalts of Pine Creek (Units 1–3)

Basalts of Stephens Campground (Units 1–5)

Poison

Lake

chain

220±14 ka

202.0±2.2 ka

Basaltic andesite of hill 1868

Basalt of section 30

Basalt of hill 2109

Basaltic andesites of Cone Lake

Basalt of hill 2232

Basalt of section 35

Basalt of section 2 Basalt of hill 2088

Cone

Lake

chain