Base from U.S. Geological Survey, 1979Universal Transverse Mercator projection

Geology compiled in 1989–91; GIS compilationby J.D. Cecil, 1994–5

Edited by Taryn A. Lindquist and Sean M. Stone;digital cartography by Taryn A. Lindquist, with assistance from Sara Boore, Susan Mayfield, andDavid Lanford

Manuscript approved for publication March 6, 1995

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

GEOLOGIC INVESTIGATIONS SERIESMAP I–2542

Pamphlet accompanies map

1 10 KILOMETERS0 1 2 43 5 6 7 8 9

SCALE 1:100 0001 8 MILES10 2 3 4 5 6 7

APPROXIMATE MEANDECLINATION, 1999

MA

GN

ET

IC

NO

RT

H

16 / °12

TR

UE

N

OR

TH

CONTOUR INTERVAL 50 METERSWITH SUPPLEMENTARY CONTOURS AT 10–METER INTERVALS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

GEOLOGIC MAP OF THE RED BLUFF 30' × 60' QUADRANGLE, CALIFORNIABy

M.C. Blake, Jr., D.S. Harwood, E.J. Helley, W.P. Irwin, A.S. Jayko, and D.L. Jones1999 For sale by U.S. Geological Survey, Map Distribution,

Box 25286, Federal Center, CA 80225

Pleistocene and(or) Pliocene

Holocene andPleistocene

Qls

Sedimentary rocks

SACRAMENTO VALLEY–CASCADE RANGE PROVINCE

t

Qsc Qo Qao Qb

Qrb

QTog

Tten

Tc

Tte

Qru

Qrl

Qmu

Qml

Qeb

Qbd

Qcb

QTa

Ttd

Ttc

Tti

Qsf3 Qsf1

Qip Qiu

QbbQbc

Qtbb

Qab

Qr

Qsf2

Tth

Ttu

Ttb

Tta

Ttn

Taa

Qa

Volcanic rocks

SACRAMENTO VALLEY–WESTERN FOOTHILLS

PROVINCE COAST RANGES PROVINCE KLAMATH MOUNTAINS PROVINCE

Qg

Qls

QTog

Holocene

Pliocene

Pleistocene

Holocene and(or) Pleistocene

Pliocene and(or) Miocene

QUATERNARY AND(OR) TERTIARY

TERTIARY

QUATERNARY

JURASSIC ANDTRIASSIC

JURASSIC AND(OR) TRIASSIC

Late Jurassic

whpwcpx

Kc

Koms Koss

ch ch ch

mvppv**

mbppsm**

ecg ecugb

ecsp

ecssecms

spgs

ybt* ybc ybh ybdsrv*srs*

Ko

whpbwhuwh4wh3wh2wh1 whpo* whpg*

Ksb

lseh*sp

rcp* rcum*rcm*ls

rcds*

Fault

Fault

nfsls

nfum

Fault

cm

Fault

ekrb

ekrc

Fault

ektr

Middle Jurassic

Late Cretaceous

Early Cretaceous

JURASSIC

CRETACEOUS

ORDOVICIAN

DEVONIAN

MISSISSIPPIAN

DEVONIAN

PERMIAN

CORRELATION OF MAP UNITS[*See List of Map Units for precise unit ages; **Age shown is metamorphic age (protolith age unknown)]

LIST OF MAP UNITS[See Description of Map Units (in pamphlet) for complete unit descriptions]

SACRAMENTO VALLEY–CASCADE RANGE PROVINCE

Sedimentary rocks

Dredge tailings (Holocene)

Stream channel deposits (Holocene)

Alluvium (Holocene)

Overbank deposits (Holocene)

Alluvial and overbank deposits, undivided (Holocene)

Basin deposits (Holocene)

Modesto Formation (Pleistocene)—Divided into:

Upper member

Lower member

Riverbank Formation (Pleistocene)—Divided into:

Upper member

Lower member

Red Bluff Formation (Pleistocene)

Older gravel deposits (Pleistocene and (or) Pliocene)

Tehama Formation (Pliocene)—Locally includes:

Nomlaki Tuff Member

Channel deposits (Pliocene and (or) Miocene)

Chico Formation (Late Cretaceous)

Volcanic rocks

Basaltic rocks of Inskip Hill volcanic center (Holocene)—Divided into:

Basalt flow of Paynes Creek

Basalt flows of Inskip Hill and Soap Butte, undivided

Basaltic rocks of Black Butte volcanic center (Holocene)—Divided into:

Cinder deposits

Basalt flow of Black Butte

Basalt near Tuscan Buttes (Holocene and (or) Pleistocene)

Hypersthene andesite of Brokeoff Mountain (Pleistocene)

Rockland ash bed of Sarna-Wojcicki and others (1982) (Pleistocene)

Basalt flows of Shingletown Ridge (Pleistocene)—Divided into:

Flow 3

Flow 2

Flow 1

Olivine basalt of Eagle Canyon (Pleistocene)

Olivine basalt of Devils Half Acre (Pleistocene)

Basalt of Coleman Forebay (Pleistocene)

Andesite (Pleistocene and (or) Pliocene)

Tuscan Formation (Pliocene)—Divided into:

Undivided part

Member D

Tuff member of Hogback Road

Member C

Ishi Tuff Member

t

Qsc

Qa

Qo

Qao

Qb

Qmu

Qml

Qru

Qrl

Qrb

QTog

Tte

Tten

Tc

Kc

Qip

Qiu

Qbc

Qbb

Qtbb

Qab

Qr

QsfG

QsfF

QsfE

Qeb

Qbd

Qcb

QTa

Ttu

Ttd

Tth

Ttc

Member B

Member A

Nomlaki Tuff Member

Basaltic andesite of Antelope Creek (Pliocene)

SACRAMENTO VALLEY–WESTERN FOOTHILLS PROVINCE

Overlap assemblage (Late and Early Cretaceous)—Divided into:

Mudstone

Sandstone and conglomerate

Elder Creek terrane—Divided into:

Mudstone (Early Cretaceous and Late Jurassic)

Sandstone and conglomerate (Early Cretaceous and Late Jurassic)

Coast Range ophiolite (Late and Middle Jurassic)—Divided into:

Layered gabbro

Layered ultramafic rocks

Round Mountain serpentinite melange and blocks of gabbro

COAST RANGES PROVINCE

Landslide deposits (Holocene and Pleistocene)

Glacial deposits (Pleistocene)

Pickett Peak terrane—Divided into:

South Fork Mountain Schist and large bodies of metabasalt (Early Cretaceous, metamorphic age; protolith age unknown)

Valentine Spring Formation of Worrall (1981, 1982) and minor amounts of meta-volcanic rock (Early Cretaceous, metamorphic age; protolith age unknown)

Yolla Bolly terrane—Divided into:

Taliaferro Metamorphic Complex of Suppe (1972) (Early Cretaceous to Middle Jurassic?)

Chicago Rock melange, blocks of greenstone, and lenses of chert (Early Cretaceous to Middle Jurassic)

Metagraywacke of Hammerhorn Ridge, lenses of chert, and scarce serpentinite (Early Cretaceous to Middle Jurassic)

Broken formation of Devils Hole Ridge and blocks and lenses of chert (Early Cretaceous to Middle Jurassic)

KLAMATH MOUNTAINS PROVINCE

Landslide deposits (Holocene and Pleistocene)

Older gravel deposits (Pleistocene and (or) Pliocene)

Overlap assemblage (Early Cretaceous)

Shasta Bally batholith (Early Cretaceous)

Western Klamath terrane—Consists of:

Smith River subterrane—Divided into:

Metasedimentary rocks (Late Jurassic?)

Metavolcanic rocks (Late Jurassic?)

Hayfork terrane—Consists of:

Western Hayfork subterrane of Wright (1982) (Middle Jurassic)—Divided into:

Unit 1

Unit 2

Unit 3

Unit 4

Undivided part

Plutonic rocks—Divided into:

Basin Gulch pluton (Middle Jurassic)

ybt

ybc

ybh

ybd

Qls

QTog

Ko

Ksb

srs

srv

whE

whF

Walker Point and Wildwood plutons, undivided, and core of clinopyroxenite (Middle Jurassic)

Oliphant Creek pluton (Jurassic?)

Granite (Jurassic?)

Eastern Hayfork subterrane of Wright (1981, 1982) and blocks of limestone and serpentinite (Middle? Jurassic)

Rattlesnake Creek terrane—Divided into:

Melange and blocks of limestone (Jurassic and older)

Dike and sill complex (Early Jurassic and (or) Late Triassic)

Plutonic rocks (Early Jurassic and (or) Late Triassic)

Ultramafic rocks (age unknown)

North Fork terrane—Divided into:

Volcanic and sedimentary rocks and blocks of limestone (Jurassic to Permian)

Ultramafic rocks (Permian)

Central metamorphic terrane (Devonian, metamorphic age)

Eastern Klamath terrane—Consists of:

Redding subterrane—Divided into:

Bragdon Formation (Mississippian)

Copley Greenstone (Devonian)

Trinity subterrane (Ordovician)

Contact—Dashed where approximately located; dotted where concealed; queried where uncertain

Steeply dipping fault—Dashed where approximately located; dotted where concealed; queried where uncertain. Arrows indicate direction of relative movement

Thrust fault—Dashed where approximately located; dotted where concealed; queried where uncertain. Sawteeth on upper plate

Attenuation fault—Hachures on downthrown block

Fold axes—Showing direction of plunge where known

Anticline

Antiform

Dome

Syncline

Basin

Monocline

Approximate location of stage boundary

Strike and dip of bedding

Inclined

Inclined, top known—Shown in Klamath Mountains and Coast Ranges provinces only

Vertical

Overturned

Strike and dip of foliation

Inclined

Vertical

Strike and dip of foliation parallel to bedding

Inclined

Strike and dip of semiplanar structure in melange—Shown in Klamath Mountains province only

Inclined

Landslide arrow—Shows direction of movement of landslide

whpw

whpo

whpg

eh

rcm

rcds

rcp

rcum

nfs

nfum

cm

ekrb

ekrc

ektr

Taa

Koms

Koss

ecms

ecss

ecg

ecu

ecsp

Qls

Qg

ppsm

ppv

gb

Ttb

Tta

Ttn

Tti

whG

whI

whu

whpb

ch

gs

ch

sp

ch

cpx

ls

ls

sp

ls

mv

mb

Figure 1. LANDSAT image centered on northern Sacramento Valley, showing location of geologic map of Red Bluff 30' × 60' scale quad-rangle (dashed white outline; width approximately 85 km) in relation to geologic provinces in northern California. Abbreviations: CFB, Central belt (Franciscan Complex); EC, Elder Creek terrane (Great Valley province); EFB, Eastern belt (Franciscan Complex); K, Cre-taceous overlap assemblage (Great Valley province); LP, Lassen Peak; R, city of Redding; RB, city of Red Bluff; SR, Sacramento River.

RB

K

R

EFB

SIERRANEVADA

CFB

EC

LP

SR

KLA

MATHMOUNTAINS C

AS

CA

DE

RA

NG

E

COAST

RANGES

RB

K

R

EFB

SIERRANEVADA

CFB

EC

LP

N

SR

KLA

MATHMOUNTAINS C

AS

CA

DE

RA

NG

E

COAST

RANGES

123°00'40°30'

123°00'40°00'

40°15' 40°15'

40°30'

40°00'122°00'

122°00'122°15'

122°30'122°45'

122°15'122°30'122°45'

122°45'123°00'

0 15 KILOMETERS

40°30'

40°15'

40°00'

122°30'

Yolla BollyJunction

EXPLANATION

Cenozoic and Cretaceous overlap deposits, undivided

Elder Creek terrane

COAST RANGES PROVINCE

Pickett Peak terrane

Yolla Bolly terrane

KLAMATH MOUNTAINS PROVINCE

Shasta Bally batholith

Western Klamath terrane—Divided into:

Smith River subterrane

Hayfork terrane—Divided into:

Western Hayfork subterrane

Eastern Hayfork subterrane

Rattlesnake Creek terrane

North Fork terrane

Central metamorphic terrane

Eastern Klamath terrane—Divided into:

Redding subterrane

Trinity subterrane

Contact

Fault

Figure 3. Simplified terrane map of western part of Red Bluff 30' × 60' quadrangle, showing location of Yolla Bolly junction.

EXPLANATION

Bailey and Jones, 1973

Blake, 1965

Blake and others, 1984

Harwood and others, 1980

Harwood and others, 1981

Helley and others, 1981; see also, Helley and Harwood, 1985

Huber and others, 1983

Maytom, 1967

Murphy and others, 1969

Gary Peterson, unpub. mapping, in Murphy and others, 1969

Worrall, 1981

Wright, 1981

CHANCHELULLA PEAK ONO ANDERSON TUSCAN BUTTES

RED BLUFFRED BANKCOLYEAR SPRINGSYOLLA BOLLY

122°45'40°30'

40°15'

40°00'

122°30' 122°15' 122°00'123°00'

Figure 2. Index to sources of geologic mapping and 15' quadrangles (dashed line, quadrangle boundary) in Red Bluff 30' × 60' quadrangle.

INTERIOR—GEOLOGICAL SURVEY, RESTON, VA—1999

CALIF.

MAP LOCATION