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
