preliminary geologic map of onshore portions of the ... filekjf g kjf c qt qa qh a qh a qf t qtpc qm...
TRANSCRIPT
Qmt3 Qmt4Qmt4
Qmt2
Qt
Qu
QtKJfm
Qt Qls
Qmt3
Qmt2
Qls
QhaQds
Qmt1Qmt2Qu
Qmt4Qls
Qt
KJfm
QlsQbs
Qbs
KJfmafgs Qmt4
Qbs
QaQmt1
KJfm
Qmt2
Qls
Qmt1
Qls
Qmt3
Qbs
Qt
Qls
KJfm
QlsQmt1
Qmt2
Qmt1Qbs Qmt3
Qls
KJfmQmt2
QlsKJfm Qmt3
KJfm
Qmt1
LOST M
AN FAULT
FAULT
GROG
AN
ZONE
PATRICKS POINT
FAULT
Qu
KJfm
Qmt4
Qmt3
Qmt2 Qls
Qls
Qls
Qmt1
Qmt6
Qmt1
Qls
Qa
Qmt2
Qls
MOUNTAIN
BALD
FAULT
LAGO
ON
FAULT
BIG
Qmt4
QaQls Qls
KJfm
gs
Qmt5
Qa
Qls
Qls
Qmt4
Qmt5
TRINIDAD
FAULT
mg
Qmt1
Qls
Qmt5Qls
QlsQha
Qmt1 Qmt2gs
KJfm
QlsKJfpp
Qmt5 sp
af
QuQha
KJfpp
Qmt2
Qls
mvQmt2
QlsQmt1af
Qe
QlsQeQe
Qha
Qmt4
Qha
Qls
Qe
Qha
sp
Qu
Qmt
Qls
spQt
mv
KJfm
Qt
Qmt
KJfm
Qmt
KJfm
Qls
QhtQt
Qls
Qbs
QtQaQls
KJfm
Qha
Qls
Qe
Qls
QtQlsQls
QhfQbs
QlsQht
KJfrc
KJfrc
mvQls
Qmt Qht
Qmt
mv
Qhc
Qa
Qmt
Qht
Qbs
Qmt
KJfrc
QdsQls
Qhc
Qht
mv
QhfKJfrc
Qmt
QlsQf
QscQht
Qbs
Qsc
Qha
Qhc
Qha
Qha
QhcQls
Qls Qls
Qhc
QmtQht
Qls
Qls
KJfrc
Qa
Qls
KJfg
Qmt Qhf
KJfc
Qha
KJfc
QhtQTpc
Qbs
KJfrc
KJfc
KJflQha
KJfl
Qt
KJfg
KJfc
Qt
Qa
Qha
Qha
QfQt
QTpc
Qmt
Qmt
QTpc
QaQa
Qa
Qsc
KJfbf
Qha
Qsc
Qa
KJfrc Qa
Qls
Qsc
Qbs
QhaKJfmc
Qls
QTpc
Qsc
QscKJfbf
QTpc
KJfbf
KJfmc
KJfrc
mgQsc
Qbs
Qsc
QlsQls
Qbs
KJfmc
Qls Qsc
Qsc
Qls
Qsc
Qsc
KJfmcKJfbf Qsc
Qsc
KJfmc
Qls
KJfbf
Qls
Qls
Qha
KJfrc
Qha
KJfrc
Qmt4
Qu
Qmt2
2086
24 14
24
66
54
26
15
46
76
30
22
37 20
19
6234
2344
1933
15
51
901246
9
4923
5029
4120 44
43
23
41
945
403711
40
4362
45
1
517 16
20
1012
12 24
8
15
20
24
36
5024
29
25
84
74
4240 29
743067
41
81
3660
44
49
21
40
6050
50
807
55 58
6384
67
83
4681
2525
31
3026
2240
45291541
42
2128
22
29
29
50 48
32
41
3876
19
3828
1323
413019
18
24 44
52
45
44
71
30
3943
6342
33
42
15
3632
26
37
61
5016
61269
64
60
45
30
42
10
35 33
35
32
57
30
2573
35
56
81 80
65
7552
30
34
55
10
85
45
27
32
48
23
55
42 37
38
62
82
55
28
5042
1622
30
25
31
51
53
60
38
78
16
31
2434
47
25
60
68
25
5454
22
56
30
22
30
4630
20
4751
38
15
2038
40
32
14
1845
60
31
33 46
23
27
30
41
41
30
42
37
15
20
38
36
75
37
23
2586
50
40
36
20
49
20
64
21
36
4255
42
33
15
50
33
8
30
55 10
6728
2344
13
32
36
14
21
47
42
36
38
10
25
70
42
57
45
37
24
5
39
33
86
5534
60
30
68
30
11
23
44
50
4870
40 41
34
3545
42
51
25
45
45
57
60
15
27
21
42 42
76
35
72
35
34
31
36
60
20
66
45
32
55
52
33
3743
45
45
42
6365
50
45
40
50
18
32
45
62
25
60
19
1515
4055
24 35
70
30
54
51
42
24
39
35
32
80
56
78 48
45
18
71
45
32
3438
12
34
48
46
38
16
25
30
45
68
78
54
45
Qhf Qls
Qhc
TwiQls
gr
KJfbf
Qls
Qe
gsQt
Qht
QhaKJfbf
KJfbf
JdcTwi
Qhfms
QlsQby
Qls
Qha Qhc
Twi
QhtJucQls
QlsQt
QtQhc
Qbs
Qby
QlsQa
Qha
QlsKJfbfQlsKJfbf
Qe
KJfbf
KJfbf
Qht
Qf
QdsJgb
Qe
Qht
Qe
Qls
Jdc
Qe
Qt
Qds
JgbJpd
Qha
Twi
Qt
Qf Qhc
KJfbf
Qa
sp
Jdc
af
Qha
Twi
KJfbf
KJfmc
QaTwi
spm
QfQhcQt
Qbs
Juc
Qls
Jgb
KJfmc
Tsg
KJfbf
Qf
KJfmgQf
spm
TwiJdc
Qha
Qby
Qbs
QlsTwi
TsgspmQby
Jdc
KJfbfTwiKJfbf
Qt
KJfbf Qa
Qha
Jgb
spm
Qt
QlsQls
Qbs
Tsg
Jgb
Qls Jpd
Jpd
Jdc
Qt
QhaJgb
Qt
Qhc
QlsQls
QlsQls
Qhc
Qt
Qt
Qhc
Qf Qt
JdcJdc
Qt
QlsQls
Qha
Qf
JpdJdc
Qha
Qlsaf
Qt
Qhc
Qls
Qhc
Qf
Qls
QlsKJfbf
Qht
Qhc
spm
Qby
KJfmg
spTwi
sp
Qt
Qht
grTwi
Jgb
Qha
QlsKJfbf
KJfbf
Jdc
Qa
TwiJpd
KJfbfJgbJgb
QtQf
KJfbf
KJfbf
JdcQt
Qha
Qls
Jpd
KJfbfKJfbf
QbsQls
QmtQls
Qls
Qha
gs gsaf
Qsc
Qmtu
Qls
Qls
QmtQhtQht
Qls
Qt
Qsc
Qsc
Qls
QhtQhc
af
KJfbf
Qha
chQhc
Qa
QhaQmt
Qls
QlsQls
QhaKJfbf
Qht
KJfmc QhtQht
Qha
QhcQlsQha
Qha
Qht Qha
Qbs
ch
Qlsu Qht
Qha
QtQls
ch
Qa
QlsQt
Qt Qls
ch
Qf
Qha
Qls
Qha
Qf
Qls
Qf
Qls
KJfbf
u
Qa
QhaQf
Qha
QlsQls
KJfmc
KJfbf
uQha
Qls
QhaQbs
Qhc
20
KJfmc
u QhaQhaQhc
Qlsu
KJfbf
KJfmcQls
QlsQls
Qls
KJfmcQa
QhcQlsQls Qls
Qha
Qls
KJfmg
Qt
QlsQls
Qls
Qls
QlsQtQls Qls
QlsQls
Qls
Qha
Qbs
Twi
Qls QlsKJfbf
QbyQls
Qa
QlsQls
TwiQf
QaQls
Qa
QlsQfQha
Twi
KJfbfQt
gsQa Qls
Qbs
Qbsaf
TwiKJfbfQhc
af Qha JucJpd
Jpd
af Qha
Qls
spJgb
Qls sp
Qhf Qls
KJfmg
Jpd
Jpd
Qhc
Jpd
QlsJpd
spm
Jpd
Qf
KJfmc
Qf
Qls
Jpd
Qhc
Qls
KJbf sp
Qht
Qht
Qhc
Qhc
QlsQt
Qf
Qhc
Qls
Juc
QlsKJfbf
Qha
Jpd
Qls
JPdKJfbf
QlsQls
KJfbf
Jpd
Qha
Qls
Qa Qls
Qha
Qt
Qls
Qhc
Qht
KJfbf Qls
Qbs
Qf
QlsQf
Qls
QhaQls
Qls
Qds
Qha
Qf
Qls
Qa QlsQls
Qha
Qbs
QlsKJfmc
af
Qha
QaQls
Qls
QdsQls Qls
Qls
QlsQls Qls
Jpd
Qbs
QhcQlsQls Qls
Qls
QlsQls
Qhf
Qls
QlsQls
Qht
Qby Qls
Qa
QlsQls
Qa
Qhf
Qa
QlsQfQls
QhaQa
QlsQf
Qls
Qls Qls
Jpd
Qht
Qhc
KJfbf
QlsQby
Jpd QlsQhaQls
Jgb
Jgb
Qt
Qt
KJfbf QlsQhc
QlsQhc
sp
sp
Qls
Qls Qls Qls
Qa
QlsQds
Qbs
KJfmc QlsQls
Qby
KJfbf
Qa
DE
L
N
OR
TE
FAU
LT
ROWDY CREEK FAULT
Qls
RAN
GE T
HRU
ST
RANGE
CO
AST
THRUST
COAST
ms
Qls
Qsc
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
PRELIMINARY GEOLOGIC MAP OF ONSHORE PORTIONS OF THECALIFORNIA GEOLOGICAL SURVEYJOHN G. PARRISH, Ph.D., STATE GEOLOGIST
PRELIMINARY GEOLOGIC MAP OF ONSHORE PORTIONS OF THE CRESCENT CITY AND ORICK
30' x 60' QUADRANGLES, CALIFORNIACompilation and Digital Preparation by
Marc Delattre and Anne Rosinski
2012
Copyright © 2012 by the California Department of Conservation. All rights reserved. No part of this publication may be reproducedwithout written consent of the California Geological Survey.
The Department of Conservation makes no warranties as to the suitability of this product for any particular purpose.
41°00'
42°00'
124°00'124°52'30”
124°52'30” 124°00'42°00'
Projection: Uiversal Transverse Mercator, Zone 10N, North American Datum 1927.
Topographic base from USGS Crescent City and Orick 30'x60' quadrangles, 1983. Shaded relief image derived from USGS 1/3 arc-second National Elevation Dataset (NED).
This geologic map was funded in part by the U.S. Geological Survey National Cooperative Geologic Mapping Program, STATEMAP Award no. G11AC20220.
Geology compiled 2011-2012
41°00'
STATE OF CALIFORNIA - EDMUND G. BROWN JR., GOVERNORNATURAL RESOURCES AGENCY - JOHN LAIRD, SECRETARY
DEPARTMENT OF CONSERVATION - MARK NECHODOM, DIRECTOR
41°30'41°30'
124°15'
124°15'
CRESCENT CITY
ORICK
CRESCENT CITY AND ORICK 30' x 60' QUADRANGLES, CALIFORNIA
Preliminary Geologic Map available from:http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
SCALE 1:100,000 6 Miles 2 0 2 4
2 0 2 4 6 Kilometers
Contour Interval: 50 metersAPPROXIMATE MEANDECLINATION, 2012
15.27°
TRU
E N
OR
THM
AG
NE
TIC
NO
RTH
?
27?
D
U
25
25
Contact between map units - Hashed where gradational; solid where accurately located, dashed where approximately located; short dash where inferred; dotted where concealed; queried where uncertain.
Fault - Solid where accurately located; dashed where approximately located; short dash where inferred; dotted where concealed; queried where uncertain; bar and ball on downthrown side. U = upthrown block, D = downthrown block.
Thrust fault - Sawteeth on upper plate; solid where accurately located; dashed where approximately located; short dash where inferred; dotted where concealed; queried where existance uncertain
Anticline - Solid where accurately located, dashed where approximately located; dotted where concealed.
Syncline - Solid where accurately located, dashed where approximately located; dotted where concealed.
25
25
25
?
?
25
25
SYMBOL EXPLANATION
?
Strike and dip of bedding:
Inclined
Vertical Overturned
Crumpled
Approximate
Strike and dip of foliation:
Iinclined
Vertical
Strike and dip of joints or fractures
Strike and dip if igneous layering
Strike and dip of dike walls
Landslide - arrows indicate principal direction of movement.
QU
ATE
RN
AR
YTE
RTI
AR
YC
RE
TAC
EO
US
JUR
AS
SIC
Hol
ocen
eP
leis
toce
neM
ioce
ne P
lioce
ne
ME
SO
ZO
ICC
EN
OZ
OIC
CRESCENT CITY
ORICK
Trinidad
Crescent City
0 10 205 Kilometers
0 6 123 Miles
Pacific Ocean
ABBREVIATED INDEX TO GEOLOGIC SOURCE DATA
9
6
1
5
7
3 2
4
10
11
8
tu
tu
tu
tu
0 6 12 sretemoliK3
0150 seliM5.2
(SEE PAMPHLET FOR COMPLETE REFERENCES)
1. Harper, 1980; Elder and Reichert, 2010; Evans, 1984; Stone, 1983, for Wimer Formation; Quaternary mapping by Delattre, this study.
2. Davenport, 1983b; Aalto, 1981; Quaternary mapping by Delattre, this study.
3. Davenport, 1983c; Back, 1957; Aalto and others, 1981; Quaternary mapping by Delattre, this study.
4. Davenport, 1983a; Back, 1957; Aalto and others, 1981; Stone, 1983, for Wimer Formation; Quaternary mapping by Delattre, this study.
5. Davenport, 1982; Back, 1957; Aalto, 2006, for Point St. George area; Polenz and Kelsey, 1999; Quaternary mapping by Delattre, this study.
6. Davenport, 1984a; Aalto and Harper, 1982; Wills, 2000; Ristau, 1979; Quaternary mapping by Delattre, this study.
7. Davenport, 1984b; Aalto and Harper, 1982; Quaternary mapping by Delattre, this study.
8. Aalto and others, 1981; Cashman and others, 1995; Kelsey and Trexler, 1989.
9. Dell’Osso and others, 2003; Cashman and others, 1995; Hardin and others, 1982; Aalto and others, 1981; Quaternary mapping by Delattre and Rosinski, this study.
10. Aalto and others, 1981; Quaternary mapping by Delattre and Rosinski, this study.
11. Aalto and others, 1981; Carver, 1992, Woodward-Clyde Consultants, 1980, and Aalto, 1989b for marine terraces; Quaternary mapping by Delattre and Rosinski, this study.
42°0'0"
41°30'0"41°30'0"
124°0'0"
41°0'0"124°0'0"
41°0'0"125°0'0"
42°0'0"125°0'0"
INDEX MAP OF 7.5’ QUADRANGLES
(Happy C
amp)
(Hoopa)
(Eureka)
WITHIN THE CRESCENT CITY AND ORICK 30’ X 60‘ QUADRANGLES
ch
mg
u
gr
ms
gs
gs
mv
sp
gs
Tsg
Twi
KJfm
KJfbf
KJfmc
KJfmg
KJfc
KJfg
KJfl
KJfpp
KJfrc
sp
Jdc
Jgb
Jpd
Juc
spm
Franciscan Complex - Central Belt
Mélange of the Central Belt (Late Cretaceous to Late Jurassic)
Greenstone block within mélange
Franciscan Complex - Eastern Belt
Broken formation (Early Cretaceous to Middle Jurassic)
Mélange unit of Crescent City area (Early Cretaceous to Middle Jurassic)
Blocks within mélange:
Blocks within mélange:
Greenstone
Greenstone
Metagraywacke
Chert
Undifferentiated
Transitional rocks of the Grogan Fault Zone (Cretaceous to Jurassic)
Coherent unit of Lacks Creek (Cretaceous to Jurassic)
Redwood Creek watershed units of Hardin and others (1982)
Metagraywacke (Cretaceous to Jurassic)
Incoherent unit of Coyote Creek (Cretaceous to Jurassic)
Redwood Creek Schist (Early Cretaceous to Late Jurassic)
Interbedded metatuff
Serpentinite block
Patricks Point unit of Aalto and others, 1981 (Cretaceous to Jurassic)
Klamath Mountains Province - Western Jurassic Belt
Josephine Ophiolite of Harper (1980)
Dike Complex (Late Jurassic)
Gabbro (Late Jurassic)
Cumulate ultramafic rocks (Late Jurassic)
Sheared serpentinite (Jurassic)
Serpentinite matrix mélange (Jurassic)
Granitic rocks
Metasedimentary rocks
Peridotite (Late Jurassic)
af
Qhc
Qht
Qe
Qls
Qa
Qf
Qt
Qby
Qmt
Qmt1
Qmt2
Qmt3
Qmt4
Qmt5
Qmt6
Qsc
Qu
Marine terrace deposits (Pleistocene)Trinidad marine terraces; names and approximate ages (ka=1000 years)from Woodward-Clyde Consultants (1980), and Carver (1992):
Patricks Pt. terrace, age 64 ka
Savage Creek terrace, age 83 ka, and McKinleyville terrace, age 96 ka
Westhaven terrace, 103 ka
Fox Farm terrace, 120 ka, and Sky Horse terrace, 130 ka
A-Line terrace, 176 ka and older
Maple Stump terrace, 200+ ka
Terrace gravels of Surpur Creek (Pleistocene)
Prairie Creek Formation (early Pleistocene to late Pliocene)
Undifferentiated marine and nonmarine overlap deposits (Pleistocene to late Pliocene?)
Wimer Formation (late Miocene)
St. George Formation (late Miocene)
Stream channel deposits (latest Holocene)
Beach deposits (latest Holocene)
Young alluvial deposits, undifferentiated (Holocene)
Young alluvial fan deposits (Holocene)
Dune sand (Holocene)
Estuarine deposits (Holocene)
Landslide deposits (historical to Pleistocene)
Alluvial deposits, undifferentiated (Holocene to latest Pleistocene)
Alluvial fan deposits (Holocene to Pleistocene)
Stream terrace deposits (early Holocene to Pleistocene)
Battery Formation (late Pleistocene)
Artificial fill (historical)
Young stream terrace deposits (Holocene)
ABBREVIATED EXPLANATION(Approximate stratigraphic relationships only; see pamphlet for more detailed information)
Qbs
Qds
Qha
Qhf
QTpc