Preliminary Geologic Map available from: PRELIMINARY ... · Jv KJgvs Jd Jv 0 0 0 1 1.5 1.5 2 2 2...
Transcript of Preliminary Geologic Map available from: PRELIMINARY ... · Jv KJgvs Jd Jv 0 0 0 1 1.5 1.5 2 2 2...
73
73
49
67
50
40
55
60
36
7060
3320
15
50
70
45
76
80
55
61
66
6270 12
70
18
35
44
7018
65
28
37
30
50
30
1635
53 5137
48
3
75
4167
2241
50
64
80
56
45
55
50
50
80
50
65
45
75
75
70
35
75
50
50
45
20
80
65
15
80
80
40
70
45
Qpt
Qpt
Qhc
Qhc
Qhc
Qha
KJfc
Qa
Qhc
sc
Qhc
Qhc
Qhc
Qhc
QptQhc
Qa
QaQhc
Qa
Qhc
alf
KJgvsalf
Qhfalf
Qhay
Qhay
alfalf
alf QhaQhc
Qhay
Qhayalf
alf
Qhf
KJgvc
Qpaalf
alf
Qa
Kfss
KJfs
Qha
sc
Qpf
Kfss
Qls
Tsvb
KJfs
adf
sc
Qa
KJgvs
Qls gsKJfm
KJgvs
KJfmg
Qpt
Jd
KJgvs
Jd
QaJd
Kfgwy
KJfmg
Jd
Jfgs
KJfc
Kfgwy
sp
sp
sp
KJfc
Jfgs
KJfc
KJfc
Jfgs
spJfgs
Jfgs
KJfc
spKJfc
Qls
KJfms
sp
chsp
spQls
TKfs
KJfms
KJfcKJfcKJfcKJfc
Kfgwy
KJfc
KJgvs
Qpt
Qpt
sp
sp
gs
KJgv
KJfs
sp
Qf
sp
sp
m
sp
ch
Qpa
gs
Tsvb
Tsvb
gs
chQls
KJfs
Jfgs
sp
Qls
m
Qhf
Qa
Qls
Kfss
gsQpa
chsp
Qpf
Jd
sp
KJgvs
Qf
Qhf
Qhf
Qhfy
QTg?
QaQf
sp
Qf
sp
QtJfgs
Qt
Jfgs
QptQTg?
QTg?
Qa
sp
QptQpt
KJgvs
QTg?
Qt
Qt
Qoa
Qf
Jfgs
KJfs
KJfms
Kfgwy
Qls
KJfs
KJfs
Jd
KJgvs
Jd
Jv
Kfgwy
Qha
Qt
Qpt
Qha
Qhf
Qhay
Qt
Qpt
Qha
Qt
QTg?
Qa
sc
sp
KJfm
Tsvb
Kfss
KJfs
gs
sp
gsKJfs
spm
KJgvs
Qa
Qa
KJgvc
KJgvs
QTg?
Jd
QTg?
Qls
Kfss
Qhf
Qhay
Qhc
Qhc
Qhay
Qhc
Qhc
KJgvs
Qhc
Qha
Qhay
Qhay
Qha
Qhf
Qhay
Qhf
Qhay
Qha
Qhf
Qhay
Qha
Qhay
Qhc
Qhc
Qhay
Qhay
Qhay
Qhc
Qha
Qha
Qha
Qhay
Qha
Qhay
Qhf
Qhay
KJgvs
Qhc
Qhc
QhcQhc
Qha
Qhay
Qhc
Qhay
adf
Qa
QTg?
m
KJgvs
Qls
Qls
Qls
sp
spQls
Qls
Qoa
KJgvs
KJgvs
KJgvs
QTg?
KJgvc
KJgvc
KJgvc
KJgvc
Qls
Qls
Jv
KJgvs
Jd
Jv
0
0
0
1
1
1.5
.5 2
2
2Thousand Feet
Kilometers
Miles
Scale 1:24,000
Contour Interval 40 feetSupplementary Contour Interval 10 feet
National Geodetic Vertical Datum of 1929
UTM GRID AND 2012 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
MNGN
249 MILS1 MIL
141/3° 0°02’
USGSSIM-2858
(Na(Na(Na(Na(Na(Na(Napa)pa)pa)pa)pa(Na(Na(Na(Na(N(NN pa)pa)pa)pa)aa
(Sa
(Sa
(S(Saacramm
entoo))
(La(La(La(Lakepkepkepkepkepk ortortortortrt)))))(La(La(La(Lakepkepkepkekkeportortortortt))))p
nananana)))
Ar
Ar
Ar
Ar
Aenenenen
Po
Po
Po
Po
Pooi
ntint
int
int
int
int
(P(P(P(P(PPo
(Pa)
RUSSIAN R
NAPA R
LakeHennessey
LakeBerryessa
LakeSonoma
C learLake
Yountville
WintersWindsor
Sebastopol
PopeValley
Occidental
MonteRio
Kelseyville
Healdsburg
Geyserville
Forestville
Esparto
Cloverdale
ClearlakeOaks
Calistoga
Arbuckle
Angwin
Jimtown
LakeLower
101
175
128
20
12
29
53281
16
116
121
505
5
5 Kilometers5 Miles
JIMTOW
N
HEALDSBURG
MARK WEST
SPRINGS
HIGHLA
ND
SPRINGS
ASTI
GEYSERVILLE
GUERNEVILLE
KELSEYVILL
E
THE
GEYSERS
CLEAR LA
KE
HIGHLA
NDS
WHIS
PERING
PINES
MOUNT
SAINT H
ELENA
LOW
ER LAKE
MIDDLE
TOWN
CALISTOGA
WILS
ON VALL
EY
JERIC
HO VALL
EY
AETNA SPRIN
GS
SAINT H
ELENA
DETERT
RESERVOIR
GLASCOCK M
TN
WALT
ER SPRIN
GS
RUMSEY
KNOXVILLE
CHILES V
ALLEY
GUINDA
BROOKS
LAKE B
ERRYESSA
WILD
WOOD
SCHOOL
BIRD V
ALLEY
MONTICELL
O DAM
ESPARTO
Colusa CountyYolo County
Mendocino CountySonoma County
Lake County
Napa County
Solano County
Napa County
123° 122°39°
38°30’
Mapping completed under STATEMAP
FY 2009-10 Current project
FY 2010-11
Geyserville 7.5-Minute Quadrangle122°52'30"123°00'
38°45'
38°37’30”
SOURCES OF MAP DATA
1. Quaternary geology from Gutierrez, this study; partially modified from Knudsen and others, 2000.
2. Bedrock geology compiled and modified from Blake and others, 2002; Gealey, 1951.
1
1
1
1
2
2
2
Blake, M.C., Graymer, R.W., and Stamski, R.E., 2002, Geologic map and map database of western Sonoma, northernmost Marin, and southernmost Mendocino Counties, California: U.S. Geological Survey, Miscellaneous Field Studies Map MF-2402, scale 1:100,000.
Blake, M.C., Irwin, W.P., and Coleman, R.G., 1967, Upside-down metamorphic zonation, blueschist facies along a regional thrust in California and Oregon: U.S. Geological Survey Professional Paper 575-C, pp. 1-9.
Blake, M.C., Wright, R.H., and Wentworth, C.M., 1971, Preliminary geologic map of western Sonoma County and northernmost Marin County, California: U.S. Geological Survey, Open-File Report OF-71-44, scale 1:62,500.
Bryant, W.A., 1982, Fault Evaluation Report FER-135, Chianti, Healdsburg, Alexander, Maacama, and related faults: California Division of Mines and Geology, 21p.
California Division of Mine and Geology, 1983, Geyserville quadrangle, Special Studies Zones, revised official map: State of California, effective July 1, 1983, 1 sheet, scale 1:24,000.
Cardwell, G.T., 1958, Geology and groundwater in the Santa Rosa and Petaluma Valley areas, Sonoma County, California: U.S. Geological Survey Water Supply Paper 1427.
Delattre, M.P., and McLaughlin, R.J., 2010, Geologic Map of the Jimtown 7.5’ quadrangle, Sonoma County, California: California Geological Survey, scale 1:24,000; http://www.conservation.ca.gov/cgs/maps/Pages/Maps.aspx.
Delattre, M.P., 2011, Preliminary Geologic Map of the Healdsburg 7.5’ quadrangle, Sonoma County, California: California Geological Survey, scale 1:24,000; http://www.conservation.ca.gov/cgs/maps/Pages/Maps.aspx.
Gealey, W.K., 1951, Geology of the Healdsburg quadrangle, California: California Division of Mines Bulletin 162, 50 p., Plate 1, scale 1:62,500.
Huffman, M.E., and Armstrong, C.F., 1980, Geology for planning in Sonoma County, California: California Division of Mines and Geology Special Report 120, 31 p., scale 1:62,500.
Knudsen, K.L., Sowers, J.M., Witter, R.C., Wentworth, C.M., and Helley, E.J., 2000, Preliminary maps of Quaternary deposits and liquefaction susceptibility, none-county San Francisco Bay region, California: A digital database: U.S. Geological Survey Open-File Report 00-444, scale 1:24,000; http://pubs.usgs.gov/of/2000/of00-444/
McLaughlin, R.J., Langenheim, V.E., Sarna-Wojcicki, A.M., Fleck, R.J., McPhee, D.K., Roberts, C.W., McCabe, C.A., and Wan, Elmira, 2008, Geologic and geophysical framework of the Santa Rosa 7.5’ quadrangle, Sonoma County, California: U.S. Geological Survey Open-File Report 2008-1009, 51 p. http://pubs.usgs.gov/of/2008/1009/
McLaughlin, R.J., and Sarna-Wojcicki, Andrei, 2003, Geology of the right step-over region between the Rodgers Creek, Healdsburg, and Maacama faults, Northern San Francisco Bay Region - A contribution to northern California Geological Society Field Trip Guide, June 6-8, 2003: U.S. Geological Survey Open-File Report 03-502, 23 p. http://pubs.usgs.gov/of/2003/of03-502/
Metzger, L.F., Farrar, C.D., Koczot, K.M., and Reichard, E.G., 2006, Geohydrology and Water Chemistry of the Alexander Valley, Sonoma County, California: U.S. Geological Survey Scientific Investigations Report 2006-5115, 83 p.
Witter, R.C., Knudsen, K.L., Sowers, J.M., Wentworth, C.M., Koehler, R.D., and Randolph, C.E., 2006, Maps of Quaternary deposits and liquefaction susceptibility in the central San Francisco Bay Region, California: U.S. Geological Survey Open-File Report 2006-1037, scale 1:24,000; http://pubs.usgs.gov/of/2006/1037/
SELECTED REFERENCES
Inclined
Vertical
Overturned
SYMBOL EXPLANATION
Contact between map units – Solid where accurately located; dashed whereapproximately located; dotted where concealed, queried where uncertain.
Landslide - arrows indicate principal direction of movement.
Fault – Solid where accurately located, dashed where approximately located;short dash where inferred; dotted where concealed; queried where uncertain.
?
?
Strike and dip of beds25
25
KJfmg
Kfss
Jfgs
KJfsKJfcKfgwy
alfadfaf Qhc Qhay QhfyQha
Qpa
QaQls
Qoa ??
?
Qhf
Qpf
Qf
? Qpt
Qt
?
scQTg Tsvb?
Franciscan Complex
?
??
Holocene
Pleistocene
Pliocene
QUATERNARY
TERTIARY
CORRELATION OF MAP UNITS
Great ValleySequence
Coast Range Ophiolite
spJv Jd spm
KJgvKJgvc
KJgvs
KJfmsCRETACEOUS
JURASSIC
TKfs
KJfm
?
ch
gs
m
Artificial fill (historical) – May be engineered and/or non-engineered
Artificial dam fill (historical) – Earth dams, rock-fill dams, and embankments constructed to impound water. May be engineered and/or non-engineered.
Artificial levee fill (historical) – Artificial levees constructed along rivers and streams to control flood waters. May be engineered and/or non-engineered.
Stream channel deposits (modern to latest Holocene) – Fluvial deposits within active, natural stream channels; composed of loose sand, silt, and gravel.
Alluvial deposits, undivided (latest Holocene) – Fluvial sediment deposited on the modern flood plain; composed of loose sand, silt, clay and gravel.
Alluvial fan deposits (latest Holocene) – Alluvial fan sediment deposited on the modern alluvial valley. Sediments are typically moderately to poorly sorted and bedded, and consist of gravel, sand, silt, and clay.
Alluvial deposits, undivided (Holocene) – Alluvium deposited in fan, terrace, or basin environments that could not be readily separated for mapping. Sediments are typically poorly to moderately sorted, and consist of sand, silt, and gravel that form smooth geomorphic surfaces with little to no dissection.
Alluvial fan deposits (Holocene) – Sediment deposited by streams emanating from canyons to produce relatively undissected, fan-shaped deposits on alluvial valley floors. Sediments are typically moderately to poorly sorted, and consist of sand, gravel, silt, and occasionally clay.
Alluvial deposits, undivided (Holocene to latest Pleistocene) – Sand, gravel, silt, and clay mapped in small valleys and where separate fan, basin, terrace, and active stream channel units could not be delineated at the scale of mapping.
Alluvial fan deposits (Holocene to latest Pleistocene) – Sediment deposited by streams emanating from canyons to produce slightly to moderately undissected, fan-shaped deposits on alluvial valley floors. Sediments are typically moderately to poorly sorted, and consist of sand, gravel, silt, and occasionally clay.
Stream terrace deposits (Holocene to latest Pleistocene) – Relatively flat or gently sloping surfaces with slightly to moderately weathered, and slightly to moderately dissected deposits of sand, gravel, silt, and minor clay.
Landslide deposits (historical to Pleistocene) – Arrows indicate direction of movement; queried where landslide existence is questionable.
Alluvial deposits, undivided (late Pleistocene) – Moderately to highly dissected, poorly to moderately sorted deposits of sand, silt, and gravel.
Alluvial fan deposits (late Pleistocene) – Sediment deposited by streams emanating from canyons to produce fan-shaped deposits on alluvial valley floors. Sediments are moderately to highly dissected, typically moderately to poorly sorted, and consist of sand, gravel, silt, and occasionally clay.
Terrace deposits (late Pleistocene) – Orange to red-stained, poorly sorted sand and gravel with clasts that vary from subangular to well-rounded and up to cobble size. Deposits generally consists of a variety of both Tertiary volcanic and basement lithologies. Age estimated from degree of iron oxide staining and weathering, dissection, and elevation above active channel.
Older alluvial deposits, undivided (Pleistocene) – Highly dissected alluvial fan, channel and terrace deposits consisting of poorly to moderately sorted, sand, silt, and gravel.
Unnamed fluvial deposits (early Pleistocene to Pliocene) – Light-brown to yellow- brown, weakly consolidated gravel, tuffaceous sand, silt, clay, and reworked tuff. Clasts are derived from Tertiary volcanic and Franciscan basement rocks. Includes gravels previously mapped as Glen Ellen; name not used here because of unreliable lithologic and age criteria for distinguishing between the units and correlation with the formation type localities (McLaughlin and others, 2008).
Silica carbonate rock (Pleistocene and Pliocene) – Hydrothermally altered ultramafic rocks that consist of varying proportions of quartz and magnesium carbonate mineral assemblages. Color is variable and may include shades of white, green, red, brown and yellow.
Sonoma Volcanics, andesite, basaltic andesite, and basalt (Pliocene to Miocene) – Dark-gray to dark-brownish-gray flows and flow breccias, phenocrysts of olivine and
plagioclase; locally vessicluar.
Franciscan Complex – Central Belt
Sandstone (late Eocene to Late Cretaceous) – Composed chiefly of broken, massive to distinctly bedded, light-gray to greenish-gray, brown- and orange-weathering sandstone. Unit also includes some argillite and shale with disrupted bedding. Sandstone is mostly feldspathic-lithic wacke with detrital biotite and muscovite (Blake and others, 2002).
Sandstone (Late Cretaceous) – Massive to distinctly bedded, brown-weathering, greenish-gray, white mica- and K-feldspar-bearing feldspathic-lithic wacke and dark-gray shale; locally, the sandstone exhibits incipient foliation. Age based on similarity to fossil-bearing sandstone outside the study area (Blake and others, 2002).
Sandstone (Late and Early Cretaceous) – Thin-bedded to massive, buff-weathering, graywacke and minor interbedded black shale; locally interbedded with chert and greenstone. Distinguished from other Cretaceous Franciscan sandstones by the large amount of lithic detritus and apparent lack of K-feldspar (Blake and others, 2002).
Chert (Cretaceous and Jurassic) – Thin-bedded red chert with buff-weathering, dark-gray shale and slate partings (Blake and others, 2002).
Franciscan graywacke and mélange, undivided (Late Cretaceous to Early Jurassic) – Predominantly broken and locally sheared, massive to distinctly bedded, gray to green, brown- to orange-weathering, lithic wacke, and dark-gray shale. Also includes areas of mélange (see KJfm) not differentiated from the more coherent graywacke due to gradational contacts, and/or size relative to map scale.
Franciscan Central Belt mélange (Late Cretaceous to Early Jurassic) – Tectonic mixture of penetratively sheared argillite and graywacke that forms a matrix around more coherent rock masses of varied lithology. Individually mapped blocks differentiated as follows:
Chert – Red, green, and white, thin-bedded chert, with minor interbedded shale and tuff; frequently intermingled with greenstone.
Greenstone – Variably altered and sheared basalt, flow breccias, tuff, and diabase. Dark greenish- gray to black, weathered dark-brown to orange, predominantly massive, occasionally vesicular, or with pillow structure preserved.
High-grade metamorphic rock – Includes metabasalt and metasediments with phyllitic to gneissose texture; largely blueschist grade, and amphibolite to eclogite partially retrograded to blueschist.
Greenstone (Jurassic) – Massive and pillowed basalt metamorphosed to greenstone. Amygdaloidal in places.
Franciscan Complex – Eastern Belt
Metagraywacke (Cretaceous and Jurassic) – Fine- to coarse-grained, highly reconstituted (textural zone 2 to 3 of Blake and others, 1967), white mica- and glaucophane-bearing metagraywacke, with minor interbeds of low blueschist grade metachert and greenstone.
Metabasalt (Cretaceous and Jurassic) – Green, glaucophane-muscovite-lawsonite- sphene-bearing, non-foliated metabasalt, and greenstone.
Great Valley Sequence
Mudstone, sandstone and conglomerate, undivided (Early Cretaceous and Late Jurassic).
Conglomerate (Early Cretaceous and Late Jurassic) – Predominantly massive, gray to brown cobble conglomerate, with minor thin interbeds of mudstone and sandstone. Clasts are generally rounded to well-rounded, composed of distinctive light-colored rhyolite porphyry, along with welded tuff, quartzite, greenstone, chert, serpentine, and vein quartz.
Mudstone, shale, and sandstone (Early Cretaceous and Late Jurassic) – Dark-gray to black marine mudstone and shale, with occasional thin interbeds and thicker intervals of greenish-gray sandstone. Sporadic, concretionary carbonate beds locally include Tithonian to Valanginian buchia, belemnites, and radiolarians.
Coast Range Ophiolite
Mafic and intermediate volcanic rocks (Late and Middle Jurassic) – Mostly massive, dark-green to gray, aphanitic basalt with amygduloidal and plagioclase-porphyry basalt, and pillow basalt. Also includes diabase, keratophyre, and amygduloidal and plagioclase-hornblende-porphyry andesite (Blake and others, 2002).
Mafic and intermediate intrusive rocks (Late and Middle Jurassic) – Diabase, gabbro, and diorite. Also includes minor intrusive keratophyre (Blake and others, 2002).
Serpentinite (Late and Middle Jurassic) – Highly sheared, variably serpentinized ultramafic rocks. Occurs mostly along faults and shear zones, or as isolated blocks within Franciscan mélange and graywacke.
Serpentinite matrix mélange (Late and Middle Jurassic) – Fault-bounded slivers of sheared serpentinite enclosing blocks of graywacke, greenstone, metachert, and high-grade metamorphic rocks.
KJgv
KJgvc
KJgvs
KJfms
KJfmg
sp
spm
Jv
Jd
af
Qhf
Qf
Qt
Qa
Qhay
Qhfy
Qhc
Qha
Qls
Qoa
Qpt
Qpf
Qpa
Tsvb
KJfs
TKfs
Kfss
Kfgwy
KJfc
QTg
adf
alf
sc
Jfgs
DESCRIPTION OF MAP UNITS
KJfm
ch
gs
m
STATE OF CALIFORNIA - EDMUND G. BROWN JR., GOVERNORTHE NATURAL RESOURCES AGENCY - JOHN LAIRD, SECRETARY FOR NATURAL RESOURCES
DEPARTMENT OF CONSERVATION - MARK NECHODOM, CONSERVATION DIRECTOR CALIFORNIA GEOLOGICAL SURVEYJOHN G. PARRISH, Ph.D., STATE GEOLOGIST PRELIMINARY GEOLOGIC MAP OF THE GEYSERVILLE 7.5’ QUADRANGLE, CALIFORNIA
PRELIMINARY GEOLOGIC MAP OF THEGEYSERVILLE 7.5' QUADRANGLE
SONOMA COUNTY, CALIFORNIA: A DIGITAL DATABASEVERSION 1.0
ByCarlos I. Gutierrez, Peter J. Holland, and Marc P. Delattre
Digital Database by
Carlos I. Gutierrez and Matt O’Neal
2012
This geologic map was funded in part by the USGS National Cooperative Geologic MappingProgram, Statemap Award no. G11AC20220
38°45'122°52'30”
38°37'30”122°52'30”
38°45'
38°37’30”123°00'
Projection: Universal Transverse Mercator, Zone 10N, North American Datum 1927.
Topographic base from U.S. Geological SurveyGeyserville 7.5-minute Quadrangle, 1993.Shaded relief image derived from USGS 1/3 arc-second National Elevation Dataset (NED).
123°00'
Copyright © 2012 by the California Department of ConservationCalifornia Geological Survey. All rights reserved. No part ofthis publication may be reproduced without written consent of theCalifornia Geological Survey.
"The Department of Conservation makes no warranties as to thesuitability of this product for any given purpose."
Preliminary Geologic Map available from:http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
Professional Licenses and Certifications: C.I. Gutierrez - PG No. 8686; P.J. Holland - PG No. 7994, CEG No. 2400; M.P. Delattre - PG No. 5230, CEG No. 1819