Geologic Considerations in Conservation Planning Part 2 Southern California Geology (12/02)
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Geologic Considerations in Conservation
PlanningPart 2
Southern California Geology
(12/02)
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http://www.geol.ucsb.edu/Outreach/Download/Freeware-FR.html
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Geology of Southern California
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San Andreas Garlock
San Jacinto
Elsinore
Imperial
Eastern
CA Shear
Zone
Landers6/28/92 Mw 7.3
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The“Big Bend”
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San Andreas Garlock
San Jacinto
Elsinore
Imperial
Eastern
CA Shear
Zone
Ventura
San Cayetano
San FernandoHollywood/Raymond
Cucamonga
Northridge1/17/94 Mw 6.7
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Transverse Ranges
Mojave
Colorado Desert
Peninsular Ranges
Los Angeles Basin
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Pint
o
Eagle
Little
San
Berna
rdin
o
San
Bern
ardi
no
San
Gab
riel
Santa
MonicaChan
nel
Isles
Santa
Ynez
Piru
Pine
Topatopa I-5/G
rape
vine
Cajo
n Pa
ss
San
Gorgo
nio
Pass
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Rifting, Rotation, and Volcanism in the Western Transverse Ranges
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Rifting, Rotation, and Volcanism in the Western Transverse Ranges
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Rifting, Rotation, and Volcanism in the Western Transverse Ranges
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Los Angeles Basin5 million years ago
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Sharp, 1994
Santa Monica/Hollywood/Raymond
Sierra Madre/Cucamonga F.Z.
Whittier
Chino
Palos Verdes Hills
Newport-Inglewood
El Moreno
San Jose
Anticline
LAW
POSM
SG
SA
LB
Syncline
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San FelipeHills
Agua Tibia
SanJacinto
Santa Rosa
San Timoteo
BorregoValley
AnzaUpland
SantaAna
Laguna
SantaMargarita
Cuyamaca SD
OE
F
El
R
SJ
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V
M
P
Br
29
Bk
N
A
Tehachapi/
So. Sierra
Neva
da
San GabrielsSan Bernardino Little S.B./Pinto Whipple
Turtle
El Paso
ArgusSlate Avawatz
Providence
OldWoman
Old DadG
G
G
GBullion
Cady
Bristol
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San Andreas
Garloc
k
Pinto Mtn
Eastern
CA Shear
Zone
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Cima Volcanic Dome(330-480 years old)
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Cima Volcanics(330-480 years old)
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Alluvial Fan, Death Valley
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Sand Dunes
• Occur in both deserts• Various types of sand
dunes are present• Found in valleys• Some have unique
acoustic properties
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Fish Cr.
SantaRosa
Superstition
Vallecito
Coyote
McCoyWash
CargoMuchacho
Eagle
Cockscomb PalenIndioHills
EC
I
N
BOrocopaChuckawallaChocolate
East Mesa
Palo Verde
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EC
I
N
B
San Gorgonio Pass/No. & So. Branches San Andreas
Sand Hills ?
Elsinore/Laguna Salada
San Jacinto/Coyote Cr./SuperstitionHills/Imperial
Elmore Ranch/ Brawley
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Badlands
• Relatively rare for California
• Carrizo and Indio Hills
• Sculpted by infrequent flash floods
• Sparsely Vegetated
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Salton Sea History• Periodic Holocene inundation
(beach ridges)• Lake Cahuilla 700 A.D. to
approx. 300 years ago.• 1824-1904: Inundation at least
8 times;• 1905: Accidental diversion of
Colorado River through Irrigation Canals (1907 closure)
• Agricultural runoff maintains present lake levels
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Algodones Dunes
• Built by Colorado River sediments and erosion of bordering ranges
• 320 square miles• Moving southeast due to prevailing
winds (6-12 in/yr)