Geologic Considerations in Conservation Planning Part 2 Southern California Geology (12/02)

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Presentation transcript:

Geologic Considerations in Conservation Planning Part 2 Southern California Geology (12/02)

Geology of Southern California

Sharp, R.P., 1994, A Field Guide To Southern California: Third Ed., Kendall/Hunt Publishing, 301 p. Resources- Southern California Geology Sharp, R.P. and Glazner, A.F., 1993 Geology Underfoot in Southern California: Mountain Press Publishing, 224 p. Harden, D.R., 1997, California Geology: Prentice Hall Inc., 479 p. California Division of Mines and Geology (CA Geological Survey), California Geology magazine (to 2002)

Map Resources- Southern California Dibblee Foundation Maps: USGS- Geological Mapping in California: h ttp://geology.wr.usgs.gov/wgmt/ CAmap.html ( includes Southern CA Areal Mapping Project maps) California Geological Survey’s Homepage h ttp:// index.htm (incl. link to Index of Geologic Maps) USGS’ National Geologic Map Database (Search by lat/long, county, subtopic

Online Resources- Southern California Geology UCSB- Dept. of Geological Sciences (Educational Outreach) (includes Tanya Atwater’s video clips in Freeware) CSULB’s Geologic Tours of Southern California UCR Dept. Earth Sciences Southern California Earthquake Center

San Andreas Garlock San Jacinto Elsinore Imperial Eastern CA Shear Zone Landers 6/28/92 Mw 7.3

The “Big Bend”

San Andreas Garlock San Jacinto Elsinore Imperial Eastern CA Shear Zone Ventura San Cayetano San Fernando Hollywood/Raymond Cucamonga Northridge 1/17/94 Mw 6.7

Transverse Ranges Mojave Colorado Desert Peninsular RangesLos Angeles Basin

Online Resources- Transverse Ranges UCSB- Dept. of Geological Sciences (Educational Outreach) (cited previously, tho’ emphasis is on Transverse Range) Geology of the Santa Clarita Valley geology/ \index.htm

Pinto Eagle Little San Bernardino San Bernardino San Gabriel Santa Monica Channel Isles Santa Ynez Piru Pine Topatopa I-5/Grapevine Cajon Pass San Gorgonio Pass

Rifting, Rotation, and Volcanism in the Western Transverse Ranges

Rifting, Rotation, and Volcanism in the Western Transverse Ranges

Rifting, Rotation, and Volcanism in the Western Transverse Ranges

Online Resources- Los Angeles Basin What's Oil Doing in Signal Hill, Long Beach, California? (Paleontological Research Institution, Signal Hill Geology) The Los Angeles Region Seismic Experiment (LARSE) (SCEC fact sheet)

Los Angeles Basin 5 million years ago

Sharp, 1994 Santa Monica/Hollywood/Raymond Sierra Madre/Cucamonga F.Z. Whittier Chino Palos Verdes Hills Newport-Inglewood El Moreno San Jose Anticline LA W PO SM SG SA LB Syncline

Online Resources- Peninsular Ranges Geology of San Diego County paleontology/sdgeol.html (San Diego Natural History Museum) Field Guide to the Peninsular Ranges Batholith guy.com/prb99trip.htm (Walawender and Girty in Geological Excursions in Southern California and Mexico Guidebook for the 1991 Annual Meeting, GSA, San Diego)

San Felipe Hills Agua Tibia San Jacinto Santa Rosa San Timoteo Borrego Valley Anza Upland Santa Ana Laguna Santa Margarita Cuyamaca SD O E F El R SJ

Tom Schweich’s “Eastern Mojave Geology --A Botanist's View” : Online Resources- Mojave USGS’ Geology of Mojave National Preserve :

V M P Br 29 Bk N A Tehachapi/ So. Sierra Nevada San Gabriels San Bernardino Little S.B./Pinto Whipple Turtle El Paso Argus SlateAvawatz Providence Old Woman Old Dad G G G G Bullion Cady Bristol

San Andreas Garlock Pinto Mtn Eastern CA Shear Zone

Desert Faults

Cima Volcanic Dome ( years old)

Cima Volcanics ( years old)

Alluvial Fan, Death Valley

Sand Dunes Occur in both deserts Various types of sand dunes are present Found in valleys Some have unique acoustic properties

Imperial Sand Dunes and its Geology /~/abingham/azdesert3.htm (University of Arizona course) Online Resources- Salton Effects of the Imperial Valley Earthquake, Oct (Real et. al)

Fish Cr. Santa Rosa Superstition Vallecito Coyote McCoy Wash Cargo Muchacho Eagle Cockscomb Palen Indio Hills EC I N B Orocopa Chuckawalla Chocolate East Mesa Palo Verde

EC I N B San Gorgonio Pass/ No. & So. Branches San Andreas Sand Hills ? Elsinore/ Laguna Salada San Jacinto/ Coyote Cr./ Superstition Hills/Imperial Elmore Ranch/ Brawley

Badlands Relatively rare for California Carrizo and Indio Hills Sculpted by infrequent flash floods Sparsely Vegetated

Salton Sea History Periodic Holocene inundation (beach ridges) Lake Cahuilla 700 A.D. to approx. 300 years ago : Inundation at least 8 times; 1905: Accidental diversion of Colorado River through Irrigation Canals (1907 closure) Agricultural runoff maintains present lake levels

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)