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

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Presentation on theme: "Geologic Considerations in Conservation Planning Part 2 Southern California Geology (12/02)"— Presentation transcript:

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

2 http://www.geol.ucsb.edu/Outreach/Download/Freeware-FR.html

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10 Geology of Southern California

11 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)

12 Map Resources- Southern California Dibblee Foundation Maps: http://dibblee.geol.ucsb.edu/ 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://www.consrv.ca.gov/cgs/ index.htm (incl. link to Index of Geologic Maps) USGS’ National Geologic Map Database http://ngmdb.usgs.gov/ (Search by lat/long, county, subtopic

13 Online Resources- Southern California Geology UCSB- Dept. of Geological Sciences (Educational Outreach) http://www.geol.ucsb.edu/L2/Outreach-FR.html (includes Tanya Atwater’s video clips in Freeware) CSULB’s Geologic Tours of Southern California http://seis.natsci.csulb.edu/VIRTUAL_FIELD/vfmain.htm UCR Dept. Earth Sciences http://earthscience.ucr.edu/ Southern California Earthquake Center http://www.scec.org/

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

24 The “Big Bend”

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26 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

27 Transverse Ranges Mojave Colorado Desert Peninsular RangesLos Angeles Basin

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29 Online Resources- Transverse Ranges UCSB- Dept. of Geological Sciences (Educational Outreach) http://www.geol.ucsb.edu/L2/Outreach-FR.html (cited previously, tho’ emphasis is on Transverse Range) Geology of the Santa Clarita Valley http://www.scvresources.com/ geology/ \index.htm

30 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

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32 Rifting, Rotation, and Volcanism in the Western Transverse Ranges

33 Rifting, Rotation, and Volcanism in the Western Transverse Ranges

34 Rifting, Rotation, and Volcanism in the Western Transverse Ranges

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36 Online Resources- Los Angeles Basin What's Oil Doing in Signal Hill, Long Beach, California? http://www.priweb.org/ed/pgws/backyard/signal_hill/signal_hill_oil2.html (Paleontological Research Institution, Signal Hill Geology) The Los Angeles Region Seismic Experiment (LARSE) http://geopubs.wr.usgs.gov/fact-sheet/fs110-99/ (SCEC fact sheet)

37 Los Angeles Basin 5 million years ago

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39 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

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

43 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

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46 Tom Schweich’s “Eastern Mojave Geology --A Botanist's View” : http://www.schweich.com/mdfA.html Online Resources- Mojave USGS’ Geology of Mojave National Preserve : http://geology.wr.usgs.gov/docs/parks/mojave/mojavetech.html

47 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

48 San Andreas Garlock Pinto Mtn Eastern CA Shear Zone

49 Desert Faults

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51 Cima Volcanic Dome (330-480 years old)

52 Cima Volcanics (330-480 years old)

53 Alluvial Fan, Death Valley

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

57 Imperial Sand Dunes and its Geology http://www.geo.arizona.edu /~/abingham/azdesert3.htm (University of Arizona course) Online Resources- Salton Effects of the Imperial Valley Earthquake, Oct. 1979 (Real et. al) http://www.johnmartin.com/earthquakes/eqpapers/00000038.htm

58 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

59 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

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

62 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

63 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)


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