An Index to Online Geologic Field Trip
Guides of California

Introduction

The California Geotour is an interactive index of Web pages of geologic field trip guides and related Web sites compiled by the California Geological Survey (CGS) for the benefit of all who have wondered about California's geologic features. We have listed Web pages that contain geologic information, including photographs, maps, text and directions for local natural features throughout the state. The Web pages have been developed by government agencies, geological organizations, professors, students, commercial enterprises, park districts, environmental groups, and those with a keen interest in the earth sciences.

The California Geotour index is organized by regions collectively named  the Geomorphic Provinces of California. The geologic field trip guides are further grouped into general areas within each province. (Example: Basin and Range Province \  Death Valley Area). These areas are listed in geographical order from north to south within each geomorphic province.

We welcome your input and comments about the California Geotour.  We may have inadvertently overlooked some interesting Web pages. If you would like to recommend other California geology related Web sites for this index, please contact the CGS Webmaster.

Begin The California Geotour

  California Geomorphic Provinces Index Map
To Online Geologic Field Trip Guides

California Geomorphic Provinces are distinctive, generally easy to recognize natural regions in which the geologic record, types of landforms, pattern of landscape features, and climate in all parts are similar. For example, the alpine features of the Sierra Nevada greatly distinguish that geomorphic province from the subdued relief on the valley floor of the Great Valley Province. If you would like more information about the geomorphic provinces, please see CGS Note 36, "California Geomorphic Provinces", which provides a comprehensive  description of each of the regions. Click on a province name from the list or a map area below to view online geologic field trips from that province.

Basin and Range : Cascade Range : Coast Ranges : Colorado Desert
Great Valley : Klamath Mountains : Modoc Plateau : Mojave Desert
Peninsular Ranges : Sierra Nevada : Transverse Ranges

(Note: CGS is not responsible for the content of any "off-site" Web page referenced from our Web site.)

Mono Basin - Mammoth Lakes Area

Owens Valley. Trip from Mammoth Lakes to Owens Lake - CSU Pomona
http://geology.csupomona.edu/docs/sierra.html

Long Valley Caldera - USGS
http://lvo.wr.usgs.gov/index.html

Long Valley Vicinity - USGS
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_long_valley.html

Eastern Sierra

Independence Dikes and Mafic Rocks of the Eastern Sierra - GSA
http://www.geolab.unc.edu/Petunia/IDS_Web_Site/FTG.html

Bishop Area

Field Trip to the White-Inyo Range, Eastern California - Peninsula Geological Society
http://www.diggles.com/pgs/2002/PGS02-06a.html

The White Mountains - L.Miller
http://www.sonic.net/bristlecone/WhiteMts.html

Aerial Geology Tours of Eastern California - A.Glazner
http://www.geosci.unc.edu/faculty/glazner/AerialTour/AirTour.html

Owens Valley

High Inyo Mountains Fossils
http://members.aol.com/Waucoba7/im/inyofossils.html

Owens (Dry) Lake...A Human-Induced Dust Problem - USGS
http://geochange.er.usgs.gov/sw/impacts/geology/owens/

Ammonoids At Union Wash, California
http://members.aol.com/Waucoba7/uw/unionwash.html

Union Wash Formation [USGS Bulletin 1928] - USGS
http://members.aol.com/Waucoba7/uw/usgsbulletin.html

Death Valley Area

Death Valley Field Excursion - Columbia University
http://www.ldeo.columbia.edu/dees/V1010/

Geology of Death Valley - USGS
http://wrgis.wr.usgs.gov/docs/parks/deva/deva1.html

Quaternary and Late Pliocene Geology of the Death Valley Region - Friends of the Pleistocene
http://pubs.usgs.gov/of/2001/ofr-01-0051/

Virtual Geology Field Trip [Death Valley National Park] - USGS
http://wrgis.wr.usgs.gov/docs/parks/deva/devaft.html

Death Valley National Park - Exploratorium
http://www.exploratorium.edu/learning_studio/news/january98.html

The Mystery of the Rocks on the Racetrack at Death Valley - Smith College
http://sophia.smith.edu/~lfletche/deathvalley.html

Field trip to Death Valley - UC Berkeley
http://geography.berkeley.edu/ProgramCourses/Field/DeathValley97/HTMLs/DeathValleytitlepage.html

Quaternary and Pliocene of Death Valley region - USGS
http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-01-0051/

Death Valley/Death Valley National Park - USGS
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_death_valley.html

Death Valley National Park - National Park Service
http://www2.nature.nps.gov/grd/parks/deva/index.htm

A Visit to the Early Cambrian Waucoba Spring Geologic Section, California
http://members.aol.com/Waucoba5/dv/wsgeology.htm

Fossils in Death Valley National Park
http://members.aol.com/Waucoba5/dv/dvfossils.htm

GPS Postdoc Field Trip [Death Valley] - Caltech
http://www.gps.caltech.edu/news/features/postdoc2002/index.html

Coso Volcanic Field - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/Coso/description_coso.html

Snow White Talc Mine. Death Valley Area - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/kingston/snow.htm

War Eagle Mine. Near Tecopa, California - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/nopah/wareagle.htm

Trilobites in the Nopah Range, Inyo County
http://members.aol.com/Waucoba5/cf/carfieldtrip.html

Mojave Desert

Mojave National Preserve - National Park Service
http://www2.nature.nps.gov/grd/parks/moja/index.htm

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Mount Shasta

Cones of Mount Shasta Reveal Past Volcanic Eruptions - USGS
http://volcanoes.usgs.gov/Hazards/Where/ShastaDanger/faces.html

Mount Shasta and Vicinty - USGS
http://vulcan.wr.usgs.gov/Volcanoes/Shasta/description_shasta.html

Shasta - University of North Dakota
http://volcano.und.nodak.edu/vwdocs/volc_images/north_america/california/shasta.html

Geology of Mount Shasta - College of the Siskiyous
http://www.siskiyous.edu/shasta/geo/index.htm

Shasta River Tour: Geology - KRIS
http://www.krisweb.com/krisweb_kt/shasta/geo.htm

Medicine Lake

Medicine Lake Vicinty
http://vulcan.wr.usgs.gov/Volcanoes/MedicineLake/description_medicine_lake.html

Lassen Park Area

Lassen Volcanic National Park Geology - USGS
http://wrgis.wr.usgs.gov/docs/parks/lassen/lassenfact.html

Lassen Park - Southern Arkansas University
http://www.scsc.k12.ar.us/2001Outwest/PacificNaturalHistory/Projects/CearleyD/Lassen.htm

Lassen Peak, Lassen Volcanic Park - University of North Dakota
volcano.und.nodak.edu/vwdocs/Hopson/hopson5.html

Lassen Volcanic National Park -USGS
http://www2.nature.nps.gov/grd/parks/lavo/index.htm

The May 1915 Eruptions of Lassen Peak - Malin Space Science Systems
http://geology.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Fbarsoom.msss.com
%2Fearth%2Flassen%2Flassen2.html

Lassen Peak Volcano - USGS
http://vulcan.wr.usgs.gov/Volcanoes/Lassen/description_lassen.html

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The California Coast

Explore California's Coastal Geography - CERES
http://ceres.ca.gov/ceres/calweb/coastal/geography.html

North Coast

Redwood National Park - National Park Service
http://www2.nature.nps.gov/grd/parks/redw/index.htm

Smith River. A Virtual Trip Through The Josephine Ophiolite - College of the Redwoods
http://online.redwoods.cc.ca.us/depts/science/earth/smith/smith.htm

Geology of Patrick's Point State Park - College of the Redwoods
http://online.redwoods.cc.ca.us/depts/science/earth/patpt/patpt.htm

Sonoma Coast

The Geology of Salt Point State Park - S.E.Hirschfeld
http://eqdoc.home.netcom.com/salt2.html

Shell Beach, Sonoma Coast. A Close look at a Subduction Zone - T.Wright
http://www.sonoma.edu/geology/wright/shellb.html

The Geology of Bodega Head - T.Wright
http://www.sonoma.edu/geology/wright/Bhead.html

Clear Lake Area

Clear Lake Volcanic Field - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/ClearLake/description_clear_lake.html

Santa Rosa Area

Walking Guide to the Petrified Forest - T.Wright
http://www.sonoma.edu/geology/wright/PFguide.html

Trail of the Petrified Forest - T.Wright
http://www.petrifiedforest.org/virtual.html

Sonoma County Geology - T.Wright
http://www.sonoma.edu/geology/wright/overview.html

Pt. Reyes

Point Reyes National Seashore - National Park Service
http://www2.nature.nps.gov/grd/parks/pore/index.htm

Point Reyes Peninsula and Vicinity - San Francisco State University
http://www.sfsu.edu/~geog/bholzman/ptreyes/Welcome.htm

Big Sur

Field Trip to Salina/Nacimento Amalgamated Terrane - Peninsula Geological Society
http://www.diggles.com/pgs/2000/PGS00-05b.html

San Francisco Area

Geology and Natural History of the San Francisco Bay Area-USGS
http://geopubs.wr.usgs.gov/bulletin/b2188/

San Francisco Bay Region Geology - USGS
http://wrgis.wr.usgs.gov/wgmt/sfbay/index.html

The San Andreas Fault and the San Francisco Bay Area - Stanford
http://sepwww.stanford.edu/oldsep/joe/fault_images/BayAreaSanAndreasFault.html

Golden Gate National Recreation Area - National Park Service
http://www2.nature.nps.gov/grd/parks/goga/index.htm

Field Trip to the Fitzgerald Marine Preserve - USGS
http://wrgis.wr.usgs.gov/wgmt/sfbay/fitzgerald-ft.html

Robert Sibley Volcanic Regional Preserve - East Bay Regional Park District
http://www.ebparks.org/parks/sibley.htm

Field Trip to the Hayward Fault Zone - USGS
http://wrgis.wr.usgs.gov/wgmt/sfbay/hayward-ft.html

San Andreas Fault and Hayward Fault, San Francisco Bay Area
http://homepages.udayton.edu/%7Ekoziol/courses/bayareatrip.html

The San Andreas Fault - USGS
http://pubs.usgs.gov/gip/earthq3/contents.html

The San Andreas Fault - Buena Vista Museum of Natural History
http://www.sharktoothhill.com/fault.html

Recent Earthquakes in California and Nevada - USGS
http://quake.usgs.gov/recenteqs/Maps/SF_Bay.html

A (Geology) Tour of the Berkeley Campus - UC Berkeley
http://www.seismo.berkeley.edu/seismo/geotour/tourmap.html#navmap

Geology of the CSUH Campus -- A Piece of Ancient Ocean Crust - CSU Hayward
http://www.mcs.csuhayward.edu/%7Eshirschf/csuhgeo.html

...Strike-slip, Contraction, and Neogene Paleogeographies... - CSU Hayward
http://www.mcs.csuhayward.edu/%7Eshirschf/page1.html

Tour of the Hayward Fault - CSU Hayward
http://www.mcs.csuhayward.edu/%7Eshirschf/tour-1.html

Geology and Natural History of the San Francisco Bay Area - USGS
http://geopubs.wr.usgs.gov/bulletin/b2188

The San Andreas Fault in the San Francisco Bay Area, California: A Geology Fieldtrip Guidebook to Selected Stops on Public Lands - USGS
http://pubs.usgs.gov/of/2005/1127
 

Mt. Diablo

Geology of Mt. Diablo - Mt. Diablo Interpretive Assoc.
http://www.mdia.org/geology.htm

Geologic Guide to the Falls Trail Loop - Mt. Diablo Interpretive Assoc.
http://www.mdia.org/mdiageofalls.htm

Geology of Mt. Diablo State Park - SFGate
http://www.sfgate.com/getoutside/1997/apr/diablo_geology.html

San Jose Area

Del Puerto Canyon - CSU Stanislaus
http://geology.csustan.edu/fieldtrips/delpuerto

Santa Cruz Area

Regional Sites of Geologic Interest - Moss Landing
http://www.mlml.calstate.edu/groups/geooce/rgnalsts.htm

Field-Trip Guide to the Southeastern Foothills of the Santa Cruz Mountains - USGS
http://geopubs.wr.usgs.gov/open-file/of02-121/

 Loma Prieta Earthquake. Geology of the 1989 Loma Prieta Earthquake - UC Santa Cruz
http://www.es.ucsc.edu/%7Ees10/fieldtripEarthQ/EarthQWelcome.html

Coastal Geology of Natural Bridges State Park - UC Santa Cruz
http://es.ucsc.edu/%7Ees10/fieldtripNBridge/

UC Santa Cruz. Geology of the UCSC campus - UC Santa Cruz
http://www.es.ucsc.edu/%7Ees10/fieldtripUCSC/index.html

Field-trip guide to the geology of the Lexington Reservoir and Loma Prieta areas in the Santa Cruz Mountains, Santa Clara and Santa Cruz Counties, California - USGS
http://geopubs.wr.usgs.gov/open-file/of02-221/

Monterey Bay Area

Northern Monterey Bay, California. Geology and Coastal Hazards - USGS
http://geopubs.wr.usgs.gov/open-file/of00-438/

Regional Sites of Geologic Interest - Moss Landing
http://www.mlml.calstate.edu/groups/geooce/rgnalsts.htm

The Geology of the Monterey Bay Area - UC Santa Cruz
http://www.es.ucsc.edu/%7Ees10/fieldtrips.html

Big Sur - Peninsula Geological Society
http://www.diggles.com/pgs/2000/PGS00-05b.html

Gilroy-Hollister

A Walking Tour of the Calaveras Fault in Hollister, California - Stanford
http://sepwww.stanford.edu/oldsep/joe/fault_images/Hollister.html

Soledad Area

Pinnacles National Monument - National Park Service
http://www2.nature.nps.gov/grd/parks/pinn/index.htm

Coalinga Area

Field Trip to the Kettleman Hills Fossil District. Kings County, California
http://members.aol.com/Waucoba5/kh/kettlefieldtrip.html

San Luis Obispo Area

The Morros (Morro Rock and Other Features) - Cuesta College
http://www.cuesta.org/deptinfo/geology/morros.htm

Pismo Beach...Geology Walk
http://www.jf2.com/geowalk/geowalk.html

Geological Tour of Poly Canyon - Cal Poly
http://polyland.calpoly.edu/topics/Geology/Geotour/pages/site1.htm

Taft Area

The San Andreas Fault and the Geology of the Carrizo Plain National Monument - BLM
http://www.ca.blm.gov/bakersfield/georesources.html

Geology of the McKittrick Tar Pits - San Joaquin Geological Society
http://www.sjgs.com/tarpits_geol.html

The McKittrick Tar Seeps - Buena Vista Museum of Natural History
http://www.sharktoothhill.com/tarseeps.html

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Salton Sea

The Salton Sea - R.Busch
http://fgms.home.att.net/salton.htm

The Salton Sea-Homepage - San Diego SU
http://www.sci.sdsu.edu/salton/SaltonSeaHomePage.html

Salton Basin-Colorado Delta - San Diego State University
http://www.sci.sdsu.edu/salton/SaltonBasinHomePage.html

Salton Buttes Lava Domes - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/SaltonButtes/description_salton_buttes.html

Imperial Valley Area

Imperial Sand Dunes - DUSA
http://desertusa.com/sandhills/sandhillsorg.html

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Sacramento Valley

Sutter Buttes - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/SutterButtes/description_sutter_buttes.html

Sutter Buttes - USGS
http://tapestry.usgs.gov/features/33sutter.html

San Joaquin Valley

San Joaquin Valley Through Time - Buena Vista Museum of Natural History
http://www.sharktoothhill.com/california.html

Vernal Pools-Ephemeral Oasis of the Foothills - Yosemite Association
http://www.yosemite.org/naturenotes/VernalPools.htm

Bakersfield Area

A Visit to the Sharktooth Hill Bone Bed, Southern California
http://members.aol.com/Waucoba5/sb/sharkbonebed.html

Sharktooth Hill - Buena Vista Museum of Natural History
http://www.sharktoothhill.com/sharktooth.html

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Trinity Mountains

Trinity River Tour: Geology - KRIS
http://www.krisweb.com/krisweb_kt/trtour/geo.htm

Klamath Mountains

Mt. Shasta and the Klamath Mountains Field Trip - Peninsula Geological Society
http://www.diggles.com/pgs/2001/PGS01-05c.html

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NE Siskiyou County

Lava Beds National Monument - National Park Service
http://www2.nature.nps.gov/grd/parks/labe/index.htm

Lava Beds National Monument - USGS
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_lava_beds.html

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Mojave Desert

Fossils at Red Rock Canyon State Park
http://members.aol.com/Waucoba7/redrock/redrockfossils.html

Mojave National Preserve - National Park Service
http://www2.nature.nps.gov/grd/parks/moja/index.htm

Mojave National Preserve - USGS
http://geology.wr.usgs.gov/docs/parks/mojave/mojaveft.html

Beck Spring Iron Deposit. In Kingston Range - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/kingston/beckiron.htm

Mohawk Mine. In the Ivanpah mining district, S. California - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/mohawk/mohawk.htm

Colosseum Mine. In Ivanpah Mining District - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/mtp/coloss.htm

Mountain Pass Rare Earth Mine. Ivanpah Mining District. - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/mtp/mtnpass.htm

Amboy Crater - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/Amboy/description_amboy.html

Joshua Tree National Monument - National Park Service
http://www2.nature.nps.gov/grd/parks/jotr/index.htm

Joshua Tree National Park On Shaky Ground - USGS
http://wrgis.wr.usgs.gov/docs/parks/jotr/jotr1.html

Barstow Area

Fossils From Pleistocene Lake Manix, California
http://members.aol.com/Waucoba5/manix/manixlakebeds.html

Waterman Mine. Near Barstow - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/waterman//waterman.htm

Mojave National Preserve - USGS
http://geology.wr.usgs.gov/docs/parks/mojave/mojave1.html

Calico Mining District S. California Field Trip - CSU Pomona
http://geology.csupomona.edu/drjessey/fieldtrips/calico/calico.htm

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The California Coast

Explore California's Coastal Geography - CERES
http://ceres.ca.gov/ceres/calweb/coastal/geography.html

Channel Islands

Channel Islands. Geology of the S. California Offshore Islands - University of Arizona
http://www.lpl.arizona.edu/%7Ewegryn/SoCal_trip.html

Los Angeles

Where Los Angeles's Water Comes From. LA Aquaduct and E. Sierra Nevada - UCLA
http://www.lalc.k12.ca.us/uclasp/issues/bringing_water/title.htm

La Brea Tar Pits - UCMP-Berkeley
http://www.ucmp.berkeley.edu/quaternary/labrea.html

La Brea Tar Pits Photo Tour - Page Museum of Natural History
http://www.rth.org/tarpits/

The World Famous La Brea Tar Pits - USGS
http://seeps.wr.usgs.gov/seeps/la_brea.html

Santa Monica Mountains National Recreation Area - National Park Service
http://www2.nature.nps.gov/grd/parks/samo/index.htm

Palm Springs Area

Cuyamaca Rancho State Park Geology
http://www.cuyamaca.statepark.org/Geology.htm

Orange County

The Geologic History of Orange County - Irvine Valley College
http://www.ivc.cc.ca.us/academics/physical_sciences/geology/ocgeo.aspx

Temecula Area

Field Guide to the Santa Rosa Plateau - T.Chester
http://tchester.org/srp/index.html

Geology of Temecula Canyon - T.Chester
http://tchester.org/fb/geology/temecula_canyon.html

San Diego County

Geology of San Diego County - San Diego Natural History Museum
http://www.sdnhm.org/research/paleontology/sdgeol.html

Geology Field Trip of San Diego County: Coast to Mountains - MiraCosta College
http://www.miracosta.cc.ca.us/home/cmetzler/GeolDayTrip/geo_top.html

Coastal Erosion Field Trip Solana Beach to Del Mar, San Diego County - MiraCosta College
http://www.miracosta.cc.ca.us/home/cmetzler/field_trip/top.html

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Northern Sierra Nevada

A Paleobotanical Field Trip to the Sailor Flat Hydraulic Gold Mine 
http://members.aol.com/Waucoba7/sf/sailorflat.html

Fossil Plants of the Ione Basin, Western Foothills of the Sierra Nevada
http://members.aol.com/Waucoba5/ione/ioneproject.html

Yosemite

Roadside Geology of Yosemite Valley - NAGT-FWS
http://virtual.yosemite.cc.ca.us/ghayes/roadside.htm

Bedrock Geology of the Yosemite Valley Area - USGS
http://wrgis.wr.usgs.gov/docs/parks/yos/yos.html

Yosemite National Park - USGS
http://www2.nature.nps.gov/grd/parks/yose/index.htm

Yosemite National Park
http://yosemite.areaparks.com/

Yosemite National Park - University of St. Andrews, Ireland
http://www.tcd.ie/Natural_Resources/Geoscience/yosindex.htm

About Yosemite Valley - Buena Vista Museum of Natural History
http://www.sharktoothhill.com/about_yosemite.html

Eastern Sierra Nevada

Eastern Sierras. Walker River to Owens Valley - University of Nevada, Reno
http://www.geography.unr.edu/geoghome/students/work/geog314/field%20trip%201998/main.html

Where Los Angeles's Water Comes From. LA Aquaduct and E. Sierra Nevada - UCLA
http://www.geography.unr.edu/geoghome/students/work/geog314/field%20trip%201998/main.html

Mammoth Lakes

Devils Postpile National Park Geologic Story - USGS
http://wrgis.wr.usgs.gov/docs/parks/depo/dpgeol1.html

Devils Postpile National Monument - National Park Service
http://www2.nature.nps.gov/grd/parks/depo/index.htm

Southern Sierra Nevada

Sequoia and Kings Canyon National Parks - National Park Service
http://www2.nature.nps.gov/grd/parks/seki/index.htm

Golden Trout Creek Volcanic Field - USGS
http://vulcan.wr.usgs.gov/Volcanoes/California/GoldenTroutCreek/
description_golden_trout_creek_volcanic_field.html

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The California Coast

Explore California's Coastal Geography - CERES
http://ceres.ca.gov/ceres/calweb/coastal/geography.html

Channel Islands

Channel Islands National Park - National Park Service
http://www.nps.gov/chis/

Channel Islands. Geology of the S. California Offshore Islands - University of Arizona
http://www.lpl.arizona.edu/%7Ewegryn/SoCal_trip.html

Northern Los Angeles County

Geology of the Santa Clarita Valley - M.Ballard
http://www.scvresources.com/geology/

Geology of Acton - M.Ballard
http://www.scvresources.com/geology/acton.htm

Geology of Agua Dulce - M.Ballard
http://www.scvresources.com/geology/aguadulc.htm

Geology of Canyon Country - M.Ballard
http://www.scvresources.com/geology/canyon.htm

Geology of Castaic and Adjacent Areas - M.Ballard
http://www.scvresources.com/geology/castaic.htm

Drive #1 - Soledad and Mint Canyons - M.Ballard
http://www.scvresources.com/geology/drive_1.htm

I-5/SR-14 Interchange to Magic Mountain via I-5 [San Andreas Fault] - M.Ballard
http://www.scvresources.com/geology/drive_2.htm

Santa Clarita Valley - M.Ballard
http://www.scvresources.com/geology/index.htm

Geology of Newhall - M.Ballard
http://www.scvresources.com/geology/newhall.htm

San Andreas Fault - Palmdale to Gorman - M.Ballard
http://www.scvresources.com/geology/san_andreas.htm

Geology of Saugus - M.Ballard
http://www.scvresources.com/geology/saugus.htm

Geology of Valencia - M.Ballard
http://www.scvresources.com/geology/valencia.htm

San Gabriel Mountains

Field Guide to the Punchbowl Fault Zone ... Los Angeles County ..., California - F.M.Chester
http://geoweb.tamu.edu/Faculty/chesterf/e_pubs/

Field Guide to the San Gabriel Mountains - T.Chester and J.Strong
http://tchester.org/sgm/sgm.html

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 Created by:
      Les Youngs, Joy Arthur, and Milton Fonseca, 
      California Geological Survey.