Session: Late Cenozoic Transition from Subduction to Transform Margin Inboard of the San Andreas Fault: Northern San Francisco Bay Area to Cape Mendocino (Posters) (Cordilleran Section - 101st Annual Meeting (April 29

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GEOLOGY SOUTH OF PUNTA GORDA, MENDOCINO TRIPLE JUNCTION REGION, CA

MANSFIELD, Sunshine S., Geology, Humboldt State Univ, 1 Harpst Street, Arcata, CA 95521, ssm5@humboldt.edu, ssm5@humboldt.edu

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PALEOSEISMIC INVESTIGATION OF THE MAACAMA FAULT AT THE HAEHL CREEK SITE, WILLITS, CALIFORNIA

LARSEN, Mort¹, PRENTICE, Carol S.², KELSEY, Harvey M.¹, ZACHARIASEN, Judith³ and ROTBERG, Gabriel L.⁴, (1)Department of Geology, Humboldt State Univ, Arcata, CA 95521, (2)U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, (3)488 Kenilworth Ave, San Leandro, CA 94577, (4)54 Lassen Drive, Santa Barbara, CA 93111, mcl22@humboldt.edu, mcl22@humboldt.edu

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LATE NEOGENE AND QUATERNARY STRATIGRAPHY AND STRUCTURE OF LITTLE LAKE (WILLITS) VALLEY, NORTHERN COAST RANGE, CALIFORNIA

WOOLACE, Adam C., Department of Geology, Humboldt State Univ, Arcata, CA 95521, KELSEY, Harvey M., Dept . of Geology, Humboldt State Univ, Arcata, CA 95521, SARNA-WOJCICKI, Andrei M., U. S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 and SIMPSON, Gary, SHN Consulting Geologists and Engineers, 812 West Wabash, Eureka, CA 95501, acw4@humboldt.edu, acw4@humboldt.edu

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THE CRUSTAL STRUCTURE OF THE NORTHERN CALIFORNIA COAST RANGES FROM RECEIVER FUNCTIONS

HAYES, Gavin P.¹, FURLONG, Kevin P.¹ and SCHWARTZ, Susan Y.², (1)Geosciences, Penn State Univ, 542 Deike Building, University Park, PA 16802, (2)Earth Sciences, Univ of California Santa Cruz, Santa Cruz, CA 95064, ghayes@geosc.psu.edu, ghayes@geosc.psu.edu

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SLIP RATE AND AGE OF THE MOST RECENT EVENT ON THE CENTRAL MAACAMA FAULT, NEAR UKIAH, MENDOCINO COUNTY, CALIFORNIA

SICKLER, Robert R.¹, PRENTICE, Carol S.¹ and DENGLER, Lori A.², (1)U.S. Geol Survey, 345 Middlefield Road, MS 977, Menlo Park, CA 94025, (2)Dept. of Geology, Humboldt State Univ, Arcata, CA 95521, rsickler@usgs.gov, rsickler@usgs.gov

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AN INVESTIGATION OF A PREVIOUSLY UNMAPPED FAULT IN THE CACHE CREEK NATURAL AREA, LAKE COUNTY, CALIFORNIA

MCPHERSON, R.C.¹, CALL, A.¹, BURKE, R.M.¹ and BURCELL, J.A.², (1)Geology Department, Humboldt State University, Arcata, CA 95521, (2)Field Office, BLM, Ukiah, CA 95482, ac43@humboldt.edu, ac43@humboldt.edu

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NEW GEOLOGIC MAPPING OF THE NORTHERN SAN FRANCISCO BAY REGION; MARIN, SONOMA, NAPA, AND SOLANO COUNTIES, CALIFORNIA

CLAHAN, Kevin B.¹, WAGNER, David², BEZORE, Stephen², SAUCEDO, George J.¹ and GUTIERREZ, Carlos I.², (1)California Geol Survey, 185 Berry St. Ste. 210, San Francisco, CA 94107, (2)California Geol Survey, 801 K Street MS 12-32, Sacramento, CA 95814, kclahan@consrv.ca.gov, kclahan@consrv.ca.gov

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NEOTECTONIC INVESTIGATION OF THE SOUTHERN RODGERS CREEK FAULT, SONOMA COUNTY, CA

RANDOLPH-LOAR, Carolyn E., LACHEL FELICE & Associates, Inc, PO Box 5266, Golden, CO 80401 and CASKEY, S. John, Department of Geosciences, San Francisco State Univ, 1600 Holloway Ave, San Francisco, CA 94132, crandolph.loar@lachel.com, crandolph.loar@lachel.com

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SUBSURFACE GEOLOGY IN THE NORTHERN SAN FRANCISCO BAY REGION, CALIFORNIA

ZIEGLAR, D.L., Chevron (retired), 9409 Elsie Way, Windsor, CA 95492, WRIGHT, T.L., Chevron (retired), San Anselmo, CA 94960 and SMITH, N., Chevron (retired), Freestone, CA 95472, N/A, N/A

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NEW PALEONTOLOGICAL EVIDENCE SUPPORTING THE NEOGENE TRANSITION FROM MARINE TO NON-MARINE CONDITIONS IN MARIN AND SONOMA COUNTIES, CALIFORNIA, USA

STARRATT, Scott W.¹, ALLEN, James R.², POWELL II, Charles L.¹, PETERSON, Dawn E.³, RUCK, Elizabeth⁴ and SARNA-WOJCICKI, Andrei¹, (1)US Geol Survey, 345 Middlefield Rd, Menlo Park, CA 94025-3591, (2)Kleinfelder, 7133 Koll Center Parkway, Suite 100, Pleasanton, CA 94566-3101, (3)Geology and Invertebrate Zoology, California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103, (4)Department of Botany, Univ of Texas, Austin, TX 78712, sstarrat@usgs.gov, sstarrat@usgs.gov

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TRANSITIONAL MARINE, OLIGOHALINE, LIMNIC OSTRACODE ASSEMBLAGES OF THE LOWER PETALUMA FORMATION, SONOMA COUNTY, CALIFORNIA

PETERSON, Dawn E., Museum of Paleontology, Research Associate, University of California, Berkeley, CA 94720-4780 and ALLEN, James R., 6747 Tory Way, Dublin, CA 94568, dwnptrsn2004@yahoo.com, dwnptrsn2004@yahoo.com

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LITHOLOGY AND VERTEBRATE FOSSILS OF THE PETALUMA FORMATION, SONOMA COUNTY, CALIFORNIA

ALLEN, James R., 6747 Tory Way, Dublin, CA 94568 and REPENNING, Charles A., 9010 West 5th Place, Lakewood, CO 80226-1142, jallen@kleinfelder.com, jallen@kleinfelder.com

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THE MOST RECENT LARGE EARTHQUAKE ON THE RODGERS CREEK FAULT, SAN FRANCISCO BAY REGION

HECKER, Suzanne¹, PANTOSTI, Daniela², SCHWARTZ, David P.¹, REIDY, Liam M.³ and HAMILTON, John C.¹, (1)U.S. Geol Survey, 345 Middlefield Rd, Menlo Park, CA 94025, (2)Istituto Nazionale di Geofisica e Vulcanologia, Sezione Sismologia e Tettonofisica, Via di Vigna Murata 605, Roma, I-00143, Italy, (3)Department of Geography, Univ of California, Berkeley, 507 McCone Hall, #4740, Berkeley, CA 94720, shecker@usgs.gov, shecker@usgs.gov

Cordilleran Section - 101st Annual Meeting (April 29–May 1, 2005)

T2. Late Cenozoic Transition from Subduction to Transform Margin Inboard of the San Andreas Fault: Northern San Francisco Bay Area to Cape Mendocino (Posters)