Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 35, 2004)
Session No. 23 Tuesday, May 4, 2004
8:00 AM-12:00 PM, Boise Centre on the Grove: Ponderosa Pine

T9. Eocene Extension of the Northern Rocky Mountains Region

David A. Foster and Thomas J. Kalakay, Presiding
 Paper #Start Time
23-18:00 AM GEOCHRONOLOGIC CONSTRAINTS ON THE TECTONIC EVOLUTION OF THE BOEHLS BUTTE-CLEARWATER CORE COMPLEX: EVIDENCE FROM 1.01 GA GARNETS: SHA, Grant S.1, VERVOORT, Jeffery D.1, WATKINSON, A. John1, DOUGHTY, P. Ted2, PRYTULAK, Julie1, LEE, Robert G.1, and LARSON, Peter B.1, (1) Department of Geology, Washington State Univ, Pullman, WA 99164, sha@mail.wsu.edu, (2) Department of Geology, Eastern Washington Univ, Cheney, WA 99004
23-28:20 AM U-PB DATING OF PLUTONS ALONG THE TRANSFER ZONE BETWEEN THE BITTERROOT AND PRIEST RIVER METAMORPHIC CORE COMPLEXES: BURMESTER, Russell F., Geology Department, Western Washington Univ, Bellingham, WA 98225-9080, russb@cc.wwu.edu, MCCLELLAND, William C., Department of Geological Sciences, Univ of Idaho, Moscow, ID 83844, and LEWIS, Reed S., Idaho Geological Survey, Univ of Idaho, Moscow, ID 83844-3014
23-38:40 AM EOCENE ELEVATION OF CORDILLERA RECORDED IN STABLE ISOTOPIC COMPOSITION OF DETACHMENT MYLONITES: MULCH, Andreas, Institute of Mineralogy and Geochemistry, Univ of Lausanne, BFSH-2, Lausanne, 1015, Switzerland, andreas.mulch@img.unil.ch and TEYSSIER, Christian, Geology & Geophysics, Univ of Minnesota, Minneapolis, MN 55455
23-49:00 AM GEOLOGIC SIGNATURE OF PALEOGENE RIDGE SUBDUCTION AND SLAB WINDOW FORMATION BENEATH THE CENTRAL NORTH AMERICAN CORDILLERA: BREITSPRECHER, Katrin1, MADSEN, Julianne K.2, ICKERT, Ryan B.2, and THORKELSON, Derek J.2, (1) Earth and Ocean Sciences, Univ of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada, kbreitsp@eos.ubc.ca, (2) Earth Sciences, Simon Fraser Univ, 8888 University Dr, Burnaby, BC V5A 1S6
23-59:20 AM EOCENE FLOW OF PARTIALLY MOLTEN CRUST IN THE NORTH AMERICAN CORDILLERA: TEYSSIER, Christian, KRUCKENBERG, Seth, and WHITNEY, Donna L., Geology & Geophysics, Univ of Minnesota, Minneapolis, MN 55455, teyssier@umn.edu
23-69:40 AM KINEMATICS OF EOCENE METAMORPHIC CORE COMPLEXES IN THE NORTHERN ROCKY MOUNTAINS: FOSTER, David A., Dept. of Geology, Univ of Florida, PO Box 112120, Gainesville, FL 32611-2120, dfoster@geology.ufl.edu, KALAKAY, Thomas J., Department of Earth and Environmental Sciences, Vanderbilt Univ, Nashville, TN 37235, DOUGHTY, P. Ted, Department of Geology, Eastern Washington Univ, Cheney, WA 99004, FANNING, C. Mark, Research School of Earth Sciences, The Australian National Univ, Canberra, ACT, 0200, Australia, and VOGL, James J., Geological Sciences, Univ of Florida, Gainesville, FL 32611
 10:00 AM Break
23-710:20 AM EOCENE EXTENSION IN NORTHWESTERN UTAH-SOUTHERN IDAHO: EARLY MOTION ON THE POLYPHASE MIDDLE MOUNTAIN SHEAR ZONE: WELLS, Michael L.1, SHEELEY, Jay C.1, SPELL, Terry L.1, KELLY, Eric D.2, and HOISCH, Thomas D.2, (1) Department of Geoscience, Univ of Nevada Las Vegas, Las Vegas, NV 89154-4010, mlwells@unlv.nevada.edu, (2) Geology, Northern Arizona Univ, Box 4099, Flagstaff, AZ 86011
23-810:40 AM GROWTH AND COLLAPSE OF THE SEVIER OROGENIC WEDGE: NEW EVIDENCE FROM THE CORDILLERA OF WESTERN MONTANA: KALAKAY, Thomas J., Department of Earth and Environmental Sciences, Vanderbilt Univ, Nashville, TN 37235, thomas.j.kalakay@vanderbilt.edu, FOSTER, David A., Dept. of Geology, Univ of Florida, PO Box 112120, Gainesville, FL 32611-2120, and LONN, Jeffrey D., Montana Bureau of Mines and Geology, Montana Tech, 1300 West Park Street, Butte, MT 59701-8997
23-911:00 AM ANOMALOUS LONGITUDINAL DISPERSAL OF SEDIMENT FROM OLDER, MORE EXTENDED TO YOUNGER, LESS EXTENDED SEGMENTS OF AN EOCENE-OLIGOCENE FOLD-PRONE RIFT ZONE, SW MONTANA: JANECKE, Susanne U., Dept. of Geology, Utah State Univ, Logan, UT 84322-4505, sjanecke@cc.usu.edu, LINK, Paul K., Geosciences, Idaho State Univ, P.O. Box 8072, Pocatello, ID 83209, MCINTOSH, William, Dept. of Geoscience, New Mexico Inst. of Mining and Technology, Socorro, NM 87801, FANNING, Mark, Research School of Earth Sciences, Australian National Univ, Mills Road, Canberra, ACT 0200, Australia, and DORSEY, Rebecca, Geological Sciences, Univ of Oregon, Eugene, OR 97403-1272
23-1011:20 AM FOUR DISTINCT MID-EOCENE AND OLIGOCENE FLUVIAL SYSTEMS, GRASSHOPPER AND BEAVERHEAD BASINS, SW MONTANA: LINK, Paul Karl, Geosciences, Idaho State Univ, Pocatello, ID 83209, linkpaul@isu.edu, JANECKE, Susanne U., Dept. of Geology, Utah State Univ, Logan, UT 84322-4505, and FANNING, C. Mark, Research School of Earth Sciences, The Australian National Univ, Canberra, ACT, 0200, Australia
23-1111:40 AM SYNCHRONOUS EXTENSION AND CONTRACTION IN THE ANACONDA METAMORPHIC COMPLEX: BERGER, Aaron L., ELLIOTT, Colleen G., and LORENSON, Gregory W., Geological Engineering, Montana Tech of the Univ of Montana, 1300 West Park Street, Butte, MT 59701, aberger@mtech.edu

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