Session No. 24 Thursday, May 9, 2002

1:00 PM-5:00 PM, Sharwan Smith Center: Starlight Room
T7. Cenozoic Landscape Evolution of the Colorado Plateau and the Basin-and-Range Transition Zone
Joel L. Pederson, Presiding
Start Time
1:00 PM Introductory Remarks
1:05 PM COLORADO PLATEAU AND GRAND CANYON: CRETACEOUS AND OLIGOCENE LANDSCAPE EROSION IN A HIGH RAINFALL ENVIRONMENT DURING SEVIER, LARAMIDE, AND CORDILLERAN OROGENIES: ELSTON, Donald P., 6300 Country Club Dr, Flagstaff, AZ 86004-8748, delston@earthlink.net.
1:25 PM LARAMIDE-PALEOGENE GRAND CANYONE ORIGIN: SCARBOROUGH, Robert B., 15505 N Sunflower Ave, Tucson, AZ 85739-8987, bscarborough@desertmuseum.org.
1:40 PM EXHUMED AND MODERN GRAND CANYON LANDSCAPES: CONTRASTS IN FORM AND PROCESS: YOUNG, Richard A., Geological Sciences, SUNY, Department of Geological Sciences, 1 College Circle, Geneseo, NY 14454, young@geneseo.edu.
2:00 PM UPLIFT AND EROSION OF THE COLORADO PLATEAU AND GRAND CANYON—IMPLICATIONS OF NEW CALCULATIONS OF LARGE-SCALE ROCK UPLIFT, EXHUMATION, AND RIVER INCISION: PEDERSON, Joel L., MACKLEY, Rob D., EDDLEMAN, James L., and LINDSAY, Brad, Logan, UT 54322, bolo@cc.usu.edu
2:20 PM CRETACEOUS SHALES AND THEIR INFLUENCE ON DENUDATION ESTIMATES FOR THE SOUTHWESTERN UNITED STATES: KELLEY, Shari A., Earth and Environmental Science, New Mexico Tech, 801 Bullock St, Socorro, NM 87801, sakelley@ix.netcom.com.
2:35 PM LATE MIOCENE-EARLY PLIOCENE TRANSITION FROM LACUSTRINE TO FLUVIAL DEPOSITION: INCEPTION OF THE LOWER COLORADO RIVER IN SOUTHERN NEVADA AND NORTHWEST ARIZONA: FAULDS, James E.1, GONZALEZ, Luis A.2, PERKINS, Michael E.3, HOUSE, P. Kyle1, PEARTHREE, Philip A.4, CASTOR, Stephen B.1, and PATCHETT, P. Jonathan5, (1) Nevada Bureau of Mines and Geology, Univ of Nevada, Reno, NV 89557-0088, jfaulds@unr.edu, (2) Geoscience, Univ of Iowa, (3) Department of Geology and Geophysics, Univ of Utah, Salt Lake City, UT 84112, (4) Arizona Geological Survey, 416 W. Congress St. #100, Tucson, AZ 89501, (5) Department of Geosciences, Univ of Arizona, Tucson, AZ 85721
2:55 PM Discussion
3:05 PM Break
3:20 PM NEW STRATIGRAPHIC EVIDENCE FOR THE LATE CENOZOIC INCEPTION AND SUBSEQUENT ALLUVIAL HISTORY OF THE COLORADO RIVER FROM NEAR LAUGHLIN, NEVADA: HOUSE, P. Kyle1, PEARTHREE, Philip A.2, BELL, John W.1, RAMELLI, Alan R.1, and FAULDS, James E.1, (1) Nevada Bureau of Mines and Geology, Univ of Nevada, Reno, NV 89557-0088, khouse@unr.edu, (2) Arizona Geological Survey, 416 W. Congress St. #100, Tucson, AZ 89501
3:40 PM EFFECTS OF LARGE-SCALE LANDSLIDING IN CENTRAL GRAND CANYON NATIONAL PARK, ARIZONA: SAVAGE, Jill E., Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, jsavage@mines.edu, HUNTOON, Peter W., PO Box 60850, Boulder City, NV 89006, and WARME, John E., Department of Geology & Geological Engineering, Colorado School of Mines, Golden, CO 80401
3:55 PM IMPLICATIONS OF NEW QUATERNARY STRATIGRAPHIC RESEARCH AND AGE CONTROL IN EASTERN GRAND CANYON FOR LANDSCAPE EVOLUTION AND LAVA-DAM LAKES: ANDERS, Matt D., Department of Geology, Utah State Univ, 4505 Old Main Hill, Logan, UT 84322, mdanders@cc.usu.edu and PEDERSON, Joel L., Logan, UT 54322
4:10 PM NEW 40AR-39AR DATES ON BASALTS IN GRAND CANYON: CONSTRAINTS ON RATES OF QUATERNARY RIVER INCISION AND SLIP ON THE TOROWEAP FAULT, AND IMPLICATIONS FOR LAVA DAMS: MCINTOSH, William C.1, PETERS, Lisa1, KARLSTROM, Karl E.2, and PEDERSON, Joel L.3, (1) Department of Earth and Environmental Science, New Mexico Tech, Socorro, NM 87801, mcintosh@nmt.edu, (2) Earth and Planetary Sciences, Univ of New Mexico, Albuquerque, NM 87131, kek1@unm.edu, (3) Logan, UT 54322
4:30 PM STRUCTURAL ANALYSIS AND LATE CENOZOIC EVOLUTION OF THE HURRICANE FAULT, LOWER WHITMORE WASH, WESTERN GRAND CANYON: RAUCCI, Jason J., Dept. of Geology, Northern Arizona Univ, Po Box 4099, Flagstaff, AZ 86011, jjr6@dana.ucc.nau.edu and UMHOEFER, Paul J., Department of Geology, Northern Arizona Univ, P.O. Box 4099, Flagstaff, AZ 86011
4:45 PM AN UPTHROWN VALLEY? UNCONVENTIONAL FAULTING IN SEVIER VALLEY, UT: CLINE, Eric J., Geology and Geophysics, Univ of Utah, 135 South 1460 East #719, Salt Lake City, UT 84112-0111, ecline@mines.utah.edu and BARTLEY, John, Department of Geology and Geophysics, Univ of Utah, 135 S. 1460 E., Rm 719, Salt Lake City, UT 84112

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