Topical Sessions

T80 Pre-EarthScope Synthesis of the Rocky Mountains V: New Insights in Basement Tectonics, Deep Crustal Structure and Precambrian Tectonic Evolution
GSA Structural Geology and Tectonics Division; GSA Geophysics Division; Rocky Mountain Association of Geologists; Colorado Scientific Society; EarthScope
Michael Williams, University of Massachusetts, Amherst, Mass.; Karl E. Karlstrom, University of New Mexico, Albuquerque, N.Mex.

Studies of processes of accretion of juvenile lithosphere, location of major sutures, lithospheric stabilization and reactivation processes, and cumulative tectonic evolution of the basement leading to today's geophysical state of the crust and upper mantle. ORAL and POSTER

Tectonics; Geophysics/Tectonophysics/Seismology; Quaternary Geology/Geomorphology

T81 Regional Geology of the Northern Rockies: A Session Honoring Betty Skipp
GSA Structural Geology and Tectonics Division; GSA Sedimentary Geology Division; SEPM-Society for Sedimentary Geology
Paul K. Link, Idaho State University, Pocatello, Idaho; Susanne Janecke, Utah State University, Logan, Utah; David Lageson, Montana State University, Bozeman, Mont.

For 50 years, Betty Skipp, U.S. Geological Survey, has, learned, taught, and led by example in understanding the paleontological, sedimentary, and structural development of the northern Rocky Mountains. Historical syntheses, state-of-the-art ideas, and student papers are welcomed. ORAL and POSTER

Tectonics; Structural Geology; Stratigraphy

T82 Bill Braddock's Backyard-Proterozoic to Recent Geology of the Northern Colorado Front Range
GSA Structural Geology and Tectonics Division
James C. Cole, U.S. Geological Survey, Denver, Colo.; William Nesse, University of Northern Colorado, Greeley, Colo.

An eclectic session reflecting the broad interests and accomplishments of one of Colorado's premier field geologists in one of the most scenic and geologically diverse outdoor laboratories. A tribute to the career of William A. Braddock. ORAL

Precambrian Geology; Structural Geology; History of Geology

T83 Cordilleran Arc Magmatism, BATHOLITHS and Continental Crustal Genesis
GSA Geophysics Division; GSA Structural Geology and Tectonics Division
Mihai N. Ducea, University of Arizona, Tucson, Ariz.; Christopher Andronicos, University of Texas, El Paso, Texas; Paul Wetmore, University of Arizona, Tucson, Ariz.

Petrologists, geochronologists, structural geologists, and geophysicists will present data and models on the evolution of continental arcs, with a special emphasis on the Coast Mountains batholith and preliminary data from the National Science Foundation Continental Dynamics project BATHOLITHS. ORAL

Tectonics; Petrology, Igneous; Geophysics/Tectonophysics/Seismology

T84 Terrane Translation, Orogenesis, and Plate Interactions in the Late Mesozoic to Early Cenozoic North American Cordillera, and Implications for Paleogeographic Reconstructions
GSA Geophysics Division; GSA Structural Geology and Tectonics Division
Paul Umhoefer, Northern Arizona University, Box 4099, Flagstaff, Ariz.; Sandra Wyld, University of Georgia, Athens,Ga.; James E. Wright, University of Georgia, Athens, Ga.

Session will focus on the interrelations among terrane translation, orogenesis, and plate motions; the amount and sense of terrane displacements; and the implications of new and existing data for paleogeographic and tectonic reconstructions. ORAL and POSTER

Tectonics; Stratigraphy; Geophysics/Tectonophysics/Seismology

T85 Whence the Mountains? New Developments in the Tectonic Evolution of Orogenic Belts: Celebrating the Dynamic Career of Raymond A. Price at the 50Year Mark
GSA Structural Geology and Tectonics Division; Geological Association of Canada
James W. Sears, University of Montana, Missoula, Mont.; Tekla A. Harms, Amherst College, Amherst, Mass.; Carol Evenchick, Natural Resources Canada, Vancouver, British Columbia

An investigation into the tectonic evolution of ancient and active mountain belts from around the globe, using traditional and innovative methods at all scales of observation. ORAL and POSTER

Tectonics; Structural Geology; Geophysics/Tectonophysics/Seismology

T86 Ribbon Continents: Their Origin, Development, and Role in Rifting and Orogenesis
GSA Structural Geology and Tectonics Division; GSA Geophysics Division
Phil J.A. McCausland, University of Michigan, Ann Arbor, Mich.; Stephen T. Johnston, University of Victoria, Victoria, British Columbia

Ribbon continents, long assemblages of rifted continental fragments and intraoceanic arcs, are a locus of crustal deformation and growth. This session explores their occurrence and role in the evolution of continental margins and orogenic belts. ORAL

Tectonics; Structural Geology; Geophysics/Tectonophysics/Seismology

T87 Recent Advances in Himalayan Geology
GSA Structural Geology and Tectonics Division
Elizabeth J. Catlos, Oklahoma State University, Stillwater, Okla.; Richard A. Marston, Oklahoma State University, Stillwater, Okla.

Recent discoveries regarding the evolution of the Himalayas will be examined with the goal of disseminating and exploring broader implications of information gained from this type locality of continent-continent convergence. ORAL

Tectonics; Volcanology; Geophysics/Tectonophysics/Seismology

T88 Thrust Belts and Plateaus: The Anatomy of Convergent Systems
GSA Structural Geology and Tectonics Division; GSA Geophysics Division
Delores M. Robinson, University of Alabama, Tuscaloosa, Ala.; Nadine McQuarrie, California Institute of Technology, Pasadena, Calif.

We encourage papers that explore the linkage between foreland fold-thrust belts and adjacent hinterland plateaus in orogenic systems through deformation and elevation histories and mechanisms, rates of uplift and erosion, kinematic processes, and morphology. ORAL and POSTER

Tectonics; Geophysics/Tectonophysics/Seismology; Structural Geology

T89 Tectonic Evolution of the Arctic Basin and its Margins
GSA Structural Geology and Tectonics Division
Jaime Toro, West Virginia University, Morgantown, W.Va.; Jeffrey M. Amato, New Mexico State University, Las Cruces, N.Mex.

This session highlights the tectonic evolution of one of the least understood regions of Earth: the Arctic oceanic basin and the surrounding margins and continental terranes. ORAL and POSTER

Tectonics; Geophysics/Tectonophysics/Seismology; Marine/Coastal Science

T90 Low-angle Normal Faults and Faulting: Field Studies, Fault Rocks, Mechanics, and Weakening Mechanisms
GSA Structural Geology and Tectonics Division; GSA Geophysics Division
Robert E. Holdsworth, University of Durham, Durham, United Kingdom; Darrel S. Cowan, University of Washington, Seattle, Wash.; Cristiano Collettini, Universitá di Perugia, Perugia, Italy

An interdisciplinary session where field geologists, experimentalists, seismologists, geodynamicists, and others can present observational evidence and theoretical insights on low-angle normal faults and faulting. ORAL and POSTER

Structural Geology; Tectonics; Petrology, Metamorphic

T91 Paleomagnetism and Rock Magnetism Perspective of Shear Zone Kinematics
GSA Geophysics Division; GSA Structural Geology and Tectonics Division
Tim F. Wawrzyniec, University of New Mexico, Albuquerque, N.Mex.; Mike Petronis, University of New Mexico, Albuquerque, N.Mex.

Integrated studies of shear-zone processes benefit greatly from applied paleomagnetic and rock magnetic investigations. The goal of this session is to demonstrate from a geophysical perspective the applications and caveats of applied paleomagnetism and rock magnetic studies in understanding shear zone kinematics. ORAL and POSTER

Geophysics/Tectonophysics/Seismology; Tectonics; Structural Geology

T92 Neotectonics and Earthquake Potential of the Eastern Mediterranean Region
GSA Structural Geology and Tectonics Division; GSA Geophysics Division
Ibrahim Çemen, Oklahoma State University, Stillwater, Okla.; Eric Sandvol, University of Missouri, Columbia, Mo.; Omer Emre, MTA, Ankara, Turkey

Different research groups have been studying neotectonics and earthquake potential of major tectonic features of different portions of the eastern Mediterranean region. This session plans to provide a formal discussion on problems related to neotectonics of the region. ORAL and POSTER

Geophysics/Tectonophysics/Seismology; Neotectonics/Paleoseismology; Tectonics

T93 Crustal Seismic Anisotropy as a Measure of Regional Tectonic Deformation (Posters)
GSA Geophysics Division; GSA Structural Geology and Tectonics Division
David Okaya, University of Southern California, Los Angeles, Calif.; Nikolas Christensen, University of Wisconsin, Madison, Wis.

This session explores how crustal seismic anisotropy may serve as a proxy for intracrustal deformation by combining tectonic formation and regional distributions of shear and metamorphic fabrics, anisotropic material properties, and observations of seismic waves. POSTER

Geophysics/Tectonophysics/Seismology; Tectonics; Structural Geology

T94 Geoinformatics and Geological Sciences: The Next Step (Posters)
GSA Geophysics Division
Ramon Arrowsmith, Arizona State University, Tempe, Ariz.; Charles Meertens, UNAVCO, Inc., Boulder, Colo.

Present results of geoinformatics projects in the geoscience community, in particular from those associated with distributed data and computational resource integration efforts. Explore areas where information technology developments can address geoscience problems. POSTER

Geophysics/Tectonophysics/Seismology; Tectonics; Geoscience Information/Communication

T95 Differentiating Climatic from Tectonic Controls on Landscape Evolution (Posters)
GSA Quaternary Geology and Geomorphology Division; GSA Structural Geology and Tectonics
Claudia J. Lewis, Los Alamos National Lab, Los Alamos, N.Mex.; Eric V. McDonald, Desert Research Institute, Reno, Nev.; John Gosse, Dalhousie University, Halifax, Nova Scotia

Dynamic response of mountainous landscapes to climate-driven denudation bedevils determination of tectonic uplift. We seek papers that quantify landscape and lithospheric responses to climatic and tectonic forcing in active orogens and mountain belts undergoing postorogenic exhumation. POSTER

Quaternary Geology/Geomorphology; Tectonics; Structural Geology

T96 Records of Late Quaternary Climatic Change from the Americas: Interhemispheric Synchroneity or Not
GSA Quaternary Geology and Geomorphology Division
Donald T. Rodbell, Union College, Schenectady, N.Y.; John T. Andrews, University of Colorado, Boulder, Colo.; Geoffrey O. Seltzer, Syracuse University, Syracuse, N.Y.

We seek papers that review high-resolution physical, chemical, and biological archives of climate change during the past ~30,000 years from the Americas, and also including Antarctica and Greenland. Our focus is mainly on terrestrial evidence, but we also welcome near-shore marine records that directly record terrestrial events. ORAL and POSTER

Quaternary Geology/Geomorphology; Paleoclimatology/Paleoceanography

T97 Geologic History and Processes of the Colorado River
GSA Quaternary Geology and Geomorphology Division
Keith A. Howard, U.S. Geological Survey, Menlo Park, Calif.; Cassandra Fenton, Tucson, Ariz.

The history of the Southwest's Colorado River has intrigued scientists and the public for over a century. This session will explore Cenozoic geologic history and processes of the river from the Rockies to Mexico. ORAL and POSTER

Quaternary Geology/Geomorphology; Environmental Geoscience; Stratigraphy

T98 Evolution of the Great Plains Landscape
GSA Quaternary Geology and Geomorphology Division
Joseph A. Mason, University of Wisconsin, Madison, Wis.; James B. Swinehart, School of Natural Resources, Lincoln, Nebr.; J. Elmo Rawling, University of Wisconsin, Platteville, Wis.

This session will highlight research on late Cenozoic landscape evolution of the Great Plains. Topics will include rates and causes of stream incision, drainage network development, and the evolution of tablelands, badlands, dunefields, and playas. ORAL and POSTER

Quaternary Geology/Geomorphology

T99 The Midwest from Deglaciation to Settlement
GSA Quaternary Geology and Geomorphology Division
Kathy J. Licht, Indiana University-Purdue University Indianapolis, Indianapolis, Ind.; Tom Lowell, University of Cincinnati, Cincinnati, Ohio

This interdisciplinary session will explore the landscape impacts of deglaciation, the postglacial transition and Holocene environments from the prairie-woodland boundary to the Appalachians. Investigations of lacustrine, loess, fluvial, and vegetation records are welcome. ORAL

Quaternary Geology/Geomorphology; Paleoclimatology/Paleoceanography; Limnogeology