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Greetings, Colleagues, We write to invite your participation in a special component of the Geological Society of America’s 125th anniversary meeting, this October. In keeping with the annual meeting’s theme, Celebrating Advances in Geoscience, two associated sessions will examine the lithospheric evolution of the North American Cordillera. These are a Pardee Keynote Symposium of invited talks and thematic session T111 for oral and poster contributions. The conference website is: http://community.geosociety.org/2013AnnualMeeting/Home/ . The two sessions examine the North American Cordillera as a continental expression of Neoproterozoic through Cenozoic global plate tectonic events, bringing insight on the temporal and spatial resolution of crustal orogenesis. We invite your participation and encourage you to submit abstracts to this theme. The sessions will examine geological perspectives obtained from interdisciplinary structural, petrological, isotopic, and sedimentological research, providing integral links to plate tectonic processes and lithospheric modifications from Neoproterozoic to Present. They will address the array of geophysical methods and interdisciplinary approaches that have led to accurate characterization of mantle and delimitation of seismic anisotropy to reveal the 3D crustal to deep lithospheric structure of Cordilleran lithosphere, for greater understanding of ongoing geological phenomena influenced by the lithospheric architecture inherited from past geological events. Session descriptions are as follows. Meeting registration is open, and abstract deadline is August 6, via https://gsa.confex.com/gsa/2013AM/cfp.epl. We look forward to your abstract submission via and seeing you in the Cordilleran sessions, at the outset of the GSA anniversary meeting in October! Good wishes, G. Randy Keller Kevin Mickus Anne F. Sheehan Christine Siddoway Basil Tikoff P5. Evolution of the North American Cordilleran Lithosphere GSA Structural Geology and Tectonics Division; Geochemical Society; GSA Geophysics Division. Session Chairs: Anne F. Sheehan<mailto:[log in to unmask]>, University of Colorado; Christine Siddoway<mailto:[log in to unmask]>, Colorado College; and Basil Tikoff<mailto:[log in to unmask]>, University of Wisconsin. Emails: [log in to unmask]; [log in to unmask]; [log in to unmask] This session focuses on the geodynamic evolution of the North American Cordillera with an emphasis on the U.S. West. Its goal is to integrate the entire tectonic history of the region on the crustal to lithospheric scale, emphasizing the relationship of ongoing geological phenomena to the lithospheric architecture inherited from past geological events. T111. The Structure and Evolution of the North American Lithosphere: An Integrated Perspective GSA Geophysics Division; GSA Structural Geology and Tectonics Division; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division. Session Chairs: Kevin Mickus, Missouri State University and G. Randy Keller, University of Oklahoma. Emails: [log in to unmask]; [log in to unmask] Geophysical methods have been instrumental in our understanding of the evolution of the North American lithosphere. This session will present examples of integrated investigations of the structure and evolution of the North American lithosphere.