2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

MAGER, Stephanie M., Geology, University of Illinois, 605 E Springfield Ave., Champaign, IL 61820 and MARSHAK, Stephen, Dept. of Geology, University of Illinois, 605 E. Springfield Ave., Champaign, IL 61820, mager2@illinois.edu

MARSHAK, Stephen, Dept. of Geology, University of Illinois, 605 E. Springfield Ave., Champaign, IL 61820, WILKERSON, M. Scott, Geosciences, DePauw University, 602 South College Avenue, Greencastle, IN 46135 and DEFRATES, Joshua, Dept. of Geology, University of Illinois, 605 E. Springfield Ave, Champaign, IL 61820, smarshak@illinois.edu

MURPHY, J. Brendan, Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada, WALDRON, John W.F., Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G2E3, Canada and NANCE, R. Damian, Department of Geological Sciences, Ohio University, Athens, OH 45701, bmurphy@stfx.ca

TIKOFF, Basil, Department of Geoscience, University of Wisconsin-Madison, 1215 W Dayton St, Madison, WI 53706, MICHELS, Z.D., Department of Geoscience, University of Wisconsin - Madison, 1215 W. Dayton St, Madison, WI 53706, BRAUDY, Nicole, Geoscience, University of Wisconsin-Madison, 1215 West Dayton St, Madison, WI 53706 and STETSON-LEE, Tor, Department of Geoscience, University of Wisconsin-Madison, Weeks Hall, 1215 West Dayton Street, Madison, WI 53715, basil@geology.wisc.edu

CRADDOCK, John, Macalester College, 1600 Grand Ave, St. Paul, MN 55105 and CRADDOCK, Suzanne, Northern Arizona University, Geology Department, Flagstaff, AZ 86011, craddock@macalester.edu

WARD, William P.¹, MCCLELLAND, William C.¹, COBLE, Matthew A.² and MALONE, Shawn J.³, (1)Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA 52242, (2)Department of Geological Sciences, Stanford University, Stanford, CA 94305, (3)Department of Geosciences, Ball State University, Muncie, IN 47306, william-ward@uiowa.edu

SCIBIORSKI, Elisabeth¹, TOHVER, Eric¹ and JOURDAN, Fred², (1)School of Earth and Environment, University of Western Australia, 35 Stirling Highway, Perth, 6009, Australia, (2)Western Australian Argon Isotope Facility, John de Laeter Centre, Department of Applied Geology, Curtin University, Perth, Australia, elisabeth.scibiorski@research.uwa.edu.au

SHAW, Jessica, School of Earth and Ocean Science, University of Victoria, Bob Wright Centre, PO Box 1700 STN CSC, Victoria, CA V8W 2Y2 and JOHNSTON, Stephen T., School of Earth and Ocean Sciences, University of Victoria, Bob Wright Centre, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada, jesshaw@uvic.ca

KODAMA, Kenneth P., Earth and Environmental Sciences, Lehigh University, 1 W. Packer Ave, Bethlehem, PA 18015 and MINGUEZ, Daniel, Earth and Environmental Science, Lehigh University, 1 W Packer Ave, Bethlehem, PA 18015, kpk0@lehigh.edu

WEIL, Arlo Brandon, Department of Geology, Bryn Mawr College, Bryn Mawr, PA 19010 and YONKEE, Adolph, Department of Geosciences, Weber State University, 2507 University Circle, Ogden, UT 84408, aweil@brynmawr.edu

DEL GRECO, Kassandra¹, JOHNSTON, Stephen T.², GUTIERREZ-ALONSO, Gabriel³ and FERNÁNDEZ-LOZANO, J.³, (1)School of Earth and Ocean Sciences, University of Victoria, PO Box 1700 Station CSC, Victoria, BC V8W 2Y2, Canada, (2)School of Earth and Ocean Sciences, University of Victoria, Bob Wright Centre, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada, (3)Departamento de Geologia, Universidad de Salamanca, Salamanca, 37008, Spain, kdel@uvic.ca

HOUSEN, Bernard A., Geology, Western Washington University, 516 High St, Bellingham, WA 98225, bernieh@wwu.edu