Associated Societies GSA has a long tradition of collaborating with a wide range of partners in pursuit of our mutual goals to advance the geosciences, enhance the professional growth of society members, and promote the geosciences in the service of humanity. GSA works with other organizations on many programs and services. As the Society looks to the future, it aims to build strong, meaningful partnerships with societies and organizations across the country and around the world in service to members and the larger geoscience community. AASP - The American Association American Geophysical American Institute American Quaternary American Rock Association for the Palynological Society of Petroleum Union (AGU) of Professional Association Mechanics Association Sciences of Limnology and Geologists (AAPG) Geologists (AIPG) (AMQUA) (ARMA) Oceanography (ASLO) American Water Asociación Geológica Association for Association of Association of Earth Association of Association of Geoscientists Resources Association Argentina (AGA) Women Geoscientists American State Science Editors Environmental & Engineering for International (AWRA) (AWG) Geologists (AASG) (AESE) Geologists (AEG) Development (AGID) Blueprint Earth (BE) The Clay Minerals Colorado Scientific Council on Undergraduate Cushman Foundation Environmental & European Association Society (CMS) Society (CSS) Research Geosciences (CF) Engineering Geophysical of Geoscientists & Division (CUR) Society (EEGS) Engineers (EAGE) European Geosciences Geochemical Society Geologica Belgica Geological Association Geological Society of Geological Society of Geological Society of Union (EGU) (GS) (GB) of Canada (GAC) Africa (GSAF) Australia (GSAus) China (GSC) Geoscience Society of New Zealand Geological Society of Geological Society of Geoscience Geoscience Society of German Geological Groundwater History of Earth London (GSL) South Africa (GSSA) Information Society New Zealand (GSNZ) Society (GV) Resources Association Sciences Society (GSIS) of California (GRA) (HESS) International Association International Association International Association International International International International Medical for Geoscience Diversity for Promoting Geoethics of Emergency Managers Association of Association of Association of Geology Association (IAGD) (IAPG) (IAEM) GeoChemistry (IAGC) Hydrogeologists (IAH) Limnogeology (IMGA) 96 2018 GSA Annual Meeting & Exposition National and international societies with consistent aims and missions of advancing the geosciences and/or science in general are invited to affiliate with GSA as Associated Societies. For further information, or if your organization’s contact person has changed, please contact GSA’s Executive Director at [email protected]. International Society Israel Geological Karst Waters Institute Microanalysis Society Mineralogical The Mineralogical Mineralogical Society for Aeolian Research Society (IGS) (KWI) (MAS) Association of Canada Society (MS) of America (MSA) (ISAR) (MAC) ® NGWThe Groundwater A Association Minnesota Ground National Association National Association National Association National Cave and National Earth Science National Ground Water Association of Black Geoscientists of Geoscience of State Boards of Karst Research Teachers Association Water Association (MGWA) (NABG) Teachers (NAGT) Geology (ASBOG®) Institute (NCKRI) (NESTA) (NGWA) Nepal Geological Paleontological Paleontological Seismological Society Sigma Gamma Epsilon Sociedad Geológica Società Geologica Society (NGS) Research Institution Society (PS) of America (SSA) (SGE) Mexicana, A.C. Italiana (SGI) (PRI) (SGM) Society for American Society for Environmental Society for Mining, SEPM (Society for Society for the Preservation Society of Economic Society of Exploration Archaeology (SAA) Geochemistry and Health Metallurgy & Sedimentary Geology) of Natural History Geologists (SEG) Geophysicists (SEG) (SEGH) Exploration (SME) Collections (SPNHC) Society of Vertebrate Soil Science Society of Western Interior Paleontology (SVP) America (SSSA) Paleontological Society (WIPS) 4–7 November • Indianapolis, Indiana, USA 97 Organizing Committee Thanks to the GSA 2018 Organizing Committee General Chair: Todd Thompson Technical Program Chair: Kevin Mickus Technical Program Vice-Chair: Amy Brock-Hon Todd Thompson Kevin Mickus Amy Brock-Hon Field Trip Chair: Lee Florea Outreach Chair: Polly Root Sturgeon Host Organization: Indiana Geological & Water Survey Lee Florea Polly Root Sturgeon Renew Early Renew your 2019 SAVE* 15% off Membership Dues *members in high income GSA Membership Today economies Scientific Division Memberships Geographic Section Affiliations Journal Subscriptions GSA Foundation Support Renew or Join at www.geosociety.org/members www.geosociety.org/members GSA MEMBERSHIPGSA 2019 P.O. Box 9140, Boulder, CO 80301-9140, USA • Phone: +1-888-443-4472 • E-mail: [email protected] 98 2018 GSA Annual Meeting & Exposition Joint Technical Program Committee Representatives 2018 Technical Program Chair: Kevin L. Mickus Quaternary Geology and Geomorphology Division: Tammy 2018 Technical Program Vice-Chair: Amy L. Brock-Hon Rittenour, Grant Meyer Sedimentary Geology Division: Ryan Morgan, Piret Plink-Bjorklund Associated Societies Soils and Soil Processes Division: Neil J. Tabor, Gary Association of Earth Science Editors: Monica Gaiswinkler Stinchcomb, Zsuzsanna Balogh-Brunstad Easton Structural Geology and Tectonics Division: Andy Barth, Geochemical Society: Matthew E. Brueseke Paul Kapp Geoscience Information Society: Chris Badurek Mineralogical Society of America: Philip Brown Representatives at Large National Association of Geoscience Teachers: Don Duggan- GSA International: Mary Hubbard Haas, John Taber Marine Coastal Geology: Duncan M. Fitzgerald, Joseph T. Kelley Paleontological Society: Matthew E. Clapham, Erin Saupe Paleoclimatology and Paleoceanology: Miriam E. Katz Society for Sedimentary Geology: Piret Plink-Bjorklund Precambrian Geology: Julia Baldwin Society of Economic Geologists: Garth E. Graham GSA Divisions Continental Scientific Drilling Division: James Russell Environmental and Engineering Geology Division: Stephen L. Slaughter, Anne Witt Energy Geology Division: Laura S. Ruhl, Marc L. Buursink Annual Program Geoarchaeology Geology Division: Richard K. Dunn, Laura Murphy Committee Geobiology & Geomicrobiology Division: Lydia Schiavo Chair: Lisa E. Park Boush Tackett, Carie Frantz Amy L. Brock-Hon Geoinformatics Division: Denise J. Hills, Xiaogang Ma Craig J.R. Hart Geology and Health Division: Saugata Datta, Tom Darrah Kevin L. Mickus Geology and Society Division: Bruce Clark, David Szymanski Larry D. McKay Geophysics and Geodynamics Division: Benjamin Drenth, Diane Doser Richelle M. Allen-King Geoscience Education Division: Robyn Mieko Dahl, Rónadh Cox Elizabeth Petrie Sarah George History and Philosophy of Geology Division: Michael S. Smith, Renee M. Clary Hydrogeology Division: Yu-Feng Forrest Lin, Randy Stotler Karst Division: Andrew James Luhmann, Jonathan B. Sumrall, Jason Polk Limnogeology Division: Jeffery Stone, Scott W. Starratt Mineralogy, Geochemistry, Petrology, and Volcanology Division: John W. Shervais, Rosemary Hickey-Vargas Planetary Geology Division: Debra Buczkowski, Debra Needham, Sharon A. Wilson Purdy 4–7 November • Indianapolis, Indiana, USA 99 Session Cosponsor Organizations Sponsor Recognition—Session GSA Soils and Soil Processes Division Cosponsor Organizations GSA Structural Geology and Tectonics Division Heritage Stone Subcommission of the International Union of Geological Sciences AASP - The Palynological Society History of Earth Sciences Society American Association of Petroleum Geologists Indiana Geological and Water Survey American Geophysical Union International Association for Geoscience Diversity American Geosciences Institute International Association of GeoChemistry American Institute of Professional Geologists International Association of Limnogeology American Quaternary Association International Association of Sedimentologists Ann Johnson Institute for Science, Technology & Society International Mineralogical Association Association for the Sciences of Limnology and Oceanography International Society of Aeolian Research Association for Women Geoscientists International Society of Groundwater for Sustainable Development Association of American State Geologists (ISGSD) Association of Environmental & Engineering Geologists International Subcommission on Stratigraphic Classification Climate Literacy and Energy Awareness Network (CLEAN) (ISSC) Council on Undergraduate Research Geosciences Division International Water Association (IWA) Cushman Foundation Journal of Maps Deep Carbon Observatory Kentucky Geological Survey Earth Science Women’s Network Microanalysis Society EarthRates Mineralogical Society of America EARTHTIME National Association of Geoscience Teachers Gemological Institute of America National Association of Geoscience Teachers Geo2YC Division Geochemical Society National Association of Geoscience Teachers Geoscience Geoscience Information Society Education Research Division GSA Continental Scientific Drilling Division National Association of Geoscience Teachers Teacher Education GSA Diversity in the Geosciences Committee Division GSA Energy Geology Division National Association of Geoscience Teachers GSA Environmental & Engineering Geology Division National Cave and Karst Research Institute GSA Foundation National Earth Science Teachers Association GSA Geoarchaeology Division National Ground Water