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of American State Geologists. Nora K. Foley, U.S. Geo- FIELD TRIPS
logical Survey, nfoley@usgs.gov; Arthur Merschat, U.S. Trip registration opens in December. For additional informa-
Geological Survey, amerschat@usgs.gov; William L. Las- tion, please contact the Field Trip Co-Chairs: Mark Carter,
setter, Virginia Division of Geology and Mineral Resources, mcarter@usgs.gov, and Chris Swezey, cswezey@usgs.gov.
william.lassetter@dmme.virginia.gov.
The Central Appalachian Orogen: From Ancient Tectonics
T20. Defining 3D Geologic Mapping in the Eastern North to Modern Seismicity. Christopher M. Bailey, College of
America. Christopher Bernhardt, U.S. Geological Survey, William & Mary, cmbail@wm.edu; Callan Bentley, Northern
cbernhardt@usgs.gov; Peter Chirico, U.S. Geological Survey, Virginia Community College, cbentley@nvcc.edu; Frank J.
pchirico@usgs.gov. Pazzaglia, Lehigh University, fjp3@lehigh.edu; Allan Pitts,
University of Camerino, pitts.alan@gmail.com.
T21. Geologic Maps, Digital Geologic Maps, Geophysical
Maps, and Derivatives from Geologic and Geophysical Geology and Geomorphology of the Trout Rock Caves
Maps (Posters). Randy L. Kath, University of West Georgia, (Hamilton Cave, Trout Cave, New Trout Cave), Pendleton
rkath@westga.edu; Thomas J. Crawford, University of West County, West Virginia. Christopher Swezey, U.S. Geological
Georgia, crawfordthomasj@gmail.com. Survey; cswezey@usgs.gov.
T22. What Are We Dating?: The Utility of Petrochronology Geology and the Civil War at the North Anna River Fall
in Linking Accessory Mineral Dates to Rock Forming Zone, Virginia. Christopher M. Bailey, Dept. of Geology,
Processes. Thomas “Alex” Johnson, University of California William & Mary, cmbail@wm.edu.
Santa Barbara, tajohnson@ucsb.edu; Ryan McAleer, U.S.
Geological Survey, rmcaleer@usgs.gov. The Geology of Washington, D.C. Callan Bentley, Northern
Virginia Community College, cbentley@nvcc.edu; Christopher
T23. New Developments in the Understanding of Pre- Roemmele, West Chester University, croemmele@wcupa.edu.
Appalachian Rocks of Eastern North America. Brent
Miller, Texas A&M University, bvmiller@geo.tamu.edu; Military Geology of the Manassas Battlefield Area, ×2.
Brent Owens, College of William & Mary, beowen@wm.edu; John C. Jens, U.S. Army Geospatial Center, jcjens@earthlink.net.
Sandra Barr, Acadia University, sandra.barr@acadiau.ca.
Accreted Forearc, Continental, and Oceanic Rocks of
T24. Timescales and Conditions of Appalachian Metamor- Maryland’s Eastern Piedmont: The Potomac Terrane,
phism. Cosponsors: GSA Geochronology Division; Baltimore Terrane, and Baltimore Mafic Complex. Rebecca
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Kavage Adams, Maryland Geological Survey, rebecca.adams@
Division; GSA Structural Geology and Tectonics Division. maryland.gov; William Junkin, Maryland Geological Survey,
Calvin Mako, Bates College, cmako@bates.edu; Alexandra william.junkin@maryland.gov; David K. Brezinski, Maryland
Nagurney, Virginia Tech, nagurney@vt.edu. Geological Survey, david.brezinski@maryland.gov.

T25. Using Microstructural Analysis to Investigate Macroscale Age and Tectonic Significance of Diamictites at the
Structural Features. Cosponsor: GSA Structural Geology Devonian–Mississippian Transition in the Central
and Tectonics Division. Jamie Levine, Appalachian State Appalachian Basin. F.R. Ettensohn, University of Kentucky,
University, levinejs@appstate.edu; Jeffrey Rahl, Washington fettens@uky.edu; Clay Seckinger, University of Kentucky,
& Lee University, RahlJ@wlu.edu. clayseckinger@icloud.com.
T26. Deciphering Active Tectonics and Seismic Hazard in East- Proterozoic and Paleozoic Tectonic Evolution of the
ern North America. Lisa S. Schleicher, Defense Nuclear Northern Shenandoah Massif. Bill Burton, U.S. Geological
Facilities Safety Board, LisaS@dnfsb.gov; J. Wright Horton, Survey, bburton@usgs.gov; Richard Tollo, The George
U.S. Geological Survey, whorton@usgs.gov; Chris Cramer, Washington University, rtollo@gwu.edu; John Aleinikoff,
University of Memphis, ccramer@memphis.edu; Christine A. U.S. Geological Survey, jaleinikoff@usgs.gov; Paul C. Hackley,
Powell, University of Memphis, capowell@memphis.edu. U.S. Geological Survey, phackley@usgs.gov.
T27. Appalachian Petrology: A Session to Honor the Career SPECIAL EVENT
of Dr. Robert J. Tracy. Willis Hames, Auburn University, Experience Capitol Hill: Geoscience and Public Policy in
hameswe@auburn.edu; Nicholas M. Ratcliffe, U.S. Geologi- Washington, D.C. Kasey White, Geological Society of
cal Survey, ratcliffe2@gmail.com; Craig Dietsch, University America, kwhite@geosociety.org.
of Cincinnati, dietscc@ucmail.uc.edu; Mark Caddict, Virginia
Tech University, caddick@vt.edu. WORKSHOPS
Clastic and Carbonate Petrology—From Hand Samples
to Thin Sections. John Haynes, James Madison University,
haynesjx@jmu.edu; Mercer Parker, U.S. Geological Survey,
mercerparker@usgs.gov.

52 GSA Today | September 2019