Updated 9/20/17

CURRICULUM VITAE

Robert Curtis Walter

Address Department of Earth and Environment Franklin & Marshall College Lancaster, PA 17604-3003 Position Associate Professor of Geoscience

Phone 717-358-7198

Email [email protected]

Education

1981 - 1985 University of Toronto. Post-Doctoral Fellow, Department of Physics (Division of Geophysics) with Prof. Derek York, and Department of Geology with Prof. John A. Westgate. 1975 - 1980 Case Western Reserve University. Ph.D. 1981, Geochemistry (Prof. James L. Aronson, advisor). Dissertation Title: "The Volcanic History of the Hadar Early Man Site and the Surrounding of ". 1972 - 1975 Franklin and Marshall College. B.A. (Dean's List) 1975, Geology (Prof. Stanley A. Mertzman, advisor).

Academic Research (1) Tectonic basin analyses and fracture pattern mapping for deep groundwater exploration: (2) Development and application of geological and geochemical techniques for the investigation of impacts on the environment: (3) Water quality and watershed analyses; (4) Calibrating geological timescales; (5) Geology of human evolution. East African geology, geoarchaeology, and paleontology; interpretation of geological factors in faunal evolution, human evolution, climate change and paleoenvironments; (6) Isotope Geochemistry and Geochronology (40Ar/39Ar, fission track, 137Cs, and 210Pb systematics); (7) Petrogenisis of volcanic rocks (8) Volcanology, tephrostratigraphy, and tectonic evolution of rift and plume volcanoes; (9) Paleoclimates, paleonvironments and climate change.

Humanitarian Interests (1) The interplay of natural science and complex humanitarian emergencies; (2) Using remote sensing techniques and geological knowledge to monitor, map, and predict environmental disasters; (3) Disaster management; (4) Food security, water security, and environmental security around the globe, with an emphasis on and the Near East.

Professional Experience

2006-Present Associate Professor, Dept. of Earth and Environment, Franklin and Marshall College, Lancaster, PA 2017-Present Co-Founder, Water Science Institute, Lancaster, PA. 2016-Present Co-Founder and Chief Science Officer, Power7, Washington, D.C. 2003-2016 Chief Science Officer, EarthWater Technologies, Alexandria, VA 2011-2012 Allan Cox Visiting Distinguished Professor, Stanford University, Palo Alto, CA. 2004-2005 Visiting Professor and Presidential Fellow, Case Western Reserve University, Department of Geological Sciences, Cleveland, OH 2002-2003 AAAS Diplomacy Fellow and Science Advisor to the Humanitarian Information Unit, INR, U.S. Department of State, Washington, D.C. RCW Page 2

2000 -2002 Adjunct Associate Professor and Senior Research Associate, Department of Geosciences, Franklin and Marshall College, Lancaster, Pennsylvania, USA. 1998 - 1999 Senior Scientist, Jack Satterly Geochronology Laboratory, Royal Ontario Museum, Toronto, Canada. 1994 - 1997 Chief Geologist, Institute of Human Origins, Berkeley. 1988 - 1994 Senior Research Associate, Berkeley Geochronology Center, Institute of Human Origins, Berkeley. 1985 - 1988 Assistant Research Professor and Fellow, Center for Geochronological Research, INSTAAR and Dept. of Anthropology, University of Colorado, Boulder, CO. 1983 - 1985 Research Associate, Department of Geology, University of Toronto, Canada. 1981 - 1982 Post-Doctoral Fellow, Department of Physics, and the Department of Geology, University of Toronto, Canada. 1975 - 1980 Graduate Research Assistant, Department of Geology, Case Western Reserve University, Cleveland, OH.

Service to the College

2006 - 2010 International Off-Campus Study Committee 2011 - 2012 Work Safety Committee 2011 - 2013 Radiation Safety Committee 2013 - 2016 Faculty Council (elected) 2016 - 2017 Provost’s Campaign Advisory Council 2016 - Present College Creativity and Innovation Advisory Group 2017 - Present Professional Standards Committee (elected) 2017 - Present Faculty Fellow to the Faculty Center

Academic Projects

2010-Present Fracture Analyses of the Appalachian Ridge and Valley Province of Pennsylvania: Using remote sensing and field-based measurements to test whether fractures and fracture patterns control karst formation and orientation, and groundwater flow in non-karst regions, as well as controlling other geomporphic features in the region (Co-Investigator with Tim Bechtel). 2008-Present Big Spring Run Restoration Experiment: A landscape scale experiment to test whether reshaping floodplains, streams, and riparian wetlands impacted by Legacy Sediment will improve ecosystem function and water quality. This experiment will enable us to assess whether ecosystem function and critical services can be effectively restored (Co-PI with Dorothy Merritts). 2002-present Natural Streams and the Legacy of Water-Powered Mills: Stratigraphic, historical, geochemical and geochronological evidence of erosion and sedimentation due to human impact on landscapes and valley bottoms from Pre- to Post-Settlement time (Co-PI with Dorothy Merritts). 2003-present South Korean Neo-Tectonics: Establishing a temporal setting for recent seismic activity in South Korea, and it’s relevance to seismic hazard regulations for the construction of nuclear power facilities on the southeast coast of South Korea (Co-PI with Dorothy Merritts; in collaboration with the Korean Institute for Geology and Mining). 1994 - Present Eritrean Geology and Geoarchaeology: Geological exploration of the northern Danakil and Afar Rift basins. Basin analysis: tectonics, volcanology, sedimentology, stratigraphy, paleontology and archaeology (three field seasons approximately two months each; 1995, 1997 and 1999). Project Director. 1975 - 1994 Volcanology, Geochemistry and Geoarchaeology of the Afar Region of Ethopia: Volcanology, igneous peterology, tephrostratigraphy and volcano-tectonic evolution of the Hadar and Middle Awash Deposits, and the Afar and Main Ethiopian Rifts, (8 field seasons of approximately three months each; 1976,

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1976, 1977, 1980, 1990, 1992, 1993 and 1994); Project Co-Director since 1990. 1992 Kenyan Tectonics: Structural history of the Turkana Basin (one month). 1983 - 1986 Volcanology, petrology and geochronology of the Main Ethiopian Rift, (three field seasons of three months each; 1983, 1984, 1986), Project Director. 1980-1990 Tanzania, Geology and Geoarchaeology: Volcanology and tephrochronology of Olduvai Gorge, Laetoli, Lake Natron, and the Ngorongoro Volcanic Highlands (four field seasons of three months each; 1980, 1986, 1987, 1990). 1986 New Zealand Tephrastratigraphy: Quaternary tephrostratigraphy of the North Island (one month). 1983 Alaskan Tephrostratigraphy: Quaternary tephrostratigraphy of Alaska and Yukon (three months). 1974 California: Volcanology of the Medicine Lake shield volcano (four months).

Groundwater Exploration Projects Directed geological and geophysical research pertaining to transformational groundwater exploration projects in: Afghanistan, Alberta (Canada), California (USA), Chile, Colombia, Colorado (USA), Egypt, Ghana, Honduras, India, Jamaica, Jordan, Mexico, Nicaragua, North Dakota (USA), Pakistan, Panama, Peru, Phillipines, St. Lucia, Texas (USA), Wyoming (USA), Turkey.

Courses Taught Physical Geology; Landscape Geochemistry; Quaternary Geochronology (graduate level); Geochronology and Isotope Geochemistry (graduate level); Human Evolution in its Geological Context (undergraduate and graduate levels); Geopolitics of Afghanistan; Geopolitics of Humanitarian Crises; Visual Design for Scientists, and Geoscience Seminar (capstone course for geoscience majors).

Ph.D. Advisees

1983 - 1987 Giday WoldeGabriel, Ethiopian Citizen, Thesis Title: "Volcanic History of the Central Sector of the Main Ethiopian Rift", 1987, Geology Department, Case Western Reserve University, Cleveland, Ohio. (Co-Advisor) 1986 - 1993 Paul Clement Manega, Tanzanian Citizen, Thesis Title: "Geochronology, Geochemistry and Isotopic Study of the Plio-Pleistocene Hominid Sites and the Ngorongoro Volcanic Highland in Northern Tanzania", 1993, Geology Department, University of Colorado, Boulder, Colorado.

M.Sc. Advisees

1999-2002 Berhane Negasssi, Eritrean Citizen, Thesis Title: “Stratigtraphy of the Northern Danakil Rift Valley, . Department of Geology, University of Texas, Austin. (Co-Advisor)

B.A. Advisees Yoana Voynova (Honors), 2006; Alexandra Sullivan, 2006; Julie Weitzman (Honors), 2008; Zach Stein, 2008; Brian Hughes, 2009; Erik Ohlson, 2010; Yupu Zhao (Honors), 2010; Chris Fullinwider, 2010; Erik J. Olsen, 2011, Amy Jordan, 2011, Joe Galella, 2011, Jordan Appleyard, 2012, Danielle Verna, 2012, Peter Rippberger, 2012, Aaron Myers, 2013, Erin Peck, 2014, and Amy Moser, 2014 (Honors). A, Carter (B.A., F&M, 2015), C. Studnicki (B.A., F&M, 2016), S. Tabor (B.A., F&M, 2017)

Thesis Committees

1987 - Present R.D. Ernst (B.Sc. Honors, University of Colorado, 1987), P.B. Maat (B.Sc. Honors, University of Colorado, 1987), P.C. Manega (Ph.D., University of Colorado, 1993), T. Chernet (Ph.D. 1995, Miami University), T. Yemane

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(Ph.D., 1997, Iowa State Univ.), B. Negassi (M.Sc., 2002, University of Texas, Austin), A. Voynov (B.A., Honors, Franklin and Marshall, 2004), Y. Voynova (B.A. Honors, Franklin and Marshall College, 2006), J. Weitzman (B.A. Honors, Franklin and Marshall College, 2008), Courtney Haynes (B.A. Honors, Dickinson College, 2009), J. Herbert (B.A. Honors, Franklin and Marshall College, 2009), Erin Markey, B.A., Honors, F&M, 2015), Chi Xu, B.A., Honors, F&M, 2016).

Recent Grants

2016-2018 U.S. Natural Resource Conservation Service, Conservation Innovation Grant, Mapping Restoration Strategies. $250,000 (Co-PIs: with Joe Sweeney and Dorothy Merritts) 2016-2018 U.S. Environmental Protection Agency/PA Department of Environmental Protection Wetland Program Development Grant. Mapping Landscapes with Lidar and Developing Triage Maps for Valley Bottom Restoration Practices. $450,000 (Co-PI with Dorothy Merritts) 2013-2016 U.S. Environmental Protection Agency/PA Department of Environmental Protection Wetland Program Development Grant. Big Spring Run Restoration Experiment: Post-Restoration Monitoring for Nutrient and Sediment Load Reduction Efficiencies. $216,000 (Co-PI with Dorothy Merritts). 2011-2013 U.S. National Science Foundation, Geomorphology and Land Use Dynamics: Landscape evolution, and sediment and nutrient fluxes in a floodplain/wetland restoration experiment, $382,234 (Co-PI with Dorothy Merritts). 2010-2013 U.S. EPA and PA DEP: Statewide Bank Erosion and Nutrient Loads, $200,000. 2009-2011 U.S. National Science Foundation, Major Research Instrumentation, Acquisition of New and Upgraded Equipment for Critical Zone Laboratory at a Research- Intensive Undergraduate College, $550,000 (Co-PI with Dorothy Merritts, Stan Mertzman, Chris Williams, Claude Yoder, and Jennifer Morford). 2008-2010 Pennsylvania Department of Environmental Protection: Growing Greener Environmental Stewardship Grant for Establishing Sediment and Nutrient Reduction Efficiencies, $516,650. 2006-2009 Pennsylvania Department of Environmental Protection: Growing Greener Environmental Stewardship Grant for Statewide Bank Erosion and Nutrient Loads from Legacy Sediments, $207,131. 2006-2008 Pennsylvania Department of Environmental Protection: Growing Green I Grant, Conestoga Watershed Project for nutrient and trace element analysis of legacy sediments, $130,000. 2006 Chesapeake Bay Commission: funding for analytical equipment for nutrient analyses of legacy sediments, $109,000. 2004 Korean Institute for Geology and Mining: $40,000. 2002-2003 American Association for the Advancement of Science Diplomacy Fellowship: $65,000. 2000 CONACYT (El Consejo Nacional de Ciencia y Tecnología, Mexico): Visiting Professorship (Titular B); $50,000. 1999 Discovery Channel (Canada); Documentary Film "Hunting Hominids": on the geology, paleontology and archaeology of Eritrea, $30,000. 1999 University of Toronto, Faculty of Arts and Science and Office for Research and International Relations: "Geology, Paleontology and Prehistory of Eritrea", $70,000. 1998 Royal Ontario Museum ROM Foundation Grant: "Geology, Paleontology and Prehistory of Eritrea", $70,000. 1997 National Science Foundation, Tectonics Program: Rift Basin Development of the Danakil Depression of Eritrea, $175,000; Co-PI with Richard Buffler, University of Texas, Austin.

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1996 National Science Foundation, Geology and Paleontology Program: Geology of the Danakil and Afar Rift basins of Eritrea, $16,000. 1996 Anadarko Petroleum Corporation: Geology of the Danakil and Afar Rift basins of Eritrea, $20,000. 1995 National Science Foundation, Anthropology Program: Paleoanthropological and Geochronological Research at Hadar, Ethiopia, $200,000. (Co-PI with W.H. Kimbel and D.C. Johanson). 1994 National Science Foundation: Hadar Research Project, $25,000. (Co-PI with D.C. Johanson and W.H. Kimbel). 1990 - 1994 National Science Foundation, Anthropology Program: Paleoanthropological and Geochronological Research at Hadar, Ethiopia, $219,000. (Co-PI with W.H. Kimbel and D.C. Johanson). 1992 - 1993 National Geographic Society: Hadar Research Project, $25,000. (Co-PI with W.H. Kimbel and D.C. Johanson). 1990 - 1994 L.S.B. Leakey Foundation: Hadar Research Project, $34,500. (Co-PI with W.H. Kimbel and D.C. Johanson).

Invited Lectures (Selected)

World Water Week Session on the Groundwater Paradox, Stockholm (2017), Water Science Institute Symposium, Legacy Sediment 2.0, Lancaster (2017), West Virginia University, Morgantown (2017), Chesapeake Bay Program, Science & Technology Advisory Committee, Annapolis (2017), Chesapeake Bay Commission Annual Meeting, Lancaster (2016), U.S. Natural Resource and Conservation Service (2016), Virginia Commonwealth University (2014), University of North Carolina at Charlotte (2014), North Carolina State University (2014), Bucknell University (2013), University of Kiel, Germany (Keynote Lecture; 2013), University of Oregon (2012), Ecological Research Education Network (Keynote Lecture: 2012), University of California at Berkeley (2012), United States Geological Survey at Menlo Park (2012), Lancaster Farmland Trust (2012), Geological Society of America Kirk Bryan Lecture (2011), Pennsylvania Water Symposium (2010); Chester County Watershed Association (2009); University of Maryland, Baltimore (2008); Chesapeake Bay Commission Citizens Advisory Committee (2007); PA DEP Statewide Biologists Meeting/Stroud Water Research Center (2007); EPA National Webinar (2007); Lehigh University (2007); University of Pennsylvania (2007); PA DEP Rachel Carson Lecture Series (2007); Science and Technical Advisory Committee (STAC) of the EPA Chesapeake Bay Program (2006); University of California Berkeley (2006); PA DEP Southcentral Division (2006); Maryland DCNR (2006); Virginia Stream Alliance (2006); USEPA Chesapeake Bay Program Nutrient Subcommittee, (2005); EPA Chesapeake Bay Program Modeling Subcommittee, (2005); University of Delaware (2005); Chesapeake Bay Commission (2005); Johns Hopkins University (2005); Pennsylvania Department of Environmental Protection (2005); PA Chesapeake Bay Commission, (2004); Agricultural Issues Forum of Lancaster (2004); Ohio University (2004); Dartmouth College (2004); College of Wooster (2004); State University of New York at Stony Brook (2004); Franklin and Marshall College, Seminar Series (2003); Franklin and Marshall College Geoarchaeology Distinguished Lecture (2002); University of Pennsylvania, Department of Geoscience Lecture Series (2002); University of California at San Diego, Department of Anthropology Lecture Series, La Jolla (2001); Dublin Institute for Advanced Studies, Dublin, Ireland (2001); National Science Foundation Margins Workshop, Sinai, Egypt (2001); UCSD Project for Explaining the Origin of Modern /Salk Institute, La Jolla (2000);

Awards, Professional Service and Organizations

Water Science Institute, Co-Founder (January 2017), a non-profit organization, the Water Science Institute promotes the sustainable, science-based benefits of projects that provide available, clean water through conservation, restoration and exploration. This is accomplished through funding and administration of education, advocacy and implementation of research projects in the study of the interrelationship of water and its surroundings.

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Allen B. Cox Visiting Professorship (2011-12 Academic Year) Stanford University, Department of Geological and Environmental Sciences. Fellow, Geological Society of America (2011) Kirk Bryan Award for Excellence (Geological Society of America, 2011) For outstanding research in Quaternary Geology and Geomorphology. Senate Resolution 283 (2008) The State of Pennsylvania Senate Resolution 283: “Whereas, Professor Walter’s and Professor Merritts” scientific skills, professionalism and ability to communicate this new information has provided invaluable assistance to this Commonwealth and its partners in understanding stream dynamics and integrating this knowledge into restoration efforts of the Chesapeake Bay and its tributries…”. Legacy Sediment Work Group Co-Chair (2006-Present) By invitation of Pennsylvania Department of Environmental Protection, in recognition of pioneering research on legacy sediments and with the objective of establishing a Best Management Practice for removal of legacy sediments and floodplain restoration. Field Trips and Field Workshops (2004-Present) Over one hundred field excursions given for Federal, State, academic, non-profit, and private organizations desiring to learn about “legacy sediments” and stream evolution in the mid-Atlantic region. Geological Society of America Fieldtrip Co-Leader (2006) A one day excursion for geologists from the US and outside the US, to observe streams in southeastern Pennsylvania the impact of Colonial-era milldams on stream valleys. Presidential Fellow (2005) Case Western Reserve University Awarded to individuals who have achieved professional distinction in cultural endeavors, science, or public affairs. Conestoga Watershed Consortium Co-Founder (2004) Members include: the Government of Lancaster County, the US Geological Survey, Franklin and Marshall College, other local stakeholders and individuals, and the U.S. Army Corps of Engineers. The objectives are to document modern sediment sources in the Conestoga River system, to determine sediment erosion processes and rates throughout the Conestoga Watershed, and to mitigate erosion and sedimentation. Conestoga Watershed Consortium Fieldtrip Co-Leader (2004) A one-day tour of the Conestoga Watershed for policy makers, local and state officials, watershed groups and scientists to observe and discuss sources of sediment in streams, sites of erosion along stream banks and hill slopes, and best- management conservation practices used by local farmers to reduce erosion. Lancaster County encompasses most of the Conestoga River Watershed, which carries some of the highest amounts of sediment per unit area of all watersheds in the Susquehanna Basin. SEFOP Field Trip Co-Leader (2003): South East Friends of the Pleistocene Field Trip, Channeling Through Time: Landscape Evolution, Land Use Change, and Stream Restoration in Lancaster County, PA AAAS Diplomacy Fellow (2002-2003): American Association for the Advancement of Science (AAAS) Fellowship to the Bureau of Intelligence and Research (INR), U.S. Department of State. Member (2002-Present): American Association for the Advancement of Science (AAAS). Member (2001): NSF-Margins Working Group on Rupturing of the Continental Lithosphere. Member (2000-Present): The La Jolla Initiative for Explaining the Origins of Humans. An interdisciplinary scientific consortium based in La Jolla California. Associate Editor (1993-98): Quaternary Geochronology (Quaternary Science Reviews). Organizing Committee (1994): Eighth International Conference on Geochronology (ICOG-8), Berkeley. Guest Editor (1992): Quaternary International. Fellow (1989-Present): The California Academy of Science. Chairman (1985): Working Group on "Dating Tephras", Commission on Tephrochronology, INQUA. Founding Member (1983): Commission on Tephrochronology: International Quaternary Association. Fellow (1978-Present): Sigma Xi, the scientific research society. Publication and Book Reviewer: Contributions to Mineralogy and Petrology; Geophysical Research Letters; Arctic and Alpine Research; Journal of Human Evolution; Quaternary International; Nature. Grant Reviewer: National Science Foundation (U.S.); NERC (United Kingdom), L.S.B. Leakey Foundation (U.S.); National Geographic Society (U.S.).

Selected Publications (*Undergraduate Students)

Walter, R., Merritts, D. Patapova, M., Hilgartner, W., Bowne, D., Johnson, R., Moore, J., 2017, Wetland Program Development in Support of Pennsylvania’s Aquatic Resource Protection and Management

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Action Plan, Program Focus Area 3: Headwater Aquatic Resource Restoration Monitoring: Report to the Pennsylvania Department of Environmental Protection, 67 p (plus figures, data files and photo/video archives). Longenecker, J., T. Bechtel, Z. Chen, N. Goldscheider, T. Liesch, and R. Walter, 2017, Correlating Global Precipitation Measurement satellite data with karst spring hydrographs for rapid catchment delineation, Geophys. Res. Lett., 44, 4926–4932, doi:10.1002/2017GL07379 0. http://onlinelibrary.wiley.com/doi/10.1002/2017GL073790/abstract Elliott, Sara J., Grettenberger, Christen L., Donovan, Michael P., Wilf, Peter, Walter, Robert C., and Merritts, Dorothy J. 2016. Riparian and valley-margin hardwood species of pre-colonial Piedmont forests: A preliminary study of subfossil leaves from White Clay Creek, southeastern Pennsylvania, USA. Palaeontologia Electronica 19.1.2A: 1-26 Walter, Robert, Merritts, Dorothy, Rahnis, Michael, Langland, Michael, Galeone, Daniel, Gellis, Allen, Hilgartner, William, Bowne, David, Wallace, John, Mayer, Paul, and Forshay, Ken, 2014, Big Spring Run floodplain-wetland aquatic resources restoration project: Report to Pennsylvania Department of Environmental Protection, 78 p (plus figures, data files, GIS shapefiles, and photo archives). Available at:( http://www.bsr- project.org/uploads/2/6/5/2/26524868/big_spring_run_aquatic_ecosystem_restoration_monitoring_r eport_2013.pdf. Weitzman, J., Forshay, K., Kaye, J., Mayer, P., Koval, J., Walter, R., 2014, Potential nitrogen and carbon processing in a landscape rich in mill-dam legacy sediment. Biogeochemistry. DOI 10.1007/s10533- 014-0003-1 Anders, M.H., Rodgers, D. W., Hemming, S.R., Saltzman, J., DiVinere, V., Hagstrum, J.T., Embree, G.F., and Walter, R.C., 2014. A fixed sub-lithospheric source for the late Neogene track of the Yellowstone hotspot: Implications of the Heise and Picabo Volcanic Fields. J. Geophys. Res., DOI: 10.1002/2013JB010483 Merritts, D.J., Walter, R.C., Rahnis, M., Hartranft, J, Cox, S., Scheid, C., Potter, N., Jenschke, M., Reed, A., Matuszewski, D., Kratz, L., Manion, L., Shilling, A., Datin, K., 2013, The rise and fall of Mid- Atlantic streams: Millpond sedimentation, milldam breaching, channel incision, and stream bank erosion. in DeGraff, J.V., and Evans, J.E., eds., The Challenges of Dam Removal and River Restoration: Geological Society of America Reviews in Engineering Geology, v. XXI, p. 183–203, doi:10.1130/2013.4021(14). Elliott, S.J., Wilf, P., Walter, R.C., Merritts, D.J., 2013, Subfossil Leaves Reveal a New Upland Hardwood Component of the Pre-European Piedmont Landscape, Lancaster County, Pennsylvania. PLoS ONE 8(11): e79317. doi: 10.1371/journal.pone.0079317 Hartranft, J , Merritts, D., Walter, R., and and Rahnis, M., 2011, The Big Spring Run Restoration Experiment: Geomorphology, Aquatic Ecosystems, and Policy in the Big Spring Run Watershed, Lancaster County, PA. Sustain 24, 24-31. Merritts, D., Walter, R., Rahnis, M., Hartranft, J., Cox, S., Potter, N., Hilgartner, W., Langland, M., Manion, L.*, Lippincott, C.*, Siddiqui, S.*, Rehman, Z.*, Scheid, C.*, Kratz, L.*, Shilling, A.*, Jenschke, M.*, Datin, K.*, Cranmer, E.*, Reed, A.*, Matuszewski, D.*, Voli, M.*, Ohlson, E.*, Deng, W.*, Neugebauer, A.*, Ahamed., A.*, Neal, C.*, Winter, A.*, and Becker, S.*, 2011. Anthropocene Streams: Human Agents in Base-Level Forcing, Philosophical Transactions of the Royal Society of London 369, 976-1009. Brantley, S., Menonigal, P., Scatena, F., Balogh-Brunstad, Z., Barnes, R., Bruns, M., Van Cappelen, P., Dontsova., K., Hartnett, H., Hartshorn, T., Heismath, A., Herndon, E., Jin, L., Keller, C., Leake, J., McDowell, W., Meinzer, F., Mozdzer, T., Petsch, S., Pett-Ridge, J., Pregitzer, K., Raymond, P., Riebe, C., Shumaker, K., Sutton-Grier, A., Walter, R., Yoo, K., 2011, Twelve testable hypothesis on the geobiology of weathering. Geobiology. DOI: 10.1111/j.1472-4669.2010.00264.x Buffler, R.T., Walter, R.C., Ghebretensae, B.N., Bruggemann, J.H., Guillaume, M.M.M., Berhe, S.M., McIntosh, W., Park, L.E., 2010. Geologic setting of the Abdur Archaeological Site on the Red Sea coast of Eritrea, Africa. Global and Planetary Change 72, 429-450. Merritts, D., Walter, R., and Rhanis, M., 2010, Sediment and nutrient loads from stream corridor erosion along breached millponds. Pennsylvania Department of Environmental Protection Report, 147p. Voli, M.*, Merritts, D., Walter, R., Ohlson, E.*, Datin, K.*, Rahnis, M., Kratz, L.*, Deng, W.*, Hilgartner, W., and Hartranft, J., 2009, Preliminary reconstruction of a Pre-European Settlement Valley Bottom Wetland, Southeastern Pennsylvania. Water Resources Impact 11, 11-13.

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Walter R.C. and Merritts, D.J., 2008. Natural Streams and the Legacy of Water-Powered Mills. Science 319, 299-304. Walter, R.C. and Merritts, D.J., 2008. What to do About these Dammed Streams. Science, 321, 911-912. Walter, R.C. and Merritts, D.J., 2008. Dammed You Say. Science Online: http://www.sciencemag.org/cgi/eletters/319/5861/299 Shoshani, H., Walter, R.C., Berhe, S., Libsekal, Y. and Abraha, M., 2006., Paleoenvironments of Late Oligocene Gompothere from Dogali, Eritrea. Proceedings of the National Academy of Science. Bruggemann, J.H., Buffler, R.T., Guillaume, M.M., Walter, R.C., von Cosel, R., Ghenretensae, N., Berhe, S., 2004. Stratigraphy, paleoenvironments and model for the deposition of the Abdur Reef Limestone: Context for an important archaeological site from the last interglacial on the Red Sea coast of Eritrea. Palaeogeography, Palaeolclimatology, Palaeoecology 203, 179-206. Faure, H., Walter, R.C. and Grant, D.E., 2002, The coastal oasis: Ice Age springs on emerged continental shelves, Global and Planetary Change, 33/1-2, 47-56. Westgate, J.A., Preece, S.J., Froese, D.G., Walter, R.C., Sandu, A.S., and Scherger, C.E., 2001, Dating Early and Middle (Reid) Pleistocene Glaciations in Central Yukon by Tephrochronology, Quaternary Research 56, 335-348. Shoshani, J., Walter, R.C., Libsekal, Y., Berhe, S., Buffler, R.T., and Negassi, B., 2001, Elephas recki from Dandero, Northern Danakil Depression, Eritrea. La Terra degli Elefanti, Cavarreta, G., Gioa, P, Mussi, M. and Palompo, M.R. eds., 143-147. Walter, R.C., et. al., 2000, Early human occupation of the Red Sea coast of Eritrea during the last interglacial, Nature 405, 65-69. WoldeGabriel, G., Walter, R.C., Hart, W.K., Mertzman, S.A., and Aronson, J.L., 1999, Temporal relations and geochemical features of felsic volcanism in the central sector of the Main Ethiopian Rift, Acta Volcanologica 11, 53-67. Walter, R.C., 1998. Potassium-Argon/Argon-Argon Dating. In: Chronometric and Allied Dating in Archaeology (R.E. Taylor and M. Aitken, eds.), Advances in Archaeology and Museum Science, Plenum Press, 97-127. Chernet, T., Hart, W.K., Aronson, J.L., and Walter, R.C., 1998, New age constraints on the timing of volcanism and tectonism in the northern main Ethiopian Rift-southern Afar transition zone, Journal of Volcanology and Geothermal Research, 80, 267-280 Kimbel, W.H., Walter, R.C. and Johanson, D.C., et al., 1996, Late Pliocene Homo and Oldowan tools from the Hadar Formation (Kada Hadar Member). Ethiopia, Journal of Human Evolution, 31, 549-561. Johanson, D.C., Kimbel, W.H., Walter, R.C., Vondra, C., Yemane, T., Aronson, J.L., Eck, G.G., Rak, Y., Hovers, E., Reed, K.E., and Bobe-Quinteros, R., 1995, Fossil collecting; discussion, Science 268, 1113. Clark, J.D., de Heinzelin, J., Schick, K.D., Hart, W.K., White, T.D., WoldeGabriel, G., Walter, R.C., Suwa, G., Asfaw, B., Vrba, E., Selassie, Y.H., 1994, African Homo erectus: Old Radiometric Ages and Young Oldowan Assemblages in the Middle Awash, Ethiopia, Science, 264, 1907-1910. Walter, R.C., 1994, The Age of and the First Family: Single-Crystal 40Ar/39Ar Dating of the Denen Dora and lower Kada Hadar Members of the Hadar Formation, Ethiopia, Geology, 22, 6-10. Juvigne, E., Geeraerts, R., Geissert, F., Gregor, J.-J., Hottenrott, M., Hus, J.J., Seidenschwaan, G., Walter, R.C., 1994, A Pleistocene stratotype at Alsenau (Vorspessart, Germany). In, Proc. 29th Int'l. Geol. Congt. Part B, E.H. Juvigné ed., VSP-International, Utrecht, The Netherlands, A.237-249. Renne, P.R., Deino, A.L., Walter, R.C., Turrin, B.D., Swisher, C.C., Becker, T.A., Curtis, G.H., Sharp, W.D. and Jaouni, A.-R., 1994, Intercalibration of astronomical and radioisotopic time, Geology 22, 783-786. White, T.D., Suwa, G., Hart, W.K., Walter, R.C., WoldeGabriel, G., de Heinzelin, J., Clark., J.D., Asfaw, B., Vrba, E., 1993, New Pliocene Hominids from Maka, Ethiopia, Nature, 366, 261-265. Walter. R.C., and Aronson, J.L., 1993, Age and Source of the Sidi Hakoma Tuff, Hadar Formation, Ethiopia, Journal of Human Evolution, 25, 229-240. Renne, P.R., Walter, R.C., Verosub, K.L., Sweitzer, M., and Aronson, J.L., 1993, New Data from the Hadar Formation (Ethiopia) Confirm Astronomically Calibrated Geomagnetic Polarity Time Scale to 3.3 Million Years Ago, Geophysical Research Letters, 20, 1067-1070. Waythomas, C.F., Lea, P.D., and Walter, R.C., 1993, Stratigraphic Context of Old Crow Tephra, Holitna Lowland, Interior Southwest Alaska, Quaternary Research, 40, 20-29.

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Ebinger, C.J., Yemane, T., WoldeGabriel, T., Aronson, J.L., and Walter, R.C., 1993, Late Eocene-Recent volcanism and faulting in the southern main Ethiopian rift, Journal of the Geological Society, London, 150, 99-108. Walter, R.C., Manega, P.C., Hay, R.L., 1992, Tephrochronology of Bed I, Olduvai Gorge: An Application of Laser-fusion 40Ar/39Ar Dating to Calibrating Biological and Climatic Change, Quaternary International, 13/14, 37-46. Asfaw, B., Beyene, Y., Suwa, G., Walter., R.C., White., T.D., WoldeGabriel, G., Yemane, T., 1992, The Earliest Acheulian from Konso-Gardula, Nature, 360, 732-734. WoldeGabriel, G., Walter, R.C., Aronson, J.L., and Hart, W.K., 1992, Geochronology and Distribution of Silicic Volcanic Rocks of Plio-Pleistocene Age from the Central Sector of the main Ethiopian Rift, Quaternary International, 13/14, 69-76. Hart, W.K., Walter, R.C., and WoldeGabriel, G., 1992, Tephra Sources and Correlations in Ethiopia: Application of Elemental and Neodymium Isotope Data, Quaternary International, 13/14, 77-86. Westgate, J.A., Walter, R.C., Naeser, N., 1992, Tephrochronology; stratigraphic applications of tephra, Quaternary International, 13/14, 1-2. WoldeGabriel, G, White, T.D., Suwa, G., Semaw, S., Beyene, Y., Asfaw, B., and Walter, R.C., 1992, Kesem-Kebena: A Newly Discovered Paleoanthropology Research Area in Ethiopia, Journal of Field Archaeology, 19, 471-493. Walter, R.C., Manega, P.C., Hay, R.L., Drake, R.E., and Curtis, G.H., 1991, Laser-fusion 40Ar/39Ar Dating of Bed I, Olduvai Gorge, Tanzania, Nature, 354, 145-149. Kauffman, D., Walter, R.C., Brigham-Grette, J., and Hopkins, D.M., 1991, Age of the Middle Pleistocene Nome River glaciation, northwestern Alaska, Quaternary Research, 36, 277-293. WoldeGabriel, G., Aronson, J.L., and Walter, R.C., 1990 Geology, geochronology, and rift development of the central sector of the Main Ethiopian Rift. Geological Society of America Bulletin 102, 439-458. Hart, W.K., WoldeGabriel, G., Walter, R.C., and Mertzman, S.A., 1989, Basaltic volcanism in Ethiopia; Constraints on continental rifting and mantle interactions. Journal of Geophysical Research, 94, 7731-48. Walter, R.C., 1989, Applications and limitations of fission-track geochronology to Quaternary tephras, Quaternary International, 1, 35-46. Walter, R.C., 1989, Tephrostratigraphy and tephrochronology. In: S.L. Forman, ed., “Dating Methods Applicable to Quaternary Geological Studies in the Western United States”. Utah Department of Natural Resources Misc. Pub 98-7, 54-60. Walter, R.C., 1989, Applications of K/Ar and 40Ar/sAr dating to Quaternary geology. In: S.L. Forman, ed., “Dating Methods Applicable to Quaternary Geological Studies in the Western United States”. Utah Department of Natural Resources Misc. Pub 98-7, 61-66. Johanson, D.C., Masao, F., Eck, G., White, T.D., Walter, R.C., Kimbel, W.H., Manega, P., 1987, New partial skeleton of Homo habilis from Olduvai Gorge, Tanzania. Nature, 327, 205-209. Walter, R.C., Hart, W.K., and Westgate, J.L., 1987, Petrogenesis of a -rhyolite tephra from the west- central Afar, Ethiopia. Contributions to Mineralogy and Petrology, 95, 462-480. Westgate, J.A., Walter, R.C., Pearce, W., and Gorton, M.P., 1985, Geochemistry, age and distribution of the Old Crow tephra, Yukon and Alaska. Canadian Journal of Earth Science, 22, 893-906. Hall, C.M., Walter, R.C., Westgate, J.A., and York, D., 1984, The Cindery Tuff in Pliocene hominid- bearing sediments of the Middle Awash, Ethiopia: Geochronology, stratigraphy and geochemistry. Nature, 308, 26-31. Clark, J.D., Asfaw, B, Assefa, G., Harris, J.W.K., Kurishina, H., Walter, R.C., White, T.D., and Williams, M.A.J., 1984, Paleoanthropological discoveries in the Middle Awash valley. Nature, 307, 423-428. Aronson, J.L., Walter, R.C., and Taieb, M., 1983, Comment. Nature, 306, 209-210. Hart, W. K. and Walter, R. C., 1983, Geochemical investigation of volcanism in the west-central Afar, Ethiopia, Year Book - Carnegie Institution of Washington 82, 491-497. Walter, R.C. and Aronson, J.L., 1982, Revisions of K/Ar ages for the Hadar hominid site, Ethiopia. Nature, 296, 122-127. Schmitt, T.J., Walter, R.C., Taieb, M., Tiercelin, J-J., and Page, N., 1980, Magnetostratigraphy of the Hadar Formation of Ethiopia. Proc. VIII Pan-African Congress, Leakey, R.E. and Ogot, B.A., eds., National Museum of Kenya, Nairobi.

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Aronson, J.L., Walter, R.C., Taieb, M., and Naeser, C.W., 1980, New geochronological information for the Hadar Formation and the adjacent central Afar. Proc. VIII Pan-African Congress, Leakey, R.E. and Ogot, B.A., eds., National Museum of Kenya, Nairobi. Aronson, R.C., Schmitt, T.J., Walter, R.C., Taieb. M., Tiercelin, J-J., Naeser, C.W., and Nairn, A.E.M., 1977, New geochronological and paleomagnetic data for the hominid-bearing Hadar Formation of Ethiopia. Nature, 267, 323-337.

Invited Papers and Selected Abstracts (* Former or Current Undergraduate students)

Walter, R., Merritts, D., Rahnis, M., Gellis, A., Hartranft, J., Mayer, P., Langland, M., Forshay, K., Weitzman, J.*, Schwarz, E., Bai.*, Blair, A., Carter, A.,* Sosenko-Daniels, S.*, Lewis, E.*, Ohlson, E.*, Peck, E.*, Schulte, K.*, Smith, D.*, Stein, Z.*, Verna, D.*, and Wilson, E.*, 2017, Sediment Budgets and Sources Inform a Novel Valley Bottom Restoration Practice Impacted by Legacy Sediment: The Big Spring Run, PA, Restoration Experiment. American Geophysical Union Annual Meeting, New Orleans. Merritts, D., Rahnis, M., Walter, R., Snyder, N., Hartranft, J., Lewis, E.*, Snyder-Fair, A.*, Lewis, L.*, Meissner, J.*, Coplan., D.*, Wagner., D.*, 2017, LiDAR-Difference Estimates of Erosion Rates after Dam Removal and/or Breaching in the Mid-Atlantic USA, the Region with Highest National Number of Dam Removals. American Geophysical Union Annual Meeting, New Orleans. Forshay, K., Weitzman, J.*, Mayer, P., Liu, X., Keeley, A., Copeland, M., Deng, X.*, Merritts, D., Walter, R., 2016, The influence of legacy sediment removal on stream floodplain nitrate and organic carbon composition in sediments and groundwater following restoration. Ecological Society of America Annual Meeting, Ft. Lauderdale. Mayer. P., Audie., M., Brooks, R., Forshay, K., Merritts., D., Walter., R., 2015, Effects of legacy sediment removal on hydrology and biogeochemistry in a first order stream in Pennsylvania, USA. Ecological Society of America Annual Meeting. Schulte, Kayla*, Blair, Aaron, Merritts, Dorothy, Walter, Robert, and Rahnis, Michael, 2014, The Big Spring Run, PA, Project: Experimenting with restoration of an Anthropocene stream: Geological Society of America (Northeastern Section) 49th Annual Meeting Abstracts with Programs, Vol. 46, No. 2, p.83. Walter, Robert, Merritts, Dorothy, Langland, Michael, Galeone, Daniel, Rahnis, Michael, Gellis, Allen, Schulte, Kayla*, Blair, Aaron, Smith, Douglas*, and Peck, Erin*, 2014, The Big Spring Run Restoration Experiment: Long-term monitoring of sediment sources and budgets in a 1st order piedmont stream: Geological Society of America (Northeastern Section) 49th Annual Meeting Abstracts with Programs, Vol. 46, No. 2, p.91. Merritts, Dorothy, Walter, Robert, Rahnis, Michael, Langland, Michael, Galeone, Daniel, Gellis, Allen, Hilgartner, William, Mayer, Paul, Adeuya, Roxanne, Falkner, Bart, and Forshay, Ken, 2013, Mid- Atlantic Stream Conference, Baltimore, MD, Evaluating a New Approach to Aquatic Resource Restoration, Big Spring Run, Pennsylvania (http://midatlanticstream.org/?page_id=937). Larsen, Laurel, Merritts, Dorothy, Walter, Robert, and Watts, Danielle, 2013, Reciprocal vegetation-flow feedbacks driving early-stage landscape evolution in a restored wet meadow: AGU, San Francisco, CA. Abstract ID: H33A-1338. Bowne, D.R., C. Grand Pre, J. Hartranft, W. Hilgartner, D. Merritts, A. Miller, M. Rahnis, and R. Walter, 2013, Is bog turtle (Glyptemys muhlenbergii) habitat buried under 250 year-old sediment? Re- evaluating conventional wisdom concerning habitat loss: International Congress for Conservation Biology, Baltimore, MD. Hilgartner, W., D. Merritts, R. Walter, M. Rahnis, J. Hartranft, D. Bowne, A. Miller, C. Grand Pre, and C. Bernhardt, 2013, Millennial Stability and Post-settlement Burial of Bog Turtle (Glyptemys muhlenbergii) Habitat in Two Piedmont Valleys of Maryland and Pennsylvania: International Congress for Conservation Biology, Baltimore, MD. Walter, R., D. Merritts, D. Bowne, J. Hartranft, W. Hilgartner, C. Grand Pre, P. Mayer, M. Rahnis, and A. Miller, 2013, Habitat Restoration in Watersheds Impacted by Legacy Sediments and Implications for the Bog Turtle (Glyptemys muhlenbergii): International Congress for Conservation Biology, Baltimore, MD. Mayer, P., Cooper. C., Forshay, K., Kaushal, S., Langland., M., Low., D., Merritts., D., Sivirichi, G., Walter., R., 2012, Approaches to characterizing biogeochemistry effects of groundwater and surface

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water interaction at the riparian interface. American Water Resource Association Annual Conference. Walter, R.C., Merritts, D.J., Sternberg, R., Sosenko, S.*, and Weaver, I.,* 2009, The Application of Magnetic Susceptibility to Unraveling Sedimentation Histories in Stream Valleys of the Mid- Atlantic Piedmont, United States. International Association of Geomagnetism and Aeronomy, Soporon, Hungary. Walter, R.C., Merritts, D.J., Voli, M.*, Scheid, C.*, Hartranft, J., Hilgartner, W., and Rahnis, M., 2008, Buried Wetlands: The Origin and Evolution of Pre-Settlement Piedmont Valley Bottoms in Pennsylvania and Maryland. American Geophysical Union, San Francisco, CA. Walter, R.C., Sullivan, A.*, Voynova, Y.*, Stubblefield, A., Merritts, D., & Ritchie, G., 2006, A 137Cs Inventory of a Small Watershed in Lancaster County, PA, and Implications for Sediment and Nutrient Loads to the Chesapeake Bay, Geological Society of America Annual Meeting, Philadelphia, PA. Walter, R.C. and Merritts, D.J., 2006, The Great Sediment Experiment: Mill Dams and the Legacy of Sediment Storage, Geological Society of America Annual Meeting, Northeast Section, Harrisburg, PA. Merrtts, D.J., Walter, R.C., Lippincott, C.* and Siddiqui, S.*, 2004, Cause of high sediment yields of the Conestoga River Watershed to the Susquehanna River and Chesapeake Bay. American Geophysical Union Abstracts with Programs. Merritts, D.J. and Walter, R.C., 2003. Colonial mill ponds of Lancaster County as a major source of sediment pollution to the Susquehanna River and Chesapeake Bay. In: Channeling Through Time: Landscape Evolution, Land Use Change, and Stream Restoration in the Lower Susquehanna Basin. Southeastern Friends of the Pleistocene Fall 2003 Fieldtrip Guidebook, p. 56-65. Merritts, D.J., Voynov, A.*, Walter, R.C., Lepp, M.*, and Bennett, W.*, 2003. Channel-bank erosion and monumented channel cross sections in the Conestoga River drainage basin. In: Channeling Through Time: Landscape Evolution, Land Use Change, and Stream Restoration in the Lower Susquehanna Basin. Southeastern Friends of the Pleistocene Fall 2003 Fieldtrip Guidebook, p. 56-65. Shoshani, J., Walter, R.C., Libsekal, Y., Abraha, M., Berhe, S., 2001, The oldest gomphothere in Africa: a latest Ologicene proboscidean from the Dogali Formation, eastern Eritrea. Eighth International Theriological Cngress, Sun City (South Africa), 12-17 August 2001. Walter, R.C., 2001, Volcanic History of the Afar Region of Ethiopia and Eritrea: Implications for Regional Tectonics. MARGINS Education and Planning Workshop: Rupturing of Continental Lithosphere in the Red Sea/Gulf of Suez, March 17-23, 2001, Sharm-el-Sheikh, Sinai, Egypt, p. 51. Buffler, R.T. and Walter, R.C., 2001, Rift basins and rift processes in the southern Red Sea – northern Danakil region, Eritrea. MARGINS Education and Planning Workshop: Rupturing of Continental Lithosphere in the Red Sea/Gulf of Suez, March 17-23, 2001, Sharm-el-Sheikh, Sinai, Egypt, p. 12-13. Fletcher, J.M., Eakins, B.W., Sedlock, R.L., Mendoza-Borunda, R., Walter, R.C., Edwards, R.L., Dixon, T.H., 2000, Quaternary and Neogene slip history of the Baja-Pacific plate margin of Baja California. AGU Fall Meeting 2000, p. F1232 . Bruggemann, H., Guillaume, M., von Cosel, R., Buffler, R., Walter, R., 2000, Pleistocene reefs in the southern Red Sea as foraging habitats for hominids. Proceedings of the Ninth International Coral Reef Symposium, Bali, Indonesia 23-27 October 2000, p. 74. Fletcher, J.M., Eakins, B.W., Sedlock, R.L., Mendoza-Borunda, R., Walter, R.C., Edwards, R.L., Dixon, T.H., 2000, Quaternary slip across the Baja-Pacific plate margin. GEOS Union Geofisica Mexicana 20, p. 219. Westgate, J.A., Preece, S.J., Scheger, C.E., Walter, R.C., 1999, Tephrochronology dates two extensive Cordilleran glaciations in the Yukon Territory, Canada. Geological Society of America 31. no 7, 367. Walter, R.C., 1998, The First Red Sea Exodus, Rotunda (Fall/Winter). Walter, R.C., 1998. Potassium-Argon/Argon-Argon Dating. In: Chronometric and Allied Dating in Archaeology (R.E. Taylor and M. Aitken, eds.), Advances in Archaeology and Museum Science, Plenum Press, 97-127. Walter, R.C. 1997, Reconnaissance Geology of the Danakil Depression of Eritrea. IGCP Conference on Continental Rifts, Dublin Institute of Advanced Studies, Dublin, Ireland.

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Walter, ,R. C., Buffler, R. T., Berhe, S., Vondra, C., Yemane, T. , and Andemariam, T., 1997, Rift tectonics and sedimentation in the southern Red Sea and northern Danakil of Eritrea, Geological Society of America, Abstracts with Programs 29 (6), 47. Aronson, J.L., Vondra, C., Yemane, T., Walter, R.C., 1996, Character of the disconformity in the upper part of the Hadar Formation. Abstract with programs – Geological Society of America 28 (6), 28. Vondar, C.F., Yemane, T., Aronson, J.L., Walter, R.C., 1996, A major disconformity within the Hadar Formation. Abstract with programs – Geological Society of America 28 (6), 69. Yemane, T., Vondra, C.F., Aronson, J.L., Walter, R.C., 1996, Provenance, Tectonics and climate change: Kada Hadar Member, Hadar Formation, Ethiopia. Abstract with programs – Geological Society of America 28 (6), 72. Smith, P. E., York, D., Chen, Y., Evensen, N. M., Walter, R. C., 1996, 40Ar- 39Ar dating of late Pleistocene volcanic glass from Santorini; a Theran hyalo-sphenochron, Eos 77 (46), 794-795. Walter, R.C., 1994, Tephrochronology of the Hadar and Middle Awash Deposits of Ethiopia, ICOG-8, Berkeley, California. Woldegabriel, G., Heiken, G., White, T.D., Hart, W.K., Walter, R.C., 1994, Volcanism and the paleoanthropological record. Abstract with programs – Geological Society of America 26, 263. Karson, J.A., Hurst, S.D., Walter, R.C., 1993, Footwall deformation associated with Cenozoic detachment faulting in the Turkana Rift, Kenya: record of low-angle slip. Abstract with programs – Geological Society of America 25, 474. Walter, R.C., Deino, A.D., Renne, P.R., and Tauxe, L., 1992, Refining the Plio-Pleistocene GPTS using laser-fusion 40Ar/39Ar tephrochronology; Case studies from the East African Rift, Eos. Transactions, American Geophysical Union 73, No. 43, 628. Renne, P.R., Walter, R.C., Verosub, K.L., Sweitzer, M., and Aronson, J.L., 1992, Magnetostratigraphy and 40Ar/39Ar Dating of the Hadar Fm., Ethiopia: GPTS Calibration within the Gauss Chron, Eos. Transactions, American Geophysical Union 73, No. 43, 633. Walter, R.C. and Froggatt, P.C., 1992, Single-Crystal 40Ar/39Ar Dating of Plagioclase from the late- Pleistocene Mount Curl Tephra, New Zealand, EOS, 73, No. 14, 362. Shane, P., Walter, R.C., and Froggatt, P., 40Ar/39Ar ages for Pleistocene silicic tephras in New Zealand; implications for the age of the Jaramillo Subchron, Geol. Soc. N.Z. 63A, 139. Walter, R.C. and Geller, B.A., 1992, Age of Telluride Stage Mineralization from Single-Crystal 40Ar/39Ar Dating of Vein-Deposited Adularia, Eos. Transactions, American Geophysical Union 73, No. 14, 362. Froggatt, P. and Walter, R.C., 1992, Single-crystal 40Ar/39Ar dating of plagioclasae from the late Pleistocene Mount Curl Tephra, New Zealand, Eos. Transactions, American Geophysical Union 73, No. 14 362-363. Easterbrook, D. J. Berger, G. W., Walter, R.,1992, Laser argon and TL dating of early and middle Pleistocene glaciations in the Puget Lowland, Washington, Geological Society of America, Cordilleran Section, 88th annual meeting, Abstracts with Programs 24 (5), 22. Walter, R.C., 1990, 40Ar/39Ar Laser Microprobe Dating of Bed I Olduvai Gorge, In: "Tephrochronology and Hominid Evolution in East Africa", INQUA Inter-Congress Committee on Tephrochronology Field Conference and Workshop, Yellowstone National Park. Walter, R.C., 1990, Tephrochronology and Source of the SHT and Tulu Bor Tephras, In: "Tephrochronology and Hominid Evolution in East Africa", INQUA Inter-Congress Committee on Tephrochronology Field Conference and Workshop, Yellowstone National Park. Walter, R.C., Manega, P.M., Farmer, G.L., Hart, W.K., 1990, Geochemical and temporal constraints on magma genesis of the Ngorongoro volcanic highland, Tanzania. Abstract with programs – Geological Society of America 27, 108. Walter, R.C., 1989, Fission-Track Dating and Vertebrate Paleontology. Special Symposium on "Geochronologic Techniques and Their Application to Vertebrate Paleontology", Journal of Vertebrate Paleontology 9, 42A. Walter, R.C., 1989, Tephrostratigraphy and tephrochronology. In: S.L. Forman, ed., “Dating Methods Applicable to Quaternary Geological Studies in the Western United States”. Utah Department of Natural Resources Misc. Pub 98-7, 54-60. Walter, R.C., 1989, Applications of K/Ar and 40Ar/39Ar dating to Quaternary geology. In: S.L. Forman, ed., “Dating Methods Applicable to Quaternary Geological Studies in the Western United States”. Utah Department of Natural Resources Misc. Pub 98-7, 61-66.

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Hart, W.K., Woldegabriel, G., Walter, R.C., Mertzman, S.A., 1989, Mantle and basaltic magma evolution in a continental rift: evidence from the Ethiopian volcanic province. Bulletin – New Mexico Bureau of Mines & Mineral Resources 131, 122. Constenious, K.N., Dawson, M.R., Pierce, H.G., Walter, R.C., Wilson, M.V., 1989, Reconnassiance paleontological study of the Kishenehn Formation, northwestern Montana and southeastern British Columbia. In: Field Conference – Montana Geological Society. French, D.E., Grabb, R. F. (editors), Volume I (1), 189-203 Walter, R.C., Hart, W.K., 1988, Nd isotopes as stratigraphic prevenance and petrogenetic indicators for rhyolitic tephras. Abstract with programs – Geological Society of America 20, 113-114. Walter, R.C. , 1987, Application and limitation of of fission track geochronology to Quaternary tephras. Congress for the International Union of Quaternary Research July 31-Aug 9, 283. Walter, R.C., 1987, Fission track isochrons: resplving the age of contaminated tephra. Congress of the International Union of Quaternary Research July 31-Aug 9, 283. Walter, R.C., 1987, Geochronology and hominid evolution; contributions and advances in the K/Ar, 40Ar/39Ar and fission track systems. Abstract with programs – Geological Society of America 19, 880. Woldegabriel, G., Aronson, J.L., Walter, R.C., 1987, Volcanism and rifting in the central sector of the Main Ethiopian Rift (MER). Abstract with programs – Geological Society of America 19, 895. Hart, W.K., Giday, W.G., Aronson, J.L., Walter, R.C., Mertzman, S.A., Westgate, J.A., 1987, Evolution of mafic volcanism in the Main Ethiopian Rift (MER). Abstract with programs – Geological Society of America 19, 695. Hart, W.K., Walter, R.C., 1986, Crust/mantle processes along the western Afar Margin, Ethiopia. Abstract with programs – Geological Society of America 18, 630. Lea, P.D., Waythomas, C.F., Walter, R.C., 1986, Distribution of Old Crow Tephra in southwestern Alaska: implications for the Old Crow eruption and the late-Pleistocene glacial history. Abstract with programs – Geological Society of America 16, 668. Hall, C.M., Walter, R.C., York, D., 1985, Tuff above “Lucy” is over 3 Ma old. Eos. Transactions of the American Geophysical Union 66, 257. Walter, R.C., Giday, W.G., Westgate, J.A., 1985, Correlation of ash flow tuffs with distal air fall tephra: significance for Pliocene tephrostratigraphy of hominid-bearing sediments. Abstract with programs – Geological Society of America 17, 743. Hart, W.K., Giday, W.G., Walter, R.C., Mertzman, S.A., 1985, Geochemistry of late Miocene from the western margin of the main Ethiopian Rift. Abstract with programs – Geological Society of America 17, 604. Walter, R.C., Westgate, J.A., Giday, W.G., Aronson, J.L., Hart, W.K., 1985, Geochemical and temporal patterns of felsic volcanism in Ethiopia. Abstract with programs – Geological Society of America 17, 743. Walter, R.C., Westgate, J.W., Hart, W.K., Aronson, W.K., 1984, Tephrostratigraphic correlation of the Sidi Hakoma Tuff and the Tulu Bor tuffs; Nd isotope and new trace element data. Abstract with programs – Geological Society of America 16, 686. Hart, W.K., Walter, R.C., 1984, Nd isotopes and trace elements on Pliocene rhyolitic glass shards from the Afar region, Ethiopia. Abstract with programs – Geological Society of America 16, 531. Westgate, J.A. , Walter, R.C., 1983, The stratigtaphic significance of tephra. Abstract with programs – Geological Society of America 15, 717. Hart, W.K., Walter, R.C., 1983, Nd-Sr systematics of the west-central Afar volcanic field, Ethiopia. Eos. Transactions, American Geophysical Union 64, 337. Walter, R.C., York, D., Aronson, J.L., 1981, K/Ar and 40Ar/39Ar geochronology of the Kadada Moumou Basalt from the hominid-bearing Hadar Formation. Abstract with programs – Geological Society of America 13, 575. Mertzman, S.A., Walter, R.C., 1976, The early development of the Medicine Lake shield volcano. Abstract with programs – Geological Society of America 8, 395.

Documentary Films (Co-Writer and Co-Producer):

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Walter, R.C., Vaughan. M. and Smithwalter, G., 1999, “Part 1: Where the Bones Are”, Aired on the Discovery Channel (Canada), September 6, 1999. The film and text can be viewed at www.exn.ca (search "Eritrea"). Walter, R.C., Vaughan. M. and Smithwalter, G., 1999, “Part 2: Handaxe Hill”, Aired on the Discovery Channel (Canada), September 7, 1999. The film and text can be viewed at www.exn.ca (search "Eritrea"). Walter, R.C., Vaughan. M. and Smithwalter, G., 1999, “Part 3: Pleistocene Park”, Aired on the Discovery Channel (Canada), September 8, 1999. The film and text can be viewed at www.exn.ca (search "Eritrea"). Walter, R.C., Vaughan. M. and Smithwalter, G., 1999, “Part 4: The Dating Game”, Aired on the Discovery Channel (Canada), September 9, 1999. The film and text can be viewed at www.exn.ca (search "Eritrea"). Walter, R.C., Vaughan. M. and Smithwalter, G., 1999, “Part 5: Out of Africa”, Aired on the Discovery Channel (Canada), September 10, 1999. The film and text can be viewed at www.exn.ca (search "Eritrea").