MICHAEL H. ORTSchool of Earth Sciences and Environmental Sustainability

Northern Arizona UniversityFlagstaff, AZ 86011(928) 523-9363 Work

Education

University of California, Santa Barbara; Geological Sciences, 1985 - 1991. Ph.D., June, 1991. Thesis committee chair: R.V. Fisher.

University of California, Santa Cruz, 1979-1984: B.S., Earth Sciences, 1984. Senior Thesis: Geochemistry and petrography of Bodie Hills volcanic rocks, eastern California.

Reed College, 1978-1979; no degree received.

Professional Experience

Professor, Northern Arizona University, 8/08 - present Associate Professor, Northern Arizona University. 8/00 – 7/08 Visiting Professor (Fulbright Scholar), Universidad de Buenos Aires, Argentina. 3/01 – 6/01 Visiting Researcher, Trinity College Dublin, Ireland. 6/00-9/00 Assistant Professor, Northern Arizona University. 1/95 - 7/00 Visiting Professor (Fulbright Scholar), University of Bucharest, Romania. 2/94 – 7/94 Research Fellow, Northern Arizona University; Research including 1) Geochemical study of magma

sources for the San Francisco volcanic field, 2) Anisotropy of magnetic susceptibility study of flow directions in the Campanian Tuff, Naples, Italy, 3) Correlation of maar deposits and eruptive events at Ukinrek Maars, Alaska, and 4) Geologic and petrologic study of the Raton-Clayton volcanic field, New Mexico. 1/91 – 1/97.

Temporary Assistant Professor, Northern Arizona University. Taught introductory geology courses and a graduate-level course in Isotope Geology. 1992

Visiting Researcher, Los Alamos National Laboratory, 10/93 – 12/95 Field Geologist, Arizona Geological Survey, Tucson, AZ. 1993 Adjunct Professor, College of Santa Fe, 10/92 – 12/97 Visiting Assistant Professor, University of California, Santa Barbara, 4/91 – 12/95 Research Assistant, UC Santa Barbara; Ph.D. dissertation-related research: field work in Argentina

and Bolivia, and geochemical, isotopic, petrographic, and paleomagnetic analysis of samples. R.V. Fisher, supervisor. 1986 - 1990.

Research Assistant, Gran Canaria, Canary Islands, Spain; Emplacement mechanisms and sampled flows for isotopic analysis. November - December, 1988.

Research Assistant, Mount Saint Helens; Field work with R.V. Fisher, researched May 18, 1980, blast and its depositional mechanisms. August-September, 1986.

Co-instructor, School for Field Studies, Cambridge, MA; field volcanology course at Kilauea volcano, Hawaii. June-July, 1986.

Teaching Assistant, UC Santa Barbara: Lab courses in igneous petrography, optical mineralogy, rock identification, summer field geology, introductory geology, and oceanography. 1985 - 1990.

Physical Science Technician, US Geological Survey, Menlo Park: Field mapping, K/Ar dating, drafting, geochemical analysis of igneous and metamorphic rocks from the North Cascades, WA. R.W. Tabor, supervisor, 1984 - 1985.

X-Ray geochemistry lab technician, UC Santa Cruz. K.L. Cameron, supervisor. 1983 - 1984.

Professional Organizations

Geological Society of AmericaAmerican Geophysical UnionInternational Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI)IAVCEI Commissions on Explosive Volcanism (CEV) and Volcanogenic Sediments (CVS) Sigma Xi Scientific Honors Society

Grants/Awards

Institut de Physique du Globe de Paris, Collaboration to study the Bellecombe Ash eruption, Piton de La Fournaise, Reunion Island, $8000, May-June 2014.

National Park Service-CESU, Determining an accurate date for the Sunset Volcanic eruption, using tree-ring chemical analysis, $8285, 09/13 – 09/14.

National Science Foundation, EAR-1322081, Collaborative Research: Understanding the Causes of Highly Explosive Basaltic Eruptions Using the AD 1085 Sunset Crater Eruption and its Deposits, $119,999, 07/01/2013 – 06/30/2016.

National Science Foundation, EAR-1156953, Collaborative Research: REU Site: Integrative approach to landscape evolution in a monogenetic volcanic field. San Francisco volcanic field, northern Arizona, $350,000, co-I.

USGS ARRA, Reconstructing the 2008 Okmok Eruption from Tephra Stratigraphy: Implications for Volcanic Hazards from Aleutian Phreatomagmatic Eruptions, $119,319, 02/01/2010 – 09/30/2011.

National Park Service-CESU, Workshop to Develop Best Practices for Trails Design and Construction on Volcanic Features, $11,500, 4/15/09 – 5/31/12.

USGS EDMAP, Map of the Volcanic Geology of the First Flat Mesa Area, Hopi Buttes (Tsézhin Bií), Navajo Nation, Arizona, $6838, 5/09-4/10.

National Science Foundation, EAR-0739087, Collaborative Research: Crystal- and Lithic-Rich Fallout at Quilotoa Volcano, Ecuador: Vent Processes During Short-Lived Hiatuses in Violent Eruptions, $85,784, 07/01/08 – 06/30/11.

National Science Foundation, EAR-0538206, Collaborative Research: Spatiotemporal Evolution of the Neogene Ignimbrite Flare-up in the Altiplano-Puna Volcanic Complex, Central Andes: Insights into the Development of Large Silicic Magmatic Systems, $34,814 NAU portion ($360,000 total), 4/15/06 – 4/14/08.

NAU E-Learning Grants, Engaging students through problem-oriented, inquiry-based field research and enhanced technology in introductory environmental sciences laboratories, $20,095, 3/05 – 6/06, D. Anderson, PI.

National Science Foundation, EAR-0409117, Collaborative research: Dendrochronological, volcanological, and archaeological study of cinder cone eruptions of Parícutin and Sunset Crater, $59,530 NAU portion ($180,000 total), 8/04 – 7/06.

USGS-CESU, Volcanological Investigation in Tsezhin Bii' Region of the Navajo Nation, $21,167. 7/04-9/04.

USGS EDMAP, Map of the Volcanic Geology of the Deshgish Butte Area, Hopi Buttes (Tsézhin Bií), Navajo Nation, Arizona, $6000, 5/03-4/04.

Western National Parks Association, Little Springs volcanology and archaeology project, $7500, 12/02-12/03.

National Park Service, Tree-ring sampling of Parícutin volcano, Mexico, $7500, 9/02-9/03.National Park Service, Geologic Mapping of Walnut Canyon National Monument, $25,000,

9/02-10/03.NAU Intramural Grant, Geochemistry Research Using a Functioning X-Ray Fluorescence

Spectrometer, 7/02-6/03, $10,000.NAU Intramural Grant, Acquisition of a Paleomagnetism Laboratory for the Department of

Geology, 7/02-6/03, $8,000, T. Hoisch, PI.National Science Foundation, Acquisition of a high resolution inductively coupled plasma mass

spectrometer for research in chemistry and earth sciences, $407,620, M. Ketterer, PI; 10/01-9/04.

NAU Intramural Grant, The Caviahue Caldera, Argentina: Hazards and Energy Potential, 7/01-6/02, $10,750.

J. William Fulbright Foreign Scholarship, Argentina, 2001, three monthsSouthwest Parks and Monuments Assn., Origin of cinders in Wupatki National Monument, 12/99

- 11/00, $7260.NAU Organized Research Grant, Volcanoes and sediments in the Hopi Buttes, 7/99-6/00, $7,000Department of Energy, The use of water hyacinth to remove metal contaminants in aquatic

ecosystems, 10/98 - 9/99, $19,250, with C. Kelley and N. Johnson.NAU Organized Research Grant, Uranium/Thorium disequilibrium dating of young geological

materials, 7/98-6/99, $7,750United States Geological Survey EDMAP, Volcanic Geology of the Sunflower Butte Area, Hopi

Buttes (Tsézhin Bií), Navajo Nation, Arizona, 5/98-4/99, $8,000 Department of Energy, The fate of metal contaminants in aquatic ecosystems, 10/97 - 9/98,

$29,700, with C. Kelley and C. Hartzell.NAU Organized Research Grant, Heavy metal sequestration in aquatic plants, 7/97 - 6/98,

$18,300,United States Geological Survey EDMAP, Volcanic Geology of the Wood Chop Mesa Area,

Hopi Buttes (Tsézhin Bií), Navajo Nation, Arizona, 5/97-4/98, $7,500 National Science Foundation Grant DUE-9650522, The Center for Aquatic Environmental

Studies - A miniature controllable aquatic ecosystem for the study of biogeochemistry: 7/96 - 6/99, $53,034 total,.

National Science Foundation, DUE95-5521, Advanced Technologies and Simulations for Learning about Interactions in Complex Environments (AT-SLICE); J. Tashiro, PI, 3/96 - 2/99, $449,000.

NAU Organized Research Grant, Hopi Buttes as a long-term paleoclimate study site, 7/96-6/97, $9,810

New Zealand Foundation for Research, Science and Technology, Collaborative Proposal: Catastrophic flooding, lahars, and large explosive eruptions; 4/96-12/99, $17,523.

U.S. Fish and Wildlife Service, Gas seep and spring sampling in the vicinity of Gas Rocks, south shore of Becharof Lake; 8/95, Expenses (~$3000)

J. William Fulbright Foreign Scholarship, Romania, 1994, six monthsNational Science Foundation Grant EAR-9304430, Correlation of Phreatomagmatic

Depositional Features with Eruptive Events at the Ukinrek Maars, Alaska: 6/93-5/96, $41,500

U.S. National Park Service Grant CA7029-2-0017, A Geologic Study of Capulin Volcano and Raton-Clayton Volcanic Field: 10/92-9/98, $36,523 (w/ W. Sayre at College of Santa Fe)

National Science Foundation Grant INT90-03232, U.S. - Italy Cooperative Research: The Campanian Ignimbrite eruption and emplacement: 1990-1992, $18,250 (to R.V. Fisher)

Geological Society of America Research Grants: 1986, 1987, 1988National Research Council Graduate Fellowship Alternate, 1985

Publications

Peer-Reviewed Articles:

Elson, M.D., Ort, M.H., Anderson, K.C., in press, Sunset Crater and Little Springs Volcano eruptions: Disaster management in the 11th century A.D. prehistoric Southwest; in How, Why, and Beyond: Exploring Cause and Explanation in Historical Ecology, Demography, and Movement, Herhahn, C., and Ramenofsky, A.F. (eds.). University of Colorado Press, Boulder.. 50 p text, four figures.

Ort, M.H., Porreca, M. & Geissman, J.W., 2015, Introduction to The use of palaeomagnetism and rock magnetism to understand volcanic processes: in Ort, M.H., Porreca, M. & Geissman, J.W. (eds) The use of palaeomagnetism and rock magnetism to understand volcanic processes. Geological Society, London, Special Publications, 396, p. 1-11, http://dx.doi.org/10.1144/SP396.17.

Ort, M.H., Newkirk, T.N., Vilas, J.F., Vazquez, J.A., 2015, Towards the definition of AMS facies in the deposits of pyroclastic density currents: in Ort, M.H., Porreca, M. & Geissman, J.W. (eds) The use of palaeomagnetism and rock magnetism to understand volcanic processes. Geological Society, London, Special Publications, 396, p. 205-226, http://dx.doi.org/10.1144/SP396.8.

Elson, M.D., Ort, M.H., Sheppard, P.R., Samples, T.L., Anderson, K.C., and May, E.M., in press, A.D. 1064 No More? A multidisciplinary re-evaluation of the date of the eruption of Sunset Crater volcano, northern Arizona; University of Utah Press, 68 p. 7 figures, 3 tables.

Elson, M.D., Ort, M.H., and Heidke J.M., in press, Effects of the ca. A.D. 1100 Sunset Crater eruption on local populations, northern Arizona. In Proceedings of the 2002 Chacmool Conference, Calgary, Alberta. University of Calgary, Alberta, Canada, 20 manuscript pages.

Ort, M.H., de Silva, S.L., Jiménez C., N., Jicha, B.R., Singer, B.S., 2013, Correlation of ignimbrites using characteristic remanent magnetism and anisotropy of magnetic susceptibility, central Andes, Bolivia; Geochemistry, Geophysics, Geosystems, v. 14, p. 141-157, doi: 10.1029/2012GC004276.

Elson, M.D., Ort, M.H., 2012, Fire in the sky: The eruption of Sunset Crater Volcano, in Downum, C., ed., Hisatsinom: Ancient peoples in a land without water. School for Advanced Research, Santa Fe, p. 26-33.

Elson, M.D., Ort, M,H., Anderson, K.C., Heidke, J.M., Sheppard, P.R., and Samples T.L., 2011, In the shadow of the volcano: Prehistoric settlement in the U.S. 89 Project Area. In M.D. Elson (ed.) Sunset Crater Archaeology: The history of a volcanic landscape. Prehistoric settlement in the shadow of the volcano, Anthropological Papers No. 37, Center for Desert Archaeology, Tucson, p. 187-211. 

Elson, M.D., Ort, M.H., Sheppard, P.R., Samples, T.L., Anderson, K.C., May, E.M., and Street, D.J., 2011, Sunset Crater Volcano. In M.D. Elson (ed.) Sunset crater archaeology: The history of a volcanic landscape. Prehistoric settlement in the shadow of the volcano, Anthropological Papers No. 37, Center for Desert Archaeology, Tucson, p. 103-129.

Salisbury, M.J., Jicha, B.R., de Silva, S.L., Singer, B.S., Jiménez-C., N., Ort, M.H . , 2011, 40Ar/39Ar chronostratigraphy of Altiplano-Puna Volcanic Complex ignimbrites reveals the development of a major silicic magmatic province; Geological Society of America Bulletin, v. 123, p. 821–840, doi: 10.1130/B30280.1.

Austin-Erickson, A., Ort, M.H., Carrasco-Núñez, G., 2011, Rhyolitic phreatomagmatism explored: Tepexitl Tuff Ring (Eastern Mexican Volcanic Belt), Journal of Volcanology and Geothermal Research, v. 201, p. 325-341.

Sheppard, P.R., May, E.M., Ort, M.H., Anderson, K.C., Elson, M.D., 2010, Dendrochronological responses to a tornado. in Stoffel, M., Bollschweiler, M., Butler, D.R., Luckman, B.H. (eds.), Tree-Ring analysis in natural hazards research: A state-of-the-art, Advances in Global Change Research 41, Springer: Heidelberg, London, New York, p. 305–307.

Sheppard, P.R., Ort, M.H., Anderson, K,C., Clynne, M.A., May, E.M., 2009, Multiple dendrochronological responses to the eruption of Cinder Cone, Lassen Volcanic National Park, California, Dendrochronologia, v. 27, p. 213-221.

Ort, M.H., Carrasco-Núñez, G., 2009, Lateral vent migration during phreatomagmatic and magmatic eruptions at Tecuitlapa Maar, east-central Mexico, Journal of Volcanology and Geothermal Research, v. 181, p. 67-77, doi:10.1016/j.jvolgeores.2009.01.003.

Sheppard, P.R., Ort, M.H., Anderson, K.C., Elson, M.D., Vázquez-Selem, L., Clemens, A.W., Little, N.C., and Speakman, R.J. 2008. Multiple dendrochronological signals indicate the eruption of Parícutin Volcano, Michoacán, Mexico. Tree-Ring Research 64(2):97-108.

Austin-Erickson, A., Büttner, R., Dellino, P., Ort, M.H., and Zimanowski, B., 2008, Phreatomagmatic explosions of rhyolitic magma: Experimental and field evidence, Journal of Geophysical Research, 113, B11201, doi:10.1029/2008JB005731.

Ort, M.H., Elson, M.D., Anderson, K.C., Duffield, W.A., and Samples, T.L., 2008, Variable effects of cinder-cone eruptions on prehistoric agrarian human populations in the American Southwest, Journal of Volcanology and Geothermal Research, v. 176, p. 363-376.

Pioli, L., Lanza, R., Ort, M.H., Rosi, M., 2008, Magnetic fabric, welding texture and strain fabric in the Nuraxi tuff, Sardinia, Italy, Bulletin of Volcanology, v. 70, p. 1123-1137.

Ort, M.H., Elson, M.D., Anderson, K.C., Duffield, W.A., Hooten, J.A., Champion, D.E., and Waring, G., 2008, Effects of scoria-cone eruptions upon nearby human communities, Geological Society of America Bulletin, v. 120, p. 476-486.

Hooten, J.A., Ort, M.H., and Elson, M.D., 2007, Chapter 6. The origin of cinders in Wupatki National Monument, in Elson, M.D., [ed.], Sunset Crater archaeology: The history of a volcanic landscape. Environmental analyses, Anthropological Papers No. 33, Center for Desert Archaeology, Tucson, p. 77-85.

Hooten, J.A., and Ort, M.H., 2007, Chapter 7. Sunset Crater tephra mapping project: The creation of an isopach map, in Elson, M.D., [ed.], Sunset Crater archaeology: The history of a volcanic landscape. Environmental analyses, Anthropological Papers No. 33, Center for Desert Archaeology, Tucson, p. 87-93.

Ort, M.H., Elson, M.D., and Champion, D.E., 2007, Chapter 8. A paleomagnetic dating study of Sunset Crater, in Elson, M.D., [ed.], Sunset Crater archaeology: The history of a volcanic

landscape. Environmental analyses, Anthropological Papers No. 33, Center for Desert Archaeology, Tucson, p. 95-102.

Elson, M. D., Ort, M.H., Anderson, K.A., and Heidke, J.M., 2007, Living with the volcano: the 11th century A.D. eruption of Sunset Crater. In Living under the shadow: Cultural impacts of volcanic eruptions: Walnut Creek, Left Coast Press, p. 107–132.

Carrasco-Nuñez, G., Ort, M.H., and Romero, C., 2007, Anatomy of a maar volcano: Case study of Atexcac crater, eastern Mexico; Journal of Volcanology and Geothermal Research, v. 159, p. 179-197.

Elson, M.D., Ort, M.H., and Philips, B.G., 2006, Environmental Setting, in Elson, M.D., [ed.], Sunset Crater Archaeology: The history of a volcanic landscape. Introduction and site descriptions, Anthropological Papers No. 30, part 1, Center for Desert Archaeology, Tucson, p. 17-42.

Vazquez, J.A., and Ort, M.H., 2006, Facies variation of eruption units produced by the passage of single pyroclastic surge currents, Hopi Buttes volcanic field, USA; Journal of Volcanology and Geothermal Research, 154:222–236.

Duffield, W., Riggs, N., Kaufman, D., Champion, D., Fenton, C., Forman, S., McIntosh, W., Hereford, R., Plescia, J., and Ort, M., 2006, Multiple constraints on the age of a Pleistocene lava dam across the Little Colorado River at Grand Falls, Arizona; Geological Society of America Bulletin, 118:421-429.

Ort, M.H., Anderson, D.E., and Ostergren, D.M., 2006, Integrating Policy and Land Management Issues into a Natural Sciences Education: Teaching Environmental Sciences on the lower San Juan River, Utah, Journal of Geoscience Education, v. 53, p. 116-122.

Sheppard, P.R., May, E.M., Ort, M.H., Anderson, K.C., Elson, M.D., 2005, Dendrochronological responses to the 24 October 1992 tornado at Sunset Crater, northern Arizona; Canadian Journal of Forest Research, 35:2911-2919.

Dallegge, T.A., Ort, M.H., McIntosh, W.C., 2003, Mio-Pliocene chronostratigraphy, basin morphology and paleodrainage relations derived from the Bidahochi Formation, Hopi and Navajo Nations, northeastern Arizona: The Mountain Geologist, v. 40, no. 3, pp. 55-82.

Ort, M.H., Orsi, G., Pappalardo, L., and Fisher, R.V., 2003, Anisotropy of magnetic susceptibility studies of depositional processes in the Campanian Ignimbrite, Italy; Bulletin of Volcanology, 65:55-72.

Elson, M.D., Ort, M.H., Hesse, S. J., Duffield, W.A., 2002, Lava, corn, and ritual in the northern Southwest; American Antiquity, 67:119-135.

Hooten, J.A., Ort, M.H., 2002, Peperite as a record of early stage phreatomagmatic fragmentation processes: An example from the Hopi Buttes Volcanic Field, Navajo Nation, Arizona, USA, Journal of Volcanology and Geothermal Research, 114:95-106.

Dallegge, T.A., Ort, M.H., McIntosh, W.C., and Perkins, M.E., 2001, Age and depositional basin morphology of the Bidahochi Formation and implications for the ancestral upper Colorado River; in Young, R., and Spamer, E.E., [eds.], Colorado River origin and evolution, Grand Canyon Association, Grand Canyon Symposium Monograph, pp. 47-51.

Szakacs, A., Ort, M.H., 2001, Comments on the article “Erosion calderas: origins, processes, structural and climatic control” by Karátson D., Thouret J.-C., Moriya I., Lomoschitz A. (1999). Bulletin of Volcanology, 63:289-290.

Riggs, N.R., Ort, M.H., White, J.D.L., Wilson, C.J.N., Clarkson, R. and Houghton, B.F., 2001, Post-1.8-ka marginal sedimentation in Lake Taupo, New Zealand: effects of wave energy

and sediment supply in a rapidly rising lake, in White, J.D.L. and Riggs, N.R., Volcaniclastic sedimentation in lacustrine settings, Blackwell Scientific Publ., Intl. Assoc. of Sedimentol. Spec. Publ. 30, p. 151-178.

White, J.D.L., Manville, V., Wilson, C.J.N., Houghton, B.F., Riggs, N., Ort, M., 2001, Settling and deposition of 181 A.D. Taupo pumice in lacustrine and associated environments, in White, J.D.L. and Riggs, N.R., Volcaniclastic sedimentation in lacustrine settings, Blackwell Scientific Publ., Intl. Assoc. of Sedimentol. Spec. Publ. 30, p. 141-150.

Ort, M.H., Rosi, M., and Anderson, C.D., 1999, Correlation of deposits and vent locations of the proximal Campanian Ignimbrite deposits, Campi Flegrei, Italy, based on NRM and AMS characteristics, Journal of Volcanology and Geothermal Research, v. 91, p. 167-178.

De Vita, S., Orsi, G., Civetta, L., Carandente, A., D'Antonio, M., Deino, A., di Cesare, T., Di Vito, M.A., Fisher, R.V., Isaia, R., Marotta, E., Necco, A., Ort, M., Pappalardo, L., Piochi, M., and Southon, J., 1999, The Agnano-Monte Spina eruption (4100 years BP) in the restless Campi Flegrei caldera (Italy); Journal of Volcanology and Geothermal Research, v. 91, p. 269-301.

Civetta, L., Orsi, G., Pappalardo, L., Fisher, R.V., Heiken, G., and Ort, M., 1997, Geochemical zoning, mingling, eruptive dynamics, and depositional processes - the Campanian Ignimbrite, Campi Flegrei caldera, Italy; Journal of Volcanology and Geothermal Resources, v. 75, p. 183-219.

Ort, M.H., Coira, B.L., and Mazzoni, M.M., 1996, Generation of a crust-mantle mixture: Magma sources and contamination at Cerro Panizos, central Andes; Contributions to Mineralogy and Petrology, v. 123, p. 308-322.

Ort, M.H., 1993, Eruptive processes and caldera formation in a nested downsag-collapse caldera: Cerro Panizos, central Andes Mountains; Journal of Volcanology and Geothermal Research, v. 56, p. 221-252.

Fisher, R.V., Orsi, G., Ort, M., and Heiken, G., 1993, Mobility of a large-volume pyroclastic flow - Emplacement of the Campanian Ignimbrite, Italy; Journal of Volcanology and Geothermal Research, v. 56, p. 205-220.

Gordon, A., and Ort, M.H., 1993, Edad y correlacion del plutonismo subcordillerano en las provincias de Rio Negro y Chubut (41o-42o30' L. S.); XII Congreso Geologico Argentino, Actas, Tomo IV, p. 120-127.

Ort, M.H., 1992, Orbicular volcanic rocks of Cerro Panizos: Their origin and implications for orb formation, Geological Society of America Bulletin; v. 104, p. 1048-1058.

Ort, M.H., and Mazzoni, M.M., 1992, Cerro Panizos Ignimbrites: Eruptive processes and emplacement; Cuarta Reunion Argentina de Sedimentologia, Actas, v. III, p. 65-72.

Ort, M.H., Coira, B., Mazzoni, M., Fisher, R.V., and Merodio, J.C., 1989, Centro emisor volcanico Cerro Panizos, Jujuy; Asociacion Geologica Argentina Revista, v. 44, p. 291-300.

BooksOrt, M.H., Porreca, M. & Geissman, J.W., in press, The use of palaeomagnetism and rock magnetism to

understand volcanic processes. Geological Society, London, Special Publications, 396.

Kelly, M., Ort, M., Tashiro, J.S., and Semken, S., 1999, VR Excursions: Exploring Earth’s Environment, v. 1.0, Prentice-Hall Publ., ISBN 0-13-096262-7.

Edited VolumeElson, M.D., and Ort, M.H., guest editors, 2003, In the shadow of the volcano: recent research at Sunset

Crater; Archaeology Southwest, volume 17, number 1 (winter 2003), 12 p.

Non-Peer-Reviewed Articles and Maps

White, J.D.L., Lefebvre, N.S., Ort, M., Kjarsgaard, B.A., Vazquez, J., Valentine, G., 2012, Field Trip Guide, Maar rims, crater deposits, diatremes and root zones; Hopi Buttes Field Workshop, Oct. 21 – 27, 2012, 78 p.

Elson, M.D., Ort, M.H., 2012, When did it happen? (Re)dating the eruption of Sunset Crater volcano, Archaeology Southwest, v. 26(2), p. 5-6.

Ort, M.H., 2012, Review: Eruptions that shook the world, by C. Oppenheimer; Environmental History, v. 17, p 666-667, doi: 10.1093/envhis/ems069

Elson, M.D., Ort, M.H., Anderson, K.C., 2011, Strontium (Sr) isotope analysis and provenance of construction wood at Wupatki Pueblo (NA 405), in northern Arizona, Desert Archaeology, Inc., Tech. Report 2011-01, 12 p.

Sayre, W.O., Ort, M.H., 2011, A geologic study of the Capulin Volcano National Monument and surrounding areas, Union and Colfax Counties, New Mexico, New Mexico Bureau of Geology and Mineral Resources Open-File Report 541, 81 p.

Elson, M.D., Street, D.J., Dean, J.S., Ort, M.H., 2009, A.D. 1064? A Pilot Study of Archaeological Tree-Ring Samples to Search for Visible Evidence of the Eruption of Sunset Crater Volcano, Northern Arizona, Desert Archaeology, Inc. Tech. Report 2009-03, 18 p.

Hooten, J.A., and Ort, M.H., 2007, Appendix B. Chronologic summary of Holocene volcanic centers in the western US and northern Sonora, Mexico, in Elson, M.D., [ed.], Sunset Crater archaeology: The history of a volcanic landscape. Environmental analyses, Anthropological Papers No. 33, Center for Desert Archaeology, Tucson, p. 141-145.

Hooten, J.A., and Ort, M.H., 2007, Appendix D. Tephra samples analyzed in the Sunset Crater area, in Elson, M.D., [ed.], Sunset Crater archaeology: The history of a volcanic landscape. Environmental analyses, Anthropological Papers No. 33, Center for Desert Archaeology, Tucson, p. 153-156.

Elson, M.D., Ort, M.H., 2006. The Little Springs volcanology and archaeology project, Grand Canyon–Parashant National Monument, Arizona. Investigators Final Report, Project No. 02-151. Desert Archaeology, Inc., Tucson. 16 p.

Elson, M.D., Sheppard, P.R., and Ort, M.H., 2005, Development of a dendrochemical method to date cinder cone volcanoes; Desert Archaeology, Inc. Technical Report No. 2005-10, 15 p.

Elson, M.D., and Ort, M.H., 2003, Collaborative research at Sunset Crater volcano; Archaeology Southwest, v. 17, p. 4-6.

Elson, M.D., and Ort, M.H., 2003, Parícutin volcano revisited; Archaeology Southwest, v. 17, p. 10.

Ort, M.H., 2003, Little Springs volcano: A new prehistoric eruption; Archaeology Southwest, v. 17, p. 11.

Ort, MH, Elson, MD, and Champion, DE, 2002, A paleomagnetic dating study of Sunset Crater Volcano; Desert Archaeology, Inc. Technical Report No. 2002-16, 16 p.

Ort, M.H., 2002, Review: Earthquakes and Eruptions [CD-ROM], EOS, Transactions, American Geophysical Union, v. 83, no. 29, p. 316.

Hooten, J.A., Ort M.H., and Elson M.D., 2001, Origin of Cinders in Wupatki National Monument; Technical Report No. 2001-12. Desert Archaeology, Inc., Tucson, 20 p.

Ort, M., Wohletz, K., Hooten, J. A., Neal, C. A. & McConnell, V., 2000,2The Ukinrek Maars Eruption, Alaska, 1977: A natural laboratory for the study of phreatomagmatic processes

at maars. Terra Nostra: Abstracts, International Maar Conference, Daun, Germany, p. 396-400.

Ort, M.H., 2000, Review: Vulcan’s Fury: Man against the volcano; Geographical Review 90(2): 297-98.

Ort, M.H., Dallegge, T.A., Vazquez, J.A., and White, J.D.L., 1998, Volcanism and sedimentation in the Mio-Pliocene Bidahochi Formation, Navajo Nation, northeastern Arizona; in Duebendorfer, E.M., Geologic excursions in northern and central Arizona, Geological Society of America, p. 35-57.

Wilson, C.J.N., Riggs, N.R., Ort, M.H., White, J.D.L., and Houghton, B.F., 1997, An annotated atlas of post-1.8 ka shoreline features at Lake Taupo, New Zealand; Institute of Geological and Nuclear Sciences Report 97/19, 35 p.

Symonds, R.B., Ritchie, B.E., McGimsey, R.G., Ort, M.H., Poreda, R.J., Evans, W.C., and Janik, C.J., 1997, Investigations of gas seeps and springs in the vicinity of the Gas Rocks, South Shore Becharof Lake, Alaska, US Geological Survey Open-File Report 97-127, 27 p.

Sayre, W.O., Ort, M.H., and Graham, D., 1995, Capulin Volcano is approximately 59,100 years old; Park Science, v. 15, no. 2, p. 10-11.

Fisher, R.V. , Orsi, G., and Ort, M., 1994, Excursion A3: Pyroclastic flow deposits illustrated by the Campanian Ignimbrite;in Carannante, G., and Tonielli, R., Pre Meeting Field trip Guidebook, 15th IAS Regional Meeting, Ischia, Italy, p. 61-82.

Spencer, J.E., Richard, S.M., and Ort, M.H., 1993, Geologic map of the western Eagletail Mountains, La Paz County, Arizona; Arizona Geological Survey Open-File Report 93-12, map scale 1:24,000, 11 p.

Ort, M.H., and Skotnicki, S., 1993, Geologic map of Saddle Mountain, Maricopa County, Arizona; Arizona Geological Survey Open-File Report 93-6, map scale 1:24,000, 11 p.

Fisher, R.V., Orsi, G., Civetta, L., Heiken, G., Ort, M., Somma, R., and Pappalardo, L., 1991, Campanian Ignimbrite, distal facies -- Emplacement mechanism of a large pyroclastic flow deposit; in Orsi, G., and Rosi, M., Large ignimbrite eruptions of the Phlegrean Fields Caldera: The Neapolitan Yellow Tuff and the Campanian Ignimbrite, Workshop on Explosive Volcanism, Napoli, Italy, p. 13-40.

Tabor, R.W., Booth, D.B., Vance, J.A., Ford, A.B., and Ort, M.H., 1988, Preliminary geologic map of the Sauk River 30 by 60 minute quadrangle, Washington; U.S. Geological Survey Open-File Map 88-692, 50p.

Ort, M.H., and Tabor, R. W., 1985, Major- and trace-element composition of greenstones, greenschists, amphibolites, and selected mica schists and gneisses from the North Cascades, Washington; U.S. Geological Survey Open-File Report 85-434, 13 p.

AbstractsAlfano, F., Pioli, L., Clarke, A., Ort, M. Roggensack, K., Self, S., 2014, Evidence of a complex

shallow reservoir network from micro-textural observations of the scoria products of the 1085 AD Sunset Crater eruption; Abstract, American Geophysical Union Fall Meeting, V21B-4748.

Anderson, K., Ort, M.H., Elson, M., Patrick, W.J., Homan, E.C., 2014, Cultural response to changing landscapes from the eruption of Sunset Crater in the late 11th century, northern Arizona, USA; GSA Abstracts with Programs Vol. 46, 185-12.

Ort, M.H., Cashman, K.V., Di Muro, A., Best, J.A., Rosi, M., Mothes, P.A., Bustillos, J., 2013, Conduit magma storage during the 800 Bp Quilotoa eruption, Ecuador, Abstract, American Geophysical Union Fall Meeting,V21B-2724.

Alfano, F., Pioli, L., Clarke, A.B., Ort, M.H., Roggensack, K., Self, S., 2013, Highly explosive mafic eruptions from the interplay between high viscosity and low viscosity magma: the Sunset Crater (AZ, USA) eruption; Abstract, American Geophysical Union Fall Meeting, V23C-2838.

Witter, M.R., Ort, M.H., Leudemann, L.A., 2013, Origin of the “dike-like” structure and transitions in eruptive styles at Colton Crater, northern Arizona: San Francisco Volcanic Field REU; Abstract, American Geophysical Union Fall Meeting, V41B-2791.

Leudemann, L., Ort, M.H., Witter, M., 2013, Transition from strombolian to phreatomagmatic activity due to scoria cone vent migration: Colton Crater, San Francisco Volcanic Field, Northern Arizona; Paper No. 129-5, Geological Society of America Abstracts with Programs. v. 45, No. 7, p.336.

Carrasco-Nunez, G., Ort, M.H., Davila-Harris, P., 2013, Variations in eruptive style of Mexican basaltic maar volcanoes; Abstract, Intl. Assoc. Volcanol. Chem. Ear. Interior 2013 Scientific Assembly, 1A2_3B-O14.

Neal, C., Larsen, J., Lu, Z., Ort, M., Schaefer, J., 2013, The 2008 eruption of Okmok volcano, Alaska: Ascent of magma into shallow intracaldera groundwater system and resulting ephemeral landforms; Abstract, Intl. Assoc. Volcanol. Chem. Ear. Interior 2013 Scientific Assembly, 3W_3C-P19.

Alfano, F., Pioli, L., Clarke, A.B., Ort, M.H., Roggensack, K., Self, S., 2013, Highly explosive basaltic eruptions: The case of Sunset Crater (AZ, USA); Abstract, Intl. Assoc. Volcanol. Chem. Ear. Interior 2013 Scientific Assembly, 1A2_3B-O12.

Giordano, G., Campagnola, S., Vinkler, A.P., Ort, M.H., Romano, C., Vona, A., De Benedetti, A.A., Cashman K.V., 2013, Inception of mafic, explosive caldera-forming eruptions: The basal fallout deposits of the Villa Senni (355 ka) and Pozzolane Nere (407 ka) eruptions at Colli Albani volcano (Italy); Abstract, Intl. Assoc. Volcanol. Chem. Ear. Interior 2013 Scientific Assembly, 3A2_3F-O10.

Carrasco, G., Ort, M.H., 2013, Eruptive and structural controls on the evolution of Mexican maar volcanoes: AGU Meeting of the Americas, Cancun Mexico, V43A-0314-17.

Elson, M.D., Ort, M.H., Anderson, K.C., 2013, A Tale of Two Volcanoes: Human Response to Eruptions in the Southwest U.S.; 77th Annual Meeting of the Society for American Archaeology, Honolulu.

Alfano, F., Clarke, A.B., Pioli, L., Ort, M.H., Self, S., 2012, Characterization of the 1000 AD Sunset Crater eruption and its pyroclastic products; Abstract, American Geophysical Union Fall Meeting, V53C-2851.

Todd, E., Ort, M.H., 2012, Variable sources and differentiation of lavas from the Copahue-Caviahue Eruptive Complex, Neuquen Argentina; Abstract, American Geophysical Union Fall Meeting, V11D-2804.

Beuttel, B.S., Vaughan, G.R., Ort, M.H., 2012, Measuring and monitoring volcanic crater lake temperature and heat flux using Spaceborne Thermal Infrared Remote Sensing; Abstract, American Geophysical Union Fall Meeting, V41A-2766.

Ort, M.H., Sheppard, P.R., Anderson, K.C., Elson M.D., 2012, Local environmental effects from deposition of basaltic tephra; Abstract, American Geophysical Union Fall Meeting, PP31A-2017.

Valentine, G.A., Ort, M.H., 2012, Basaltic volcanism in the American Southwest over the last million years: what happens here, how often, and why? Abstract, Volcanism in the American Southwest Meeting, Flagstaff, AZ.

Elson, M.D., Ort, M.H., 2012, Human Adaptation to Catastrophic Events: Lessons from the 11th Century CE Eruption of Sunset Crater Volcano; Abstract, Volcanism in the American Southwest Meeting, Flagstaff, AZ.

Alfano, F., Pioli, L., Clarke, A., Ort, M., Self , S., 2012, Characterization of the 1000 AD Sunset Crater eruption and its pyroclastic products; Abstract, Volcanism in the American Southwest Meeting, Flagstaff, AZ.

Elson, M.D., Ort, M.H., Anderson, K.C., 2012, Sunset Crater and Little Springs Volcano Eruptions: Hazards Management in the 11th Century A.D. Prehistoric Southwest; 13th Southwest Symposium, Albuquerque.

Ort, M.H., Newkirk, T., Vilas, J.F., Vazquez, J.A., 2011, Toward a facies model for AMS fabrics in pyroclastic currents; Abstract, Amer. Geophys. Union Fall Meeting, GP14A-05.

Iriarte, R., de Silva, S.L., Jimenez, N., Ort, M.H., 2011, The Cerro Guacha Caldera complex: An upper Miocene-Pliocene polycyclic volcano-tectonic structure in the Altiplano-Puna Volcanic Complex of the central Andes of Bolivia; Abstract, Amer. Geophys. Union Fall Meeting, V21C-2510.

Kaiser, J.F., de Silva, S.L., Ort, M.H., Sunagua, M., 2011, The Pastos Grandes Caldera Complex of SW Bolivia: The building of a composite upper crustal batholith; Abstract, Amer. Geophys. Union Fall Meeting, V21C-2509.

Schroeder, T., Riggs, N.R., Ort, M.H., Tinnin, B., 2011, Nature of the mid-Tertiary lower crust in the Transition Zone of Arizona as suggested by xenoliths and their host lava: UHP metamorphism followed by retrogression and melt interaction; Abstract, Geological Society of America Annual meeting, 103-1.

Rittenour, T.M., Riggs, N.R., Hamlin, L., Ort, M., 2011. Application of single-grain quartz-SAR to date xenocrysts within a basalt flow from a cinder cone, northern Arizona, USA, 13th International Conference on Luminescence and Electron Spin Resonance Dating, 10-14 July 2011, Torun, Poland, Book of Abstracts p 170.

Elson, M.D., Ort, M.H., Sheppard, P.R., Samples, T.L., Anderson, K.C., and May, E.M., 2011,   A.D. 1064 No More? A Multidisciplinary Re-evaluation of the Date of the Eruption of Sunset Crater Volcano, Northern Arizona, Extended Abstract, 76th Annual Meeting, Society for American Archaeology, Sacramento, California.

Schroeder, T.J., Riggs, N., Ort, M.H., 2010, Retrograded eclogite xenoliths from mid-Tertiary potassic lavas along the southwest margin of the Colorado Plateau; Abstract, Amer. Geophys. Union Fall Meeting, T21E-2208.

Best, J.A., Bustillos, J., Ort, M.H.,Cashman, K.V., Mothes, P.A., Di Muro, A., Rosi, M., 2010, Vent Processes and Deposits of a Hiatus in a Violent Eruption: Quilotoa Volcano, Ecuador; Abstract, Amer. Geophys. Union Fall Meeting, V11D-2321.

Ort, M.H., Neal, C.A., Larsen, J.F., Unema, J.A., Beget, J.E., Schaefer, J.R., 2010, Near-Vent Processes during the 2008 Okmok Eruption, Umnak Island, Alaska;Abstract, Amer. Geophys. Union Fall Meeting, V23B-2427.

Unema, J.A., Ort, M.H., Larsen, J.F., Neal, C.A., Schaefer, J.R., Webley, P., 2010, Ash Deposition Mechanisms and Plume Scrubbing in the 2008 Okmok Eruption, Umnak Island, Alaska; Abstract, Amer. Geophys. Union Fall Meeting, V13A-2346.

Zelawski, M., Ort, M.H., 2010, Maar margins in the Hopi Buttes volcanic field, Navajo Nation, Arizona: Field mapping yields interpretation of maar volcano proximal facies; Abstract, Geological Society of America Annual meeting, 92-8.

Iriarte, R., de Silva, S., Jimenez, N., Salisbury, M., Ort, M., Singer, B., and Jicha, B., 2010, La Caldera Guacha (5.6 Ma al presente) – Un complejo sistema supervolcanico en el sudoeste de los Lipez, Bolivia, Congreso Geológico Boliviano.

Ort, M.H, Cashman, K.V., Best, J.A., Mothes, P.A., Bustillos, J., Di Muro, A., Rosi, M., Ruscitto, D.M., Hall, M.L., 2009, A Weeks-Long Hiatus During the Quilotoa 800 BP VEI 6 Eruption; Abstract, Amer. Geophys. Union Fall Meeting, V23C-2073.

Best, J.A., Bustillos, J., Ort, M.H., Cashman, K.V., Mothes, P.A., Di Muro, A., Rosi, M., 2009, Vent processes and deposits of a hiatus in a violent eruption: Quilotoa volcano, Ecuador; Abstract, Amer. Geophys. Union Fall Meeting, V11B-1947.

Vinkler, A.P., Ort, M.H., Giordano, G., 2009, The basal fallout and surge deposits of the mafic ignimbrite-forming Villa Senni Eruption Unit, (Colli Albani volcano, Italy); Abstract, Amer. Geophys. Union Fall Meeting, V23C-2074.

Ort, M.H., de Silva, S., Jimenez, N., Salisbury, M., Jicha, B.R., Singer, B.S., 2009, Two new supereruptions in the Altiplano-Puna volcanic complex of the central Andes, Abstract, Geological Society of America Annual Meeting, 41-7.

Schroeder, T., Riggs, N., Ort, M.H., Tinnin, B., Xenolith evidence for isothermal decompression in the central Arizona lower crust prior to mid-Tertiary detachment faulting, Abstract, Geological Society of America Annual Meeting, 40-4.

Carrasco-Núñez, G., Ort, M., Austin, A., Cano, M., Dávila, P., Puente, I., Rincón, N., Romero, C., 2009, Contrasting eruptive behavior in the evolution of xalapaxco (maar) volcanoes in central México, Third International Maar Conference Conference, Malargüe, Argentina, Abstract 11.

Ort, M., Austin, A., Carrasco-Núñez, G., Zimanowski, B., Büttner, R., Dellino, P., 2009, Phreatomagmatic eruptions of rhyolitic magma 2: Tepexitl maar as a case history, Third International Maar Conference Conference, Malargüe, Argentina, Abstract 89.

Zimanowski, B., Austin-Erickson, A., Büttner, R., Dellino, P., Ort M., 2009, Phreatomagmatic eruptions of rhyolitic magma 1: Experiments and physical models, Third International Maar Conference Conference, Malargüe, Argentina, Abstract 138.

Ort, M.H., de Silva, S.L., Jiménez, N., 2008, Identification of the Calderas for Major Ignimbrites of the Altiplano-Puna Volcanic Complex, Central Andes, Including Two New Super-eruptions, Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract V21C-2114.

Salisbury, M., de Silva, S.L., Jicha, B., Singer, B., Jiménez, N., Ort, M., New 40Ar/39Ar Ages From Southwest Bolivia Refine the Timing of APVC Volcanism, Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract V21C-2117.

Ort, M.H., De Silva, S.K., Jiménez, N.H., 2008, Anisotropy of magnetic susceptibility identifies the source of two Pliocene super-eruptions in the Altiplano-Puna Volcanic Complex, Central Andes, IAVCEI General Assembly, Iceland, Session 2-i P10.

De Silva, S.K., Salisbury, M., Jimenez, N., Ort, M.H., Singer, B., Jicha, B., 2008, Supervolcano flare-up and caldera formation in the Central Andes, IAVCEI General Assembly, Iceland, Session 2i.

Sheppard, P.R., Elson, M.D., Ort, M.H., Anderson, K.C., May, E.M., Kent A. 2008. Dating prehistoric volcanoes: dendrochemical testing of the 11th century AD date of the eruption of Sunset Crater, Arizona. 1st AmeriDendro Conference, June 23-27, 2008, Vancouver, British Columbia, Canada.

Elson, M.D., Ort, M.H., Anderson, K.C., and Sheppard, P.R., 2007, Human Adaptation to Volcano Eruptions: A Tale of Two Volcanoes in the Prehistoric American Southwest, Abstracts, Society for American Archaeology Annual Meeting, p.

Ort, M.H., Carrasco-Nuñez, G., 2006, Lateral and Vertical Vent Migration at Tecuitlapa Maar, Mexico, Eos Trans. American Geophysical Union, 87(52), Fall Meeting Supplement, Abstract V43B-1811.

Sheppard, P.R., Ort, M., Anderson, K., Speakman, J., Elson. M. 2006. Dendrochemical analysis of trees affected by cinder cone eruptions: a new technique for re-analyzing the Sunset Crater eruption. Poster paper and abstract, 7th International Conference on Dendrochronology, Beijing, China, June 11-17, 2006.

Sheppard, P.R., May, E.M., Ort, M.H., Anderson, K.C., Elson. M.D. 2006. Dendrochronological responses to the 24 October 1992 tornado at Sunset Crater, northern Arizona. Poster paper and abstract, 7th International Conference on Dendrochronology, Beijing, China, June 11-17, 2006.

Ort, M.H., Elson, M.D., Anderson, K.C., and Duffield, W.A., 2006, Effects of cinder-cone eruptions on human populations in southwestern North America, Abstracts, Fourth Cities on Volcanoes Conference, Quito, Ecuador, p. 175.

Austin, A., Ort, M.H., 2006, Repetitive phreatomagmatic explosions of a growing dome: A case study of rhyolitic Tepexitl maar, Abstracts, Fourth Cities on Volcanoes Conference, Quito, Ecuador, p. 49.

Pandamouz, A., Ort, M.H., Breit, G.N., Hiza, M., Parnell, R.A., 2005, Aqueous geochemistry of the Pueblo Colorado Wash Aquifer, Eos Trans. American Geophysical Union, 85(47), Fall Meeting Supplement, Abstract H31B-1315.

Newkirk, T.T., Ort, M.H., 2005, Anisotropy of magnetic susceptibility (AMS) and sedimentary fabric studies of phreatomagmatic surge deposits, Hopi Buttes, Navajo Nation, NE Arizona, Eos Trans. American Geophysical Union, 85(47), Fall Meeting Supplement, Abstract GP13A-0048.

Sheppard, P. R., Ort, M.H., Anderson, K. A., Speakman, J., and Elson, M. D., 2005, Dendrochemical Analysis of Trees Affected by Cinder Cone Eruptions: A New Technique for Re-analyzing the Sunset Crater Erution. Abstracts, 80th Annual Meeting, Southwestern and Rocky Mountain Division, American Association for the Advancement of Science, Tucson, Arizona. Paper 46-7.

Ort, M.H., and Elson, M.D., 2005, Human adaptation to cinder cone volcano eruptions in southwestern North America; Abstracts, Society for American Archaeology Annual Meeting, p. 222.

Ort, M.H., Sheppard, P.R., Speakman, J., Anderson, K.A.,Elson, M.D., Siebe G., C., 2004, Dendrochemical dating of tephra layers; Eos Trans. American Geophysical Union, 85(47), Fall Meeting Supplement, Abstract V21C-05.

Todd, E., and Ort, M., 2004, Geochemical evolution of pre-caldera magmas at Caviahue Caldera, Neuquen province, Argentina, Eos Trans. American Geophysical Union, 85(47), Fall Meeting Supplement, Abstract V13B-1470.

Bonamici, C.E., Kaufman, D.E., and Ort, M.H., 2004, Origin of the Walker Lake cinder layer and its implications for dating the Saddle Mountain eruption, San Francisco volcanic field, northern Arizona, Geol. Soc. America Cordilleran/Rocky Mtn. Section meeting, Paper No. 41-7.

Ort, M.H., and Carrasco-Núñez, G., 2004, Vent alignments at maar volcanoes; Occasional Papers of the Geological Institute of Hungary, v. 203, Abstract Volume, Second Intl. Maar Conference, p. 82.

Carrasco-Núñez, G., Ort, M., Dávila, P., Puente, R., and Ortega-Guerrero, A., 2004, Evolution of maar volcanoes in central Mexico; Occasional Papers of the Geological Institute of Hungary, v. 203, Abstract Volume, Second Intl. Maar Conference, p. 48.

Newkirk, T.T., and Ort, M.H., 2004, Anisotropy of magnetic susceptibility and sedimentary fabric studies of phreatomagmatic surge deposits, Hopi Buttes, Navajo Nation, NE Arizona; Occasional Papers of the Geological Institute of Hungary, v. 203, Abstract Volume, Second Intl. Maar Conference, p. 80-81.

Sheppard, P. R., Elson, M. D., Ort, M. H., Speakman, J., and Anderson, K. A., 2004, Dendrochemical Analysis of Trees Affected by Cinder Cone Eruptions: A New Technique for Analyzing the Sunset Crater Eruption. Abstracts, Inaugural Symposium of the Archaeological Sciences of the Americas, Tucson, Arizona.

Ort, M.H., and Carrasco-Nuñez, G., 2004, Tecuitlapa – Evolution of fuel-coolant interactions at a young maar, Neogene-Quaternary continental margin volcanism – Proceedings of GSA Penrose Conference, Metepec, Puebla, Mexico, p. 58.

Ort, M.H., Elson, M.D., Anderson, K.C., and Duffield, W.A., 2003, Effects of Cinder-Cone Eruptions on Human Populations in Southwestern North America, Abstracts, Geol. Soc. Amer. Annual Meeting, Seattle, paper no. 91-11.

Anderson, D.E., Ort, M.H., and Ostergren, D.A., 2003, An interdisciplinary San Juan River field experience for undergraduates through Northern Arizona University's Center for Environmental Sciences and Education, Abstracts, Geol. Soc. Amer. Annual Meeting, Seattle, paper no. 46-28.

Elson, M.D., Ort, M.H., 2003, The Impact of Sunset Crater Volcano on Local Northern Arizona Populations, ca. A.D. 1100, World Archaeology Congress, Washington, D.C., p. 334.

Pioli, L., Ort, M., Lanza, R., Rosi, M., 2003, Magnetic fabric and welding processes in high-grade tuffs. European Geophysical Union, Nice, France, p.

Macy, J., Umhoefer, P.J., Ort, M., 2003, Moderate clockwise rotation of Carmen Island during opening of the Gulf of California. Geological Society of America Cordilleran Section, paper 5-4.

Depetris, P.D., Ort, M., 2002, Sediment-water interaction in the Copahue volcano-Caviahue Lake-Agrio River system, Neuquén, Argentina. IX Reunión Argentina de Sedimentología, p. 86.

Ort, M.H., and Elson, M.D., 2002, Effects of cinder cone eruptions on nearby populations, Chacmool Conference, University of Calgary, November 13-17, no page numbers.

Elson, M.D., and Ort, M.H., 2002, Effects of the c.a. A.D. 1100 Sunset Crater eruption on local populations, northern Arizona, Chacmool Conference, University of Calgary, November 13-17, no page numbers.

Elson, M.D., Ort M.H., Heidke J.M., 2002, Rethinking Cultural Boundaries Along the Sinagua-Cohonina Frontier, Northern Arizona. Abstracts, 67th Annual Meeting of the Society for American Archaeology, Denver, p. 98.

Ort, M.H. Elson, M.D., Hooten, J.A., Duffield, W.A., Champion, D.E., 2001, Interaction Between Humans and The Sunset Crater Eruption, Northern Arizona; Abstracts, Geol. Soc. Amer. Annual Meeting, Boston, p. A294.

Hooten, J.A., and Ort, M.H., 2000, Explosive dynamics and related physical features of phreatomagmatic diatremes, Hopi Buttes, Arizona, USA; Colima Volcano, Seventh Annual Meeting, Abstracts, Universidad de Colima, p. 72.

Hooten, J.A., and Ort, M.H., 1999, Explosive dynamics and related physical features of phreatomagmatic diatremes, Hopi Buttes, Arizona, USA; Abstracts with Programs, Geological Society of America Annual Meeting, Denver, CO, p. A207.

Cunningham, H., Ort, M.H., and Riggs, N.R., 1999, Geochemical trends in the Sullivan Buttes Latite, Chino Valley, Arizona; Abstracts with programs, Geological Society of America Annual Meeting, Denver, CO, p. A164.

Elson, M.D., and Ort, M.H., 1999, A Prehistoric Volcano Offering from the American Southwest, Abstracts, 64th Annual Meeting of the Society for American Archaeology, Chicago, p. 101.

Ort, M.H., and Vazquez, J.A., 1998, A comparison of eruption processes at Ukinrek Maars and Hopi Buttes, USA, Abstracts, International Volcanological Congress, Cape Town, South Africa, p. 45.

Szakacs, A., and Ort, M.H., 1998, Defining and naming sector collapse-related volcanic depressions, Abstracts, International Volcanological Congress, Cape Town, South Africa, p. 60.

Vazquez, J.A., and Ort, M.H., 1998, Initial explosivity of lamprophyric magmas from maar-diatremes in the Hopi Buttes, USA, Abstracts, International Volcanological Congress, Cape Town, South Africa, p. 65.

Vazquez, J.A., and Ort, M.H., 1998, Characteristics and facies analysis of base surge deposits from the Hopi Buttes Volcanic Field: Implications for surge dynamics, Abstracts with Programs, Rocky Mountain Section, Geological Society of America, p. 39.

Dallegge, T.A., Ort, M.H., and McIntosh, W.C., 1998, Correlation and chronology of the lower units of the Mio-Pliocene Bidahochi Formation, Navajo and Hopi Nations, Northeastern Arizona, Abstracts with Programs, Rocky Mountain Section, Geological Society of America, p. 7.

Kelly, M., Semken, S., Ort, M., Tashiro, J., 1998, Advanced simulations for geology and environmental sciences courses, Abstracts, Spring Meeting, American Geophysical Union, p. S13.

Ort, M.H., Riggs, N.R., and Wilson, C.J.N., 1997, Characteristics of pumice-rich intra-caldera sedimentation following the 181 AD eruption of Taupo Caldera, North Island, New Zealand; Geol. Soc. America Abstracts with Programs, p. A-114.

Kelly, M.M., Ort, M.H., and Tashiro, J., 1997, Rethinking designs for geology and environmental sciences courses serving preservice teachers; Geol. Soc. America Abstracts with Programs, p. A-301.

Duffield, W., Ort, M., Warburton, M., and Semken, S., 1997, Opportunities for multidisciplinary research in the Hopi Buttes area of the Colorado Plateau, Fourth Biennial Conference of Research on the Colorado Plateau, Sept. 16-18, 1997, Program and Abstracts, p. 37.

Ort, M.H., and Rosi, M., 1997, Paleomagnetic studies of Campi Flegrei: Vent locations and correlation of proximal and distal campanian ignimbrite eruption deposits; IAVCEI General Assembly, Puerto Vallarta, Mexico, p. 153.

Heiken, G., Ort, M., Duffield, W., A. McEwen, 1997, Xela Caldera, Guatemala; IAVCEI General Assembly, Puerto Vallarta, Mexico, p. 26.

Riggs, N.R., Ort, M.H., Houghton, B., Wilson, C.J.N., and White, J.D.L., 1997, Facies associations of the post-1800-yr Taupo Caldera shoreline; Abstracts, IAVCEI General Assembly, Puerto Vallarta, Mexico, p. 23.

Civetta L., de Vita S., Di Vito M., Fisher R.V., Isaia R., Orsi G., Ort M., 1997, The Agnano Monte Spina eruption in the resurgent, nested Campi Flegrei caldera (Italy); IAVCEI General Assembly, Puerto Vallarta, Mexico, p. 148.

Agenbroad, L.D., Brunelle, A., Ort, M., 1996, The Mammoth Summit Glacier, Iron County, Utah; Abstracts, AMQUA 14th biennial meeting, p. 146.

Ort, M.H., Wohletz, K.H., Neal, C.A., McConnell, V.S., 1995, Mechanics of Magma/Water Interaction, Ukinrek Maars, Alaska; Abstracts, Intl. Union Geophys. Geod., XXI General Assembly, p. A467.

Ort, M.H., Wohletz, K.H., and Neal, C.A., 1994, Complex interactions of ground water and basaltic magma during the eruption of the Ukinrek Maars, Alaska; Geol. Soc. America Abs. with Prog., p. A-378.

Civetta, L., Orsi, G., Pappalardo, L., Ort, M., Heiken, G., Fisher, R.V., 1994, Composition and emplacement of the Campanian ignimbrite, Italy; Abstracts, International Volcanological Congress, Ankara, Turkey; no page number.

Civetta, L., Orsi, G., Pappalardo, L., Ort, M., Heiken, G., Fisher, R.V., 1994, Composition and emplacement of the Campanian ignimbrite, Italy; Abstracts, International Mineralogical Association, 16th general meeting, p. 78.

Ort, M., 1994, Caldera structures and how they form; Abstracts volume, Mineralogy Department Centenary, University of Bucharest, p. 23.

Ort, M.H., Neal, C.A., McConnell, V.S., Wohletz, K.H., Duffield, W.A., and Lescinsky, D.T., 1993, Effects of prevailing wind on the distribution of surge and fallout deposits at Ukinrek Maars, Alaska; Abstracts, 1993 Fall Meeting, American Geophysical Union, p. 639.

Ort, M.H., Fisher, R.V., and Orsi, G., 1993, AMS evidence for complex interactions between topography and pyroclastic flows: Campanian Ignimbrite, Italy; Abstracts, IAVCEI, Canberra, Australia, p. 83.

Riggs, N.R., Ort, M.H., and Ward, S.A., 1993, Volcanic and fluvial interaction adjacent to a small-volume dome field, central Arizona, U.S.A.; Abstracts, IAVCEI, Canberra, Australia, p. 90.

Ort, M.H., and Wise, W.S., 1991, Lower crustal granulite and middle crustal components in dacites from San Francisco volcanic field; Eos, Transactions, American Geophysical Union, p. 561.

Ort, M.H., 1990, Orbs in the crystal-rich dacitic Cerro Panizos Ignimbrite: Their origin and significance; Abstracts from International Volcanological Congress, Mainz, FRG, no page number.

Ort, M.H., B.L. Coira, and M.M. Mazzoni, 1989, Eruptive behavior, vent locations, and caldera development of Cerro Panizos, Central Andes; IAVCEI Abstracts with Programs, Santa Fe, New Mexico, p. 208.

Ort, M.H., J.M. Mattinson, and R.V. Fisher, 1988, Trace element and Sr, Nd, and Pb isotopic variations with stratigraphy in Miocene ignimbrites and lava flows of Cerro Panizos, Argentina and Bolivia; Geol. Soc. America Abstracts with Programs, v. 20, p. A10.

Ort, M., Coira, B., Mazzoni, M., Fisher, R.V., and Mattinson, J.M., 1987, Volcanismo ignimbritico del Cerro Panizos, Jujuy, Argentina; Actas del Decimo Congreso Geologico Argentino, p.335-337.

Robinson, J.V., Cameron, K.L., and Ort, M.H., 1987, Orthogneiss xenoliths from central Chihuahua, Mexico: Restite or cumulate?; Geol. Soc. America Abstracts with Programs, v. 19, p. 822-823.