• Geophysics: Solid Earth and Exploration
• Rock and Paleomagnetism
• Stratigraphy
• Oceanography - Marine Geology
• Geoarchaeology
• Geology of National Parks

Relatively new applications in stratigraphy allow regional and global correlation using paleoclimate proxies. Tied to biostratigraphic and geochemical data sets, magnetostratigraphy susceptibility can be used for high-resolution correlation and interpretation of marine sedimentary sequences from around the world. Published and active research includes samples throughout the Phanerozoic from a number of sites from North America, Europe, Africa and Asia. 

• Ph.D., 1977, University of Rhode Island, Graduate School of Oceanography
• M.S., 1974, University of Rhode Island, Graduate School of Oceanography
• B.S., 1970, Florida State University, Department of Geology

2009
Ellwood, B.B., Tomkin, J.H., El Hassani, A., Bultynck, P., Brett, C.E., Schindler, E., Feist, R., Bartholomew, A., 2009. A climate-driven model and development of a floating point time scale for the entire Middle Devonian Givetian Stage: A test using magnetostratigraphic susceptibility as a climate proxy. Palaeogeography, Palaeoclimatology, Palaeoecology, in press.

Ellwood, B.B., Kafafy, A., Kassab, A., Abdeldayem, A., Obaidalla, N., Howe, R.W., Sikora, P., 2009. Magnetostratigraphy Susceptibility Used for High Resolution Correlation among Santonian (Upper Cretaceous) Marine Sedimentary Sequences in the U.S. Western Interior Seaway and the Western Sinai Peninsula, Egypt. In Modern Stratigraphic techniques: Theories and Case Histories, eds. Ratcliffe, K. and B. Zaitlin, SEPM Special Publication, in press.

Ellwood, B.B., Kafafy, A., Kassab, A., Tomkin, J.H., Abdeldayem, A., Obaidalla, N., Willson, K., Thompson, D.E., 2009. Magnetostratigraphy Susceptibility Used for High Resolution Correlation Among Paleocene/Eocene Boundary Sequences in Egypt, Spain and the U.S.A. In Modern Stratigraphic techniques: Theories and Case Histories, eds. Ratcliffe, K. and B. Zaitlin, SEPM Special Publication, in press.

2008
Ellwood, B.B., Tomkin, J.H.,  Febo, L.A., Stuart, C.N., Jr., 2008. Time Series Analysis of Magnetic Susceptibility Variations in Deep Marine Sediments: A Test Using Upper Danian-Lower Selandian Proposed GSSP, Spain. Palaeogeography, Palaeoclimatology, Palaeoecology 261, 270-279.

Ellwood, B.B., Tomkin, J.H., Ratcliffe, K.T., Wright, M., Kafafy, A.M., 2008. High Resolution Magnetic Susceptibility and Geochemistry for the Cenomanian/Turonian Boundary GSSP with Correlation to Time Equivalent Core. Palaeogeography, Palaeoclimatology, Palaeoecology, 261, 105-126.

Lan, L.T.P., Ellwood, B.B., Tomkin, J.H., Truong, D.N., 2008. Magnetic susceptibility study on the Permian/Triassic boundary in Lung Cam Limestone at Ha Giang Province, Viet Nam. Journal of Geology, Series B (English), No. 31-32, 285-298.

2007
Ellwood, B.B., Brett, C.E., MacDonald, W.D., 2007. Magnetosusceptibility Stratigraphy of the Upper Ordovician Kope Formation, Northern Kentucky. Palaeogeography, Palaeoclimatology, Palaeoecology 243, 42-54.

Ellwood, B.B., Tomkin, J., Richards, B., Benoist, S.L., and Lambert, L.L., 2007. MSEC Data Sets Record Glacially Driven Cyclicity: Examples from the Arrow Canyon Mississippian-Pennsylvanian GSSP and Associated Sections, Palaeogeography, Palaeoclimatology, Palaeoecology 255, 377-390. doi: 10.1016/j.palaeo.2007.08.006.

Ellwood, B.B., Fillon, R.H., Waterman, A.S., Kassab, A., 2007. High Resolution Correlations: Projecting Global Data Sets into Gulf Coast Sedimentary Sequences Using Biostratigraphy and Magnetic Susceptibility. In 27th Annual GCSSEPM Foundation Bob F. Perkins Research Conference, The Paleogene of the Gulf of Mexico and Caribbean Basins: Processes, Events, and Petroleum Systems, Ed. L. Kennan, J. Pindell, and N.C. Rosen, pp. 232-269.

Lehrmann, D.J., Pei, D., Enos, P., Minzoni, M., Ellwood, B.B., Orchard, M.J., Zhang, J., Wei, J., Dillett, P., Koenig, J., Steffen, K., Druke, D., Gross, J., Kessel, B., Newkirk, T., 2007. Impact of differential tectonic subsidence on isolated carbonate platform evolution: Triassic of the Nanpanjiang basin, south China. AAPG Bulletin, 91, 287-320.

Ellwood, B.B., 2007. Low-Field magnetic susceptibility (MS) of sediments and sedimentary rocks: A general overview of active research areas. Encyclopedia of Geomagnetism and Paleomagnetism, Springer, pp. 566-572.

Thacker, P.T., Ellwood, B.B., 2007. Late Pleistocene paleoclimate and sediment magnetic susceptibility at Lapa dos Coelhos, Portugal. From the Mediterranean basin to the Portuguese Atlantic shore: Papers in Honor of Anthony Marks, Actas do IV Congresso de Arqueologia Peninsular, Ed. Nuno Ferreira Bicho, p.163-171.

Algeo, T.J., Hannigan, R., Rowe, H., Brookfield, M., Baud, A., Krystyn, L., Ellwood, B.B., 2007. Sequencing events across the Permian-Triassic boundary, Guryul Ravine (Kashmir, India). Palaeogeography, Palaeoclimatology, Palaeoecology 252, 328-346.

Algeo, T.J., Ellwood, B.B., Thoa, N.T.K., Rowe, H., Maynard, J.B., 2007. The Permo-Triassic boundary at Nhi Tao, Vietnam: Evidence for recurrent influx of sulfidic watermasses to a shallow-marine carbonate platform. Palaeogeography, Palaeoclimatology, Palaeoecology 252, 304-327.

Lehrmann, D.J., Jonathan L. Payne, J.L., Pei, D., Enos, P., Druke, D., Steffen, K., Zhang, J., Wei, J., Orchard, M.J., Ellwood, B., 2007. Record of the End Permian extinction and Triassic biotic recovery in the Chongzuo-Pinnguo Platform, southern Nanpanjiang Basin, Guangxi, south China. Palaeogeography, Palaeoclimatology, Palaeoecology 252, 200-217.

Luu Thi Phuong Lan, Ellwood B. B., Ta Hoa Phuong,2007. Xac dinh ranh gioi F/F tren cac he tang da voi tai Xom Nha, Quang Binh bang phuong phap MSEC, Tap chi CKHVTD, Tap 29 (1), 30-37. English translation: Placement of the Frasnian-Famenian extinction event and boundary within the Xomnha section, middle Vietnam, using new biostratigraphic (conodont) and Magnetostratigraphic (susceptibility) data. Journal of Earth Sciences 29, 30-37 (in Vietnamese with English abstract).

2006
Ellwood, B.B., Gose, W.L., 2006. Heinrich H1 and 8,200 Year B.P. Climate Events Recorded in Hall’s Cave, Texas. Geology 34, 753-756.

Owsley, D.W., Ellwood, B.B., Melton, T., 2006. Search for the grave of William Preston Longley, hanged Texas Gunfighter. Historical Archaeology 40, 50-63.

Ellwood, B.B., García-Alcalde, J.L., El Hassani, A., Hladil, J., Soto, F.M., Truyóls-Massoni, M., Weddige, K., Koptikova, L., 2006. Stratigraphy of the Middle Devonian Boundary: Formal Definition of the Susceptibility Magnetostratotype in Germany with comparisons to Sections in the Czech Republic, Morocco and Spain. Tectonophysics 418, 31-49.

Brook, G.A., Ellwood, B.B., Railsback, L.B., Cowart, J.B., 2006. A 164 ka Record of Environmental Change in the American Southwest from a Carlsbad Cavern Speleothem. Palaeogeography, Palaeoclimatology, Palaeoecology 237, 483-507.

Ellwood, B.B., Balsam, W.L., Roberts, H.H., 2006. Gulf of Mexico Sediment Sources and Sediment Transport Trends from Magnetic Susceptibility Measurements of Surface Samples. Marine Geology 230, 237-248.

Schmitz, B., Ellwood, B.B., Peucker-Ehrenbrink, B., El Hassani, A., Bultynck, P., 2006. Platinum group elements and 187Os/188Os in a purported impact ejecta layer near Eifelian-Givetian stage boundary, Middle Devonian. Earth and Planetary Science Letters 249, 162-172.

2005
Balsam, W., Ellwood, B.B., Ji, J., 2005, Direct correlation of the marine oxygen isotope record with Loess Plateau iron oxide and magnetic susceptibility records. Palaeogeography, Palaeoclimatology, Palaeoecology 221, 141-152.

Baena, J., Carrión, E., Ruiz, B., Ellwood, B., Sesé, C., Yravedra, J., Jordá, J., Uzquiano, P., Velázquez, R., Manzano, I., Sánchez-Marco, A., Hernámdez, F., 2005. Paleoecología y comportamiento humano durante el Pleistoceno Superior en la comarca de Liébana: La secuencia de la Cueva de El Esquilleu (Occidente de Cantabria, España), Museo de Altamira. MONOGRAFÍAS nº 20: 461-487 (in Spanish with English abstract).

2004
Ellwood, B.B., Benoist, S.L., El Hassani, A., Wheeler, C., Crick, R.E., 2004. Response to Comment on "Impact Ejecta Layer from the Mid-Devonian: Possible Connection to Global Mass Extinctions." Science 303, Technical Comment: 471; 471c: 1-2.

Thoa, N.T. K, Huyen, D.T., Ellwood, B.B., Lan, L.T.P., Truong, D.N., 2004,  Determination of Permian - Triassic boundary in limestone formations from Northeast of Vietnam by paleontological and MSEC methods. Journal of Sciences of the Earth 26, 222-232 (in Vietnamese with an English abstract).

Ellwood, B.B., Harrold, F.B., Benoist, S.L., Thacker, P., Otte, M., Bonjean, D., Long, G.L., Shahin, A.M., Hermann, R.P., Grandjean, F., 2004, Magnetic Susceptibility Applied as an Age-Depth-Climate Relative Dating Technique Using Sediments from Scladina Cave, a Late Pleistocene Cave Site in Belgium. J. archaeological Science 31, 283-293.

Harrold, F., Ellwood, B., P. Thacker, P., Benoist, S., 2004. Magnetic susceptibility analysis of sediments at the Middle-Upper Paleolithic transition for two cave sites in northern Spain. ZILHÃO, J.; D'ERRICO, F. (eds.) The Chronology of the Aurignacian and of the Transitional Technocomplexes. Dating, Stratigraphies, Cultural Implications, Trabalhos de Arqueologia 33. Lisboa, Instituto Português de Arqueologia, 301-310.

2003
Ellwood, B.B., Benoist, S.L., El Hassani, A., Wheeler, C., Crick, R.E., 2003. Impact Ejecta Layer from the Mid-Devonian: Possible Connection to Global Mass Extinctions. Science 300, 1734-1737.

Ellwood, B.B., MacDonald, W.D., Wheeler, C., Benoist, S.L., 2003. The K-T Boundary in Oman: Identified Using Magnetic Susceptibility Field Measurements with Geochemical Confirmation. Earth Planetary Science Letters 206, 529-540.

Graduate Students

Rebecca Tedford, Ph.D. Candidate

Robey H. Clark Profile