Brooks Ellwood 

Emeritus Professor

Robey Clark Distinguished Professor in Geology, LSU

Fellow - Geological Society of America (GSA)

Fellow – American Association for the Advancement of Science (AAAS)

Bachelor's Degree(s): Florida State University, 1970

Master's Degree: University of Rhode Island, Graduate School of Oceanography 1974

PhD: University of Rhode Island, Graduate School of Oceanography, 1977

Phone: (225) 578-3416

Lab Phone: (225) 578-4399

Fax: (225) 578-2302


Link to CV

Google Scholar Page:

Office: 343 Howe-Russell Building

Area of Interest

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.

Selected Publications (full list of publications here)

Brooks B. Ellwood Refereed Publications (Journals and Book Chapters) Post 2006 (10 years):

Wardlaw, B.R., Nestell, M.K., Nestell, G.P., Ellwood, B.B., Lan, T.P., 2015. Conodont biostratigraphy of the PermianTriassic boundary sequence at Lung Cam, Vietnam, Micropaleontology, 61, 313-334.

W.-Q. Xue, B. Li, J.-X. Yan, B.B. Ellwood, J.H. Tomkin, Y. Wang, Z.-M. Zhu, 2015 High-resolution floating point time scale (FPTS) of Permian Capitanian Stage in South China: Chinese Journal of Geophysics (Chinese), v. 58, 3719-3734; doi:10.6038/cjg20151023; (English), v. 58, 611627.

Ellwood, B.B., El Hassani, A., Tomkin, J.H., and Bultynck, P., 2015. A climate-driven model using time-series analysis of magnetic susceptibility () datasets to represent a floating-point high-resolution geological timescale for the Middle Devonian Eifelian stage. daSilva, A-C., Whalen, M. T., Hladil, J., Chadimova, L., Chen, D., Spassov, S., Boulvain, F. & Devleeschouwer, X. (eds). Magnetic susceptibility application: a window onto ancient environments and climatic variation. The Geological Society of London Special Publications, 414, 209-223: doi:org/10.1144/SP414.4.

Minzoni, M., Lehrmann, D.J., Dezoeten, E., Enos, P., Montgomery, P., Berry, A., Qin, Y., Meiyi, Y., Ellwood, B.B., Payne, J.L., 2015. Drowning of the Triassic Yangtze platform, South China, by tectonic subsidence into toxic deep waters of an anoxic basin, Journal of Sedimentary Research, 85, 419-444: doi:10.2110/jrs2015.32

Railsback, L.B., Brook, G.A., Ellwood, B.B., Liang, F., Cheng, H., Edwards, R.L., 2015. A record of wet glacial stages and dry interglacial stages over the last 560 kyr from a standing massive stalagmite in Carlsbad Cavern, New Mexico, USA. Palaeogeography, Palaeoclimatology, Palaeoecology, 438, 256–266.

Nestell, G.P., Nestell, M.K., Ellwood, B.B., Wardlaw, B.R., Basu, A.R., Ghosh, N., Lan, L.T.P., Rowe, H.D., Hunt, A., Tomkin, J.H., Ratcliffe, K.T., 2015. High influx of carbon in walls of agglutinated foraminifers during the Permian-Triassic transition in global oceans. International Geology Review, 57, 411-427: doi:10.1080/00206814.2015.1010610

Keenan, S. and Ellwood, B.B., 2014. Geophysical evaluation of the Richland and Holloway Mmounds, Southeastern Louisiana, U.S.A., Geoarchaeology, 29, 312-325.

Davies, E.J., Ratcliffe, K.T., Montgomery, P., Pomar, L., Ellwood, B.B., and Wray, D.S., 2013. Magnetic susceptibility () stratigraphy and chemostratigraphy applied to an isolated carbonate platform reef complex; Llucmajor Platform, Mallorca. In: Deposits, Architecture and Controls of Carbonate Margin, Slope, and Basin Systems, eds. Verwer, K., Playton, T. and Harris, P., SEPM Special Publication 105, 15 pp., doi:10.2110/sepmsp.105.05.

Ellwood, B.B., Brett, C.E., Tomkin, J.H, MacDonald, W.D., 2013. Visual Identification and Quantification of Milankovitch Climate Cycles in Outcrop: An Example from the Upper Ordovician Kope Formation, Northern Kentucky. In, Jovane, L., Herrero–Bervera, E., Hinnov, L.A., and Housen, B.A. (eds) Magnetic Methods and Timing of Geological Processes. The Geological Society of London Special Publications 2013, 373, p. 341-353,

Ellwood, B.B., Lambert, L.L., TomkinJ.H., Bell, G., Nestell, M.K., Nestell, G.P., Wardlaw, B.R., 2013. Magnetostratigraphy Susceptibility for the Guadalupian Series GSSPs (Middle Permian) in Guadalupe Mountains National Park and Adjacent Areas in West Texas. In, Jovane, L., Herrero–Bervera, E., Hinnov, L.A., and Housen, B.A. (eds) Magnetic Methods and Timing of Geological Processes. The Geological Society of London Special Publications 2013, 373, p. 375-394. doi:10.1144/SP373.1

Ellwood, B.B., Wang, W.–H., Tomkin, J.H., Ratcliffe, K.T., El Hassani, A., Wright, A.M., 2013. Testing high resolution magnetic susceptibility and gamma gradiation methods in the Cenomanian–Turonian (Upper Cretaceous) GSSP and near-by coeval section. Palaeogeography, Palaeoclimatology, Palaeoecology, 378, 75-90.

Algeo, T., Henderson, C.M., Ellwood, B., Rowe, H., Elswick, E., Bates, S., Lyons, T., Hower, J.C., Smith, C., Maynard, B., Hays. L.E., Summons, R.E., Fulton, J., Freeman, K.H., 2012. Evidence for a diachronous Late Permian marine crisis from the Canadian Arctic region. Geological Society of America Bulletin, 124, 1424–1448, doi:10.1130/B30505.1.

Shen, J., Algeo, T.J., Zhou, L., Feng, Q., Yu, J., Ellwood, B.B., 2012. Volcanic perturbations of the marine environment in South China preceding the latest Permian extinction event and their biotic effects. Geobiology,10, 82–103.

Garcia–Alcalde, J.L., Ellwood, B.B., Soto, F., Truyóls–Massoni, M., Tomkin, J.H., 2012. Precise Timing of the Taghanic Biocrisis in the upper Givetian (Middle Devonian) in Northern Spain Using Magnetic Susceptibility Data Sets, Palaeogeography, Palaeoclimatology, Palaeoecology, 313–314, 26–40.

Font, E., Nédélee, A., Ellwood, B.B., Mirão, J., Silva, P.M.F., 2011. A New Sedimentary Benchmark for the Deccan Traps Volcanism? Geophysical Research Letters, 38, L24309, doi:10.1029/2011GL049824.

Balsam, W., Ellwood, B.B., Ji, J., Williams, E.R., Long, X., El Hassani, A., 2011. Magnetic susceptibility as a proxy for rainfall: worldwide data from tropical and temperate climate, Journal of Quaternary Science Reviews, 30, 2732–2744.

Algeo, T.J., Kuwahara, K., Sano, H., Bates, S., Lyons, T., Elswick, E., Hinnov, L., Ellwood, B., Moser, J., and Maynard, J.B., 2011. Spatial variation in sediment fluxes, redox conditions, and productivity in the Permian–Triassic Panthalassic Ocean, Palaeogeography, Palaeoclimatology, Palaeoecology 308, 65–83.

Ellwood, B.B., Tomkin, J.H., El Hassani, A., Bultynck, P., Brett, C.E., Schindler, E., Feist, R., Bartholomew, A., 2011. 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 304, 85–95.

Ellwood, B.B., Algeo, T., El Hassani, A., Tomkin, J.H., Rowe, H., 2011, Defining the Timing and Duration of the Kačák Interval within the Eifelian/Givetian Boundary GSSP, Mech Irdane, Morocco, Using Geochemical and Magnetic Susceptibility Patterns, Palaeogeography, Palaeoclimatology, Palaeoecology 304, 74–84.

Ellwood, B.B., Kafafy, A., Kassab, A., Abdeldayem, A., Obaidalla, N., Howe, R.W., Sikora, P., 2010. 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 94, p. 155–166.

Ellwood, B.B., Kafafy, A., Kassab, A., Tomkin, J.H., Abdeldayem, A., Obaidalla, N., Tandall, K.W., and Thompson, D.E., 2010. 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 94, p. 167–179.

Benedetti, M.M., Haws, J.A., Funk, C.L., Daniels, J.M., Hesp, P.A., Bicho, N.F., Minckley, T.A., Ellwood, B.B., and Forman, S.L., 2010. Late Pleistocene raised beaches of coastal Estremadura, central Portugal, Quaternary Science Reviews, 28, 3428–3447, doi:10.1016/j.quascirev.2009.09.029

Over, D.J., de la Rue, S., Isaacson, P., and Ellwood, B., 2009. Upper Devonian conodonts from black shales of the high latitude Tomachi Formation, Madre de Dios Basin, northern Bolivia. Palaeontographica Americana, 62, 89–99.

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.

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).

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.