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Theodore R. Them

Assistant Professor

Address: SSMB 212
Phone: 843-953-7852


Florida State University & National High Magnetic Field Laboratory, Tallahassee, FL
Arts and Sciences Postdoctoral Fellow, 2016-2018

Virginia Tech, Blacksburg, VA
Ph.D., Geosciences, 2016

Texas A&M University, College Station, TX
M.S., Oceanography, 2012

Shippensburg University of Pennsylvania, Shippensburg, PA
B.S., Geoenvironmental Studies, 2008

Research Interests

  • Sedimentary Geochemistry, Paleoceanography, Global Environmental Destabilization
  • Geochemistry of Phanerozoic sedimentary environments (last ~540 million years)
  • Mass extinctions and other biological crises
  • Geochemistry of Ancient and Modern Environmental Systems (GAMES) Laboratory 
    • Undergraduate and graduate students will generate mercury (Hg) geochemical data from marine and terrestrial sediments as well as sedimentary rocks in order to (i) quantify the mass balance and sources and sinks of Hg in the modern environment, (ii) interpret ancient sedimentary Hg records, (iii) track the cycling of Hg during the Phanerozoic, and (iv) identify and characterize modern environments that contain large quantities of this highly toxic pollutant/contaminant in the southeastern United States.
    • Fieldwork represents a significant and necessary part of the GAMES Lab and select students will take part in these expeditions related to the description and collection of geologic materials. Some students will also have the opportunity travel to other collaborators’ institutions to gain vital laboratory experience while preparing for graduate school or the workforce.

Courses Taught

GEOL 105 Earth History

GEOL 288 Global Change: A Geologic Perspective

GEOL 395 Mercury in Environment


*Students coauthors


8. Them, T.R. II, Jagoe, C.H., Caruthers, A.H., Gill, B.C., Grasby, S.E., Gröcke, D.R., Yin, R., Owens, J.D., 2019, Terrestrial sources as the primary delivery mechanism of mercury to the oceans across the Toarcian Oceanic Anoxic Event (Early Jurassic), Earth and Planetary Science Letters, 507, 62 – 72.


8. Owens, J.D. and Them, T.R. II. (2018, November 13). Volcanit eruptions once caused mass extinctions in the oceans - could climate change do the same? The Conversation. Retrieved from

7. Them, T.R. II, Gill, B.C., Caruthers, A.H., Gerhardt, A.M., Gröcke, D.R., Lyons, T.W., *Marroquín, S.M., Nielsen, S.G., Trabucho Alexandre, J.P., Owens, J.D., 2018, Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction, Proceedings of the National Academy of Sciences, 115 (26), 6596 – 6601.

6. Caruthers, A.H., Smith, P.L., Gröcke, D.R., Gill, B.C., Them II, T.R., Trabucho Alexandre, J., 2018, Ammonites of the Pliensbachian-Toarcian (Jurassic) transition, west-central Nevada, USA, Bulletins of American Paleontology, No. 393, 84 pp.


5. Them, T.R. II, Gill, B.C., Selby, D., Gröcke, D.R., Friedman, R.M., Owens, J.D., 2017, Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event, Scientific Reports, 7:5003.

4. Martindale, R.C., Them, T.R. II, Gill, B.C., *Marroquín, S.M., Knoll, A.H., 2017, A new Early Jurassic fossil Lagerstätte from Ya Ha Tinda, Canada (~183 Ma), Geology, 45, 255 – 258.

3. Them, T.R. II, Gill, B.C., Caruthers, A.H., Gröcke, D.R., *Tulsky, E.T., Martindale, R.C., Poulton, T.P., Smith, P.L., 2017, High-resolution carbon isotope records of the Toarcian Oceanic Anoxic Event (Early Jurassic) from North America and implications for the global drivers of the Toarcian carbon cycle, Earth and Planetary Science Letters, 459, 118 – 126.


2. Them, T.R. II, Schmidt, M.W., and Lynch-Stieglitz, J., 2015, Millennial-scale tropical atmospheric and Atlantic Ocean circulation change from the Last Glacial Maximum and Marine Isotope Stage 3, Earth and Planetary Science Letters, 427, 47 – 56.


1. Schmidt, M.W., Chang, P., Hertzberg, J.E., Them II, T.R., Ji, L., and Otto-Bliesner, B.L., 2012, Impact of abrupt deglacial climate change on tropical Atlantic subsurface temperatures, Proceedings of the National Academy of Sciences, 109 (36), 14348 – 14352.