Indiana University Bloomington

Lisa M. Pratt

Seth Allen Young

Indiana University Research Associate:
Stable Isotope Biogeochemistry

Office:   MSBII S-422
Phone:   812-865-2912 (lab)
Phone: 812-855-8486 (office)

Educational Background

  • Ph.D. Geological Sciences 2008, The Ohio State University
  • M.Sc. Geological Sciences 2003, The Ohio State University
  • B.Sc. Geology 2000, University of Arkansas at Little Rock


  • 2011-present Research Associate at Indiana University
  • 2008-2010 Postdoctoral Research Fellow at Indiana University
  • 2007-2008 Presidential Fellow at The Ohio State University.
  • 2001-2007 Graduate Teaching Associate at The Ohio State University.

Research Interests

My research interests and focus fall within the fields of isotope biogeochemistry, sedimentology, stratigraphy, paleoceanography, and paleobiology. My research has focused on the linkages of tectonics, oceanography, and climate change to the carbon cycle by looking at strontium, neodymium, and carbon isotopic evolution of Earth's oceans. I am interested in the causes major transitional periods of Earth's climate state that have often been associated with mass extinction events. My research now focuses on the linkages of the geochemical sulfur and carbon cycles throughout Earth's history. One of my current research projects involves mass anomalous fractionation (a.ka. mass independent fractionation) of sulfur isotopes in early Earth history and this record relates to oxidation of the atmosphere and/or thermochemical sulfate reduction pathways. Another research project is on the roles of hydrogen sulfide and subsequent sulfide mineralization in preservation of soft tissues in the geologic record.

My most recent research project is the investigation of the past and present biogeochemical cycles of sulfur at Lake Vida, McMurdo Dry Valleys, Antarctica. I will be using sulfur isotopic compositions of ions in the water column, minerals, and organic matter in the sediment column as sensitive indicators of sulfur utilization by microbes within Lake Vida. Here's a link to the Desert Research Institute's page on the Lake Vida research:

Recent Publications

Bergström, S.M., Schmitz, B., Young, S.A. and Bruton, D.L., 2011 (in press), Lower Katian (Upper Ordovician) δ13C chemostratigraphy, global correlation, and sea-level changes in Baltoscandia. GFF.

Saltzman, M.R., Young, S.A., Kump, L.R., Gill, B.C., Lyons, T.W., Runnegar, B., 2011. A pulse of atmospheric oxygen during the Late Cambrian: Implications for animal Biodiversification. Proceedings of the National Academy of Sciences, 108: 3876-3881. doi:10.1073/pnas.1011836108

Gill, B.C., Lyons, T.W., Young, S.A., Kump, L.R., Knoll, A.H., Saltzman, M.R., 2011. Sulfur isotope evidence for widespread euxinia in the Later Cambrian ocean. Nature, 469:80-83. doi:10.1038/nature09700

Young, S.A., Saltzman, M.R., Ausich, W.I., and Kaljo, D., 2010. Did changes in atmospheric CO2 coincide with latest Ordovician glacial–interglacial cycles?. Palaeogeography, Palaeoclimatology, Palaeoecology, 296: 376-388. doi:10.1016/j.palaeo.2010.02.033

Bergström, S. M., Young, S.A., Schmitz, B. 2010. Katian (Upper Ordovician) δ13C chemostratigraphy and sequence stratigraphy in the United States and Baltoscandia: a regional comparison. Palaeogeography, Palaeoclimatology, Palaeoecology, 296: 217-234. doi:10.1016/j.palaeo.2010.02.035

Gouldey, J.C., Saltzman, M.R., Young, S.A., Kaljo, D., 2010. Strontium and carbon isotope stratigraphy of the Llandovery (Early Silurian): Implications for tectonics and weathering. Palaeogeography, Palaeoclimatology, Palaeoecology, 296: 264-275. doi:10.1016/j.palaeo.2010.05.035

Bergström, S. M., Schmitz, B. Young, S.A., 2010. Bruton, D. L. The δ13C chemostratigraphy of the Upper Ordovician Mjøsa Formation at Furuberget near Hamar, southeastern Norway: Baltic, Trans-Atlantic, and Chinese relations. Norwegian Journal of Geology, 90: 65-78. HERE

Young, S.A., Saltzman, M.R., Foland, K.A., Linder, J.S., Kump, L.R., 2009, A major drop in seawater 87Sr/86Sr during the Middle Ordovician (Darriwilian): Links to volcanism and climate? Geology 37: 951-954. doi: 10.1130/G30152A.1

Young, S.A., Saltzman, M.R., Bergström, S.M., Leslie, S.A., Xu, C., 2008. Paired δ13Ccarb and δ13Corg records of Upper Ordovician (Sandbian–Katian) carbonates in North America and China: Implications for paleoceanographic change. Palaeogeography, Palaeoclimatology, Palaeoecology 270: 166-178. doi:10.1016/j.palaeo.2008.09.006

Goldman, D., Leslie, S.A., Nõlvak, J., Young, S.A., Bergström, S.M., Huff, W.D., 2008. An Ordovician Global Reference Section Recently Selected in Oklahoma. Oklahoma Geology Notes 68, 15-18.

Goldman, D., Leslie, S.A., Nõlvak, J., Young, S.A., Bergström, S.M., Huff, W.D., 2007. The Global Stratotype Section and Point (GSSP) for the base of the Katian Stage of the Upper Ordovician Series at Black Knob Ridge, Southeastern Oklahoma, USA. Episodes 30, 258-270.

Bergström, S. M., Young, S.A., Schmitz, and Saltzman, M.R., 2007. Upper Ordovician δ13C chemostratigraphy: A trans-Atlantic comparison. Acta Palaeontologica Sinica 46: 37-39.

Young, S.A., Saltzman, M.R., Bergström, S.M., 2005. Upper Ordovician (Mohawkian) carbon isotope (δ13C) stratigraphy in eastern and central North America: Regional expression a perturbation of the global carbon cycle. Palaeogeography, Palaeoclimatology, Palaeoecology 222: 53-76. doi:10.1016/j.palaeo.2005.03.008

Saltzman, M.R., Young, S.A., 2005. Long-lived glaciation in the Late Ordovician? Isotopic and sequence-stratigraphic evidence from western Laurentia. Geology 33 (2): 109-112. doi: 10.1130/G21219.1