Timothy Gallagher photo

Timothy Gallagher

Assistant Professor
Office Location:
Room 228 McGilvrey Hall
Office Hours:
Tuesday and Thursday 9:00 - 11:30 am.
Contact Information


I am a biogeochemist and sedimentary geologist whose research centers on terrestrial environments, with a particular focus on modern soils and paleosols (fossil soils). I employ a combined observational and experimental approach that incorporates physical, elemental, and isotopic data collected in the field and laboratory. The ultimate goal of my research is to understand how terrestrial environments will respond to anthropogenic-driven climate change and how they have changed throughout Earth History.


Ph.D. University of Michigan, M.S. University of Michigan, B. Phil. University of Pittsburgh, B.A. University of Pittsburgh


Soils, paleosols, stable isotopes, carbon cycle, gas analyses, paleoclimate


  • Gallagher, T.M. and Breecker, D. O, ‘The obscuring effects of calcite dissolution and formation on quantifying soil respiration,’ In-Review at Global Biogeochemical Cycles
  • Kelson, J.R., Huntington, K.W., Breecker, D.O., Burgener, L.K., Gallagher, T.M., Hoke, G.,D. Petersen, S.V., (2020) ‘A proxy for all seasons? A synthesis of clumped isotope data from Holocene soil carbonates,’ In-Review at Quaternary Science Reviews, v. 2
  • Gallagher, T.M., et. al., (2019) ‘Interpreting the difference in magnitudes of PETM ... and organic matter: Oxidation of methane in soils versus elevated soil respiration rates,’ Paleoceanography and Paleoclimatology, v. 34, p. 2113-2128.
  • Gallagher, T. M., Hren, M.T., and Sheldon, N.D., (2019) ‘The effect of soil temperature seasonality on climate reconstructions from paleosols,’ American Journal of Science, v. 319, p. 549-581.
  • Rico, K.I., Sheldon, N.D., Gallagher, T.M., and Chappaz, A. (2019) ‘Redox chemistry and molybdenum burial in a Mesoproterozoic lake,’ Geophysical Research Letters. v. 46, p. 5871-5878.
  • Nordberg, K., Polovodova, I., Gallagher, T.M., and Robijn, A., (2017) ‘Recent oxygen depletion and benthic faunal change in shallow areas of Sannäs Fjord, Swedish west coast,’ Journal of Sea Research. v. 127, p. 46-62.
  • Gallagher, T.M., Sheldon, N.D., Mauk, J.L., Petersen, S.V. Guneli, N., and Brocks, J., (2017) ‘Constraining the thermal history of the Midcontinent Rift System using carbonate clumped isotopes and organic thermal maturity indices,’ Precambrian Research. v
  • Gallagher, T.M. and Sheldon, N.D., (2016) ‘Combining clumped isotopes and soil water balance to understand the nature and timing of pedogenic carbonate formation,’ Chemical Geology, v. 435, p. 79-91
  • Cotton, J.M., Sheldon, N.D., Hren, M.T., Gallagher, T.M., (2015) ‘Positive feedback drives carbon release from soils to atmosphere during Paleocene/Eocene warming,’ American Journal of Science, v. 315, p. 337-361
  • Gallagher, T.M. and Sheldon, N.D., (2013) ‘A new paleothermometer for forest paleosols and its implications for Cenozoic climate,’ Geology, v. 41, p. 647-650.