The well-studied and relatively unaltered Paleozoic strata of Anticosti Island record the Late Ordovician-Early Silurian glaciation and coeval mass extinction event. Work in the Bergmann Lab has focused on constraining the magnitude and duration of this glacial episode through the use of clumped-isotope thermometry, which has provided robust estimates of seawater temperature independentof δ18Owater and has allowed for estimation of the extent of ice sheets during this interval.


Bergmann, K.D., Finnegan, S., Creel, R., Eiler, John M., Hughes, N.C., Popov, L.E., Fischer, W.W.; A paired apatite and calcite clumped isotope thermometry approach to estimating Cambro-Ordovician seawater temperatures and isotopic composition: Geochimica et Cosmochimica Acta, v. 224, 18-41.

Finnegan, S., Bergmann, K., Eiler, J.M., Jones, D.S., Fike, D.A., Eisenman, I., Hughes, N.C., Tripati, A.K., Fischer, W.W., 2011, The magnitude and duration of Late Ordovician–Early Silurian glaciation, Science, v. 331, p. 903-906.