Table S1: Shallow groundwater salinization of the Niagara Peninsula, Ontario, Canada Edward J. Matheson Stewart M. Hamilton Kurt Kyser 10.6084/m9.figshare.5924746.v1 https://geolsoc.figshare.com/articles/journal_contribution/Table_S1_Shallow_groundwater_salinization_of_the_Niagara_Peninsula_Ontario_Canada/5924746 Table S2: Measured δ<sup>34</sup>S<sub>SO4</sub> values. The data collection methodology is present in section 'Laboratory Analysis'. Sample IDs are the same as initiation sampling by Hamilton <i>et al.</i> (2011), see Hamilton (2015) for complete geochemical datasets 2018-02-26 11:50:43 Ontario Laboratory salinization 4 values δ 34 S section Shallow IDs Hamilton Analysis data collection methodology Niagara Peninsula dataset initiation sampling Sample groundwater geochemical Geology