Table S1: Shallow groundwater salinization of the Niagara Peninsula, Ontario, Canada MathesonEdward J. HamiltonStewart M. KyserKurt 2018 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