Supplemental Material: Major ion pore-water chemistry evolution in Lake Michigan benthic sediments: Evidence for direct input from Michigan Basin saline groundwater

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<p>Detailed information on locations (Table S1) and sediment descriptions (Table S2) of the 1999 sediment gravity cores, overviews of major cation pore-water chemistry analysis procedures and quality assurance/quality control protocols (Tables S3 and S4), and additional information on sources and modifications to the generalized regional bedrock geology compilation (Table S5); figures depicting calcium versus sodium variations in pore-water samples (Fig. S1) and depicting sediment descriptions and corresponding changes in pore-water sodium concentrations (Fig. S2); and data tables of pore-water composition analyses (chloride, bromide, and major cations) for the Lake Michigan (Data S1 and S2) and Saginaw Bay (Lake Huron) (Data S3) samples presented in the paper. </p>