Assessing the influence of diagenetic processes on iron and manganese geochemistry in anoxic sedimentary settings: Implications for the paleo-redox proxies

Data S1 includes major cation data for the water column of the Middle Island Sinkhole (MIS; Lake Huron). Data S2 includes major cation data for the porewaters of two cores from MIS. Data S3 includes Fe, Mn, and Al data for two sediment cores in MIS. Data S4 includes normalized Fe K-edge XANES spectra for standards, and samples from the Cretaceous Niobrara Formation.