Quantitative susceptibility mapping (QSM) can reflect the iron and myelin concentration within human brain tissue. Ex vivo MRI can allow us to study the cortical laminar structure at high-resolution. Here we conduct a study to combine the two, that is to analyze QSM maps of an ex vivo human brain cortex at 500um and 150um resolution. Our analysis shows matching global patterns of positive susceptibility at the gray-white boundary for both resolutions that were validated with iron-stain on a tissue-block. We find visual cortex, and localized regions of parietal and frontal lobe to contain the highest concentration of positive susceptibility.