Map of the feedlot site. Insert shows the location of Glacial Ridge National Wildlife Refuge in northwest Minnesota, USA. Dots and triangles indicate the locations of soil and groundwater samples (Table S1), respectively, with narrow gray boxes showing former feedlot pens. The open circle symbol locates US Geological Survey well G-8. Overlay symbol represent current wetland areas. X- and Y-scales are in UTM zone 14 coordinates (NAD83, in meters). DOI: https://doi.org/10.1525/elementa.271.f1