The geologic map of the Stitzer and western part of the Montfort quadrangles includes 1:24,000-scale mapping of both surficial and bedrock geology. This area occurs at the northern margin of the historic Upper Mississippi Valley lead and zinc mining district. Paleozoic strata are folded into a regionally-significant anticline, and mapping was initiated to investigate the possible release of groundwater contaminants such as arsenic into the groundwater. Dataset 1 provides the geologic map data in the geologic map schema (GeMS) format.