The geologic map of the Ferryville and Lansing 7.5-minute quadrangles (Crawford County), located in the Driftless Area of southwestern Wisconsin, provides new observations and lithologic descriptions of the area’s geology. This work supports the Wisconsin Department of Transportation’s ongoing efforts to mitigate slope failures along the Wisconsin State Highway 35 corridor, which runs adjacent to the Mississippi River. Further, this work supplements ongoing efforts by the WGNHS to understand the hydrogeologic framework of the region.