Block diagram of the simplified geologic and topographic structure of the Driftless Area (Upper Mississippi River Valley, USA). See map below for location.
This diagram was created as a visual aid to understanding the regional context of the 2025 Driftless Spring Survey Project. See project website for more details: https://arcg.is/1CLK5r
Simplified bedrock geology of the Driftless Area.
Boundaries from Carson et al. (2023). Bedrock geology compiled from state & county geologic maps. Basemap: Esri Terrain - Slope layer.