Explore the fragile nature and awesome beauty of Driftless Region flora, fawna, and geology in this stunning poster created by local photographic artist Rick LaMartina. Addtional photos were provided by Tom Schultz, Dennis Malueg, and Maggie Jones. It measures 22 by 28 inches and proceeds benefit the Crawford Stewardship Project. Some 10,000 years ago, grinding glaciers retreated from the upper Midwest filling in and flattening out most of the landscape, except for the Driftless Region centered in Southwestern Wisconsin. Underlying rock is called Karst, a type of limestone or dolomite bedrock that has been made permeable by the action of acidic rainwater. Over thousands of years, the slow erosion has produced a complex network of channels, caves, tunnels, shafts, and other features.