Definitions for "Erratics"
Boulders that are clearly out of place in meadows or on mountaintops. Receding glaciers deposited them.
Boulders carried long distances by the glaciers and deposited when the glacier melted. They tend to be smooth and rounded. Erratics can be found along the entire Ice Age Trail, except where it traverses parts of the Driftless Area. Some of the famous and largest ones along the Trail are in Waukesha, Waupaca and Langlade counties.
Boulders and other rock fragments transported by glacial ice from their place of origin to an area where the bedrock is different.