Publications Catalog

Geologic history and description of Sauk County, the home of Devils Lake and Parfreys Glen. Includes four-color bedrock map and cross sections. Map and cross sections are folded.

Devils Lake State Park is a place of striking geologic contrasts, where some of the oldest rock exposed in southern Wisconsin lies next to some of the youngest geologic materials in the state. The purple rock (called Baraboo quartzite) in the walls of Devils Lake gorge is more than 1.7 billion years old; the glacially deposited ridges that block both ends...