Some of the oldest rocks in the world are located in Minnesota. Discover caves and glaciers, a network of buried river channels underlying the Twin Cities, and ancient lava flows at Taylor's Falls in this complete guide to the state's outstanding geological areas.

Constance Jefferson Sansome spent a year with her family traveling throughout Minnesota to bring you this unique book. Written for both the geologist and the layman, it is the ideal companion to wildflower, tree and bird guides. Detailed maps and descriptions of 57 of Minnesota's most outstanding geologic features are provided to help you explore our state to the fullest. Designed to be packed in the car with field glasses, hiking shoes and camera, Minnesota Underfoot will travel with you from Split Rock to Pipestone National Monument.