This book describes 56 different geological sites, scattered all over Minnesota, where you can scramble around, looking at geological features. It uses USGS maps and black and white photos to show you exactly where to go. Plus, there are line drawings, tables and interesting, accurate verbal infomation about the geology of each of these sites.
If you plan to visit Minnesota or live there, and you like the outdoors, it's well worth owning this book, as well as Guide to the Superior Trail, Hiking Minnesota, and Isle Royale National Park: Foot Trails and Water Routes.