Michigan Rocks!: A Guide to Geologic Sites in the Great Lakes State

Michigan Rocks! guides you to 56 world-class geologic sites scattered from Isle Royale and the Upper Peninsula to Lower Michigan, including Michigan's Thumb, where carvings in sandstone are preserved at Sanilac Petroglyph State Historic Park. Many of the well-chosen sites are two-fers: you get a good look at ancient features in a rock from time immemorial and see the damage wrought on that same rock by recent glacial ice and erosion.

The author's explanations of the geologic processes that formed these features at work, along with photographs, illustrations, and informative figures and maps, make this the perfect field guide of Michigan rocks for amateur and expert geologists alike.