Geology and Landscape of Michigan’s Pictured Rocks National Lakeshore and Vicinity
Publication Year: 2012
Published by: Wayne State University Press
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This book was a long time coming. It began in 1994 with the writing of a Pictured Rocks Resource Report on the park’s glacial geology, followed by a more ambitious report on ancient shorelines written as a “geoscientist-in- the-park” during my...
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Immeasurable thanks are due to Gregg Bruff, chief of Heritage Education at Pictured Rocks National Lakeshore, who provided the initial inspiration for this book and shared access to innumerable National Park Service photographs and related documents. Likewise, Dr. Walt Loope...
1. Introduction and Regional Setting
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Pictured Rocks National Lakeshore preserves one of the most exquisite freshwater coastal landscapes in North America. Here, nearly five hundred miles from the nearest ocean, lies a lonely, 40-mile swath of jagged coastline to rival any New England travel...
2. Precambrian and Paleozoic Bedrock
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Systematic scientific study of the Lake Superior sandstones, which make up the Pictured Rocks, begins with the work of Douglass Houghton (1841), Michigan’s first state geologist. Later, J. W. Foster and J. D. Whitney (1851), cruising the Lake Superior shoreline...
3. Ancient Lakes and Relict Shorelines
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The idea that Michigan and much of northeastern North America were buried beneath a vast continental ice sheet a mile thick is difficult for most people to imagine. Yet the evidence for continental glaciation, compiled and corroborated by hundreds of scientists over...
4. The Ice Age
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With the coming of the Great Ice Age, the last chapters in the geologic history of Pictured Rocks National Lakeshore begin. Glaciers advancing southward from source regions in eastern Canada destroyed the preexisting landscape as they excavated...
5. The Holocene Epoch
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The Holocene history of Pictured Rocks begins with the final wastage of Marquette ice into the Lake Superior basin approximately 11,000 years ago. As the land emerged from beneath the glaciers, weathering, mass wasting, and erosion began to reshape the landscape, although with limited...
Appendix: Pictured Rocks Road Log
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This road log is designed to take the interested reader to many of the park’s best geologic sites. It begins in Munising and ends 84 miles later in Grand Marais, traversing the park from west to east following paved County Road H-58. A few of the side roads, such as the access road...
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Page Count: 200
Publication Year: 2012