Ancient saltwater seas once covered what are now sweetwater lakes. The saltwater seas deposited limestone in layers. In the photo you can see how the limestone was formed over time in layer after layer. I took this photo on the Door Peninsula of Wisconsin. It juts out into Lake Michigan in such a way that sailors called it Death's Door due to hazardous conditions. Now it is simply called the Door Peninsula.
Read more about the Great Lakes in my book, The Dynamic Great Lakes
with information about how these lakes were formed and what lies around and under the water.
The book is widely available on the www and in bookstores.
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