Geology

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The sedimentary rocks of the bluffs are much older than the Ice Age valley.

prairie du chien wisconsin arthur mullen raven beauty chicago trees nature effigy mounds mississippi river views 3rdarm

They were deposited under ancient seas which covered this area over 450 million years ago.

prairie du chien wisconsin arthur mullen raven beauty chicago trees nature effigy mounds mississippi river views 3rdarm

Remains of shellfish which lived in these waters became fossils as the layers slowly turned to stone.

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