During the Silurian Period in earth history, 425 million years ago, when much of North America was covered by a shallow, tropical sea, reefs flourished in the area now occupied by Wisconsin and Illinois. This site uses these reefs as a vehicle for students to learn general principles, local details, and environmental significance of the study of the ancient past.
The Silurian reef diorama at the Milwaukee Public Museum, which serves as the focus for the pages that follow.
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