List of fossiliferous stratigraphic units in Wisconsin

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Fossil-bearing stratigraphic units in Wisconsin

Wisconsin has many rock layers that preserve fossils. These layers, called fossiliferous stratigraphic units, are organized into formations, members, and groups. This article provides a concise list of the units in Wisconsin where fossils have been found. For each unit, you’ll usually see its name, an approximate age, and the types of fossils that occur there.

Why it matters: These units help scientists understand Wisconsin’s ancient environments and how life changed over time.

Note: The list is not exhaustive and may be updated as new discoveries are made.