When river conditions are low, enormous exposed limestone beds reveal fossils from a Devonian sea that covered the region roughly 390 million years ago. The state park protects one of the world's largest exposed Devonian fossil beds and provides a visitor center overlooking the site.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: in.gov/dnr/state-parks/parks-lakes/falls-of-the-ohio-state-park/