Floodwaters in 1993 and 2008 stripped away soil below Coralville Lake and exposed a broad pavement of roughly 375-million-year-old Devonian fossils. Visitors can walk through the ancient seafloor and see corals and marine remains in place.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: mvr.usace.army.mil/Missions/Recreation/Coralville-Lake/