US Army Corps of Engineers
Rock Island District Website


Devonian Fossil Gorge

Imagine walking on a 375 million year old ocean floor! This glimpse into Iowa's geologic past was first exposed during the Floods of 1993 at Coralville Lake, then again more were exposed during the Floods of 2008. The fossils and limestone bedrock of the Devonian Fossil Gorge date back almost 200 million years before the dinosaurs! Read more on the History page.

The Welcome to Devonian Fossil Gorge - A Window into Iowa's Geologic Past brochure is located at the entrance to the fossil area with detailed information of each marker. More brochures are also available at the Visitor Center/Office on the East Side of the Dam.

The Devonian Fossil Gorge Brochure and Map is available showing the markers on the gorge area.

Please keep in mind that the removal of, or damage to the fossils is strictly prohibited and subject to a fine. If you see anyone destroying fossils please notify a park ranger immediately or contact the administration office at (319) 338-3543 ext. 6300 or email Thank you!