I-80 exit 244, North on Dubuque Street right on West Overlook Rd.
Follow signs to Coral lake.
First Stop sign, right, Next stop sign, right.

Coralville Lake
Devonian Fossil  Gorge
Visitor Center, Mon. thru Fri. 8 to 4  Weekends, 9 to 4pm  Gorge open
dawn to dusk.
Admission is Free.

Floods of 1993 surged over the emergency spillway and eroded a 15 foot drop in the channel uncovering the original bedrock of Devonian sea floor to give you a look at fossils normally hidden.