Glacial Grooves Geological Preserve

The Glacial Grooves on the north side of Kelleys Island are the largest easily accessible such grooves in the world. They were scoured into solid limestone bedrock about 18,000 years ago by the great ice sheet which covered part of North America. A trough 400-feet long, 35-feet wide, and up to 10-feet deep remains today. The ice, probably hundreds of feet thick, flowed from the north in what is now the Lake Erie basin. The Devonian limestone containing the grooves contains marine fossils that are 350 to 400 million years old. Many other grooves were quarried away during the last century.

Fencing now protects this National Natural Landmark. A walkway and stairs permit visitors a good view of the grooves.

419-746-2546

All daylight hours

4049 East Moores Dock Road
Port Clinton, OH 43452 

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Know Before You Go

Know Before You Go

Key things to do or see when you visit.

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History

History

Explore the Glacial Grooves' significance to Ohio History.

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Local Management

Local Management

The Glacial Grooves is locally managed by ODNR - Lake Erie Islands State Park

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Interesting Facts

Interesting Facts

Learn more about the site.

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Collections

Collections

Discover some of the amazing collections at Glacial Grooves.

Historic Buildings and Resources

Historic Buildings and Resources

Documentation of the Glacial Grooves' historic structures.