Website URL : https://www.ohiohistory.org/visit/museum-and-site-locator/glacial-grooves

Website Title : Glacial Grooves Geological Preserve | Ohio History Connection

Website Description : A National Natural Landmark, 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.

Keywords Used : glacial grooves, Kelley's Island, Marblehead, geological preserves

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