Kelley's Island Grooves, Ohio

The grooves on Kelley's Island have been the source of debate for over 100 years. Some say they were cut by glacier ice, others say by jets of subglacial water. Note the curved forms suggesting fluid flow. The smaller grooves lie inside a larger one framed by the fence. You are looking in the direction that the glacier flowed. Note the texture line about 1/2 way up the grooves. Above this line the limestone bedrock is more weathered than below the line because till was more recently removed, exposing the grooves. See an example from Hargreaves Glacier.

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