These glacial grooves were formed 25, 000 years ago when the climate was cooler and wetter.
2.
Large amounts of coarse gravel and boulders carried along underneath the glacier provide the abrasive power to cut trough-like " glacial grooves ".
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On the northwest side, for example, 396-foot-long, 30-foot wide glacial grooves illustrate the raw power of the geological forces of the ice age.
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The glacial striations puts Kelleys in mild fame as inside are the largest and most easily accessible remains of glacial grooves in the world.
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On the northern side, Kelleys Island State Park offers camping and protects the Glacial Grooves State Memorial and the North Shore Alvar State Nature Preserve.
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Intense glaciation has taken place at Level Mountain in the last 5.33 million years, as shown by the presence of strongly developed glacial grooves reaching elevations over } }.
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Hubans and Gunn don't know where it is until they see a flat, smooth surface that at first appears to be a glacial groove carved into the lake's bottom.
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Four miles into Lake Erie is Kelleys Island, which includes Glacial Grooves _ ancient hieroglyphics carved in rock by the Erie Indians _ and hiking, boating and a tram tour of the island.
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Other historic attractions _ the oldest continuously operating lighthouse on the Great Lakes in Marblehead, mysterious mansions and shipwrecks galore _ complement such natural wonders as huge underground caves and ancient glacial grooves.
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An outstanding example of glacial grooves can be found at the Glacial Grooves at Kelleys Island, Ohio ( a National Natural Landmark ), the most impressive of which is long, wide, and up to deep.
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