Glacial striation  From Wikipedia, the free encyclopedia
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search Glacial striations at Mount Rainier National Park Glacial
grooves stemming from the Wisconsin glaciation at Kelleys
Island, Ohio  Glacial striations are scratches or gouges cut
into bedrock by glacial abrasion.These scratches and gouges were
first recognized as the result of a moving glacier in the late
1700s when Swiss alpinists first associated them with moving
glaciers. They also noted that if they were visible today that
the glaciers must also be receding.[1]  Glacial striations are
usually multiple, straight, and parallel, representing the
movement of the glacier using rock fragments and sand grains,
embedded in the base of the glacier, as cutting tools. Large
amounts of coarse gravel and boulders carried along underneath
the glacier provide the abrasive power to cut trough-like
glacial grooves. Finer sediments also in the base of the moving
glacier further scour and polish the bedr