chatter mark
- a mark left by a tool that chatters
- any mark or scratch on a rock surface caused by a large, heavy mass, esp. a glacier, sliding over it
See chatter mark in American Heritage Dictionary 4
also chat·ter·mark (chătˈər-märkˌ)
noun- A riblike marking on wood or metal, caused by vibration of a cutting tool.
- Geology One of a series of short scars made by glacial drift on a surface of bedrock.
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