chatter mark

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A riblike marking on wood or metal, caused by vibration of a cutting tool.
2. n. Geology One of a series of short scars made by glacial drift on a surface of bedrock.

GNU Webster's 1913

1. (Mach.) One of the fine undulations or ripples which are formed on the surface of work by a cutting tool which chatters.
2. (Geol.) A short crack on a rock surface planed smooth by a glacier.

WordNet 3.0

1. n. marks on a glaciated rock caused by the movement of a glacier
2. n. a mark made by a chattering tool on the surface of a workpiece