chatter mark

noun

1. a mark left by a tool that has been chattering.
2. Geology. any of a series of irregular gouges made on rock surfaces by the slipping of rock fragments held in the lower portion of a glacier.

noun

1. any of a series of grooves, pits, and scratches on the surface of a rock, usually made by the movement of a glacier
2. another name for chatter (def. 8)