'Chatter mark' definitions:

Definition of 'chatter mark'

(from WordNet)
noun
Marks on a glaciated rock caused by the movement of a glacier
noun
A mark made by a chattering tool on the surface of a workpiece

Definition of 'Chatter mark'

From: GCIDE
  • Chatter mark \Chat"ter mark`\ (a) (Mach.) One of the fine undulations or ripples which are formed on the surface of work by a cutting tool which chatters. (b) (Geol.) A short crack on a rock surface planed smooth by a glacier. [Webster 1913 Suppl.]