Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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