Several thing contribute to "hash marks", if the boards are not even or have small cracks between the boards then as the ball skids across then it makes the marks, those that loop the ball or swing it seem to generate more "hash marks" than a down and in player, chips or"pot hole" in the heads also will makemarks as well but generally more pronounced.
Synthetics are smoother, basically like bowling on a formica counter top, leave little or no marks except possibly where the sheets are spliced together.
I bowl in a wood house and they are in need of resurfacing bad, to the point where I throw a different ball every night I bowl to hold down the wear and tear on my equipment, I shoot all my spares with a plastic ball to further reduce the damage to my high end equipment.
