Roll Mark : A term applied to surface imperfections caused by improper roll alignment or roll surface damage. Such imperfections may be periodic or continuous. (Bul 5T1)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}