"Chisel marks" on columnar joint face

• Other Authors: Wojtal, Steven F.
• Format: Other/Unknown Material
• Language: unknown
• Published: Oberlin College Library 1997
• Subjects: Geology; Structural; Joints (Geology); Columnar joints; Austurland; Skaftafell; Iceland
• Online Access: http://server15963.contentdm.oclc.org/u?/p15963coll1,1697

The sides of any columns in columnar jointing do not form a single uniform fracture, rather they grow incrementally. Each subhorizontal fracture increment, known as a "chisel mark," has its own fracture surface markings that indicate the direction of growth of that fracture. Most fractures...