JOINTS I. JOINTS vs. FAULTS A. Joints - fractures with no significant displacement B. Faults - fractures with significant displacement II. FEATURES OF JOINTS A. Joint surface 1. "Plumose structures" 2. "Hackle marks" B. Joint sets 1. Parallel joints 2. Vertical C. Joint system 1. Several sets III. CLASSES OF JOINTS A. Mode I: Opening B. Mode II. Sliding C. Mode III. Scissoring IV. STATISTICAL ANALYSIS OF JOINTS A. Histogram B. Rose diagram C. Stereonet V. TYPES OF JOINTS A. Bedding parallel (foliation parallel) B. Related to folds C. Exfoliation joints 1. Massive Homogenous rocks (granite) D. Columnar joints