Figure F10. Conventions used for measuring azimuths and dips of structural features in the core, and techniques used for measuring structural planes in three dimensions in the core reference frame. A. Working half of the core showing the conventions used for indicating east (090°), west (270°), and south (180°). B. Sketch of the archive half of the core showing the conventions used for measuring the dip of a structure on the face of the split core. C. Sketch of the core showing the conventions used for measuring the dip of a structure at a right angle to the split core face.