Figure F17. Conventions used for measuring azimuths and dips of structural features in core and the techniques adopted for measuring structural planes in three dimensions in the core reference frame. A. Working-half reference frame. B. Archive-half reference frame. C. Clinometer measurements. D. Measurement of true orientation of structural features. Examples of orientation measurements with the protractor-based device are shown (Leg 206, Shipboard Scientific Party, 2003b).
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